const fs = require('fs');
const path = require('path');
const { spawn } = require('child_process');

const database_manager = require('../database/database_manager');

const PROJECTS_DIR = path.join('.');

async function createVideoWithList(projectId, pathList, duration, videoId, res_width, res_height) {
   const tempFile = path.join('temp.txt');
   let ffmpegProcess;
   let cleanupDone = false;

   try {
       // Configuration des chemins
       const workdir = path.join(PROJECTS_DIR, 'storage', projectId.toString());
       if (!fs.existsSync(workdir)) {
           fs.mkdirSync(workdir, { recursive: true });
       }

       // Tri des images
       const sortedImages = pathList.sort((a, b) => {
           const numA = parseInt(path.basename(a).match(/\d+/)[0], 10);
           const numB = parseInt(path.basename(b).match(/\d+/)[0], 10);
           return numA - numB;
       });

       // Création du fichier temporaire
       fs.writeFileSync(tempFile, sortedImages.map(image => `file '${image}'`).join('\n'));

       // Calcul des paramètres vidéo
       const totalFrames = sortedImages.length;
       const frameRate = Math.ceil(totalFrames / parseInt(duration));
       const timestamp = Date.now();
       const firstImageId = path.basename(sortedImages[0]).match(/\d+/)[0];
       const lastImageId = path.basename(sortedImages[sortedImages.length - 1]).match(/\d+/)[0];
       const outputVideo = path.join(
           workdir,
           `${projectId}_${firstImageId}_${lastImageId}-${timestamp}.mp4`
       );

       // Mise à jour initiale de la base de données
       let edit_video = {
              status: 3,
                progress: 0,
                started_at: new Date(),
                updated_at: new Date(),
                eta: null
       }
       await database_manager.video.edit_video_by_id(videoId, edit_video)
       const scale = res_width && res_height ? `scale=${res_width}:${res_height}` : 'scale=854:480'; // Redimensionne la vidéo en 480p par défaut

       // Configuration de FFmpeg
       const ffmpegArgs = [
           '-y',
           '-r', frameRate.toString(),
           '-f', 'concat',
           '-safe', '0',
           '-i', tempFile,
           '-vsync', 'vfr',
           '-pix_fmt', 'yuv420p',
           '-vf', scale,
           '-b:v', '1500k', // Force un bitrate vidéo de 1500 kbps (ajuste si nécessaire)
           outputVideo
       ];

       ffmpegProcess = spawn('ffmpeg', ffmpegArgs, { 
           stdio: ['ignore', 'ignore', 'pipe'] 
       });

       let lastUpdate = 0;
       const startTime = Date.now();

       // Écoute de la sortie d'erreur pour la progression
       ffmpegProcess.stderr.on('data', (data) => {
           const output = data.toString();
           const frameMatch = output.match(/frame=\s*(\d+)/);
           
           if (frameMatch) {
               const currentFrame = parseInt(frameMatch[1], 10);
               const progress = Math.min((currentFrame / totalFrames) * 100, 99.99);
               const now = Date.now();
               
               // Calcul de l'ETA
               const elapsedSeconds = (now - startTime) / 1000;
               const eta = elapsedSeconds / (currentFrame / totalFrames) - elapsedSeconds;

               // Mise à jour max toutes les 500ms
               if (now - lastUpdate > 500) {
                    let update_video = {
                        progress: progress,
                        eta: Math.round(eta),
                        updated_at: new Date()
                    }
                    database_manager.video.edit_video_by_id(videoId, update_video)
                   
                   console.log('Progress:', progress.toFixed(2), '%, ETA:', eta.toFixed(0), 's');
                   lastUpdate = now;
               }
           }
       });

       // Attente de la fin du processus
       await new Promise((resolve, reject) => {
           ffmpegProcess.on('close', async (code) => {
               if (code === 0) {
                   try {
                       // Mise à jour finale
                    //    await db.query(`
                    //        UPDATE public.videos 
                    //        SET 
                    //            status = 1, 
                    //            progress = 100, 
                    //            eta = 0, 
                    //            video_file = $1, 
                    //            updated_at = NOW() 
                    //        WHERE id = $2
                    //    `, [outputVideo, videoId]);
                        let latest_update = {
                            status: 1,
                            progress: 100,
                            eta: 0,
                            video_file: outputVideo,
                            updated_at: new Date()
                        }
                        await database_manager.video.edit_video_by_id(videoId, latest_update)
                       resolve();
                   } catch (e) {
                       reject(e);
                   }
               } else {
                   reject(new Error(`FFmpeg process exited with code ${code}`));
               }
           });

           ffmpegProcess.on('error', reject);
       });

       return outputVideo;

   } catch (error) {
       // Gestion des erreurs
       console.error('Error in video creation:', error);
       
       try {
              // Mise à jour de la base de données en cas d'erreur
              let error_video = {
                status: 0,
                progress: 0,
                eta: null,
                updated_at: new Date()
              }
              await database_manager.video.edit_video_by_id(videoId, error_video)
       } catch (dbError) {
           console.error('Database update error:', dbError);
       }
       
       throw error;

   } finally {
       // Nettoyage
       if (!cleanupDone) {
           if (tempFile && fs.existsSync(tempFile)) {
               fs.unlinkSync(tempFile);
           }
           if (ffmpegProcess) {
               ffmpegProcess.kill();
           }
           cleanupDone = true;
       }
   }
}

module.exports = { createVideoWithList };