import { createSlice, createAsyncThunk, PayloadAction } from '@reduxjs/toolkit';
import { fetchI18nMessages, I18nMessages } from '../API/i18n/i18nActions';
import { getLanguageList, changeLanguage, LanguageItem } from '../API/language';
import { fetchSoftwareInfo } from '../API/softwareInfo';

export interface I18nState {
  messages: I18nMessages;
  currentLocale: string;
  supportedLocales: string[];
  loading: boolean;
  error: string | null;
  // 语言管理相关状态
  availableLanguages: LanguageItem[];
  selectedLanguage: string;
  currentSystemLocale: string; // 当前系统语言，如 "zh"
  languagesLoading: boolean;
  savingLanguage: boolean;
  languageError: string | null;
}

const initialState: I18nState = {
  messages: {},
  currentLocale: 'en_US',
  supportedLocales: ['en_US', 'zh_CN'],
  loading: false,
  error: null,
  // 语言管理初始状态
  availableLanguages: [],
  selectedLanguage: '',
  currentSystemLocale: '',
  languagesLoading: false,
  savingLanguage: false,
  languageError: null,
};

// 异步thunk：加载多语言资源
export const loadI18nMessages = createAsyncThunk(
  'i18n/loadMessages',
  async (locale: string) => {
    const messages = await fetchI18nMessages(locale);
    return { locale, messages };
  }
);

// 异步thunk：加载可用语言列表
export const loadAvailableLanguages = createAsyncThunk(
  'i18n/loadAvailableLanguages',
  async () => {
    // 同时获取语言列表和软件信息
    const [languageResponse, softwareInfo] = await Promise.all([
      getLanguageList(),
      fetchSoftwareInfo(),
    ]);

    if (languageResponse.data.code === '0x000000') {
      // 从 softwareInfo 获取当前系统语言
      const currentSystemLocale = softwareInfo.current_locale;

      return {
        languages: languageResponse.data.data,
        currentSystemLocale,
      };
    }
    throw new Error(languageResponse.data.description || '加载语言列表失败');
  }
);

// 异步thunk：更新系统语言
export const updateSystemLanguage = createAsyncThunk(
  'i18n/updateSystemLanguage',
  async (language: string) => {
    const response = await changeLanguage(language);
    if (response.data.code === '0x000000') {
      return language;
    }
    throw new Error(response.data.description || '修改语言失败');
  }
);

const i18nSlice = createSlice({
  name: 'i18n',
  initialState,
  reducers: {
    setCurrentLocale: (state, action: PayloadAction<string>) => {
      state.currentLocale = action.payload;
    },
    clearError: (state) => {
      state.error = null;
    },
    // 设置选中的语言
    setSelectedLanguage: (state, action: PayloadAction<string>) => {
      state.selectedLanguage = action.payload;
    },
    // 清除语言错误
    clearLanguageError: (state) => {
      state.languageError = null;
    },
  },
  extraReducers: (builder) => {
    builder
      // 加载多语言资源
      .addCase(loadI18nMessages.pending, (state) => {
        state.loading = true;
        state.error = null;
      })
      .addCase(loadI18nMessages.fulfilled, (state, action) => {
        state.loading = false;
        state.messages = action.payload.messages;
        state.currentLocale = action.payload.locale;
      })
      .addCase(loadI18nMessages.rejected, (state, action) => {
        state.loading = false;
        state.error = action.error.message || 'Failed to load i18n messages';
      })
      // 加载可用语言列表
      .addCase(loadAvailableLanguages.pending, (state) => {
        state.languagesLoading = true;
        state.languageError = null;
      })
      .addCase(loadAvailableLanguages.fulfilled, (state, action) => {
        state.languagesLoading = false;
        state.availableLanguages = action.payload.languages;
        state.currentSystemLocale = action.payload.currentSystemLocale;
        // 默认选中当前系统语言
        if (!state.selectedLanguage) {
          state.selectedLanguage = action.payload.currentSystemLocale;
        }
      })
      .addCase(loadAvailableLanguages.rejected, (state, action) => {
        state.languagesLoading = false;
        state.languageError = action.error.message || '加载语言列表失败';
      })
      // 更新系统语言
      .addCase(updateSystemLanguage.pending, (state) => {
        state.savingLanguage = true;
        state.languageError = null;
      })
      .addCase(updateSystemLanguage.fulfilled, (state, action) => {
        state.savingLanguage = false;
        state.currentLocale = action.payload;
      })
      .addCase(updateSystemLanguage.rejected, (state, action) => {
        state.savingLanguage = false;
        state.languageError = action.error.message || '修改语言失败';
      });
  },
});

export const {
  setCurrentLocale,
  clearError,
  setSelectedLanguage,
  clearLanguageError,
} = i18nSlice.actions;
export default i18nSlice.reducer;