import 'package:flutter/material.dart';
import 'package:flutter_test/flutter_test.dart';
import 'package:shared_preferences/shared_preferences.dart';
import 'package:motorcycle_dash/core/theme/app_colors.dart';
import 'package:motorcycle_dash/core/theme/app_spacing.dart';
import 'package:motorcycle_dash/core/theme/app_typography.dart';
import 'package:motorcycle_dash/core/theme/theme.dart';
import 'package:motorcycle_dash/core/theme/theme_extensions.dart';
import 'package:motorcycle_dash/core/theme/theme_mode_provider.dart';

void main() {
  TestWidgetsFlutterBinding.ensureInitialized();

  group('MotorSignal Design System - Tokens & Hierarchy', () {
    test('AppColors verifies dark and light semantic palette definitions', () {
      expect(AppColors.cyberCyan, const Color(0xFF00B4D8));
      expect(AppColors.velocityBlue, const Color(0xFF0096C7));
      expect(AppColors.raceRed, const Color(0xFFFF3B30));
      expect(AppColors.darkBackground, const Color(0xFF0D0F13));
      expect(AppColors.darkSurface, const Color(0xFF13171E));
      expect(AppColors.lightBackground, const Color(0xFFF3F5F8));
      expect(AppColors.lightSurface, const Color(0xFFE9EDF2));
    });

    test('AppTypography specifies authoritative multi-font system', () {
      expect(AppTypography.fontTelemetry, 'JetBrains Mono');
      expect(AppTypography.fontHeadline, 'Sora');
      expect(AppTypography.fontBody, 'Inter');

      expect(AppTypography.speedometer.fontFamily, 'JetBrains Mono');
      expect(AppTypography.speedometer.fontSize, 96);
      expect(AppTypography.speedometer.fontWeight, FontWeight.w900);

      expect(AppTypography.headingCompass.fontFamily, 'Sora');
      expect(AppTypography.bodyMd.fontFamily, 'Inter');
      expect(AppTypography.button.fontFamily, 'Sora');
    });

    test('AppSpacing and AppRadius conform to 4dp base grid and 48dp touch targets', () {
      expect(AppSpacing.xs, 4.0);
      expect(AppSpacing.sm, 8.0);
      expect(AppSpacing.md, 12.0);
      expect(AppSpacing.lg, 16.0);
      expect(AppSpacing.xl, 24.0);
      expect(AppSpacing.minTouchTarget, 48.0);

      expect(AppRadius.sm, 4.0);
      expect(AppRadius.md, 8.0);
      expect(AppRadius.lg, 12.0);
      expect(AppRadius.xl, 16.0);
      expect(AppRadius.full, 999.0);
    });
  });

  group('MotorSignalThemeColors Extension', () {
    test('Dark and Light presets have correct brightness semantics', () {
      const dark = MotorSignalThemeColors.dark;
      expect(dark.cyberCyan, AppColors.cyberCyan);
      expect(dark.launchGreen, AppColors.launchGreen);
      expect(dark.surfaceContainer, AppColors.darkSurfaceContainer);

      const light = MotorSignalThemeColors.light;
      expect(light.cyberCyan, AppColors.technicalBlue);
      expect(light.launchGreen, AppColors.launchGreen);
      expect(light.surfaceContainer, AppColors.lightSurfaceContainer);
    });

    test('copyWith and lerp interpolate colors accurately', () {
      const dark = MotorSignalThemeColors.dark;
      final modified = dark.copyWith(cyberCyan: Colors.purple);
      expect(modified.cyberCyan, Colors.purple);
      expect(modified.velocityBlue, dark.velocityBlue);

      final lerped = dark.lerp(MotorSignalThemeColors.light, 0.5);
      expect(lerped, isA<MotorSignalThemeColors>());
      expect(lerped.cyberCyan, Color.lerp(dark.cyberCyan, MotorSignalThemeColors.light.cyberCyan, 0.5));
    });
  });

  group('AppTheme ThemeData', () {
    test('darkTheme configures Material 3 dark brightness and extensions', () {
      final theme = AppTheme.darkTheme;
      expect(theme.useMaterial3, isTrue);
      expect(theme.brightness, Brightness.dark);
      expect(theme.scaffoldBackgroundColor, AppColors.darkBackground);
      expect(theme.colorScheme.primary, AppColors.darkPrimary);

      final ext = theme.extension<MotorSignalThemeColors>();
      expect(ext, isNotNull);
      expect(ext?.cyberCyan, AppColors.cyberCyan);
    });

    test('lightTheme configures Material 3 light brightness and extensions', () {
      final theme = AppTheme.lightTheme;
      expect(theme.useMaterial3, isTrue);
      expect(theme.brightness, Brightness.light);
      expect(theme.scaffoldBackgroundColor, AppColors.lightBackground);
      expect(theme.colorScheme.primary, AppColors.lightPrimary);

      final ext = theme.extension<MotorSignalThemeColors>();
      expect(ext, isNotNull);
      expect(ext?.cyberCyan, AppColors.technicalBlue);
    });
  });

  group('ThemeMode & Persistence Provider', () {
    test('AppThemeModeNotifier defaults to ThemeMode.system and persists transitions', () async {
      SharedPreferences.setMockInitialValues({});
      final prefs = await SharedPreferences.getInstance();

      final notifier = AppThemeModeNotifier(prefs);
      expect(notifier.state, ThemeMode.system);

      await notifier.setThemeMode(ThemeMode.dark);
      expect(notifier.state, ThemeMode.dark);
      expect(prefs.getString('app_theme_mode'), 'dark');

      await notifier.setThemeMode(ThemeMode.light);
      expect(notifier.state, ThemeMode.light);
      expect(prefs.getString('app_theme_mode'), 'light');

      await notifier.toggleTheme();
      expect(notifier.state, ThemeMode.system);
    });

    test('AppThemeModeNotifier restores saved theme from SharedPreferences', () async {
      SharedPreferences.setMockInitialValues({'app_theme_mode': 'light'});
      final prefs = await SharedPreferences.getInstance();

      final notifier = AppThemeModeNotifier(prefs);
      expect(notifier.state, ThemeMode.light);
    });
  });
}