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

/// <summary>
/// 所有关卡通关状态
/// </summary>
public class AllLevStatePanel : BasePanel
{
    //总关卡左滑右滑长度变化
    public RectTransform imgLev;
    //关卡条长度
    public float maxWidth=335f;

    //左滑
    public Button btnLeft;
    //右滑
    public Button btnRight;
    //关闭按钮
    public Button btnClose;

    //关卡范围
    public Text txtAllLev;

    public Transform content;

    //区间范围
    private int beginIndex;
    private int endIndex;

    //用于存储关卡按钮们
    public List<GameObject> itemList = new List<GameObject>();

    //所有关卡的状态信息
    private List<AllLevData> levList;
    private int num;

    public override void Init()
    {
        UpdatePan();

        btnClose.onClick.AddListener(() =>
        {
            UIManager.Instance.HidePanel<AllLevStatePanel>();
        });
        btnLeft.onClick.AddListener(() =>
        {
            beginIndex -= 30;
            endIndex -= 30;
            if (beginIndex<1)
            {
                beginIndex = levList.Count / 30 * 30+1;
                endIndex = levList.Count;
            }
            else if (endIndex%30!=0&&endIndex< levList.Count&& levList.Count>30)
            {
                endIndex = beginIndex / 30*30 + 30;
            }
            
            UpdataPanel(beginIndex, endIndex);
            InitInfo(beginIndex, endIndex);
            UpdateImg(num, beginIndex / 30 + 1);
        });

        btnRight.onClick.AddListener(() =>
        {
            beginIndex += 30;
            endIndex += 30;
            if (beginIndex > levList.Count)
            {
                beginIndex = 1;
                if (levList.Count>=30)
                {
                    endIndex = 30;
                }
                else
                {
                    endIndex= levList.Count;
                }
            }
            else if (endIndex > levList.Count&&beginIndex < levList.Count)
            {
                endIndex = levList.Count;
            }
            UpdataPanel(beginIndex, endIndex);
            InitInfo(beginIndex, endIndex);
            UpdateImg(num, beginIndex / 30+1);
        });
    }

    //一打开面板的显示数据
    private void UpdatePan()
    {
        //获取关卡的状态信息
        levList = GameDataMgr.Instance.levList;

        //得到一共要循环创建多少个区间按钮
        //由于向下取整 所以我们+1 就代表 平均分成了num个按钮
        if (levList.Count % 30 == 0)
        {
            num = levList.Count / 30;
        }
        else
        {
            num = levList.Count / 30 + 1;
        }
        beginIndex = 1;
        if (levList.Count>=30)
        {
            endIndex = 30;
        }
        else
        {
            endIndex = levList.Count;
        }
        UpdateImg(num, beginIndex / 30 + 1);
        UpdataPanel(beginIndex, endIndex);
        InitInfo(beginIndex, endIndex);
    }

    public void InitInfo(int beginIndex, int endIndex)
    {
        //记录当前区间按钮的 区间值
        this.beginIndex = beginIndex;
        this.endIndex = endIndex;

        //把区间显示的内容 更新了
        txtAllLev.text = "第"+ beginIndex + " - " + endIndex + "关";
    }

    /// <summary>
    /// 提供给其他地方 用于更新 当前选择区间的右侧按钮
    /// </summary>
    /// <param name="beginIndex"></param>
    /// <param name="endIndex"></param>
    public void UpdataPanel(int beginIndex, int endIndex)
    {
        //第一步：删除之前的单个按钮
        for (int i = 0; i < itemList.Count; i++)
        {
            //删除之前的 对象
            Destroy(itemList[i]);
        }
        //删除完成后 一定要清空列表
        itemList.Clear();

        //第二步：创建新的按钮
        for (int i = beginIndex; i <= endIndex; i++)
        {
            //根据信息 更新按钮数据
            GameObject levItem = Instantiate(Resources.Load<GameObject>("UI/LevItem2"));
            levItem.transform.SetParent(content, false);
            //根据信息 更新按钮数据
            LevItem2 item = levItem.GetComponent<LevItem2>();
            item.InitInfo(levList[i-1]);

            //创建成功后 把它记录到列表中
            itemList.Add(levItem);

        }
    }

    private void UpdateImg(float f,int lenght)
    {
        // 更新 Image 的宽度
        float newWidth = maxWidth * (lenght / f);
        imgLev.sizeDelta = new Vector2(newWidth, imgLev.sizeDelta.y);
    }
}