// 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.Threading.Tasks;
using System.Threading;
using Microsoft.CodeAnalysis.Text;
using Roslyn.Utilities;
 
namespace Microsoft.CodeAnalysis.Shared.Extensions;
 
internal static partial class TextDocumentExtensions
{
#if CODE_STYLE
    public static ValueTask<SourceText> GetValueTextAsync(this TextDocument document, CancellationToken cancellationToken)
    {
        if (document.TryGetText(out var text))
            return ValueTaskFactory.FromResult(text);
 
        return new ValueTask<SourceText>(document.GetTextAsync(cancellationToken));
    }
#endif
 
    /// <summary>
    /// Creates a new instance of this text document updated to have the text specified.
    /// </summary>
    public static TextDocument WithText(this TextDocument textDocument, SourceText text)
    {
        switch (textDocument)
        {
            case Document document:
                return document.WithText(text);
 
            case AnalyzerConfigDocument analyzerConfigDocument:
                return analyzerConfigDocument.WithAnalyzerConfigDocumentText(text);
 
            case AdditionalDocument additionalDocument:
                return additionalDocument.WithAdditionalDocumentText(text);
 
            default:
                throw ExceptionUtilities.Unreachable();
        }
    }
 
    /// <summary>
    /// Creates a new instance of this additional document updated to have the text specified.
    /// </summary>
    public static TextDocument WithAdditionalDocumentText(this TextDocument textDocument, SourceText text)
    {
        Contract.ThrowIfFalse(textDocument is AdditionalDocument);
        return textDocument.Project.Solution.WithAdditionalDocumentText(textDocument.Id, text, PreservationMode.PreserveIdentity).GetTextDocument(textDocument.Id)!;
    }
 
    /// <summary>
    /// Creates a new instance of this analyzer config document updated to have the text specified.
    /// </summary>
    public static TextDocument WithAnalyzerConfigDocumentText(this TextDocument textDocument, SourceText text)
    {
        Contract.ThrowIfFalse(textDocument is AnalyzerConfigDocument);
        return textDocument.Project.Solution.WithAnalyzerConfigDocumentText(textDocument.Id, text, PreservationMode.PreserveIdentity).GetTextDocument(textDocument.Id)!;
    }
}