import 'package:flutter_test/flutter_test.dart';
import 'package:kouyu_english/core/app_state.dart';
import 'package:kouyu_english/core/models.dart';

void main() {
  test(
    'listening help survives resume and cannot earn independent evidence',
    () {
      final first = AppState()..lessonStep = LessonStep.listening;
      first.recordListeningPlayback(slow: true);
      first.revealListeningTranscript();
      first.recordListeningMiss();

      final resumed = AppState()..restoreForTest(first.snapshotForTest());
      expect(resumed.listeningAudioPlayed, isTrue);
      expect(resumed.listeningSupport, ListeningSupport.transcript);
      expect(resumed.listeningAttempts, 1);

      resumed.completeListening(recognized: true);
      final evidence = resumed.attemptEvidence
          .where((item) => item.taskId.endsWith('listening-check'))
          .toList();
      expect(evidence, isNotEmpty);
      expect(
        evidence.every((item) => item.outcome == EvidenceKind.assisted),
        isTrue,
      );
      expect(evidence.first.listeningSupport, ListeningSupport.transcript);
      expect(evidence.first.firstTry, isFalse);
      expect(evidence.first.attemptCount, 2);
    },
  );

  test('unaided first listening answer earns recognition evidence', () {
    final state = AppState()..lessonStep = LessonStep.listening;
    state.recordListeningPlayback();
    state.completeListening(recognized: true);
    final evidence = state.attemptEvidence
        .where((item) => item.taskId.endsWith('listening-check'))
        .toList();
    expect(evidence, isNotEmpty);
    expect(
      evidence.every((item) => item.outcome == EvidenceKind.independentSuccess),
      isTrue,
    );
    expect(evidence.first.firstTry, isTrue);
  });

  test('a choice without playable audio cannot earn listening recognition', () {
    final state = AppState()..lessonStep = LessonStep.listening;
    state.completeListening(recognized: true);
    final evidence = state.attemptEvidence
        .where((item) => item.taskId.endsWith('listening-check'))
        .toList();
    expect(
      evidence.every((item) => item.outcome == EvidenceKind.assisted),
      isTrue,
    );
  });

  test(
    'TTS failure survives resume and gives only assisted listening credit',
    () {
      final state = AppState()..lessonStep = LessonStep.listening;
      state.recordListeningAudioUnavailable();
      final resumed = AppState()..restoreForTest(state.snapshotForTest());
      expect(resumed.listeningAudioUnavailable, isTrue);
      expect(resumed.listeningSupport, ListeningSupport.transcript);
      resumed.completeListening(recognized: true);
      expect(resumed.lessonStep, LessonStep.speaking);
      expect(resumed.listeningAudioUnavailable, isFalse);
      expect(
        resumed.attemptEvidence
            .where((entry) => entry.taskId.endsWith('listening-check'))
            .every((entry) => entry.outcome == EvidenceKind.assisted),
        isTrue,
      );
    },
  );

  test('skipping follow-reading does not create speaking evidence', () {
    final state = AppState()..lessonStep = LessonStep.speaking;
    state.completeSpeaking();
    expect(state.lessonStep, LessonStep.reading);
    expect(
      state.attemptEvidence.where(
        (entry) => entry.taskId.endsWith('-speaking'),
      ),
      isEmpty,
    );
  });

  test('the fourth checkpoint keeps its 30-day audit interval', () {
    final state = AppState();
    state.reviewQueue.add(
      ReviewItem(
        id: 'A0-P02',
        target: "What's your name?",
        prompt: '问名字',
        hint: "What's your name?",
        dueAt: DateTime.now().subtract(const Duration(days: 1)),
        skill: '回忆表达',
        successfulReviews: 3,
      ),
    );

    state.completeReview(
      state.reviewQueue.single,
      assisted: false,
      firstTry: true,
      attemptCount: 1,
      rawAnswer: "What's your name?",
    );
    final next = state.reviewQueue.single;
    expect(next.successfulReviews, 4);
    expect(
      next.dueAt.difference(DateTime.now()).inDays,
      inInclusiveRange(29, 30),
    );
    expect(state.attemptEvidence.last.firstTry, isTrue);
    expect(state.attemptEvidence.last.attemptCount, 1);
  });

  test('later clean mastery audits lengthen to 45 days', () {
    final state = AppState();
    state.reviewQueue.add(
      ReviewItem(
        id: 'A0-P02',
        target: "What's your name?",
        prompt: '问名字',
        hint: "What's your name?",
        dueAt: DateTime.now().subtract(const Duration(days: 1)),
        skill: '回忆表达',
        successfulReviews: 4,
      ),
    );
    state.completeReview(
      state.reviewQueue.single,
      assisted: false,
      firstTry: true,
      attemptCount: 1,
      rawAnswer: "What's your name?",
    );
    expect(
      state.reviewQueue.single.dueAt.difference(DateTime.now()).inDays,
      inInclusiveRange(44, 45),
    );
  });

  test(
    'slow dictation cannot advance a checkpoint even if caller says independent',
    () {
      final state = AppState();
      state.reviewQueue.add(
        ReviewItem(
          id: 'A0-P02',
          target: "What's your name?",
          prompt: '听写',
          hint: "What's your name?",
          dueAt: DateTime.now().subtract(const Duration(days: 1)),
          skill: '听写',
        ),
      );
      state.completeReview(
        state.reviewQueue.single,
        assisted: false,
        firstTry: true,
        attemptCount: 1,
        listeningSupport: ListeningSupport.slow,
        rawAnswer: "What's your name?",
      );
      expect(state.reviewQueue.single.successfulReviews, 0);
      expect(state.attemptEvidence.last.outcome, EvidenceKind.assisted);
      expect(
        state.attemptEvidence.last.listeningSupport,
        ListeningSupport.slow,
      );
    },
  );
}