evanpage/frontend/app/login/login-form.tsx

"use client";

import { useState } from "react";
import { signIn } from "next-auth/react";
import { useSearchParams } from "next/navigation";
import { Button } from "@/components/ui/button";
import { Input } from "@/components/ui/input";
import { Label } from "@/components/ui/label";
import { Card, CardContent, CardHeader, CardTitle } from "@/components/ui/card";

export function LoginForm({ hasKeycloak }: { hasKeycloak: boolean }) {
  const searchParams = useSearchParams();
  const callbackUrl = searchParams.get("callbackUrl") || "/dashboard";
  const [username, setUsername] = useState("");
  const [password, setPassword] = useState("");
  const [error, setError] = useState("");

  async function handleSubmit(e: React.FormEvent) {
    e.preventDefault();
    setError("");

    const res = await signIn("credentials", {
      username,
      password,
      redirect: false,
      callbackUrl,
    });

    if (res?.error) {
      setError("登录失败，请检查用户名和密码");
    } else {
      const redirectUrl = callbackUrl.startsWith("http")
        ? callbackUrl
        : window.location.origin + callbackUrl;
      window.location.href = redirectUrl;
    }
  }

  return (
    <Card className="w-full max-w-md">
      <CardHeader>
        <CardTitle className="text-center">登录</CardTitle>
      </CardHeader>
      <CardContent className="space-y-4">
        <form onSubmit={handleSubmit} className="space-y-4">
          <div>
            <Label htmlFor="username">用户名</Label>
            <Input
              id="username"
              value={username}
              onChange={(e) => setUsername(e.target.value)}
              required
            />
          </div>
          <div>
            <Label htmlFor="password">密码</Label>
            <Input
              id="password"
              type="password"
              value={password}
              onChange={(e) => setPassword(e.target.value)}
              required
            />
          </div>
          {error && <p className="text-sm text-red-500">{error}</p>}
          <Button type="submit" className="w-full">
            本地账号登录
          </Button>
        </form>

        {hasKeycloak && (
          <>
            <div className="relative">
              <div className="absolute inset-0 flex items-center">
                <span className="w-full border-t" />
              </div>
              <div className="relative flex justify-center text-xs uppercase">
                <span className="bg-white px-2 text-gray-500">或者</span>
              </div>
            </div>

            <Button
              variant="outline"
              className="w-full"
              onClick={() => signIn("keycloak", { callbackUrl })}
            >
              Keycloak 登录
            </Button>
          </>
        )}

        <p className="text-center text-sm text-gray-500">
          还没有账号？{" "}
          <a href="/register" className="text-blue-600 hover:underline">
            立即注册
          </a>
        </p>
      </CardContent>
    </Card>
  );
}