"use client";

import { signIn, useSession } from "next-auth/react";
import { useRouter } from "next/navigation";
import { useState } from "react";

export default function LoginPage() {
  const [email, setEmail] = useState("");
  const [password, setPassword] = useState("");
  const [isLoading, setIsLoading] = useState(false);
  const router = useRouter();
  const { data: session } = useSession();

  // 如果已登录，重定向到仪表板
  if (session) {
    router.push("/dashboard");
    return null;
  }

  const handleSubmit = async (e: React.FormEvent) => {
    e.preventDefault();
    setIsLoading(true);

    try {
      const result = await signIn("credentials", {
        email,
        password,
        redirect: false,
      });

      if (result?.ok) {
        router.push("/dashboard");
      } else {
        alert("登录失败，请检查邮箱和密码");
      }
    } catch {
      alert("登录失败，请重试");
    } finally {
      setIsLoading(false);
    }
  };

  const handleGoogleSignIn = () => {
    signIn("google", { callbackUrl: "/dashboard" });
  };

  return (
    <div className="min-h-screen flex items-center justify-center bg-gray-50 py-12 px-4 sm:px-6 lg:px-8">
      <div className="max-w-md w-full space-y-8">
        <div>
          <h2 className="mt-6 text-center text-3xl font-extrabold text-gray-900">
            登录账户
          </h2>
        </div>
        <form className="mt-8 space-y-6" onSubmit={handleSubmit}>
          <div className="rounded-md shadow-sm -space-y-px">
            <div>
              <input
                type="email"
                required
                className="appearance-none rounded-none relative block w-full px-3 py-2 border border-gray-300 placeholder-gray-500 text-gray-900 rounded-t-md focus:outline-none focus:ring-indigo-500 focus:border-indigo-500 focus:z-10 sm:text-sm"
                placeholder="邮箱地址"
                value={email}
                onChange={(e) => setEmail(e.target.value)}
              />
            </div>
            <div>
              <input
                type="password"
                required
                className="appearance-none rounded-none relative block w-full px-3 py-2 border border-gray-300 placeholder-gray-500 text-gray-900 rounded-b-md focus:outline-none focus:ring-indigo-500 focus:border-indigo-500 focus:z-10 sm:text-sm"
                placeholder="密码"
                value={password}
                onChange={(e) => setPassword(e.target.value)}
              />
            </div>
          </div>

          <div>
            <button
              type="submit"
              disabled={isLoading}
              className="group relative w-full flex justify-center py-2 px-4 border border-transparent text-sm font-medium rounded-md text-white bg-indigo-600 hover:bg-indigo-700 focus:outline-none focus:ring-2 focus:ring-offset-2 focus:ring-indigo-500 disabled:opacity-50"
            >
              {isLoading ? "登录中..." : "登录"}
            </button>
          </div>

          <div>
            <button
              type="button"
              onClick={handleGoogleSignIn}
              className="group relative w-full flex justify-center py-2 px-4 border border-gray-300 text-sm font-medium rounded-md text-gray-700 bg-white hover:bg-gray-50 focus:outline-none focus:ring-2 focus:ring-offset-2 focus:ring-indigo-500"
            >
              使用 Google 登录
            </button>
          </div>

          <div className="text-center">
            <a
              href="/register"
              className="font-medium text-indigo-600 hover:text-indigo-500"
            >
              还没有账户？注册
            </a>
          </div>
        </form>
      </div>
    </div>
  );
}
