use anyhow::{Context, Result};
use tracing::{info, warn};

use crate::core::db::{
    workspace_sqlite::{SpeakerDetectionBatchItem, WorkspaceDb},
    PostgresDb, QdrantDb, QdrantWorkspace,
};

#[derive(Debug)]
pub struct CheckinResult {
    pub file_uuid: String,
    pub pre_chunks_moved: usize,
    pub speaker_detections_moved: usize,
    pub vectors_moved: usize,
}

#[derive(Debug)]
pub struct CheckoutResult {
    pub file_uuid: String,
    pub rows_deleted: usize,
}

pub async fn checkin(db: &PostgresDb, file_uuid: &str) -> Result<CheckinResult> {
    let schema = crate::core::config::DATABASE_SCHEMA.as_str();
    info!("Checkin starting for {} (schema={})", file_uuid, schema);

    let workspace = WorkspaceDb::open(file_uuid)
        .await
        .context("No workspace found for checkin")?;
    let qdrant_ws = QdrantWorkspace::new();

    let pre_chunks = workspace.get_all_pre_chunks().await?;
    let spk_dets = workspace.get_all_speaker_detections().await?;

    info!(
        "Checkin {} workspace: {} pre_chunks, {} spk_dets",
        file_uuid,
        pre_chunks.len(),
        spk_dets.len(),
    );

    // ── Pre-chunks ──
    for chunk in &pre_chunks {
        let data_value: serde_json::Value = chunk
            .data
            .as_ref()
            .and_then(|d| serde_json::from_str(d).ok())
            .unwrap_or(serde_json::Value::Null);

        match chunk.processor_type.as_str() {
            "asr" => {
                let start = chunk.start_time.unwrap_or(0.0);
                let end = chunk.end_time.unwrap_or(0.0);
                let sf = chunk.start_frame.unwrap_or(0);
                let ef = chunk.end_frame.unwrap_or(0);
                let idx = chunk.id as i64;
                db.store_asr_pre_chunks_batch(file_uuid, &[(idx, sf, ef, start, end, data_value)])
                    .await?;
            }
            "cut" => {
                let start = chunk.start_time.unwrap_or(0.0);
                let end = chunk.end_time.unwrap_or(0.0);
                let sf = chunk.start_frame.unwrap_or(0);
                let ef = chunk.end_frame.unwrap_or(0);
                let idx = chunk.id as i64;
                db.store_cut_pre_chunks_batch(file_uuid, &[(idx, sf, ef, start, end, data_value)])
                    .await?;
            }
            "scene" => {
                let start = chunk.start_time.unwrap_or(0.0);
                let end = chunk.end_time.unwrap_or(0.0);
                let sf = chunk.start_frame.unwrap_or(0);
                let ef = chunk.end_frame.unwrap_or(0);
                let idx = chunk.id as i64;
                db.store_scene_pre_chunks_batch(
                    file_uuid,
                    &[(idx, sf, ef, start, end, data_value)],
                )
                .await?;
            }
            _ => {
                let frame = chunk.start_frame.unwrap_or(0);
                let ts = chunk.start_time;
                let text = chunk.text_content.clone();
                db.store_raw_pre_chunks_batch(
                    file_uuid,
                    &chunk.processor_type,
                    &[(frame, ts, data_value, text, None)],
                )
                .await?;
            }
        }
    }

    // ── Speaker detections ──
    if !spk_dets.is_empty() {
        let batch: Vec<(String, f64, f64, String, Option<String>, f32)> = spk_dets
            .iter()
            .map(|s| {
                (
                    s.speaker_id.clone().unwrap_or_default(),
                    s.start_time.unwrap_or(0.0),
                    s.end_time.unwrap_or(0.0),
                    s.text_content.clone().unwrap_or_default(),
                    s.chunk_id.clone(),
                    s.confidence.unwrap_or(0.0) as f32,
                )
            })
            .collect();
        db.store_speaker_detections_batch(file_uuid, &batch).await?;
    }

    // ── Qdrant vectors ──
    let mut vectors_moved = 0usize;
    match qdrant_ws.scroll_by_file_uuid(file_uuid).await {
        Ok(ws_data) => {
            let qdrant = QdrantDb::new();

            // Chunks → production collection
            for point in &ws_data.chunks {
                if let Some(ref vector) = point.vector {
                    let payload_val: serde_json::Value =
                        serde_json::to_value(&point.payload).unwrap_or(serde_json::Value::Null);
                    let point_id: u64 = match point.id.parse::<u64>() {
                        Ok(id) => id,
                        Err(_) => {
                            use std::hash::{Hash, Hasher};
                            let mut hasher = std::collections::hash_map::DefaultHasher::new();
                            point.id.hash(&mut hasher);
                            hasher.finish()
                        }
                    };
                    if let Err(e) = qdrant
                        .upsert_vector_to_collection(
                            &qdrant.collection_name,
                            point_id,
                            vector,
                            Some(payload_val),
                        )
                        .await
                    {
                        warn!("Failed to checkin chunk vector {}: {}", point.id, e);
                    } else {
                        vectors_moved += 1;
                    }
                }
            }

            // Traces → production traces collection
            let traces_coll = format!(
                "{}_traces",
                crate::core::config::REDIS_KEY_PREFIX
                    .as_str()
                    .trim_end_matches(':')
            );
            for point in &ws_data.traces {
                if let Some(ref vector) = point.vector {
                    let payload_val: serde_json::Value =
                        serde_json::to_value(&point.payload).unwrap_or(serde_json::Value::Null);
                    let point_id: u64 = match point.id.parse::<u64>() {
                        Ok(id) => id,
                        Err(_) => {
                            use std::hash::{Hash, Hasher};
                            let mut hasher = std::collections::hash_map::DefaultHasher::new();
                            point.id.hash(&mut hasher);
                            hasher.finish()
                        }
                    };
                    if let Err(e) = qdrant
                        .upsert_vector_to_collection(
                            &traces_coll,
                            point_id,
                            vector,
                            Some(payload_val),
                        )
                        .await
                    {
                        warn!("Failed to checkin trace vector {}: {}", point.id, e);
                    } else {
                        vectors_moved += 1;
                    }
                }
            }
        }
        Err(e) => {
            warn!("Failed to scroll Qdrant workspace for {}: {}", file_uuid, e);
        }
    }

    // ── Cleanup workspace ──
    if let Err(e) = workspace.clear().await {
        warn!("Failed to clear workspace for {}: {}", file_uuid, e);
    }
    if let Err(e) = qdrant_ws.delete_by_file_uuid(file_uuid).await {
        warn!(
            "Failed to delete workspace vectors for {}: {}",
            file_uuid, e
        );
    }

    info!(
        "Checkin complete for {}: {} pre_chunks, {} spk_dets, {} vectors",
        file_uuid,
        pre_chunks.len(),
        spk_dets.len(),
        vectors_moved,
    );

    Ok(CheckinResult {
        file_uuid: file_uuid.to_string(),
        pre_chunks_moved: pre_chunks.len(),
        speaker_detections_moved: spk_dets.len(),
        vectors_moved,
    })
}

pub async fn checkout(db: &PostgresDb, file_uuid: &str) -> Result<CheckoutResult> {
    let schema = crate::core::config::DATABASE_SCHEMA.as_str();
    let table = crate::core::db::schema::table_name;
    info!("Checkout starting for {} (schema={})", file_uuid, schema);

    // Delete face_detections
    let face_table = table("face_detections");
    let face_result = sqlx::query(&format!("DELETE FROM {} WHERE file_uuid = $1", face_table))
        .bind(file_uuid)
        .execute(db.pool())
        .await?;
    info!(
        "Checkout {}: deleted {} rows from {}",
        file_uuid,
        face_result.rows_affected(),
        face_table
    );

    // Delete speaker_detections
    let spk_table = table("speaker_detections");
    let spk_result = sqlx::query(&format!("DELETE FROM {} WHERE file_uuid = $1", spk_table))
        .bind(file_uuid)
        .execute(db.pool())
        .await?;
    info!(
        "Checkout {}: deleted {} rows from {}",
        file_uuid,
        spk_result.rows_affected(),
        spk_table
    );

    // Delete pre_chunks
    let pc_table = table("pre_chunks");
    let pc_result = sqlx::query(&format!("DELETE FROM {} WHERE file_uuid = $1", pc_table))
        .bind(file_uuid)
        .execute(db.pool())
        .await?;
    info!(
        "Checkout {}: deleted {} rows from {}",
        file_uuid,
        pc_result.rows_affected(),
        pc_table
    );

    // Delete chunks
    let chunk_table = table("chunk");
    let chunk_result = sqlx::query(&format!("DELETE FROM {} WHERE file_uuid = $1", chunk_table))
        .bind(file_uuid)
        .execute(db.pool())
        .await?;
    info!(
        "Checkout {}: deleted {} rows from {}",
        file_uuid,
        chunk_result.rows_affected(),
        chunk_table
    );

    // Delete processor_results
    let pr_table = table("processor_results");
    let pr_result = sqlx::query(&format!("DELETE FROM {} WHERE file_uuid = $1", pr_table))
        .bind(file_uuid)
        .execute(db.pool())
        .await?;
    info!(
        "Checkout {}: deleted {} rows from {}",
        file_uuid,
        pr_result.rows_affected(),
        pr_table
    );

    // Delete Qdrant vectors from production
    let qdrant = QdrantDb::new();

    if let Err(e) = qdrant.delete_by_uuid(file_uuid).await {
        warn!(
            "Failed to delete chunk vectors from Qdrant for {}: {}",
            file_uuid, e
        );
    }

    let prefix = crate::core::config::REDIS_KEY_PREFIX
        .as_str()
        .trim_end_matches(':');
    let traces_coll = format!("{}_traces", prefix);
    let voice_coll = format!("{}_voice", file_uuid);

    for coll in &[traces_coll, voice_coll] {
        if let Err(e) = QdrantDb::delete_by_uuid_from_collection(
            &qdrant.client,
            &qdrant.base_url,
            &qdrant.api_key,
            coll,
            file_uuid,
        )
        .await
        {
            warn!(
                "Failed to delete vectors from {} for {}: {}",
                coll, file_uuid, e
            );
        }
    }

    let rows_deleted = face_result.rows_affected()
        + spk_result.rows_affected()
        + pc_result.rows_affected()
        + chunk_result.rows_affected()
        + pr_result.rows_affected();

    info!(
        "Checkout complete for {}: {} PG rows deleted",
        file_uuid, rows_deleted,
    );

    Ok(CheckoutResult {
        file_uuid: file_uuid.to_string(),
        rows_deleted: rows_deleted as usize,
    })
}