using System;
using System.Collections.Generic;
using System.Data;
using BITKit;
using BITKit.Entities;
using Microsoft.Extensions.DependencyInjection;
using Net.Project.B.Health;
using NodeCanvas.Framework;
using Project.B.CharacterController;
using Unity.Mathematics;
using UnityEngine;
using UnityEngine.AI;

namespace Net.Project.B.AI
{
    public class NpcCharacterController : ICharacterController,IDisposable
    {
        private readonly IEntity _entity;
        
        private static readonly HashSet<int> Created = new();
        
        internal readonly IHealthComponent HealthComponent;
        internal readonly UnityNavMeshAgentController NavMeshAgentController;
        internal readonly Animator Animator;
        internal readonly NavMeshAgent Agent;
        internal readonly Transform Transform;
        public ICharacterState CurrentState { get; private set; }
        public event Action<ICharacterState, ICharacterState> OnStateChanged;
        private readonly IServiceProvider _serviceProvider;
        private readonly IFixedTicker _fixedTicker;

        private readonly IBlackboard _blackboard;
        private bool _isDisposed;
        public NpcCharacterController(IServiceProvider serviceProvider, IFixedTicker fixedTicker, NavMeshAgent agent, Transform transform, Animator animator, IBlackboard blackboard, IHealthComponent healthComponent, IEntity entity)
        {
            if (Created.Add(entity.Id) is false)
            {
                throw new DuplicateNameException();
            }
            
            _serviceProvider = serviceProvider;
            _fixedTicker = fixedTicker;
            Agent = agent;
            Transform = transform;
            Animator = animator;
            _blackboard = blackboard;
            HealthComponent = healthComponent;
            _entity = entity;

            _fixedTicker.Add(UpdateState);
            
            Agent.updateRotation = false;
            Agent.updatePosition = false;

            NavMeshAgentController = Transform.GetComponent<UnityNavMeshAgentController>();

            AllowMovement.AddElement(8964189);
            
            HealthComponent.OnHealthChanged += (x, y) =>
            {
                AllowMovement.SetDisableElements(HealthComponent,y<0);
            };
            
            AllowMovement.AddListener(x =>
            {
                if(x)
                {
                    TransitionState<ICharacterStateIdle>();
                }
                else
                {
                    DisposeState();
                }
                agent.isStopped = !x;
            });
        }

        public ICharacterState TransitionState<TState>() where TState : ICharacterState
        {
            if (_isDisposed) return null;
            var state = _serviceProvider.GetRequiredService<TState>();
            var newState= TransitionState(state);
            return newState;
        }

        public ICharacterState TransitionState(ICharacterState state)
        {
            AllowMovement.SetElements(this,state is not null);
            
            var current = CurrentState;
            CurrentState = state;
            OnStateChanged?.Invoke(current, state);
            
            return state;
        }

        public bool Enabled { get; set; }
        public event Action<ICharacterState> OnStateRegistered;
        public event Action<ICharacterState> OnStateUnRegistered;
        public IDictionary<Type, ICharacterState> StateDictionary { get; }
        public void Initialize()
        {
        }

        public void UpdateState(float deltaTime)
        {
            if (AllowMovement.Allow is false)
            {
                if (HealthComponent.HealthPoint < 0)
                {
                    
                }
                else
                {
                    
                }
                    return;
            }
            if(!Agent.isActiveAndEnabled)return;
            
            CurrentState?.OnStateUpdate(deltaTime);

            if (CurrentState is not null)
            {
                float3 velocity = Agent.desiredVelocity;
                
                quaternion rotation = Transform.rotation;

                quaternion viewRotation = rotation;

                float3 position = Transform.position;
                
                CurrentState.BeforeUpdateVelocity(deltaTime);
                
                CurrentState.UpdateVelocity(ref velocity, deltaTime);
                
                CurrentState.AfterUpdateVelocity(deltaTime);
                
                CurrentState.UpdateRotation(ref position, ref rotation, ref viewRotation, deltaTime);

                Agent.velocity = velocity;

                if (Agent.enabled)
                {
Transform.position = Agent.nextPosition;
                }

                Transform.rotation = rotation;
            }
        }

        public void DisposeState()
        {
            TransitionState(null);
            Agent.velocity  = Velocity= default;
        }

        public ValidHandle AllowMovement { get; } = new();
        public float Height => Agent.height;
        public float3 Center { get; }

        public float3 Position
        {
            get => Transform.position;
            set
            {
                Agent.Warp(value);
                Transform.position = value;
            }
        }

        public float3 Velocity
        {
            get => Agent.velocity;
            set => Agent.velocity = value;
        }
        public float3 ViewPosition => Position + (float3)Vector3.up;
        public float3 AngularVelocity { get; }

        public quaternion Rotation
        {
            get => Transform.rotation;
            set => Transform.rotation = value;
        }
        public quaternion ViewRotation { get; set; }
        public float3 SelfVelocity { get; set; }
        public bool IsGrounded { get; }
        public event Action<float3, float> OnLand;

        public void Dispose()
        {
            _isDisposed = true;
            _fixedTicker.Remove(UpdateState);
            Created.Remove(_entity.Id);
        }
    }

}