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

public class Box : MonoBehaviour
{
    [System.NonSerialized] public int bombDivideCount = 3;
    float boxWidth;
    float parentHeight;


    void Start()
    {
        boxWidth = (transform as RectTransform).rect.width;
        parentHeight = (transform.parent as RectTransform).rect.height;
        GetComponent<BoxCollider2D>().size = Vector2.one * boxWidth;
    }

    // Update is called once per frame
    void Update()
    {
        transform.localPosition += Vector3.down * GameMode.boxDownSpeed * Time.deltaTime;
        if (transform.localPosition.y < -parentHeight / 2 + boxWidth / 2) Bomb();
    }

    bool hasBomb = false;
    public void Bomb()
    {
        if (hasBomb) return;
        hasBomb = true;

        RectTransform boxRTF = transform as RectTransform;
        float boxWidth = boxRTF.rect.width;

        //左下角开始
        Vector2 childStartPoint = new Vector2();
        childStartPoint.x = childStartPoint.y = -(boxWidth/2)+(boxWidth/bombDivideCount)/2;

        float childWidth = boxWidth / bombDivideCount;
        GameObject childPrefab = transform.GetChild(0).gameObject;

        for (int x = 0; x < bombDivideCount; x++)
        {
            for (int y = 0; y < bombDivideCount; y++)
            {
                Vector2 pos = new Vector2(childStartPoint.x + childWidth * x, childStartPoint.y + childWidth * y);
                RectTransform childRTF = Instantiate(childPrefab, boxRTF).transform as RectTransform;
                childRTF.localPosition = pos;
                childRTF.sizeDelta = new Vector2(childWidth, childWidth);
                childRTF.gameObject.SetActive(true);
                BombChild bombChild = childRTF.gameObject.AddComponent<BombChild>();
                Vector2 pointer = (bombChild.transform.position - transform.position).normalized;
                if (pointer.Equals(Vector2.zero))
                {
                    Destroy(childRTF.gameObject);
                    continue;
                }
                bombChild.velocity = pointer * Random.Range(600, 800);
                childRTF.gameObject.transform.SetParent(transform.parent);
            }
        }
        Destroy(gameObject);
    }
}