// 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.Threading;
using Microsoft.CodeAnalysis.CSharp.LanguageService;
using Microsoft.CodeAnalysis.Diagnostics;
using Microsoft.CodeAnalysis.Formatting;
using Microsoft.CodeAnalysis.LanguageService;
 
namespace Microsoft.CodeAnalysis.CSharp.Formatting
{
    internal class CSharpStructuredTriviaFormatEngine : AbstractFormatEngine
    {
        public static IFormattingResult Format(
            SyntaxTrivia trivia,
            int initialColumn,
            SyntaxFormattingOptions options,
            ChainedFormattingRules formattingRules,
            CancellationToken cancellationToken)
        {
            var root = trivia.GetStructure() ?? throw new ArgumentException();
            var formatter = new CSharpStructuredTriviaFormatEngine(trivia, initialColumn, options, formattingRules, root.GetFirstToken(includeZeroWidth: true), root.GetLastToken(includeZeroWidth: true));
            return formatter.Format(cancellationToken);
        }
 
        private CSharpStructuredTriviaFormatEngine(
            SyntaxTrivia trivia,
            int initialColumn,
            SyntaxFormattingOptions options,
            ChainedFormattingRules formattingRules,
            SyntaxToken startToken,
            SyntaxToken endToken)
            : base(TreeData.Create(trivia, initialColumn),
                   options,
                   formattingRules,
                   startToken,
                   endToken)
        {
        }
 
        internal override IHeaderFacts HeaderFacts => CSharpHeaderFacts.Instance;
 
        protected override AbstractTriviaDataFactory CreateTriviaFactory()
            => new TriviaDataFactory(this.TreeData, this.Options);
 
        protected override FormattingContext CreateFormattingContext(TokenStream tokenStream, CancellationToken cancellationToken)
            => new(this, tokenStream);
 
        protected override NodeOperations CreateNodeOperations(CancellationToken cancellationToken)
        {
            // ignore all node operations for structured trivia since it is not possible for this to have any impact currently.
            return NodeOperations.Empty;
        }
 
        protected override AbstractFormattingResult CreateFormattingResult(TokenStream tokenStream)
            => new FormattingResult(this.TreeData, tokenStream, this.SpanToFormat);
    }
}