'use client'
import { useState, useEffect } from 'react'
import Link from 'next/link'
import { usePathname } from 'next/navigation'
import { LayoutDashboard, FileText, Settings, Users, Shield, Key, Clock, CheckCircle, PlusSquare, Upload, List, Mail } from 'lucide-react'

const navItems = [
  { href: '/dashboard', label: '仪表盘', icon: LayoutDashboard, perm: null },
  { href: '/tickets/pending', label: '待办工单', icon: Clock, perm: 'tickets:read' },
  { href: '/tickets/completed', label: '已办工单', icon: CheckCircle, perm: 'tickets:read' },
  { href: '/tickets/create', label: '手动建单', icon: PlusSquare, perm: 'tickets:create' },
  { href: '/tickets/import', label: '导入工单', icon: Upload, perm: 'tickets:import' },
  { href: '/reports', label: '报告管理', icon: FileText, perm: 'reports:read' },
]

const settingsItems = [
  { href: '/settings/users', label: '用户管理', icon: Users, perm: 'users:read' },
  { href: '/settings/roles', label: '角色权限', icon: Shield, perm: 'roles:read' },
  { href: '/settings/api-keys', label: 'API Key', icon: Key, perm: 'api-keys:read' },
  { href: '/settings/audit-logs', label: '审计日志', icon: FileText, perm: 'audit-logs:read' },
  { href: '/settings/monitor', label: '邮件监控', icon: Mail, perm: 'monitor:read' },
]

function hasAnyAdminPerm(permissions: string[]): boolean {
  return permissions.includes('*') || permissions.some(p => p.startsWith('users:') || p.startsWith('roles:') || p.startsWith('api-keys:'))
}

export default function Sidebar() {
  const pathname = usePathname()
  const [permissions, setPermissions] = useState<string[]>([])

  useEffect(() => {
    fetch('/api/auth/me')
      .then(r => r.json())
      .then(u => { if (u.user?.permissions) setPermissions(u.user.permissions) })
      .catch(() => {})
  }, [])

  const canSee = (perm: string | null) => {
    if (perm === null) return true
    if (permissions.includes('*')) return true
    return permissions.includes(perm)
  }

  return (
    <aside className="fixed left-0 top-0 bottom-0 w-60 bg-white dark:bg-slate-900 border-r border-slate-200 dark:border-slate-800 flex flex-col z-40">
      <div className="h-14 flex items-center px-5 border-b border-slate-200 dark:border-slate-800">
        <span className="text-lg font-semibold text-blue-600 dark:text-blue-400">IT工单跟踪系统</span>
      </div>
      <nav className="flex-1 py-3 px-3 space-y-1 overflow-y-auto">
        {navItems.filter(item => canSee(item.perm)).map((item) => {
          const isActive = pathname === item.href || pathname.startsWith(item.href + '/')
          const Icon = item.icon
          return (<Link key={item.href} href={item.href} className={`flex items-center gap-3 px-3 py-2.5 rounded-lg text-sm font-medium transition-all duration-200 ${isActive ? 'bg-blue-50 text-blue-700 dark:bg-blue-500/10 dark:text-blue-400' : 'text-slate-600 hover:bg-slate-50 dark:text-slate-400 dark:hover:bg-slate-800'}`}><Icon size={18} />{item.label}</Link>)
        })}
        {permissions.includes('*') && (
          <Link
            href="/tickets/all"
            className={`flex items-center gap-3 px-3 py-2.5 rounded-lg text-sm font-medium transition-all duration-200 ${pathname === '/tickets/all' ? 'bg-blue-50 text-blue-700 dark:bg-blue-500/10 dark:text-blue-400' : 'text-slate-600 hover:bg-slate-50 dark:text-slate-400 dark:hover:bg-slate-800'}`}
          >
            <List size={18} />全部工单
          </Link>
        )}
        {hasAnyAdminPerm(permissions) && (
        <div className="pt-3 border-t border-slate-200 dark:border-slate-800 mt-3">
          <div className="flex items-center gap-3 px-3 py-2 text-xs font-semibold text-slate-400 dark:text-slate-500 uppercase tracking-wider">
            <Settings size={14} />系统设置
          </div>
          {settingsItems.filter(item => canSee(item.perm)).map((item) => {
            const isActive = pathname === item.href
            const Icon = item.icon
            return (<Link key={item.href} href={item.href} className={`flex items-center gap-3 px-3 py-2.5 rounded-lg text-sm font-medium transition-all duration-200 ${isActive ? 'bg-blue-50 text-blue-700 dark:bg-blue-500/10 dark:text-blue-400' : 'text-slate-600 hover:bg-slate-50 dark:text-slate-400 dark:hover:bg-slate-800'}`}><Icon size={18} />{item.label}</Link>)
          })}
        </div>
        )}
      </nav>
    </aside>
  )
}