"use client";

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

export default function AuthForm() {
  const [mode, setMode] = useState<"login" | "register">("login");
  const [email, setEmail] = useState("");
  const [password, setPassword] = useState("");
  const [name, setName] = useState("");
  const [error, setError] = useState("");
  const [loading, setLoading] = useState(false);
  const router = useRouter();

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

    try {
      const endpoint = mode === "login" ? "/api/auth/login" : "/api/auth/register";
      const body = mode === "login"
        ? { email, password }
        : { email, password, name };

      const response = await fetch(endpoint, {
        method: "POST",
        headers: { "Content-Type": "application/json" },
        body: JSON.stringify(body),
      });

      const data = await response.json();

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

      // Store token for authenticated requests
      if (data.data?.token) {
        localStorage.setItem("token", data.data.token);
      }

      router.push("/");
    } catch (err: any) {
      setError(err.message);
    } finally {
      setLoading(false);
    }
  };

  return (
    <div className="w-full max-w-md mx-auto">
      <div className="bg-gray-800 rounded-2xl shadow-2xl p-8 border border-gray-700">
        <div className="text-center mb-8">
          <h2 className="text-3xl font-bold text-white mb-2">
            {mode === "login" ? "Welcome Back" : "Create Account"}
          </h2>
          <p className="text-gray-400">
            {mode === "login" ? "Sign in to continue" : "Join and start earning"}
          </p>
        </div>

        <form onSubmit={handleSubmit} className="space-y-6">
          {mode === "register" && (
            <div>
              <label htmlFor="name" className="block text-sm font-medium text-gray-300 mb-2">
                Name
              </label>
              <input
                id="name"
                type="text"
                value={name}
                onChange={(e) => setName(e.target.value)}
                required
                className="w-full px-4 py-3 bg-gray-900 border border-gray-600 rounded-lg text-white placeholder-gray-500 focus:outline-none focus:ring-2 focus:ring-yellow-500 focus:border-transparent transition"
                placeholder="Enter your name"
              />
            </div>
          )}

          <div>
            <label htmlFor="email" className="block text-sm font-medium text-gray-300 mb-2">
              Email
            </label>
            <input
              id="email"
              type="email"
              value={email}
              onChange={(e) => setEmail(e.target.value)}
              required
              className="w-full px-4 py-3 bg-gray-900 border border-gray-600 rounded-lg text-white placeholder-gray-500 focus:outline-none focus:ring-2 focus:ring-yellow-500 focus:border-transparent transition"
              placeholder="you@example.com"
            />
          </div>

          <div>
            <label htmlFor="password" className="block text-sm font-medium text-gray-300 mb-2">
              Password
            </label>
            <input
              id="password"
              type="password"
              value={password}
              onChange={(e) => setPassword(e.target.value)}
              required
              className="w-full px-4 py-3 bg-gray-900 border border-gray-600 rounded-lg text-white placeholder-gray-500 focus:outline-none focus:ring-2 focus:ring-yellow-500 focus:border-transparent transition"
              placeholder="••••••••"
            />
          </div>

          {error && (
            <div className="bg-red-500/10 border border-red-500 rounded-lg p-3">
              <p className="text-red-400 text-sm">{error}</p>
            </div>
          )}

          <button
            type="submit"
            disabled={loading}
            className="w-full bg-gradient-to-r from-yellow-500 to-orange-500 text-white font-semibold py-3 px-6 rounded-lg hover:from-yellow-600 hover:to-orange-600 transition transform hover:scale-105 disabled:opacity-50 disabled:cursor-not-allowed disabled:transform-none"
          >
            {loading ? "Processing..." : mode === "login" ? "Sign In" : "Create Account"}
          </button>
        </form>

        <div className="mt-6 text-center">
          <button
            onClick={() => setMode(mode === "login" ? "register" : "login")}
            className="text-yellow-400 hover:text-yellow-300 text-sm transition"
          >
            {mode === "login"
              ? "Don't have an account? Sign up"
              : "Already have an account? Sign in"}
          </button>
        </div>
      </div>
    </div>
  );
}