using System.Collections.Generic;
using Syntriax.Modules.Movement.State;
using UnityEngine;
using UnityEngine.Events;


namespace Syntriax.Modules.Movement
{
    public class MovementController : MonoBehaviour, IMovementController
    {
        public IMovement ActiveMovement { get; protected set; } = null;
        public UnityEvent<IMovement> OnMovementChanged { get; protected set; } = new UnityEvent<IMovement>();

        protected List<IMovement> movements = new List<IMovement>(32);
        protected IToggleState toggleState = null;

        protected virtual void Start()
        {
            toggleState = GetComponent<IToggleState>();
            RecacheMovements();
        }

        protected virtual void FixedUpdate()
        {
            if (!toggleState.Toggled)
                return;

            ActiveMovement.ApplyMovement();
        }

        public virtual void RecacheMovements()
        {
            foreach (IMovement movement in movements)
                movement.OnTakeOverStateChanged.RemoveListener(OnTakeOverListener);

            movements.Clear();
            GetComponents<IMovement>(movements);
            UpdateActiveMovement();

            foreach (IMovement movement in movements)
                movement.OnTakeOverStateChanged.AddListener(OnTakeOverListener);

        }

        private void OnTakeOverListener(bool arg0) => UpdateActiveMovement();

        protected virtual void UpdateActiveMovement()
        {
            foreach (IMovement movement in movements)
                if (movement.CanTakeOver)
                {
                    ActiveMovement = movement;
                    OnMovementChanged.Invoke(ActiveMovement);
                    return;
                }

            ActiveMovement = movements[movements.Count - 1];
            OnMovementChanged.Invoke(ActiveMovement);
        }
    }
}