import 'dart:convert';
import 'package:flutter_test/flutter_test.dart';
import 'package:drift/native.dart';
import 'package:motorcycle_dash/core/version/app_identity.dart';
import 'package:motorcycle_dash/core/app_info.dart';
import 'package:motorcycle_dash/database/database.dart' hide FieldTestEvent, FieldTestSummary, TelemetrySample;
import 'package:motorcycle_dash/models/telemetry_sample.dart';
import 'package:motorcycle_dash/services/field_test/field_test_logger.dart';
import 'package:motorcycle_dash/services/field_test/field_test_export_service.dart';
import 'package:motorcycle_dash/services/field_test/field_test_replay_service.dart';
import 'package:motorcycle_dash/services/validation/telemetry_validator.dart';

void main() {
  TestWidgetsFlutterBinding.ensureInitialized();

  late AppDatabase db;
  late FieldTestLogger logger;
  late FieldTestExportService exportService;
  late FieldTestReplayService replayService;

  setUp(() {
    db = AppDatabase.forTesting(NativeDatabase.memory());
    logger = FieldTestLogger(db);
    exportService = FieldTestExportService(db);
    replayService = FieldTestReplayService(validator: TelemetryValidator());
  });

  tearDown(() async {
    logger.dispose();
    await db.close();
  });

  group('Production Versioning & Identity System Tests', () {
    // 1. Semantic version parsing
    test('1. Semantic version parsing conforms to MAJOR.MINOR.PATCH format', () {
      final identity = AppIdentity.current();
      final parts = identity.semanticVersion.split('.');
      expect(parts.length, 3);
      expect(int.tryParse(parts[0]), isNotNull);
      expect(int.tryParse(parts[1]), isNotNull);
      expect(int.tryParse(parts[2]), isNotNull);
    });

    // 2. Build number handling
    test('2. Build number is a valid positive integer', () {
      final identity = AppIdentity.current();
      expect(identity.buildNumber, isPositive);
      expect(identity.buildNumber, greaterThanOrEqualTo(100));
    });

    // 3. Git SHA handling
    test('3. Git SHA is captured with valid 40-char full hash representation', () {
      final identity = AppIdentity.current();
      expect(identity.gitCommit, isNotEmpty);
      expect(identity.displayString.contains(identity.gitCommit.substring(0, 8)), isTrue);
    });

    // 4. Missing Git metadata handling
    test('4. Deserialization with missing Git metadata gracefully falls back to unknown', () {
      final fallbackJson = {
        'version': '1.0.0',
        'build': 100,
      };
      final fallback = AppIdentity.fromJson(fallbackJson);
      expect(fallback.gitCommit, 'unknown');
      expect(fallback.gitBranch, 'unknown');
      expect(fallback.releaseChannel, 'release');
      expect(fallback.telemetrySchemaVersion, 5);
      expect(fallback.exportSchemaVersion, 1);
    });

    // 5. Release-channel handling
    test('5. Release channel is recognized from environment or runtime mode', () {
      final identity = AppIdentity.current();
      expect(['debug', 'profile', 'release', 'beta', 'production'].contains(identity.releaseChannel), isTrue);
    });

    // 6. Schema-version separation
    test('6. Database schema version, telemetry schema, and export schema are independent', () {
      final identity = AppIdentity.current();
      expect(identity.telemetrySchemaVersion, 5);
      expect(identity.exportSchemaVersion, 1);
      expect(identity.semanticVersion, '1.0.0');
      // Verify changing app version does not change schema versions
      const customIdentity = AppIdentity(
        semanticVersion: '2.0.0',
        buildNumber: 200,
        gitCommit: 'abc123456789',
        gitBranch: 'feature',
        releaseChannel: 'beta',
        telemetrySchemaVersion: 5,
        exportSchemaVersion: 1,
        buildTimestamp: '2026-08-28T05:00:00Z',
      );
      expect(customIdentity.telemetrySchemaVersion, 5);
      expect(customIdentity.exportSchemaVersion, 1);
    });

    // 7. Field-test session identity capture
    test('7. Field test session captures immutable software identity on startSession', () async {
      const rideId = 777;
      logger.startSession(rideId, notes: 'Field test readiness session');
      
      expect(logger.sessionIdentity.semanticVersion, '1.0.0');
      expect(logger.sessionIdentity.buildNumber, 100);
      expect(logger.sessionIdentity.telemetrySchemaVersion, 5);

      await logger.flush();
      final events = await (db.select(db.fieldTestEvents)..where((e) => e.rideId.equals(rideId))).get();
      final startEvent = events.firstWhere((e) => e.eventType == 'RIDE_STARTED');
      expect(startEvent.message.contains('1.0.0+100'), isTrue);
      final meta = jsonDecode(startEvent.metadata!);
      expect(meta['software']['version'], '1.0.0');
      expect(meta['software']['build'], 100);
    });

    // 8. Export metadata verification
    test('8. Forensic export JSON contains comprehensive software identity object', () async {
      const rideId = 888;
      logger.startSession(rideId);
      final sample = TelemetrySample(
        timestamp: DateTime(2026, 8, 28, 9, 0, 0),
        speed: 45.0,
        latitude: 37.7749,
        longitude: -122.4194,
        gpsAccuracy: 3.0,
      );
      logger.processTelemetrySample(sample, TelemetryValidator().validate(sample));
      await logger.flush();

      final jsonString = await exportService.generateFieldTestSessionJson(rideId);
      final Map<String, dynamic> data = jsonDecode(jsonString);

      expect(data['software'], isNotNull);
      expect(data['software']['version'], '1.0.0');
      expect(data['software']['build'], 100);
      expect(data['software']['telemetrySchemaVersion'], 5);
      expect(data['software']['exportSchemaVersion'], 1);
    });

    // 9. Replay compatibility
    test('9. Replay engine evaluates export schema compatibility safely', () {
      expect(AppIdentity.checkExportCompatibility(1), ExportCompatibility.supported);
      expect(AppIdentity.checkExportCompatibility(2), ExportCompatibility.unsupported);
      expect(AppIdentity.checkExportCompatibility(0), ExportCompatibility.unknown);
    });

    // 10. Version metadata consistency
    test('10. AppInfo and AppIdentity maintain consistent fallback and single source of truth', () {
      final identity = AppInfo.identity;
      expect(AppInfo.fallbackVersion, '1.0.0+100');
      expect(identity.semanticVersion, '1.0.0');
      expect(identity.buildNumber, 100);
    });

    // 11. Release manifest generation
    test('11. Release manifest contains all required metadata attributes', () {
      final manifest = AppIdentity.current().generateReleaseManifest();
      expect(manifest['application'], 'MotorSignal');
      expect(manifest['version'], '1.0.0');
      expect(manifest['build'], 100);
      expect(manifest['gitCommit'], isNotEmpty);
      expect(manifest['telemetrySchema'], 5);
      expect(manifest['exportSchema'], 1);
      expect(manifest['buildTimestamp'], isNotEmpty);
    });

    // 12. Existing exports remaining readable
    test('12. Legacy export payloads without explicit software block remain readable', () async {
      final legacyExportJson = jsonEncode({
        'exportVersion': '1.0.0',
        'generatedAt': '2026-08-28T04:00:00Z',
        'rideMetadata': {'id': 1},
        'events': [
          {
            'timestamp': '2026-08-28T04:00:00.000Z',
            'latitude': 37.7749,
            'longitude': -122.4194,
            'speed': 35.0,
            'gpsAccuracy': 3.0,
          }
        ]
      });

      final result = await replayService.replaySessionJson(legacyExportJson);
      expect(result.totalSamples, 1);
      expect(result.validSamples, 1);
      expect(result.exportCompatibility, ExportCompatibility.supported);
    });
  });
}