/// Design system constants for FocusBuddy app
///
/// This file contains all magic numbers extracted from the codebase
/// to ensure consistency and maintainability.
library;

/// Spacing constants following 8px grid system
class AppSpacing {
  AppSpacing._();

  static const double xs = 4.0;
  static const double sm = 8.0;
  static const double md = 12.0;
  static const double base = 16.0;
  static const double lg = 20.0;
  static const double xl = 24.0;
  static const double xxl = 32.0;
  static const double xxxl = 40.0;
  static const double huge = 48.0;
  static const double massive = 60.0;
  static const double gigantic = 80.0;
}

/// Duration-related constants
class AppDurations {
  AppDurations._();

  // Default focus session duration (minutes)
  static const int defaultFocusDuration = 25;

  // Available duration options (minutes)
  static const List<int> availableDurations = [15, 25, 45];

  // Timer tick interval
  static const Duration timerTickInterval = Duration(seconds: 1);

  // Seconds per minute (for conversions)
  static const int secondsPerMinute = 60;

  // Notification update interval when app is backgrounded
  static const int notificationUpdateIntervalSeconds = 30;

  // Animation durations
  static const Duration pageTransition = Duration(milliseconds: 300);

  // SnackBar display durations
  static const Duration snackBarShort = Duration(seconds: 2);
  static const Duration snackBarMedium = Duration(seconds: 3);
}

/// Onboarding screen constants
class OnboardingConstants {
  OnboardingConstants._();

  static const int totalPages = 3;
  static const double horizontalPadding = 32.0;
  static const double emojiSize = 80.0;
  static const double indicatorWidth = 24.0;
  static const double indicatorHeight = 4.0;
  static const double indicatorActiveWidth = 8.0;
  static const double indicatorActiveHeight = 8.0;
}

/// Settings screen constants
class SettingsConstants {
  SettingsConstants._();

  static const double iconSize = 16.0;
  static const double sectionSpacing = 20.0;
  static const double optionHeight = 12.0;
  static const double optionSpacing = 2.0;
  static const double radioButtonSize = 20.0;
  static const double radioCheckIconSize = 12.0;
  static const double badgeFontSize = 12.0;
}

/// Profile screen constants
class ProfileConstants {
  ProfileConstants._();

  static const double avatarRadius = 40.0;
  static const double avatarEmojiSize = 40.0;
  static const double statDividerHeight = 40.0;
  static const double progressBarHeight = 10.0;
  static const double progressBarRadius = 5.0;
  static const double calendarCellSize = 40.0;
  static const int calendarDisplayDays = 28;
  static const int maxDisplayedAchievements = 6;

  // Check-in milestones
  static const int weeklyCheckInMilestone = 7;
}

/// Completion screen constants
class CompletionConstants {
  CompletionConstants._();

  static const double emojiSize = 64.0;
}

/// Calendar constants (shared between profile and session detail)
class CalendarConstants {
  CalendarConstants._();

  static const int displayDays = 28;
  static const int daysOffset = 27; // displayDays - 1
}

/// Points and gamification constants
class GameConstants {
  GameConstants._();

  // Points calculation
  static const int pointsPerFocusMinute = 1;
  static const int honestyBonusMinutesPerDistraction = 10;

  // Check-in rewards
  static const int checkInBasePoints = 5;
  static const int weeklyStreakDays = 7;
  static const int weeklyStreakBonus = 30;
  static const int monthlyStreakDays = 30;
  static const int monthlyStreakBonus = 100;

  // Level progression
  static const int pointsPerLevel = 100;
}

/// Notification IDs
class NotificationIds {
  NotificationIds._();

  static const int complete = 0;
  static const int reminder = 1;
  static const int ongoing = 2;
}

/// Icon sizes
class IconSizes {
  IconSizes._();

  static const double small = 12.0;
  static const double medium = 16.0;
  static const double large = 20.0;
  static const double extraLarge = 24.0;
}

/// Font sizes (complementing AppTextStyles)
class FontSizes {
  FontSizes._();

  static const double caption = 12.0;
  static const double body = 14.0;
  static const double bodyLarge = 16.0;
  static const double subtitle = 18.0;
  static const double title = 20.0;
  static const double heading = 28.0;
  static const double display = 32.0;
}

/// Border radius values
class BorderRadii {
  BorderRadii._();

  static const double small = 8.0;
  static const double medium = 12.0;
  static const double large = 16.0;
  static const double extraLarge = 24.0;
  static const double circular = 999.0;
}