"use client";

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

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

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

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

    setLoading(false);

    if (res?.error) {
      setError("E-Mail oder Passwort falsch.");
    } else {
      router.push("/");
      router.refresh();
    }
  }

  return (
    <div className="min-h-screen bg-gradient-to-br from-indigo-50 to-blue-50 flex items-center justify-center p-4">
      <div className="w-full max-w-md">
        <div className="text-center mb-8">
          <div className="inline-flex items-center justify-center w-14 h-14 rounded-2xl bg-indigo-600 mb-4">
            <Calculator className="w-7 h-7 text-white" />
          </div>
          <h1 className="text-2xl font-bold text-gray-900">Annas Rechnungsmanager</h1>
          <p className="text-gray-500 mt-1">Buchhaltung & Rechnungsverwaltung</p>
        </div>

        <Card>
          <CardHeader>
            <CardTitle>Anmelden</CardTitle>
            <CardDescription>Geben Sie Ihre Zugangsdaten ein</CardDescription>
          </CardHeader>
          <CardContent>
            <form onSubmit={handleSubmit} className="space-y-4">
              {error && (
                <div className="flex items-center gap-2 rounded-lg bg-red-50 border border-red-200 p-3 text-sm text-red-700">
                  <AlertCircle className="h-4 w-4 shrink-0" />
                  {error}
                </div>
              )}

              <div className="space-y-1.5">
                <Label htmlFor="email">E-Mail</Label>
                <Input
                  id="email"
                  type="email"
                  placeholder="anna@example.de"
                  value={email}
                  onChange={(e) => setEmail(e.target.value)}
                  required
                  autoComplete="email"
                />
              </div>

              <div className="space-y-1.5">
                <Label htmlFor="password">Passwort</Label>
                <Input
                  id="password"
                  type="password"
                  value={password}
                  onChange={(e) => setPassword(e.target.value)}
                  required
                  autoComplete="current-password"
                />
              </div>

              <Button type="submit" className="w-full" disabled={loading}>
                {loading ? "Anmelden..." : "Anmelden"}
              </Button>
            </form>
          </CardContent>
        </Card>
      </div>
    </div>
  );
}