"use client";

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

function BindForm() {
  const searchParams = useSearchParams();
  const router = useRouter();
  const keycloakId = searchParams.get("keycloakId") || "";
  const keycloakEmail = searchParams.get("email") || "";

  const [username, setUsername] = useState("");
  const [password, setPassword] = useState("");
  const [error, setError] = useState("");

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

    const res = await fetch("/api/proxy/auth/bind-keycloak", {
      method: "POST",
      headers: { "Content-Type": "application/json" },
      body: JSON.stringify({
        username,
        password,
        keycloakId,
        keycloakEmail,
      }),
    });

    if (!res.ok) {
      const data = await res.json();
      setError(data.error || "绑定失败");
      return;
    }

    const data = await res.json();
    if (data.bound) {
      await signIn("keycloak", { callbackUrl: "/dashboard" });
    }
  }

  return (
    <Card className="w-full max-w-md">
      <CardHeader>
        <CardTitle className="text-center">绑定本地账号</CardTitle>
      </CardHeader>
      <CardContent className="space-y-4">
        <p className="text-sm text-muted-foreground">
          您的 Keycloak 账号（{keycloakEmail || keycloakId}）尚未绑定本地账户。
          请输入已有的本地账号密码完成绑定。
        </p>
        <form onSubmit={handleSubmit} className="space-y-4">
          <div>
            <Label htmlFor="username">本地用户名</Label>
            <Input
              id="username"
              value={username}
              onChange={(e) => setUsername(e.target.value)}
              required
            />
          </div>
          <div>
            <Label htmlFor="password">本地密码</Label>
            <Input
              id="password"
              type="password"
              value={password}
              onChange={(e) => setPassword(e.target.value)}
              required
            />
          </div>
          {error && <p className="text-sm text-destructive">{error}</p>}
          <Button type="submit" className="w-full">
            绑定并登录
          </Button>
        </form>
      </CardContent>
    </Card>
  );
}

export default function BindAccountPage() {
  return (
    <div className="flex min-h-screen items-center justify-center bg-gradient-to-br from-background via-background to-muted/40 p-4">
      <Suspense fallback={<div className="text-sm text-muted-foreground">加载中...</div>}>
        <BindForm />
      </Suspense>
    </div>
  );
}