"use client";

import Link from "next/link";
import { useEffect, useState } from "react";
import { usePathname } from "next/navigation";

type ContactData = {
  email?: string;
  linkedin?: string;
  github?: string;
};

export default function ContactComponent() {
  const pathname = usePathname();
  const onContactPage = pathname === "/contact";

  const [data, setData] = useState<ContactData | null>(null);

  useEffect(() => {
    if (!onContactPage) return;

    // Appelle l'API interne Next.js qui proxy vers le BACKEND_URL côté serveur
    const url = "/api/contact";

    fetch(url, { cache: "no-store" })
      .then((res) => (res.ok ? res.json() : Promise.reject(new Error("fetch contact failed"))))
      .then((json) => setData(json))
      .catch(() => setData(null));
  }, [onContactPage]);

  // Si on n'est pas sur la page /contact => juste un lien
  if (!onContactPage) {
    return (
      <div className="block">
        <div className="btn-group">
          <Link href="/contact" className="btn btn--primary btn--pill">
            Me contacter
          </Link>
        </div>
      </div>
    );
  }

  // Page /contact => liens + formulaire
  return (
    <div className="block">
      <div className="stack">
        <div className="btn-group">
          {data?.linkedin ? (
            <a href={data.linkedin} target="_blank" rel="noopener noreferrer" className="link-button">
              LinkedIn
            </a>
          ) : null}
          {data?.github ? (
            <a href={data.github} target="_blank" rel="noopener noreferrer" className="link-button">
              GitHub
            </a>
          ) : null}
          {data?.email ? (
            <a href={`mailto:${data.email}`} className="link-button">
              Email direct
            </a>
          ) : null}
        </div>

        {data?.email ? (
          <ContactForm />
        ) : (
          <p className="u-muted"></p>
        )}
      </div>
    </div>
  );
}

function ContactForm() {
  const [name, setName] = useState("");
  const [email, setEmail] = useState("");
  const [subject, setSubject] = useState("");
  const [message, setMessage] = useState("");
  const [status, setStatus] = useState<"idle" | "loading" | "success" | "error">("idle");
  const [error, setError] = useState<string | null>(null);

  async function handleSubmit(e: React.FormEvent) {
    e.preventDefault();
    setError(null);

    if (!name || !email || !message) {
      setError("Veuillez remplir les champs requis.");
      return;
    }

    setStatus("loading");
    try {
      const res = await fetch("/api/contact", {
        method: "POST",
        headers: { "Content-Type": "application/json" },
        body: JSON.stringify({ name, email, subject, message }),
      });

      if (!res.ok) {
        const txt = await res.text();
        throw new Error(txt || "Erreur lors de l'envoi du message");
      }

      setStatus("success");
      setName("");
      setEmail("");
      setSubject("");
      setMessage("");
    } catch (err: any) {
      setStatus("error");
      setError(err?.message || "Une erreur est survenue.");
    }
  }

  return (
    <form onSubmit={handleSubmit} className="stack" noValidate>
      <div>
        <label htmlFor="name">Votre nom</label>
        <input id="name" name="name" type="text" required value={name} onChange={(e) => setName(e.target.value)} />
      </div>

      <div>
        <label htmlFor="email">Votre email</label>
        <input id="email" name="email" type="email" required value={email} onChange={(e) => setEmail(e.target.value)} />
      </div>

      <div>
        <label htmlFor="subject">Sujet</label>
        <input id="subject" name="subject" type="text" placeholder="Prise de contact" value={subject} onChange={(e) => setSubject(e.target.value)} />
      </div>

      <div>
        <label htmlFor="message">Message</label>
        <textarea id="message" name="message" required value={message} onChange={(e) => setMessage(e.target.value)} />
      </div>

      {status === "success" ? (
        <p className="u-success">Votre message a bien été envoyé. Merci !</p>
      ) : null}
      {status === "error" && error ? (
        <p className="u-error">{error}</p>
      ) : null}

      <div className="btn-group">
        <button type="submit" className="btn btn--primary btn--pill" disabled={status === "loading"}>
          {status === "loading" ? "Envoi…" : "Envoyer"}
        </button>
        <button
          type="button"
          className="btn btn--ghost"
          onClick={() => {
            setName("");
            setEmail("");
            setSubject("");
            setMessage("");
            setError(null);
            setStatus("idle");
          }}
          disabled={status === "loading"}
        >
          Réinitialiser
        </button>
      </div>
    </form>
  );
}