"use client";

import { useState, FormEvent } from "react";
import { useRouter } from "next/navigation";
import Link from "next/link";

const API_BASE_URL = process.env.NEXT_PUBLIC_API_BASE_URL || "http://localhost:8000/api/v1";

export default function RegisterPage() {
  const [formData, setFormData] = useState({
    email: "",
    password: "",
    re_password: "",
    first_name: "",
    last_name: "",
  });
  const [error, setError] = useState<string>("");
  const [fieldErrors, setFieldErrors] = useState<Record<string, string[]>>({});
  const [loading, setLoading] = useState(false);
  const [success, setSuccess] = useState(false);
  const router = useRouter();

  const handleChange = (e: React.ChangeEvent<HTMLInputElement>) => {
    setFormData({
      ...formData,
      [e.target.name]: e.target.value,
    });
    // Clear field error when user starts typing
    if (fieldErrors[e.target.name]) {
      const newErrors = { ...fieldErrors };
      delete newErrors[e.target.name];
      setFieldErrors(newErrors);
    }
  };

  const handleSubmit = async (e: FormEvent<HTMLFormElement>) => {
    e.preventDefault();
    setError("");
    setFieldErrors({});
    setLoading(true);

    try {
      const response = await fetch(`${API_BASE_URL}/auth/users/`, {
        method: "POST",
        headers: {
          "Content-Type": "application/json",
        },
        body: JSON.stringify(formData),
      });

      const data = await response.json();

      if (!response.ok) {
        if (data.email || data.password || data.first_name || data.last_name) {
          setFieldErrors(data);
        } else if (data.detail) {
          setError(data.detail);
        } else {
          setError("Kayıt başarısız. Lütfen bilgilerinizi kontrol edin.");
        }
      } else {
        setSuccess(true);
        setTimeout(() => {
          router.push("/auth/login");
        }, 3000);
      }
    } catch (err) {
      setError("Bir hata oluştu. Lütfen tekrar deneyin.");
      console.error("Registration error:", err);
    } finally {
      setLoading(false);
    }
  };

  if (success) {
    return (
      <div className="min-h-screen flex items-center justify-center bg-gray-50">
        <div className="max-w-md w-full space-y-8 p-8 bg-white rounded-lg shadow">
          <div className="text-center">
            <div className="mx-auto flex items-center justify-center h-12 w-12 rounded-full bg-green-100">
              <svg
                className="h-6 w-6 text-green-600"
                fill="none"
                stroke="currentColor"
                viewBox="0 0 24 24"
              >
                <path
                  strokeLinecap="round"
                  strokeLinejoin="round"
                  strokeWidth="2"
                  d="M5 13l4 4L19 7"
                />
              </svg>
            </div>
            <h2 className="mt-6 text-center text-3xl font-bold text-gray-900">
              Kayıt Başarılı!
            </h2>
            <p className="mt-2 text-center text-sm text-gray-600">
              Email adresinize gönderilen aktivasyon linkine tıklayarak hesabınızı aktifleştirin.
            </p>
            <p className="mt-2 text-center text-sm text-gray-500">
              Giriş sayfasına yönlendiriliyorsunuz...
            </p>
          </div>
        </div>
      </div>
    );
  }

  return (
    <div className="min-h-screen flex items-center justify-center bg-gray-50 py-12 px-4 sm:px-6 lg:px-8">
      <div className="max-w-md w-full space-y-8">
        <div>
          <h2 className="mt-6 text-center text-3xl font-bold text-gray-900">
            Hesap Oluştur
          </h2>
          <p className="mt-2 text-center text-sm text-gray-600">
            Veya{" "}
            <Link
              href="/auth/login"
              className="font-medium text-blue-600 hover:text-blue-500"
            >
              mevcut hesabınızla giriş yapın
            </Link>
          </p>
        </div>
        <form className="mt-8 space-y-6" onSubmit={handleSubmit}>
          <div className="rounded-md shadow-sm space-y-4">
            <div className="grid grid-cols-2 gap-4">
              <div>
                <label htmlFor="first_name" className="block text-sm font-medium text-gray-700 mb-1">
                  Ad
                </label>
                <input
                  id="first_name"
                  name="first_name"
                  type="text"
                  className={`appearance-none relative block w-full px-3 py-2 border ${
                    fieldErrors.first_name ? "border-red-300" : "border-gray-300"
                  } placeholder-gray-500 text-gray-900 rounded-md focus:outline-none focus:ring-blue-500 focus:border-blue-500 sm:text-sm`}
                  placeholder="Ad"
                  value={formData.first_name}
                  onChange={handleChange}
                />
                {fieldErrors.first_name && (
                  <p className="mt-1 text-sm text-red-600">{fieldErrors.first_name[0]}</p>
                )}
              </div>
              <div>
                <label htmlFor="last_name" className="block text-sm font-medium text-gray-700 mb-1">
                  Soyad
                </label>
                <input
                  id="last_name"
                  name="last_name"
                  type="text"
                  className={`appearance-none relative block w-full px-3 py-2 border ${
                    fieldErrors.last_name ? "border-red-300" : "border-gray-300"
                  } placeholder-gray-500 text-gray-900 rounded-md focus:outline-none focus:ring-blue-500 focus:border-blue-500 sm:text-sm`}
                  placeholder="Soyad"
                  value={formData.last_name}
                  onChange={handleChange}
                />
                {fieldErrors.last_name && (
                  <p className="mt-1 text-sm text-red-600">{fieldErrors.last_name[0]}</p>
                )}
              </div>
            </div>

            <div>
              <label htmlFor="email" className="block text-sm font-medium text-gray-700 mb-1">
                Email adresi
              </label>
              <input
                id="email"
                name="email"
                type="email"
                autoComplete="email"
                required
                className={`appearance-none relative block w-full px-3 py-2 border ${
                  fieldErrors.email ? "border-red-300" : "border-gray-300"
                } placeholder-gray-500 text-gray-900 rounded-md focus:outline-none focus:ring-blue-500 focus:border-blue-500 sm:text-sm`}
                placeholder="ornek@email.com"
                value={formData.email}
                onChange={handleChange}
              />
              {fieldErrors.email && (
                <p className="mt-1 text-sm text-red-600">{fieldErrors.email[0]}</p>
              )}
            </div>

            <div>
              <label htmlFor="password" className="block text-sm font-medium text-gray-700 mb-1">
                Şifre
              </label>
              <input
                id="password"
                name="password"
                type="password"
                autoComplete="new-password"
                required
                className={`appearance-none relative block w-full px-3 py-2 border ${
                  fieldErrors.password ? "border-red-300" : "border-gray-300"
                } placeholder-gray-500 text-gray-900 rounded-md focus:outline-none focus:ring-blue-500 focus:border-blue-500 sm:text-sm`}
                placeholder="Minimum 8 karakter"
                value={formData.password}
                onChange={handleChange}
              />
              {fieldErrors.password && (
                <p className="mt-1 text-sm text-red-600">{fieldErrors.password[0]}</p>
              )}
            </div>

            <div>
              <label htmlFor="re_password" className="block text-sm font-medium text-gray-700 mb-1">
                Şifre Tekrar
              </label>
              <input
                id="re_password"
                name="re_password"
                type="password"
                autoComplete="new-password"
                required
                className={`appearance-none relative block w-full px-3 py-2 border ${
                  fieldErrors.re_password ? "border-red-300" : "border-gray-300"
                } placeholder-gray-500 text-gray-900 rounded-md focus:outline-none focus:ring-blue-500 focus:border-blue-500 sm:text-sm`}
                placeholder="Şifrenizi tekrar girin"
                value={formData.re_password}
                onChange={handleChange}
              />
              {fieldErrors.re_password && (
                <p className="mt-1 text-sm text-red-600">{fieldErrors.re_password[0]}</p>
              )}
            </div>
          </div>

          {error && (
            <div className="rounded-md bg-red-50 p-4">
              <p className="text-sm text-red-800">{error}</p>
            </div>
          )}

          <div>
            <button
              type="submit"
              disabled={loading}
              className="group relative w-full flex justify-center py-2 px-4 border border-transparent text-sm font-medium rounded-md text-white bg-blue-600 hover:bg-blue-700 focus:outline-none focus:ring-2 focus:ring-offset-2 focus:ring-blue-500 disabled:opacity-50 disabled:cursor-not-allowed"
            >
              {loading ? "Kayıt yapılıyor..." : "Kayıt Ol"}
            </button>
          </div>
        </form>
      </div>
    </div>
  );
}