"use client";

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

export default function LoginPage() {
  const router = useRouter();
  const [username, setUsername] = useState("");
  const [password, setPassword] = useState("");
  const [error, setError] = useState<string | null>(null);
  const [loading, setLoading] = useState(false);

  async function handleSubmit(e: React.FormEvent) {
    e.preventDefault();
    setError(null);
    setLoading(true);
    try {
      const res = await fetch("/backend/auth/login", {
        method: "POST",
        headers: { "Content-Type": "application/json" },
        credentials: "include",
        body: JSON.stringify({ username, password }),
      });
      if (!res.ok) {
        const data = await res.json().catch(() => ({}));
        setError(data.error ?? "Échec de la connexion");
        return;
      }
      router.push("/dashboard");
    } catch {
      setError("Erreur réseau. Réessayez.");
    } finally {
      setLoading(false);
    }
  }

  return (
    <div className="flex min-h-screen flex-col items-center justify-center bg-zinc-50 px-4 dark:bg-black">
      <main className="w-full max-w-sm">
        <p className="mb-8 text-center text-sm text-zinc-500 dark:text-zinc-400">
          Connectez-vous pour continuer
        </p>

        <form
          onSubmit={handleSubmit}
          className="flex flex-col gap-4 rounded-2xl border border-zinc-200 bg-white p-6 shadow-sm dark:border-zinc-800 dark:bg-zinc-950"
        >
          <label className="flex flex-col gap-1 text-sm font-medium text-zinc-700 dark:text-zinc-300">
            Nom d&apos;utilisateur
            <input
              type="text"
              autoComplete="username"
              value={username}
              onChange={(e) => setUsername(e.target.value)}
              required
              className="rounded-lg border border-zinc-300 bg-white px-3 py-2 text-base text-black outline-none focus:border-zinc-500 dark:border-zinc-700 dark:bg-black dark:text-zinc-50"
            />
          </label>

          <label className="flex flex-col gap-1 text-sm font-medium text-zinc-700 dark:text-zinc-300">
            Mot de passe
            <input
              type="password"
              autoComplete="current-password"
              value={password}
              onChange={(e) => setPassword(e.target.value)}
              required
              className="rounded-lg border border-zinc-300 bg-white px-3 py-2 text-base text-black outline-none focus:border-zinc-500 dark:border-zinc-700 dark:bg-black dark:text-zinc-50"
            />
          </label>

          {error && (
            <p className="text-sm text-red-600 dark:text-red-400" role="alert">
              {error}
            </p>
          )}

          <button
            type="submit"
            disabled={loading}
            className="mt-2 rounded-lg bg-black px-4 py-2.5 text-base font-medium text-white transition-colors hover:bg-zinc-800 disabled:opacity-60 dark:bg-white dark:text-black dark:hover:bg-zinc-200"
          >
            {loading ? "Connexion…" : "Se connecter"}
          </button>
        </form>
      </main>
    </div>
  );
}