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// https://duplicati.com, hello@duplicati.com
// 
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// copy of this software and associated documentation files (the "Software"), 
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// Software is furnished to do so, subject to the following conditions:
// 
// The above copyright notice and this permission notice shall be included in 
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// 
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// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE 
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using System.Net.Http;

namespace Duplicati.Library.Utility;

/// <summary>
/// This class was created as a proxy to access the HttpClientFactory
/// in places where dependency injection is not yet implemented or
/// desirable.
/// </summary>
public static class HttpClientHelper
{

    /// <summary>
    /// Central HttpClient singleton instance to be used across the application as 
    /// per the HttpClientFactory recommended pattern.
    /// </summary>
    public static HttpClient DefaultClient { get; private set; }

    /// <summary>
    /// Reference to the HttpClientFactory instance so we can create specific clients
    /// when the singleton pattnern is not desirable.
    /// </summary>
    private static IHttpClientFactory _factory { get; set; }

    /// <summary>
    /// Sets the factory reference.
    /// </summary>
    /// <param name="factory">IHttpClientFactory instance</param>
    public static void Configure(IHttpClientFactory factory)
    {
        _factory = factory;
        DefaultClient = factory.CreateClient();
    }

    /// <summary>
    /// Creates a new HttpClient instance, to be used in places where the singleton
    /// pattern is not desirable.
    /// </summary>
    /// <returns></returns>
    public static HttpClient CreateClient()
    {
        return _factory?.CreateClient() ?? new HttpClient();
    }

    /// <summary>
    /// Creates a new HttpClient instance with a specific handler, wherever its needed.
    /// </summary>
    /// <param name="handler">HttpClientHandler configured with authentication parameters</param>
    /// <returns></returns>
    public static HttpClient CreateClient(HttpClientHandler handler)
    {
        return new HttpClient(handler);
    }
}