using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Data;
using System.Windows.Forms;

using System.Data.OleDb;

namespace LFP_Manager.Function
{
    public class csExcelFunction
    {
        public static DataTable[] ExcelImport(string Ps_FileName, string[] sheetName)
        {
            DataTable[] result = null;

            try
            {
                string ExcelConn = string.Empty;

                if (Ps_FileName.IndexOf(".xlsx") > -1)      // 확장자에 따라서 provider 주의
                {
                    ExcelConn = "Provider=Microsoft.ACE.OLEDB.12.0;Data Source=" + Ps_FileName
                        + ";Extended Properties='Excel 12.0;HDR=YES'";
                }
                else
                {
                    ExcelConn = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=" + Ps_FileName
                        + ";Extended Properties='Excel 8.0;HDR=YES'";
                }

                // 첫 번째 시트의 이름을 가져옮
                using (OleDbConnection con = new OleDbConnection(ExcelConn))
                {
                    using (OleDbCommand cmd = new OleDbCommand())
                    {
                        cmd.Connection = con;
                        con.Open();

                        DataTable dtExcelSchema = con.GetOleDbSchemaTable(OleDbSchemaGuid.Tables, null);

                        if (dtExcelSchema.Rows.Count > 0)
                        {
                            sheetName = new string[dtExcelSchema.Rows.Count];

                            for (int i = 0; i < dtExcelSchema.Rows.Count; i++)
                                sheetName[i] = dtExcelSchema.Rows[i]["TABLE_NAME"].ToString();
                        }
                        con.Close();
                    }
                }
                string msg = string.Empty;
                for (int i = 0; i < sheetName.Length; i++)
                    msg += sheetName[i] + "\r\n";
                //MessageBox.Show("sheetName = " + msg);

                // 첫 번째 쉬트의 데이타를 읽어서 datagridview 에 보이게 함.
                using (OleDbConnection con = new OleDbConnection(ExcelConn))
                {
                    using (OleDbCommand cmd = new OleDbCommand())
                    {
                        using (OleDbDataAdapter oda = new OleDbDataAdapter())
                        {
                            result = new DataTable[sheetName.Length];

                            for (int i = 0; i < sheetName.Length; i++)
                            {
                                result[i] = new DataTable();
                                result[i].TableName = sheetName[i];
                                cmd.CommandText = "SELECT * From [" + sheetName[i] + "]";
                                cmd.Connection = con;
                                con.Open();
                                oda.SelectCommand = cmd;
                                try
                                {
                                    oda.Fill(result[i]);
                                }
                                catch (Exception)
                                {
                                    //MessageBox.Show(e1.Message);
                                }
                                con.Close();
                            }
                        }
                    }
                }
            }
            catch (Exception e)
            {
                MessageBox.Show(e.Message, "Exception", MessageBoxButtons.OK, MessageBoxIcon.Error);
            }
            return result;
        }

        public static void ExcelExport(string Ps_FileName, string[] sheetName)
        {
            string ExcelConn = string.Empty;

            if (Ps_FileName.IndexOf(".xlsx") > -1)      // 확장자에 따라서 provider 주의
            {
                ExcelConn = "Provider=Microsoft.ACE.OLEDB.12.0;Data Source=" + Ps_FileName
                    + ";Extended Properties='Excel 12.0;HDR=YES;IMEX=3;READONLY=FALSE'";
            }
            else
            {
                ExcelConn = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=" + Ps_FileName
                    + ";Extended Properties='Excel 8.0;HDR=YES;IMEX=3;READONLY=FALSE'";
            }

            // 첫 번째 시트의 이름을 가져옮
            using (OleDbConnection con = new OleDbConnection(ExcelConn))
            {
                using (OleDbCommand cmd = new OleDbCommand())
                {
                    cmd.Connection = con;
                    con.Open();

                    DataTable dtExcelSchema = con.GetOleDbSchemaTable(OleDbSchemaGuid.Tables, null);

                    if (dtExcelSchema.Rows.Count > 0)
                    {
                        sheetName = new string[dtExcelSchema.Rows.Count];

                        for (int i = 0; i < dtExcelSchema.Rows.Count; i++)
                            sheetName[i] = dtExcelSchema.Rows[i]["TABLE_NAME"].ToString();
                    }
                    con.Close();
                }
            }
            using (OleDbConnection connection = 
                new OleDbConnection(@"Provider=Microsoft.ACE.OLEDB.12.0;Data Source=" + @"C:\Users\[...]\Classeur.xls"
                    + ";Extended Properties=\"Excel 8.0;HDR=NO;IMEX=1;READONLY=FALSE\""))
            {
                connection.Open();
                OleDbCommand commande = new OleDbCommand(
                  "INSERT INTO [Feuil1$](F1,F2,F3) VALUES ('A3','B3','C3');", connection);
                commande.ExecuteNonQuery();

                connection.Close();
                connection.Dispose();
            }
        }
    }
}