<?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));
}

if ($_SERVER['REQUEST_METHOD'] === 'POST' && isset($_POST['fileId']) && isset($_POST['folderId'])) {
    $fileId = $_POST['fileId'];
    $folderId = $_POST['folderId'];
    $metadata = loadMetadata();

    // Find the file and target folder
    $fileToMove = null;
    $targetFolder = null;
    $fileKey = null;

    foreach ($metadata['files'] as $key => &$file) {
        if ($file['id'] === $fileId) {
            $fileToMove = &$file;
            $fileKey = $key;
        }
        if ($file['id'] === $folderId) {
            $targetFolder = $file;
        }
    }

    if ($fileToMove && $targetFolder && $targetFolder['type'] === 'folder') {
        // Move the actual file or folder
        $oldPath = $fileToMove['path'];
        $fileName = basename($oldPath);
        $newPath = $targetFolder['path'] . '/' . $fileName;

        // Check if destination already exists
        if (file_exists($newPath)) {
            echo json_encode([
                'success' => false,
                'error' => 'A file or folder with this name already exists in the destination'
            ]);
            exit;
        }

        if (rename($oldPath, $newPath)) {
            // Update metadata
            $fileToMove['path'] = $newPath;
            $fileToMove['parentFolder'] = $folderId;
            $fileToMove['modified'] = time();

            saveMetadata($metadata);

            echo json_encode([
                'success' => true,
                'message' => 'File moved successfully'
            ]);
        } else {
            echo json_encode([
                'success' => false,
                'error' => 'Failed to move file on disk'
            ]);
        }
    } else {
        echo json_encode([
            'success' => false,
            'error' => 'File or folder not found'
        ]);
    }
    exit;
}

echo json_encode([
    'success' => false,
    'error' => 'Invalid request'
]);
?>