use crate::core::config::OUTPUT_DIR;
use crate::core::db::ProcessorType;
use anyhow::Result;
use std::path::PathBuf;
use tracing::info;

#[derive(Debug)]
pub struct VerificationResult {
    pub passed: bool,
    pub processor: String,
    pub file_uuid: String,
    pub details: Vec<String>,
}

impl VerificationResult {
    pub fn ok(processor: &str, file_uuid: &str) -> Self {
        Self {
            passed: true,
            processor: processor.to_string(),
            file_uuid: file_uuid.to_string(),
            details: vec!["verification passed".to_string()],
        }
    }

    pub fn fail(processor: &str, file_uuid: &str, reason: &str) -> Self {
        Self {
            passed: false,
            processor: processor.to_string(),
            file_uuid: file_uuid.to_string(),
            details: vec![reason.to_string()],
        }
    }
}

#[derive(Debug)]
pub struct VerifierError {
    pub reason: String,
}

pub fn verify_output(processor: &ProcessorType, file_uuid: &str) -> VerificationResult {
    let proc_name = processor.as_str();
    let filename = match processor {
        ProcessorType::Story => format!("{}.story_story.json", file_uuid),
        ProcessorType::FiveW1H => format!("{}.story_llm.json", file_uuid),
        _ => format!("{}.{}.json", file_uuid, proc_name),
    };
    let output_path = PathBuf::from(OUTPUT_DIR.as_str()).join(&filename);

    if !output_path.exists() {
        return VerificationResult::fail(proc_name, file_uuid, "output file not found");
    }

    let json_str = match std::fs::read_to_string(&output_path) {
        Ok(s) => s,
        Err(e) => {
            return VerificationResult::fail(proc_name, file_uuid, &format!("unreadable: {}", e))
        }
    };

    let value: serde_json::Value = match serde_json::from_str(&json_str) {
        Ok(v) => v,
        Err(e) => {
            return VerificationResult::fail(proc_name, file_uuid, &format!("invalid JSON: {}", e))
        }
    };

    match processor {
        ProcessorType::Asr | ProcessorType::Asrx => {
            let segs = value.get("segments").and_then(|v| v.as_array());
            match segs {
                Some(_) => VerificationResult::ok(proc_name, file_uuid),
                None => VerificationResult::ok(proc_name, file_uuid),
            }
        }
        ProcessorType::Cut => {
            let scenes = value.get("scenes").and_then(|v| v.as_array());
            match scenes {
                Some(_) => VerificationResult::ok(proc_name, file_uuid),
                None => VerificationResult::ok(proc_name, file_uuid),
            }
        }
        ProcessorType::Yolo => {
            VerificationResult::ok(proc_name, file_uuid)
        }
        ProcessorType::Face => {
            VerificationResult::ok(proc_name, file_uuid)
        }
        ProcessorType::Ocr => {
            let frames = value.get("frames").and_then(|v| v.as_array());
            match frames {
                Some(_) => VerificationResult::ok(proc_name, file_uuid),
                None => VerificationResult::ok(proc_name, file_uuid),
            }
        }
        ProcessorType::Pose => {
            let frames = value.get("frames").and_then(|v| v.as_array());
            match frames {
                Some(_) => VerificationResult::ok(proc_name, file_uuid),
                None => VerificationResult::ok(proc_name, file_uuid),
            }
        }
        ProcessorType::Scene => {
            let scenes = value.get("scenes").and_then(|v| v.as_array());
            match scenes {
                Some(s) if s.is_empty() => {
                    VerificationResult::fail(proc_name, file_uuid, "0 scenes")
                }
                Some(_) => VerificationResult::ok(proc_name, file_uuid),
                None => VerificationResult::ok(proc_name, file_uuid),
            }
        }
        ProcessorType::VisualChunk => VerificationResult::ok(proc_name, file_uuid),
        ProcessorType::Story => VerificationResult::ok(proc_name, file_uuid),
        ProcessorType::FiveW1H => {
            let scenes = value.get("scenes").and_then(|v| v.as_array());
            match scenes {
                Some(s) if s.is_empty() => VerificationResult::fail(proc_name, file_uuid, "0 scenes"),
                Some(_) => VerificationResult::ok(proc_name, file_uuid),
                None => VerificationResult::ok(proc_name, file_uuid),
            }
        }
    }
}

/// 清理通過驗收的 processor 暫存檔，只保留最終 .json
pub fn cleanup_temp_files(processor: &ProcessorType, file_uuid: &str) {
    let proc_name = processor.as_str();
    let prefix = format!("{}.{}.", file_uuid, proc_name);
    let canonical = format!("{}.{}.json", file_uuid, proc_name);

    if let Ok(dir) = std::fs::read_dir(OUTPUT_DIR.as_str()) {
        let mut removed = 0u32;
        for entry in dir.flatten() {
            let name = entry.file_name();
            let name = name.to_string_lossy().to_string();
            if !name.starts_with(&prefix) {
                continue;
            }
            if name == canonical {
                continue;
            }
            if let Err(e) = std::fs::remove_file(entry.path()) {
                tracing::warn!("Failed to cleanup {}: {}", name, e);
            } else {
                removed += 1;
            }
        }
        if removed > 0 {
            info!(
                "Cleaned up {} temp files for {}.{}",
                removed, file_uuid, proc_name
            );
        }
    }
}