lemonspace_app/app/auth/sign-in/page.tsx

"use client";

import { useState } from "react";
import { authClient } from "@/lib/auth-client";
import { useRouter } from "next/navigation";
import Link from "next/link";

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

  const handleSignIn = async (e: React.FormEvent) => {
    e.preventDefault();
    setError("");
    setLoading(true);

    try {
      const result = await authClient.signIn.email({
        email,
        password,
      });

      if (result.error) {
        setError(result.error.message ?? "Anmeldung fehlgeschlagen");
      } else {
        router.push("/dashboard");
      }
    } catch {
      setError("Ein unerwarteter Fehler ist aufgetreten");
    } finally {
      setLoading(false);
    }
  };

  const handleMagicLink = async () => {
    setError("");
    setMagicLinkMessage("");

    if (!email) {
      setError("Bitte gib deine E-Mail-Adresse ein");
      return;
    }

    setMagicLinkLoading(true);
    try {
      const result = await authClient.signIn.magicLink({
        email,
        callbackURL: "/dashboard",
        errorCallbackURL: "/auth/sign-in",
      });

      if (result.error) {
        setError(result.error.message ?? "Magic Link konnte nicht gesendet werden");
      } else {
        setMagicLinkMessage("Magic Link gesendet. Prüfe dein Postfach.");
      }
    } catch {
      setError("Ein unerwarteter Fehler ist aufgetreten");
    } finally {
      setMagicLinkLoading(false);
    }
  };

  return (
    <div className="flex min-h-screen items-center justify-center bg-background">
      <div className="w-full max-w-sm space-y-6 rounded-xl border bg-card p-8 shadow-sm">
        <div className="text-center">
          <h1 className="text-2xl font-semibold">Willkommen zurück 🍋</h1>
          <p className="mt-1 text-sm text-muted-foreground">
            Melde dich bei LemonSpace an
          </p>
        </div>

        <form onSubmit={handleSignIn} className="space-y-4">
          <div>
            <label htmlFor="email" className="block text-sm font-medium mb-1.5">
              E-Mail
            </label>
            <input
              id="email"
              type="email"
              value={email}
              onChange={(e) => setEmail(e.target.value)}
              required
              className="w-full rounded-lg border bg-background px-3 py-2 text-sm outline-none focus:ring-2 focus:ring-primary"
              placeholder="name@beispiel.de"
            />
          </div>

          <div>
            <label htmlFor="password" className="block text-sm font-medium mb-1.5">
              Passwort
            </label>
            <input
              id="password"
              type="password"
              value={password}
              onChange={(e) => setPassword(e.target.value)}
              required
              className="w-full rounded-lg border bg-background px-3 py-2 text-sm outline-none focus:ring-2 focus:ring-primary"
              placeholder="Dein Passwort"
            />
          </div>

          {error && (
            <p className="text-sm text-red-500">{error}</p>
          )}

          <button
            type="submit"
            disabled={loading}
            className="w-full rounded-lg bg-primary px-4 py-2.5 text-sm font-medium text-primary-foreground hover:bg-primary/90 disabled:opacity-50 transition-colors"
          >
            {loading ? "Wird angemeldet…" : "Anmelden"}
          </button>

          <button
            type="button"
            disabled={magicLinkLoading}
            onClick={handleMagicLink}
            className="w-full rounded-lg border bg-background px-4 py-2.5 text-sm font-medium hover:bg-muted disabled:opacity-50 transition-colors"
          >
            {magicLinkLoading ? "Wird gesendet…" : "Magic Link senden"}
          </button>
          {magicLinkMessage && (
            <p className="text-sm text-emerald-600">{magicLinkMessage}</p>
          )}
        </form>

        <p className="text-center text-sm text-muted-foreground">
          Noch kein Konto?{" "}
          <Link href="/auth/sign-up" className="font-medium text-primary hover:underline">
            Registrieren
          </Link>
        </p>
      </div>
    </div>
  );
}