import 'package:clock/clock.dart';
import 'package:flutter_test/flutter_test.dart';
import 'package:halkyon_app/halkyon_app.dart';
import 'package:halkyon_app/testing.dart';
import 'package:halkyon_llm/halkyon_llm.dart';

// The person's assistants in an app's settings, the operator's grants and
// the use by month (Halkyon Learn's ADR 0021, step 2).

const _claude = OfferedAssistant(
  id: 'claude',
  name: 'Claude',
  protocol: 'anthropic',
  host: 'api.anthropic.com',
  model: 'claude-sonnet-5-5',
);

const _own = OwnAssistant(
  id: 'own-1',
  name: 'My GPT',
  protocol: LlmProtocol.openai,
  model: 'gpt-5',
  apiKey: 'sk-own',
);

const _setUp = AssistantsSetUp(
  assistants: [
    SetUpAssistant(
      id: 'claude',
      name: 'Claude',
      protocol: 'anthropic',
      host: 'api.anthropic.com',
      model: 'claude-sonnet-5-5',
      priceInput: 3,
      priceOutput: 15,
    ),
  ],
);

void main() {
  group('AssistantsCubit', () {
    late FakeAssistantGateway gateway;
    late AssistantRepository repository;
    late MemoryOwnAssistantStore store;
    late AssistantsCubit cubit;

    setUp(() {
      gateway = FakeAssistantGateway()
        ..offer = const AssistantsOffer(assistants: [_claude], ownKeys: true);
      repository = AssistantRepository(gateway, llm: FakeLlmClient());
      store = MemoryOwnAssistantStore();
      cubit = AssistantsCubit(repository, ownAssistants: store);
      addTearDown(() async {
        await cubit.close();
        await repository.dispose();
      });
    });

    test('reads what is offered, and the own assistants as they '
        'change', () async {
      await cubit.load();
      expect(cubit.state.loading, isFalse);
      expect(cubit.state.offer.assistants, [_claude]);
      expect(cubit.state.showsAnything, isTrue);

      expect(await cubit.saveOwn(_own), OwnAssistantSaved.kept);
      await pumpEventQueue();
      expect(cubit.state.own, [_own]);

      await cubit.removeOwn('own-1');
      await pumpEventQueue();
      expect(cubit.state.own, isEmpty);
    });

    test('shows nothing where nothing is offered, own keys are not '
        'allowed, and none are kept', () async {
      gateway.offer = AssistantsOffer.none;
      await cubit.load();

      expect(cubit.state.showsAnything, isFalse);
    });

    test("a key isn't kept where the settings wouldn't be sealed", () async {
      store.unsealed = true;

      expect(await cubit.saveOwn(_own), OwnAssistantSaved.refused);
      expect(store.assistants, isEmpty);
    });

    test('agreeing reads the offer anew', () async {
      await cubit.load();
      await cubit.agree('claude');

      expect(cubit.state.offer.assistants.single.agreed, isTrue);
      expect(cubit.state.agreeing, isNull);
      expect(cubit.state.problem, isNull);
    });

    test('a refused agreement is the problem, the offer as it was', () async {
      await cubit.load();
      gateway.failing = const AssistantFailed(AssistantProblem.notAllowed);

      await cubit.agree('claude');

      expect(
        cubit.state.problem,
        const AssistantFailed(AssistantProblem.notAllowed),
      );
      expect(cubit.state.agreeing, isNull);
    });

    test("an offer that can't be read offers nothing", () async {
      gateway.failing = const AssistantFailed(AssistantProblem.failed);
      await cubit.load();

      expect(
        cubit.state.unreadable,
        const AssistantFailed(AssistantProblem.failed),
      );
      expect(cubit.state.offer, AssistantsOffer.none);
    });

    test('an app keeping no own assistants keeps none', () async {
      final without = AssistantsCubit(repository);
      addTearDown(without.close);

      expect(await without.saveOwn(_own), OwnAssistantSaved.failed);
    });
  });

  group('AssistantGrantsCubit', () {
    late FakeAssistantOperatorGateway gateway;
    late FakeInstanceOperatorGateway accounts;
    late AssistantOperatorRepository repository;
    late AssistantGrantsCubit cubit;

    setUp(() {
      gateway = FakeAssistantOperatorGateway()
        ..set = _setUp
        ..accounts.addAll({'anna': 'anna'});
      accounts = FakeInstanceOperatorGateway()
        ..operates = true
        ..add(
          OperatedAccount(id: 'anna', handle: 'anna', since: DateTime(2026)),
        );
      repository = AssistantOperatorRepository(gateway, accounts);
      cubit = AssistantGrantsCubit(repository);
      addTearDown(() async {
        await cubit.close();
        await repository.dispose();
      });
    });

    test('reads the assistants set and the grants', () async {
      await cubit.load();

      expect(cubit.state.setUp, _setUp);
      expect(cubit.state.grants, isEmpty);
      expect(cubit.state.showsAnything, isTrue);
    });

    test('shows nothing without an assistant set or a grant', () async {
      gateway.set = const AssistantsSetUp();
      await cubit.load();

      expect(cubit.state.showsAnything, isFalse);
    });

    test('granting by handle reads the grants anew', () async {
      await cubit.load();
      final failed = await cubit.grant(
        handle: 'anna',
        assistant: 'claude',
        dailyLimit: 1000000,
        monthlyLimit: null,
      );

      expect(failed, isNull);
      expect(cubit.state.grants.single.account, 'anna');
      expect(cubit.state.busy, isNull);
    });

    test("a handle nobody has is the sheet's to say, not the "
        "screen's", () async {
      await cubit.load();
      final failed = await cubit.grant(
        handle: 'bob',
        assistant: 'claude',
        dailyLimit: null,
        monthlyLimit: null,
      );

      expect(failed, const OperatorFailed(OperatorProblem.notFound));
      expect(cubit.state.problem, isNull);
      expect(cubit.state.grants, isEmpty);
    });

    test('changes the limits, and takes a grant back', () async {
      await cubit.load();
      await cubit.grant(
        handle: 'anna',
        assistant: 'claude',
        dailyLimit: 1,
        monthlyLimit: 2,
      );

      expect(
        await cubit.changeLimits(
          cubit.state.grants.single,
          dailyLimit: 5,
          monthlyLimit: null,
        ),
        isNull,
      );
      expect(cubit.state.grants.single.dailyLimit, 5);
      expect(cubit.state.grants.single.monthlyLimit, isNull);

      await cubit.revoke(cubit.state.grants.single);
      expect(cubit.state.grants, isEmpty);
    });

    test("taking back what isn't granted any more is the screen's "
        'problem', () async {
      await cubit.load();
      await cubit.revoke(
        AssistantGrant(
          account: 'anna',
          assistant: 'claude',
          grantedAt: DateTime.utc(2026, 10, 25),
        ),
      );

      expect(
        cubit.state.problem,
        const OperatorFailed(OperatorProblem.notFound),
      );
    });

    test("someone who doesn't operate the instance reads nothing", () async {
      gateway.failing = const OperatorFailed(OperatorProblem.notAllowed);
      await cubit.load();

      expect(
        cubit.state.unreadable,
        const OperatorFailed(OperatorProblem.notAllowed),
      );
      expect(cubit.state.showsAnything, isFalse);
    });
  });

  group('AssistantUseCubit', () {
    test('offers this UTC month and the two before, and reads the one '
        'shown', () async {
      final asked = <DateTime>[];
      final use = AssistantUse(
        assistant: 'claude',
        month: DateTime.utc(2026),
        requests: 2,
      );
      final cubit = withClock(
        Clock.fixed(DateTime.utc(2026, 1, 31, 23, 30)),
        () => AssistantUseCubit((month) async {
          asked.add(month);
          return [use];
        }),
      );
      addTearDown(cubit.close);

      expect(cubit.state.months, [
        DateTime.utc(2026),
        DateTime.utc(2025, 12),
        DateTime.utc(2025, 11),
      ]);
      await cubit.show();
      expect(cubit.state.use, [use]);
      expect(cubit.state.loading, isFalse);

      await cubit.show(DateTime.utc(2025, 11));
      expect(cubit.state.month, DateTime.utc(2025, 11));
      expect(asked, [DateTime.utc(2026), DateTime.utc(2025, 11)]);
    });

    test("says when the use couldn't be read", () async {
      final cubit = AssistantUseCubit(
        (month) async => throw const AssistantFailed(AssistantProblem.failed),
      );
      addTearDown(cubit.close);

      await cubit.show();

      expect(cubit.state.failed, isTrue);
      expect(cubit.state.use, isEmpty);
    });
  });
}