// 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.
 
#nullable disable
 
using System;
using System.Collections.Concurrent;
using System.Composition;
using System.IO;
using Microsoft.CodeAnalysis.Host.Mef;
 
namespace Microsoft.CodeAnalysis.Host
{
    [ExportWorkspaceServiceFactory(typeof(IDocumentationProviderService), ServiceLayer.Default), Shared]
    internal sealed class DocumentationProviderServiceFactory : IWorkspaceServiceFactory
    {
        [ImportingConstructor]
        [Obsolete(MefConstruction.ImportingConstructorMessage, error: true)]
        public DocumentationProviderServiceFactory()
        {
        }
 
        public IWorkspaceService CreateService(HostWorkspaceServices workspaceServices)
            => new DocumentationProviderService();
 
        internal sealed class DocumentationProviderService : IDocumentationProviderService
        {
            private readonly ConcurrentDictionary<string, DocumentationProvider> _assemblyPathToDocumentationProviderMap =
                new();
 
            public DocumentationProvider GetDocumentationProvider(string assemblyPath)
            {
                if (assemblyPath == null)
                {
                    throw new ArgumentNullException(nameof(assemblyPath));
                }
 
                assemblyPath = Path.ChangeExtension(assemblyPath, "xml");
                if (!_assemblyPathToDocumentationProviderMap.TryGetValue(assemblyPath, out var provider))
                {
                    provider = _assemblyPathToDocumentationProviderMap.GetOrAdd(assemblyPath, XmlDocumentationProvider.CreateFromFile);
                }
 
                return provider;
            }
        }
    }
}