const fs = require('fs');
const path = require('path');
const { execSync } = require('child_process');
const serverError = require('../utils/serverError');

async function createVideo(projectId) {
   const imageDir = `/storage/${projectId}`;
   const outputVideo = `/storage/${projectId}/videos/output_video.mp4`;
   const frameRate = 24;
   const tempFile = `/storage/${projectId}/temp_file.txt`;

   try {
      const images = fs.readdirSync(imageDir).filter(file => file.endsWith('.jpg'));
      if (images.length === 0) {
         throw new Error('No images found for this project');
      }

      const tempFileContent = images.map(img => `file '${path.join(imageDir, img)}'`).join('\n');
      fs.writeFileSync(tempFile, tempFileContent);

      const ffmpegCommand = `ffmpeg -r ${frameRate} -f concat -safe 0 -i ${tempFile} -vsync vfr -pix_fmt yuv420p ${outputVideo}`;
      execSync(ffmpegCommand);

      fs.unlinkSync(tempFile);
      return { message: 'Video created successfully', videoPath: outputVideo };
   } catch (error) {
      throw new Error(`Error creating video: ${error.message}`);
   }
}

module.exports = { createVideo };