// 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.IO;
using Microsoft.CodeAnalysis.LanguageService;
using Microsoft.CodeAnalysis.Shared.Utilities;

namespace Microsoft.CodeAnalysis.Utilities;

internal static class WorkspacePathUtilities
{
    /// <summary>
    /// Returns true if a type name matches a document name. We use
    /// case insensitive matching to determine this match so that files
    /// "a.cs" and "A.cs" both match a class called "A" 
    /// </summary>
    public static bool TypeNameMatchesDocumentName(Document document, string typeName)
        => GetTypeNameFromDocumentName(document)?.Equals(typeName, StringComparison.OrdinalIgnoreCase) == true;

    /// <summary>
    /// Standard way to get the display name from a SyntaxNode. If the display
    /// name is null, returns false. Otherwise uses <see cref="TypeNameMatchesDocumentName(Document, string)"/>
    /// </summary>
    public static bool TypeNameMatchesDocumentName(Document document, SyntaxNode typeDeclaration, ISyntaxFacts syntaxFacts)
    {
        var name = syntaxFacts.GetDisplayName(typeDeclaration, DisplayNameOptions.None);
        return name != null && TypeNameMatchesDocumentName(document, name);
    }

    /// <summary>
    /// Gets a type name based on a document name. Returns null
    /// if the document has no name or the document has invalid characters in the name
    /// such that <see cref="Path.GetFileNameWithoutExtension(string?)"/> would throw.
    /// </summary>
    public static string? GetTypeNameFromDocumentName(Document document)
    {
        if (document.Name is null)
        {
            return null;
        }

        return IOUtilities.PerformIO(() => Path.GetFileNameWithoutExtension(document.Name));
    }
}