using StgSharp.Graphics;

using System;
using System.Collections.Generic;
using System.Text;
using System.Threading;

namespace StgSharp.Logic
{
    public abstract partial class ViewModelBase
    {
        private View _nextView, _currentView;

        protected View CurrentView 
        {
            get => _currentView;
            set => _nextView = value;
        }

        protected void UseViewInNextFrame(string name)
        {
            if (allView.TryGetValue(name, out View v))
            {
                throw new KeyNotFoundException($"Cannot find View named {name} " +
                    $"in current View Model of {this.GetType().FullName}");
            }
            CurrentView = v;
        }

        /// <summary>
        /// CustomizeInit this form and render it on screen, and respond with operation
        /// </summary>
        public unsafe void Show()
        {
            CustomizeInitialize();
            //BuildGlobalKeyControl();
            while(0 == InternalIO.glfwWindowShouldClose(this.viewPortDisplay.ViewPortID))
            {
                viewPortDisplay.FlushSize();
                CurrentView.Use();
                RenderStream.PollEvents();
                frameTimeProvider.WaitNextSpan();
                Interlocked.Add(ref _frameCount, 1);
            }
        }

        private unsafe void PrivateShow()
        {
            if(0 == InternalIO.glfwWindowShouldClose(this.viewPortDisplay.ViewPortID))
            {
                CurrentView.Use();
                RenderStream.PollEvents();
            }
        }

    }
}