using System.Data;
using System.IO;
using System.Collections.Generic;
using UnityEngine;
#if UNITY_EDITOR
using Excel;
#endif

namespace MMO
{
    public abstract class MMOTableBase<T, U> : ScriptableObject where T : ScriptableObject
    {
        private static T mInstance;
        public static T Instance
        {
            get
            {
                if (mInstance == null)
                {
                    mInstance = Resources.Load<T>("MMOTable/" + typeof(T).Name);
                }

                return mInstance;
            }
        }

        [SerializeField]protected List<U> mDataList;

        public abstract U GetData(int pID);
        protected abstract U ParseData(DataRow pCollection);

        public void ParseExcel(string pFilePath)
        {
            int tColNum = 0, tRowNum = 0;
            Debug.Log(pFilePath);
            DataRowCollection tCollection = ReadExcelContext(pFilePath, ref tColNum, ref tRowNum);
            Debug.Log(typeof(T).Name +  ": 列数_" + tColNum + " ，行数_" + tRowNum);

            // 第一行变量名，循环列
            //for (int i = 0; i < tColNum; i++)
            //{
            //}

            //第二行开始才是数据，循环行
            mDataList = new List<U>(tRowNum - 1);
            for (int i = 1; i < tRowNum; i++)
            {
                mDataList.Add(ParseData(tCollection[i]));
            }
        }

        /// <summary>
        /// 读Excel
        /// </summary>
        /// <param name="pFilePath">文件路径</param>
        /// <param name="pColNum">行数</param>
        /// <param name="pRowNum">列数</param>
        /// <returns></returns>
        private DataRowCollection ReadExcelContext(string pFilePath, ref int pColNum, ref int pRowNum)
        {
#if UNITY_EDITOR
            FileStream stream = File.Open(pFilePath, FileMode.Open, FileAccess.Read, FileShare.Read);
            IExcelDataReader excelReader = ExcelReaderFactory.CreateBinaryReader(stream);

            DataSet result = excelReader.AsDataSet();
            // Tables[0] 下标0表示excel文件中第一张表的数据
            pColNum = result.Tables[0].Columns.Count;
            pRowNum = result.Tables[0].Rows.Count;
            return result.Tables[0].Rows;
#else
            return null;
#endif
        }
    }
}