//-----------------------------------------------------------------------
// -----------------------------------------------------------------------
// file="ViewRender"
// 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 StgSharp.Graphics;

using StgSharp.HighPerformance;

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

namespace StgSharp.MVVM
{
    public abstract partial class ViewBase
    {

        protected internal interface IViewRender<out TView> where TView: ViewBase
        {

            RenderStream this[DataLabel renderName] { get; }

            void CustomizedInitialize();

            IEnumerator<ViewPort> GetEnumerator();

            void Initialize();

            bool ValidateInitializing();

        }

        protected abstract class ViewRender<TView> : IViewRender<TView> where TView: ViewBase
        {

            protected ViewRender(TView binding)
            {
                _binding = binding;
                _render = new Dictionary<DataLabel, RenderStream>();
            }

            public RenderStream this[DataLabel renderName]
            {
                get => _render.TryGetValue(renderName, out RenderStream stream) ? stream : (null!);
                protected set
                {
                    if (_render.ContainsKey(renderName))
                    {
                        _render[renderName] = value;
                    } else
                    {
                        _render.Add(renderName, value);
                    }
                }
            }

            public TView Binding => _binding;

            protected ViewPort ContextBinding => _binding.context;

            protected ViewDesigner<TView> Design => (_binding.Designer as ViewDesigner<TView>)!;

            protected Dictionary<DataLabel, RenderStream> Render
            {
                get => _render;
            }

            protected ViewResponder<TView> Responder => (_binding.Responder as ViewResponder<TView>)!;

            public T CreateRenderStream<T>() where T: RenderStream, new()
            {
                T ret = new T();
                ret.Initialize(_binding.context, Binding.TimeProvider);
                return ret;
            }

            public T CreateRenderStream<T>(ViewPort vp) where T: RenderStream, new()
            {
                T ret = new T();
                ret.Initialize(vp, Binding.TimeProvider);
                return ret;
            }

            public abstract void CustomizedInitialize();

            public IEnumerator<ViewPort> GetEnumerator()
            {
                foreach (RenderStream item in Render.Values) {
                    yield return item.BindedViewPortContext;
                }
            }

            public void Initialize()
            {
                CustomizedInitialize();
            }

            public abstract bool ValidateInitializing();

            #pragma warning disable CS8618 
            private Dictionary<DataLabel, RenderStream> _render;
            private TView _binding;
#pragma warning restore CS8618
        }

    }
}