// SPDX-FileCopyrightText: 2019-Present Christian Kußowski
// SPDX-FileCopyrightText: 2019-Present Contributors to FluffyChat
//
// SPDX-License-Identifier: AGPL-3.0-or-later

import 'package:matrix/matrix.dart';

/// Account data key that holds the list of installed mini app IDs.
const String installedMiniAppsKey = 'im.tatuchat.miniapps.installed';

/// Prefix of the account data keys that hold a mini app's JSON document.
const String miniAppDataKeyPrefix = 'im.tatuchat.miniapps.data.';

/// Prefix of the account data keys that hold the HTML source of an imported
/// mini app. The key is ``{prefix}{appId}`` and the content is
/// `{name: '...', html: '...'}`.
const String miniAppSourceKeyPrefix = 'im.tatuchat.miniapps.source.';

/// Extension that gives every [Client] access to the mini apps store which is
/// persisted in the user's account data ("localStorage on the server").
extension MiniAppStoreExtension on Client {
  List<String> get installedMiniApps {
    final apps = accountData[installedMiniAppsKey]?.content['apps'];
    if (apps is List) return [...apps.whereType<String>()];
    return [];
  }

  bool isMiniAppInstalled(String appId) => installedMiniApps.contains(appId);

  Future<void> installMiniApp(String appId) async {
    final apps = installedMiniApps;
    if (apps.contains(appId)) return;
    apps.add(appId);
    await setAccountData(userID!, installedMiniAppsKey, {'apps': apps});
  }

  Future<void> uninstallMiniApp(String appId) async {
    final apps = installedMiniApps..remove(appId);
    await setAccountData(userID!, installedMiniAppsKey, {'apps': apps});
    // Clear the custom HTML source if present.
    await setAccountData(userID!, '$miniAppSourceKeyPrefix$appId', {
      'html': '',
      'name': '',
    });
  }

  /// Reads the JSON document of the given mini app. Returns an empty map if
  /// the app never stored anything.
  Map<String, dynamic> getMiniAppData(String appId) =>
      accountData['$miniAppDataKeyPrefix$appId']?.content ?? const {};

  /// Overwrites the JSON document of the given mini app.
  Future<void> setMiniAppData(String appId, Map<String, Object?> data) =>
      setAccountData(userID!, '$miniAppDataKeyPrefix$appId', data);

  // ---------- Imported (custom) apps ----------

  /// Stores the HTML source and a display name for a user-imported mini app
  /// and adds it to the installed list if not already present.
  Future<void> importMiniApp({
    required String appId,
    required String name,
    required String html,
  }) async {
    await setAccountData(userID!, '$miniAppSourceKeyPrefix$appId', {
      'name': name,
      'html': html,
    });
    final apps = installedMiniApps;
    if (!apps.contains(appId)) {
      apps.add(appId);
      await setAccountData(userID!, installedMiniAppsKey, {'apps': apps});
    }
  }

  /// Returns the raw HTML source of an imported mini app, or null if the app
  /// is a built-in app or was never imported.
  String? getMiniAppSource(String appId) {
    final content =
        accountData['$miniAppSourceKeyPrefix$appId']?.content;
    if (content == null) return null;
    final html = content['html'];
    return (html is String && html.isNotEmpty) ? html : null;
  }

  /// Returns the display name of an imported mini app, or null.
  String? getMiniAppName(String appId) {
    final content =
        accountData['$miniAppSourceKeyPrefix$appId']?.content;
    if (content == null) return null;
    final name = content['name'];
    return (name is String && name.isNotEmpty) ? name : null;
  }
}