"use client";

import { useState, type FormEvent } from "react";
import { useRouter } from "next/navigation";

const fieldClass =
  "w-full rounded-2xl border border-anouma-taupe/30 bg-white px-5 py-3.5 text-base text-anouma-plum placeholder:text-anouma-plum/50 focus:border-anouma-mauve-dark focus:outline-none";

export function RegisterForm() {
  const router = useRouter();
  const [error, setError] = useState<string | null>(null);
  const [loading, setLoading] = useState(false);

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

    const data = new FormData(e.currentTarget);
    const name = String(data.get("name") ?? "");
    const email = String(data.get("email") ?? "");
    const password = String(data.get("password") ?? "");

    try {
      const createRes = await fetch("/api/customers", {
        method: "POST",
        headers: { "Content-Type": "application/json" },
        body: JSON.stringify({ name, email, password }),
      });
      if (!createRes.ok) {
        const body = await createRes.json().catch(() => null);
        setError(body?.errors?.[0]?.message || "Die Registrierung ist fehlgeschlagen. Ist die E-Mail-Adresse schon vergeben?");
        setLoading(false);
        return;
      }

      const loginRes = await fetch("/api/customers/login", {
        method: "POST",
        headers: { "Content-Type": "application/json" },
        credentials: "include",
        body: JSON.stringify({ email, password }),
      });
      if (!loginRes.ok) {
        router.push("/login");
        return;
      }
      router.push("/konto");
      router.refresh();
    } catch {
      setError("Verbindung fehlgeschlagen. Bitte versuche es erneut.");
      setLoading(false);
    }
  }

  return (
    <form onSubmit={handleSubmit} className="space-y-5">
      <div>
        <label htmlFor="name" className="mb-2 block text-sm font-medium text-anouma-plum">
          Name
        </label>
        <input id="name" name="name" type="text" required className={fieldClass} autoComplete="name" />
      </div>
      <div>
        <label htmlFor="email" className="mb-2 block text-sm font-medium text-anouma-plum">
          E-Mail
        </label>
        <input id="email" name="email" type="email" required className={fieldClass} autoComplete="email" />
      </div>
      <div>
        <label htmlFor="password" className="mb-2 block text-sm font-medium text-anouma-plum">
          Passwort
        </label>
        <input
          id="password"
          name="password"
          type="password"
          required
          minLength={8}
          className={fieldClass}
          autoComplete="new-password"
        />
      </div>
      {error && (
        <p role="alert" className="text-sm text-red-700">
          {error}
        </p>
      )}
      <button
        type="submit"
        disabled={loading}
        className="w-full rounded-full bg-anouma-mauve-dark px-7 py-3.5 text-sm font-medium tracking-wide text-white transition-colors duration-300 hover:bg-anouma-plum disabled:opacity-60"
      >
        {loading ? "Wird erstellt …" : "Konto erstellen"}
      </button>
    </form>
  );
}