/*
# SPDX-FileCopyrightText: Copyright (c) 1993-2025 NVIDIA CORPORATION & AFFILIATES. All rights reserved.
# SPDX-License-Identifier: Apache-2.0
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
*/
"use client";

import { useState, useEffect } from 'react';

export default function ThemeToggle() {
  const [isDark, setIsDark] = useState(false);

  useEffect(() => {
    // Check if user has a theme preference
    const isDarkMode = localStorage.getItem('theme') === 'dark' ||
      (!localStorage.getItem('theme') && window.matchMedia('(prefers-color-scheme: dark)').matches);
    
    setIsDark(isDarkMode);
    if (isDarkMode) {
      document.documentElement.classList.add('dark');
    }
  }, []);

  const toggleTheme = () => {
    setIsDark(!isDark);
    if (!isDark) {
      document.documentElement.classList.add('dark');
      localStorage.setItem('theme', 'dark');
    } else {
      document.documentElement.classList.remove('dark');
      localStorage.setItem('theme', 'light');
    }
  };

  return (
    <button
      onClick={toggleTheme}
      className="fixed top-4 right-4 p-2 rounded-full bg-white dark:bg-gray-800 shadow-lg hover:shadow-xl transition-all duration-200 z-50"
      aria-label="Toggle theme"
    >
      {isDark ? (
        <svg className="w-6 h-6 text-yellow-500" fill="none" stroke="currentColor" viewBox="0 0 24 24">
          <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={2} d="M12 3v1m0 16v1m9-9h-1M4 12H3m15.364 6.364l-.707-.707M6.343 6.343l-.707-.707m12.728 0l-.707.707M6.343 17.657l-.707.707M16 12a4 4 0 11-8 0 4 4 0 018 0z" />
        </svg>
      ) : (
        <svg className="w-6 h-6 text-gray-700" fill="none" stroke="currentColor" viewBox="0 0 24 24">
          <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={2} d="M20.354 15.354A9 9 0 018.646 3.646 9.003 9.003 0 0012 21a9.003 9.003 0 008.354-5.646z" />
        </svg>
      )}
    </button>
  );
} 