using CnasSynchronousCommon;
using System;
using System.Collections.Generic;
using System.Data;
using System.IO;
using System.Linq;
using System.Text;

namespace CnasSynchronusDAL
{
    public class ReadFileCommon01 : BaseReadFileMode
    {
        /// <summary>
        /// 分割每个元素的依据。0代表“ ”，1代表“\t”,2代表0和1的集合,3代表逗号
        /// </summary>
        public static string SplitType { get; set; }

        /// <summary>
        /// 起始行数（部分txt文件中，表数据的起始位置不是第一行，而是从其他行开始）
        /// </summary>
        public static int StartLineIndex { get; set; }

        /// <summary>
        /// 是否自定义创建日期字段
        /// </summary>
        public static bool IfCustomCreateDateColumn { get; set; }

        /// <summary>
        /// 后缀名类似于（.txt）
        /// </summary>
        public static string Suffix { get; set; }

        /// <summary>
        /// 以日期命名文件名称时的日期格式（yyyyMMdd）
        /// </summary>
        public static string FileNameFormat { get; set; }

        public static DataTable ReadTableStructure(string strFilePath)
        {
            DataTable dt = new DataTable();
            try
            {
                List<string> arryList = ReadFileMessage(strFilePath);
                
                if (arryList.Count >= StartLineIndex)
                {
                    string[] strRowDatas = arryList[StartLineIndex].Trim().Split(GetSplitStrings(), StringSplitOptions.RemoveEmptyEntries);
                    if (strRowDatas.Length > 0)
                    {
                        for (int i = 0; i < strRowDatas.Length; i++)
                        {
                            dt.Columns.Add($"F{i + 1}");
                        }

                        if (IfCustomCreateDateColumn)
                            dt.Columns.Add("日期(系统添加)");
                    }
                }
            }
            catch (Exception ex)
            {
                AppLog.Error(ex.Message);
            }
            return dt;
        }

        internal static DataTable ReadTableData(string strFilePath)
        {
            DataTable dt = new DataTable();
            try
            {
                List<string> arryList = ReadFileMessage(strFilePath);

                if (arryList.Count >= StartLineIndex)
                {
                    string[] strRowDatas = arryList[StartLineIndex].Trim().Split(GetSplitStrings(), StringSplitOptions.RemoveEmptyEntries);
                    if (strRowDatas.Length > 0)
                    {
                        for (int i = 0; i < strRowDatas.Length; i++)
                        {
                            dt.Columns.Add($"F{i + 1}");
                        }

                        if (IfCustomCreateDateColumn)
                            dt.Columns.Add("日期(系统添加)");
                    }
                }

                if (arryList.Count > 0)
                {
                    for (int i = 0; i < arryList.Count; i++)
                    {
                        if (i+1<StartLineIndex) continue;    //不是数据行

                        string strData = arryList[i].Trim();
                        string[] strRowDatas = strData.Split(GetSplitStrings(), StringSplitOptions.RemoveEmptyEntries);
                        if (strRowDatas.Length >0)
                        {
                            DataRow dr = dt.NewRow();
                                                      
                            for (int j = 0; j < strRowDatas.Length; j++)
                            {
                                dr[$"F{j + 1}"] = strRowDatas[j].Trim();
                            }

                            if (IfCustomCreateDateColumn)
                            {
                                if (FileNameFormat.Length > 0&&Suffix.Length>0)
                                {
                                    int subLength = (Suffix.Length - 1) * 2 + 1 + FileNameFormat.Length;
                                    DateTime dtTime = DateTime.ParseExact(string.Concat(strFilePath.Substring(strFilePath.Length - subLength, subLength).Take(FileNameFormat.Length)), FileNameFormat, new System.Globalization.CultureInfo("zh-CN", true));
                                    dr["日期(系统添加)"] = dtTime.ToString(FileNameFormat);
                                }
                            }

                            dt.Rows.Add(dr);
                        }
                    }
                }
            }
            catch (Exception ex)
            {
                AppLog.Error(ex.Message);
            }
            return dt;
        }

        private static List<string> ReadFileMessage(string strFilePath)
        {
            List<string> arryList = new List<string>();
            if (File.Exists(strFilePath))
            {
                FileStream fileStream = new FileStream(strFilePath, FileMode.Open, FileAccess.Read, FileShare.Read);
                StreamReader _StreamReaderKey = new StreamReader(fileStream, GetType(strFilePath));
                string strLine = "";
                while (!string.IsNullOrEmpty((strLine = _StreamReaderKey.ReadLine())))
                {
                    arryList.Add(strLine);
                }

                fileStream.Close();
            }
            return arryList;
        }

        private static string[] GetSplitStrings()
        {
            string[] splitStrings =null;
            switch (SplitType)
            {
                case "0":
                    splitStrings = new string[] { " "};
                    break;
                case "1":
                    splitStrings = new string[] { "\t" };
                    break;
                case "2":
                    splitStrings = new string[] { " ","\t" };
                    break;
                case "3":
                    splitStrings = new string[] { "," };
                    break;
            }
            return splitStrings;
        }
    }
}