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

using RobocraftX;
using RobocraftX.Blocks;
using RobocraftX.Blocks.Ghost;
using RobocraftX.Common;
using RobocraftX.Multiplayer;
using RobocraftX.SimulationModeState;
using RobocraftX.UECS;
using Unity.Entities;
using Svelto.Context;
using Svelto.DataStructures;
using Svelto.ECS;
using Svelto.ECS.EntityStructs;
using Unity.Transforms;
using Unity.Mathematics;
using UnityEngine;
using Gamecraft.Wires;

using GamecraftModdingAPI.Utility;

namespace GamecraftModdingAPI.Blocks
{
    /// <summary>
    /// Engine which executes signal actions
    /// </summary>
    public class SignalEngine : IApiEngine
    {
        public string Name { get; } = "GamecraftModdingAPISignalGameEngine";

        public EntitiesDB entitiesDB { set; private get; }

        public bool IsInGame = false;

        public void Dispose()
        {
            IsInGame = false;
        }

        public void Ready()
        {
            IsInGame = true;
        }

        // implementations for Signal static class

        public bool SetSignal(EGID blockID, float signal, out uint signalID, bool input = true)
        {
            signalID = GetSignalIDs(blockID, input)[0];
            return SetSignal(signalID, signal);
        }

        public bool SetSignal(uint signalID, float signal, bool input = true)
        {
			ExclusiveGroup group = input ? NamedExclusiveGroup<InputPortsGroup>.Group : NamedExclusiveGroup<OutputPortsGroup>.Group;
			if (entitiesDB.Exists<PortEntityStruct>(signalID, group))
            {
                entitiesDB.QueryEntity<PortEntityStruct>(signalID, group).value = signal;
				return true;
            }
            return false;
        }

        public float AddSignal(EGID blockID, float signal, out uint signalID, bool clamp = true, bool input = true)
        {
            signalID = GetSignalIDs(blockID, input)[0];
            return AddSignal(signalID, signal, clamp, input);
        }

        public float AddSignal(uint signalID, float signal, bool clamp = true, bool input = true)
        {
			ExclusiveGroup group = input ? NamedExclusiveGroup<InputPortsGroup>.Group : NamedExclusiveGroup<OutputPortsGroup>.Group;
			if (entitiesDB.Exists<PortEntityStruct>(signalID, group))
			{
				ref PortEntityStruct pes = ref entitiesDB.QueryEntity<PortEntityStruct>(signalID, group);
				pes.value += signal;
				if (clamp)
				{
					if (pes.value > Signals.POSITIVE_HIGH)
					{
						pes.value = Signals.POSITIVE_HIGH;
					}
					else if (pes.value < Signals.NEGATIVE_HIGH)
					{
						pes.value = Signals.NEGATIVE_HIGH;
					}
					return pes.value;
				}
			}
            return signal;
        }

        public float GetSignal(EGID blockID, out uint signalID, bool input = true)
        {
			signalID = GetSignalIDs(blockID, input)[0];
            return GetSignal(signalID, input);
        }

        public float GetSignal(uint signalID, bool input = true)
        {
			ExclusiveGroup group = input ? NamedExclusiveGroup<InputPortsGroup>.Group : NamedExclusiveGroup<OutputPortsGroup>.Group;
			if (entitiesDB.Exists<PortEntityStruct>(signalID, group))
            {
				return entitiesDB.QueryEntity<PortEntityStruct>(signalID, group).value;
            }
            return 0f;
        }

        public uint[] GetSignalIDs(EGID blockID, bool input = true)
		{
			ref BlockPortsStruct bps = ref entitiesDB.QueryEntity<BlockPortsStruct>(blockID);
			uint[] signals;
			if (input) {
				signals = new uint[bps.inputCount];
				for (uint i = 0u; i < bps.inputCount; i++)
				{
					signals[i] = bps.firstInputID + i;
				}
			} else {
				signals = new uint[bps.outputCount];
                for (uint i = 0u; i < bps.outputCount; i++)
                {
                    signals[i] = bps.firstOutputID + i;
                }
			}
			return signals;
		}

        public EGID[] GetElectricBlocks()
		{
			uint count = entitiesDB.Count<BlockPortsStruct>(BlockIdentifiers.OWNED_BLOCKS) + entitiesDB.Count<BlockPortsStruct>(BlockIdentifiers.FUNCTIONAL_BLOCK_PARTS);
            uint i = 0;
            EGID[] res = new EGID[count];
			foreach (ref BlockPortsStruct s in entitiesDB.QueryEntities<BlockPortsStruct>(BlockIdentifiers.OWNED_BLOCKS))
            {
                res[i] = s.ID;
                i++;
            }
			foreach (ref BlockPortsStruct s in entitiesDB.QueryEntities<BlockPortsStruct>(BlockIdentifiers.FUNCTIONAL_BLOCK_PARTS))
            {
                res[i] = s.ID;
                i++;
            }
            return res;
        }

        public bool IsSimulationMode()
        {
            return GamecraftModdingAPI.Utility.GameState.IsSimulationMode();
        }
    }
}