// 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.Composition;
using Microsoft.CodeAnalysis.Host.Mef;
 
namespace Microsoft.CodeAnalysis.CSharp
{
    [ExportLanguageService(typeof(ILinkedFileMergeConflictCommentAdditionService), LanguageNames.CSharp), Shared]
    internal sealed class CSharpLinkedFileMergeConflictCommentAdditionService : AbstractLinkedFileMergeConflictCommentAdditionService
    {
        [ImportingConstructor]
        [Obsolete(MefConstruction.ImportingConstructorMessage, error: true)]
        public CSharpLinkedFileMergeConflictCommentAdditionService()
        {
        }
 
        internal override string GetConflictCommentText(string header, string beforeString, string afterString)
        {
            if (beforeString == null && afterString == null)
            {
                // Whitespace only
                return null;
            }
            else if (beforeString == null)
            {
                // New code
                return string.Format(@"
/* {0}
{1}
{2}
*/
",
                header,
                WorkspacesResources.Added_colon,
                afterString);
            }
            else if (afterString == null)
            {
                // Removed code
                return string.Format(@"
/* {0}
{1}
{2}
*/
",
                header,
                WorkspacesResources.Removed_colon,
                beforeString);
            }
            else
            {
                // Changed code
                return string.Format(@"
/* {0}
{1}
{2}
{3}
{4}
*/
",
                header,
                WorkspacesResources.Before_colon,
                beforeString,
                WorkspacesResources.After_colon,
                afterString);
            }
        }
    }
}