"use client";

import { useState, type FormEvent } from "react";
import { useRouter } from "next/navigation";
import { TextField, FormError } from "@/components/FormField";
import { TurnstileWidget } from "@/components/TurnstileWidget";

export function RegisterForm({ siteKey }: { siteKey: string }) {
  const router = useRouter();
  const [error, setError] = useState<string | null>(null);
  const [loading, setLoading] = useState(false);
  const [token, setToken] = useState<string | null>(null);
  const [resetKey, setResetKey] = useState(0);

  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, token }),
      });
      if (!createRes.ok) {
        const body = await createRes.json().catch(() => null);
        setError(body?.error || body?.errors?.[0]?.message || "Die Registrierung ist fehlgeschlagen. Ist die E-Mail-Adresse schon vergeben?");
        setLoading(false);
        return;
      }

      // Login is separately protected by its own single-use Turnstile token.
      router.push("/login?registered=1");
    } catch {
      setError("Verbindung fehlgeschlagen. Bitte versuche es erneut.");
      setLoading(false);
    } finally {
      setResetKey((key) => key + 1);
    }
  }

  return (
    <form onSubmit={handleSubmit} className="space-y-5">
      <TextField label="Name" id="name" name="name" type="text" required autoComplete="name" />
      <TextField label="E-Mail" id="email" name="email" type="email" required autoComplete="email" />
      <TextField
        label="Passwort"
        id="password"
        name="password"
        type="password"
        required
        minLength={8}
        autoComplete="new-password"
      />
      <TurnstileWidget siteKey={siteKey} action="registration" resetKey={resetKey} onTokenChange={setToken} />
      {error && <FormError>{error}</FormError>}
      <button
        type="submit"
        disabled={loading || !token}
        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>
  );
}