//-----------------------------------------------------------------------
//-----------------------------------------------------------------------
//     file="BlueprintNode.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 StgSharpDebug.Logic;

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

namespace StgSharp.Logic
{
    public delegate void BlueprintNodeAction(
        in Dictionary<string, BlueprintPipeline> inpput,
        in Dictionary<string, BlueprintPipeline> output);

    public abstract class BlueprintNode:IComparable<BlueprintNode>
    {

        private Blueprint local;
        private BlueprintNodeAction mainOperation;

        private bool levelAvailabel, nativeRequested;

        private Dictionary<string, BlueprintPipeline> inputInterfaces;
        private Dictionary<string, BlueprintPipeline> outputInterface;
        private int level;
        private string name;

        protected BlueprintNode(string name, BlueprintNodeAction operation)
        {
            this.levelAvailabel = false;
            this.name = name;
            mainOperation = operation;
            inputInterfaces = new Dictionary<string, BlueprintPipeline>();
            outputInterface = new Dictionary<string, BlueprintPipeline>();
        }

        internal BlueprintNode(string name, bool isNative)
        {
            this.levelAvailabel = false;
            this.name = name;
            nativeRequested = isNative;
            inputInterfaces = new Dictionary<string, BlueprintPipeline>();
            outputInterface = new Dictionary<string, BlueprintPipeline>();
        }

        public bool IsNative => nativeRequested;

        public int Level
        {
            get
            {
                if (levelAvailabel)
                {
                    return level;
                }
                level = 0;
                foreach (var item in inputInterfaces)
                {
                    if (level <= item.Value.Level)
                    {
                        level = item.Value.Level;
                    }
                }
                level += 1;
                return level;
            }
        }

        internal Dictionary<string, BlueprintPipeline> InputInterfaces => inputInterfaces;
        internal Dictionary<string, BlueprintPipeline> OutputInterface => outputInterface;


        public void AddAfter(
            BlueprintNode former,
            string formerOutputPortName,
            string thisInputPortName)
        {
            this.levelAvailabel = false;
            BlueprintPipeline pipeline = new BlueprintPipeline(former,this);
            
        }

        public void Run()
        {
            try
            {
                foreach (var item in inputInterfaces)
                {
                    item.Value.WaitForStart();
                }
                mainOperation(in inputInterfaces, in outputInterface);
            }
            catch (Exception)
            {
                throw;
            }
        }

        int IComparable<BlueprintNode>.CompareTo(BlueprintNode other)
        {
            return this.Level.CompareTo(other.Level);
        }
    }//--------------------------------- end of class -----------------------------

    public class BlueprintNodeRunException : Exception
    {
        private Exception realException;

        public BlueprintNodeRunException(string message, Exception ex) : base(message, ex)
        {
        }

        public BlueprintNodeRunException(Exception ex):base("",ex)
        {
        }
    }

    public class BlueprintPipeline
    {

        private BlueprintNode former;
        private BlueprintNode after;
        private BlueprintPipelineArgs args;
        private SemaphoreSlim formerCompleteSemaphore;

        public BlueprintPipeline(BlueprintNode former, BlueprintNode after)
        {
            this.former = former;
            this.after = after;
            formerCompleteSemaphore = new SemaphoreSlim(initialCount: 0, maxCount: 1);
        }

        public BlueprintNode Former => former;

        public BlueprintNode After => after;

        public int Level => former.Level;

        public void CompleteAndWriteData(BlueprintPipelineArgs args)
        {
            formerCompleteSemaphore.Release();
            this.args = args;
        }

        public void WaitForStart()
        {
            formerCompleteSemaphore.Release();
        }

    }

    public abstract class BlueprintPipelineArgs
    {
    }
}