using System;
using System.Collections;
using System.Collections.Generic;
using MoreMountains.Feedbacks;
using MoreMountains.Tools;
using UnityEngine;

namespace MoreMountains.Feel
{
    /// <summary>
    /// A class used to handle Feel's Snake demo's snake bodyparts
    /// </summary>
    public class SnakeBodyPart : MonoBehaviour
    {
        /// a position recorder this body part will look at to know where to go to
        public MMPositionRecorder TargetRecorder;
        /// a feedback to play when food gets eaten
        public MMFeedbacks EatFeedback;
        /// a feedback to play when this part appears
        public MMFeedbacks NewFeedback;
        public int Offset = 20;
        public int Index = 0;
        
        protected Snake _snake;
        protected BoxCollider2D _collider2D;

        /// <summary>
        /// On awake we store our collider and enable it after a delay
        /// </summary>
        protected virtual void Awake()
        {
            _collider2D = this.gameObject.MMGetComponentNoAlloc<BoxCollider2D>();
            StartCoroutine(ActivateCollider());
        }

        /// <summary>
        /// Activates this part's collider
        /// </summary>
        /// <returns></returns>
        protected virtual IEnumerator ActivateCollider()
        {
            yield return MMCoroutine.WaitFor(1f);
            _collider2D.enabled = true;
        }

        /// <summary>
        /// On update, we move to the recorded position of our predecessor
        /// </summary>
        protected void Update()
        {
            this.transform.position = TargetRecorder.Positions[Offset];
        }

        /// <summary>
        /// Called when the snake eats a new food
        /// </summary>
        /// <param name="intensity"></param>
        public virtual void Eat(float intensity)
        {
            EatFeedback?.PlayFeedbacks(this.transform.position, intensity);
        }

        /// <summary>
        /// Called when instantiating a new body part
        /// </summary>
        public virtual void New()
        {
            NewFeedback?.Initialization();
            NewFeedback?.PlayFeedbacks();
        }
        
        /// <summary>
        /// If we connect with the snake's head, we lose a part
        /// </summary>
        /// <param name="other"></param>
        protected void OnTriggerEnter2D(Collider2D other)
        {
            if (Index == 0)
            {
                return;
            }
            
            _snake = other.GetComponent<Snake>();

            if (_snake != null)
            {
                _snake.Lose(this);    
            }
        }
    }    
}