//-----------------------------------------------------------------------
// -----------------------------------------------------------------------
// file="PipelineMarshal"
// Project: StgSharp
// AuthorGroup: Nitload
// Copyright (c) Nitload. All rights reserved.
//     
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in all
// copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
// SOFTWARE.
//     
// -----------------------------------------------------------------------
// -----------------------------------------------------------------------
using System;
using System.Collections;
using System.Collections.Generic;
using System.Linq;
using System.Net.Http;
using System.Text;
using System.Threading.Tasks;

namespace StgSharp.PipeLine
{
    public static class PipelineMarshal
    {

        public static IEnumerable<PipelineNode> GetNodeSortedEnumeration(PipelineScheduler scheduler)
        {
            ArgumentNullException.ThrowIfNull(scheduler);
            return new PipelineNodeEnumerator(scheduler)
            {
                _count = scheduler._allNode.Count,
            };
        }

        private class PipelineNodeEnumerator : ICollection<PipelineNode>
        {

            private readonly List<List<PipelineNode>> _mt, _c;

            public int _count;

            public PipelineNodeEnumerator(PipelineScheduler scheduler)
            {
                if (!scheduler.TryGetAllNode(out _mt, out _c)) {
                    throw new InvalidOperationException("Binded scheduler is not sorted.");
                }
            }

            public bool IsReadOnly => true;

            public int Count => _count;

            public IEnumerator<PipelineNode> GetEnumerator()
            {
                for (int i = 1; i < _mt.Count; i++)
                {
                    foreach (PipelineNode node in _mt[i]) {
                        yield return node;
                    }
                    foreach (PipelineNode node in _c[i]) {
                        yield return node;
                    }
                }
            }

            void ICollection<PipelineNode>.Add(PipelineNode item)
            {
                throw new NotSupportedException();
            }

            void ICollection<PipelineNode>.Clear()
            {
                throw new NotSupportedException();
            }

            bool ICollection<PipelineNode>.Contains(PipelineNode item)
            {
                throw new NotSupportedException();
            }

            void ICollection<PipelineNode>.CopyTo(PipelineNode[] array, int arrayIndex)
            {
                throw new NotSupportedException();
            }

            bool ICollection<PipelineNode>.Remove(PipelineNode item)
            {
                throw new NotSupportedException();
            }

            IEnumerator IEnumerable.GetEnumerator()
            {
                return GetEnumerator();
            }

        }

    }
}