"use client";
import { useEffect, useState } from "react";
import Link from "next/link";
import { validateContact } from "@/lib/contacts";

type Contact = { id: number; name: string; email: string | null; telegramChatId: string | null };

export default function ContactsPage() {
  const [contacts, setContacts] = useState<Contact[]>([]);
  const [name, setName] = useState("");
  const [email, setEmail] = useState("");
  const [telegramChatId, setTelegramChatId] = useState("");
  const [errors, setErrors] = useState<string[]>([]);

  async function load() {
    const res = await fetch("/api/contacts");
    if (res.ok) setContacts(await res.json());
  }
  useEffect(() => { load(); }, []);

  async function onSubmit(e: React.FormEvent) {
    e.preventDefault();
    const input = { name, email: email || null, telegramChatId: telegramChatId || null };
    const errs = validateContact(input);
    setErrors(errs);
    if (errs.length) return;
    const res = await fetch("/api/contacts", {
      method: "POST",
      headers: { "content-type": "application/json" },
      body: JSON.stringify(input),
    });
    if (!res.ok) {
      const data = await res.json().catch(() => ({}));
      setErrors(data.errors ?? ["speichern"]);
      return;
    }
    setName(""); setEmail(""); setTelegramChatId(""); setErrors([]);
    load();
  }

  return (
    <main className="mx-auto max-w-xl space-y-4 p-6">
      <Link href="/" className="text-sm underline">← Zurück</Link>
      <h1 className="text-xl font-bold">Kontakte</h1>
      <form onSubmit={onSubmit} className="space-y-3" noValidate>
        <div>
          <label htmlFor="name" className="block text-sm font-medium">Name</label>
          <input id="name" value={name} onChange={(e) => setName(e.target.value)} className="mt-1 w-full rounded border px-3 py-2" />
        </div>
        <div>
          <label htmlFor="email" className="block text-sm font-medium">E-Mail</label>
          <input id="email" type="email" value={email} onChange={(e) => setEmail(e.target.value)} className="mt-1 w-full rounded border px-3 py-2" />
        </div>
        <div>
          <label htmlFor="telegramChatId" className="block text-sm font-medium">Telegram-Chat-ID</label>
          <input id="telegramChatId" value={telegramChatId} onChange={(e) => setTelegramChatId(e.target.value)} className="mt-1 w-full rounded border px-3 py-2" />
        </div>
        {errors.length > 0 && <p className="text-sm text-red-600">Ungültig: {errors.join(", ")}</p>}
        <button type="submit" className="rounded bg-black px-4 py-2 text-white">Hinzufügen</button>
      </form>
      <ul className="divide-y">
        {contacts.map((c) => (
          <li key={c.id} className="py-2 text-sm">
            <span className="font-medium">{c.name}</span>
            {c.email && <span> · {c.email}</span>}
            {c.telegramChatId && <span> · Telegram {c.telegramChatId}</span>}
          </li>
        ))}
      </ul>
    </main>
  );
}