import { createSlice, PayloadAction } from '@reduxjs/toolkit';
import { ThemeType } from '../../types/theme';
import { 
  LIGHT_THEME, 
  DARK_THEME, 
  PINK_THEME, 
  BLUE_THEME, 
  GREEN_THEME, 
  PURPLE_THEME,
  THEMES,
  getNextTheme
} from '../../utils/themes';

// Ключ для хранения текущей темы в localStorage
const THEME_STORAGE_KEY = 'journal-pl-theme';

// Получаем сохраненную тему из localStorage или используем светлую тему по умолчанию
const getSavedTheme = (): ThemeType => {
  if (typeof window !== 'undefined') {
    const savedTheme = localStorage.getItem(THEME_STORAGE_KEY) as ThemeType | null;
    if (savedTheme && THEMES.includes(savedTheme as ThemeType)) {
      return savedTheme as ThemeType;
    }
  }
  // По умолчанию используем светлую тему
  return LIGHT_THEME;
};

interface ThemeState {
  currentTheme: ThemeType;
}

const initialState: ThemeState = {
  currentTheme: getSavedTheme(),
};

export const themeSlice = createSlice({
  name: 'theme',
  initialState,
  reducers: {
    setTheme: (state, action: PayloadAction<ThemeType>) => {
      state.currentTheme = action.payload;
      
      // Сохраняем выбранную тему в localStorage
      if (typeof window !== 'undefined') {
        localStorage.setItem(THEME_STORAGE_KEY, action.payload);
      }
    },
    cycleNextTheme: (state) => {
      state.currentTheme = getNextTheme(state.currentTheme);
      
      // Сохраняем выбранную тему в localStorage
      if (typeof window !== 'undefined') {
        localStorage.setItem(THEME_STORAGE_KEY, state.currentTheme);
      }
    },
  },
});

export const { setTheme, cycleNextTheme } = themeSlice.actions;

// Селекторы для получения информации о текущей теме
export const selectCurrentTheme = (state: { theme: ThemeState }) => state.theme.currentTheme;
export const selectIsLightVariant = (state: { theme: ThemeState }) => 
  [LIGHT_THEME, PINK_THEME, BLUE_THEME, GREEN_THEME].includes(state.theme.currentTheme);
export const selectIsDarkVariant = (state: { theme: ThemeState }) => 
  [DARK_THEME, PURPLE_THEME].includes(state.theme.currentTheme);

export default themeSlice.reducer;