using Assets.Scripts.Actions.Interfaces;
using System;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.AI;

public enum Tasks { Move, Interact };
public enum TaskStatus { Waiting, InProgress, Complete };
public enum ActionStates { Idle, Walking, Sleeping, Sitting };
public class Player : MonoBehaviour
{
    public event EventHandler<OnPlayerMovesEventArgs> OnPlayerMoves;


    public static Player Instance { get; private set; }

    [SerializeField]
    public NavMeshAgent _navAgent;
    [SerializeField]
    public Animator _animator;

    public bool allowMovement = true;
    private ActionStates _currentState;
    private Vector3 _groundDeltaPosition;

    public Dictionary<StatsId, Stat> PlayerStats;
    public IWorkPlace WorkPlace { get; set; }

    private readonly Queue<PlayerTasks> _tasks = new Queue<PlayerTasks>();
    private PlayerTasks _currentTask;

    private const string FALL_DOWN = "Fall";
    private const string SIT_DOWN = "SitDown";
    private const string STAND_UP = "StandUp";
    private const string WALK = "Walk";
    private const string WALK_VELOCITY = "WalkVelocity";

    private void Awake()
    {
        if (Instance != null)
        {
            Debug.Log("There's more than one player instance");
            return;
        }
        Instance = this;
    }
    private void Start()
    {
        TimeManager.OnMinuteChanged += UpdatePlayerState;
        allowMovement = true;
        _navAgent.updatePosition = false;
        PlayerStats = GameManager.Instance.PlayerStats;
    }

    private void OnDestroy()
    {
        TimeManager.OnMinuteChanged -= UpdatePlayerState;
    }

    private void Update()
    {
        if (_currentTask == null || _currentTask.Status == TaskStatus.Complete)
        {
            _tasks.TryDequeue(out _currentTask);
        }
        if (_currentTask != null)
        {
            switch (_currentTask.Task)
            {
                case Tasks.Move:
                    OnPlayerMoves?.Invoke(this, new OnPlayerMovesEventArgs() { PointToMove = _currentTask.Position });
                    _navAgent.SetDestination(_currentTask.Position);
                    _currentTask.UpdateStatus(MoveToPoint());
                    break;
                case Tasks.Interact:
                    _currentTask.UpdateStatus(InteractWithObject(_currentTask.Interactable));
                    break;
            }
        }
    }



    private TaskStatus MoveToPoint()
    {
        var worldDeltaPosition = _navAgent.nextPosition - transform.position;
        _groundDeltaPosition.x = Vector3.Dot(transform.right, worldDeltaPosition);
        _groundDeltaPosition.y = Vector3.Dot(transform.forward, worldDeltaPosition);

        Vector2 velocity = (Time.deltaTime > 1e-5f) ? _groundDeltaPosition / Time.deltaTime : Vector2.zero;
        var shouldMove = velocity.magnitude > 0.025f && _navAgent.remainingDistance > _navAgent.radius;
        if (_currentState != ActionStates.Sleeping)
        {
            _currentState = shouldMove ? ActionStates.Walking : ActionStates.Idle;

            SetPlayerState(ActionStates.Walking);
            _animator.SetFloat(WALK_VELOCITY, velocity.y);
        }

        return pathComplete() ? TaskStatus.Complete : TaskStatus.InProgress;
    }

    private bool pathComplete()
    {
        if (Vector3.Distance(_navAgent.destination, _navAgent.transform.position) <= _navAgent.radius)
        {
            if (!_navAgent.hasPath || _navAgent.velocity.sqrMagnitude == 0f)
            {
                SetPlayerState(ActionStates.Idle);
                return true;
            }
        }

        return false;
    }

    private TaskStatus InteractWithObject(BaseInteractableObject interactableObject)
    {
        interactableObject.Interact(this);
        return TaskStatus.Complete;
    }

    public void SetPlayerState(ActionStates newState)
    {
        switch (newState)
        {
            case ActionStates.Idle:
                _animator.SetBool(WALK, false);
                break;
            case ActionStates.Walking when _currentState == ActionStates.Sitting:
                _animator.SetBool(SIT_DOWN, false);
                _animator.SetBool(SIT_DOWN, true);
                _animator.SetBool(WALK, true);
                break;
            case ActionStates.Walking:
                _animator.SetBool(WALK, true);
                break;
            case ActionStates.Sleeping:
                break;
                break;
            case ActionStates.Sitting:
                break;
        }
        _currentState = newState;
    }

    private void OnAnimatorMove()
    {
        transform.position = _navAgent.nextPosition;
    }

    public void AddTask(PlayerTasks task)
    {
        _tasks.Enqueue(task);
    }

    public void UpdatePlayerState()
    {
        PlayerStats[StatsId.Food].deduct(0.034m); // 48 hours it's 100, 100/2880=~0.034 per minute
        switch (_currentState)
        {
            case ActionStates.Idle:
            case ActionStates.Walking:
                PlayerStats[StatsId.Energy].deduct(0.1m); // 24 hours it's 100, 100/1440=~0.096 per minute
                break;
            case ActionStates.Sleeping:
                PlayerStats[StatsId.Energy].increase(1m);
                break;
        }
        if (PlayerStats[StatsId.Energy].Value <= 10 && _currentState != ActionStates.Sleeping)
        {
            _currentState = ActionStates.Sleeping;
            allowMovement = false;
            _animator.SetBool(FALL_DOWN, true);
        }
        if (PlayerStats[StatsId.Energy].Value >= 100 && _currentState == ActionStates.Sleeping)
        {
            _currentState = ActionStates.Idle;
            allowMovement = true;
            _animator.SetBool(FALL_DOWN, false);
        }
    }

    public void BuyAction(IPlayerAction action)
    {
        PlayerStats[StatsId.Money].deduct(((ISellable)action).Price);
        action.ApplyAction(this);
    }

}