const { createProxyMiddleware } = require('http-proxy-middleware');
const path = require('path');
const fs   = require('fs');

/**
 * Development proxy (CRA - only active with `npm start`).
 *
 * .env / .env.local:
 *   REACT_APP_CORE_URL=https://restreamer.nextream.sytes.net
 *   REACT_APP_YTDLP_URL=http://192.168.1.20:8282
 *   REACT_APP_FB_SERVER_URL=http://localhost:3002   (optional, default shown)
 */
const CORE_TARGET      = process.env.REACT_APP_CORE_URL      || 'http://localhost:8080';
const YTDLP_TARGET     = process.env.REACT_APP_YTDLP_URL     || 'http://localhost:8282';
const FB_SERVER_TARGET = process.env.REACT_APP_FB_SERVER_URL || 'http://localhost:3002';

console.log('\n[setupProxy] ─────────────────────────────────────');
console.log(`[setupProxy] Core      → ${CORE_TARGET}`);
console.log(`[setupProxy] yt-dlp    → ${YTDLP_TARGET}`);
console.log(`[setupProxy] fb-server → ${FB_SERVER_TARGET}`);
console.log('[setupProxy] ─────────────────────────────────────\n');

let coreUrl;
try {
	coreUrl = new URL(CORE_TARGET);
} catch (e) {
	console.error(`[setupProxy] Invalid REACT_APP_CORE_URL: "${CORE_TARGET}"`);
	coreUrl = new URL('http://localhost:8080');
}

// Shared proxy instance for all Core paths (/api, /memfs, /diskfs)
const coreProxy = createProxyMiddleware({
	target: CORE_TARGET,
	changeOrigin: true,
	secure: false,
	ws: false,
	onProxyReq: (proxyReq) => {
		proxyReq.setHeader('Host', coreUrl.host);
	},
	onError: (err, req, res) => {
		console.error(`[setupProxy] Core proxy error: ${err.code} — ${err.message}`);
		if (!res.headersSent) {
			res.writeHead(502, { 'Content-Type': 'application/json' });
			res.end(JSON.stringify({ error: 'Proxy error', target: CORE_TARGET, message: err.message }));
		}
	},
});

module.exports = function (app) {
	// Restreamer Core REST API
	app.use('/api', coreProxy);

	// Restreamer Core in-memory FS (HLS playlists, snapshots)
	app.use('/memfs', coreProxy);

	// Restreamer Core disk FS
	app.use('/diskfs', coreProxy);

	// yt-dlp stream extractor: /yt-stream/{VIDEO_ID} → /stream/{VIDEO_ID}
	// yt-dlp puede tardar hasta 30-60s en extraer la URL — timeout extendido
	app.use(
		'/yt-stream',
		createProxyMiddleware({
			target: YTDLP_TARGET,
			changeOrigin: true,
			secure: false,
			ws: false,
			proxyTimeout: 120000,   // 120s — yt-dlp puede tardar bastante
			timeout: 120000,
			pathRewrite: { '^/yt-stream': '/stream' },
			onError: (err, req, res) => {
				console.error(`[setupProxy] yt-dlp proxy error: ${err.code} — ${err.message}`);
				if (!res.headersSent) {
					res.writeHead(502, { 'Content-Type': 'application/json' });
					res.end(JSON.stringify({ error: 'Proxy error', target: YTDLP_TARGET, message: err.message }));
				}
			},
		}),
	);

	// Facebook OAuth server: /fb-server/* → http://localhost:3002/*
	// Routes: /fb/config, /fb/accounts, /fb/exchange, /fb/refresh/:id, /fb/upgrade
	app.use(
		'/fb-server',
		createProxyMiddleware({
			target: FB_SERVER_TARGET,
			changeOrigin: true,
			secure: false,
			pathRewrite: { '^/fb-server': '' },
			onError: (err, req, res) => {
				console.error(`[setupProxy] fb-server proxy error: ${err.code} — ${err.message}`);
				if (!res.headersSent) {
					res.writeHead(502, { 'Content-Type': 'application/json' });
					res.end(JSON.stringify({ error: 'fb-server unavailable', message: err.message }));
				}
			},
		}),
	);

	// OAuth2 callback: sirve el HTML de callback para YouTube y otras plataformas
	app.get('/oauth2callback', (req, res) => {
		const callbackFile = path.join(__dirname, '..', 'public', 'oauth2callback.html');
		if (fs.existsSync(callbackFile)) {
			res.sendFile(callbackFile);
		} else {
			res.status(404).send('oauth2callback.html not found');
		}
	});

	// Facebook OAuth2 callback popup
	app.get('/oauth/facebook/callback.html', (req, res) => {
		const callbackFile = path.join(__dirname, '..', 'public', 'oauth', 'facebook', 'callback.html');
		if (fs.existsSync(callbackFile)) {
			res.sendFile(callbackFile);
		} else {
			res.status(404).send('Facebook callback.html not found');
		}
	});
};