<?php
require_once __DIR__ . '/config.php';
ensure_dirs();

if ($_SERVER['REQUEST_METHOD'] !== 'POST') {
    fail_json('POST required', 405);
}

// ─── YouTube URL mode (async) ───
$youtubeUrl = $_POST['youtube_url'] ?? '';
if ($youtubeUrl) {
    if (!filter_var($youtubeUrl, FILTER_VALIDATE_URL)) {
        fail_json('Invalid URL');
    }
    if (!preg_match('/(youtube\.com|youtu\.be)/', $youtubeUrl)) {
        fail_json('Only YouTube URLs supported');
    }

    $id = safe_id();
    $uploadPath = UPLOAD_DIR . "/$id.mp4";

    $job = [
        'id' => $id,
        'original_name' => 'youtube_video',
        'upload_path' => $uploadPath,
        'extension' => 'mp4',
        'status' => 'downloading',
        'created_at' => time(),
        'source_video_exposed' => false,
        'youtube_url' => $youtubeUrl
    ];
    write_json_file(RECEIPT_DIR . "/$id.job.json", $job);

    // Fork background download
    $logFile = RECEIPT_DIR . "/$id.download.log";
    $cmd = sprintf(
        'nohup bash -c %s > %s 2>&1 &',
        shell_arg(sprintf(
            'cd /app && yt-dlp -f "best[ext=mp4]/best" -o %s %s 2>&1 && ' .
            'TITLE=$(yt-dlp --get-title %s 2>/dev/null) && ' .
            'echo "DONE|$TITLE" >> %s',
            shell_arg($uploadPath),
            shell_arg($youtubeUrl),
            shell_arg($youtubeUrl),
            shell_arg($logFile)
        )),
        shell_arg($logFile)
    );
    exec($cmd);

    json_response([
        'ok' => true,
        'id' => $id,
        'job' => $job,
        'status_url' => "/api/status.php?id=$id"
    ]);
}

// ─── File upload mode ───
if (!isset($_FILES['video'])) {
    fail_json('No video uploaded or YouTube URL provided');
}

$file = $_FILES['video'];
if ($file['error'] !== UPLOAD_ERR_OK) {
    fail_json('Upload failed', 400, ['upload_error' => $file['error']]);
}

$original = basename($file['name']);
$ext = strtolower(pathinfo($original, PATHINFO_EXTENSION));
$allowed = ['mp4', 'mov', 'm4v', 'webm', 'mkv'];
if (!in_array($ext, $allowed, true)) {
    fail_json('Unsupported video type', 400, ['extension' => $ext]);
}

$id = safe_id();
$uploadPath = UPLOAD_DIR . "/$id.$ext";

if (!move_uploaded_file($file['tmp_name'], $uploadPath)) {
    fail_json('Could not save upload');
}

$job = [
    'id' => $id,
    'original_name' => $original,
    'upload_path' => $uploadPath,
    'extension' => $ext,
    'status' => 'uploaded',
    'created_at' => time(),
    'source_video_exposed' => false
];
write_json_file(RECEIPT_DIR . "/$id.job.json", $job);

json_response([
    'ok' => true,
    'id' => $id,
    'job' => $job
]);