// 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.Diagnostics.CodeAnalysis;
using System.Linq;
using Microsoft.VisualStudio.LanguageServices;
using Microsoft.VisualStudio.LanguageServices.Implementation.ProjectSystem;
 
namespace Microsoft.CodeAnalysis.ExternalAccess.FSharp.LanguageServices;
 
internal static class FSharpVisualStudioWorkspaceExtensions
{
    public static Metadata GetMetadata(this VisualStudioWorkspace workspace, string fullPath, DateTime snapshotTimestamp)
    {
        var metadataReferenceProvider = workspace.Services.GetRequiredService<VisualStudioMetadataReferenceManager>();
        return metadataReferenceProvider.GetMetadata(fullPath, snapshotTimestamp);
    }
 
    [Obsolete("When Roslyn/ProjectSystem integration is finished, don't use this.")]
    public static bool TryGetProjectIdByBinPath(this VisualStudioWorkspace workspace, string filePath, [NotNullWhen(true)] out ProjectId? projectId)
    {
        var projects = workspace.CurrentSolution.Projects.Where(p => string.Equals(p.OutputFilePath, filePath, StringComparison.OrdinalIgnoreCase)).ToList();
 
        if (projects.Count == 1)
        {
            projectId = projects[0].Id;
            return true;
        }
        else
        {
            projectId = null;
            return false;
        }
    }
 
    [Obsolete("When Roslyn/ProjectSystem integration is finished, don't use this.")]
    public static ProjectId GetOrCreateProjectIdForPath(this VisualStudioWorkspace workspace, string filePath, string projectDisplayName)
    {
        // HACK: to keep F# working, we will ensure we return the ProjectId if there is a project that matches this path. Otherwise, we'll just return
        // a random ProjectId, which is sufficient for their needs. They'll simply observe there is no project with that ID, and then go and create a
        // new project. Then they call this function again, and fetch the real ID.
        return workspace.CurrentSolution.Projects.FirstOrDefault(p => p.FilePath == filePath)?.Id ?? ProjectId.CreateNewId("ProjectNotFound");
    }
 
    [Obsolete("When Roslyn/ProjectSystem integration is finished, don't use this.")]
    public static string? GetProjectFilePath(this VisualStudioWorkspace workspace, ProjectId projectId)
    {
        return workspace.CurrentSolution.GetProject(projectId)?.FilePath;
    }
}