<?php
/**
 * Restore a trashed file back to its original location (admin).
 *
 * POST /admin/actions/restore-trash.php
 * Body: trash_file=123_filename.pdf
 *
 * Reads the JSON sidecar file (trash_file.json) to get the original
 * thesis_files row metadata, re-inserts the DB row, and moves the file
 * back from tmp/_trash to its original storage path.
 */

require_once __DIR__ . '/../../../bootstrap.php';
require_once __DIR__ . '/../../../src/AdminAuth.php';

AdminAuth::requireLogin();

if ($_SERVER['REQUEST_METHOD'] !== 'POST') {
    http_response_code(405);
    header('Content-Type: application/json; charset=utf-8');
    echo json_encode(['ok' => false, 'error' => 'Méthode non autorisée.']);
    exit;
}

if (!isset($_POST['csrf_token'], $_SESSION['csrf_token'])
    || !hash_equals($_SESSION['csrf_token'], $_POST['csrf_token'])) {
    http_response_code(403);
    header('Content-Type: application/json; charset=utf-8');
    echo json_encode(['ok' => false, 'error' => 'CSRF invalide.']);
    exit;
}

$trashFile  = trim($_POST['trash_file'] ?? '');
$trashFiles = $_POST['trash_files'] ?? [];
if (!is_array($trashFiles)) $trashFiles = [];

// Normalise: accept both single (trash_file) and bulk (trash_files[])
$allTrashFiles = $trashFile !== '' ? [$trashFile] : $trashFiles;
$allTrashFiles = array_values(array_filter(array_map('trim', $allTrashFiles), fn($n) => $n !== ''));

if (empty($allTrashFiles)) {
    http_response_code(400);
    header('Content-Type: application/json; charset=utf-8');
    echo json_encode(['ok' => false, 'error' => 'Aucun fichier spécifié.']);
    exit;
}

require_once __DIR__ . '/../../../src/Database.php';
$db = new Database();

$storageRoot = STORAGE_ROOT;
$trashDir    = $storageRoot . '/tmp/_trash';

$restored = 0;
$skipped  = 0;
$errors   = [];

foreach ($allTrashFiles as $trashFile) {
    $trashFile   = basename($trashFile);
    $trashPath   = $trashDir . '/' . $trashFile;
    $sidecarPath = $trashPath . '.json';

    if (!is_file($trashPath) || !str_starts_with(realpath($trashPath), realpath($trashDir))) {
        $skipped++;
        $errors[] = "$trashFile : introuvable dans la corbeille.";
        continue;
    }

    if (!file_exists($sidecarPath)) {
        $skipped++;
        $errors[] = "$trashFile : métadonnées absentes (trop ancien ?).";
        continue;
    }

    $sidecar = json_decode(file_get_contents($sidecarPath), true);
    if (!is_array($sidecar) || empty($sidecar['file_path']) || empty($sidecar['thesis_id'])) {
        $skipped++;
        $errors[] = "$trashFile : métadonnées corrompues.";
        continue;
    }

    $originalPath = $sidecar['file_path'];
    $thesisId     = (int)$sidecar['thesis_id'];
    $fileType     = $sidecar['file_type'] ?? 'other';
    $fileName     = $sidecar['file_name'] ?? basename($originalPath);
    $mimeType     = $sidecar['mime_type'] ?? 'application/octet-stream';
    $fileSize     = (int)($sidecar['file_size'] ?? 0);
    $displayLabel = $sidecar['display_label'] ?? null;

    $thesis = $db->getThesis($thesisId);
    if (!$thesis) {
        $skipped++;
        $errors[] = "$trashFile : le TFE #$thesisId n'existe plus.";
        continue;
    }

    $absOriginal = $storageRoot . '/' . $originalPath;
    if (file_exists($absOriginal)) {
        @unlink($trashPath);
        @unlink($sidecarPath);
        $skipped++;
        $errors[] = "$trashFile : un fichier existe déjà à l'emplacement d'origine.";
        continue;
    }

    $parentDir = dirname($absOriginal);
    if (!is_dir($parentDir)) {
        mkdir($parentDir, 0755, true);
    }

    if (!rename($trashPath, $absOriginal)) {
        $skipped++;
        $errors[] = "$trashFile : échec du déplacement.";
        continue;
    }
    chmod($absOriginal, 0644);

    @unlink($sidecarPath);

    $db->insertThesisFile(
        $thesisId, $fileType, $originalPath, $fileName,
        $fileSize, $mimeType, $displayLabel, null
    );

    $newId = $db->getConnection()->lastInsertId();
    error_log("[restore-trash] thesis_id=$thesisId file_id=$newId restored: $trashFile → $originalPath");
    $restored++;
}

$_SESSION['csrf_token'] = bin2hex(random_bytes(32));

if (isset($_SERVER['HTTP_HX_REQUEST'])) {
    header('HX-Trigger: refreshStats');
    require __DIR__ . '/cleanup-stats-fragment.php';
    exit;
}

header('Content-Type: application/json; charset=utf-8');
echo json_encode([
    'ok'       => $restored > 0,
    'restored' => $restored,
    'skipped'  => $skipped,
    'errors'   => $errors,
    'message'  => $restored . ' fichier(s) restauré(s).' . ($skipped > 0 ? ' ' . $skipped . ' ignoré(s).' : ''),
]);
exit;