<?php
/**
 * GridTV — proxy.php (Apache + cURL)
 */

$url = $_GET['url'] ?? '';
if (empty($url) || !preg_match('#^https?://#i', $url)) {
    http_response_code(400); die('Invalid URL');
}

$base = preg_replace('#[^/]*(\?.*)?$#', '', $url);
$path = parse_url($url, PHP_URL_PATH) ?? '';
$is_segment = preg_match('#\.(ts|aac|mp4|m4s|fmp4)(\?|$)#i', $path);

header('Access-Control-Allow-Origin: *');
header('Cache-Control: no-cache');

$ua = $_SERVER['HTTP_USER_AGENT'] ?? 'Mozilla/5.0';

if ($is_segment) {
    // Segment binaire — stream via cURL chunk par chunk
    header('Content-Type: video/MP2T');
    header('X-Content-Type-Options: nosniff');

    if (ob_get_level()) ob_end_clean();

    $ch = curl_init($url);
    curl_setopt_array($ch, [
        CURLOPT_FOLLOWLOCATION => true,
        CURLOPT_TIMEOUT        => 30,
        CURLOPT_USERAGENT      => $ua,
        CURLOPT_HTTPHEADER     => ['Accept: */*'],
        CURLOPT_RETURNTRANSFER => false,
        CURLOPT_WRITEFUNCTION  => function($ch, $data) {
            echo $data;
            flush();
            return strlen($data);
        },
        CURLOPT_HEADERFUNCTION => function($ch, $header) {
            $h = trim($header);
            if (preg_match('/^Content-Type:/i', $h)) {
                header($h);
            }
            return strlen($header);
        },
    ]);

    $ok = curl_exec($ch);
    $code = curl_getinfo($ch, CURLINFO_HTTP_CODE);
    if (!$ok || $code >= 400) {
        http_response_code($code ?: 502);
    }
    curl_close($ch);

} else {
    // Playlist .m3u8 — fetch + réécriture URLs
    $ch = curl_init($url);
    curl_setopt_array($ch, [
        CURLOPT_FOLLOWLOCATION => true,
        CURLOPT_TIMEOUT        => 15,
        CURLOPT_USERAGENT      => $ua,
        CURLOPT_HTTPHEADER     => ['Accept: */*'],
        CURLOPT_RETURNTRANSFER => true,
    ]);
    $body = curl_exec($ch);
    $code = curl_getinfo($ch, CURLINFO_HTTP_CODE);
    curl_close($ch);

    if ($body === false || $code >= 400) {
        http_response_code($code ?: 502);
        die("Upstream error $code");
    }

    header('Content-Type: application/vnd.apple.mpegurl');

    $proxy_base = (isset($_SERVER['HTTPS']) ? 'https' : 'http')
                . '://' . $_SERVER['HTTP_HOST']
                . strtok($_SERVER['REQUEST_URI'], '?')
                . '?url=';

    $out = [];
    foreach (explode("\n", $body) as $line) {
        $line = rtrim($line);
        if ($line === '' || $line[0] === '#') {
            $line = preg_replace_callback('/URI="([^"]+)"/', function($m) use ($base, $proxy_base) {
                $seg = strpos($m[1], 'http') === 0 ? $m[1] : $base . $m[1];
                return 'URI="' . $proxy_base . urlencode($seg) . '"';
            }, $line);
            $out[] = $line;
        } else {
            $seg = strpos($line, 'http') === 0 ? $line : $base . $line;
            $out[] = $proxy_base . urlencode($seg);
        }
    }
    echo implode("\n", $out);
}