using System.Collections.Generic;
using System.Threading.Tasks;
using Sirenix.OdinInspector;
using Unity.Cinemachine;
using UnityEngine;

namespace DDD
{
    public enum CameraType
    {
        None = 0,
        RestaurantBaseCamera = 1
    }

    public class CameraManager : Singleton<CameraManager>, IManager
    {
        [ShowInInspector, ReadOnly]
        private Dictionary<CameraType, CameraGameObject> _cameraGameObjects = new();

        private CinemachineBrain _cinemachineBrain;
        private TaskCompletionSource<bool> _initializationTask = new();

        private void OnDestroy()
        {
            var snapshot = new List<CameraGameObject>(_cameraGameObjects.Values);
            foreach (var cameraGameObject in snapshot)
            {
                if (cameraGameObject)
                {
                    UnRegisterCamera(cameraGameObject);
                }
            }
        }

        public void PreInit()
        {
            _cinemachineBrain = GetComponent<CinemachineBrain>();
        }

        public Task Init()
        {
            return Task.CompletedTask;
        }

        public void PostInit()
        {
            var cameraGameObjects = FindObjectsByType<CameraGameObject>(FindObjectsInactive.Include, FindObjectsSortMode.None);
            foreach (var cameraGameObject in cameraGameObjects)
            {
                RegisterCamera(cameraGameObject);
            }
            _initializationTask.SetResult(true);
        }

        public void RegisterCamera(CameraGameObject cameraGameObject)
        {
            _cameraGameObjects.TryAdd(cameraGameObject.CameraType, cameraGameObject);
        }

        public void UnRegisterCamera(CameraGameObject cameraGameObject)
        {
            _cameraGameObjects.Remove(cameraGameObject.CameraType);
        }

        public void SwitchCamera(CameraType cameraType, CinemachineBlendDefinition.Styles blendStyle = CinemachineBlendDefinition.Styles.Cut, float blendDuration = 1f)
        {
            _cinemachineBrain.DefaultBlend = new CinemachineBlendDefinition(blendStyle, blendDuration);
            foreach (var item in _cameraGameObjects)
            {
                int newPriority = item.Value.CameraType == cameraType ? 10 : 0;
                item.Value.SetPriority(newPriority);
            }
        }

        public async Task<CameraGameObject> GetCameraGameObject(CameraType cameraType)
        {
            await _initializationTask.Task;

            if (_cameraGameObjects.TryGetValue(cameraType, out var cameraGameObject))
            {
                return cameraGameObject;
            }
            
            return null;
        }
    }
}