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

namespace ManagementSystem
{

    public partial class LoginForm : Form
    {
        SqlConnection sqlConn = UtilityClass.GetConn(MainForm.strAccountingBookID);
        SqlCommand sqlCmd = new SqlCommand();
        SqlDataReader sdrData = null;
        
        public LoginForm()
        {
            InitializeComponent();
        }

        #region 自定義程式
        public static DataSet GetAccountingBookList()   //取得帳本資料
        {
            DataSet dsData = new DataSet();
            try
            {
                string strCommand = string.Format("Select AccountingBookID,AccountingBookName From OTB_FNC_AccountingBookInfo Where Effective='Y'");

                using (SqlConnection sqlConn = UtilityClass.GetConn(MainForm.strAccountingBookID))
                {
                    using (SqlDataAdapter sqlAdapter = new SqlDataAdapter(strCommand, sqlConn))
                    {
                        if (sqlConn.State == ConnectionState.Closed)  //判斷連線狀態
                        {
                            sqlConn.Open();
                        }
                        sqlAdapter.Fill(dsData, "AccBookList");

                        //增加空白選項
                        DataRow drData = dsData.Tables["AccBookList"].NewRow();
                        drData["AccountingBookID"] = " ";
                        drData["AccountingBookName"] = "請選擇";
                        dsData.Tables["AccBookList"].Rows.Add(drData);

                        //資料進行排序
                        dsData.Tables["AccBookList"].DefaultView.Sort = "AccountingBookID ASC";

                    }
                }
                return dsData;
            }
            catch (Exception ex)
            {
                throw ex;
            }
        }

        public bool DataCheck()  //確認資料正確性
        {
            if (txtID.Text.Trim() == "")
            {
                MessageBox.Show("請輸入帳號", "提示");
                txtID.Focus();
                return false;
            }

            if (cbAccountingBook.SelectedValue.ToString().Trim() == "")
            {
                MessageBox.Show("請選擇帳本", "提示");
                cbAccountingBook.Focus();
                return false;
            }

            return true;
        }

        private void Login()
        {
            if (DataCheck())
            {
                sqlCmd.Connection = sqlConn;
                string strCmd = string.Format("Select MemberID From OTB_SYS_Members Where MemberID = '{0}' and Password='{1}'", txtID.Text.Trim(), Encrypt(txtPassword.Text.Trim()).ToString());
                sqlCmd.CommandText = strCmd;
                try
                {

                    if (sqlConn.State == ConnectionState.Open)
                    {
                        sdrData = sqlCmd.ExecuteReader();
                    }
                    else
                    {
                        sqlConn.Open();
                        sdrData = sqlCmd.ExecuteReader();
                    }
                    if (sdrData.HasRows)
                    {
                        MainForm.strKey = txtKey.Text.Trim();  //記錄Key值
                        MainForm.strActiveUserID = txtID.Text.Trim();  //記錄作業人員
                        MainForm.strAccountingBookID = cbAccountingBook.SelectedValue.ToString();   //記錄作業帳本
                        switch (cbAccountingBook.SelectedValue.ToString())   //顯示選擇帳本
                        {
                            case "Origtek":
                                ((MainForm)Owner).SsStatus.Items["tsslAccountingBook"].Text = "元赫科技";
                                ((MainForm)Owner).SsStatus.Items["tsslAccountingBook"].ForeColor = System.Drawing.Color.FromName("Blue");
                                break;
                            case "OrigtekEnergy":
                                ((MainForm)Owner).SsStatus.Items["tsslAccountingBook"].Text = "元赫環科";
                                ((MainForm)Owner).SsStatus.Items["tsslAccountingBook"].ForeColor = System.Drawing.Color.FromName("Red");
                                break;
                        }

                        this.Close();
                    }
                    else
                    {
                        MessageBox.Show("登入失敗，您的帳號、密碼可能有誤!", "注意");
                    }
                }
                catch (Exception ex)
                { }
                finally
                {
                    sdrData.Close();
                    sdrData = null;
                }
            }
        }
        #endregion

        #region 事件觸發及問題處理
        private void LoginForm_Load(object sender, EventArgs e)
        {
            this.StartPosition = FormStartPosition.CenterParent;
            cbAccountingBook.DataSource = GetAccountingBookList().Tables["AccBookList"];
            cbAccountingBook.ValueMember = "AccountingBookID";
            cbAccountingBook.DisplayMember = "AccountingBookName";
            cbAccountingBook.SelectedIndex = 1;  //方便測試使用
        }

        private void btClear_Click(object sender, EventArgs e)
        {
            txtID.Text = "";
            txtPassword.Text = "";
            cbAccountingBook.SelectedIndex = 0;
            txtKey.Text = "";
        }

        private void btClose_Click(object sender, EventArgs e)
        {
            Application.Exit();
        }

        private void btLogin_Click(object sender, EventArgs e)
        {
            Login();
        }

        private void txtPassword_KeyDown(object sender, KeyEventArgs e)
        {
            if (e.KeyCode == Keys.Enter)
            {
                Login();
            }
        }
        #endregion

        #region 登入時密碼驗證程式
        /// <summary>
        /// 帳號加密程式
        /// </summary>
        /// <param name="str"></param>
        /// <returns></returns>
        private static string Encrypt(string str)
        {
            string sEncrypt = DESEncrypt(str, ConfigurationManager.AppSettings["DefaultCryptionKey"].Trim(), ConfigurationManager.AppSettings["DefaultCryptionIV"].Trim());
            return sEncrypt;
        }

        //加密程式
        private static string DESEncrypt(string data, string strKey, string strIV)
        {

            //將key轉成utf8編碼 byte array
            byte[] tmpkey = System.Text.Encoding.UTF8.GetBytes(strKey);

            //將iv轉成utf8編碼 byte ayyay
            byte[] tmpIV = System.Text.Encoding.UTF8.GetBytes(strIV);

            MD5CryptoServiceProvider mD5Provider = new MD5CryptoServiceProvider();
            byte[] key = mD5Provider.ComputeHash(tmpkey);
            byte[] iv = mD5Provider.ComputeHash(tmpIV);


            //將data轉成utf8編碼 byte ayyay
            byte[] byteData = Encoding.UTF8.GetBytes(data);


            //加密
            RijndaelManaged aesProvider = new RijndaelManaged();
            ICryptoTransform aesEncrypt = aesProvider.CreateEncryptor(key, iv);
            byte[] result = aesEncrypt.TransformFinalBlock(byteData, 0, byteData.Length);


            //轉成base64字串
            return Convert.ToBase64String(result);
        }
        #endregion

        
    }
}