// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.

using System;
using System.Text;
using Microsoft.Extensions.Internal;

namespace Microsoft.AspNetCore.Razor.Language.Legacy
{
    internal class DirectiveTokenChunkGenerator : SpanChunkGenerator
    {
        private static readonly Type Type = typeof(DirectiveTokenChunkGenerator);

        public DirectiveTokenChunkGenerator(DirectiveTokenDescriptor tokenDescriptor)
        {
            Descriptor = tokenDescriptor;
        }

        public DirectiveTokenDescriptor Descriptor { get; }

        public override bool Equals(object obj)
        {
            var other = obj as DirectiveTokenChunkGenerator;
            return base.Equals(other) &&
                DirectiveTokenDescriptorComparer.Default.Equals(Descriptor, other.Descriptor);
        }

        public override int GetHashCode()
        {
            var combiner = HashCodeCombiner.Start();
            combiner.Add(base.GetHashCode());
            combiner.Add(Type);

            return combiner.CombinedHash;
        }

        public override string ToString()
        {
            var builder = new StringBuilder("DirectiveToken {");
            builder.Append(Descriptor.Name);
            builder.Append(';');
            builder.Append(Descriptor.Kind);
            builder.Append(";Opt:");
            builder.Append(Descriptor.Optional);
            builder.Append('}');

            return builder.ToString();
        }
    }
}
