import { create } from 'zustand';
import { persist } from 'zustand/middleware';
import * as authService from '../services/auth';
import * as userProfileService from '../services/userProfile';
import * as lifeEventService from '../services/lifeEvent';
import * as epicScriptService from '../services/epicScript';
import * as lifePathService from '../services/lifePath';

/**
 * 默认注册数据
 */
const defaultRegistrationData = {
  id: null,
  nickname: '',
  gender: '',
  zodiac: '',
  mbti: '',
  profession: '',
  hobbies: [],
  childhood: { date: '', text: '' },
  joy: { date: '', text: '' },
  low: { date: '', text: '' },
  future: { vision: '', ideal: '' }
};

/**
 * 应用状态存储
 * 使用 Zustand 进行状态管理，支持 localStorage 持久化
 */
const useStore = create(
  persist(
    (set, get) => ({
      // 认证状态
      isLoggedIn: false,
      phone: '',
      userId: null,
      
      // 视图状态
      view: 'login',
      currentStep: 1,
      
      // 用户注册数据
      registrationData: { ...defaultRegistrationData },
      
      // 生命事件
      lifeEvents: [],
      
      // 剧本
      scripts: [],
      selectedScriptId: null,
      
      // 路径
      selectedPath: null,

      // 加载状态
      loading: false,
      error: null,

      /**
       * 设置加载状态
       */
      setLoading: (loading) => set({ loading }),

      /**
       * 设置错误信息
       */
      setError: (error) => set({ error }),

      /**
       * 获取短信验证码
       * @param {string} phone - 手机号
       */
      getSmsCode: async (phone) => {
        set({ loading: true, error: null });
        try {
          const response = await authService.getSmsCode(phone);
          set({ loading: false });
          return response;
        } catch (error) {
          set({ loading: false, error: error.message });
          throw error;
        }
      },

      /**
       * 登录
       * @param {string} phone - 手机号
       * @param {string} smsCode - 验证码
       * @returns {Promise<Object>} 包含 hasProfile 标识，用于判断是否需要跳转到 onboarding
       */
      login: async (phone, smsCode) => {
        set({ loading: true, error: null });
        try {
          const response = await authService.login({ phone, smsCode });
          const { userId } = response.data || {};
          
          set({ 
            isLoggedIn: true, 
            phone,
            userId,
            loading: false 
          });
          
          // 尝试加载用户档案，判断用户是否已完成注册
          let hasProfile = false;
          try {
            const profileData = await get().loadUserProfile();
            // 检查档案是否完整（有昵称和未来愿景）
            hasProfile = !!(profileData && profileData.nickname && profileData.future?.vision);
          } catch {
            // 档案不存在，需要进入入站流程
            hasProfile = false;
          }
          
          // 根据档案状态设置视图
          set({ view: hasProfile ? 'dashboard' : 'onboarding' });
          
          return { ...response, hasProfile };
        } catch (error) {
          set({ loading: false, error: error.message });
          throw error;
        }
      },

      /**
       * 设置登录状态（本地模式）
       */
      setLogin: (isLoggedIn, phone = '') => set({ 
        isLoggedIn, 
        phone,
        view: isLoggedIn ? 'onboarding' : 'login'
      }),

      /**
       * 登出
       */
      logout: async () => {
        try {
          await authService.logout();
        } catch {
          // 忽略登出错误
        }
        set({
          isLoggedIn: false,
          phone: '',
          userId: null,
          view: 'login',
          currentStep: 1,
          registrationData: { ...defaultRegistrationData },
          lifeEvents: [],
          scripts: [],
          selectedScriptId: null,
          selectedPath: null
        });
      },

      /**
       * 设置当前视图
       */
      setView: (view) => set({ view }),

      /**
       * 设置当前步骤
       */
      setCurrentStep: (step) => set({ currentStep: step }),

      /**
       * 加载用户档案
       */
      loadUserProfile: async () => {
        set({ loading: true });
        try {
          const response = await userProfileService.getCurrentProfile();
          if (response.data) {
            const profileData = userProfileService.transformToFrontendFormat(response.data);
            set({ 
              registrationData: { ...defaultRegistrationData, ...profileData },
              loading: false 
            });
            return profileData;
          }
          set({ loading: false });
          return null;
        } catch (error) {
          set({ loading: false });
          throw error;
        }
      },

      /**
       * 更新注册数据（本地）
       */
      updateRegistration: (data) => set((state) => ({
        registrationData: { ...state.registrationData, ...data }
      })),

      /**
       * 保存用户档案到后端
       */
      saveUserProfile: async () => {
        const { registrationData } = get();
        set({ loading: true, error: null });
        try {
          let response;
          if (registrationData.id) {
            // 更新
            response = await userProfileService.updateProfile(registrationData);
          } else {
            // 创建
            response = await userProfileService.createProfile(registrationData);
          }
          
          if (response.data) {
            const profileData = userProfileService.transformToFrontendFormat(response.data);
            set({ 
              registrationData: { ...registrationData, ...profileData },
              loading: false 
            });
          } else {
            set({ loading: false });
          }
          return response;
        } catch (error) {
          set({ loading: false, error: error.message });
          throw error;
        }
      },

      /**
       * 加载生命事件列表
       */
      loadLifeEvents: async () => {
        set({ loading: true });
        try {
          const response = await lifeEventService.getEventList();
          const events = lifeEventService.transformListToFrontend(response.data || []);
          set({ lifeEvents: events, loading: false });
          return events;
        } catch (error) {
          set({ loading: false });
          throw error;
        }
      },

      /**
       * 添加生命事件
       */
      addLifeEvent: async (event) => {
        set({ loading: true, error: null });
        try {
          const response = await lifeEventService.createEvent(event);
          if (response.data) {
            const newEvent = lifeEventService.transformToFrontendFormat(response.data);
            set((state) => ({
              lifeEvents: [...state.lifeEvents, newEvent],
              loading: false
            }));
            return newEvent;
          }
          set({ loading: false });
          return null;
        } catch (error) {
          set({ loading: false, error: error.message });
          // 降级到本地存储
          const localEvent = { ...event, id: Date.now().toString() };
          set((state) => ({
            lifeEvents: [...state.lifeEvents, localEvent]
          }));
          return localEvent;
        }
      },

      /**
       * 删除生命事件
       */
      deleteLifeEvent: async (id) => {
        set({ loading: true });
        try {
          await lifeEventService.deleteEvent(id);
          set((state) => ({
            lifeEvents: state.lifeEvents.filter(e => e.id !== id),
            loading: false
          }));
        } catch (error) {
          set({ loading: false });
          // 降级到本地删除
          set((state) => ({
            lifeEvents: state.lifeEvents.filter(e => e.id !== id)
          }));
        }
      },

      /**
       * 加载剧本列表
       */
      loadScripts: async () => {
        set({ loading: true });
        try {
          const response = await epicScriptService.getScriptList();
          const scripts = epicScriptService.transformListToFrontend(response.data || []);
          // 找到选中的剧本
          const selectedScript = scripts.find(s => s.isSelected);
          set({ 
            scripts, 
            selectedScriptId: selectedScript?.id || scripts[0]?.id || null,
            loading: false 
          });
          return scripts;
        } catch (error) {
          set({ loading: false });
          throw error;
        }
      },

      /**
       * 添加剧本
       */
      addScript: async (script) => {
        set({ loading: true, error: null });
        try {
          const response = await epicScriptService.createScript({
            ...script,
            isSelected: true
          });
          if (response.data) {
            const newScript = epicScriptService.transformToFrontendFormat(response.data);
            set((state) => ({
              scripts: [newScript, ...state.scripts],
              selectedScriptId: newScript.id,
              loading: false
            }));
            return newScript;
          }
          set({ loading: false });
          return null;
        } catch (error) {
          set({ loading: false, error: error.message });
          // 降级到本地存储
          const localScript = {
            ...script,
            id: Date.now().toString(),
            date: new Date().toLocaleDateString()
          };
          set((state) => ({
            scripts: [localScript, ...state.scripts],
            selectedScriptId: localScript.id
          }));
          return localScript;
        }
      },

      /**
       * 设置选中的剧本ID
       */
      setSelectedScriptId: async (id) => {
        set({ selectedScriptId: id });
        try {
          await epicScriptService.selectScript(id);
        } catch {
          // 忽略错误，本地已更新
        }
      },

      /**
       * 获取选中的剧本
       */
      getSelectedScript: () => {
        const state = get();
        return state.scripts.find(s => s.id === state.selectedScriptId);
      },

      /**
       * 删除剧本
       */
      deleteScript: async (id) => {
        set({ loading: true });
        try {
          await epicScriptService.deleteScript(id);
          set((state) => {
            const newScripts = state.scripts.filter(s => s.id !== id);
            return {
              scripts: newScripts,
              selectedScriptId: state.selectedScriptId === id 
                ? (newScripts[0]?.id || null) 
                : state.selectedScriptId,
              loading: false
            };
          });
        } catch (error) {
          set({ loading: false });
          // 降级到本地删除
          set((state) => {
            const newScripts = state.scripts.filter(s => s.id !== id);
            return {
              scripts: newScripts,
              selectedScriptId: state.selectedScriptId === id 
                ? (newScripts[0]?.id || null) 
                : state.selectedScriptId
            };
          });
        }
      },

      /**
       * 加载路径
       */
      loadPath: async (scriptId) => {
        if (!scriptId) return null;
        set({ loading: true });
        try {
          const response = await lifePathService.getPathByScriptId(scriptId);
          if (response.data) {
            const path = lifePathService.transformToFrontendFormat(response.data);
            set({ selectedPath: path.content, loading: false });
            return path;
          }
          set({ loading: false });
          return null;
        } catch {
          set({ loading: false });
          return null;
        }
      },

      /**
       * 设置路径
       */
      setPath: async (pathContent, scriptId) => {
        set({ selectedPath: pathContent });
        
        if (scriptId) {
          try {
            // 检查是否已有路径
            const existingPath = await lifePathService.getPathByScriptId(scriptId).catch(() => null);
            
            if (existingPath?.data?.id) {
              // 更新
              await lifePathService.updatePath({
                id: existingPath.data.id,
                scriptId,
                content: pathContent
              });
            } else {
              // 创建
              await lifePathService.createPath({
                scriptId,
                content: pathContent
              });
            }
          } catch {
            // 忽略错误，本地已更新
          }
        }
      },

      /**
       * 清除所有数据
       */
      clear: async () => {
        try {
          await authService.logout();
        } catch {
          // 忽略错误
        }
        localStorage.removeItem('life_trajectory_v3');
        localStorage.removeItem('access_token');
        localStorage.removeItem('refresh_token');
        set({
          isLoggedIn: false,
          phone: '',
          userId: null,
          view: 'login',
          currentStep: 1,
          registrationData: { ...defaultRegistrationData },
          lifeEvents: [],
          scripts: [],
          selectedScriptId: null,
          selectedPath: null,
          loading: false,
          error: null
        });
        window.location.reload();
      }
    }),
    {
      name: 'life_trajectory_v3',
      onRehydrateStorage: () => (state, error) => {
        if (error) {
          console.error('Failed to load state from localStorage:', error);
        }
      }
    }
  )
);

export default useStore;