<?php
session_start();
$metadataFile = 'data/files.json';

function loadMetadata() {
    global $metadataFile;
    if (!file_exists($metadataFile)) return ['files' => []];
    return json_decode(file_get_contents($metadataFile), true);
}

function saveMetadata($metadata) {
    global $metadataFile;
    file_put_contents($metadataFile, json_encode($metadata, JSON_PRETTY_PRINT));
}

function deleteDirectory($dir) {
    if (!is_dir($dir)) return;
    $files = array_diff(scandir($dir), ['.', '..']);
    foreach ($files as $file) {
        $path = $dir . '/' . $file;
        is_dir($path) ? deleteDirectory($path) : unlink($path);
    }
    rmdir($dir);
}

if ($_SERVER['REQUEST_METHOD'] === 'POST' && isset($_POST['fileIds'])) {
    $fileIds = json_decode($_POST['fileIds'], true);
    if (!is_array($fileIds)) {
        $fileIds = [$_POST['fileId']];
    }
    
    $metadata = loadMetadata();
    $deletedCount = 0;
    
    foreach ($fileIds as $fileId) {
        foreach ($metadata['files'] as $key => $file) {
            if ($file['id'] === $fileId) {
                // Delete actual file or folder
                if ($file['type'] === 'folder') {
                    if (is_dir($file['path'])) {
                        deleteDirectory($file['path']);
                    }
                } else {
                    if (file_exists($file['path'])) {
                        unlink($file['path']);
                    }
                }
                
                // Remove from metadata
                unset($metadata['files'][$key]);
                $deletedCount++;
                break;
            }
        }
    }
    
    $metadata['files'] = array_values($metadata['files']);
    saveMetadata($metadata);
    
    echo json_encode(['success' => true, 'deletedCount' => $deletedCount]);
    exit;
}

// Single file delete (backward compatibility)
if ($_SERVER['REQUEST_METHOD'] === 'POST' && isset($_POST['fileId'])) {
    $fileId = $_POST['fileId'];
    $metadata = loadMetadata();
    
    foreach ($metadata['files'] as $key => $file) {
        if ($file['id'] === $fileId) {
            if ($file['type'] === 'folder') {
                if (is_dir($file['path'])) {
                    deleteDirectory($file['path']);
                }
            } else {
                if (file_exists($file['path'])) {
                    unlink($file['path']);
                }
            }
            
            unset($metadata['files'][$key]);
            $metadata['files'] = array_values($metadata['files']);
            saveMetadata($metadata);
            
            echo json_encode(['success' => true]);
            exit;
        }
    }
    
    echo json_encode(['success' => false]);
}
?>