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

public class Menu_CreateItens : MonoBehaviour
{
    public GameObject objModel;
    public List<Sprite> sprites;
    public CanvasGroup thisCG;

    public IEnumerator CreateItens()
    {
        yield return new WaitForSeconds(.75f);

        float horizontal = -200;

        while (horizontal <= 200)
        {
            float vertical = -200;

            while (vertical <= 200)
            {
                GameObject obj = Instantiate(objModel, transform);

                float thishorizontal = horizontal;
                thishorizontal += Random.Range(-16.0f, 16.1f);

                float thisvertical = vertical;
                thisvertical += Random.Range(-16.0f, 16.1f);

                RectTransform rectObj = obj.GetComponent<RectTransform>();
                rectObj.anchoredPosition = 
                    new Vector2(thishorizontal, thisvertical);

                Image img = obj.GetComponent<Image>();
                img.sprite = sprites[Random.Range(0, sprites.Count)];

                obj.GetComponent<Menu_Item>().rect = rectObj;

                obj.transform.Rotate(new Vector3(0, 0, Random.Range(0, 360)));

                vertical += 80;

                StartCoroutine(ItemSpawnAnime(obj.transform));

                yield return new WaitForSeconds(.025f);
            }

            horizontal += 80;
        }
    }

    IEnumerator ItemSpawnAnime(Transform item)
    {
        float value = 0;
        item.localScale = new Vector3(0, 0, 0);
        while (item.localScale.x < 1)
        {
            value += Time.deltaTime * 2;

            item.localScale = new Vector3(value, value, 1);

            yield return new WaitForEndOfFrame();
        }

        item.localScale = new Vector3(1, 1, 1);
    }

    private bool IsVisible()
    {
        if (Camera.main.ScreenToViewportPoint(transform.position).x < -0.1f || Camera.main.ScreenToViewportPoint(transform.position).x > 1.1f)
        {
            return false;
        }
        else
        {
            return true;
        }
    }


    // Update is called once per frame
    void Update()
    {
        if (!thisCG)
        {
            thisCG = GetComponent<CanvasGroup>();
        }
        if (IsVisible() && thisCG.alpha != 1)
        {
            thisCG.alpha = 1;
        }
        else if (!IsVisible() && thisCG.alpha != 0)
        {
            thisCG.alpha = 0;
        }
    }
}