<?php
/**
 * GridTV — proxy.php
 * Relaie les streams HTTP Tunarr depuis un contexte HTTPS.
 * Réécrit les URLs relatives dans les playlists .m3u8.
 */

$url = $_GET['url'] ?? '';

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

$base = preg_replace('#[^/]*(\?.*)?$#', '', $url);

// Transmettre les headers du navigateur à Tunarr
$forward_headers = [];
foreach (['HTTP_ACCEPT', 'HTTP_ACCEPT_LANGUAGE', 'HTTP_ACCEPT_ENCODING', 'HTTP_COOKIE'] as $key) {
    if (!empty($_SERVER[$key])) {
        $name = str_replace('_', '-', substr($key, 5));
        $name = ucwords(strtolower($name), '-');
        $forward_headers[] = "$name: {$_SERVER[$key]}";
    }
}
$forward_headers[] = 'User-Agent: ' . ($_SERVER['HTTP_USER_AGENT'] ?? 'Mozilla/5.0');
$forward_headers[] = 'Origin: http://' . parse_url($url, PHP_URL_HOST);
$forward_headers[] = 'Referer: ' . $url;

$opts = ['http' => [
    'method'          => 'GET',
    'timeout'         => 15,
    'header'          => implode("\r\n", $forward_headers),
    'follow_location' => 1,
    'ignore_errors'   => true,
]];

$ctx  = stream_context_create($opts);
$body = @file_get_contents($url, false, $ctx);

// Lire le vrai status HTTP
$status_line = $http_response_header[0] ?? 'HTTP/1.1 502 Bad Gateway';
preg_match('#HTTP/\S+\s+(\d+)#', $status_line, $sm);
$status_code = (int)($sm[1] ?? 502);

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

// Content-Type de la réponse distante
$ct = 'application/octet-stream';
foreach ($http_response_header as $h) {
    if (preg_match('/^Content-Type:\s*(.+)/i', $h, $m)) {
        $ct = trim($m[1]); break;
    }
}

$is_m3u8 = stripos($url, '.m3u8') !== false
        || strpos($body, '#EXTM3U') === 0
        || strpos($body, '#EXT-X-') !== false;

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

if ($is_m3u8) {
    header('Content-Type: application/vnd.apple.mpegurl');

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

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