'use client'

import { useEffect, useState } from 'react'
import { User, LogOut, KeyRound } from 'lucide-react'
import { DevPanel } from '@/app/(main)/dev/panel'
import { ChangePasswordDialog } from '@/components/layout/change-password-dialog'
import { UserProfileDialog } from '@/components/layout/user-profile-dialog'
import { Button } from '@/components/ui/button'
import {
  DropdownMenu,
  DropdownMenuContent,
  DropdownMenuItem,
  DropdownMenuLabel,
  DropdownMenuSeparator,
  DropdownMenuTrigger,
} from '@/components/ui/dropdown-menu'
import { Separator } from '@/components/ui/separator'
import { SidebarTrigger } from '@/components/ui/sidebar'
import { signOut } from 'next-auth/react'
import { useRouter, usePathname } from 'next/navigation'
import { useTheme } from 'next-themes'
import { ThemeToggleButton, useThemeTransition } from '@/components/common/theme-toggle-button'
import { getMenuTitle } from '@/constants/menu'
import type { User as AppUser } from '@/types/user'
import { useUserStore } from '@/lib/stores/userStore'
import { toast } from 'sonner'
import { trpc } from '@/lib/trpc'
import { AdvancedSelect, SelectContent, SelectedName, SelectInput, SelectItemList, SelectPopover, SelectTrigger } from '@/components/common/advanced-select'
import type { Dept } from '@prisma/client'

interface HeaderProps {
  user?: AppUser
}

export function Header({ user }: HeaderProps) {
  const router = useRouter()
  const pathname = usePathname()
  const { theme, setTheme } = useTheme()
  const { startTransition } = useThemeTransition()
  const [isChangePasswordOpen, setIsChangePasswordOpen] = useState(false)
  const [isUserProfileOpen, setIsUserProfileOpen] = useState(false)

  const pageTitle = getMenuTitle(pathname, 2) // 只匹配到第二级菜单

  // 从zustand store获取当前管理的院系信息
  const { setCurrentManagedDept } = useUserStore()

  // 获取可管理的院系列表（包含当前管理的院系信息）
  const { data: managedDeptsData } = trpc.users.getManagedDepts.useQuery()
  
  // 本地状态管理
  const [currentManagedDeptCode, setCurrentManagedDeptCode] = useState<string | null>(null)
  const [managedDepts, setManagedDepts] = useState<Array<Dept>>([])
  
  // 初始化数据
  useEffect(() => {
    if (managedDeptsData && managedDeptsData.currentDept !== undefined) {
      setCurrentManagedDeptCode(managedDeptsData.currentDept)
      setManagedDepts(managedDeptsData.depts)
      
      // 更新store中的当前管理院系信息
      const deptInfo = managedDeptsData.depts.find(dept => dept.code === managedDeptsData.currentDept) || null
      setCurrentManagedDept(deptInfo)
    }
  }, [managedDeptsData, setCurrentManagedDept])
  
  // 切换管理院系
  const switchManagedDeptMutation = trpc.users.switchManagedDept.useMutation({
    onSuccess: (data) => {
      toast.success('切换管理院系成功')
      // 更新本地状态
      setCurrentManagedDeptCode(data.deptCode)
      // 更新store中的当前管理院系信息 
      setCurrentManagedDept(managedDepts.find(dept => dept.code === data.deptCode) || null)
    },
    onError: (error) => {
      toast.error(error.message || '切换管理院系失败')
    },
  })
  
  // 处理院系切换
  const handleDeptChange = (deptCode: string | null) => {
    switchManagedDeptMutation.mutate({ deptCode })
  }

  const handleThemeToggle = () => {
    startTransition(() => {
      setTheme(theme === 'dark' ? 'light' : 'dark')
    })
  }

  const handleLogout = async () => {
    await signOut({ redirect: false })
    router.push('/login')
  }

  // 如果没有用户信息，不显示Header（应该被中间件重定向）
  if (!user) {
    return null
  }

  return (
    <header className="flex h-16 shrink-0 items-center gap-2 border-b px-4">
      <SidebarTrigger />
      <Separator orientation="vertical" className="mr-2 h-4" />
      <div className="flex items-center justify-between flex-1">
        <h2 className="text-lg font-semibold">
          {pageTitle}
        </h2>
        <div className="flex items-center space-x-4">
          {/* 主题切换按钮 */}
          <ThemeToggleButton
            theme={theme === 'dark' ? 'dark' : 'light'}
            variant="polygon"
            onClick={handleThemeToggle}
            className="border-0 shadow-none"
          />

          {/* 开发者工具按钮 - 仅开发环境 */}
          {process.env.NODE_ENV === 'development' && user.isSuperAdmin && <DevPanel />}

          {/* 用户菜单 */}
          <DropdownMenu>
            <DropdownMenuTrigger asChild>
              <Button variant="ghost" className="flex items-center space-x-2 px-3">
                <div className="w-8 h-8 bg-primary/10 rounded-full flex items-center justify-center">
                  <User className="h-4 w-4 text-primary" />
                </div>
                <div className="text-left hidden sm:block">
                  <p className="text-sm font-medium">{user.name}</p>
                  <p className="text-xs text-muted-foreground">
                    {user.isSuperAdmin ? '超级管理员' : (Array.isArray(user.roles) ? user.roles.join('、') : user.roles)}
                  </p>
                </div>
              </Button>
            </DropdownMenuTrigger>
            <DropdownMenuContent align="end" className="w-56">
              <DropdownMenuLabel>我的账户</DropdownMenuLabel>
              <DropdownMenuSeparator />
              <DropdownMenuItem onClick={() => setIsUserProfileOpen(true)}>
                <User className="mr-2 h-4 w-4" />
                个人资料
              </DropdownMenuItem>
              <DropdownMenuItem onClick={() => setIsChangePasswordOpen(true)}>
                <KeyRound className="mr-2 h-4 w-4" />
                修改密码
              </DropdownMenuItem>
              <DropdownMenuSeparator />
              <DropdownMenuLabel>角色</DropdownMenuLabel>
              <DropdownMenuItem disabled>
                {user.isSuperAdmin ? '超级管理员' : (Array.isArray(user.roles) ? user.roles.join('、') : user.roles)}
              </DropdownMenuItem>
              {/* 管理院系 - 根据可管理院系数量决定显示方式 */}
              {managedDepts.length > 0 && (
                <>
                  <DropdownMenuSeparator />
                  <DropdownMenuLabel>管理院系</DropdownMenuLabel>
                  {managedDepts.length === 1 ? (
                    // 只有一个可管理院系时，直接显示院系名称
                    <DropdownMenuItem disabled>
                      {managedDepts[0].fullName}
                    </DropdownMenuItem>
                  ) : (
                    // 多个可管理院系时，显示下拉选择器
                    <div className="px-2 py-1.5">
                      <AdvancedSelect
                        value={currentManagedDeptCode}
                        onChange={handleDeptChange}
                        options={managedDepts.map(dept => ({
                          id: dept.code,
                          name: dept.fullName,
                          shortName: dept.name
                        }))}
                        disabled={switchManagedDeptMutation.isPending}
                        filterFunction={(option, searchValue) => {
                          const search = searchValue.toLowerCase()
                          return option.id.includes(search) ||
                                 option.name.toLowerCase().includes(search) ||
                                 (option.shortName && option.shortName.toLowerCase().includes(search))
                        }}
                      >
                        <SelectPopover>
                          <SelectTrigger
                            placeholder="请选择管理院系"
                            className="h-9"
                          >
                            <SelectedName />
                          </SelectTrigger>
                          <SelectContent>
                            {managedDepts.length > 5 && <SelectInput placeholder="搜索院系名称/代码" />}
                            <SelectItemList />
                          </SelectContent>
                        </SelectPopover>
                      </AdvancedSelect>
                    </div>
                  )}
                </>
              )}
              <DropdownMenuSeparator />
              <DropdownMenuItem
                className="text-red-600 cursor-pointer"
                onClick={handleLogout}
              >
                <LogOut className="mr-2 h-4 w-4" />
                退出登录
              </DropdownMenuItem>
            </DropdownMenuContent>
          </DropdownMenu>
        </div>
      </div>

      {/* 修改密码对话框 */}
      <ChangePasswordDialog
        isOpen={isChangePasswordOpen}
        onClose={() => setIsChangePasswordOpen(false)}
      />

      {/* 用户资料对话框 */}
      <UserProfileDialog
        isOpen={isUserProfileOpen}
        onClose={() => setIsUserProfileOpen(false)}
      />
    </header>
  )
}