import { create } from "zustand";
import { api, SearchResult, PlayRecord } from "@/services/api";
import { PlayRecordManager } from "@/services/storage";
import useAuthStore from "./authStore";
import { useSettingsStore } from "./settingsStore";

export type RowItem = (SearchResult | PlayRecord) & {
  id: string;
  source: string;
  title: string;
  poster: string;
  progress?: number;
  play_time?: number;
  lastPlayed?: number;
  episodeIndex?: number;
  sourceName?: string;
  totalEpisodes?: number;
  year?: string;
  rate?: string;
};

export interface Category {
  title: string;
  type?: "movie" | "tv" | "record";
  tag?: string;
  tags?: string[];
}

const initialCategories: Category[] = [
  { title: "最近播放", type: "record" },
  { title: "热门剧集", type: "tv", tag: "热门" },
  { title: "电视剧", type: "tv", tags: ["国产剧", "美剧", "英剧", "韩剧", "日剧", "港剧", "日本动画", "动画"] },
  {
    title: "电影",
    type: "movie",
    tags: [
      "热门",
      "最新",
      "经典",
      "豆瓣高分",
      "冷门佳片",
      "华语",
      "欧美",
      "韩国",
      "日本",
      "动作",
      "喜剧",
      "爱情",
      "科幻",
      "悬疑",
      "恐怖",
    ],
  },
  { title: "综艺", type: "tv", tag: "综艺" },
  { title: "豆瓣 Top250", type: "movie", tag: "top250" },
];

interface HomeState {
  categories: Category[];
  selectedCategory: Category;
  contentData: RowItem[];
  loading: boolean;
  loadingMore: boolean;
  pageStart: number;
  hasMore: boolean;
  error: string | null;
  fetchInitialData: () => Promise<void>;
  loadMoreData: () => Promise<void>;
  selectCategory: (category: Category) => void;
  refreshPlayRecords: () => Promise<void>;
  clearError: () => void;
}

// 内存缓存，应用生命周期内有效
const dataCache = new Map<string, RowItem[]>();

const useHomeStore = create<HomeState>((set, get) => ({
  categories: initialCategories,
  selectedCategory: initialCategories[0],
  contentData: [],
  loading: true,
  loadingMore: false,
  pageStart: 0,
  hasMore: true,
  error: null,

  fetchInitialData: async () => {
    const { apiBaseUrl } = useSettingsStore.getState();
    await useAuthStore.getState().checkLoginStatus(apiBaseUrl);
    
    const { selectedCategory } = get();
    const cacheKey = `${selectedCategory.title}-${selectedCategory.tag || ''}`;
    
    // 最近播放不缓存，始终实时获取
    if (selectedCategory.type === 'record') {
      set({ loading: true, contentData: [], pageStart: 0, hasMore: true, error: null });
      await get().loadMoreData();
      return;
    }
    
    // 检查缓存
    if (dataCache.has(cacheKey)) {
      set({ 
        loading: false, 
        contentData: dataCache.get(cacheKey)!, 
        pageStart: dataCache.get(cacheKey)!.length, 
        hasMore: false, 
        error: null 
      });
      return;
    }
    
    set({ loading: true, contentData: [], pageStart: 0, hasMore: true, error: null });
    await get().loadMoreData();
  },

  loadMoreData: async () => {
    const { selectedCategory, pageStart, loadingMore, hasMore } = get();
    if (loadingMore || !hasMore) return;

    if (pageStart > 0) {
      set({ loadingMore: true });
    }

    try {
      if (selectedCategory.type === "record") {
        const { isLoggedIn } = useAuthStore.getState();
        if (!isLoggedIn) {
          set({ contentData: [], hasMore: false });
          return;
        }
        const records = await PlayRecordManager.getAll();
        const rowItems = Object.entries(records)
          .map(([key, record]) => {
            const [source, id] = key.split("+");
            return {
              ...record,
              id,
              source,
              progress: record.play_time / record.total_time,
              poster: record.cover,
              sourceName: record.source_name,
              episodeIndex: record.index,
              totalEpisodes: record.total_episodes,
              lastPlayed: record.save_time,
              play_time: record.play_time,
            };
          })
          // .filter((record) => record.progress !== undefined && record.progress > 0 && record.progress < 1)
          .sort((a, b) => (b.lastPlayed || 0) - (a.lastPlayed || 0));

        set({ contentData: rowItems, hasMore: false });
      } else if (selectedCategory.type && selectedCategory.tag) {
        const result = await api.getDoubanData(selectedCategory.type, selectedCategory.tag, 20, pageStart);
        if (result.list.length === 0) {
          set({ hasMore: false });
        } else {
          const newItems = result.list.map((item) => ({
            ...item,
            id: item.title,
            source: "douban",
          })) as RowItem[];
          
          const cacheKey = `${selectedCategory.title}-${selectedCategory.tag || ''}`;
          
          if (pageStart === 0) {
            // 缓存新数据
            dataCache.set(cacheKey, newItems);
            set((state) => ({
              contentData: newItems,
              pageStart: result.list.length,
              hasMore: true,
            }));
          } else {
            // 增量加载时不缓存，直接追加
            set((state) => ({
              contentData: [...state.contentData, ...newItems],
              pageStart: state.pageStart + result.list.length,
              hasMore: true,
            }));
          }
        }
      } else if (selectedCategory.tags) {
        // It's a container category, do not load content, but clear current content
        set({ contentData: [], hasMore: false });
      } else {
        set({ hasMore: false });
      }
    } catch (err: any) {
      if (err.message === "API_URL_NOT_SET") {
        set({ error: "请点击右上角设置按钮，配置您的服务器地址" });
      } else {
        set({ error: "加载失败，请重试" });
      }
    } finally {
      set({ loading: false, loadingMore: false });
    }
  },

  selectCategory: (category: Category) => {
    const currentCategory = get().selectedCategory;
    const cacheKey = `${category.title}-${category.tag || ''}`;
    
    // 只有当分类或标签真正变化时才处理
    if (currentCategory.title !== category.title || currentCategory.tag !== category.tag) {
      set({ selectedCategory: category, contentData: [], pageStart: 0, hasMore: true, error: null });
      
      // 最近播放始终实时获取
      if (category.type === 'record') {
        get().fetchInitialData();
        return;
      }
      
      // 检查缓存，有则直接使用，无则请求
      if (dataCache.has(cacheKey)) {
        set({ 
          contentData: dataCache.get(cacheKey)!, 
          pageStart: dataCache.get(cacheKey)!.length, 
          hasMore: false, 
          loading: false 
        });
      } else {
        get().fetchInitialData();
      }
    }
  },

  refreshPlayRecords: async () => {
    const { apiBaseUrl } = useSettingsStore.getState();
    await useAuthStore.getState().checkLoginStatus(apiBaseUrl);
    const { isLoggedIn } = useAuthStore.getState();
    if (!isLoggedIn) {
      set((state) => {
        const recordCategoryExists = state.categories.some((c) => c.type === "record");
        if (recordCategoryExists) {
          const newCategories = state.categories.filter((c) => c.type !== "record");
          if (state.selectedCategory.type === "record") {
            get().selectCategory(newCategories[0] || null);
          }
          return { categories: newCategories };
        }
        return {};
      });
      return;
    }
    const records = await PlayRecordManager.getAll();
    const hasRecords = Object.keys(records).length > 0;
    set((state) => {
      const recordCategoryExists = state.categories.some((c) => c.type === "record");
      if (hasRecords && !recordCategoryExists) {
        return { categories: [initialCategories[0], ...state.categories] };
      }
      if (!hasRecords && recordCategoryExists) {
        const newCategories = state.categories.filter((c) => c.type !== "record");
        if (state.selectedCategory.type === "record") {
          get().selectCategory(newCategories[0] || null);
        }
        return { categories: newCategories };
      }
      return {};
    });
    
    get().fetchInitialData();
  },
  
  clearError: () => {
    set({ error: null });
  },
}));

export default useHomeStore;