using System;
using System.Collections;
using System.Collections.Concurrent;
using System.Collections.Generic;
using System.Linq;
using System.Threading;
using BITKit;
using BITKit.Entities;
using Cinemachine;
using Cysharp.Threading.Tasks;
using Microsoft.Extensions.DependencyInjection;
using ParadoxNotion;
using UnityEngine;
using UnityEngine.InputSystem;

namespace Net.Project.B.Dialogue
{
    public class UnityDialogueCameraController : MonoBehaviour
    {
        [SerializeField] private CinemachineVirtualCameraBase virtualCamera;

        [SerializeField] private bool allowPlayerInput;

        [SerializeField] private bool isFixedCameraPosition;

        private readonly ValidHandle _allowCamera = new();

        private readonly Dictionary<int, IDialogueData> _dialogues = new();

        private CancellationTokenSource _dialogueCancel;

        private CinemachineTargetGroup _targetGroup;

        private readonly ConcurrentDictionary<int, Transform> _actors = new();
            
        private async void Start()
        {
            virtualCamera.enabled = false;

            if (isFixedCameraPosition)
            {
                var newGameObject = new
                    GameObject(nameof(CinemachineTargetGroup))
                    {
                        transform =
                        {
                            parent = transform.parent
                        }
                    };
                _targetGroup =newGameObject.AddComponent<CinemachineTargetGroup>();
                virtualCamera.LookAt = _targetGroup.transform;
            }
            
            try
            {
                await BITApp.WalkUntilInitialize.Task.AttachExternalCancellation(destroyCancellationToken);
            }
            catch (OperationCanceledException)
            {
            }
  
            var dialogueService = BITApp.ServiceProvider.GetRequiredService<IDialogueService>();

            dialogueService.OnDialogueStart += OnDialogueStart;
            dialogueService.OnDialogueEnd += OnDialogueEnd;
            
            _allowCamera.AddListener(x=>virtualCamera.enabled=x);
            
            if (allowPlayerInput is false)
            {
                _allowCamera.AddListener(x => { BITInputSystem.AllowInput.SetDisableElements(this, x); });
            }

            await destroyCancellationToken.WaitUntilCanceled();
            
            dialogueService.OnDialogueStart -= OnDialogueStart;
            dialogueService.OnDialogueEnd -= OnDialogueEnd;
        }

        private async void OnDialogueEnd(IDialogueData arg)
        {
            _allowCamera.AddElement(64);
            
            _dialogueCancel?.Cancel();

            _dialogueCancel = new CancellationTokenSource();
            
            _dialogues.TryRemove(arg.Identity);
            
            _allowCamera.RemoveElement(arg.Identity);
            
            try
            {
                await UniTask.Delay(512, cancellationToken: _dialogueCancel.Token);
            }
            catch (OperationCanceledException)
            {
                if (_dialogues.Count is not 0)
                    return;
            }

            _allowCamera.RemoveElement(64);

            try
            {
                if (isFixedCameraPosition)
                {
                    if (_actors.TryGetValue(arg.ActorIdentity, out var actor))
                    {
                        await UniTask.Delay(1000, cancellationToken: destroyCancellationToken);
                        if (actor)
                        {
                            _targetGroup.RemoveMember(actor);
                        }
                    }
                }
            }
            catch ( OperationCanceledException)
            {
                
            }
        }

        private UniTask OnDialogueStart(IDialogueData arg)
        {
            _allowCamera.AddElement(arg.Identity);
          
            SetCameraLook(arg);

            _dialogues.TryAdd(arg.Identity, arg);

            return UniTask.CompletedTask;
        }

        private void SetCameraLook(IDialogueData arg)
        {  
            var entitiesService = BITApp.ServiceProvider.GetRequiredService<IEntitiesService>();
            
            if (_allowCamera.Allow)
            {
                if (_actors.TryGetValue(arg.ActorIdentity, out var actor))
                {
                    if (isFixedCameraPosition)
                    {
                        _targetGroup.AddMember(actor,1,1);
                    }
                    else
                    {
                        virtualCamera.LookAt = actor;
                    }
          
                    return;
                }
                
                if (entitiesService.TryGetEntity(arg.ActorIdentity, out var entity) is false)
                {
                    foreach (var (id,localPlayer) in entitiesService.QueryComponents<IdComponent,LocalPlayerComponent>())
                    {
                        entitiesService.TryGetEntity(id.Id, out entity);
                    }
                }
                if (entity.ServiceProvider.GetService<Transform>() is { } entityTransform)
                {
                    if (isFixedCameraPosition)
                    {
                        _targetGroup.AddMember(entityTransform,1,1);
                    }
                    else
                    {
                          virtualCamera.LookAt = virtualCamera.Follow = entityTransform;
                    }

                    _actors.TryAdd(arg.ActorIdentity, entityTransform);
                }
            }
        }
    }
}