using System;
using System.Reflection;

using DataLoader;
using Gamecraft.Wires;
using HarmonyLib;
using RobocraftX.Blocks;
using RobocraftX.Blocks.Scaling;
using RobocraftX.Character;
using RobocraftX.Common;
using RobocraftX.CR.MachineEditing;
using Svelto.ECS;
using Svelto.ECS.EntityStructs;
using Unity.Mathematics;
using UnityEngine;
using TechbloxModdingAPI.Players;
using RobocraftX.Rendering.GPUI;
using TechbloxModdingAPI.Engines;
using TechbloxModdingAPI.Utility;

namespace TechbloxModdingAPI.Blocks
{
    /// <summary>
    /// Engine which executes block placement actions
    /// </summary>
    public class PlacementEngine : IApiEngine
    {
        public bool IsInGame;

        public void Dispose()
        {
            IsInGame = false;
        }

        public void Ready()
        {
            IsInGame = true;
        }

        public EntitiesDB entitiesDB { get; set; }
        private static BlockEntityFactory _blockEntityFactory; //Injected from PlaceSingleBlockEngine

        public EntityInitializer PlaceBlock(BlockIDs block, float3 position, Player player, bool autoWire)
        { //It appears that only the non-uniform scale has any visible effect, but if that's not given here it will be set to the uniform one
            return BuildBlock((ushort) block, position, autoWire, (player ?? Player.LocalPlayer).Id);
        }

        private EntityInitializer BuildBlock(ushort block, float3 position, bool autoWire, uint playerId)
        {
            if (_blockEntityFactory == null)
                throw new BlockException("The factory is null.");
            uint resourceId = (uint) PrefabsID.GenerateResourceID(0, block);
            if (!PrefabsID.PrefabIDByResourceIDMap.ContainsKey(resourceId))
                throw new BlockException("Block with ID " + block + " not found!");
            //RobocraftX.CR.MachineEditing.PlaceSingleBlockEngine
            DBEntityStruct dbEntity = new DBEntityStruct {DBID = block};

            EntityInitializer structInitializer = _blockEntityFactory.Build(CommonExclusiveGroups.nextBlockEntityID, block); //The ghost block index is only used for triggers
            uint prefabId = PrefabsID.GetOrCreatePrefabID(block, (byte) BlockMaterial.SteelBodywork, 0, false);
            structInitializer.Init(new GFXPrefabEntityStructGPUI(prefabId));
            structInitializer.Init(new PhysicsPrefabEntityStruct(prefabId));
            structInitializer.Init(dbEntity);
            structInitializer.Init(new PositionEntityStruct {position = position});
            structInitializer.Init(new BlockPlacementInfoStruct()
            {
                loadedFromDisk = false,
                placedBy = playerId,
                triggerAutoWiring = autoWire && structInitializer.Has<BlockPortsStruct>()
            });

            foreach (var group in CharacterExclusiveGroups.AllCharacters)
            {
                EGID playerEGID = new EGID(playerId, group);
                if (!entitiesDB.TryQueryEntitiesAndIndex<PickedBlockExtraDataStruct>(playerEGID, out uint index,
                    out var array)) continue;
                ref PickedBlockExtraDataStruct pickedBlock = ref array[index];
                pickedBlock.placedBlockEntityID = structInitializer.EGID;
                pickedBlock.placedBlockWasAPickedBlock = false;
            }
            return structInitializer;
        }

        public string Name => "GamecraftModdingAPIPlacementGameEngine";

        public bool isRemovable => false;

        [HarmonyPatch]
        public class FactoryObtainerPatch
        {
            static void Postfix(BlockEntityFactory blockEntityFactory)
            {
                _blockEntityFactory = blockEntityFactory;
                Logging.MetaDebugLog("Block entity factory injected.");
            }

            static MethodBase TargetMethod(Harmony instance)
            {
                return AccessTools.TypeByName("RobocraftX.CR.MachineEditing.PlaceSingleBlockEngine").GetConstructors()[0];
            }
        }
    }
}