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

public class EditWindows : MonoBehaviour
{
    public RectTransform scrollRect;
    public GameObject labelItem;

    public InputField ioText;        // 输入：第 X 步
    public InputField qiehuanText;   // 输入：切换至第 Y 步

    public Button qiehuanBut;
    public Button fanhuiBut;

    public Text statusText;

    private List<string> excelData = new List<string>();

    void Start()
    {
        qiehuanBut.onClick.AddListener(OnConfirm);
        fanhuiBut.onClick.AddListener(OnBackClick);

        //LoadExcelToMemory();
        RefreshScrollList();
    }


    /*/// <summary>
    /// 读取Excel
    /// </summary>
    void LoadExcelToMemory()
    {
        excelData = ExcelHandler.ReadFirstColumn();

        if (excelData == null || excelData.Count == 0)
        {
            UpdateStatus("Excel 数据为空或读取失败！");
            return;
        }

        UpdateStatus($"读取Excel成功，共加载 {excelData.Count} 条步骤");
    }*/


    /// <summary>
    /// 刷新UI列表
    /// </summary>
    void RefreshScrollList()
    {
        foreach (Transform child in scrollRect)
            Destroy(child.gameObject);

        for (int i = 0; i < excelData.Count; i++)
        {
            GameObject obj = Instantiate(labelItem, scrollRect);
            LabelItem item = obj.GetComponent<LabelItem>();

            item.SetNameOrNumber(excelData[i], (i + 1).ToString());
        }
    }


    /// <summary>
    /// 按钮点击时处理交换
    /// </summary>
    private void OnConfirm()
    {
        if (!ValidateText(ioText.text, out int fromStep))
        {
            UpdateStatus("请输入正确的源步骤编号！");
            ClearInputs();
            return;
        }

        if (!ValidateText(qiehuanText.text, out int toStep))
        {
            UpdateStatus("请输入正确的目标步骤编号！");
            ClearInputs();
            return;
        }

        //防止交换同一个数字
        if (fromStep == toStep)
        {
            UpdateStatus("两个步骤一致，无需交换");
            ClearInputs();
            return;
        }

        OnSwapClick(fromStep, toStep);
    }


    /// <summary>
    /// 数字验证
    /// </summary>
    /// <param name="input"></param>
    /// <param name="result"></param>
    /// <returns></returns>
    private bool ValidateText(string input, out int result)
    {
        result = 0;

        if (string.IsNullOrWhiteSpace(input))
            return false;

        //允许负号，所以要严格 TryParse
        if (!int.TryParse(input, out result))
            return false;

        if (result <= 0)
        {
            result = 0;
            return false;
        }

        if (result > excelData.Count)
        {
            result = 0;
            return false;
        }

        return true;
    }


    /// <summary>
    /// 执行交换逻辑
    /// </summary>
    /// <param name="x"></param>
    /// <param name="y"></param>
    private void OnSwapClick(int x, int y)
    {
        int fromIndex = x - 1;
        int toIndex = y - 1;

        //保险检查
        if (fromIndex < 0 || toIndex < 0 ||
            fromIndex >= excelData.Count || toIndex >= excelData.Count)
        {
            UpdateStatus("输入范围错误！");
            ClearInputs();
            return;
        }

        //交换顺序
        string tmp = excelData[fromIndex];
        excelData[fromIndex] = excelData[toIndex];
        excelData[toIndex] = tmp;
        UpdateStatus($"已交换步骤：{x} ↔ {y}");
        //写回 Excel（即时保存）
        //ExcelHandler.WriteFirstColumn(excelData);

        //L对 moveItemInfos 重排（即时更新模型播放顺序）
        MoveItemManager.instance.ApplyOrderFromExcel();

        //UI 更新
        RefreshScrollList();

        ClearInputs();
    }


    private void ClearInputs()
    {
        ioText.text = "";
        qiehuanText.text = "";
    }


    void OnBackClick()
    {
        UpdateStatus("返回上级页面");
        //你自己的跳转逻辑
    }


    public void UpdateStatus(string msg)
    {
        if (statusText != null)
            statusText.text = msg;
    }
}