using System;
using System.Data;
using System.IO;
using System.Windows.Forms;
using Forks.Utils.Data;
using Forks.Utils.IO;

namespace B3ButcherWeightClient {
  public partial class Login : Form {
    public Login() {
      InitializeComponent();
      using (TextReader reader = FS.OpenReader(ConfigUtil.ConfigFilePath,true)) {
        NutFile nutFile = NutFile.Parse(reader);
        txtBUser.Text = nutFile.AsString(ConfigItem.LastUser, "system");
      }
    }

    private void Form1_Load(object sender, EventArgs e) {

    }

    private void btnLogin_Click(object sender, EventArgs e) {
      ConfigUtil.Init();
      string loginUser = txtBUser.Text.Trim();
      string passWord = txtBPassword.Text.Trim();
      long userID = 0;
      string role = "";

      if (!CheckUser(loginUser)) {
        MessageBox.Show("用户名不存在！");
        txtBUser.Text = "";
        txtBPassword.Text = ""; 
        txtBUser.Focus();
      } else { 
        if (CheckPassword(loginUser, passWord, out userID, out role)) {
          Form main = new Main(this); 
          Hide();  
          using (var reader = FS.OpenReader(ConfigUtil.ConfigFilePath)) {
            var nutFile = NutFile.Parse(reader);
            nutFile.SetValue(ConfigItem.LastUser, loginUser);
            using (var writer = FS.OpenWriter(ConfigUtil.ConfigFilePath)) {
              nutFile.Write(writer);
            }
          }
          main.Show();
        } else {
          MessageBox.Show("密码错误！");
          txtBPassword.Text = ""; 
          txtBPassword.Focus();
        }
      }
    }

    private void btnSetConStr_Click(object sender, EventArgs e) {
      Form setForm = new Setting();
      setForm.ShowDialog();
    }


    private static bool CheckUser(string userName) {
      var conStr = ConfigUtil.ConnectionStr;

      if (string.IsNullOrEmpty(conStr)) {
        MessageBox.Show("未设置本地数据库信息");
        return false;
      }

      var isExist = false; 
      if (!string.IsNullOrEmpty(userName)) {
        string sql = "select PassWord from LoginUser where UserName='" + userName.Trim() + "'";
        try {
          using (ISqlUtil sqlUtil = new SqlUtil(conStr)) {
            DataSet dataSet = sqlUtil.ExecuteSql(sql);
            if (dataSet.Tables[0].Rows.Count > 0) {
              isExist = true;
            }
          }
        } catch (Exception ex) {
          MessageBox.Show(ex.Message);
          return false;
        }
      }

      return isExist;
    }


    private static bool CheckPassword(string userName, string password, out long userID, out string role) {
      userID = 0;
      role = "";
      string conStr = ConfigUtil.ConnectionStr;

      bool isRight = false;
      string sql = "select top 1  ID,RoleSchema from LoginUser where UserName='" + userName.Trim() + "' and PassWord=cast('" + password.Trim() + "' as binary)";

      try {
        using (ISqlUtil sqlUtil = new SqlUtil(conStr)) {
          DataSet dataSet = sqlUtil.ExecuteSql(sql);
          if (dataSet.Tables[0].Rows.Count > 0) {
            isRight = true;
            userID = (long)dataSet.Tables[0].Rows[0][0];
            role = (string)dataSet.Tables[0].Rows[0][1];
          }
        }
      } catch (Exception ex) {
        MessageBox.Show(ex.Message);
        return false;
      }

      return isRight;
    }
  }
}