import 'dart:convert';

import 'package:flutter_secure_storage/flutter_secure_storage.dart';
import 'package:flutter_test/flutter_test.dart';
import 'package:buzz/shared/community/community.dart';
import 'package:buzz/shared/community/community_storage.dart';
import 'package:buzz/shared/push/push_subscription.dart';

/// In-memory fake that extends Fake to satisfy all FlutterSecureStorage
/// interface methods, but implements the core read/write/delete with real
/// in-memory logic.
class FakeSecureStorage extends Fake implements FlutterSecureStorage {
  final Map<String, String> _data = {};

  @override
  Future<String?> read({
    required String key,
    AppleOptions? iOptions,
    AndroidOptions? aOptions,
    LinuxOptions? lOptions,
    WebOptions? webOptions,
    AppleOptions? mOptions,
    WindowsOptions? wOptions,
  }) async => _data[key];

  @override
  Future<void> write({
    required String key,
    required String? value,
    AppleOptions? iOptions,
    AndroidOptions? aOptions,
    LinuxOptions? lOptions,
    WebOptions? webOptions,
    AppleOptions? mOptions,
    WindowsOptions? wOptions,
  }) async {
    if (value != null) {
      _data[key] = value;
    } else {
      _data.remove(key);
    }
  }

  @override
  Future<void> delete({
    required String key,
    AppleOptions? iOptions,
    AndroidOptions? aOptions,
    LinuxOptions? lOptions,
    WebOptions? webOptions,
    AppleOptions? mOptions,
    WindowsOptions? wOptions,
  }) async => _data.remove(key);

  @override
  Future<Map<String, String>> readAll({
    AppleOptions? iOptions,
    AndroidOptions? aOptions,
    LinuxOptions? lOptions,
    WebOptions? webOptions,
    AppleOptions? mOptions,
    WindowsOptions? wOptions,
  }) async => Map.from(_data);

  @override
  Future<void> deleteAll({
    AppleOptions? iOptions,
    AndroidOptions? aOptions,
    LinuxOptions? lOptions,
    WebOptions? webOptions,
    AppleOptions? mOptions,
    WindowsOptions? wOptions,
  }) async => _data.clear();

  @override
  Future<bool> containsKey({
    required String key,
    AppleOptions? iOptions,
    AndroidOptions? aOptions,
    LinuxOptions? lOptions,
    WebOptions? webOptions,
    AppleOptions? mOptions,
    WindowsOptions? wOptions,
  }) async => _data.containsKey(key);

  // Convenience for setting up test data.
  String? operator [](String key) => _data[key];
  void operator []=(String key, String value) => _data[key] = value;
}

void main() {
  late FakeSecureStorage fakeSecure;
  late CommunityStorage storage;

  setUp(() {
    fakeSecure = FakeSecureStorage();
    storage = CommunityStorage(secure: fakeSecure);
  });

  group('CommunityStorage', () {
    test('loadAll returns empty list when no data', () async {
      final result = await storage.loadAll();
      expect(result, isEmpty);
    });

    test('save and loadAll round-trips a community', () async {
      final ws = Community.create(
        name: 'Test',
        relayUrl: 'https://relay.example.com',
        pubkey: 'abc123',
      );

      await storage.save(ws);
      final loaded = await storage.loadAll();

      expect(loaded, hasLength(1));
      expect(loaded.first.id, ws.id);
      expect(loaded.first.name, 'Test');
      expect(loaded.first.relayUrl, 'https://relay.example.com');
      expect(loaded.first.pubkey, 'abc123');
      expect(
        loaded.first.pushSubscriptionState.authority,
        BuzzPushLeaseSubscriptionAuthority.desired,
      );
    });

    test('round-trips desired push subscription state', () async {
      final pubkey = 'a' * 64;
      final subscriptions = buildDesiredBuzzPushSubscriptions(
        myPubkey: pubkey,
        channelIds: const ['123e4567-e89b-42d3-a456-426614174000'],
      );
      final community =
          Community.create(
            name: 'Push',
            relayUrl: 'https://relay.example.com',
            pubkey: pubkey,
          ).copyWith(
            pushSubscriptionState: BuzzPushLeaseSubscriptionState.desired(
              desired: subscriptions,
            ),
          );

      await storage.save(community);
      final loaded = (await storage.loadAll()).single;

      expect(
        loaded.pushSubscriptionState.toJson(),
        community.pushSubscriptionState.toJson(),
      );
    });

    test('round-trips a pending push tombstone journal', () async {
      final subscription = BuzzPushSubscription(
        filter: BuzzPushFilter(kinds: const [9], pTags: ['a' * 64]),
        notificationClass: 'default',
      );
      final state =
          BuzzPushLeaseSubscriptionState.desired(desired: [subscription])
              .withAccepted(subscriptions: [subscription], generation: 4)
              .withPendingTombstone(5);
      final community = Community.create(
        name: 'Push',
        relayUrl: 'https://relay.example.com',
      ).copyWith(pushSubscriptionState: state);

      await storage.save(community);
      final loaded = (await storage.loadAll()).single;

      expect(loaded.pushSubscriptionState.toJson(), state.toJson());
      expect(loaded.pushSubscriptionState.pendingTombstoneGeneration, 5);
    });

    test(
      'migrates a disabled reserved generation into a tombstone journal',
      () {
        final community =
            Community.create(
              name: 'Push',
              relayUrl: 'https://relay.example.com',
            ).copyWith(
              pushNotificationsEnabled: false,
              pushSubscriptionState:
                  const BuzzPushLeaseSubscriptionState.desired(
                    acceptedGeneration: 4,
                    generationCursor: 5,
                  ),
            );
        final json = community.toJson();
        (json['pushSubscriptionState'] as Map<String, dynamic>).remove(
          'pendingTombstoneGeneration',
        );

        final migrated = Community.fromJson(json);

        expect(migrated.pushSubscriptionState.pendingTombstoneGeneration, 5);
      },
    );

    test('save updates existing community with same id', () async {
      final ws = Community.create(
        name: 'Original',
        relayUrl: 'https://relay.example.com',
      );

      await storage.save(ws);
      await storage.save(ws.copyWith(name: 'Updated'));

      final loaded = await storage.loadAll();
      expect(loaded, hasLength(1));
      expect(loaded.first.name, 'Updated');
    });

    test('remove deletes a community', () async {
      final ws1 = Community.create(
        name: 'One',
        relayUrl: 'https://one.example.com',
      );
      final ws2 = Community.create(
        name: 'Two',
        relayUrl: 'https://two.example.com',
      );

      await storage.save(ws1);
      await storage.save(ws2);
      await storage.remove(ws1.id);

      final loaded = await storage.loadAll();
      expect(loaded, hasLength(1));
      expect(loaded.first.id, ws2.id);
    });

    test('active community ID persists', () async {
      await storage.saveActiveId('ws-123');
      final id = await storage.loadActiveId();
      expect(id, 'ws-123');
    });

    test('clearActiveId removes active ID', () async {
      await storage.saveActiveId('ws-123');
      await storage.clearActiveId();
      final id = await storage.loadActiveId();
      expect(id, isNull);
    });

    group('migration', () {
      test('migrates saved workspaces to communities', () async {
        final legacy = Community.create(
          name: 'Legacy',
          relayUrl: 'https://legacy.example.com',
        );
        fakeSecure['buzz_workspaces'] = jsonEncode([legacy.toJson()]);
        fakeSecure['buzz_active_workspace_id'] = legacy.id;

        final loaded = await storage.loadAll();

        expect(loaded.single.id, legacy.id);
        expect(await storage.loadActiveId(), legacy.id);
        expect(fakeSecure['buzz_communities'], isNotNull);
        expect(fakeSecure['buzz_workspaces'], isNull);
        expect(fakeSecure['buzz_active_workspace_id'], isNull);
      });

      test('migrates legacy keys to community on first load', () async {
        fakeSecure['buzz_relay_url'] = 'https://legacy.example.com';
        fakeSecure['buzz_token'] = 'legacy_token';
        fakeSecure['buzz_pubkey'] = 'legacy_pub';
        fakeSecure['buzz_nsec'] = 'legacy_nsec';

        final loaded = await storage.loadAll();

        expect(loaded, hasLength(1));
        expect(loaded.first.relayUrl, 'https://legacy.example.com');
        expect(loaded.first.pubkey, 'legacy_pub');
        expect(loaded.first.nsec, 'legacy_nsec');
        expect(loaded.first.name, isNotEmpty);
        expect(
          loaded.first.sensitiveActionPolicy,
          SensitiveActionPolicy.disabledByUser,
        );

        // Legacy keys should be deleted.
        expect(fakeSecure['buzz_relay_url'], isNull);
        expect(fakeSecure['buzz_token'], isNull);
        expect(fakeSecure['buzz_pubkey'], isNull);
        expect(fakeSecure['buzz_nsec'], isNull);

        // Active ID should be set.
        final activeId = await storage.loadActiveId();
        expect(activeId, loaded.first.id);
      });

      test('does not migrate when no legacy keys exist', () async {
        final loaded = await storage.loadAll();
        expect(loaded, isEmpty);
      });

      test('does not re-migrate after first load', () async {
        fakeSecure['buzz_relay_url'] = 'https://legacy.example.com';
        fakeSecure['buzz_token'] = 'legacy_token';

        final first = await storage.loadAll();
        expect(first, hasLength(1));

        final second = await storage.loadAll();
        expect(second, hasLength(1));
        expect(second.first.id, first.first.id);
      });

      test('migration generates name from localhost URL', () async {
        fakeSecure['buzz_relay_url'] = 'http://localhost:3000';
        fakeSecure['buzz_token'] = 'tok';

        final loaded = await storage.loadAll();
        expect(loaded.first.name, 'Local Dev');
      });
    });
  });
}