// 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.Collections.Generic;
using System.Collections.Immutable;
using System.Linq;
using System.Threading;
using Microsoft.CodeAnalysis.CodeGeneration;
using Microsoft.CodeAnalysis.PooledObjects;
 
namespace Microsoft.CodeAnalysis.Shared.Extensions
{
    internal static partial class IParameterSymbolExtensions
    {
        public static IParameterSymbol RenameParameter(this IParameterSymbol parameter, string parameterName)
        {
            return parameter.Name == parameterName
                ? parameter
                : CodeGenerationSymbolFactory.CreateParameterSymbol(
                        parameter.GetAttributes(),
                        parameter.RefKind,
                        parameter.IsParams,
                        parameter.Type,
                        parameterName,
                        parameter.IsOptional,
                        parameter.HasExplicitDefaultValue,
                        parameter.HasExplicitDefaultValue ? parameter.ExplicitDefaultValue : null);
        }
 
        public static IParameterSymbol WithAttributes(this IParameterSymbol parameter, ImmutableArray<AttributeData> attributes)
        {
            return parameter.GetAttributes() == attributes
                ? parameter
                : CodeGenerationSymbolFactory.CreateParameterSymbol(
                        attributes,
                        parameter.RefKind,
                        parameter.IsParams,
                        parameter.Type,
                        parameter.Name,
                        parameter.IsOptional,
                        parameter.HasExplicitDefaultValue,
                        parameter.HasExplicitDefaultValue ? parameter.ExplicitDefaultValue : null);
        }
 
        public static ImmutableArray<IParameterSymbol> RenameParameters(this IList<IParameterSymbol> parameters, ImmutableArray<string> parameterNames)
        {
            using var _ = ArrayBuilder<IParameterSymbol>.GetInstance(parameters.Count, out var result);
            for (var i = 0; i < parameterNames.Length; i++)
                result.Add(parameters[i].RenameParameter(parameterNames[i]));
 
            return result.ToImmutableAndClear();
        }
    }
}