using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Data.SqlClient;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
using ManagementSystem.Utility;

namespace ExportDataToFile
{
    public partial class Form1 : Form
    {
        //參數設定
        int intExportIndex = -1;
        SqlConnection sqlSourceConn = new SqlConnection();
        SqlConnection sqlTargetConn = new SqlConnection();
        public Form1()
        {
            InitializeComponent();
        }

        private void btnSourceConnTest_Click(object sender, EventArgs e)
        {
            try
            {
                string strCheck = CheckSource();
                //查詢來源資料庫中的資料表
                string strIP = txtSourceIP.Text.Trim();
                string strDBName = txtSourceDBName.Text.Trim();
                string strID = txtSourceID.Text.Trim();
                string strPWD = txtSourcePWD.Text.Trim();

                if (strCheck == "")
                {
                    if (cbSourceClass.Enabled)
                    {
                        LockSourceForm();

                        switch (cbSourceClass.SelectedItem.ToString().Trim())
                        {
                            case "MS-SQL":
                                sqlSourceConn = MSSQLUtility.GetConn(strIP, strDBName, strID, strPWD);
                                ShowMSSQLSourceTables(sqlSourceConn);
                                Application.DoEvents();
                                break;
                            case "MySQL":

                                break;
                            case "Oracle":

                                break;
                            case "PostgreSQL":

                                break;
                        }
                    }
                    else
                    {
                        UnLockSourceForm();
                    }
                }
                else
                {
                    MessageBox.Show(strCheck);
                }
            }
            catch (Exception ex)
            {
                ErrorHandler.WriteErrorLog("Form1.cs", ex);
            }
        }
        
        private void btnTargetConnTest_Click(object sender, EventArgs e)
        {
            try
            {
                string strCheck = CheckTarget();
                //查詢目標資料庫中的資料表
                string strIP = txtTargetIP.Text.Trim();
                string strDBName = txtTargetDBName.Text.Trim();
                string strID = txtTargetID.Text.Trim();
                string strPWD = txtTargetPWD.Text.Trim();

                if (strCheck == "")
                {
                    if (cbTargetClass.Enabled)
                    {
                        switch (cbTargetClass.SelectedItem.ToString().Trim())
                        {
                            case "MS-SQL":
                                sqlTargetConn = MSSQLUtility.GetConn(strIP, strDBName, strID, strPWD);
                                ShowMSSQLTargetTableList(sqlTargetConn);                                
                                Application.DoEvents();

                                break;
                            case "MySQL":

                                break;
                            case "Oracle":

                                break;
                            case "PostgreSQL":

                                break;
                        }
                        
                        LockTargetForm();
                    }
                    else
                    {
                        UnLockTargetForm();
                    }
                }
                else
                {
                    MessageBox.Show(strCheck);
                }
            }
            catch (Exception ex)
            {
                ErrorHandler.WriteErrorLog("Form1.cs", ex);
            }
        }

        private void dgvExportList_CellEndEdit(object sender, DataGridViewCellEventArgs e)
        {
            //try
            //{
            //    dgvExportList.Rows[e.RowIndex].Cells["clExport"].Value = true;
            //}
            //catch (Exception ex)
            //{
            //    ErrorHandler.WriteErrorLog("Form1.cs", ex);
            //}
        }

        private void dgvExportList_CellClick(object sender, DataGridViewCellEventArgs e)
        {
            try
            {
                LocatedTarget(e.RowIndex);
            }
            catch (Exception ex)
            {
                ErrorHandler.WriteErrorLog("Form1.cs", ex);
            }
        }

        private void dgvExportList_CellContentClick(object sender, DataGridViewCellEventArgs e)
        {
            try
            {
                var senderGrid = (DataGridView)sender;

                if (e.RowIndex >= 0)
                {
                    //清除該列資料
                    if (senderGrid.Columns[e.ColumnIndex] is DataGridViewButtonColumn)
                    {
                        CleanExpRow(dgvExportList, e.RowIndex);
                    }
                }
            }
            catch (Exception ex)
            {
                ErrorHandler.WriteErrorLog("Form1.cs", ex);
            }
        }

        private void txtWhere_Leave(object sender, EventArgs e)
        {
            try
            { 
                dgvExportList.Rows[intExportIndex].Cells["clWhere"].Value = txtWhere.Text.Trim();
            }
            catch (Exception ex)
            {
                ErrorHandler.WriteErrorLog("Form1.cs", ex);
            }
        }
        private void cbTargetTable_SelectedIndexChanged(object sender, EventArgs e)
        {
            try
            { 
                if (cbTargetTable.SelectedValue != null && intExportIndex != -1)
                {

                    //重新修改DataGridView的ComboBox的內容
                    switch (cbTargetClass.SelectedItem.ToString().Trim())
                    {
                        case "MS-SQL":
                            ShowMSSQLTargetColumnList(sqlTargetConn, cbTargetTable.SelectedValue.ToString());
                            break;
                        case "MySQL":

                            break;
                        case "Oracle":

                            break;
                        case "PostgreSQL":

                            break;                    
                    }
                    Application.DoEvents();
                }
            }
            catch (Exception ex)
            {
                ErrorHandler.WriteErrorLog("Form1.cs", ex);
            }
        }

        private void dgvColumnMapping_CellContentClick(object sender, DataGridViewCellEventArgs e)
        {
            try
            {
                var senderGrid = (DataGridView)sender;
                //觸發清除事件
                if (senderGrid.Columns[e.ColumnIndex] is DataGridViewButtonColumn && e.RowIndex >= 0)
                {
                    senderGrid.Rows[e.RowIndex].Cells["clExpColumn"].Value = false;
                    ((DataGridViewComboBoxCell)senderGrid.Rows[e.RowIndex].Cells["clTargetColumn"]).Value = null;                      
                }
            }
            catch (Exception ex)
            {
                ErrorHandler.WriteErrorLog("Form1.cs", ex);
            }
        }

        private void dgvColumnMapping_CellEndEdit(object sender, DataGridViewCellEventArgs e)
        {
            try
            {
                if (cbTargetTable.Enabled)
                {
                    //dgvColumnMapping.Rows[e.RowIndex].Cells["clExpColumn"].Value = true;
                    //dgvExportList.Rows[intExportIndex].Cells["clExport"].Value = true;
                    
                }
            }
            catch (Exception ex)
            {
                ErrorHandler.WriteErrorLog("Form1.cs", ex);
            }
        }
        private void btnExport_Click(object sender, EventArgs e)
        {
            try
            {
            }
            catch (Exception ex)
            {
                ErrorHandler.WriteErrorLog("Form1.cs", ex);
            }
        }

        private void Form1_FormClosing(object sender, FormClosingEventArgs e)
        {
            sqlSourceConn.Close();
            sqlSourceConn = null;
            sqlTargetConn.Close();
            sqlTargetConn = null;
        }

        private void btnMapping_Click(object sender, EventArgs e)
        {
            //自動預設產生所有的Mapping檔案
            dgvExportList.Rows[intExportIndex].Cells["clMappingData"].Value = GenMappingColumn();
            dgvExportList.Rows[intExportIndex].Cells["clExport"].Value = true;
            //設定來源與目標的資料表對應
            if (cbTargetTable.SelectedValue != null)
            {
                dgvExportList.Rows[intExportIndex].Cells["clTargetTable"].Value = cbTargetTable.SelectedValue.ToString();
            }
        }

        #region 自定義功能

        #region MS-SQL
        private void ShowMSSQLSourceTables(SqlConnection sqlConn)
        {
            try
            {
                string strGetMSSQLTableList = "Select [name] as TableName from sys.tables order by name";
                dgvExportList.DataSource = MSSQLUtility.GetSQLResult(strGetMSSQLTableList, sqlConn).Tables["Result"];
            }
            catch (Exception ex)
            {
                ErrorHandler.WriteErrorLog("Form1.cs", ex);
            }
        }

        private void ShowMSSQLTargetTableList(SqlConnection sqlConn)
        {
            try
            {
                string strGetMSSQLTableList = "Select [name] as TableName from sys.tables order by name";
                cbTargetTable.DataSource = MSSQLUtility.GetSQLResult(strGetMSSQLTableList, sqlConn).Tables["Result"];
            }
            catch (Exception ex)
            {
                ErrorHandler.WriteErrorLog("Form1.cs", ex);
            }
        }

        private void ShowMSSQLSourceColumnList(SqlConnection sqlConn, string strTableName)
        {
            try
            {
                string strGetMSSQLColumnList = "Select COLUMN_NAME From INFORMATION_SCHEMA.COLUMNS Where TABLE_NAME ='" + strTableName + "' Order by ORDINAL_POSITION";
                dgvColumnMapping.DataSource = MSSQLUtility.GetSQLResult(strGetMSSQLColumnList, sqlConn).Tables["Result"];
            }
            catch (Exception ex)
            {
                ErrorHandler.WriteErrorLog("Form1.cs", ex);
            }
        }
        private void ShowMSSQLTargetColumnList(SqlConnection sqlConn, string strTableName)
        {
            try
            {
                string strGetMSSQLColumnList = "Select COLUMN_NAME From INFORMATION_SCHEMA.COLUMNS Where TABLE_NAME ='" + strTableName + "' Order by ORDINAL_POSITION";
                this.clTargetColumn.DisplayMember = "COLUMN_NAME";
                this.clTargetColumn.DataSource = MSSQLUtility.GetSQLResult(strGetMSSQLColumnList, sqlConn).Tables["Result"];
                Application.DoEvents();
            }
            catch (Exception ex)
            {
                ErrorHandler.WriteErrorLog("Form1.cs", ex);
            }
        }

        #endregion  //End of MS-SQL

        private string CheckSource()
        {
            try
            {
                string strResult = "";

                if (cbSourceClass.SelectedItem == null)
                {
                    strResult = "請選擇來源資料庫類別";
                    cbSourceClass.Focus();
                    return strResult;
                }
                else
                {
                    if (txtSourceIP.Text.Trim() == "")
                    {
                        strResult = "來源資料庫IP為必填";
                        txtSourceIP.Focus();
                        return strResult;
                    }

                    if (txtSourceDBName.Text.Trim() == "")
                    {
                        strResult = "來源資料庫名稱為必填";
                        txtSourceDBName.Focus();
                        return strResult;
                    }

                    if (txtSourceID.Text.Trim() == "")
                    {
                        strResult = "來源資料庫帳號為必填";
                        txtSourceID.Focus();
                        return strResult;
                    }
                }
                return strResult;
            }
            catch (Exception ex)
            {
                ErrorHandler.WriteErrorLog("Form1.cs", ex);
                return "發生不明錯誤!";
            }
        }

        private string CheckTarget()
        {
            try
            {
                string strResult = "";

                if (cbTargetClass.SelectedItem != null)
                {
                    if (txtTargetIP.Text.Trim() == "")
                    {
                        strResult = "目標資料庫IP為必填";
                        txtTargetIP.Focus();
                        return strResult;
                    }

                    if (txtTargetDBName.Text.Trim() == "")
                    {
                        strResult = "目標資料庫名稱為必填";
                        txtTargetDBName.Focus();
                        return strResult;
                    }

                    if (txtTargetID.Text.Trim() == "")
                    {
                        strResult = "目標資料庫帳號為必填";
                        txtTargetID.Focus();
                        return strResult;
                    }
                }
                return strResult;
            }
            catch (Exception ex)
            {
                ErrorHandler.WriteErrorLog("Form1.cs", ex);
                return "發生不明錯誤!";
            }
        }

        private void LockSourceForm()
        {
            try
            {
                cbSourceClass.Enabled = false;
                txtSourceIP.Enabled = false;
                txtSourceID.Enabled = false;
                txtSourceDBName.Enabled = false;
                txtSourcePWD.Enabled = false;
                btnSourceConnTest.Text = "連線中…";
            }
            catch (Exception ex)
            {
                ErrorHandler.WriteErrorLog("Form1.cs", ex);
            }
        }

        private void UnLockSourceForm()
        {
            try
            {
                cbSourceClass.Enabled = true;
                txtSourceIP.Enabled = true;
                txtSourceID.Enabled = true;
                txtSourceDBName.Enabled = true;
                txtSourcePWD.Enabled = true;
                btnSourceConnTest.Text = "建立來源連線";
            }
            catch (Exception ex)
            {
                ErrorHandler.WriteErrorLog("Form1.cs", ex);
            }
        }

        private void LockTargetForm()
        {
            try
            {
                cbTargetClass.Enabled = false;
                cbTargetTable.Enabled = true;
                cbTargetTable.SelectedIndex = -1;
                txtTargetIP.Enabled = false;
                txtTargetID.Enabled = false;
                txtTargetDBName.Enabled = false;
                txtTargetPWD.Enabled = false;
                btnTargetConnTest.Text = "連線中…";
            }
            catch (Exception ex)
            {
                ErrorHandler.WriteErrorLog("Form1.cs", ex);
            }
        }

        private void UnLockTargetForm()
        {
            try
            {
                cbTargetClass.Enabled = true;
                cbTargetTable.DataSource = null;
                cbTargetTable.Enabled = false;
                txtTargetIP.Enabled = true;
                txtTargetID.Enabled = true;
                txtTargetDBName.Enabled = true;
                txtTargetPWD.Enabled = true;
                btnTargetConnTest.Text = "建立目標連線";
            }
            catch (Exception ex)
            {
                ErrorHandler.WriteErrorLog("Form1.cs", ex);
            }
        }
        
        private string GenMappingColumn()
        {
            string strExportColumns = "";
            string strSourceColumn = "";
            string strTargetColumn = "";

            //預設所有欄位均匯出
            foreach (DataGridViewRow dgRow in dgvColumnMapping.Rows)
            {
                //處理下拉欄位空白的問題
                if (dgRow.Cells["clExpColumn"].Value != null)
                {
                    if ((bool)dgRow.Cells["clExpColumn"].Value == true)
                    {
                        if (dgRow.Cells["clSourceColumn"].Value == null)
                        {
                            strSourceColumn = " ";
                        }
                        else
                        {
                            strSourceColumn = dgRow.Cells["clSourceColumn"].Value.ToString();
                        }

                        if (dgRow.Cells["clTargetColumn"].Value == null)
                        {
                            strTargetColumn = " ";
                        }
                        else
                        {
                            strTargetColumn = dgRow.Cells["clTargetColumn"].Value.ToString();
                        }

                        if (strExportColumns == "")
                        {

                            strExportColumns += strSourceColumn + "," + strTargetColumn;
                        }
                        else
                        {
                            strExportColumns += "|" + strSourceColumn + "," + strTargetColumn;
                        }
                    }
                }
            }

            return strExportColumns;
        }

        private void LocatedTarget(int intRowIndex)
        {
            if (cbTargetClass.SelectedIndex >= 0 && cbTargetClass.Enabled == false)
            {
                //cbTargetTable.SelectedValue = dgvExportList.Rows[intRowIndex].Cells["clSourceTable"].Value.ToString();

                string strTarget = "";
                string[] strColumnMapping = null;

                if (intRowIndex != -1)
                {
                    intExportIndex = intRowIndex;

                    //設定目標Table下拉式選單的內容
                    if (dgvExportList.Rows[intRowIndex].Cells["clTargetTable"].Value != null && dgvExportList.Rows[intRowIndex].Cells["clTargetTable"].Value.ToString() != "")
                    {
                        strTarget = dgvExportList.Rows[intRowIndex].Cells["clTargetTable"].Value.ToString();
                    }
                    else
                    {
                        strTarget = dgvExportList.Rows[intRowIndex].Cells["clSourceTable"].Value.ToString();
                    }

                    cbTargetTable.SelectedValue = strTarget;

                    //取得欄位對應字串陣列
                    if (dgvExportList.Rows[intRowIndex].Cells["clMappingData"].Value != null)
                    {
                        strColumnMapping = dgvExportList.Rows[intRowIndex].Cells["clMappingData"].Value.ToString().Split('|');
                    }

                    
                    //顯示欄位對應表的內容
                    if (cbTargetTable.SelectedValue != null)
                    {
                        switch (cbTargetClass.SelectedItem.ToString().Trim())
                        {
                            case "MS-SQL":
                                ShowMSSQLSourceColumnList(sqlSourceConn, strTarget.ToString());
                                Application.DoEvents();
                                break;
                            case "MySQL":

                                break;
                            case "Oracle":

                                break;
                            case "PostgreSQL":

                                break;
                        }
                    }

                    if (strColumnMapping != null)
                    {
                        string strSourceColumn = "";
                        string strTargetColumn = "";
                        foreach (string strColumn in strColumnMapping)
                        {
                            strSourceColumn = strColumn.Substring(0, strColumn.IndexOf(',')).Trim();
                            strTargetColumn = strColumn.Substring(strColumn.IndexOf(',') + 1).Trim();
                            foreach (DataGridViewRow dgvRow in dgvColumnMapping.Rows)
                            {
                                if (dgvRow.Cells["clSourceColumn"].Value.ToString() == strSourceColumn)
                                {
                                    dgvRow.Cells[0].Value = true;
                                }
                            }
                        }
                    }
                    else
                    {
                        //預設所有欄位均匯出
                        foreach (DataGridViewRow dgRow in dgvColumnMapping.Rows)
                        {
                            ((DataGridViewCheckBoxCell)dgRow.Cells["clExpColumn"]).Value = true;
                        }
                    }
                }
            }
        }
        
        private void CleanExpRow(DataGridView senderGrid, int intRowIndex)
        {
            senderGrid.Rows[intRowIndex].Cells["clExport"].Value = false;
            senderGrid.Rows[intRowIndex].Cells["clTargetTable"].Value = "";
            senderGrid.Rows[intRowIndex].Cells["clTableDel"].Value = false;
            senderGrid.Rows[intRowIndex].Cells["clDataTrim"].Value = false;
            senderGrid.Rows[intRowIndex].Cells["clMaxRecord"].Value = "";
            senderGrid.Rows[intRowIndex].Cells["clWhere"].Value = "";
            senderGrid.Rows[intRowIndex].Cells["clMappingData"].Value = "";
            CleanMappingRow(senderGrid, intRowIndex);
            txtWhere.Text = "";
            Application.DoEvents();
        }

        private void CleanMappingRow(DataGridView senderGrid,int intRowIndex)
        { 
            DataTable CleanTable = (DataTable)dgvColumnMapping.DataSource;
            CleanTable.Rows.Clear();
            dgvColumnMapping.DataSource = CleanTable;
        }
        #endregion

        
    }
}