// 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 Microsoft.CodeAnalysis.Symbols;
using Microsoft.CodeAnalysis.Text;
using Cci = Microsoft.Cci;

namespace Microsoft.CodeAnalysis.CodeGen
{
    /// <summary>
    /// An expression that represents a (name, value) pair and that is typically used in method calls, custom attributes and object initializers.
    /// </summary>
    internal sealed class MetadataNamedArgument : Cci.IMetadataNamedArgument
    {
        private readonly ISymbolInternal _entity;
        private readonly Cci.ITypeReference _type;
        private readonly Cci.IMetadataExpression _value;

        public MetadataNamedArgument(ISymbolInternal entity, Cci.ITypeReference type, Cci.IMetadataExpression value)
        {
            // entity must be one of INamedEntity or IFieldDefinition or IPropertyDefinition
            _entity = entity;
            _type = type;
            _value = value;
        }

        /// <summary>
        /// The name of the parameter or property or field that corresponds to the argument.
        /// </summary>
        string Cci.IMetadataNamedArgument.ArgumentName => _entity.Name;

        /// <summary>
        /// The value of the argument.
        /// </summary>
        Cci.IMetadataExpression Cci.IMetadataNamedArgument.ArgumentValue => _value;

        /// <summary>
        /// True if the named argument provides the value of a field.
        /// </summary>
        bool Cci.IMetadataNamedArgument.IsField => _entity.Kind == SymbolKind.Field;

        void Cci.IMetadataExpression.Dispatch(Cci.MetadataVisitor visitor)
        {
            visitor.Visit(this);
        }

        Cci.ITypeReference Cci.IMetadataExpression.Type => _type;
    }
}