<?php
/**
 * PeerTube orphan video check endpoint (admin).
 *
 * GET /admin/actions/peertube-orphans.php
 *
 * Returns JSON with a list of PeerTube channel videos that are NOT linked to
 * any TFE in the database.
 */
require_once __DIR__ . '/../../../bootstrap.php';
require_once __DIR__ . '/../../../src/AdminAuth.php';

AdminAuth::requireLogin();

if ($_SERVER['REQUEST_METHOD'] !== 'GET') {
    http_response_code(405);
    exit;
}

require_once APP_ROOT . '/src/Database.php';
require_once APP_ROOT . '/src/PeerTubeService.php';

$db = new Database();

if (!PeerTubeService::isConfigured($db)) {
    header('Content-Type: application/json; charset=utf-8');
    echo json_encode([
        'configured' => false,
        'error'      => 'PeerTube non configuré.',
    ]);
    exit;
}

// ── Collect all Peertube UUIDs linked in the DB ──────────────────────────
$pdo       = $db->getPDO();
$dbUuids   = [];
$linkedMap = []; // uuid → [thesis_id, thesis_title, thesis_identifier]

$stmt = $pdo->query(
    "SELECT tf.file_path, tf.file_name, t.id AS thesis_id, t.title, t.identifier
     FROM thesis_files tf
     JOIN theses t ON t.id = tf.thesis_id
     WHERE tf.file_path LIKE 'peertube_ids:%'
       AND t.deleted_at IS NULL"
);
while ($row = $stmt->fetch(\PDO::FETCH_ASSOC)) {
    $uuid = substr($row['file_path'], strlen('peertube_ids:'));
    $dbUuids[$uuid] = true;
    $linkedMap[$uuid][] = [
        'thesis_id'    => (int)$row['thesis_id'],
        'title'        => $row['title'],
        'identifier'   => $row['identifier'] ?? '',
    ];
}

// ── List all channel videos ──────────────────────────────────────────────
try {
    $channelVideos = PeerTubeService::listChannelVideos($db);
} catch (\Throwable $e) {
    header('Content-Type: application/json; charset=utf-8');
    echo json_encode([
        'configured' => true,
        'error'      => 'Erreur lors du listage des vidéos : ' . $e->getMessage(),
    ]);
    exit;
}

// ── Find orphans: on channel but not in DB ───────────────────────────────
$orphans = [];
$linked  = [];
foreach ($channelVideos as $v) {
    $uuid   = $v['shortUUID'] ?: $v['uuid'];
    if ($uuid === '') {
        continue;
    }
    if (isset($dbUuids[$uuid])) {
        $linked[] = [
            'uuid'      => $uuid,
            'name'      => $v['name'],
            'theses'    => $linkedMap[$uuid] ?? [],
        ];
    } else {
        $orphans[] = [
            'uuid'      => $uuid,
            'name'      => $v['name'],
            'createdAt' => $v['createdAt'],
        ];
    }
}

// ── Find stale DB entries: in DB but not on channel ──────────────────────
$stale = [];
foreach ($dbUuids as $uuid => $_) {
    $found = false;
    foreach ($channelVideos as $v) {
        if (($v['shortUUID'] ?: $v['uuid']) === $uuid) {
            $found = true;
            break;
        }
    }
    if (!$found) {
        $stale[] = [
            'uuid'   => $uuid,
            'theses' => $linkedMap[$uuid] ?? [],
        ];
    }
}

$totalOnChannel = count($channelVideos);

header('Content-Type: application/json; charset=utf-8');
echo json_encode([
    'configured'       => true,
    'channel_name'     => PeerTubeService::getSettings($db)['channel_name'],
    'total_on_channel' => $totalOnChannel,
    'total_linked'     => count($linked),
    'orphan_count'     => count($orphans),
    'orphans'          => $orphans,
    'stale_count'      => count($stale),
    'stale_entries'    => $stale,
]);