/**
 * 全局状态管理器
 * 提供应用级数据管理和状态同步
 */

class Store {
  constructor() {
    this.state = {
      userInfo: null,
      isLogin: false,
      favoriteCourses: [],
      gpaCourses: [],
      schedule: {},
      countdowns: [],
      settings: {
        theme: 'light',
        notifications: true,
        language: 'zh-CN'
      }
    }
    this.listeners = []
    this.init()
  }

  /**
   * 初始化：从本地存储恢复状态
   */
  init() {
    try {
      const savedState = wx.getStorageSync('appState')
      if (savedState) {
        this.state = { ...this.state, ...savedState }
      }
    } catch (e) {
      console.error('状态初始化失败:', e)
    }
  }

  /**
   * 获取状态
   */
  getState(key) {
    if (key) {
      return this.state[key]
    }
    return this.state
  }

  /**
   * 设置状态
   */
  setState(key, value) {
    if (typeof key === 'object') {
      // 批量更新
      this.state = { ...this.state, ...key }
    } else {
      this.state[key] = value
    }
    
    this.notify()
    this.persist()
  }

  /**
   * 订阅状态变化
   */
  subscribe(listener) {
    this.listeners.push(listener)
    return () => {
      const index = this.listeners.indexOf(listener)
      if (index > -1) {
        this.listeners.splice(index, 1)
      }
    }
  }

  /**
   * 通知所有订阅者
   */
  notify() {
    this.listeners.forEach(listener => {
      try {
        listener(this.state)
      } catch (e) {
        console.error('状态通知失败:', e)
      }
    })
  }

  /**
   * 持久化到本地存储
   */
  persist() {
    try {
      wx.setStorageSync('appState', this.state)
    } catch (e) {
      console.error('状态持久化失败:', e)
    }
  }

  /**
   * 清空状态
   */
  clear() {
    this.state = {
      userInfo: null,
      isLogin: false,
      favoriteCourses: [],
      gpaCourses: [],
      schedule: {},
      countdowns: [],
      settings: {
        theme: 'light',
        notifications: true,
        language: 'zh-CN'
      }
    }
    this.persist()
    this.notify()
  }
}

// 创建全局实例
const store = new Store()

module.exports = {
  store
}