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

namespace MoreMountains.Feel
{
    /// <summary>
    /// A simple class used to spawn snake food in Feel's Snake demo scene
    /// </summary>
    public class SnakeFoodSpawner : MonoBehaviour
    {
        /// the food prefab to spawn
        public SnakeFood SnakeFoodPrefab;
        /// the maximum amount of food in the scene
        public int AmountOfFood = 3;
        /// the minimum coordinates to spawn at (in viewport units)
        public Vector2 MinRandom = new Vector2(0.1f, 0.1f);
        /// the maximum coordinates to spawn at (in viewport units)
        public Vector2 MaxRandom = new Vector2(0.9f, 0.9f);
        
        protected List<SnakeFood> Foods;
        protected Camera _mainCamera;

        /// <summary>
        /// On start, instantiates food
        /// </summary>
        protected virtual void Start()
        {
            _mainCamera = Camera.main;
            Foods = new List<SnakeFood>();
            for (int i = 0; i < AmountOfFood; i++)
            {
                SnakeFood food = Instantiate(SnakeFoodPrefab);
                food.transform.position = DetermineSpawnPosition();
                food.Spawner = this;
                Foods.Add(food);
            }
        }

        /// <summary>
        /// Determines a valid position at which to spawn food
        /// </summary>
        /// <returns></returns>
        public virtual Vector3 DetermineSpawnPosition()
        {
            Vector3 newPosition = MMMaths.RandomVector2(MinRandom, MaxRandom);
            newPosition.z = 10f;
            newPosition = _mainCamera.ViewportToWorldPoint(newPosition);
            return newPosition;
        }
    }
}