// Author: fruit.com.cn

import 'dart:math';

import 'package:flutter/material.dart';
import 'package:flutter/services.dart';
import 'package:flutter_test/flutter_test.dart';
import 'package:fruitshorts/app.dart';
import 'package:fruitshorts/core/theme/app_colors.dart';
import 'package:fruitshorts/core/theme/app_dimens.dart';
import 'package:fruitshorts/core/theme/app_theme.dart';

double _contrast(Color foreground, Color background) {
  final first = foreground.computeLuminance();
  final second = background.computeLuminance();
  return (max(first, second) + 0.05) / (min(first, second) + 0.05);
}

void main() {
  test('should_expose_dark_visual_tokens', () {
    expect(AppColors.blue, const Color(0xFFFF6B2C));
    expect(AppColors.bluePressed, const Color(0xFFE55A1F));
    expect(AppColors.secondary, const Color(0xFFB0B0B0));
    expect(AppColors.ink, const Color(0xFF000000));
    expect(AppColors.card, const Color(0xFF16161A));
    expect(AppColors.cardAlt, const Color(0xFF101010));
    expect(AppColors.raised, const Color(0xFF1C1C1E));
    expect(AppColors.border, const Color(0xFF1C1C1E));
    expect(AppColors.skeletonSurface, const Color(0xFF0E0E0E));
    expect(AppColors.skeletonMedia, const Color(0xFF1C1C1E));
    expect(AppColors.textPrimary, const Color(0xFFFFFFFF));
    expect(AppColors.textSecondary, const Color(0xFFB0B0B0));
    expect(AppColors.textTertiary, const Color(0xFF8E8E93));
    expect(AppColors.onSurface, const Color(0xEBFFFFFF));
    expect(AppColors.muted, const Color(0xA3FFFFFF));
    expect(AppColors.subtle, const Color(0x61FFFFFF));
    expect(AppDimens.cardRadius, 12);
    expect(AppDimens.buttonRadius, 10);
    expect(AppDimens.inputRadius, 10);
    expect(AppDimens.chipRadius, 6);
  });

  test('should_keep_primary_and_secondary_text_readable_on_dark', () {
    expect(
      _contrast(AppColors.onSurface, AppColors.ink),
      greaterThanOrEqualTo(4.5),
    );
    expect(
      _contrast(AppColors.onSurface, AppColors.card),
      greaterThanOrEqualTo(4.5),
    );
    expect(_contrast(AppColors.muted, AppColors.card), greaterThanOrEqualTo(3));
    expect(_contrast(AppColors.gold, AppColors.ink), greaterThanOrEqualTo(3));
    expect(_contrast(AppColors.blue, AppColors.ink), greaterThanOrEqualTo(3));
  });

  test('should_use_dark_color_scheme_and_light_system_icons', () {
    final theme = AppTheme.dark();

    expect(theme.brightness, Brightness.dark);
    expect(theme.colorScheme.primary, AppColors.blue);
    expect(theme.colorScheme.onPrimary, AppColors.onPrimary);
    expect(theme.colorScheme.secondary, AppColors.secondary);
    expect(theme.colorScheme.surface, AppColors.ink);
    expect(theme.colorScheme.onSurface, AppColors.onSurface);
    expect(theme.colorScheme.outline, AppColors.border);
    expect(theme.scaffoldBackgroundColor, AppColors.ink);
    expect(theme.appBarTheme.backgroundColor, AppColors.transparent);
    expect(theme.appBarTheme.systemOverlayStyle, SystemUiOverlayStyle.light);
    expect(theme.cardTheme.elevation, 0);
    expect(theme.dialogTheme.backgroundColor, AppColors.raised);
    expect(
      theme.bottomNavigationBarTheme.backgroundColor,
      AppColors.navBackground,
    );
    expect(theme.inputDecorationTheme.fillColor, AppColors.input);
  });

  test('should_use_ink_navigation_bar_with_light_icons', () {
    expect(appSystemOverlayStyle.statusBarColor, Colors.transparent);
    expect(appSystemOverlayStyle.statusBarIconBrightness, Brightness.light);
    expect(appSystemOverlayStyle.systemNavigationBarColor, AppColors.ink);
    expect(
      appSystemOverlayStyle.systemNavigationBarDividerColor,
      Colors.transparent,
    );
    expect(
      appSystemOverlayStyle.systemNavigationBarIconBrightness,
      Brightness.light,
    );
    expect(appSystemOverlayStyle.systemNavigationBarContrastEnforced, isFalse);

    final sheetTheme = AppTheme.dark().bottomSheetTheme;
    expect(sheetTheme.backgroundColor, Colors.transparent);
    expect(sheetTheme.modalBackgroundColor, Colors.transparent);
    expect(sheetTheme.surfaceTintColor, Colors.transparent);
  });

  test('should_expose_flat_page_gradient_without_card_shadow', () {
    expect(AppTheme.pageGradient.colors, [
      AppColors.mineGradientTop,
      AppColors.mineGradientMiddle,
      AppColors.mineGradientBottom,
    ]);
    expect(AppTheme.pageGradient.stops, [0, 0.4, 0.75]);
    expect(AppTheme.cardShadow.color, AppColors.cardShadow);
    expect(AppTheme.cardShadow.blurRadius, 0);
    expect(AppTheme.cardShadow.offset, Offset.zero);
  });
}