import { defineStore } from 'pinia'
import request from '@/utils/request'

export interface MenuItem {
  id: string
  name: string
  path: string
  icon?: string
  parentId?: string
  sort: number
  children?: MenuItem[]
}

interface BackendMenuItem {
  id: string
  menuName: string
  parentId: string
  orderNum: number
  menuType: string
  perms?: string
  component?: string
  status: number
  children?: BackendMenuItem[]
}

function transformMenuData(backendMenus: BackendMenuItem[]): MenuItem[] {
  const menuMap = new Map<string, MenuItem>()
  const rootMenus: MenuItem[] = []
  
  const componentToPathMap: Record<string, string> = {
    'system/user/index': '/users',
    'system/role/index': '/roles',
    'system/menu/index': '/menus',
    'system/dict/index': '/dict',
    'system/config/index': '/sys/config',
    'system/notice/index': '/notice',
    'system/file/index': '/files',
    'audit/operation/index': '/oplog',
    'audit/login/index': '/loginlog',
    'audit/exception/index': '/exceptionlog',
  }
  
  const filteredMenus = backendMenus.filter(menu => menu.menuType !== 'F')
  
  filteredMenus.forEach(menu => {
    const menuItem: MenuItem = {
      id: menu.id,
      name: menu.menuName,
      path: menu.component ? (componentToPathMap[menu.component] || `/${menu.component.replace('/index', '').replace('system/', '')}`) : '',
      icon: getMenuIcon(menu.menuName),
      parentId: menu.parentId === '0' ? undefined : menu.parentId,
      sort: menu.orderNum
    }
    menuMap.set(menu.id, menuItem)
  })
  
  filteredMenus.forEach(menu => {
    const menuItem = menuMap.get(menu.id)!
    if (menu.parentId === '0') {
      rootMenus.push(menuItem)
    } else {
      const parentMenu = menuMap.get(menu.parentId)
      if (parentMenu) {
        if (!parentMenu.children) {
          parentMenu.children = []
        }
        parentMenu.children.push(menuItem)
      }
    }
  })
  
  rootMenus.forEach(menu => {
    if (menu.children) {
      menu.children.sort((a, b) => a.sort - b.sort)
    }
  })
  
  return rootMenus.sort((a, b) => a.sort - b.sort)
}

function getMenuIcon(menuName: string): string {
  const iconMap: Record<string, string> = {
    '系统管理': 'Setting',
    '审计日志': 'Document',
    '系统监控': 'Monitor',
    '用户管理': 'User',
    '角色管理': 'UserFilled',
    '菜单管理': 'Menu',
    '字典管理': 'Collection',
    '参数配置': 'Tools',
    '通知公告': 'Bell',
    '文件管理': 'Folder',
    '操作日志': 'Document',
    '登录日志': 'Document',
    '异常日志': 'Warning'
  }
  return iconMap[menuName] || 'Document'
}

interface PermissionState {
  roles: string[]
  permissions: string[]
  menus: MenuItem[]
  loaded: boolean
}

export const usePermissionStore = defineStore('permission', {
  state: (): PermissionState => ({
    roles: [],
    permissions: [],
    menus: [],
    loaded: false
  }),

  getters: {
    hasRole: (state) => (role: string | string[]) => {
      if (Array.isArray(role)) {
        return role.some(r => state.roles.includes(r))
      }
      return state.roles.includes(role)
    },

    hasPermission: (state) => (permission: string | string[]) => {
      if (Array.isArray(permission)) {
        return permission.some(p => state.permissions.includes(p))
      }
      return state.permissions.includes(permission)
    }
  },

  actions: {
    setPermissionData(data: {
      roles: string[]
      permissions: string[]
      menus: MenuItem[]
    }) {
      this.roles = data.roles
      this.permissions = data.permissions
      this.menus = data.menus
      this.loaded = true
      
      this.saveToStorage()
    },

    clearPermissionData() {
      this.roles = []
      this.permissions = []
      this.menus = []
      this.loaded = false
      
      localStorage.removeItem('permission')
    },

    saveToStorage() {
      const data = {
        roles: this.roles,
        permissions: this.permissions,
        menus: this.menus
      }
      localStorage.setItem('permission', JSON.stringify(data))
    },

    initFromStorage() {
      const stored = localStorage.getItem('permission')
      if (stored) {
        try {
          const data = JSON.parse(stored)
          this.roles = data.roles || []
          this.permissions = data.permissions || []
          this.menus = data.menus || []
          this.loaded = true
        } catch (error) {
          console.error('从 localStorage 恢复权限数据失败:', error)
        }
      }
    },

    async fetchUserMenus() {
      try {
        const res: any = await request.get('/menus')
        
        if (res && Array.isArray(res)) {
          const transformedMenus = transformMenuData(res)
          
          const permissions: string[] = []
          const extractPermissions = (menus: BackendMenuItem[]) => {
            menus.forEach(menu => {
              if (menu.perms) {
                permissions.push(menu.perms)
              }
              if (menu.children && menu.children.length > 0) {
                extractPermissions(menu.children)
              }
            })
          }
          extractPermissions(res)
          
          this.setPermissionData({
            roles: JSON.parse(localStorage.getItem('roles') || '[]'),
            permissions: permissions,
            menus: transformedMenus
          })
        }
      } catch (error) {
        console.error('获取用户菜单失败:', error)
        throw error
      }
    }
  }
})