//-----------------------------------------------------------------------
//-----------------------------------------------------------------------
//     file="ViewBase.cs"
//     Project: StgSharp
//     AuthorGroup: Nitload Space
//     Copyright (c) Nitload Space. 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.Logic;
using StgSharp.Math;
using StgSharp.MVVM.ViewModel;

using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.Linq;
using System.Numerics;
using System.Reflection;
using System.Runtime.CompilerServices;
using System.Runtime.InteropServices;
using System.Security.Cryptography;
using System.Text;
using System.Threading;

namespace StgSharp.MVVM.View
{
    /// <summary>
    /// ViewBase is the base type for all view types, providing context binding and control element binding.
    /// A complete view should contain one complete <see cref="ViewDesigner{T}"/>, <see cref="ViewRender{TView}"/>, and <see cref="ViewResponder"/>,
    /// which provide layout descriptions of control elements, user responses, and rendering implementations in the view.
    /// Data between instances of <see cref="ViewDesigner{T}"/>, <see cref="ViewRender{TView}"/>, and <see cref="ViewResponder{T}"/> is shared through <see cref="ViewBase"/>.
    /// </summary>

    public abstract unsafe partial class ViewBase
    {

        private (int x, int y, int z) unitCubeSize;

        private GetDataBindingEntryDelegate getDataBindingEntry;

        private int usedFrame = 0;
        private IViewDesigner<ViewBase> _design;
        private IViewRender<ViewBase> _render;
        private IViewResponder<ViewBase> _responder;
        private TimeSpanProvider time;

        private ViewPort context;

        private delegate bool GetDataBindingEntryDelegate(string name, out DataBindingEntry entry);

        public DataBindingEntry this[string name]
        {
            get
            {
                if (TryGetObjectReference(name, out DataBindingEntry entry))
                {
                    return entry;
                }
                if (getDataBindingEntry(name, out entry))
                {
                    return entry;
                }
                throw new KeyNotFoundException();
            }
        }

        public (int x, int y, int z) UnitCubeSize
        {
            get => unitCubeSize;
        }

        public bool Activated { get; internal set; }

        public int Height
        {
            get => context.Height;
            private set { context.Height = value; }
        }

        public int Width
        {
            get => context.Width;
            private set { context.Width = value; }
        }

        public IntPtr Monitor => context.Monitor;

        public IntPtr ViewHandle => context.ViewPortID;

        public IViewDesigner<ViewBase> Designer
        {
            get => _design;
            protected set => _design = value;
        }

        public string ContextName => context.Name;

        public string SelfName { get; set; }

        public ViewPort Port
        {
            get => context;
        }

        internal TimeSpanProvider TimeProvider
        {
            get => time;
        }

        protected IViewRender<ViewBase> Render
        {
            get => _render;
            set => _render = value;
        }

        protected IViewResponder<ViewBase> Responder
        {
            get => _responder;
            set => _responder = value;
        }

        public abstract void CustomizedInitialize(ViewModelBase viewModelBinding);

        /// <summary>
        /// Get the status of a certain key on the keyboard.
        /// </summary>
        /// <param name="key"></param>
        /// <returns><see cref="KeyStatus"/> representing if a key is pressed or released.</returns>
        [MethodImpl(MethodImplOptions.AggressiveInlining)]
        public KeyStatus GetKeyStatus(KeyboardKey key)
        {
            return InternalIO.glfwGetKey(context.ViewPortID, (int)key);
        }

        public void InternalInitialize(string name,(int,int,int) cubeSize, ViewModelBase viewModelBinding)
        {
            SelfName = name;
            unitCubeSize = cubeSize;
            getDataBindingEntry = viewModelBinding.TryGetObjectReference;
            context = viewModelBinding.ViewPortBinding;
            time = viewModelBinding.frameTimeProvider;

            CustomizedInitialize(viewModelBinding);
        }

        public abstract bool TryGetObjectReference(string name, out DataBindingEntry entry);

        public void Use()
        {
            if (usedFrame == 0)
            {
                if (!ValidateInitialization())
                {
                    throw new InvalidOperationException("This view is not correctly initialized before rendering.");
                } 
            }
            Show();
        }

        public bool ValidateInitialization()
        {
            return (_design != null) && (_render != null) && (getDataBindingEntry != null) && (_responder != null)
                && (_design.ValidateInitializing()) && (_responder.ValidateInitializing()) && (_render.ValidateInitializing())
                ;
        }

        protected internal abstract void Show();

    }

}