"use client";

import { useState } from "react";
import { signIn } from "next-auth/react";

type Mode = "login" | "register";

export function AuthModal({
  onClose,
  onSuccess,
}: {
  onClose: () => void;
  onSuccess: () => void;
}) {
  const [mode, setMode] = useState<Mode>("login");
  const [name, setName] = useState("");
  const [email, setEmail] = 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 {
      if (mode === "register") {
        const res = await fetch("/api/register", {
          method: "POST",
          headers: { "Content-Type": "application/json" },
          body: JSON.stringify({ name, email, password }),
        });
        const data = (await res.json()) as { error?: string };
        if (!res.ok) {
          setError(data.error ?? "Erreur");
          return;
        }
      }
      const result = await signIn("credentials", {
        email,
        password,
        redirect: false,
      });
      if (result?.error) {
        setError("Email ou mot de passe incorrect");
        return;
      }
      onSuccess();
    } finally {
      setLoading(false);
    }
  }

  const inputCls =
    "w-full min-h-11 px-3.5 bg-[#0f0f0f] border-[1.5px] border-[#2e2e2e] rounded-xl text-[#f0f0f0] text-sm outline-none focus:border-[#7c3aed]";

  return (
    <div
      className="fixed inset-0 bg-black/70 flex items-center justify-center z-1000 p-4"
      onClick={onClose}
    >
      <div
        className="relative bg-[#1a1a1a] border border-[#2e2e2e] rounded-xl p-8 w-full max-w-96 animate-fade-in"
        onClick={(e) => e.stopPropagation()}
      >
        <button
          className="absolute top-3 right-3.5 text-[#888] hover:text-[#f0f0f0] text-lg leading-none px-1.5 py-1 cursor-pointer bg-transparent border-none"
          onClick={onClose}
          aria-label="Fermer"
        >
          ✕
        </button>

        <div className="flex border-b border-[#2e2e2e] mb-6">
          {(["login", "register"] as Mode[]).map((m) => (
            <button
              key={m}
              className={`flex-1 text-sm font-semibold py-2.5 border-b-2 -mb-px cursor-pointer bg-transparent transition-colors ${mode === m ? "text-[#7c3aed] border-[#7c3aed]" : "text-[#888] border-transparent hover:text-[#f0f0f0]"}`}
              onClick={() => {
                setMode(m);
                setError(null);
              }}
            >
              {m === "login" ? "Connexion" : "Inscription"}
            </button>
          ))}
        </div>

        <form className="flex flex-col gap-3" onSubmit={handleSubmit}>
          {mode === "register" && (
            <input
              className={inputCls}
              type="text"
              placeholder="Pseudo"
              value={name}
              onChange={(e) => setName(e.target.value)}
              required
              maxLength={30}
            />
          )}
          <input
            className={inputCls}
            type="email"
            placeholder="Email"
            value={email}
            onChange={(e) => setEmail(e.target.value)}
            required
          />
          <input
            className={inputCls}
            type="password"
            placeholder="Mot de passe"
            value={password}
            onChange={(e) => setPassword(e.target.value)}
            required
            minLength={6}
          />

          {error && (
            <div className="bg-red-950/40 border border-red-600 text-red-300 px-3 py-2 rounded-xl text-sm">
              {error}
            </div>
          )}

          <button
            className="w-full min-h-11 px-5 rounded-xl text-sm font-semibold bg-[#7c3aed] text-white hover:bg-[#6d28d9] disabled:opacity-50 cursor-pointer mt-1"
            type="submit"
            disabled={loading}
          >
            {loading
              ? "Chargement..."
              : mode === "login"
                ? "Se connecter"
                : "Créer un compte"}
          </button>
          {mode === "register" && (
            <p className="text-xs text-[#555] text-center leading-relaxed">
              En créant un compte, vous acceptez notre{" "}
              <a
                href="/privacy"
                className="text-[#888] hover:text-[#f0f0f0] underline underline-offset-2 transition-colors"
              >
                politique de confidentialité
              </a>
              .
            </p>
          )}
        </form>
      </div>
    </div>
  );
}