const express = require('express');
const Queue = require('bull');
const { spawn } = require('child_process');
const fs = require('fs');
const path = require('path');
const cors = require('cors');
const EventEmitter = require('events');
const softwareService = require('./services/softwares');

const BASE_PATH = process.env.DATA_PATH || `./data`;
const OUTPUT_PATH = `${BASE_PATH}/output`;
const TMP_PATH = `${BASE_PATH}/tmp`;

const app = express();
const port = 3000;

app.use(cors());
app.use(express.json());

const videoQueue = new Queue('crawlflix_queue', 'redis://192.168.1.222:32768');

videoQueue.on('error', (e) => {
	console.log('An error occured', e);
});

const runCommand = (command) => {
	console.log('⚙️  Will execute: ' + command);
	return new Promise((resolve, reject) => {
		const cmd = spawn(command, { shell: true });
		let lastLog = '';

		cmd.stdout.on('data', (data) => {
			lastLog = data.toString();
			process.stdout.write(data.toString());
		});

		cmd.stderr.on('data', (data) => {
			lastLog = data.toString();
			process.stderr.write(`stderr: ${data.toString()}`);
		});

		cmd.on('close', (code) => {
			if (code === 0) {
				resolve('Command executed successfully.');
			} else {
				reject(lastLog || 'Command failed with status code ' + code);
			}
		});
	});
};

const runProgressCommand = (command) => {
    console.log('⚙️  Will execute: ' + command);
    const emitter = new EventEmitter();

    const executeCommand = new Promise((resolve, reject) => {
        const cmd = spawn(command, { shell: true });
        let lastLog = '';

        cmd.stdout.on('data', (data) => {
        	lastLog = data.toString();
            const perc = extractPercentage(data.toString());
            if (!perc) {
                process.stdout.write(data.toString());
            } else {
                emitter.emit('percentage', perc);
            }
        });

        cmd.stderr.on('data', (data) => {
        	lastLog = data.toString();
            process.stderr.write(`stderr: ${data.toString()}`);
        });

        cmd.on('close', (code) => {
           	if (code === 0) {
				resolve('Command executed successfully.');
			} else {
				reject(lastLog || 'Command failed with status code ' + code);
			}
        });
    });

    return { executeCommand, emitter };
};

// Route pour démarrer le processus
app.post('/start-process', async (req, res, next) => {
	try {
		const { mp4Filename, mpdUrl, keys, wantedResolution } = req.body;
		console.log(req.body);
		const job = await videoQueue.add({
			mp4Filename,
			mpdUrl,
			keys,
			wantedResolution
		});
		res.json({ jobId: job.id });
	} catch(e) {
		console.log(e);
		next();
	}
});

// Route pour vérifier le statut du job
app.get('/job-status/:jobId', async (req, res) => {
	const job = await videoQueue.getJob(req.params.jobId);
	if (job === null) {
		res.status(404).json({ error: 'Job not found' });
	} else {
		const state = await job.getState();
		const progress = job._progress;
		res.json({ jobId: job.id, state, progress });
	}
});

app.get('/jobs-status', async (req, res) => {
	const jobs = await videoQueue.getJobs();
	res.json(await Promise.all(jobs.splice(0, 25).map(async job => ({
		id: job.id,
		state: await job.getState(),
		progress: job._progress,
		addedOn: job.timestamp,
		processedOn: job.processedOn,
		finishedOn: job.finishedOn,
		returnValue: job.returnvalue,
		failedReason: job.failedReason,
		data: job.data
	}))));
});

app.get('/download/:filename', async (req, res) => {
	const { filename } = req.params;
	const file = path.join(process.cwd(), filename);
	res.download(file);
});

app.get('/hello', async (req, res, next) => {
	try {
		res.json({
			downloader: await softwareService.checkDownloaderUpdate(),
			mp4decrypt: await softwareService.checkMp4decryptUpdate()
		})
	} catch(e) {
		console.log(e);
		next(e);
	}
});

app.post('/processUpdate', async (req, res, next) => {
	try {
		console.log(req.body);
		await softwareService.processUpdate(req.body);
		res.end();
	} catch(e) {
		console.log(e);
		next(e);
	}
});

const checkFilesExistance = (pattern, path) => {
	return new Promise(async (resolve, reject) => {
		try {
			const files = fs.readdirSync(path);
			resolve(files.filter(file => file.includes(pattern)));
		} catch(e) {
			reject(e);
		}
	});
};

const extractPercentage = (line) => {
	const s = line.split('%');
	const percentages = [];

	for (let i = 0; i < s.length; i++) {
		if (s[i].length === 0) continue;
		const ss = s[i].split(' ');
		if (ss.length > 0 && !isNaN(ss[ss.length - 1]))
			percentages.push(parseFloat(ss[ss.length - 1]));
	}
	if (percentages.length === 0) return null;
	return Math.max(...percentages.filter((p) => p < 100));
}

// Processus de la file d'attente
videoQueue.process((job) => {
	return new Promise(async (resolve, reject) => {
		try {
			const { mp4Filename, mpdUrl, keys, wantedResolution } = job.data;
			const downloaderPath = softwareService.getLocalBinFileInfo('downloader').path;
			const mp4decryptPath = softwareService.getLocalBinFileInfo('mp4decrypt').path;
			const mp4TmpFilepath = path.join(TMP_PATH, `${mp4Filename}.mp4`);
			const mp4FinalFilepath = path.join(OUTPUT_PATH, `${mp4Filename}.mp4`);
			console.log('1')
			const filesExist = await checkFilesExistance('encrypted', TMP_PATH);
			console.log('2')
			if (filesExist.length === 0) {
				const resPattern = {
					'4k': [3840, 2160],
					'1080p': [1920, 1080],
					'720p': [1280, 720],
					'480p': [854, 480],
					'360p': [640, 360],
					'240p': [426, 240]
				}[wantedResolution] || [1920, 1080];
				console.log('Encrypted files not found, downloading...');
			 	job.progress(10);
				const { executeCommand, emitter } = runProgressCommand(`${downloaderPath} \"${mpdUrl}\" --save-name ${mp4TmpFilepath}_encrypted --select-video \"(?=.*${resPattern[0]})(?=.*${resPattern[1]})\" --select-audio lang=\"fr|en\":for=best2 --select-subtitle all`, true);
				emitter.on('percentage', (percentage) => {
					console.log(`Download Progression : ${percentage}%`);
					job.progress(Math.round(10 + (percentage / 5)));
				});
				await executeCommand;
			} else {
				console.log('Encrypted files already exist, bypassing download...')
			}

			job.progress(30);

		// Décryptage vidéo
			await runCommand(`${mp4decryptPath} ${keys.map(k => `--key ${k.key}:${k.value}`).join(' ')} "${mp4TmpFilepath}_encrypted.mp4" "${mp4TmpFilepath}_decrypted.mp4"`);

			job.progress(50);

		// Décryptage audio
			const audioFiles = fs.readdirSync(mp4TmpFilepath);
			const finalAudio = [];
			for (const file of audioFiles) {
				if (file.startsWith(`${mp4TmpFilepath}_encrypted`) && file.endsWith('.m4a')) {
					const baseName = path.basename(file, '.m4a');
					await runCommand(`${mp4decryptPath} ${keys.map(k => `--key ${k.key}:${k.value}`).join(' ')} "${file}" "${baseName}_decrypted.m4a"`);
					finalAudio.push(`${baseName}_decrypted.m4a`);
				}
			}

			job.progress(70);

		// Combinaison avec ffmpeg
			let ffmpegCommand = `ffmpeg -y -i ${mp4TmpFilepath}_decrypted.mp4`;
			let mapCommand = ' -map 0:v';
			let inputIndex = 1;

			for (const file of finalAudio) {
				//if (file.startsWith(`${mp4Filename}_encrypted`) && file.endsWith('_decrypted.m4a')) {
					ffmpegCommand += ` -i ${file}`;
					mapCommand += ` -map ${inputIndex}:a`;
					inputIndex++;
				//}
			}

			ffmpegCommand += `${mapCommand} -c copy ${mp4FinalFilepath}.mp4`;
			await runCommand(ffmpegCommand);

			job.progress(90);

		// Renommage des fichiers SRT
			let counter = 1;
			for (const file of audioFiles) {
				if (file.startsWith(`${mp4TmpFilepath}_encrypted`) && file.endsWith('.srt')) {
					fs.renameSync(file, `${mp4FinalFilepath}_${counter}.srt`);
					counter++;
				}
			}

		// Nettoyage (commenté pour correspondre au script original)
			await runCommand(`rm ${mp4TmpFilepath}_encrypted* && rm ${mp4TmpFilepath}_decrypted*`);

			job.progress(100);
			resolve({ message: `File fetched and decrypted with success: ${mp4Filename}.mp4`, filePath: `${mp4FinalFilepath}.mp4`, fileName: `${mp4Filename}.mp4` });
		} catch (error) {
			console.log('Error while processing task', error)
			reject(new Error(`${error.toString() || error}`));
		}
	});
});

app.listen(port, () => {
	console.log(`Server running at http://localhost:${port}`);
	const dirsToCheck = [{
		path: BASE_PATH,
		name: 'data'
	}, {
		path: OUTPUT_PATH,
		name: 'output'
	}, {
		path: TMP_PATH,
		name: 'tmp'
	}];

	for (let i = 0; i < dirsToCheck.length; i++) {
		const dir = dirsToCheck[i];
		if (!fs.existsSync(dir.path)) {
			console.log(`Creating ${dir.name} directory...`);
			fs.mkdirSync(dir.path);
		}
	}
	
	softwareService.init();

});