using System;
using System.Collections;
using RPGCore.Movement.ObjectModules.UnitMovement.Events;
using RPGCore.ObjectModules.ActionObjectModule;
using UnityEngine;

namespace RPGCore.Movement.ObjectModules.UnitMovement.Actions
{
    public class DirectionMoveAction : BaseAction
    {
        private readonly Func<Vector3> _directionGetter;

        private UnitMovementModule _unitMovement;

        public DirectionMoveAction(Func<Vector3> directionGetter)
        {
            _directionGetter = directionGetter;
        }
        
        public override void CanDoIt()
        {
            Check(
                unit.GetComponent<ActionModule>().isControllable,
                UnitIsBusyMessage);
        }

        protected override void OnDoIt()
        {
            _unitMovement = unit.GetComponent<UnitMovementModule>();
            
            var moveStartEvent = new MoveStartEvent{ unit = unit };
            
            unit.events.InvokeBefore(moveStartEvent);
            Check(!moveStartEvent.isPrevented, ActionWasPreventedMessage);
            unit.events.InvokeAfter(moveStartEvent);

            unit.StartCoroutine(MoveCoroutine());
        }

        private IEnumerator MoveCoroutine()
        {
            while (state == ActionState.Running)
            {
                _unitMovement.moveInput = _directionGetter();
                yield return new WaitForFixedUpdate();
            }
        }
        
        protected override void OnEndIt()
        {
            _unitMovement.moveInput = Vector2.zero;
            _unitMovement.isSprinting = false;
            unit.events.Invoke(new MoveEndEvent{ unit = unit });
        }

        protected override void OnCancelIt()
        {
            OnEndIt();
        }
    }
}