export type Habit = {
  id: string
  name: string
  description: string
  frequency: string
  coinReward: number
  targetCompletions?: number // Optional field, default to 1
  completions: string[] // Array of UTC ISO date strings
  isTask?: boolean // mark the habit as a task
}


export type Freq = 'daily' | 'weekly' | 'monthly' | 'yearly'

export type WishlistItemType = {
  id: string
  name: string
  description: string
  coinCost: number
}

export type TransactionType = 'HABIT_COMPLETION' | 'HABIT_UNDO' | 'WISH_REDEMPTION' | 'MANUAL_ADJUSTMENT' | 'TASK_COMPLETION' | 'TASK_UNDO';

export interface CoinTransaction {
  id: string;
  amount: number;
  type: TransactionType;
  description: string;
  timestamp: string;
  relatedItemId?: string;
  note?: string;
}

export interface HabitsData {
  habits: Habit[];
}


export interface CoinsData {
  balance: number;
  transactions: CoinTransaction[];
}

// Default value functions
// Data container types
export interface WishlistData {
  items: WishlistItemType[];
}

// Default value functions
export const getDefaultHabitsData = (): HabitsData => ({
  habits: []
});


export const getDefaultCoinsData = (): CoinsData => ({
  balance: 0,
  transactions: []
});

export const getDefaultWishlistData = (): WishlistData => ({
  items: []
});

export const getDefaultSettings = (): Settings => ({
  ui: {
    useNumberFormatting: true,
    useGrouping: true,
  },
  system: {
    timezone: Intl.DateTimeFormat().resolvedOptions().timeZone,
    weekStartDay: 1 // Monday
  },
  profile: {}
});

// Map of data types to their default values
export const DATA_DEFAULTS = {
  wishlist: getDefaultWishlistData,
  habits: getDefaultHabitsData,
  coins: getDefaultCoinsData,
  settings: getDefaultSettings,
} as const;

// Type for all possible data types
export type DataType = keyof typeof DATA_DEFAULTS;

export interface UISettings {
  useNumberFormatting: boolean;
  useGrouping: boolean;
}

export type WeekDay = 0 | 1 | 2 | 3 | 4 | 5 | 6; // 0 = Sunday, 6 = Saturday

export interface SystemSettings {
  timezone: string;
  weekStartDay: WeekDay;
}

export interface ProfileSettings {
  avatarPath?: string;
}

export interface Settings {
  ui: UISettings;
  system: SystemSettings;
  profile: ProfileSettings;
}

export type ViewType = 'habits' | 'tasks'

export interface JotaiHydrateInitialValues {
  settings: Settings;
  coins: CoinsData;
  habits: HabitsData;
  wishlist: WishlistData;
}