"use client";

import { createClient } from "@/lib/supabase/client";
import { useRouter } from "next/navigation";
import { useState } from "react";

export default function LoginPage() {
  const [email, setEmail] = useState("");
  const [password, setPassword] = useState("");
  const [mode, setMode] = useState<"password" | "magic">("password");
  const [loading, setLoading] = useState(false);
  const [error, setError] = useState<string | null>(null);
  const [magicSent, setMagicSent] = useState(false);
  const router = useRouter();
  const supabase = createClient();

  async function handlePasswordLogin(e: React.FormEvent) {
    e.preventDefault();
    setLoading(true);
    setError(null);

    const { error } = await supabase.auth.signInWithPassword({
      email,
      password,
    });

    if (error) {
      setError(error.message);
      setLoading(false);
      return;
    }

    router.push("/");
    router.refresh();
  }

  async function handleMagicLink(e: React.FormEvent) {
    e.preventDefault();
    setLoading(true);
    setError(null);

    const { error } = await supabase.auth.signInWithOtp({
      email,
      options: {
        emailRedirectTo: `${window.location.origin}/callback`,
      },
    });

    if (error) {
      setError(error.message);
      setLoading(false);
      return;
    }

    setMagicSent(true);
    setLoading(false);
  }

  if (magicSent) {
    return (
      <div className="flex min-h-screen items-center justify-center bg-neutral-50">
        <div className="w-full max-w-sm space-y-6 rounded-lg border border-neutral-200 bg-white p-8">
          <div className="text-center">
            <h1 className="text-lg font-semibold text-neutral-900">
              Link gesendet
            </h1>
            <p className="mt-2 text-sm text-neutral-500">
              Wir haben einen Login-Link an{" "}
              <span className="font-medium text-neutral-700">{email}</span>{" "}
              gesendet. Bitte pruefen Sie Ihren Posteingang.
            </p>
          </div>
          <button
            onClick={() => setMagicSent(false)}
            className="w-full text-center text-sm text-neutral-500 hover:text-neutral-700"
          >
            Zurueck zum Login
          </button>
        </div>
      </div>
    );
  }

  return (
    <div className="flex min-h-screen items-center justify-center bg-neutral-50">
      <div className="w-full max-w-sm space-y-6 rounded-lg border border-neutral-200 bg-white p-8">
        <div className="text-center">
          <h1 className="text-lg font-semibold text-neutral-900">
            KanzlAI
          </h1>
          <p className="mt-1 text-sm text-neutral-500">
            Melden Sie sich an
          </p>
        </div>

        <div className="flex rounded-md border border-neutral-200 bg-neutral-50 p-0.5">
          <button
            onClick={() => setMode("password")}
            className={`flex-1 rounded-md px-3 py-1.5 text-sm font-medium transition-colors ${
              mode === "password"
                ? "bg-white text-neutral-900 shadow-sm"
                : "text-neutral-500 hover:text-neutral-700"
            }`}
          >
            Passwort
          </button>
          <button
            onClick={() => setMode("magic")}
            className={`flex-1 rounded-md px-3 py-1.5 text-sm font-medium transition-colors ${
              mode === "magic"
                ? "bg-white text-neutral-900 shadow-sm"
                : "text-neutral-500 hover:text-neutral-700"
            }`}
          >
            Magic Link
          </button>
        </div>

        <form
          onSubmit={mode === "password" ? handlePasswordLogin : handleMagicLink}
          className="space-y-4"
        >
          <div>
            <label
              htmlFor="email"
              className="block text-sm font-medium text-neutral-700"
            >
              E-Mail
            </label>
            <input
              id="email"
              type="email"
              value={email}
              onChange={(e) => setEmail(e.target.value)}
              required
              className="mt-1 block w-full rounded-md border border-neutral-300 px-3 py-2 text-sm placeholder-neutral-400 focus:border-neutral-900 focus:outline-none focus:ring-1 focus:ring-neutral-900"
              placeholder="anwalt@kanzlei.de"
            />
          </div>

          {mode === "password" && (
            <div>
              <label
                htmlFor="password"
                className="block text-sm font-medium text-neutral-700"
              >
                Passwort
              </label>
              <input
                id="password"
                type="password"
                value={password}
                onChange={(e) => setPassword(e.target.value)}
                required
                className="mt-1 block w-full rounded-md border border-neutral-300 px-3 py-2 text-sm placeholder-neutral-400 focus:border-neutral-900 focus:outline-none focus:ring-1 focus:ring-neutral-900"
              />
            </div>
          )}

          {error && (
            <p className="text-sm text-red-600">{error}</p>
          )}

          <button
            type="submit"
            disabled={loading}
            className="w-full rounded-md bg-neutral-900 px-4 py-2 text-sm font-medium text-white hover:bg-neutral-800 focus:outline-none focus:ring-2 focus:ring-neutral-900 focus:ring-offset-2 disabled:opacity-50"
          >
            {loading
              ? "..."
              : mode === "password"
                ? "Anmelden"
                : "Link senden"}
          </button>
        </form>

        <p className="text-center text-sm text-neutral-500">
          Noch kein Konto?{" "}
          <a
            href="/register"
            className="font-medium text-neutral-900 hover:underline"
          >
            Registrieren
          </a>
        </p>
      </div>
    </div>
  );
}