// 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.Collections.Generic;
using System.Runtime.Serialization;
using System.Threading;
using System.Threading.Tasks;
using Microsoft.CodeAnalysis.CodeActions;
using Microsoft.CodeAnalysis.CodeCleanup;
using Microsoft.CodeAnalysis.Diagnostics;
using Microsoft.CodeAnalysis.Editing;
using Microsoft.CodeAnalysis.Host;
using Microsoft.CodeAnalysis.Options;
using Microsoft.CodeAnalysis.Shared.Extensions;
using Roslyn.Utilities;
 
namespace Microsoft.CodeAnalysis.AddImport
{
    internal interface IAddImportsService : ILanguageService
    {
        AddImportPlacementOptions GetAddImportOptions(IOptionsReader configOptions, bool allowInHiddenRegions, AddImportPlacementOptions? fallbackOptions);
 
        /// <summary>
        /// Returns true if the tree already has an existing import syntactically equivalent to
        /// <paramref name="import"/> in scope at <paramref name="contextLocation"/>.  This includes
        /// global imports for VB.
        /// </summary>
        bool HasExistingImport(Compilation compilation, SyntaxNode root, SyntaxNode? contextLocation, SyntaxNode import, SyntaxGenerator generator);
 
        /// <summary>
        /// Given a context location in a provided syntax tree, returns the appropriate container
        /// that <paramref name="import"/> should be added to.
        /// </summary>
        SyntaxNode GetImportContainer(SyntaxNode root, SyntaxNode? contextLocation, SyntaxNode import, AddImportPlacementOptions options);
 
        SyntaxNode AddImports(
            Compilation compilation, SyntaxNode root, SyntaxNode? contextLocation,
            IEnumerable<SyntaxNode> newImports, SyntaxGenerator generator, AddImportPlacementOptions options, CancellationToken cancellationToken);
    }
 
    internal static class IAddImportServiceExtensions
    {
        public static SyntaxNode AddImport(
            this IAddImportsService service, Compilation compilation, SyntaxNode root,
            SyntaxNode contextLocation, SyntaxNode newImport, SyntaxGenerator generator, AddImportPlacementOptions options,
            CancellationToken cancellationToken)
        {
            return service.AddImports(compilation, root, contextLocation,
                SpecializedCollections.SingletonEnumerable(newImport), generator, options, cancellationToken);
        }
    }
}