<?php
header('Content-Type: application/json');
header('Access-Control-Allow-Origin: *');
header('Access-Control-Allow-Methods: POST, OPTIONS');
header('Access-Control-Allow-Headers: Content-Type');

if ($_SERVER['REQUEST_METHOD'] === 'OPTIONS') {
    http_response_code(204);
    exit;
}

if ($_SERVER['REQUEST_METHOD'] !== 'POST') {
    http_response_code(405);
    echo json_encode(['error' => 'Method not allowed']);
    exit;
}

$input    = json_decode(file_get_contents('php://input'), true);
$username = trim($input['username'] ?? '');
$filepath = trim($input['filepath'] ?? '');  // empty = delete entire site
$deleteAll = (bool)($input['delete_all'] ?? false);

// Validate username
if (!preg_match('/^[a-z0-9]{3,32}$/', $username)) {
    http_response_code(400);
    echo json_encode(['error' => 'Invalid username']);
    exit;
}

// Check user exists
$db = new PDO('sqlite:/data/db/platform.sqlite');
$db->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
$stmt = $db->prepare('SELECT id FROM users WHERE username = ?');
$stmt->execute([$username]);
if (!$stmt->fetch()) {
    http_response_code(404);
    echo json_encode(['error' => 'User not found']);
    exit;
}

$htdocs = "/data/sites/{$username}/htdocs";

// ── Delete entire site ────────────────────────────────────────────────────────
if ($deleteAll) {
    $siteDir = "/data/sites/{$username}";

    // Recursively delete the site directory
    $deleted = deleteDirectory($siteDir);

    if ($deleted) {
        // Remove user and all files from database
        $db->prepare('DELETE FROM files WHERE username = ?')->execute([$username]);
        $db->prepare('DELETE FROM users WHERE username = ?')->execute([$username]);
        echo json_encode([
            'success' => true,
            'message' => "Site {$username} deleted completely"
        ]);
    } else {
        http_response_code(500);
        echo json_encode(['error' => 'Failed to delete site directory']);
    }
    exit;
}

// ── Delete a single file ──────────────────────────────────────────────────────
$filepath = basename($filepath);
if (empty($filepath)) {
    http_response_code(400);
    echo json_encode(['error' => 'No filepath provided']);
    exit;
}

$dest = "{$htdocs}/{$filepath}";

if (!file_exists($dest)) {
    http_response_code(404);
    echo json_encode(['error' => 'File not found']);
    exit;
}

if (unlink($dest)) {
    $db->prepare('DELETE FROM files WHERE username = ? AND filepath = ?')
       ->execute([$username, $filepath]);
    echo json_encode([
        'success'  => true,
        'message'  => "File {$filepath} deleted"
    ]);
} else {
    http_response_code(500);
    echo json_encode(['error' => 'Failed to delete file']);
}

// ── Helper: recursively delete a directory ────────────────────────────────────
function deleteDirectory(string $dir): bool {
    if (!is_dir($dir)) return false;
    $items = scandir($dir);
    foreach ($items as $item) {
        if ($item === '.' || $item === '..') continue;
        $path = "{$dir}/{$item}";
        is_dir($path) ? deleteDirectory($path) : unlink($path);
    }
    return rmdir($dir);
}