// 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.Composition;
using System.Diagnostics.CodeAnalysis;
using Microsoft.CodeAnalysis.CodeFixes;
using Microsoft.CodeAnalysis.CSharp.Formatting;
using Microsoft.CodeAnalysis.CSharp.LanguageService;
using Microsoft.CodeAnalysis.CSharp.Syntax;
using Microsoft.CodeAnalysis.Formatting;
using Microsoft.CodeAnalysis.Formatting.Rules;
using Microsoft.CodeAnalysis.LanguageService;
using Microsoft.CodeAnalysis.Operations;
using Microsoft.CodeAnalysis.Simplification;
using Microsoft.CodeAnalysis.UseConditionalExpression;

namespace Microsoft.CodeAnalysis.CSharp.UseConditionalExpression
{
    [ExportCodeFixProvider(LanguageNames.CSharp, Name = PredefinedCodeFixProviderNames.UseConditionalExpressionForAssignment), Shared]
    internal partial class CSharpUseConditionalExpressionForAssignmentCodeFixProvider
        : AbstractUseConditionalExpressionForAssignmentCodeFixProvider<
            StatementSyntax, IfStatementSyntax, LocalDeclarationStatementSyntax, VariableDeclaratorSyntax, ExpressionSyntax, ConditionalExpressionSyntax>
    {
        [ImportingConstructor]
        [SuppressMessage("RoslynDiagnosticsReliability", "RS0033:Importing constructor should be [Obsolete]", Justification = "Used in test code: https://github.com/dotnet/roslyn/issues/42814")]
        public CSharpUseConditionalExpressionForAssignmentCodeFixProvider()
        {
        }

        protected override ISyntaxFacts SyntaxFacts
            => CSharpSyntaxFacts.Instance;

        protected override AbstractFormattingRule GetMultiLineFormattingRule()
            => MultiLineConditionalExpressionFormattingRule.Instance;

        protected override VariableDeclaratorSyntax WithInitializer(VariableDeclaratorSyntax variable, ExpressionSyntax value)
            => variable.WithInitializer(SyntaxFactory.EqualsValueClause(value));

        protected override VariableDeclaratorSyntax GetDeclaratorSyntax(IVariableDeclaratorOperation declarator)
            => (VariableDeclaratorSyntax)declarator.Syntax;

        protected override LocalDeclarationStatementSyntax AddSimplificationToType(LocalDeclarationStatementSyntax statement)
            => statement.WithDeclaration(statement.Declaration.WithType(
                statement.Declaration.Type.WithAdditionalAnnotations(Simplifier.Annotation)));

        protected override StatementSyntax WrapWithBlockIfAppropriate(
            IfStatementSyntax ifStatement, StatementSyntax statement)
        {
            if (ifStatement.Parent is ElseClauseSyntax &&
                ifStatement.Statement is BlockSyntax block)
            {
                return block.WithStatements(SyntaxFactory.SingletonList(statement))
                            .WithAdditionalAnnotations(Formatter.Annotation);
            }

            return statement;
        }

        protected override ExpressionSyntax ConvertToExpression(IThrowOperation throwOperation)
            => CSharpUseConditionalExpressionHelpers.ConvertToExpression(throwOperation);

        protected override ISyntaxFormatting GetSyntaxFormatting()
            => CSharpSyntaxFormatting.Instance;
    }
}
