<?php
/**
 * Unified export dispatcher.
 *
 * Query params:
 *   csv=1   — export CSV
 *   files=1 — export ZIP of files
 *
 * If both are requested, CSV is streamed first (as a download) then the ZIP.
 * In practice, browsers handle this as two sequential downloads.
 */
require_once __DIR__ . "/../../../bootstrap.php";
require_once __DIR__ . '/../../../src/AdminAuth.php';
AdminAuth::requireLogin();

require_once APP_ROOT . '/src/Controllers/ExportController.php';
require_once APP_ROOT . '/src/AdminLogger.php';
require_once APP_ROOT . '/src/ErrorHandler.php';

$doCsv   = !empty($_GET['csv']);
$doFiles = !empty($_GET['files']);
$doDb    = !empty($_GET['db']);

if (!$doCsv && !$doFiles && !$doDb) {
    $doCsv = true;
}

$controller = ExportController::create();

if ($doCsv) {
    AdminLogger::make()->logCsvExport();

    $filename = 'xamxam-export-' . date('Y-m-d') . '.csv';

    header('Content-Type: text/csv; charset=UTF-8');
    header('Content-Disposition: attachment; filename="' . $filename . '"');
    header('Cache-Control: no-cache, must-revalidate');

    echo "\xEF\xBB\xBF";

    $out = fopen('php://output', 'w');
    fputcsv($out, ExportController::CSV_HEADERS, ',', '"', '');
    $rows = $controller->exportAllTheses();
    foreach ($rows as $csvLine) {
        fputcsv($out, $csvLine, ',', '"', '');
    }
    fclose($out);

    // If only CSV, we're done
    if (!$doFiles) {
        exit;
    }
}

if ($doFiles) {
    try {
        $zipPath = $controller->createExportZip();
        $fileSize = filesize($zipPath);
        $fileCount = count($controller->getAllThesisFiles());

        AdminLogger::make()->logFilesExport($fileCount, (int)$fileSize);

        $filename = 'xamxam-files-' . date('Y-m-d') . '.zip';

        header('Content-Type: application/zip');
        header('Content-Disposition: attachment; filename="' . $filename . '"');
        header('Content-Length: ' . $fileSize);
        header('Cache-Control: no-cache, must-revalidate');

        readfile($zipPath);
        @unlink($zipPath);
    } catch (Exception $e) {
        ErrorHandler::log('export', $e);
        http_response_code(500);
        exit('Erreur lors de la création de l\'archive : ' . htmlspecialchars(ErrorHandler::userMessage($e)));
    }
}

if ($doDb) {
    $dbPath = $controller->getDatabasePath();

    if (!file_exists($dbPath)) {
        http_response_code(500);
        exit('Base de données introuvable.');
    }

    $filename = 'xamxam-db-' . date('Y-m-d') . '.sqlite';

    header('Content-Type: application/octet-stream');
    header('Content-Disposition: attachment; filename="' . $filename . '"');
    header('Content-Length: ' . filesize($dbPath));
    header('Cache-Control: no-cache, must-revalidate');

    AdminLogger::make()->logDbExport();

    readfile($dbPath);
}

exit;
