// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.

using System;
using System.Composition;

namespace Microsoft.CodeAnalysis.CodeFixes;

/// <summary>
/// Use this attribute to declare a <see cref="IConfigurationFixProvider"/> implementation so that it can be discovered by the host.
/// </summary>
[MetadataAttribute]
[AttributeUsage(AttributeTargets.Class)]
internal sealed class ExportConfigurationFixProviderAttribute : ExportAttribute
{
    /// <summary>
    /// The name of the <see cref="IConfigurationFixProvider"/>.  
    /// </summary>
    public string Name { get; }

    /// <summary>
    /// The source languages this provider can provide fixes for.  See <see cref="LanguageNames"/>.
    /// </summary>
    public string[] Languages { get; }

    public ExportConfigurationFixProviderAttribute(
        string name,
        params string[] languages)
        : base(typeof(IConfigurationFixProvider))
    {
        if (languages == null)
        {
            throw new ArgumentNullException(nameof(languages));
        }

        if (languages.Length == 0)
        {
            throw new ArgumentException(nameof(languages));
        }

        Languages = languages;
        Name = name ?? throw new ArgumentNullException(nameof(name));
    }
}