"use client";

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

export default function LoginPage() {
  const router = useRouter();
  const [error, setError] = useState("");
  const [loading, setLoading] = useState(false);

  async function handleSubmit(e: React.FormEvent<HTMLFormElement>) {
    e.preventDefault();
    setLoading(true);
    setError("");

    const formData = new FormData(e.currentTarget);

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

    if (res?.error) {
      setError("Invalid credentials");
      setLoading(false);
    } else {
      router.push("/admin");
    }
  }

  return (
    <div className="flex-1 flex items-center justify-center p-3 sm:p-6">
      <Card className="w-full max-w-sm">
        <CardHeader className="text-center">
          <CardTitle className="text-xl">Admin Login</CardTitle>
        </CardHeader>
        <CardContent>
          <form onSubmit={handleSubmit} className="space-y-4">
            <div className="space-y-2">
              <Label htmlFor="username">Username</Label>
              <Input id="username" name="username" type="text" required />
            </div>

            <div className="space-y-2">
              <Label htmlFor="password">Password</Label>
              <Input id="password" name="password" type="password" required />
            </div>

            {error && (
              <p className="text-destructive text-sm text-center">{error}</p>
            )}

            <Button type="submit" disabled={loading} className="w-full">
              {loading ? "Signing in..." : "Sign in"}
            </Button>
          </form>

          <div className="mt-4 text-center">
            <a
              href="/"
              className="text-sm text-muted-foreground hover:text-foreground transition"
            >
              Back to dashboard
            </a>
          </div>
        </CardContent>
      </Card>
    </div>
  );
}