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use serde::{Deserialize, Serialize};
use std::path::Path;
use std::time::{SystemTime, UNIX_EPOCH};

#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct TaskProgress {
    pub story: String,
    pub story_id: String,
    pub story_path: String,
    pub step: String,
    pub progress: u32,
    pub narration: String,
    pub prompt: String,
    pub vfx: String,
    pub img: String,
    pub voc: String,
    pub core_version: String,
    pub timestamp: u64,
}

impl TaskProgress {
    pub fn new(story_id: String, story_path: String) -> Self {
        Self {
            story: story_id.clone(),
            story_id,
            story_path,
            step: "Initialisation".to_string(),
            progress: 0,
            narration: String::new(),
            prompt: String::new(),
            vfx: "grain".to_string(),
            img: "api".to_string(),
            voc: "api".to_string(),
            core_version: "Rust (Native)".to_string(),
            timestamp: current_timestamp(),
        }
    }

    pub fn update_step(&mut self, step: String, progress: u32) {
        self.step = step;
        self.progress = progress;
        self.timestamp = current_timestamp();
    }

    pub fn set_img(&mut self, img_mode: String) {
        self.img = img_mode;
    }

    pub fn set_voc(&mut self, voc_mode: String) {
        self.voc = voc_mode;
    }

    pub fn to_json(&self) -> Result<String, serde_json::Error> {
        serde_json::to_string(self)
    }
}

pub struct ProgressTracker {
    pub task_file: std::path::PathBuf,
    pub current: std::sync::Arc<tokio::sync::Mutex<TaskProgress>>,
}

impl ProgressTracker {
    pub fn new(task_file: impl AsRef<Path>, story_id: String, story_path: String) -> Self {
        Self {
            task_file: task_file.as_ref().to_path_buf(),
            current: std::sync::Arc::new(tokio::sync::Mutex::new(TaskProgress::new(story_id, story_path))),
        }
    }

    pub async fn update_task_status(&self, step: &str, progress_val: u32) -> anyhow::Result<()> {
        let mut lock = self.current.lock().await;
        lock.update_step(step.to_string(), progress_val);
        let json = lock.to_json()?;
        std::fs::write(&self.task_file, json)?;
        Ok(())
    }

    pub async fn set_img_mode(&self, mode: &str) -> anyhow::Result<()> {
        let mut lock = self.current.lock().await;
        lock.set_img(mode.to_string());
        let json = lock.to_json()?;
        std::fs::write(&self.task_file, json)?;
        Ok(())
    }

    pub async fn set_voc_mode(&self, mode: &str) -> anyhow::Result<()> {
        let mut lock = self.current.lock().await;
        lock.set_voc(mode.to_string());
        let json = lock.to_json()?;
        std::fs::write(&self.task_file, json)?;
        Ok(())
    }

    pub async fn set_vfx_mode(&self, mode: &str) -> anyhow::Result<()> {
        let mut lock = self.current.lock().await;
        lock.vfx = mode.to_string();
        let json = lock.to_json()?;
        std::fs::write(&self.task_file, json)?;
        Ok(())
    }

    pub fn write_progress(&self, progress: &TaskProgress) -> anyhow::Result<()> {
        let json = serde_json::to_string(progress)?;
        std::fs::write(&self.task_file, json)?;
        Ok(())
    }

    pub fn clear(&self) -> anyhow::Result<()> {
        if self.task_file.exists() {
            let _ = std::fs::remove_file(&self.task_file);
        }
        Ok(())
    }

    pub fn read_progress(&self) -> anyhow::Result<TaskProgress> {
        let json = std::fs::read_to_string(&self.task_file)?;
        let progress = serde_json::from_str(&json)?;
        Ok(progress)
    }
}

/// Vérifier si la production est en pause (via fichier de contrôle)
pub fn check_pause(pause_file: &Path) -> bool {
    pause_file.exists()
}

/// Attendre la fin de la pause (polling)
pub async fn wait_for_resume(pause_file: &Path) {
    while pause_file.exists() {
        tokio::time::sleep(std::time::Duration::from_secs(2)).await;
    }
}

fn current_timestamp() -> u64 {
    SystemTime::now()
        .duration_since(UNIX_EPOCH)
        .unwrap_or_default()
        .as_secs()
}

#[cfg(test)]
mod tests {
    use super::*;

    #[test]
    fn test_progress_creation() {
        let progress = TaskProgress::new("test_story".to_string(), "/path/to/story".to_string());
        assert_eq!(progress.story_id, "test_story");
        assert_eq!(progress.progress, 0);
        assert_eq!(progress.img, "api");
        assert_eq!(progress.voc, "api");
    }

    #[test]
    fn test_progress_json_serialization() -> Result<(), serde_json::Error> {
        let mut progress = TaskProgress::new("test".to_string(), "/path".to_string());
        progress.set_img("local".to_string());
        progress.set_voc("edge-tts".to_string());
        let json_str = progress.to_json()?;
        assert!(json_str.contains("test"));
        assert!(json_str.contains("local"));
        assert!(json_str.contains("edge-tts"));
        Ok(())
    }

    #[tokio::test]
    async fn test_progress_tracker_updates() -> anyhow::Result<()> {
        let tmp_file = std::env::temp_dir().join("test_progress.json");
        let tracker = ProgressTracker::new(&tmp_file, "story_test".to_string(), "/test".to_string());
        
        tracker.update_task_status("In progress", 50).await?;
        let read = tracker.read_progress()?;
        assert_eq!(read.progress, 50);
        assert_eq!(read.step, "In progress");

        tracker.set_img_mode("ssd-1b").await?;
        let read = tracker.read_progress()?;
        assert_eq!(read.img, "ssd-1b");

        tracker.set_voc_mode("elevenlabs").await?;
        let read = tracker.read_progress()?;
        assert_eq!(read.voc, "elevenlabs");

        std::fs::remove_file(tmp_file)?;
        Ok(())
    }
}