use axum::{
    extract::{Extension, Multipart, Path, Query, State},
    http::StatusCode,
    response::{Html, Json},
    routing::{get, patch, post},
    Router,
};
use serde::{Deserialize, Serialize};
use sqlx::Row;
use std::process::Command;

use crate::core::db::ResourceRecord;

pub fn identity_routes() -> Router<crate::api::types::AppState> {
    Router::new()
        .route("/api/v1/files", get(list_files))
        .route("/api/v1/file/:file_uuid", get(get_file_detail))
        .route(
            "/api/v1/file/:file_uuid/identities",
            get(get_file_identities),
        )
        .route(
            "/api/v1/identity/:identity_uuid",
            get(get_identity_detail)
                .delete(delete_identity)
                .patch(update_identity),
        )
        .route(
            "/api/v1/identity/:identity_uuid/files",
            get(get_identity_files),
        )
        .route(
            "/api/v1/identity/:identity_uuid/chunks",
            get(get_identity_chunks),
        )
        .route(
            "/api/v1/identity/:identity_uuid/faces",
            get(get_identity_faces),
        )
        .route("/api/v1/file/:file_uuid/faces", get(get_file_faces))
        .route("/api/v1/resource/register", post(register_resource))
        .route("/api/v1/resource/heartbeat", post(heartbeat_resource))
        .route("/api/v1/resources", get(list_resources))
        .route("/api/v1/identity/upload", post(upload_identity))
        .route(
            "/api/v1/identity/:identity_uuid/profile-image",
            post(upload_profile_image).get(get_profile_image),
        )
        .route(
            "/api/v1/identity/:identity_uuid/profile-image/from-face",
            post(set_profile_from_face),
        )
        .route(
            "/api/v1/identity/:identity_uuid/status",
            get(get_identity_status),
        )
        .route(
            "/api/v1/identity/:identity_uuid/json",
            get(get_identity_json),
        )
        // Experiment: identity text search (non-polluting, separate endpoint)
        .route("/api/v1/search/identity_text", get(search_identity_text))
        .route("/api/v1/identities/search", get(search_identities_by_text))
        // Undo/Redo/History
        .route("/api/v1/identity/:identity_uuid/undo", post(undo_identity))
        .route("/api/v1/identity/:identity_uuid/redo", post(redo_identity))
        .route(
            "/api/v1/identity/:identity_uuid/history",
            get(get_identity_history),
        )
}

// --- Files Endpoints ---

#[derive(Debug, Deserialize)]
pub struct FilesQuery {
    pub page: Option<usize>,
    pub page_size: Option<usize>,
    pub status: Option<String>,
    pub file_uuid: Option<String>,
}

async fn list_files(
    State(state): State<crate::api::types::AppState>,
    Query(params): Query<FilesQuery>,
) -> Result<Json<FilesResponse>, (StatusCode, String)> {
    let page = params.page.unwrap_or(1);
    let page_size = params.page_size.unwrap_or(20);

    // If UUID is provided, fetch that specific file and return it as a list item
    if let Some(ref file_uuid) = params.file_uuid {
        let video = state
            .db
            .get_video_by_uuid(file_uuid)
            .await
            .map_err(|e| (StatusCode::INTERNAL_SERVER_ERROR, e.to_string()))?;

        let data = if let Some(v) = video {
            vec![FileItem {
                file_uuid: v.file_uuid,
                file_name: v.file_name,
                file_path: v.file_path,
                status: v.status.as_str().to_string(),
            }]
        } else {
            vec![]
        };

        return Ok(Json(FilesResponse {
            success: true,
            total: data.len() as i64,
            page,
            page_size,
            data,
        }));
    }

    // Default: List files with pagination
    let offset = ((page - 1) as i64) * (page_size as i64);

    let records = state
        .db
        .list_videos(page_size as i32, offset)
        .await
        .map_err(|e| (StatusCode::INTERNAL_SERVER_ERROR, e.to_string()))?;

    let data = records
        .0
        .into_iter()
        .map(|r| FileItem {
            file_uuid: r.file_uuid,
            file_name: r.file_name,
            file_path: r.file_path,
            status: r.status.as_str().to_string(),
        })
        .collect();

    let total = records.1;

    Ok(Json(FilesResponse {
        success: true,
        total,
        page,
        page_size,
        data,
    }))
}

#[derive(Debug, Serialize)]
pub struct FilesResponse {
    pub success: bool,
    pub total: i64,
    pub page: usize,
    pub page_size: usize,
    pub data: Vec<FileItem>,
}

#[derive(Debug, Serialize)]
pub struct FileItem {
    pub file_uuid: String,
    pub file_name: String,
    pub file_path: String,
    pub status: String,
}

#[derive(Debug, Serialize)]
pub struct FileDetailResponse {
    pub success: bool,
    pub file_uuid: String,
    pub file_name: String,
    pub file_path: String,
    pub status: String,
    pub duration: f64,
    pub fps: f64,
    pub metadata: Option<serde_json::Value>,
    pub created_at: Option<chrono::DateTime<chrono::Utc>>,
}

async fn get_file_detail(
    State(state): State<crate::api::types::AppState>,
    Path(file_uuid): Path<String>,
) -> Result<Json<FileDetailResponse>, (StatusCode, String)> {
    let file = state
        .db
        .get_video_by_uuid(&file_uuid)
        .await
        .map_err(|e| (StatusCode::INTERNAL_SERVER_ERROR, e.to_string()))?;

    match file {
        Some(f) => Ok(Json(FileDetailResponse {
            success: true,
            file_uuid: f.file_uuid,
            file_name: f.file_name,
            file_path: f.file_path,
            status: f.status.as_str().to_string(),
            duration: f.duration,
            fps: f.fps,
            metadata: f.probe_json,
            created_at: chrono::DateTime::parse_from_rfc3339(&f.created_at)
                .ok()
                .map(|d| d.into()),
        })),
        None => Err((
            StatusCode::NOT_FOUND,
            format!("File not found: {}", file_uuid),
        )),
    }
}

#[derive(Debug, Serialize)]
pub struct FileIdentitiesResponse {
    pub success: bool,
    pub file_uuid: String,
    pub fps: f64,
    pub total: i64,
    pub page: usize,
    pub page_size: usize,
    pub data: Vec<FileIdentityItem>,
}

#[derive(Debug, Serialize)]
pub struct FileIdentityItem {
    pub identity_id: i32,
    pub identity_uuid: Option<String>,
    pub name: String,
    pub metadata: serde_json::Value,
    pub face_count: Option<i32>,
    pub speaker_count: Option<i32>,
    pub start_frame: Option<i32>,
    pub end_frame: Option<i32>,
    pub start_time: Option<f64>,
    pub end_time: Option<f64>,
    pub confidence: Option<f64>,
}

async fn get_file_identities(
    State(state): State<crate::api::types::AppState>,
    Path(file_uuid): Path<String>,
    Query(params): Query<FilesQuery>,
) -> Result<Json<FileIdentitiesResponse>, (StatusCode, String)> {
    let page = params.page.unwrap_or(1);
    let page_size = params.page_size.unwrap_or(20);
    let offset = ((page - 1) as i64) * (page_size as i64);

    let records = state
        .db
        .get_file_identities(&file_uuid, page_size as i32, offset)
        .await
        .map_err(|e| (StatusCode::INTERNAL_SERVER_ERROR, e.to_string()))?;

    let fps = 25.0;
    let data: Vec<FileIdentityItem> = records
        .into_iter()
        .map(|r| FileIdentityItem {
            identity_id: r.identity_id,
            identity_uuid: r.identity_uuid,
            name: r.name,
            metadata: r.metadata,
            face_count: r.face_count,
            speaker_count: r.speaker_count,
            start_frame: r.start_frame,
            end_frame: r.end_frame,
            start_time: r.start_time,
            end_time: r.end_time,
            confidence: r.confidence,
        })
        .collect();

    let total = match sqlx::query_scalar::<_, i64>(
        &format!(
            "SELECT COUNT(DISTINCT fd.identity_id) FROM {} fd WHERE fd.file_uuid = $1 AND fd.identity_id IS NOT NULL",
            crate::core::db::schema::table_name("face_detections")
        )
    )
    .bind(&file_uuid)
    .fetch_one(state.db.pool())
    .await
    {
        Ok(c) => c,
        Err(_) => data.len() as i64,
    };

    Ok(Json(FileIdentitiesResponse {
        success: true,
        file_uuid: file_uuid,
        fps,
        total,
        page,
        page_size,
        data,
    }))
}

#[derive(Debug, Serialize)]
pub struct IdentityDetailResponse {
    pub success: bool,
    pub identity_uuid: String,
    pub name: String,
    pub identity_type: Option<String>,
    pub source: Option<String>,
    pub status: Option<String>,
    pub metadata: serde_json::Value,
    pub reference_data: serde_json::Value,
    pub tmdb_id: Option<i32>,
    pub tmdb_profile: Option<String>,
    pub created_at: Option<chrono::DateTime<chrono::Utc>>,
    pub updated_at: Option<chrono::DateTime<chrono::Utc>>,
}

#[derive(Debug, Serialize)]
pub struct IdentityStatusResponse {
    pub success: bool,
    pub identity_uuid: String,
    pub name: String,
    pub has_json: bool,
    pub has_jpg: bool,
    pub error: Option<String>,
}

fn strip_uuid(u: &uuid::Uuid) -> String {
    u.to_string().replace('-', "")
}

async fn get_identity_detail(
    State(state): State<crate::api::types::AppState>,
    Path(identity_uuid): Path<String>,
) -> Result<Json<IdentityDetailResponse>, (StatusCode, String)> {
    let uuid_clean = identity_uuid.replace('-', "");

    let identity = state
        .db
        .get_identity_by_uuid(&uuid_clean)
        .await
        .map_err(|e| (StatusCode::INTERNAL_SERVER_ERROR, e.to_string()))?;

    match identity {
        Some(i) => Ok(Json(IdentityDetailResponse {
            success: true,
            identity_uuid: i.uuid.clone(),
            name: i.name,
            identity_type: i.identity_type,
            source: i.source,
            status: i.status,
            metadata: i.metadata,
            reference_data: i.reference_data,
            tmdb_id: i.tmdb_id,
            tmdb_profile: Some(format!(
                "{}/identities/{}/profile.jpg",
                crate::core::config::OUTPUT_DIR.as_str(),
                i.uuid.replace('-', "")
            )),
            created_at: i.created_at,
            updated_at: i.updated_at,
        })),
        None => Err((
            StatusCode::NOT_FOUND,
            format!("Identity not found: {}", uuid_clean),
        )),
    }
}

async fn get_identity_status(
    State(state): State<crate::api::types::AppState>,
    Path(identity_uuid): Path<String>,
) -> Result<Json<IdentityStatusResponse>, (StatusCode, String)> {
    let uuid_clean = identity_uuid.replace('-', "");

    let identity = state
        .db
        .get_identity_by_uuid(&uuid_clean)
        .await
        .map_err(|e| (StatusCode::INTERNAL_SERVER_ERROR, e.to_string()))?;

    match identity {
        Some(i) => {
            // Check both UUID formats (with and without hyphens)
            let dir_nohyphen = crate::core::identity::storage::identity_dir(&uuid_clean);
            let uuid_hyphen = i.uuid.clone();
            let dir_hyphen = crate::core::identity::storage::identity_dir(&uuid_hyphen);
            let has_json = dir_nohyphen.join("identity.json").exists()
                || dir_hyphen.join("identity.json").exists();
            let has_jpg = dir_nohyphen.join("profile.jpg").exists()
                || dir_hyphen.join("profile.jpg").exists();
            Ok(Json(IdentityStatusResponse {
                success: true,
                identity_uuid: i.uuid.clone(),
                name: i.name,
                has_json,
                has_jpg,
                error: None,
            }))
        }
        None => Err((
            StatusCode::NOT_FOUND,
            format!("Identity not found: {}", uuid_clean),
        )),
    }
}

#[derive(Debug, Serialize)]
pub struct IdentityFilesResponse {
    pub success: bool,
    pub identity_uuid: String,
    pub name: String,
    pub total: i64,
    pub page: usize,
    pub page_size: usize,
    pub data: Vec<IdentityFileItem>,
}

async fn delete_identity(
    State(state): State<crate::api::types::AppState>,
    Extension(auth): Extension<crate::api::middleware::UserAuth>,
    Path(identity_uuid): Path<String>,
) -> Result<StatusCode, StatusCode> {
    let table = crate::core::db::schema::table_name("face_detections");
    let id_table = crate::core::db::schema::table_name("identities");
    let history_table = crate::core::db::schema::table_name("identity_history");

    let uuid_clean = identity_uuid.replace('-', "");

    // Get identity_id + full snapshot before deletion
    let row: Option<(i32, serde_json::Value)> = sqlx::query_as(&format!(
        "SELECT id, jsonb_build_object('id', id, 'uuid', uuid::text, 'name', name, 'identity_type', identity_type, 'source', source, 'status', status, 'metadata', metadata, 'tmdb_id', tmdb_id, 'tmdb_profile', tmdb_profile) FROM {} WHERE replace(uuid::text, '-', '') = $1",
        id_table
    ))
    .bind(&uuid_clean)
    .fetch_optional(state.db.pool())
    .await
    .map_err(|_| StatusCode::INTERNAL_SERVER_ERROR)?;

    let (identity_id, identity_snapshot) = row.ok_or(StatusCode::NOT_FOUND)?;

    // Delete identity file from disk
    let _ = crate::core::identity::storage::delete_identity_file(&uuid_clean);

    // Capture unbound faces before unbinding
    let unbound_faces: Vec<(String, Option<String>, Option<i32>)> = sqlx::query_as(&format!(
        "SELECT file_uuid, face_id, trace_id FROM {} WHERE identity_id = $1",
        table
    ))
    .bind(identity_id)
    .fetch_all(state.db.pool())
    .await
    .map_err(|_| StatusCode::INTERNAL_SERVER_ERROR)?;

    let face_list: Vec<serde_json::Value> = unbound_faces
        .into_iter()
        .map(|(fu, fid, tid)| {
            serde_json::json!({
                "file_uuid": fu,
                "face_id": fid,
                "trace_id": tid
            })
        })
        .collect();

    // Clear delete redo stack (if identity was previously restored via undo)
    let _ = sqlx::query(&format!(
        "DELETE FROM {} WHERE identity_id = $1 AND operation = 'delete' AND is_undone = true",
        history_table
    ))
    .bind(identity_id)
    .execute(state.db.pool())
    .await;

    // Insert delete history record
    let uid = auth.user_id.to_string();
    let usrc = match auth.source {
        crate::api::middleware::AuthSource::Jwt => "jwt",
        crate::api::middleware::AuthSource::Session => "session",
        crate::api::middleware::AuthSource::ApiKey => "api_key",
    };
    let before_snapshot = serde_json::json!({
        "identity": identity_snapshot,
        "unbound_faces": face_list,
    });
    let after_snapshot = serde_json::json!({});
    let _ = sqlx::query(&format!(
        "INSERT INTO {} (identity_id, operation, before_snapshot, after_snapshot, is_undone, user_id, user_source) VALUES ($1, 'delete', $2, $3, false, $4, $5)",
        history_table
    ))
    .bind(identity_id)
    .bind(before_snapshot)
    .bind(after_snapshot)
    .bind(&uid)
    .bind(usrc)
    .execute(state.db.pool())
    .await;

    // Unbind all faces
    sqlx::query(&format!(
        "UPDATE {} SET identity_id = NULL WHERE identity_id = $1",
        table
    ))
    .bind(identity_id)
    .execute(state.db.pool())
    .await
    .map_err(|_| StatusCode::INTERNAL_SERVER_ERROR)?;

    // Delete identity
    sqlx::query(&format!("DELETE FROM {} WHERE id = $1", id_table))
        .bind(identity_id)
        .execute(state.db.pool())
        .await
        .map_err(|_| StatusCode::INTERNAL_SERVER_ERROR)?;

    Ok(StatusCode::NO_CONTENT)
}

#[derive(Debug, Serialize)]
pub struct IdentityFileItem {
    pub file_uuid: String,
    pub file_name: String,
    pub file_path: String,
    pub status: String,
    pub face_count: Option<i32>,
    pub speaker_count: Option<i32>,
    pub first_appearance: Option<f64>,
    pub last_appearance: Option<f64>,
    pub confidence: Option<f64>,
}

async fn get_identity_files(
    State(state): State<crate::api::types::AppState>,
    Path(identity_uuid): Path<String>,
    Query(params): Query<FilesQuery>,
) -> Result<Json<IdentityFilesResponse>, (StatusCode, String)> {
    let uuid = identity_uuid.replace('-', "");
    let id_table = crate::core::db::schema::table_name("identities");

    let identity: Option<(i32, String)> = sqlx::query_as(&format!(
        "SELECT id, name FROM {} WHERE REPLACE(uuid::text, '-', '') = $1",
        id_table
    ))
    .bind(&uuid)
    .fetch_optional(state.db.pool())
    .await
    .map_err(|e| (StatusCode::INTERNAL_SERVER_ERROR, e.to_string()))?;

    let (identity_id, name) =
        identity.ok_or((StatusCode::NOT_FOUND, "Identity not found".to_string()))?;

    let page = params.page.unwrap_or(1);
    let page_size = params.page_size.unwrap_or(20);
    let offset = ((page - 1) as i64) * (page_size as i64);

    let records = state
        .db
        .get_identity_files(&uuid, page_size as i32, offset)
        .await
        .map_err(|e| (StatusCode::INTERNAL_SERVER_ERROR, e.to_string()))?;

    let data: Vec<IdentityFileItem> = records
        .into_iter()
        .map(|r| IdentityFileItem {
            file_uuid: r.file_uuid,
            file_name: r.file_name,
            file_path: r.file_path,
            status: r.status,
            face_count: r.face_count,
            speaker_count: r.speaker_count,
            first_appearance: r.first_appearance,
            last_appearance: r.last_appearance,
            confidence: r.confidence,
        })
        .collect();

    let total = match sqlx::query_scalar::<_, i64>(&format!(
        "SELECT COUNT(DISTINCT fd.file_uuid) FROM {} fd WHERE fd.identity_id = $1",
        crate::core::db::schema::table_name("face_detections"),
    ))
    .bind(identity_id)
    .fetch_one(state.db.pool())
    .await
    {
        Ok(c) => c,
        Err(_) => data.len() as i64,
    };

    Ok(Json(IdentityFilesResponse {
        success: true,
        identity_uuid: uuid.to_string().replace('-', ""),
        name,
        total,
        page,
        page_size,
        data,
    }))
}

#[derive(Debug, Serialize)]
pub struct IdentityFacesResponse {
    pub success: bool,
    pub identity_uuid: String,
    pub name: String,
    pub total: i64,
    pub page: usize,
    pub page_size: usize,
    pub data: Vec<IdentityFaceItem>,
}

#[derive(Debug, Serialize)]
pub struct IdentityFaceItem {
    pub id: i64,
    pub file_uuid: String,
    pub frame_number: i64,
    pub timestamp_secs: Option<f64>,
    pub face_id: Option<String>,
    pub bbox: BBox,
    pub confidence: f64,
}

#[derive(Debug, Serialize)]
pub struct BBox {
    pub x: f64,
    pub y: f64,
    pub width: f64,
    pub height: f64,
}

async fn get_identity_faces(
    State(state): State<crate::api::types::AppState>,
    Path(identity_uuid): Path<String>,
    Query(params): Query<FilesQuery>,
) -> Result<Json<IdentityFacesResponse>, (StatusCode, String)> {
    let uuid = identity_uuid.replace('-', "");
    let id_table = crate::core::db::schema::table_name("identities");

    let identity: Option<(i32, String)> = sqlx::query_as(&format!(
        "SELECT id, name FROM {} WHERE REPLACE(uuid::text, '-', '') = $1",
        id_table
    ))
    .bind(&uuid)
    .fetch_optional(state.db.pool())
    .await
    .map_err(|e| (StatusCode::INTERNAL_SERVER_ERROR, e.to_string()))?;

    let (identity_id, name) =
        identity.ok_or((StatusCode::NOT_FOUND, "Identity not found".to_string()))?;

    let page = params.page.unwrap_or(1);
    let page_size = params.page_size.unwrap_or(50);
    let offset = ((page - 1) as i64) * (page_size as i64);

    let records = state
        .db
        .get_identity_faces(&uuid, page_size as i32, offset)
        .await
        .map_err(|e| (StatusCode::INTERNAL_SERVER_ERROR, e.to_string()))?;

    let data: Vec<IdentityFaceItem> = records
        .into_iter()
        .map(|r| IdentityFaceItem {
            id: r.id,
            file_uuid: r.file_uuid,
            frame_number: r.frame_number,
            timestamp_secs: r.timestamp_secs,
            face_id: r.face_id,
            bbox: BBox {
                x: r.x,
                y: r.y,
                width: r.width,
                height: r.height,
            },
            confidence: r.confidence,
        })
        .collect();

    let total = match sqlx::query_scalar::<_, i64>(&format!(
        "SELECT COUNT(*) FROM {} fd WHERE fd.identity_id = $1",
        crate::core::db::schema::table_name("face_detections"),
    ))
    .bind(identity_id)
    .fetch_one(state.db.pool())
    .await
    {
        Ok(c) => c,
        Err(_) => data.len() as i64,
    };

    Ok(Json(IdentityFacesResponse {
        success: true,
        identity_uuid: uuid.to_string().replace('-', ""),
        name,
        total,
        page,
        page_size,
        data,
    }))
}

// --- File Faces Endpoint ---

#[derive(Debug, Serialize)]
pub struct FileFacesResponse {
    pub success: bool,
    pub file_uuid: String,
    pub total: i64,
    pub page: usize,
    pub page_size: usize,
    pub data: Vec<FileFaceItem>,
}

#[derive(Debug, Serialize)]
pub struct FileFaceItem {
    pub id: i64,
    pub file_uuid: String,
    pub frame_number: i64,
    pub timestamp_secs: Option<f64>,
    pub face_id: Option<String>,
    pub trace_id: Option<i32>,
    pub bbox: BBox,
    pub confidence: f64,
    pub binding: FaceBinding,
}

#[derive(Debug, Serialize)]
#[serde(untagged)]
pub enum FaceBinding {
    Identity {
        identity_id: i32,
        identity_uuid: String,
        identity_name: String,
    },
    Stranger {
        stranger_id: i32,
        metadata: serde_json::Value,
    },
    Dangling {
        old_identity_id: i32,
    },
    Unbound,
}

#[derive(Debug, Deserialize)]
pub struct FileFacesQuery {
    page: Option<usize>,
    page_size: Option<usize>,
    binding: Option<String>,
    trace_id: Option<i32>,
    min_confidence: Option<f64>,
    start_frame: Option<i64>,
    end_frame: Option<i64>,
}

async fn get_file_faces(
    State(state): State<crate::api::types::AppState>,
    Path(file_uuid): Path<String>,
    Query(params): Query<FileFacesQuery>,
) -> Result<Json<FileFacesResponse>, (StatusCode, String)> {
    let page = params.page.unwrap_or(1);
    let page_size = params.page_size.unwrap_or(50);
    let offset = ((page - 1) as i64) * (page_size as i64);

    let fd_table = crate::core::db::schema::table_name("face_detections");
    let id_table = crate::core::db::schema::table_name("identities");
    let st_table = crate::core::db::schema::table_name("strangers");
    let video_table = crate::core::db::schema::table_name("videos");

    // Build WHERE clauses
    let mut where_clauses = vec![format!(
        "fd.file_uuid = '{}'",
        file_uuid.replace('\'', "''")
    )];

    if let Some(ref binding) = params.binding {
        match binding.as_str() {
            "identity" => {
                where_clauses.push(format!("fd.identity_id IN (SELECT id FROM {})", id_table));
            }
            "stranger" => {
                where_clauses.push("fd.stranger_id IS NOT NULL".to_string());
            }
            "dangling" => {
                where_clauses.push(format!(
                    "fd.identity_id IS NOT NULL AND NOT EXISTS (SELECT 1 FROM {} WHERE id = fd.identity_id)",
                    id_table
                ));
            }
            "unbound" => {
                where_clauses.push("fd.identity_id IS NULL AND fd.stranger_id IS NULL".to_string());
            }
            _ => {}
        }
    }

    if let Some(tid) = params.trace_id {
        where_clauses.push(format!("fd.trace_id = {}", tid));
    }
    if let Some(mc) = params.min_confidence {
        where_clauses.push(format!("fd.confidence >= {}", mc));
    }
    if let Some(sf) = params.start_frame {
        where_clauses.push(format!("fd.frame_number >= {}", sf));
    }
    if let Some(ef) = params.end_frame {
        where_clauses.push(format!("fd.frame_number <= {}", ef));
    }

    let where_sql = where_clauses.join(" AND ");

    let select_sql = format!(
        "SELECT fd.id::bigint as id, fd.file_uuid, \
         fd.frame_number::bigint as frame_number, \
         (fd.frame_number::float8 / NULLIF(v.fps, 0)) as timestamp_secs, \
         fd.face_id, fd.trace_id, \
         fd.x::float8 as x, fd.y::float8 as y, \
         fd.width::float8 as width, fd.height::float8 as height, \
         fd.confidence::float8 as confidence, \
         fd.identity_id, fd.stranger_id, \
         i.uuid::text as identity_uuid, i.name as identity_name, \
         s.metadata as stranger_metadata \
         FROM {} fd \
         JOIN {} v ON v.file_uuid = fd.file_uuid \
         LEFT JOIN {} i ON i.id = fd.identity_id \
         LEFT JOIN {} s ON s.id = fd.stranger_id \
         WHERE {} \
         ORDER BY fd.frame_number, fd.trace_id \
         LIMIT {} OFFSET {}",
        fd_table, video_table, id_table, st_table, where_sql, page_size as i64, offset
    );

    let count_sql = format!(
        "SELECT COUNT(*) FROM {} fd \
         WHERE {}",
        fd_table, where_sql
    );

    use sqlx::Row;
    let rows = sqlx::query(&select_sql)
        .fetch_all(state.db.pool())
        .await
        .map_err(|e| (StatusCode::INTERNAL_SERVER_ERROR, e.to_string()))?;

    let total: i64 = sqlx::query_scalar(&count_sql)
        .fetch_one(state.db.pool())
        .await
        .map_err(|e| (StatusCode::INTERNAL_SERVER_ERROR, e.to_string()))?;

    let data: Vec<FileFaceItem> = rows
        .into_iter()
        .map(|r| {
            let identity_id: Option<i32> = r.get("identity_id");
            let identity_uuid: Option<String> = r.get("identity_uuid");
            let identity_name: Option<String> = r.get("identity_name");
            let stranger_id: Option<i32> = r.get("stranger_id");

            let binding = if let (Some(iid), Some(iuuid), Some(iname)) =
                (identity_id, identity_uuid, identity_name)
            {
                FaceBinding::Identity {
                    identity_id: iid,
                    identity_uuid: iuuid,
                    identity_name: iname,
                }
            } else if let Some(sid) = stranger_id {
                FaceBinding::Stranger {
                    stranger_id: sid,
                    metadata: r
                        .get::<Option<serde_json::Value>, _>("stranger_metadata")
                        .unwrap_or(serde_json::Value::Null),
                }
            } else if let Some(iid) = identity_id {
                FaceBinding::Dangling {
                    old_identity_id: iid,
                }
            } else {
                FaceBinding::Unbound
            };

            FileFaceItem {
                id: r.get("id"),
                file_uuid: r.get("file_uuid"),
                frame_number: r.get("frame_number"),
                timestamp_secs: r.get("timestamp_secs"),
                face_id: r.get("face_id"),
                trace_id: r.get("trace_id"),
                bbox: BBox {
                    x: r.get("x"),
                    y: r.get("y"),
                    width: r.get("width"),
                    height: r.get("height"),
                },
                confidence: r.get("confidence"),
                binding,
            }
        })
        .collect();

    Ok(Json(FileFacesResponse {
        success: true,
        file_uuid,
        total,
        page,
        page_size,
        data,
    }))
}

#[derive(Debug, Serialize)]
pub struct IdentityChunksResponse {
    pub success: bool,
    pub identity_uuid: String,
    pub name: String,
    pub total: i64,
    pub page: usize,
    pub page_size: usize,
    pub data: Vec<IdentityChunkItem>,
}

#[derive(Debug, Serialize)]
pub struct IdentityChunkItem {
    pub id: i64,
    pub file_uuid: String,
    pub chunk_id: String,
    pub chunk_type: String,
    pub start_frame: i64,
    pub end_frame: i64,
    pub fps: f64,
    pub start_time: Option<f64>,
    pub end_time: Option<f64>,
    pub text_content: Option<String>,
}

async fn get_identity_chunks(
    State(state): State<crate::api::types::AppState>,
    Path(identity_uuid): Path<String>,
    Query(params): Query<FilesQuery>,
) -> Result<Json<IdentityChunksResponse>, (StatusCode, String)> {
    let uuid = identity_uuid.replace('-', "");
    let id_table = crate::core::db::schema::table_name("identities");

    let identity: Option<(i32, String)> = sqlx::query_as(&format!(
        "SELECT id, name FROM {} WHERE REPLACE(uuid::text, '-', '') = $1",
        id_table
    ))
    .bind(&uuid)
    .fetch_optional(state.db.pool())
    .await
    .map_err(|e| (StatusCode::INTERNAL_SERVER_ERROR, e.to_string()))?;

    let (_identity_id, name) =
        identity.ok_or((StatusCode::NOT_FOUND, "Identity not found".to_string()))?;

    let page = params.page.unwrap_or(1);
    let page_size = params.page_size.unwrap_or(20);
    let offset = ((page - 1) as i64) * (page_size as i64);

    let records = state
        .db
        .get_identity_chunks(&uuid, page_size as i32, offset)
        .await
        .map_err(|e| (StatusCode::INTERNAL_SERVER_ERROR, e.to_string()))?;

    let data: Vec<IdentityChunkItem> = records
        .into_iter()
        .map(|r| IdentityChunkItem {
            id: r.id as i64,
            file_uuid: r.file_uuid,
            chunk_id: r.chunk_id,
            chunk_type: r.chunk_type,
            start_frame: r.start_frame,
            end_frame: r.end_frame,
            fps: r.fps,
            start_time: r.start_time,
            end_time: r.end_time,
            text_content: r.text_content,
        })
        .collect();

    Ok(Json(IdentityChunksResponse {
        success: true,
        identity_uuid: uuid.to_string().replace('-', ""),
        name,
        total: data.len() as i64,
        page,
        page_size,
        data,
    }))
}

// --- Resource Registry Endpoints (Phase 5) ---

#[derive(Debug, Deserialize)]
pub struct RegisterResourceRequest {
    pub resource_id: String,
    pub resource_type: String,
    pub category: String,
    pub capabilities: Option<serde_json::Value>,
    pub config: Option<serde_json::Value>,
    pub metadata: Option<serde_json::Value>,
}

#[derive(Debug, Serialize)]
pub struct ResourceResponse {
    pub success: bool,
    pub message: String,
    pub data: Option<Vec<ResourceItem>>,
}

#[derive(Debug, Serialize)]
pub struct ResourceItem {
    pub resource_id: String,
    pub resource_type: String,
    pub category: String,
    pub capabilities: Option<serde_json::Value>,
    pub config: Option<serde_json::Value>,
    pub metadata: Option<serde_json::Value>,
    pub status: String,
    pub last_heartbeat: Option<chrono::DateTime<chrono::Utc>>,
}

async fn register_resource(
    State(state): State<crate::api::types::AppState>,
    Json(req): Json<RegisterResourceRequest>,
) -> Result<Json<ResourceResponse>, (StatusCode, String)> {
    let resource = ResourceRecord {
        resource_id: req.resource_id.clone(),
        resource_type: req.resource_type.clone(),
        category: req.category.clone(),
        capabilities: req.capabilities,
        config: req.config,
        metadata: req.metadata,
        status: "online".to_string(),
        last_heartbeat: None,
        created_at: None,
    };

    state
        .db
        .register_resource(resource)
        .await
        .map_err(|e| (StatusCode::INTERNAL_SERVER_ERROR, e.to_string()))?;

    Ok(Json(ResourceResponse {
        success: true,
        message: "Resource registered successfully".to_string(),
        data: None, // We could return the full record, but simplified for now
    }))
}

#[derive(Debug, Deserialize)]
pub struct HeartbeatRequest {
    pub resource_id: String,
    pub status: Option<String>,
}

async fn heartbeat_resource(
    State(state): State<crate::api::types::AppState>,
    Json(req): Json<HeartbeatRequest>,
) -> Result<Json<ResourceResponse>, (StatusCode, String)> {
    let status = req.status.unwrap_or("online".to_string());
    state
        .db
        .heartbeat_resource(&req.resource_id, &status)
        .await
        .map_err(|e| (StatusCode::INTERNAL_SERVER_ERROR, e.to_string()))?;

    Ok(Json(ResourceResponse {
        success: true,
        message: "Heartbeat received".to_string(),
        data: None,
    }))
}

async fn list_resources(
    State(state): State<crate::api::types::AppState>,
) -> Result<Json<ResourceResponse>, (StatusCode, String)> {
    let records = state
        .db
        .list_resources()
        .await
        .map_err(|e| (StatusCode::INTERNAL_SERVER_ERROR, e.to_string()))?;

    let data: Vec<ResourceItem> = records
        .into_iter()
        .map(|r| ResourceItem {
            resource_id: r.resource_id,
            resource_type: r.resource_type,
            category: r.category,
            capabilities: r.capabilities,
            config: r.config,
            metadata: r.metadata,
            status: r.status,
            last_heartbeat: r.last_heartbeat,
        })
        .collect();

    Ok(Json(ResourceResponse {
        success: true,
        message: "Resources listed".to_string(),
        data: Some(data),
    }))
}

// ── Identity Upload ──────────────────────────────────────────

#[derive(Debug, Serialize)]
struct IdentityUploadResponse {
    success: bool,
    identity_uuid: String,
    name: String,
    message: String,
}

async fn upload_identity(
    State(state): State<crate::api::types::AppState>,
    Json(payload): Json<crate::core::identity::storage::IdentityFile>,
) -> Result<Json<IdentityUploadResponse>, (StatusCode, Json<serde_json::Value>)> {
    let parsed = uuid::Uuid::parse_str(&payload.identity_uuid)
        .map_err(|_| (StatusCode::BAD_REQUEST, Json(serde_json::json!({
            "success": false, "message": format!("Invalid identity_uuid: {}", payload.identity_uuid)
        }))))?;

    // Upsert into identities table
    let identities_table = crate::core::db::schema::table_name("identities");
    let metadata_json = serde_json::to_value(&payload.metadata).unwrap_or_default();
    let result = sqlx::query_as::<_, (String,)>(&format!(
        "INSERT INTO {} (uuid, name, identity_type, source, status, tmdb_id, tmdb_profile, metadata) \
         VALUES ($1, $2, $3, $4, $5, $6, $7, $8) \
         ON CONFLICT (uuid) DO UPDATE SET \
         name = EXCLUDED.name, source = EXCLUDED.source, status = EXCLUDED.status, \
         tmdb_id = EXCLUDED.tmdb_id, tmdb_profile = EXCLUDED.tmdb_profile, \
         metadata = EXCLUDED.metadata \
         RETURNING uuid::text", identities_table
    ))
    .bind(parsed)
    .bind(&payload.name)
    .bind(&payload.identity_type)
    .bind(&payload.source)
    .bind(&payload.status)
    .bind(payload.tmdb_id)
    .bind(&payload.tmdb_profile)
    .bind(&metadata_json)
    .fetch_optional(state.db.pool())
    .await
    .map_err(|e| (StatusCode::INTERNAL_SERVER_ERROR, Json(serde_json::json!({
        "success": false, "message": format!("DB error: {}", e)
    }))))?;

    let uuid_str = match result {
        Some((u,)) => crate::core::identity::storage::update_index(&u, &payload.name)
            .and(Ok(u))
            .unwrap_or_else(|_| payload.identity_uuid.clone()),
        None => payload.identity_uuid.clone(),
    };

    // Write identity.json to filesystem (strip hyphens from UUID for directory name)
    let mut file_payload = payload.clone();
    file_payload.identity_uuid = file_payload.identity_uuid.replace('-', "");
    if let Err(e) = crate::core::identity::storage::write_identity_file(&file_payload) {
        tracing::warn!("[identity-upload] Failed to write identity.json: {}", e);
    }

    Ok(Json(IdentityUploadResponse {
        success: true,
        identity_uuid: uuid_str.replace('-', ""),
        name: file_payload.name,
        message: "Identity uploaded successfully".to_string(),
    }))
}

// ── Profile Image Upload ────────────────────────────────────

#[derive(Debug, Serialize)]
struct ProfileImageResponse {
    success: bool,
    identity_uuid: String,
    path: String,
    message: String,
}

async fn upload_profile_image(
    State(state): State<crate::api::types::AppState>,
    Path(identity_uuid): Path<String>,
    mut multipart: Multipart,
) -> Result<Json<ProfileImageResponse>, (StatusCode, Json<serde_json::Value>)> {
    let uuid_clean = identity_uuid.replace('-', "");

    // Verify identity exists
    if state
        .db
        .get_identity_by_uuid(&uuid_clean)
        .await
        .map_err(|_| {
            (
                StatusCode::INTERNAL_SERVER_ERROR,
                Json(serde_json::json!({"success": false, "message": "DB error"})),
            )
        })?
        .is_none()
    {
        return Err((
            StatusCode::NOT_FOUND,
            Json(serde_json::json!({
                "success": false, "message": "Identity not found"
            })),
        ));
    }

    // Process multipart upload
    let mut image_data: Option<Vec<u8>> = None;
    let mut ext: &str = "jpg";

    while let Ok(Some(field)) = multipart.next_field().await {
        let name = field.name().unwrap_or("").to_string();
        if name == "image" {
            let content_type = field.content_type().unwrap_or("image/jpeg").to_string();
            ext = match content_type.as_str() {
                "image/png" => "png",
                "image/jpeg" | "image/jpg" => "jpg",
                _ => {
                    return Err((
                        StatusCode::BAD_REQUEST,
                        Json(serde_json::json!({
                            "success": false, "message": "Unsupported image type. Use JPEG or PNG."
                        })),
                    ))
                }
            };
            image_data = Some(field.bytes().await.map_err(|_| {
                (StatusCode::BAD_REQUEST, Json(serde_json::json!({"success": false, "message": "Failed to read image data"})))
            })?.to_vec());
        }
    }

    let data = image_data.ok_or_else(|| {
        (
            StatusCode::BAD_REQUEST,
            Json(serde_json::json!({
                "success": false, "message": "No image field found. Use field name 'image'."
            })),
        )
    })?;

    // Write image file
    let dir = crate::core::identity::storage::identity_dir(&uuid_clean);
    std::fs::create_dir_all(&dir).map_err(|e| {
        (StatusCode::INTERNAL_SERVER_ERROR, Json(serde_json::json!({"success": false, "message": format!("Failed to create dir: {}", e)})))
    })?;

    let file_name = format!("profile.{}", ext);
    let file_path = dir.join(&file_name);
    std::fs::write(&file_path, &data).map_err(|e| {
        (StatusCode::INTERNAL_SERVER_ERROR, Json(serde_json::json!({"success": false, "message": format!("Failed to write file: {}", e)})))
    })?;

    // Sync identity JSON to reflect new profile image
    let pool = state.db.pool().clone();
    let uuid_clone = uuid_clean.clone();
    let _ = crate::core::identity::storage::save_identity_file_by_pool(&pool, &uuid_clone).await;

    Ok(Json(ProfileImageResponse {
        success: true,
        identity_uuid: uuid_clean,
        path: file_path.to_string_lossy().to_string(),
        message: format!("Profile image saved: {}", file_name),
    }))
}

async fn get_profile_image(
    Path(identity_uuid): Path<String>,
) -> Result<(StatusCode, [(String, String); 1], Vec<u8>), StatusCode> {
    let uuid_clean = identity_uuid.replace('-', "");
    let dir = crate::core::identity::storage::identity_dir(&uuid_clean);

    for ext in &["jpg", "png"] {
        let path = dir.join(format!("profile.{}", ext));
        if path.exists() {
            let data = std::fs::read(&path).map_err(|_| StatusCode::NOT_FOUND)?;
            let content_type = if *ext == "png" {
                "image/png"
            } else {
                "image/jpeg"
            };
            return Ok((
                StatusCode::OK,
                [("content-type".to_string(), content_type.to_string())],
                data,
            ));
        }
    }
    Err(StatusCode::NOT_FOUND)
}

#[derive(Debug, Deserialize)]
pub struct SetProfileFromFaceRequest {
    pub file_uuid: String,
    pub face_id: Option<String>,
    pub id: Option<i64>,
}

async fn set_profile_from_face(
    State(state): State<crate::api::types::AppState>,
    Path(identity_uuid): Path<String>,
    Json(req): Json<SetProfileFromFaceRequest>,
) -> Result<Json<ProfileImageResponse>, (StatusCode, Json<serde_json::Value>)> {
    use crate::core::db::schema;
    let fd_table = schema::table_name("face_detections");
    let videos_table = schema::table_name("videos");

    let uuid_clean = identity_uuid.replace('-', "");

    let face_identifier = match (&req.face_id, req.id) {
        (Some(fid), _) => fid.clone(),
        (None, Some(id)) => id.to_string(),
        (None, None) => {
            return Err((
                StatusCode::BAD_REQUEST,
                Json(serde_json::json!({"success": false, "message": "Either face_id or id is required"})),
            ));
        }
    };

    let use_id_field = req.id.is_some();

    let row: Option<(i64, i32, i32, i32, i32, f64)> = if use_id_field {
        sqlx::query_as(&format!(
            "SELECT frame_number, x, y, width, height, confidence FROM {} WHERE file_uuid = $1 AND id = $2",
            fd_table
        ))
        .bind(&req.file_uuid)
        .bind(req.id.unwrap())
        .fetch_optional(state.db.pool())
        .await
    } else {
        sqlx::query_as(&format!(
            "SELECT frame_number, x, y, width, height, confidence FROM {} WHERE file_uuid = $1 AND face_id = $2",
            fd_table
        ))
        .bind(&req.file_uuid)
        .bind(&face_identifier)
        .fetch_optional(state.db.pool())
        .await
    }
    .map_err(|e| {
        (
            StatusCode::INTERNAL_SERVER_ERROR,
            Json(serde_json::json!({"success": false, "message": format!("DB error: {}", e)})),
        )
    })?;

    let (frame_number, x, y, width, height, confidence) = row.ok_or_else(|| {
        (
            StatusCode::NOT_FOUND,
            Json(serde_json::json!({"success": false, "message": "Face not found"})),
        )
    })?;

    let video_row: Option<(String, Option<i32>, Option<i32>)> = sqlx::query_as(&format!(
        "SELECT file_path, width, height FROM {} WHERE file_uuid = $1",
        videos_table
    ))
    .bind(&req.file_uuid)
    .fetch_optional(state.db.pool())
    .await
    .map_err(|e| {
        (
            StatusCode::INTERNAL_SERVER_ERROR,
            Json(serde_json::json!({"success": false, "message": format!("DB error: {}", e)})),
        )
    })?;

    let (file_path, video_width, video_height) = video_row.ok_or_else(|| {
        (
            StatusCode::NOT_FOUND,
            Json(serde_json::json!({"success": false, "message": "Video file not found"})),
        )
    })?;

    let vw = video_width.unwrap_or(1920);
    let vh = video_height.unwrap_or(1080);

    crate::core::thumbnail::validator::validate_crop(x, y, width, height, vw, vh).map_err(|e| {
        (
            StatusCode::BAD_REQUEST,
            Json(serde_json::json!({"success": false, "message": format!("Crop validation failed: {}", e)})),
        )
    })?;

    let select = format!("select=eq(n\\,{})", frame_number);
    let vf = format!("{},crop={}:{}:{}:{}", select, width, height, x, y);

    let output = Command::new("ffmpeg")
        .args([
            "-i",
            &file_path,
            "-vf",
            &vf,
            "-frames:v",
            "1",
            "-f",
            "image2pipe",
            "-vcodec",
            "mjpeg",
            "-",
        ])
        .output()
        .map_err(|e| {
            (
                StatusCode::INTERNAL_SERVER_ERROR,
                Json(serde_json::json!({"success": false, "message": format!("FFmpeg failed: {}", e)})),
            )
        })?;

    if !output.status.success() {
        return Err((
            StatusCode::INTERNAL_SERVER_ERROR,
            Json(serde_json::json!({"success": false, "message": "FFmpeg extraction failed"})),
        ));
    }

    crate::core::thumbnail::validator::validate_jpeg(&output.stdout).map_err(|e| {
        (
            StatusCode::INTERNAL_SERVER_ERROR,
            Json(serde_json::json!({"success": false, "message": format!("JPEG validation failed: {}", e)})),
        )
    })?;

    let dir = crate::core::identity::storage::identity_dir(&uuid_clean);
    std::fs::create_dir_all(&dir).map_err(|e| {
        (StatusCode::INTERNAL_SERVER_ERROR, Json(serde_json::json!({"success": false, "message": format!("Failed to create dir: {}", e)})))
    })?;

    let file_name = "profile.jpg";
    let file_path = dir.join(file_name);
    std::fs::write(&file_path, &output.stdout).map_err(|e| {
        (StatusCode::INTERNAL_SERVER_ERROR, Json(serde_json::json!({"success": false, "message": format!("Failed to write file: {}", e)})))
    })?;

    let pool = state.db.pool().clone();
    let uuid_clone = uuid_clean.clone();
    let _ = crate::core::identity::storage::save_identity_file_by_pool(&pool, &uuid_clone).await;

    Ok(Json(ProfileImageResponse {
        success: true,
        identity_uuid: uuid_clean,
        path: file_path.to_string_lossy().to_string(),
        message: format!("Profile image set from face {} (frame {}, confidence {:.2})", face_identifier, frame_number, confidence),
    }))
}

async fn get_identity_json(
    State(state): State<crate::api::types::AppState>,
    Path(identity_uuid): Path<String>,
) -> Result<(StatusCode, [(String, String); 1], Vec<u8>), StatusCode> {
    let clean = identity_uuid.replace('-', "");
    let with_hyphens = if clean.len() == 32 {
        format!(
            "{}-{}-{}-{}-{}",
            &clean[0..8],
            &clean[8..12],
            &clean[12..16],
            &clean[16..20],
            &clean[20..32]
        )
    } else {
        identity_uuid.clone()
    };

    // 1. Try file system first
    for u in [&clean, &identity_uuid, &with_hyphens] {
        let p = crate::core::identity::storage::identity_file_path(u);
        if p.exists() {
            let data = std::fs::read(&p).map_err(|_| StatusCode::NOT_FOUND)?;
            return Ok((
                StatusCode::OK,
                [("content-type".to_string(), "application/json".to_string())],
                data,
            ));
        }
    }

    // 2. Lazy Sync: If file missing, generate from DB and save
    if let Err(e) =
        crate::core::identity::storage::save_identity_file_by_pool(state.db.pool(), &clean).await
    {
        tracing::warn!("[identity-json] Lazy sync failed for {}: {}", clean, e);
        return Err(StatusCode::NOT_FOUND);
    }

    // 3. Read the newly generated file (try all UUID variants)
    for u in [&clean, &identity_uuid, &with_hyphens] {
        let p = crate::core::identity::storage::identity_file_path(u);
        if p.exists() {
            let data = std::fs::read(&p).map_err(|_| StatusCode::NOT_FOUND)?;
            return Ok((
                StatusCode::OK,
                [("content-type".to_string(), "application/json".to_string())],
                data,
            ));
        }
    }

    Err(StatusCode::NOT_FOUND)
}

// ── Experiment: Identity Text Search ──────────────────────────
// Separate endpoints — do not modify existing API behavior.

#[derive(Debug, Deserialize)]
struct IdentityTextQuery {
    #[serde(default)]
    file_uuid: Option<String>,
    q: String,
    limit: Option<i64>,
    page: Option<usize>,
    page_size: Option<usize>,
}

#[derive(Debug, Serialize)]
struct IdentityTextHit {
    file_uuid: String,
    chunk_id: String,
    start_time: f64,
    end_time: f64,
    text_content: Option<String>,
    identity_id: Option<i32>,
    identity_name: Option<String>,
    identity_source: Option<String>,
    trace_id: Option<i32>,
}

#[derive(Debug, Serialize)]
struct IdentityTextResponse {
    success: bool,
    total: i64,
    page: usize,
    page_size: usize,
    limit: usize,
    results: Vec<IdentityTextHit>,
}

/// Path A: Search chunk text → associated identities
async fn search_identity_text(
    State(state): State<crate::api::types::AppState>,
    Query(params): Query<IdentityTextQuery>,
) -> Result<Json<IdentityTextResponse>, StatusCode> {
    use crate::core::db::schema;
    let chunk_table = schema::table_name("chunk");
    let fd_table = schema::table_name("face_detections");
    let id_table = schema::table_name("identities");
    let like_q = format!("%{}%", params.q.replace('%', "%%"));
    let limit = params.limit.unwrap_or(50).min(100);

    let sd_table = schema::table_name("speaker_detections");
    let query = format!(
        r#"SELECT c.file_uuid, c.chunk_id, c.start_time, c.end_time, c.text_content,
                  fd.identity_id, i.name AS identity_name, i.source AS identity_source,
                  fd.trace_id
           FROM {} c
           LEFT JOIN {} fd ON fd.file_uuid = c.file_uuid
               AND fd.frame_number BETWEEN c.start_frame AND c.end_frame
               AND fd.identity_id IS NOT NULL
           LEFT JOIN {} i ON i.id = fd.identity_id
           WHERE ($1::text IS NULL OR c.file_uuid = $1) AND (LOWER(c.text_content) LIKE LOWER($2) OR LOWER(c.content::text) LIKE LOWER($2))

           UNION ALL

           SELECT sd.file_uuid, COALESCE(c.chunk_id, sd.chunk_id),
                  sd.start_time, sd.end_time, sd.text_content,
                  sd.identity_id, i.name AS identity_name, i.source AS identity_source,
                  NULL::int AS trace_id
           FROM {} sd
           JOIN {} i ON i.id = sd.identity_id
           LEFT JOIN {} c ON c.chunk_id = sd.chunk_id
           WHERE ($1::text IS NULL OR sd.file_uuid = $1) AND (LOWER(sd.text_content) LIKE LOWER($2) OR LOWER($2) = '%%')

           ORDER BY 3
           LIMIT $3"#,
        chunk_table, fd_table, id_table, sd_table, id_table, chunk_table
    );

    let rows = sqlx::query_as::<
        _,
        (
            String,
            String,
            f64,
            f64,
            Option<String>,
            Option<i32>,
            Option<String>,
            Option<String>,
            Option<i32>,
        ),
    >(&query)
    .bind(&params.file_uuid)
    .bind(&like_q)
    .bind(limit)
    .fetch_all(state.db.pool())
    .await
    .map_err(|_| StatusCode::INTERNAL_SERVER_ERROR)?;

    let results: Vec<IdentityTextHit> = rows
        .into_iter()
        .map(
            |(fu, cid, st, et, txt, iid, iname, isrc, tid)| IdentityTextHit {
                file_uuid: fu,
                chunk_id: cid,
                start_time: st,
                end_time: et,
                text_content: txt,
                identity_id: iid,
                identity_name: iname,
                identity_source: isrc,
                trace_id: tid,
            },
        )
        .collect();

    let total = results.len() as i64;
    let page = params.page.unwrap_or(1).max(1);
    let page_size = params.page_size.unwrap_or(total as usize).max(1);
    let start = (page - 1) * page_size;
    let paged: Vec<IdentityTextHit> = results.into_iter().skip(start).take(page_size).collect();
    let limit = params.limit.unwrap_or(50) as usize;
    Ok(Json(IdentityTextResponse {
        success: true,
        total,
        page,
        page_size,
        limit,
        results: paged,
    }))
}

#[derive(Debug, Deserialize)]
struct IdentitySearchQuery {
    q: String,
    file_uuid: Option<String>,
    page: Option<i64>,
    page_size: Option<i64>,
    limit: Option<i64>,
}

#[derive(Debug, Serialize)]
struct IdentitySearchHit {
    identity_id: i32,
    name: String,
    source: Option<String>,
    tmdb_id: Option<i32>,
    file_uuid: String,
    trace_id: Option<i32>,
    chunk_id: String,
    start_frame: i64,
    end_frame: i64,
    fps: f64,
    start_time: f64,
    end_time: f64,
    text_content: Option<String>,
}

#[derive(Debug, Serialize)]
struct IdentitySearchResponse {
    success: bool,
    page: i64,
    page_size: i64,
    total: i64,
    results: Vec<IdentitySearchHit>,
}

/// Path B: Search identity name → associated chunk text
async fn search_identities_by_text(
    State(state): State<crate::api::types::AppState>,
    Query(params): Query<IdentitySearchQuery>,
) -> Result<Json<IdentitySearchResponse>, StatusCode> {
    use crate::core::db::schema;
    let id_table = schema::table_name("identities");
    let fd_table = schema::table_name("face_detections");
    let chunk_table = schema::table_name("chunk");
    let like_q = format!("%{}%", params.q.replace('%', "%%"));
    let page = params.page.unwrap_or(1).max(1);
    let page_size = params
        .page_size
        .or(params.limit)
        .unwrap_or(20)
        .min(100)
        .max(1);
    let offset = (page - 1) * page_size;

    let sd_table = schema::table_name("speaker_detections");
    let ib_table = schema::table_name("identity_bindings");
    let query = format!(
        r#"WITH matched AS (
           SELECT i.id::int, i.name, i.source, i.tmdb_id,
                  fd.file_uuid, fd.trace_id,
                  c.chunk_id, c.start_frame, c.end_frame, c.fps,
                  c.start_time, c.end_time, c.text_content
           FROM {} i
            JOIN {} ib ON ib.identity_id = i.id AND ib.identity_type = 'trace'
            JOIN {} fd ON fd.trace_id = ib.identity_value::int
            JOIN {} c ON c.file_uuid = fd.file_uuid
                AND c.start_time <= fd.frame_number / COALESCE(c.fps, 25.0)
                AND c.end_time >= fd.frame_number / COALESCE(c.fps, 25.0)
              WHERE (i.name ILIKE $1
                 OR EXISTS (
                     SELECT 1 FROM jsonb_array_elements(i.metadata->'aliases') AS a
                     WHERE a->>'name' ILIKE $1
                 ))
                AND ($2::text IS NULL OR fd.file_uuid = $2)

             UNION ALL

            SELECT i.id::int, i.name, i.source, i.tmdb_id,
                   sd.file_uuid, NULL::int AS trace_id,
                   COALESCE(c.chunk_id, sd.chunk_id) as chunk_id,
                   c.start_frame, c.end_frame, c.fps,
                   sd.start_time, sd.end_time, sd.text_content
            FROM {} i
            JOIN {} sd ON sd.identity_id = i.id
            LEFT JOIN {} c ON c.chunk_id = sd.chunk_id
            WHERE (i.name ILIKE $1
                OR EXISTS (
                    SELECT 1 FROM jsonb_array_elements(i.metadata->'aliases') AS a
                    WHERE a->>'name' ILIKE $1
                ))
               AND ($2::text IS NULL OR sd.file_uuid = $2)
),
deduped AS (
    SELECT DISTINCT ON (name, chunk_id) *
    FROM matched
    ORDER BY name, chunk_id, start_time
)
SELECT *, COUNT(*) OVER() AS total_count
FROM deduped
ORDER BY name, start_time
LIMIT $3 OFFSET $4"#,
        id_table, ib_table, fd_table, chunk_table, id_table, sd_table, chunk_table
    );

    let rows = sqlx::query(&query)
        .bind(&like_q)
        .bind(&params.file_uuid)
        .bind(page_size)
        .bind(offset)
        .fetch_all(state.db.pool())
        .await
        .map_err(|e| {
            tracing::error!("[identities/search] Query failed: {}", e);
            StatusCode::INTERNAL_SERVER_ERROR
        })?;

    let total = rows.first().map(|r| r.get::<i64, _>(13)).unwrap_or(0);
    let results: Vec<IdentitySearchHit> = rows
        .into_iter()
        .map(|r| IdentitySearchHit {
            identity_id: r.get(0),
            name: r.get(1),
            source: r.get(2),
            tmdb_id: r.get(3),
            file_uuid: r.get(4),
            trace_id: r.get(5),
            chunk_id: r.get(6),
            start_frame: r.get(7),
            end_frame: r.get(8),
            fps: r.get(9),
            start_time: r.get(10),
            end_time: r.get(11),
            text_content: r.get(12),
        })
        .collect();

    Ok(Json(IdentitySearchResponse {
        success: true,
        page,
        page_size,
        total,
        results,
    }))
}

// ── PATCH /api/v1/identity/:identity_uuid ────────────────────

#[derive(Debug, Deserialize)]
struct UpdateIdentityRequest {
    name: Option<String>,
    metadata: Option<serde_json::Value>,
    status: Option<String>,
    identity_type: Option<String>,
}

#[derive(Debug, Serialize)]
struct UpdateIdentityResponse {
    success: bool,
    identity_uuid: String,
    updated_fields: Vec<String>,
}

async fn update_identity(
    State(state): State<crate::api::types::AppState>,
    Extension(auth): Extension<crate::api::middleware::UserAuth>,
    Path(identity_uuid): Path<String>,
    Json(req): Json<UpdateIdentityRequest>,
) -> Result<Json<UpdateIdentityResponse>, (StatusCode, Json<serde_json::Value>)> {
    let uuid_clean = identity_uuid.replace('-', "");
    let uuid_parsed = uuid::Uuid::parse_str(&uuid_clean).map_err(|_| {
        (
            StatusCode::BAD_REQUEST,
            Json(serde_json::json!({
                "success": false, "error": "Invalid identity_uuid"
            })),
        )
    })?;

    let table = crate::core::db::schema::table_name("identities");
    let history_table = crate::core::db::schema::table_name("identity_history");

    // Get before snapshot (current state)
    let before_snapshot: Option<serde_json::Value> = sqlx::query_scalar(&format!(
        "SELECT jsonb_build_object('id', id, 'uuid', uuid::text, 'name', name, 'identity_type', identity_type, 'source', source, 'status', status, 'metadata', metadata, 'tmdb_id', tmdb_id, 'tmdb_profile', tmdb_profile) FROM {} WHERE REPLACE(uuid::text, '-', '') = $1",
        table
    ))
    .bind(&uuid_clean)
    .fetch_optional(state.db.pool())
    .await
    .map_err(|e| {
        (
            StatusCode::INTERNAL_SERVER_ERROR,
            Json(serde_json::json!({
                "success": false, "error": format!("DB error: {}", e)
            })),
        )
    })?;

    // Use text-based UUID comparison to avoid UUID type encoding issues
    let existing: Option<(i32, String)> = sqlx::query_as(&format!(
        "SELECT id, name FROM {} WHERE REPLACE(uuid::text, '-', '') = $1",
        table
    ))
    .bind(&uuid_clean)
    .fetch_optional(state.db.pool())
    .await
    .map_err(|e| {
        (
            StatusCode::INTERNAL_SERVER_ERROR,
            Json(serde_json::json!({
                "success": false, "error": format!("DB error: {}", e)
            })),
        )
    })?;

    let (identity_id, old_name) = existing.ok_or_else(|| {
        (
            StatusCode::NOT_FOUND,
            Json(serde_json::json!({
                "success": false, "error": "Identity not found"
            })),
        )
    })?;

    let mut updated_fields: Vec<String> = Vec::new();
    let mut set_clauses: Vec<String> = Vec::new();

    if let Some(ref name) = req.name {
        set_clauses.push(format!("name = ${}", set_clauses.len() + 1));
        updated_fields.push("name".to_string());
    }
    if let Some(ref metadata) = req.metadata {
        if !metadata.is_object() {
            return Err((
                StatusCode::BAD_REQUEST,
                Json(serde_json::json!({
                    "success": false, "error": "metadata must be a JSON object"
                })),
            ));
        }
        set_clauses.push(format!(
            "metadata = jsonb_deep_merge(COALESCE(metadata, '{{}}'::jsonb), ${}::jsonb)",
            set_clauses.len() + 1
        ));
        updated_fields.push("metadata".to_string());
    }
    if let Some(ref status) = req.status {
        set_clauses.push(format!("status = ${}", set_clauses.len() + 1));
        updated_fields.push("status".to_string());
    }
    if let Some(ref identity_type) = req.identity_type {
        set_clauses.push(format!("identity_type = ${}", set_clauses.len() + 1));
        updated_fields.push("identity_type".to_string());
    }

    if set_clauses.is_empty() {
        return Err((
            StatusCode::BAD_REQUEST,
            Json(serde_json::json!({
                "success": false, "error": "No fields to update"
            })),
        ));
    }

    // Clear redo stack (only PATCH operations, not bind)
    sqlx::query(&format!(
        "DELETE FROM {} WHERE identity_id = $1 AND is_undone = true AND operation = 'update'",
        history_table
    ))
    .bind(identity_id)
    .execute(state.db.pool())
    .await
    .map_err(|e| {
        (
            StatusCode::INTERNAL_SERVER_ERROR,
            Json(serde_json::json!({
                "success": false, "error": format!("Failed to clear redo stack: {}", e)
            })),
        )
    })?;

    let set_sql = set_clauses.join(", ");
    let uuid_param = set_clauses.len() + 1;
    let update_sql = format!(
        "UPDATE {} SET {} WHERE REPLACE(uuid::text, '-', '') = ${}",
        table, set_sql, uuid_param
    );

    let mut query = sqlx::query(&update_sql);

    if let Some(ref name) = req.name {
        query = query.bind(name);
    }
    if let Some(ref metadata) = req.metadata {
        query = query.bind(metadata);
    }
    if let Some(ref status) = req.status {
        query = query.bind(status);
    }
    if let Some(ref identity_type) = req.identity_type {
        query = query.bind(identity_type);
    }

    query = query.bind(&uuid_clean);

    query.execute(state.db.pool()).await.map_err(|e| {
        (
            StatusCode::INTERNAL_SERVER_ERROR,
            Json(serde_json::json!({
                "success": false, "error": format!("Update failed: {}", e)
            })),
        )
    })?;

    // Get after snapshot
    let after_snapshot: Option<serde_json::Value> = sqlx::query_scalar(&format!(
        "SELECT jsonb_build_object('id', id, 'uuid', uuid::text, 'name', name, 'identity_type', identity_type, 'source', source, 'status', status, 'metadata', metadata, 'tmdb_id', tmdb_id, 'tmdb_profile', tmdb_profile) FROM {} WHERE REPLACE(uuid::text, '-', '') = $1",
        table
    ))
    .bind(&uuid_clean)
    .fetch_optional(state.db.pool())
    .await
    .map_err(|e| {
        (
            StatusCode::INTERNAL_SERVER_ERROR,
            Json(serde_json::json!({
                "success": false, "error": format!("Failed to get after snapshot: {}", e)
            })),
        )
    })?;

    // Insert history record with user tracking
    let uid = auth.user_id.to_string();
    let usrc = match auth.source {
        crate::api::middleware::AuthSource::Jwt => "jwt",
        crate::api::middleware::AuthSource::Session => "session",
        crate::api::middleware::AuthSource::ApiKey => "api_key",
    };
    sqlx::query(&format!(
        "INSERT INTO {} (identity_id, operation, before_snapshot, after_snapshot, is_undone, user_id, user_source) VALUES ($1, 'update', $2, $3, false, $4, $5)",
        history_table
    ))
    .bind(identity_id)
    .bind(before_snapshot)
    .bind(after_snapshot)
    .bind(&uid)
    .bind(usrc)
    .execute(state.db.pool())
    .await
    .map_err(|e| {
        (
            StatusCode::INTERNAL_SERVER_ERROR,
            Json(serde_json::json!({
                "success": false, "error": format!("Failed to insert history: {}", e)
            })),
        )
    })?;

    // Cleanup: keep max 256 history records per identity
    let count: i64 = sqlx::query_scalar(&format!(
        "SELECT COUNT(*) FROM {} WHERE identity_id = $1",
        history_table
    ))
    .bind(identity_id)
    .fetch_one(state.db.pool())
    .await
    .map_err(|e| {
        (
            StatusCode::INTERNAL_SERVER_ERROR,
            Json(serde_json::json!({
                "success": false, "error": format!("Failed to count history: {}", e)
            })),
        )
    })?;

    if count > 256 {
        let delete_count = count - 256;
        sqlx::query(&format!(
            "DELETE FROM {} WHERE identity_id = $1 AND id IN (SELECT id FROM {} WHERE identity_id = $1 ORDER BY created_at ASC LIMIT $2)",
            history_table, history_table
        ))
        .bind(identity_id)
        .bind(delete_count)
        .execute(state.db.pool())
        .await
        .map_err(|e| {
            (
                StatusCode::INTERNAL_SERVER_ERROR,
                Json(serde_json::json!({
                    "success": false, "error": format!("Failed to cleanup history: {}", e)
                })),
            )
        })?;
    }

    // Sync identity.json to disk
    let _ =
        crate::core::identity::storage::save_identity_file_by_pool(state.db.pool(), &uuid_clean)
            .await;

    // If name changed, update _index.json
    if req.name.is_some() {
        let new_name = req.name.as_deref().unwrap_or(&old_name);
        let _ = crate::core::identity::storage::update_index(&uuid_clean, new_name);
    }

    Ok(Json(UpdateIdentityResponse {
        success: true,
        identity_uuid: uuid_clean,
        updated_fields,
    }))
}

// ── Undo/Redo APIs ────────────────────────────────────────────────

#[derive(Debug, Deserialize)]
struct UndoRequest {
    steps: Option<usize>,
}

#[derive(Debug, Serialize)]
struct UndoResponse {
    success: bool,
    identity_uuid: String,
    undone_count: usize,
    current_state: serde_json::Value,
}

async fn undo_identity(
    State(state): State<crate::api::types::AppState>,
    Extension(_auth): Extension<crate::api::middleware::UserAuth>,
    Path(identity_uuid): Path<String>,
    Json(req): Json<UndoRequest>,
) -> Result<Json<UndoResponse>, (StatusCode, Json<serde_json::Value>)> {
    let uuid_clean = identity_uuid.replace('-', "");
    let steps = req.steps.unwrap_or(1).max(1);

    let table = crate::core::db::schema::table_name("identities");
    let history_table = crate::core::db::schema::table_name("identity_history");
    let face_table = crate::core::db::schema::table_name("face_detections");

    // Try normal identity lookup
    let identity_row: Option<(i32,)> = sqlx::query_as(&format!(
        "SELECT id FROM {} WHERE REPLACE(uuid::text, '-', '') = $1",
        table
    ))
    .bind(&uuid_clean)
    .fetch_optional(state.db.pool())
    .await
    .map_err(|e| {
        (
            StatusCode::INTERNAL_SERVER_ERROR,
            Json(serde_json::json!({
                "success": false, "error": format!("DB error: {}", e)
            })),
        )
    })?;

    let (identity_id,) = match identity_row {
        Some(row) => row,
        None => {
            // Identity might have been deleted — check for delete history
            let delete_record: Option<(i64, serde_json::Value)> = sqlx::query_as(&format!(
                "SELECT id, before_snapshot FROM {} WHERE operation = 'delete' AND is_undone = false AND REPLACE(before_snapshot->'identity'->>'uuid', '-', '') = $1 ORDER BY created_at DESC LIMIT 1",
                history_table
            ))
            .bind(&uuid_clean)
            .fetch_optional(state.db.pool())
            .await
            .map_err(|e| {
                (
                    StatusCode::INTERNAL_SERVER_ERROR,
                    Json(serde_json::json!({
                        "success": false, "error": format!("Failed to check delete history: {}", e)
                    })),
                )
            })?;

            let (history_id, snapshot) = delete_record.ok_or_else(|| {
                (
                    StatusCode::BAD_REQUEST,
                    Json(serde_json::json!({
                        "success": false, "error": "No undo operations available"
                    })),
                )
            })?;

            // Recreate identity from snapshot
            let identity_obj = snapshot.get("identity").ok_or_else(|| {
                (
                    StatusCode::INTERNAL_SERVER_ERROR,
                    Json(serde_json::json!({
                        "success": false, "error": "Missing identity snapshot"
                    })),
                )
            })?;

            let new_id: i32 = sqlx::query_scalar(&format!(
                "INSERT INTO {} (uuid, name, identity_type, source, status, metadata, tmdb_id, tmdb_profile) VALUES ($1::uuid, $2, $3, $4, $5, $6::jsonb, $7, $8) RETURNING id",
                table
            ))
            .bind(identity_obj.get("uuid").and_then(|v| v.as_str()).unwrap_or(""))
            .bind(identity_obj.get("name").and_then(|v| v.as_str()).unwrap_or(""))
            .bind(identity_obj.get("identity_type").and_then(|v| v.as_str()))
            .bind(identity_obj.get("source").and_then(|v| v.as_str()))
            .bind(identity_obj.get("status").and_then(|v| v.as_str()))
            .bind(identity_obj.get("metadata").cloned().unwrap_or(serde_json::json!({})))
            .bind(identity_obj.get("tmdb_id").and_then(|v| v.as_i64()))
            .bind(identity_obj.get("tmdb_profile").and_then(|v| v.as_str()))
            .fetch_one(state.db.pool())
            .await
            .map_err(|e| {
                (
                    StatusCode::INTERNAL_SERVER_ERROR,
                    Json(serde_json::json!({
                        "success": false, "error": format!("Failed to recreate identity: {}", e)
                    })),
                )
            })?;

            // Re-bind faces
            if let Some(faces) = snapshot.get("unbound_faces").and_then(|v| v.as_array()) {
                for face in faces {
                    let file_uuid = face.get("file_uuid").and_then(|v| v.as_str());
                    let face_id = face.get("face_id").and_then(|v| v.as_str());
                    let trace_id = face.get("trace_id").and_then(|v| v.as_i64());
                    if let (Some(fu), Some(fid)) = (file_uuid, face_id) {
                        let _ = sqlx::query(&format!(
                            "UPDATE {} SET identity_id = $1 WHERE file_uuid = $2 AND face_id = $3",
                            face_table
                        ))
                        .bind(new_id)
                        .bind(fu)
                        .bind(fid)
                        .execute(state.db.pool())
                        .await;
                    }
                }
            }

            // Mark delete history as undone
            let _ = sqlx::query(&format!(
                "UPDATE {} SET is_undone = true, undone_at = NOW() WHERE id = $1",
                history_table
            ))
            .bind(history_id)
            .execute(state.db.pool())
            .await;

            // Sync identity.json
            let _ = crate::core::identity::storage::save_identity_file_by_pool(
                state.db.pool(),
                &uuid_clean,
            )
            .await;

            // Update index
            let new_name = identity_obj
                .get("name")
                .and_then(|v| v.as_str())
                .unwrap_or("");
            let _ = crate::core::identity::storage::update_index(&uuid_clean, new_name);

            // Get current state
            let current_state: serde_json::Value = sqlx::query_scalar(&format!(
                "SELECT jsonb_build_object('id', id, 'uuid', uuid::text, 'name', name, 'identity_type', identity_type, 'source', source, 'status', status, 'metadata', metadata, 'tmdb_id', tmdb_id, 'tmdb_profile', tmdb_profile) FROM {} WHERE id = $1",
                table
            ))
            .bind(new_id)
            .fetch_one(state.db.pool())
            .await
            .map_err(|e| {
                (
                    StatusCode::INTERNAL_SERVER_ERROR,
                    Json(serde_json::json!({
                        "success": false, "error": format!("Failed to get current state: {}", e)
                    })),
                )
            })?;

            return Ok(Json(UndoResponse {
                success: true,
                identity_uuid: uuid_clean,
                undone_count: 1,
                current_state,
            }));
        }
    };

    // ── Normal PATCH undo flow (identity exists) ──

    // Get recent N history records (is_undone=false, only 'update')
    let history_records: Vec<(i64, serde_json::Value)> = sqlx::query_as(&format!(
        "SELECT id, before_snapshot FROM {} WHERE identity_id = $1 AND is_undone = false AND operation = 'update' ORDER BY created_at DESC LIMIT $2",
        history_table
    ))
    .bind(identity_id)
    .bind(steps as i64)
    .fetch_all(state.db.pool())
    .await
    .map_err(|e| {
        (
            StatusCode::INTERNAL_SERVER_ERROR,
            Json(serde_json::json!({
                "success": false, "error": format!("Failed to get history: {}", e)
            })),
        )
    })?;

    if history_records.is_empty() {
        return Err((
            StatusCode::BAD_REQUEST,
            Json(serde_json::json!({
                "success": false, "error": "No undo operations available"
            })),
        ));
    }

    // Apply the last before_snapshot
    let (_, last_before) = history_records.last().unwrap();
    let before = last_before.as_object().unwrap();

    // Restore identity from before_snapshot
    sqlx::query(&format!(
        "UPDATE {} SET name = $1, identity_type = $2, source = $3, status = $4, metadata = $5, tmdb_id = $6, tmdb_profile = $7 WHERE id = $8",
        table
    ))
    .bind(before.get("name").and_then(|v| v.as_str()).unwrap_or(""))
    .bind(before.get("identity_type").and_then(|v| v.as_str()))
    .bind(before.get("source").and_then(|v| v.as_str()))
    .bind(before.get("status").and_then(|v| v.as_str()))
    .bind(before.get("metadata").cloned().unwrap_or(serde_json::json!({})))
    .bind(before.get("tmdb_id").and_then(|v| v.as_i64()))
    .bind(before.get("tmdb_profile").and_then(|v| v.as_str()))
    .bind(identity_id)
    .execute(state.db.pool())
    .await
    .map_err(|e| {
        (
            StatusCode::INTERNAL_SERVER_ERROR,
            Json(serde_json::json!({
                "success": false, "error": format!("Failed to restore identity: {}", e)
            })),
        )
    })?;

    // Mark history records as undone
    for (history_id, _) in &history_records {
        sqlx::query(&format!(
            "UPDATE {} SET is_undone = true, undone_at = NOW() WHERE id = $1",
            history_table
        ))
        .bind(*history_id)
        .execute(state.db.pool())
        .await
        .map_err(|e| {
            (
                StatusCode::INTERNAL_SERVER_ERROR,
                Json(serde_json::json!({
                    "success": false, "error": format!("Failed to mark history as undone: {}", e)
                })),
            )
        })?;
    }

    // Sync identity.json
    let _ =
        crate::core::identity::storage::save_identity_file_by_pool(state.db.pool(), &uuid_clean)
            .await;

    // Update index if name changed
    let new_name = before.get("name").and_then(|v| v.as_str()).unwrap_or("");
    let _ = crate::core::identity::storage::update_index(&uuid_clean, new_name);

    // Get current state
    let current_state: serde_json::Value = sqlx::query_scalar(&format!(
        "SELECT jsonb_build_object('id', id, 'uuid', uuid::text, 'name', name, 'identity_type', identity_type, 'source', source, 'status', status, 'metadata', metadata, 'tmdb_id', tmdb_id, 'tmdb_profile', tmdb_profile) FROM {} WHERE id = $1",
        table
    ))
    .bind(identity_id)
    .fetch_one(state.db.pool())
    .await
    .map_err(|e| {
        (
            StatusCode::INTERNAL_SERVER_ERROR,
            Json(serde_json::json!({
                "success": false, "error": format!("Failed to get current state: {}", e)
            })),
        )
    })?;

    Ok(Json(UndoResponse {
        success: true,
        identity_uuid: uuid_clean,
        undone_count: history_records.len(),
        current_state,
    }))
}

#[derive(Debug, Deserialize)]
struct RedoRequest {
    steps: Option<usize>,
}

#[derive(Debug, Serialize)]
struct RedoResponse {
    success: bool,
    identity_uuid: String,
    redone_count: usize,
    current_state: serde_json::Value,
}

async fn redo_identity(
    State(state): State<crate::api::types::AppState>,
    Extension(_auth): Extension<crate::api::middleware::UserAuth>,
    Path(identity_uuid): Path<String>,
    Json(req): Json<RedoRequest>,
) -> Result<Json<RedoResponse>, (StatusCode, Json<serde_json::Value>)> {
    let uuid_clean = identity_uuid.replace('-', "");
    let steps = req.steps.unwrap_or(1).max(1);

    let table = crate::core::db::schema::table_name("identities");
    let history_table = crate::core::db::schema::table_name("identity_history");
    let face_table = crate::core::db::schema::table_name("face_detections");

    // Get identity_id
    let identity_id: i32 = sqlx::query_scalar(&format!(
        "SELECT id FROM {} WHERE REPLACE(uuid::text, '-', '') = $1",
        table
    ))
    .bind(&uuid_clean)
    .fetch_one(state.db.pool())
    .await
    .map_err(|e| {
        (
            StatusCode::INTERNAL_SERVER_ERROR,
            Json(serde_json::json!({
                "success": false, "error": format!("Identity not found: {}", e)
            })),
        )
    })?;

    // Check for delete redo first (identity was previously restored via undo)
    let delete_record: Option<(i64,)> = sqlx::query_as(&format!(
        "SELECT id FROM {} WHERE identity_id = $1 AND operation = 'delete' AND is_undone = true ORDER BY created_at DESC LIMIT 1",
        history_table
    ))
    .bind(identity_id)
    .fetch_optional(state.db.pool())
    .await
    .map_err(|e| {
        (
            StatusCode::INTERNAL_SERVER_ERROR,
            Json(serde_json::json!({
                "success": false, "error": format!("Failed to check delete redo: {}", e)
            })),
        )
    })?;

    if let Some((delete_history_id,)) = delete_record {
        // ── Delete redo: re-delete the identity ──
        let _ = crate::core::identity::storage::delete_identity_file(&uuid_clean);

        // Unbind all faces
        let _ = sqlx::query(&format!(
            "UPDATE {} SET identity_id = NULL WHERE identity_id = $1",
            face_table
        ))
        .bind(identity_id)
        .execute(state.db.pool())
        .await;

        // Delete identity
        sqlx::query(&format!("DELETE FROM {} WHERE id = $1", table))
            .bind(identity_id)
            .execute(state.db.pool())
            .await
            .map_err(|e| {
                (
                    StatusCode::INTERNAL_SERVER_ERROR,
                    Json(serde_json::json!({
                        "success": false, "error": format!("Failed to delete identity: {}", e)
                    })),
                )
            })?;

        // Mark delete history as no longer undone
        let _ = sqlx::query(&format!(
            "UPDATE {} SET is_undone = false, undone_at = NULL WHERE id = $1",
            history_table
        ))
        .bind(delete_history_id)
        .execute(state.db.pool())
        .await;

        return Ok(Json(RedoResponse {
            success: true,
            identity_uuid: uuid_clean,
            redone_count: 1,
            current_state: serde_json::json!({"deleted": true}),
        }));
    }

    // ── Normal PATCH redo flow ──

    // Get recent N history records (is_undone=true, operation='update')
    let history_records: Vec<(i64, serde_json::Value)> = sqlx::query_as(&format!(
        "SELECT id, after_snapshot FROM {} WHERE identity_id = $1 AND is_undone = true AND operation = 'update' ORDER BY created_at DESC LIMIT $2",
        history_table
    ))
    .bind(identity_id)
    .bind(steps as i64)
    .fetch_all(state.db.pool())
    .await
    .map_err(|e| {
        (
            StatusCode::INTERNAL_SERVER_ERROR,
            Json(serde_json::json!({
                "success": false, "error": format!("Failed to get history: {}", e)
            })),
        )
    })?;

    if history_records.is_empty() {
        return Err((
            StatusCode::BAD_REQUEST,
            Json(serde_json::json!({
                "success": false, "error": "No redo operations available"
            })),
        ));
    }

    // Apply the last after_snapshot
    let (_, last_after) = history_records.last().unwrap();
    let after = last_after.as_object().unwrap();

    // Restore identity from after_snapshot
    sqlx::query(&format!(
        "UPDATE {} SET name = $1, identity_type = $2, source = $3, status = $4, metadata = $5, tmdb_id = $6, tmdb_profile = $7 WHERE id = $8",
        table
    ))
    .bind(after.get("name").and_then(|v| v.as_str()).unwrap_or(""))
    .bind(after.get("identity_type").and_then(|v| v.as_str()))
    .bind(after.get("source").and_then(|v| v.as_str()))
    .bind(after.get("status").and_then(|v| v.as_str()))
    .bind(after.get("metadata").cloned().unwrap_or(serde_json::json!({})))
    .bind(after.get("tmdb_id").and_then(|v| v.as_i64()))
    .bind(after.get("tmdb_profile").and_then(|v| v.as_str()))
    .bind(identity_id)
    .execute(state.db.pool())
    .await
    .map_err(|e| {
        (
            StatusCode::INTERNAL_SERVER_ERROR,
            Json(serde_json::json!({
                "success": false, "error": format!("Failed to restore identity: {}", e)
            })),
        )
    })?;

    // Mark history records as not undone
    for (history_id, _) in &history_records {
        sqlx::query(&format!(
            "UPDATE {} SET is_undone = false, undone_at = NULL WHERE id = $1",
            history_table
        ))
        .bind(*history_id)
        .execute(state.db.pool())
        .await
        .map_err(|e| {
            (
                StatusCode::INTERNAL_SERVER_ERROR,
                Json(serde_json::json!({
                    "success": false, "error": format!("Failed to mark history as redone: {}", e)
                })),
            )
        })?;
    }

    // Sync identity.json
    let _ =
        crate::core::identity::storage::save_identity_file_by_pool(state.db.pool(), &uuid_clean)
            .await;

    // Update index if name changed
    let new_name = after.get("name").and_then(|v| v.as_str()).unwrap_or("");
    let _ = crate::core::identity::storage::update_index(&uuid_clean, new_name);

    // Get current state
    let current_state: serde_json::Value = sqlx::query_scalar(&format!(
        "SELECT jsonb_build_object('id', id, 'uuid', uuid::text, 'name', name, 'identity_type', identity_type, 'source', source, 'status', status, 'metadata', metadata, 'tmdb_id', tmdb_id, 'tmdb_profile', tmdb_profile) FROM {} WHERE id = $1",
        table
    ))
    .bind(identity_id)
    .fetch_one(state.db.pool())
    .await
    .map_err(|e| {
        (
            StatusCode::INTERNAL_SERVER_ERROR,
            Json(serde_json::json!({
                "success": false, "error": format!("Failed to get current state: {}", e)
            })),
        )
    })?;

    Ok(Json(RedoResponse {
        success: true,
        identity_uuid: uuid_clean,
        redone_count: history_records.len(),
        current_state,
    }))
}

#[derive(Debug, Deserialize)]
struct HistoryQuery {
    limit: Option<usize>,
    page: Option<usize>,
}

#[derive(Debug, Serialize)]
struct HistoryResponse {
    success: bool,
    identity_uuid: String,
    total: i64,
    undo_stack_count: i64,
    redo_stack_count: i64,
    results: Vec<HistoryItem>,
}

#[derive(Debug, Serialize)]
struct HistoryItem {
    history_id: i64,
    operation: String,
    is_undone: bool,
    created_at: Option<chrono::DateTime<chrono::Utc>>,
    undone_at: Option<chrono::DateTime<chrono::Utc>>,
}

async fn get_identity_history(
    State(state): State<crate::api::types::AppState>,
    Path(identity_uuid): Path<String>,
    Query(params): Query<HistoryQuery>,
) -> Result<Json<HistoryResponse>, (StatusCode, Json<serde_json::Value>)> {
    let uuid_clean = identity_uuid.replace('-', "");
    let limit = params.limit.unwrap_or(20).max(1).min(100);
    let page = params.page.unwrap_or(1).max(1);
    let offset = ((page - 1) * limit) as i64;

    let table = crate::core::db::schema::table_name("identities");
    let history_table = crate::core::db::schema::table_name("identity_history");

    // Get identity_id
    let identity_id: i32 = sqlx::query_scalar(&format!(
        "SELECT id FROM {} WHERE REPLACE(uuid::text, '-', '') = $1",
        table
    ))
    .bind(&uuid_clean)
    .fetch_one(state.db.pool())
    .await
    .map_err(|e| {
        (
            StatusCode::INTERNAL_SERVER_ERROR,
            Json(serde_json::json!({
                "success": false, "error": format!("Identity not found: {}", e)
            })),
        )
    })?;

    // Get counts
    let undo_stack_count: i64 = sqlx::query_scalar(&format!(
        "SELECT COUNT(*) FROM {} WHERE identity_id = $1 AND is_undone = false",
        history_table
    ))
    .bind(identity_id)
    .fetch_one(state.db.pool())
    .await
    .map_err(|e| {
        (
            StatusCode::INTERNAL_SERVER_ERROR,
            Json(serde_json::json!({
                "success": false, "error": format!("Failed to count undo stack: {}", e)
            })),
        )
    })?;

    let redo_stack_count: i64 = sqlx::query_scalar(&format!(
        "SELECT COUNT(*) FROM {} WHERE identity_id = $1 AND is_undone = true",
        history_table
    ))
    .bind(identity_id)
    .fetch_one(state.db.pool())
    .await
    .map_err(|e| {
        (
            StatusCode::INTERNAL_SERVER_ERROR,
            Json(serde_json::json!({
                "success": false, "error": format!("Failed to count redo stack: {}", e)
            })),
        )
    })?;

    // Get history records
    let rows = sqlx::query(&format!(
        "SELECT id, operation, is_undone, created_at, undone_at FROM {} WHERE identity_id = $1 ORDER BY created_at DESC LIMIT $2 OFFSET $3",
        history_table
    ))
    .bind(identity_id)
    .bind(limit as i64)
    .bind(offset)
    .fetch_all(state.db.pool())
    .await
    .map_err(|e| {
        (
            StatusCode::INTERNAL_SERVER_ERROR,
            Json(serde_json::json!({
                "success": false, "error": format!("Failed to get history: {}", e)
            })),
        )
    })?;

    let results: Vec<HistoryItem> = rows
        .into_iter()
        .map(|r| HistoryItem {
            history_id: r.get::<i64, _>("id"),
            operation: r.get::<String, _>("operation"),
            is_undone: r.get::<bool, _>("is_undone"),
            created_at: r.get::<Option<chrono::DateTime<chrono::Utc>>, _>("created_at"),
            undone_at: r.get::<Option<chrono::DateTime<chrono::Utc>>, _>("undone_at"),
        })
        .collect();

    let total = undo_stack_count + redo_stack_count;

    Ok(Json(HistoryResponse {
        success: true,
        identity_uuid: uuid_clean,
        total,
        undo_stack_count,
        redo_stack_count,
        results,
    }))
}