import { NavLink } from 'react-router-dom'
import {
  LayoutDashboard, Users, LogOut, Settings, FolderOpen,
  Shield, Menu as MenuIcon, Building2, User, ChevronDown,
  Cpu, Key, MessageSquare, BarChart3, Wallet,
} from 'lucide-react'
import type { LucideIcon } from 'lucide-react'
import { useAuth } from '@/contexts/AuthContext'
import { useState, useRef, useEffect } from 'react'
import type { MenuItem } from '@/types'

const iconMap: Record<string, LucideIcon> = {
  User, LayoutDashboard, Users, FolderOpen, Shield,
  Menu: MenuIcon, Building2, Settings,
  Cpu, Key, MessageSquare, BarChart3, Wallet,
}

function getIcon(iconName: string): LucideIcon {
  return iconMap[iconName] || LayoutDashboard
}

export function Sidebar() {
  const { user, logout, userMenus, currentOrg, userOrgs, switchOrg } = useAuth()
  const [orgDropdownOpen, setOrgDropdownOpen] = useState(false)
  const dropdownRef = useRef<HTMLDivElement>(null)

  useEffect(() => {
    function handleClickOutside(e: MouseEvent) {
      if (dropdownRef.current && !dropdownRef.current.contains(e.target as Node)) {
        setOrgDropdownOpen(false)
      }
    }
    document.addEventListener('mousedown', handleClickOutside)
    return () => document.removeEventListener('mousedown', handleClickOutside)
  }, [])

  const handleSwitchOrg = async (orgId: number) => {
    await switchOrg(orgId)
    setOrgDropdownOpen(false)
  }

  const menuItems: MenuItem[] = userMenus.length > 0 ? userMenus : []

  return (
    <aside className="w-64 h-screen bg-sidebar-bg backdrop-blur-xl border-r border-border flex flex-col fixed left-0 top-0 z-40">
      {/* Logo */}
      <div className="h-16 flex items-center px-6 border-b border-border shrink-0">
        <div className="flex items-center gap-3">
          <div className="w-9 h-9 rounded-lg bg-gradient-to-br from-sky-500 to-blue-600 flex items-center justify-center glow-primary">
            <span className="text-lg font-bold text-white font-display">B</span>
          </div>
          <div>
            <h1 className="text-lg font-bold text-foreground font-display leading-tight">BASE</h1>
            <p className="text-xs text-text-muted font-body">管理面板</p>
          </div>
        </div>
      </div>

      {/* Org Switcher */}
      {userOrgs.length > 0 && (
        <div className="px-4 pt-4" ref={dropdownRef}>
          <button
            onClick={() => setOrgDropdownOpen(!orgDropdownOpen)}
            className="w-full flex items-center justify-between px-3 py-2 rounded-lg bg-muted border border-border-secondary text-sm text-text-secondary hover:bg-surface-hover transition-colors"
          >
            <span className="truncate">{currentOrg?.name || '选择机构'}</span>
            <ChevronDown className={cn('h-4 w-4 transition-transform', orgDropdownOpen && 'rotate-180')} />
          </button>
          {orgDropdownOpen && (
            <div className="mt-1 py-1 rounded-lg bg-card border border-border-secondary shadow-xl">
              {userOrgs.map((org) => (
                <button
                  key={org.orgId}
                  onClick={() => handleSwitchOrg(org.orgId)}
                  className={cn(
                    'w-full text-left px-3 py-2 text-sm transition-colors',
                    currentOrg?.id === org.orgId
                      ? 'text-sky-400 bg-sky-500/10'
                      : 'text-text-secondary hover:text-foreground hover:bg-surface-hover'
                  )}
                >
                  <div className="truncate">{org.orgName}</div>
                  <div className="text-xs text-text-muted">{org.roleName}</div>
                </button>
              ))}
            </div>
          )}
        </div>
      )}

      {/* Navigation */}
      <nav className="flex-1 p-4 space-y-1 overflow-y-auto">
        {menuItems.map((item) => {
          const Icon = getIcon(item.icon)
          return (
            <NavLink
              key={item.path}
              to={item.path}
              className={({ isActive }) =>
                cn(
                  'flex items-center gap-3 px-4 py-3 rounded-lg transition-all duration-200',
                  'font-body text-sm font-medium',
                  isActive
                    ? 'bg-gradient-to-r from-sky-500/20 to-blue-600/20 text-sky-400 border border-sky-500/30'
                    : 'text-text-secondary hover:bg-surface-hover hover:text-foreground'
                )
              }
            >
              <Icon className="h-5 w-5" />
              {item.name}
            </NavLink>
          )
        })}
      </nav>

      {/* User Info */}
      <div className="h-14 flex items-center gap-3 px-5 border-t border-border shrink-0">
        <div className="w-8 h-8 rounded-lg bg-gradient-to-br from-amber-500 to-orange-600 flex items-center justify-center">
          <span className="text-sm font-bold text-foreground font-display">
            {user?.username?.[0]?.toUpperCase() || 'U'}
          </span>
        </div>
        <div className="flex-1 min-w-0">
          <p className="text-sm font-medium text-foreground font-body truncate">
            {user?.username || 'User'}
          </p>
          <p className="text-xs text-text-muted font-body truncate">
            {user?.role || ''}
          </p>
        </div>
        <button
          onClick={logout}
          className="p-1.5 text-text-muted hover:text-red-400 transition-colors"
          title="退出登录"
        >
          <LogOut className="h-4 w-4" />
        </button>
      </div>
    </aside>
  )
}

function cn(...classes: (string | undefined | false | null)[]) {
  return classes.filter(Boolean).join(' ')
}