// 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.Composition;
using Microsoft.CodeAnalysis.CSharp.Syntax;
using Microsoft.CodeAnalysis.Editing;
using Microsoft.CodeAnalysis.Host.Mef;
using Microsoft.CodeAnalysis.Snippets;
using Microsoft.CodeAnalysis.Snippets.SnippetProviders;
using Roslyn.Utilities;

namespace Microsoft.CodeAnalysis.CSharp.Snippets;

[ExportSnippetProvider(nameof(ISnippetProvider), LanguageNames.CSharp), Shared]
[method: ImportingConstructor]
[method: Obsolete(MefConstruction.ImportingConstructorMessage, error: true)]
internal sealed class CSharpForLoopSnippetProvider() : AbstractCSharpForLoopSnippetProvider
{
    public override string Identifier => CSharpSnippetIdentifiers.For;

    public override string Description => CSharpFeaturesResources.for_loop;

    protected override SyntaxKind ConditionKind => SyntaxKind.LessThanExpression;

    protected override SyntaxKind IncrementorKind => SyntaxKind.PostIncrementExpression;

    protected override ExpressionSyntax GenerateInitializerValue(SyntaxGenerator generator, SyntaxNode? inlineExpression)
        => (ExpressionSyntax)generator.LiteralExpression(0);

    protected override ExpressionSyntax GenerateRightSideOfCondition(SyntaxGenerator generator, SyntaxNode? inlineExpression)
        => (ExpressionSyntax)(inlineExpression ?? generator.IdentifierName("length"));

    protected override void AddSpecificPlaceholders(MultiDictionary<string, int> placeholderBuilder, ExpressionSyntax initializer, ExpressionSyntax rightOfCondition)
    {
        if (!ConstructedFromInlineExpression)
            placeholderBuilder.Add(rightOfCondition.ToString(), rightOfCondition.SpanStart);
    }
}