"use client"

import { useState } from "react"
import { useRouter } from "next/navigation"
import Link from "next/link"
import { Button } from "@/components/ui/button"
import { Input } from "@/components/ui/input"
import { Label } from "@/components/ui/label"
import { Card, CardContent, CardDescription, CardFooter, CardHeader, CardTitle } from "@/components/ui/card"
import { Alert, AlertDescription } from "@/components/ui/alert"
import { BookOpen } from "lucide-react"

export default function RegisterPage() {
  const router = useRouter()
  const [name, setName] = useState("")
  const [email, setEmail] = useState("")
  const [password, setPassword] = useState("")
  const [confirmPassword, setConfirmPassword] = useState("")
  const [error, setError] = useState("")
  const [loading, setLoading] = useState(false)

  const handleSubmit = async (e: React.FormEvent) => {
    e.preventDefault()
    setError("")

    if (password !== confirmPassword) {
      setError("两次输入的密码不一致")
      return
    }

    if (password.length < 6) {
      setError("密码至少需要6个字符")
      return
    }

    setLoading(true)

    try {
      const response = await fetch("/api/auth/register", {
        method: "POST",
        headers: {
          "Content-Type": "application/json",
        },
        body: JSON.stringify({
          name,
          email,
          password,
        }),
      })

      const data = await response.json()

      if (!response.ok) {
        setError(data.error || "注册失败")
        return
      }

      // 注册成功，跳转到登录页
      router.push("/auth/signin?registered=true")
    } catch (err) {
      setError("注册失败，请稍后重试")
    } finally {
      setLoading(false)
    }
  }

  return (
    <div className="min-h-screen flex items-center justify-center bg-gradient-to-br from-primary/5 via-background to-secondary/5 p-4">
      <Card className="w-full max-w-md">
        <CardHeader className="space-y-1 text-center">
          <div className="flex justify-center mb-4">
            <div className="flex h-12 w-12 items-center justify-center rounded-lg bg-primary text-primary-foreground">
              <BookOpen className="h-7 w-7" />
            </div>
          </div>
          <CardTitle className="text-2xl font-serif">注册</CardTitle>
          <CardDescription>
            创建您的华夏谱账号
          </CardDescription>
        </CardHeader>
        <form onSubmit={handleSubmit}>
          <CardContent className="space-y-4">
            {error && (
              <Alert variant="destructive">
                <AlertDescription>{error}</AlertDescription>
              </Alert>
            )}
            
            <Alert className="bg-blue-50 border-blue-200 dark:bg-blue-950 dark:border-blue-800">
              <AlertDescription className="text-sm text-blue-800 dark:text-blue-200">
                💡 系统已有测试账号，建议直接<Link href="/auth/signin" className="underline font-semibold">登录</Link>使用
              </AlertDescription>
            </Alert>
            
            <div className="space-y-2">
              <Label htmlFor="name">姓名</Label>
              <Input
                id="name"
                type="text"
                placeholder="张三"
                value={name}
                onChange={(e) => setName(e.target.value)}
                disabled={loading}
              />
            </div>
            
            <div className="space-y-2">
              <Label htmlFor="email">邮箱</Label>
              <Input
                id="email"
                type="email"
                placeholder="your@email.com"
                value={email}
                onChange={(e) => setEmail(e.target.value)}
                required
                disabled={loading}
              />
            </div>
            
            <div className="space-y-2">
              <Label htmlFor="password">密码</Label>
              <Input
                id="password"
                type="password"
                placeholder="至少6个字符"
                value={password}
                onChange={(e) => setPassword(e.target.value)}
                required
                disabled={loading}
              />
            </div>
            
            <div className="space-y-2">
              <Label htmlFor="confirmPassword">确认密码</Label>
              <Input
                id="confirmPassword"
                type="password"
                placeholder="再次输入密码"
                value={confirmPassword}
                onChange={(e) => setConfirmPassword(e.target.value)}
                required
                disabled={loading}
              />
            </div>
          </CardContent>
          
          <CardFooter className="flex flex-col space-y-4">
            <Button 
              type="submit" 
              className="w-full"
              disabled={loading}
            >
              {loading ? "注册中..." : "注册"}
            </Button>
            
            <div className="text-sm text-center text-muted-foreground">
              已有账号？{" "}
              <Link href="/auth/signin" className="text-primary hover:underline">
                立即登录
              </Link>
            </div>
          </CardFooter>
        </form>
      </Card>
    </div>
  )
}