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

using System.Collections;
using System.Collections.Generic;

namespace Microsoft.AspNetCore.Razor.Language;

public abstract partial class TagHelperCollection
{
    public sealed partial class Builder
    {
        public ref struct Enumerator(Builder builder)
        {
            private int _index = -1;

            public readonly TagHelperDescriptor Current => builder[_index];

            public bool MoveNext()
            {
                if (_index < builder.Count - 1)
                {
                    _index++;
                    return true;
                }

                return false;
            }

            public void Reset()
            {
                _index = -1;
            }

            public void Dispose()
            {
                Reset();
            }
        }

        private sealed class EnumeratorImpl(Builder builder) : IEnumerator<TagHelperDescriptor>
        {
            private int _index = -1;

            public TagHelperDescriptor Current => builder[_index];

            object IEnumerator.Current => Current;

            public bool MoveNext()
            {
                if (_index < builder.Count - 1)
                {
                    _index++;
                    return true;
                }

                return false;
            }

            public void Reset()
            {
                _index = -1;
            }

            public void Dispose()
            {
                _index = -1;
            }
        }
    }
}