import { useState } from "react";
import { useTranslation } from "react-i18next";
import { Link, useNavigate } from "react-router-dom";
import { useAuthStore } from "@/stores/auth-store";
import { register } from "@/api/auth";

export function RegisterForm() {
  const { t } = useTranslation();
  const navigate = useNavigate();
  const setAuth = useAuthStore((s) => s.setAuth);

  const [email, setEmail] = useState("");
  const [username, setUsername] = useState("");
  const [password, setPassword] = useState("");
  const [confirmPassword, setConfirmPassword] = useState("");
  const [fullName, setFullName] = useState("");
  const [error, setError] = useState("");
  const [loading, setLoading] = useState(false);

  const handleSubmit = async (e: React.FormEvent) => {
    e.preventDefault();
    setError("");

    if (password.length < 8) {
      setError(t("auth.errors.passwordMinLength"));
      return;
    }

    if (password !== confirmPassword) {
      setError(t("auth.errors.passwordMismatch"));
      return;
    }

    if (!/^[a-zA-Z0-9_-]{3,50}$/.test(username)) {
      setError(t("auth.errors.usernameFormat"));
      return;
    }

    setLoading(true);

    try {
      const data = await register(email, username, password, fullName || undefined);
      setAuth(data.user, data.access_token, data.refresh_token);
      navigate("/");
    } catch (err: unknown) {
      const msg =
        (err as { response?: { data?: { detail?: string } } })?.response?.data?.detail ||
        t("auth.errors.emailExists");
      setError(msg);
    } finally {
      setLoading(false);
    }
  };

  return (
    <form onSubmit={handleSubmit} className="space-y-4">
      {error && (
        <div className="rounded-md bg-destructive/10 px-4 py-3 text-sm text-destructive">
          {error}
        </div>
      )}

      <div className="space-y-2">
        <label htmlFor="email" className="text-sm font-medium">
          {t("auth.email")}
        </label>
        <input
          id="email"
          type="email"
          value={email}
          onChange={(e) => setEmail(e.target.value)}
          required
          className="flex h-10 w-full rounded-md border border-input bg-background px-3 py-2 text-sm ring-offset-background placeholder:text-muted-foreground focus-visible:outline-none focus-visible:ring-2 focus-visible:ring-ring"
          placeholder="name@example.com"
        />
      </div>

      <div className="space-y-2">
        <label htmlFor="username" className="text-sm font-medium">
          {t("auth.username")}
        </label>
        <input
          id="username"
          type="text"
          value={username}
          onChange={(e) => setUsername(e.target.value)}
          required
          className="flex h-10 w-full rounded-md border border-input bg-background px-3 py-2 text-sm ring-offset-background placeholder:text-muted-foreground focus-visible:outline-none focus-visible:ring-2 focus-visible:ring-ring"
        />
      </div>

      <div className="space-y-2">
        <label htmlFor="fullName" className="text-sm font-medium">
          {t("auth.fullName")}
        </label>
        <input
          id="fullName"
          type="text"
          value={fullName}
          onChange={(e) => setFullName(e.target.value)}
          className="flex h-10 w-full rounded-md border border-input bg-background px-3 py-2 text-sm ring-offset-background placeholder:text-muted-foreground focus-visible:outline-none focus-visible:ring-2 focus-visible:ring-ring"
        />
      </div>

      <div className="space-y-2">
        <label htmlFor="password" className="text-sm font-medium">
          {t("auth.password")}
        </label>
        <input
          id="password"
          type="password"
          value={password}
          onChange={(e) => setPassword(e.target.value)}
          required
          minLength={8}
          className="flex h-10 w-full rounded-md border border-input bg-background px-3 py-2 text-sm ring-offset-background placeholder:text-muted-foreground focus-visible:outline-none focus-visible:ring-2 focus-visible:ring-ring"
        />
      </div>

      <div className="space-y-2">
        <label htmlFor="confirmPassword" className="text-sm font-medium">
          {t("auth.confirmPassword")}
        </label>
        <input
          id="confirmPassword"
          type="password"
          value={confirmPassword}
          onChange={(e) => setConfirmPassword(e.target.value)}
          required
          className="flex h-10 w-full rounded-md border border-input bg-background px-3 py-2 text-sm ring-offset-background placeholder:text-muted-foreground focus-visible:outline-none focus-visible:ring-2 focus-visible:ring-ring"
        />
      </div>

      <button
        type="submit"
        disabled={loading}
        className="inline-flex h-10 w-full items-center justify-center rounded-md bg-primary px-4 text-sm font-medium text-primary-foreground hover:bg-primary/90 disabled:opacity-50 transition-colors"
      >
        {loading ? t("common.loading") : t("auth.register")}
      </button>

      <p className="text-center text-sm text-muted-foreground">
        {t("auth.hasAccount")}{" "}
        <Link to="/login" className="text-primary hover:underline">
          {t("auth.login")}
        </Link>
      </p>
    </form>
  );
}