<?php
$rootPath = dirname(dirname(__DIR__));
require_once($rootPath . '/src/config/env.php');
require_once($rootPath . '/src/config/session.php');
require_once($rootPath . '/src/config/connection.php');

if (!isset($_SESSION['user_id'])) {
    http_response_code(403);
    exit('Forbidden');
}

$album_id = intval($_GET['id'] ?? 0);

if (!$album_id) {
    http_response_code(400);
    exit('Album ID is required');
}

// Verify ownership
$albumCheck = $conn->prepare("SELECT user_id FROM photo_albums WHERE album_id = ?");
$albumCheck->bind_param("i", $album_id);
$albumCheck->execute();
$albumResult = $albumCheck->get_result();

if ($albumResult->num_rows === 0) {
    $conn->close();
    http_response_code(404);
    header('Location: gallery');
    exit;
}

$album = $albumResult->fetch_assoc();
if ($album['user_id'] !== $_SESSION['user_id']) {
    $conn->close();
    http_response_code(403);
    header('Location: gallery');
    exit;
}
$albumCheck->close();

try {
    // Start transaction
    $conn->begin_transaction();

    // Get all photos for this album
    $photoStmt = $conn->prepare("SELECT file_path FROM photos WHERE album_id = ?");
    $photoStmt->bind_param("i", $album_id);
    $photoStmt->execute();
    $photoResult = $photoStmt->get_result();

    // Delete photo files
    while ($photo = $photoResult->fetch_assoc()) {
        $photoPath = $_SERVER['DOCUMENT_ROOT'] . $photo['file_path'];
        if (file_exists($photoPath)) {
            unlink($photoPath);
        }
    }
    $photoStmt->close();

    // Delete photos from database (cascade should handle this)
    $deletePhotosStmt = $conn->prepare("DELETE FROM photos WHERE album_id = ?");
    $deletePhotosStmt->bind_param("i", $album_id);
    $deletePhotosStmt->execute();
    $deletePhotosStmt->close();

    // Delete album from database
    $deleteAlbumStmt = $conn->prepare("DELETE FROM photo_albums WHERE album_id = ?");
    $deleteAlbumStmt->bind_param("i", $album_id);
    $deleteAlbumStmt->execute();
    $deleteAlbumStmt->close();

    // Delete album directory
    $albumDir = $rootPath . '/assets/uploads/gallery/' . $album_id;
    if (is_dir($albumDir)) {
        rmdir($albumDir);
    }

    // Commit transaction
    $conn->commit();
    $conn->close();

    // Redirect to gallery
    header('Location: gallery');
    exit;

} catch (Exception $e) {
    // Rollback on error
    $conn->rollback();
    $conn->close();

    http_response_code(400);
    echo 'Error deleting album: ' . htmlspecialchars($e->getMessage());
    exit;
}
?>