using UnityEngine;
using System.Collections;
using System.Collections.Generic;

public class Game
{
  Vector3Int[] poss = new Vector3Int[9 * 7 * 9]; // not bounds compliant...

  public delegate void Step();
  public static event Step OnStep;

  public delegate void Eat(Vector3 pos);
  public static event Eat OnEat;

  public delegate void Smell();
  public static event Smell OnSmell;

  public delegate void Bump(Vector3 dir);
  public static event Bump OnBump;

  public delegate void Crash();
  public static event Crash OnCrash;


  bool danger;
  public void SnakeStep(Main main, Design design) // snake data?
  {
    OnStep();

    Vector3Int future = main.snake[0] + main.dir;
    if (main.snake.Contains(future) || Main.OutOfBounds(future, design.bounds))
    {
      if (!danger)
      {
        // main.snake.RemoveAt(0);
        OnBump(main.dir);

        danger = true;
      }
      else
      {
        main.snake.Insert(0, future);

        OnCrash();
      }

      return;
    }

    danger = false;

    if (Vector3.Distance(future, main.food) <= 1)
    {
      OnSmell();
    }

    // Grow System (OOP *don't run into tail)
    if (main.growQueue > 0)
    {
      main.growQueue--;
    }
    else
    {
      main.space.Add(main.snake[main.snake.Count - 1]);
      main.snake.RemoveAt(main.snake.Count - 1);
    }

    main.space.Remove(future);
    main.snake.Insert(0, future); // Grow

    if (main.fastQueue > 0)
    {
      main.fastQueue--;
    }

    // Eat Packing Peanut
    if (main.food == future)
    {
      main.growQueue += design.foodValue;
      main.justAte = 0;

      OnEat(future);

      if (main.space.Count == 0)
      {
        PlayerPrefs.SetInt("BoxFills", 1 + PlayerPrefs.GetInt("BoxFills", 0));
      }
      else
      {
        main.food = main.space[Random.Range(0, main.space.Count)];
        main.graphX.foodScale = 0;
      }
    }

    // Eat main.Core Piece
    for (int i = 0; i < main.core.Count; i++)
    {
      if (main.core[i] == future)
      {
        main.core.RemoveAt(i);

        main.growQueue += design.foodValue;
        main.justAte = 0;

        main.fastQueue += design.foodValue;

        OnEat(future);

        break;
      }
    }
  }
}