// 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.Collections.Generic;
using Microsoft.CodeAnalysis.Diagnostics;
using Microsoft.CodeAnalysis.Formatting;
using Microsoft.CodeAnalysis.Formatting.Rules;
using Microsoft.CodeAnalysis.Options;

namespace Microsoft.CodeAnalysis.CSharp.Formatting
{
    internal sealed class IndentUserSettingsFormattingRule : BaseFormattingRule
    {
        private readonly CSharpSyntaxFormattingOptions _options;

        public IndentUserSettingsFormattingRule()
            : this(CSharpSyntaxFormattingOptions.Default)
        {
        }

        private IndentUserSettingsFormattingRule(CSharpSyntaxFormattingOptions options)
        {
            _options = options;
        }

        public override AbstractFormattingRule WithOptions(SyntaxFormattingOptions options)
        {
            var newOptions = options as CSharpSyntaxFormattingOptions ?? CSharpSyntaxFormattingOptions.Default;

            if (_options.Indentation.HasFlag(IndentationPlacement.Braces) == newOptions.Indentation.HasFlag(IndentationPlacement.Braces))
            {
                return this;
            }

            return new IndentUserSettingsFormattingRule(newOptions);
        }

        public override void AddIndentBlockOperations(List<IndentBlockOperation> list, SyntaxNode node, in NextIndentBlockOperationAction nextOperation)
        {
            nextOperation.Invoke();

            var bracePair = node.GetBracePair();

            // don't put block indentation operation if the block only contains lambda expression body block
            if (node.IsLambdaBodyBlock() || !bracePair.IsValidBracketOrBracePair())
            {
                return;
            }

            if (_options.Indentation.HasFlag(IndentationPlacement.Braces))
            {
                AddIndentBlockOperation(list, bracePair.openBrace, bracePair.openBrace, bracePair.openBrace.Span);
                AddIndentBlockOperation(list, bracePair.closeBrace, bracePair.closeBrace, bracePair.closeBrace.Span);
            }
        }
    }
}
