"use client";

import { useEffect } from "react";
import { useRouter } from "next/navigation";
import { useAuth } from "@/lib/auth-context";

const GOOGLE_CLIENT_ID = process.env.NEXT_PUBLIC_GOOGLE_CLIENT_ID || "";
const REDIRECT_URI = `${typeof window !== "undefined" ? window.location.origin : ""}/login/callback`;

export default function LoginPage() {
  const router = useRouter();
  const { isAuthenticated, isLoading } = useAuth();

  useEffect(() => {
    if (!isLoading && isAuthenticated) {
      router.replace("/dashboard");
    }
  }, [isAuthenticated, isLoading, router]);

  const handleGoogleLogin = () => {
    const params = new URLSearchParams({
      client_id: GOOGLE_CLIENT_ID,
      redirect_uri: REDIRECT_URI,
      response_type: "code",
      scope: "openid email profile",
      access_type: "offline",
      prompt: "consent",
    });
    window.location.href = `https://accounts.google.com/o/oauth2/v2/auth?${params.toString()}`;
  };

  return (
    <div className="flex items-center justify-center min-h-screen">
      <div className="bg-[var(--color-bg-card)] rounded-2xl p-8 w-full max-w-md shadow-xl border border-[var(--color-border)]">
        <div className="text-center mb-8">
          <h1 className="text-3xl font-bold mb-2">SUNDOL</h1>
          <p className="text-[var(--color-text-muted)]">
            Smart Unified Natural Dog-Operated Layer
          </p>
        </div>
        <button
          onClick={handleGoogleLogin}
          className="w-full py-3 px-4 bg-white text-gray-800 rounded-lg font-medium hover:bg-gray-100 transition-colors flex items-center justify-center gap-3"
        >
          <svg className="w-5 h-5" viewBox="0 0 24 24">
            <path fill="#4285F4" d="M22.56 12.25c0-.78-.07-1.53-.2-2.25H12v4.26h5.92a5.06 5.06 0 0 1-2.2 3.32v2.77h3.57c2.08-1.92 3.28-4.74 3.28-8.1z"/>
            <path fill="#34A853" d="M12 23c2.97 0 5.46-.98 7.28-2.66l-3.57-2.77c-.98.66-2.23 1.06-3.71 1.06-2.86 0-5.29-1.93-6.16-4.53H2.18v2.84C3.99 20.53 7.7 23 12 23z"/>
            <path fill="#FBBC05" d="M5.84 14.09c-.22-.66-.35-1.36-.35-2.09s.13-1.43.35-2.09V7.07H2.18C1.43 8.55 1 10.22 1 12s.43 3.45 1.18 4.93l2.85-2.22.81-.62z"/>
            <path fill="#EA4335" d="M12 5.38c1.62 0 3.06.56 4.21 1.64l3.15-3.15C17.45 2.09 14.97 1 12 1 7.7 1 3.99 3.47 2.18 7.07l3.66 2.84c.87-2.6 3.3-4.53 6.16-4.53z"/>
          </svg>
          Sign in with Google
        </button>
      </div>
    </div>
  );
}