import 'package:drift/native.dart';
import 'package:flutter_test/flutter_test.dart';
import 'package:kouyu_english/core/local_store.dart';
import 'dart:convert';

void main() {
  test(
    'a legacy snapshot migrates into canonical entities without replacement',
    () async {
      final executor = NativeDatabase.memory();
      final store = LocalSnapshotStore.forTesting(executor);
      const legacy = '''{
      "onboardingComplete": true,
      "lessonStep": "reading",
      "activeLessonId": "a0-02",
      "attemptEvidence": [],
      "mastery": [],
      "reviews": []
    }''';

      // Open the schema first, then model the row left by a pre-entity build.
      expect(await store.read(), isNull);
      await executor.runCustom(
        '''INSERT INTO learning_snapshots(snapshot_id, schema_version, payload, updated_at)
         VALUES (?, ?, ?, ?)''',
        const ['current', 1, legacy, '2026-09-14T00:00:00.000Z'],
      );
      expect(await store.read(), legacy);

      await store.write(legacy);
      final restored =
          jsonDecode((await store.read())!) as Map<String, dynamic>;
      expect(restored['activeLessonId'], 'a0-02');
      expect(restored['onboardingComplete'], isTrue);
      expect(
        await executor.runSelect(
          'SELECT payload FROM learning_snapshots WHERE snapshot_id = ?',
          const ['current'],
        ),
        [
          <String, Object?>{'payload': legacy},
        ],
      );
      expect(
        await executor.runSelect(
          'SELECT profile_id FROM learner_profiles',
          const [],
        ),
        [
          <String, Object?>{'profile_id': 'current'},
        ],
      );
      await executor.close();
    },
  );

  test(
    'SQLite entity store restores canonical state without writing a snapshot',
    () async {
      final executor = NativeDatabase.memory();
      final store = LocalSnapshotStore.forTesting(executor);

      expect(await store.read(), isNull);
      const first = '''{
      "revision": 1,
      "attemptEvidence": [{"id":"a1","itemId":"A0-P01","taskId":"t1","skill":"speaking","inputMode":"speechToText","outcome":"independentSuccess","createdAt":"2026-09-14T00:00:00.000Z","assisted":false,"variantIndex":0,"originalTranscript":"Hello","transcriptConfirmed":true,"transcriptEdited":false}],
      "mastery": [{"id":"A0-P01","label":"Hello","status":"recognize","checkpoint":1,"needsReview":false}],
      "reviews": [{"id":"A0-P01","dueAt":"2026-09-15T00:00:00.000Z","attempts":1,"successfulReviews":1,"variantIndex":0}],
      "temporaryLexicon": [{"query":"library","definition":"图书馆","provider":"compatible","model":"demo","createdAt":"2026-09-14T00:00:00.000Z"}],
      "lessonStep":"speaking", "activeLessonId":"a0-01"
      }''';
      await store.write(first);
      final restored =
          jsonDecode((await store.read())!) as Map<String, dynamic>;
      expect(restored['lessonStep'], 'speaking');
      expect(restored['attemptEvidence'], hasLength(1));
      expect(restored['mastery'], hasLength(1));
      expect(
        await executor.runSelect(
          'SELECT snapshot_id FROM learning_snapshots',
          const [],
        ),
        isEmpty,
      );
      expect(
        await executor.runSelect(
          'SELECT item_id FROM attempt_evidence',
          const [],
        ),
        [
          <String, Object?>{'item_id': 'A0-P01'},
        ],
      );

      await executor.runCustom(
        'UPDATE learning_snapshots SET payload = ? WHERE snapshot_id = ?',
        const ['{"corrupt":"backup only"}', 'current'],
      );
      final canonicalAfterSnapshotChange =
          jsonDecode((await store.read())!) as Map<String, dynamic>;
      expect(canonicalAfterSnapshotChange['mastery'], hasLength(1));
      expect(
        await executor.runSelect(
          'SELECT original_transcript, transcript_confirmed, transcript_edited FROM attempt_evidence',
          const [],
        ),
        [
          <String, Object?>{
            'original_transcript': 'Hello',
            'transcript_confirmed': 1,
            'transcript_edited': 0,
          },
        ],
      );
      expect(
        await executor.runSelect(
          'SELECT definition FROM temporary_lexicon_entries',
          const [],
        ),
        [
          <String, Object?>{'definition': '图书馆'},
        ],
      );
      expect(
        await executor.runSelect('SELECT status FROM mastery_items', const []),
        [
          <String, Object?>{'status': 'recognize'},
        ],
      );
      expect(
        await executor.runSelect('SELECT item_id FROM review_items', const []),
        [
          <String, Object?>{'item_id': 'A0-P01'},
        ],
      );
      expect(
        await executor.runSelect(
          'SELECT session_type FROM study_sessions',
          const [],
        ),
        [
          <String, Object?>{'session_type': 'lesson'},
        ],
      );

      await store.write('{"revision":2}');
      expect(
        (jsonDecode((await store.read())!)
            as Map<String, dynamic>)['attemptEvidence'],
        isEmpty,
      );

      await store.clear();
      expect(await store.read(), isNull);
      expect(
        await executor.runSelect(
          'SELECT query_key FROM temporary_lexicon_entries',
          const [],
        ),
        isEmpty,
      );
      await executor.close();
    },
  );
}