'use client'

import { useState } from 'react'
import Link from 'next/link'
import { usePathname } from 'next/navigation'
import { useAuth } from '@/contexts/AuthContext'

interface NavigationProps {
  showExitLearning?: boolean
  onExitLearning?: () => void
}

export function Navigation({ showExitLearning = false, onExitLearning }: NavigationProps = {}) {
  const { user, logout } = useAuth()
  const pathname = usePathname()
  const [isMobileMenuOpen, setIsMobileMenuOpen] = useState(false)

  const navItems = [
    { href: '/dashboard', label: '儀表板' },
    { href: '/flashcards', label: '詞卡' },
    { href: '/review', label: '複習' },
    { href: '/generate', label: 'AI 生成' }
  ]

  return (
    <nav className="bg-white shadow-sm border-b">
      <div className="max-w-7xl mx-auto px-4 sm:px-6 lg:px-8">
        <div className="flex justify-between h-16">
          <div className="flex items-center space-x-8">
            {/* 手機版漢堡選單按鈕 */}
            <button
              onClick={() => setIsMobileMenuOpen(!isMobileMenuOpen)}
              className="md:hidden p-2 text-gray-600 hover:text-gray-900"
            >
              <svg className="w-6 h-6" fill="none" stroke="currentColor" viewBox="0 0 24 24">
                {isMobileMenuOpen ? (
                  <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={2} d="M6 18L18 6M6 6l12 12" />
                ) : (
                  <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={2} d="M4 6h16M4 12h16M4 18h16" />
                )}
              </svg>
            </button>

            <Link href="/dashboard" className="text-2xl font-bold text-primary">
              DramaLing
            </Link>

            <div className="hidden md:flex space-x-6">
              {navItems.map((item) => (
                <Link
                  key={item.href}
                  href={item.href}
                  className={`font-medium transition-colors ${
                    pathname === item.href
                      ? 'text-primary'
                      : 'text-gray-600 hover:text-gray-900'
                  }`}
                >
                  {item.label}
                </Link>
              ))}
            </div>
          </div>

          <div className="flex items-center space-x-4">
            {/* 複習模式的結束複習按鈕 */}
            {showExitLearning ? (
              <button
                onClick={onExitLearning}
                className="text-gray-600 hover:text-gray-900"
              >
                × 結束複習
              </button>
            ) : (
              <>
                {/* 通知按鈕 - 桌面和手機都顯示 */}
                <button className="p-2 text-gray-600 hover:text-gray-900">
                  <svg className="w-6 h-6" fill="none" stroke="currentColor" viewBox="0 0 24 24">
                    <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={2} d="M15 17h5l-1.405-1.405A2.032 2.032 0 0118 14.158V11a6.002 6.002 0 00-4-5.659V5a2 2 0 10-4 0v.341C7.67 6.165 6 8.388 6 11v3.159c0 .538-.214 1.055-.595 1.436L4 17h5m6 0v1a3 3 0 11-6 0v-1m6 0H9" />
                  </svg>
                </button>

                {/* 用戶資訊 - 只在桌面版顯示 */}
                <div className="hidden md:flex items-center space-x-3">
                  <Link
                    href="/profile"
                    className="flex items-center space-x-2 hover:bg-gray-100 rounded-lg px-2 py-1 transition-colors"
                  >
                    <div className="w-8 h-8 bg-primary rounded-full flex items-center justify-center text-white font-semibold">
                      {user?.username?.[0]?.toUpperCase() || 'U'}
                    </div>
                    <span className="text-sm font-medium text-gray-700">{user?.displayName || user?.username}</span>
                  </Link>
                  <button
                    onClick={logout}
                    className="text-sm text-gray-600 hover:text-gray-900 px-2 py-1 hover:bg-gray-100 rounded"
                  >
                    登出
                  </button>
                </div>
              </>
            )}
          </div>
        </div>

        {/* 手機版下拉選單 */}
        {isMobileMenuOpen && (
          <div className="md:hidden border-t border-gray-200">
            <div className="px-4 py-4 space-y-2">
              {navItems.map((item) => (
                <Link
                  key={item.href}
                  href={item.href}
                  onClick={() => setIsMobileMenuOpen(false)}
                  className={`block py-2 px-3 rounded-lg font-medium transition-colors ${
                    pathname === item.href
                      ? 'bg-primary text-white'
                      : 'text-gray-600 hover:text-gray-900 hover:bg-gray-100'
                  }`}
                >
                  {item.label}
                </Link>
              ))}

              {/* 手機版用戶區域 */}
              <div className="pt-4 border-t border-gray-200 mt-4">
                <Link
                  href="/profile"
                  onClick={() => setIsMobileMenuOpen(false)}
                  className="flex items-center space-x-3 px-3 py-2 hover:bg-gray-100 rounded-lg transition-colors"
                >
                  <div className="w-8 h-8 bg-primary rounded-full flex items-center justify-center text-white font-semibold">
                    {user?.username?.[0]?.toUpperCase() || 'U'}
                  </div>
                  <span className="text-sm font-medium">👤 個人檔案</span>
                </Link>
                <button
                  onClick={() => {
                    logout()
                    setIsMobileMenuOpen(false)
                  }}
                  className="w-full text-left py-2 px-3 text-gray-600 hover:text-gray-900 hover:bg-gray-100 rounded-lg"
                >
                  登出
                </button>
              </div>
            </div>
          </div>
        )}
      </div>
    </nav>
  )
}