//-----------------------------------------------------------------------
//-----------------------------------------------------------------------
//     file="Blueprint.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;


using System;
using System.Collections.Generic;
using System.Linq;
using System.Linq.Expressions;
using System.Reflection;
using System.Runtime.CompilerServices;
using System.Runtime.InteropServices;
using System.Text;
using System.Threading;
using System.Threading.Tasks;
using System.Xml.Serialization;

namespace StgSharp.BluePrint
{
    /// <summary>
    /// A sets of complex logic designed for running in multi threads environment.
    /// Warning: do not run a <see cref="Blueprint"/> instance in multi threads more than once.
    /// 
    /// </summary>
    public partial class Blueprint : IConvertableToBlueprintNode
    {

        private BeginningNode beginNode;
        private Dictionary<string, BlueprintNode> allNode;
        private EndingNode endNode;

        private Func<bool> terminate;
        private List<BlueprintNode> globalNodeList;
        private List<BlueprintNode> nativeNodeList;

        private SemaphoreSlim runningStat;

        internal int currentGlobalNodeIndex;
        internal int currentNativeNodeIndex;

        public Blueprint()
        {
            allNode = new Dictionary<string, BlueprintNode>();
            globalNodeList = new List<BlueprintNode>();
            nativeNodeList = new List<BlueprintNode>();
            runningStat = new SemaphoreSlim(1, 1);
            beginNode = new BeginningNode(this);
            endNode = new EndingNode(this);
        }

        public BlueprintNode BeginLayer => beginNode;
        public BlueprintNode EndLayer => endNode;

        public bool IsRunning
        {
            get => runningStat.CurrentCount == 0;
        }

        /**/
        internal Func<bool> ShouldClose
        {
            get => terminate;
            set => terminate = value;
        }

        internal SemaphoreSlim RunningStat
        {
            get => runningStat;
        }
        /**/

        public void AddNode(BlueprintNode node, bool isNative)
        {
            _ = node ?? throw new ArgumentNullException(nameof(node));
            node.IsNative = isNative;
            allNode.Add(node.Name, node);
        }

        public void ExecuteMain(in Dictionary<string, BlueprintPipeline> input,
                    in Dictionary<string, BlueprintPipeline> output)
        {
            BlueprintRunner.Run(this, () => true);
        }

        [MethodImpl(MethodImplOptions.AggressiveInlining)]
        public (string name, BlueprintPipelineArgs arg)[] GetOutput()
        {
            return endNode.OutputData;
        }

        public void Init()
        {
            foreach (KeyValuePair<string, BlueprintNode> item in allNode)
            {
                if (item.Value.IsNative)
                {
                    nativeNodeList.Add(item.Value);
                }
                else
                {
                    globalNodeList.Add(item.Value);
                }
            }
            nativeNodeList.Sort();
            globalNodeList.Sort();
        }

        [MethodImpl(MethodImplOptions.AggressiveInlining)]
        public void SetInput(params (string name, BlueprintPipelineArgs arg)[] parameters)
        {
            beginNode.InputData = parameters;
        }

        public void Terminate()
        {
            Interlocked.Exchange(ref currentGlobalNodeIndex, int.MaxValue);
            Interlocked.Exchange(ref currentNativeNodeIndex, int.MaxValue);
        }

        internal bool RequestNexGlobalNode(out BlueprintNode node)
        {
            if (currentGlobalNodeIndex < globalNodeList.Count)
            {
                node = globalNodeList[currentGlobalNodeIndex];
                Interlocked.Increment(ref currentGlobalNodeIndex);
                return true;
            }
            node = default!;
            return false;
        }

        internal bool RequestNextNativeNode(out BlueprintNode node)
        {

            if (currentNativeNodeIndex < nativeNodeList.Count)
            {
                node = nativeNodeList[currentNativeNodeIndex];
                Interlocked.Increment(ref currentNativeNodeIndex);
                return true;
            }
            node = default!;
            return false;
        }

        string[] IConvertableToBlueprintNode.InputInterfacesName
        {
            get { return beginNode.OutputInterfaces.Select(p => p.Key).ToArray(); }
        }

        string[] IConvertableToBlueprintNode.OutputInterfacesName
        {
            get { return beginNode.OutputInterfaces.Select(p => p.Key).ToArray(); }
        }

    }

}