// <copyright file="SystemClock.cs" company="Selenium Committers">
// Licensed to the Software Freedom Conservancy (SFC) under one
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// regarding copyright ownership.  The SFC licenses this file
// to you 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,
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// </copyright>

using System;

namespace OpenQA.Selenium.Support.UI;

/// <summary>
/// Uses the system clock to calculate time for timeouts.
/// </summary>
public class SystemClock : IClock
{
    /// <summary>
    /// An instance of the <see cref="SystemClock"/> type.
    /// </summary>
    public static SystemClock Instance { get; } = new();

    /// <summary>
    /// Gets the current date and time values.
    /// </summary>
    public DateTime Now => DateTime.Now;

    /// <summary>
    /// Calculates the date and time values after a specific delay.
    /// </summary>
    /// <param name="delay">The delay after to calculate.</param>
    /// <returns>The future date and time values.</returns>
    public DateTime LaterBy(TimeSpan delay) => DateTime.Now.Add(delay);

    /// <summary>
    /// Gets a value indicating whether the current date and time is before the specified date and time.
    /// </summary>
    /// <param name="otherDateTime">The date and time values to compare the current date and time values to.</param>
    /// <returns><see langword="true"/> if the current date and time is before the specified date and time; otherwise, <see langword="false"/>.</returns>
    public bool IsNowBefore(DateTime otherDateTime) => DateTime.Now < otherDateTime;
}
