using System;
using System.Collections;
using System.Collections.Concurrent;
using System.Collections.Generic;
using System.Threading;
using BITKit;
using BITKit.Entities;
using BITKit.StateMachine;
using BITKit.Tween;
using BITKit.UX.Hotkey;
using BITKit.WorldNode;
using Cysharp.Threading.Tasks;
using Microsoft.Extensions.DependencyInjection;
using Microsoft.Extensions.Logging;
using Net.Project.B.Interaction;
using UnityEngine;

namespace Net.Project.B.WorldNode
{
    public class UnityElevatorService:IDisposable
    {
        public sealed class ElevatorData
        {
            public int ElevatorId;
            public Rigidbody Rigidbody;
            public int ElevatorButtonId;
            public readonly Dictionary<int, int> ButtonToFloor = new();
            public readonly Dictionary<int, Transform> Floors = new();
        }
        public abstract class ElevatorState:StateAsync
        {
      
        }
        
        public sealed class IdleState:ElevatorState
        {
            
        }
        public sealed class TransportingState:ElevatorState
        {
            
        }
        public sealed class FaultState:ElevatorState
        {
            
        }

        private readonly ILogger<UnityElevatorService> _logger;
        private readonly IEntitiesService _entitiesService;
        private readonly Dictionary<int, UnityElevatorNode> _elevatorNodes=new();
        private readonly Dictionary<int, ElevatorData> _elevatorData = new();
        private readonly Dictionary<int,int> _buttonToElevator = new();
        private readonly Dictionary<int, CancellationTokenSource> _cts = new();
        private readonly IWorldInteractionService _interactionService;
        private readonly IFixedTicker _fixedTicker;
        private readonly IUXHotKey _uxHotKey;
        
        public UnityElevatorService(IFixedTicker fixedTicker, IWorldInteractionService interactionService, IEntitiesService entitiesService, IUXHotKey uxHotKey, ILogger<UnityElevatorService> logger)
        {
            _fixedTicker = fixedTicker;
            _interactionService = interactionService;
            _entitiesService = entitiesService;
            _uxHotKey = uxHotKey;
            _logger = logger;
            _interactionService.OnInteraction+=OnInteraction;

            _entitiesService.OnAdd += OnNodeRegistered;
            _entitiesService.OnRemove += OnRemove;
        }

        private void OnRemove(IEntity obj)
        {
            if (!_cts.TryGetValue(obj.Id, out var cts)) return;
            cts.Cancel();
            cts.Dispose();
        }

        private async void OnInteraction(object arg1, IWorldInteractable arg2, WorldInteractionProcess arg3, object arg4)
        {
            if(arg3 is not (WorldInteractionProcess.Performed or WorldInteractionProcess.System))return;
            if(_buttonToElevator.TryGetValue(arg2.Id,out var elevatorId) is false)return;
            if(_elevatorData.TryGetValue(elevatorId,out var elevatorData) is false)return;

            if (elevatorData.ElevatorButtonId != arg2.Id)
            {
                if(elevatorData.ButtonToFloor.TryGetValue(arg2.Id,out var floor) is false)return;
                if(elevatorData.Floors.TryGetValue(floor,out var floorTransform) is false)return;
                var currentPosition = elevatorData.Rigidbody.position;
                var targetPosition = currentPosition;
                targetPosition.y = floorTransform.position.y;
                
                _logger.LogInformation($"Elevator {elevatorId} to {floor+1}F");

                if (_cts.TryGetValue(elevatorData.ElevatorId, out var cts))
                {
                    cts.Cancel();
                    cts.Dispose();
                }

                cts = _cts[elevatorData.ElevatorId] = new CancellationTokenSource();

                await BITween.MoveToForward(elevatorData.Rigidbody.MovePosition, currentPosition,targetPosition, 1, Vector3.MoveTowards,cts.Token);
            }
            else
            {
                _logger.LogInformation($"Elevator {elevatorId} Menu");
                var hotKeyCollections = new HotkeyCollection();
                foreach (var (buttonId,floor) in elevatorData.ButtonToFloor)
                {
                    if(_entitiesService.TryGetEntity(buttonId,out var buttonEntity) is false)continue;
                    if(buttonEntity.ServiceProvider.QueryComponents(out IWorldInteractable buttonInteractable) is false)continue;
                    var hotkeyProvider = new HotkeyProvider
                    {
                        Name = $"{floor+1}F",
                        Description = $"Elevator to {floor+1}F",
                        Enabled = buttonId!=arg2.Id,
                        OnPerform = () =>
                        {
                            if(buttonEntity.CancellationToken.IsCancellationRequested)return;
                            OnInteraction(arg1, buttonInteractable, WorldInteractionProcess.System, arg4);
                        }
                    };
                    hotKeyCollections.Register(hotkeyProvider);
                }
                _uxHotKey.Perform(hotKeyCollections);
            }
        }


        private void OnNodeRegistered(IEntity entity)
        {
            if (entity.ServiceProvider.QueryComponents(out UnityElevatorNode elevatorNode) is false) return;
            _elevatorNodes[entity.Id]=elevatorNode;
            var elevatorData = new ElevatorData
            {
                ElevatorId = entity.Id,
                Rigidbody = elevatorNode.Platform,
            };
            for (var i = 0; i < elevatorNode.FloorButtons.Length; i++)
            {
                var button = elevatorNode.FloorButtons[i];
                var buttonId = button.gameObject.GetInstanceID();
                _buttonToElevator[buttonId] = entity.Id;
                elevatorData.ButtonToFloor[buttonId] = i;
                elevatorData.Floors[i] = elevatorNode.Floors[i].transform;
            }
            elevatorData.ElevatorButtonId = elevatorNode.ElevatorButton.GetInstanceID();
            _buttonToElevator[elevatorData.ElevatorButtonId]=entity.Id;
            _elevatorData[entity.Id] = elevatorData;
        }

        public void Dispose()
        {
            _entitiesService.OnAdd -= OnNodeRegistered;
            _interactionService.OnInteraction-=OnInteraction;
        }
    }
}