"use client";

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

export default function RegisterPage() {
  const router = useRouter();
  const [formData, setFormData] = useState({
    username: "",
    email: "",
    password: "",
    confirmPassword: "",
  });
  const [error, setError] = useState("");
  const [loading, setLoading] = useState(false);

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

    // Validation
    if (formData.password !== formData.confirmPassword) {
      setError("Passwords do not match");
      return;
    }

    if (formData.password.length < 6) {
      setError("Password must be at least 6 characters long");
      return;
    }

    setLoading(true);

    try {
      const response = await fetch("/api/auth/register", {
        method: "POST",
        headers: { "Content-Type": "application/json" },
        body: JSON.stringify({
          username: formData.username,
          email: formData.email,
          password: formData.password,
        }),
      });

      const data = await response.json();

      if (!response.ok) {
        throw new Error(data.error || "Registration failed");
      }

      // Success - redirect to login
      router.push("/login?registered=true");
    } catch (err: any) {
      setError(err.message || "Registration failed. Please try again.");
    } finally {
      setLoading(false);
    }
  };

  return (
    <div className="min-h-screen bg-gradient-to-br from-blue-50 via-white to-blue-50 flex items-center justify-center p-4">
      <div className="max-w-md w-full bg-white rounded-lg shadow-lg p-8">
        <div className="text-center mb-6">
          <div className="w-16 h-16 bg-blue-600 rounded-lg flex items-center justify-center mx-auto mb-4">
            <svg className="w-10 h-10 text-white" fill="none" stroke="currentColor" viewBox="0 0 24 24">
              <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={2} d="M18 9v3m0 0v3m0-3h3m-3 0h-3m-2-5a4 4 0 11-8 0 4 4 0 018 0zM3 20a6 6 0 0112 0v1H3v-1z" />
            </svg>
          </div>
          <h1 className="text-2xl font-bold text-gray-900">Create Account</h1>
          <p className="text-gray-600 mt-2">Sign up for Location Tracker</p>
        </div>

        <form onSubmit={handleSubmit} className="space-y-4">
          <div>
            <label htmlFor="username" className="block text-sm font-medium text-gray-700 mb-1">
              Username *
            </label>
            <input
              id="username"
              type="text"
              value={formData.username}
              onChange={(e) => setFormData({ ...formData, username: e.target.value })}
              className="w-full px-3 py-2 border border-gray-300 rounded-md focus:outline-none focus:ring-2 focus:ring-blue-500"
              required
              minLength={3}
            />
            <p className="text-xs text-gray-500 mt-1">At least 3 characters</p>
          </div>

          <div>
            <label htmlFor="email" className="block text-sm font-medium text-gray-700 mb-1">
              Email *
            </label>
            <input
              id="email"
              type="email"
              value={formData.email}
              onChange={(e) => setFormData({ ...formData, email: e.target.value })}
              className="w-full px-3 py-2 border border-gray-300 rounded-md focus:outline-none focus:ring-2 focus:ring-blue-500"
              required
            />
          </div>

          <div>
            <label htmlFor="password" className="block text-sm font-medium text-gray-700 mb-1">
              Password *
            </label>
            <input
              id="password"
              type="password"
              value={formData.password}
              onChange={(e) => setFormData({ ...formData, password: e.target.value })}
              className="w-full px-3 py-2 border border-gray-300 rounded-md focus:outline-none focus:ring-2 focus:ring-blue-500"
              required
              minLength={6}
            />
            <p className="text-xs text-gray-500 mt-1">At least 6 characters</p>
          </div>

          <div>
            <label htmlFor="confirmPassword" className="block text-sm font-medium text-gray-700 mb-1">
              Confirm Password *
            </label>
            <input
              id="confirmPassword"
              type="password"
              value={formData.confirmPassword}
              onChange={(e) => setFormData({ ...formData, confirmPassword: e.target.value })}
              className="w-full px-3 py-2 border border-gray-300 rounded-md focus:outline-none focus:ring-2 focus:ring-blue-500"
              required
              minLength={6}
            />
          </div>

          {error && (
            <div className="bg-red-50 text-red-600 px-4 py-2 rounded-md text-sm">
              {error}
            </div>
          )}

          <button
            type="submit"
            disabled={loading}
            className="w-full px-4 py-2 bg-blue-600 text-white rounded-md hover:bg-blue-700 transition-colors font-medium disabled:opacity-50 disabled:cursor-not-allowed"
          >
            {loading ? "Creating Account..." : "Create Account"}
          </button>
        </form>

        <div className="mt-6 text-center text-sm">
          <span className="text-gray-600">Already have an account? </span>
          <Link href="/login" className="text-blue-600 hover:text-blue-700 font-medium">
            Sign in
          </Link>
        </div>

        <div className="mt-4 text-center">
          <Link href="/" className="text-sm text-gray-600 hover:text-gray-700">
            ← Back to Home
          </Link>
        </div>
      </div>
    </div>
  );
}