using UnityEngine;

/// <summary>
/// 子弹充能对应的数据结构.
/// </summary>
public class BulletUICtl : MonoBehaviour
{
    /// <summary>
    /// 最大子弹数目.
    /// </summary>
    public int maxBulletNum;

    /// <summary>
    /// 当前的子弹数目
    /// </summary>
    protected int curBulletNum;

    private int critNum = 1;

    /// <summary>
    /// 默认的暴击子弹数量
    /// </summary>
    public static int defaultCritNum { get; private set; }

    /// <summary>
    /// 暴击子弹数量
    /// </summary>
    /// <value></value>
    public int CritBulletNum
    {
        get { return critNum; }
        set
        {
            if (value < 1) value = 1;
            else if (value > maxBulletNum) value = maxBulletNum;

            critNum = value;
            UpdateBulletType();
        }
    }

    /// <summary>
    /// 子弹底图
    /// </summary>
    public SpriteRenderer[] BottomArr;

    public SpriteRenderer[] BulletArr;

    public Sprite NormalSprite;

    public Sprite CritSprite;

    // Start is called before the first frame update
    void Start()
    {
        defaultCritNum = critNum;
        ResetToMaxBullet();
        UpdateBulletType();
    }

    /// <summary>
    /// 获取进度条进度.
    /// </summary>
    /// <returns></returns>
    public int GetCtlProgress()
    {
        return curBulletNum;
    }

    /// <summary>
    /// 设置进度.
    /// </summary>
    /// <param name="pro"></param>
    public void SetCtlProcess(int pro)
    {
        curBulletNum = pro;
        updateBulletUI(pro, maxBulletNum);
    }

    /// <summary>
    /// 重设子弹数目到最大.
    /// </summary>
    public void ResetToMaxBullet()
    {
        if (curBulletNum == maxBulletNum) return;

        curBulletNum = maxBulletNum;
        updateBulletUI(curBulletNum, maxBulletNum);
    }

    /// <summary>
    /// 减少子弹，返回减少后的子弹数目。
    /// </summary>
    /// <returns></returns>
    public int decBullet()
    {
        if (curBulletNum <= 0) return 0;

        curBulletNum--;
        updateBulletUI(curBulletNum, maxBulletNum);

        return curBulletNum;
    }

    /// <summary>
    /// 更新子弹显示
    /// </summary>
    /// <param name="curBNum"></param>
    /// <param name="totalBNum"></param>
    public void updateBulletUI(int curBNum, int totalBNum)
    {
        // 隐藏的子弹数量
        int hideCount = maxBulletNum - curBNum;

        for (int i = 0; i < BulletArr.Length; ++i)
        {
            if (hideCount > 0)
            {
                --hideCount;
                BulletArr[i].enabled = false;
            }
            else
                BulletArr[i].enabled = true;
        }
    }

    /// <summary>
    /// 更新子弹类型
    /// </summary>
    private void UpdateBulletType()
    {
        int count = critNum;

        for (int i = BulletArr.Length - 1; i >= 0; --i)
        {
            if (count > 0)
            {
                --count;
                BulletArr[i].sprite = CritSprite;
            }
            else
                BulletArr[i].sprite = NormalSprite;
        }
    }
}