struct DropDateInt {
        DropDate dd;
        const Date zero_date = Date(1970, 1, 1);
	virtual void   SetData(const Value& data) { dd <<= zero_date + (int)data; }
	virtual Value  GetData() const            { return (Date)~dd - zero_date; }

        DropDateInt() { Add(dd.SizePos()); }
}

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Data.SQLite;
using System.Drawing;
using System.IO;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace convertdates
{
    public partial class Form1 : Form
    {
        DataTable dt = new DataTable();
        TransactionsTable transactionsTable = new TransactionsTable();
        ProductsTable productsTable = new ProductsTable();
        CustomersTable customersTable = new CustomersTable();

        string myConnection = "Data Source=sample.db;Version=3;";
        
        public Form1()
        {
            InitializeComponent();
            DateTime dt = new DateTime(1970, 1, 1);
            long sticks = dt.Ticks;
            label1.Text = sticks.ToString();
        }

        private string correctdate(long baddate)
        {
            DateTime dt = new DateTime(1970, 1, 1);
            long junk = baddate * 86400 * 10000000;
            long sticks = dt.Ticks;
            junk += sticks;
            DateTime retvalue = new DateTime(junk);
            // long datenum = dtp1.Value.Date.Ticks;
            // long dayssince1970 = ((baddate * 86400 * 10000000) - sticks) / 86400 / 10000000;
            return retvalue.ToShortDateString();
        }

        private void btnConvert_Click(object sender, EventArgs e)
        {
            dt = DisplayAllTransactions();
            foreach (DataRow row in dt.Rows)
            {
                transactionsTable.INVOICES_ID = int.Parse(row[0].ToString());
                transactionsTable.TRANSACTIONDATE = transactionsTable.DATEPAID = correctdate(long.Parse(row[1].ToString()));
                UpdateTransactions(transactionsTable);
            }
            dt = SelectProducts();
            foreach (DataRow row in dt.Rows)
            {
                productsTable.PROD_ID = int.Parse(row[0].ToString());
                productsTable.DATEPURCHASED = correctdate(long.Parse(row[1].ToString()));
                UpdateProducts(productsTable);
            }

        }
        public DataTable DisplayAllTransactions()
        {
            //SQLiteConnection First
            SQLiteConnection conn = new SQLiteConnection(myConnection);

            //Create a DAta Table to hold the datafrom database temporarily
            DataTable dt = new DataTable();

            try
            {
                //Write the SQL Query to Display all Transactions
                string sql = "SELECT INVOICES_ID, TRANSACTIONDATE, DATEPAID FROM INVOICES";

                //SQLiteCommand to Execute Query
                SQLiteCommand cmd = new SQLiteCommand(sql, conn);

                //SQLiteDataAdapter to Hold the data from database
                SQLiteDataAdapter adapter = new SQLiteDataAdapter(cmd);

                //Open DAtabase Connection
                conn.Open();

                adapter.Fill(dt);
            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.Message);
            }
            finally
            {
                if (ConnectionState.Open == conn.State) conn.Close();
            }

            return dt;
        }
        #region Method to Update transaction in Database
        bool UpdateTransactions(TransactionsTable p)
        {
            //create a boolean variable and set its initial value to false
            bool isSuccess = false;

            //Create SQL Connection for DAtabase
            SQLiteConnection conn = new SQLiteConnection(myConnection);

            try
            {
                //SQL Query to Update Data in dAtabase
                String sql = "UPDATE INVOICES SET TRANSACTIONDATE=@transactionDate, DATEPAID=@datePaid WHERE INVOICES_ID=@id";

                //Create SQL Cmmand to pass the value to query
                SQLiteCommand cmd = new SQLiteCommand(sql, conn);
                //Passing the values using parameters and cmd
                cmd.Parameters.AddWithValue("@transactionDate", p.TRANSACTIONDATE);
                cmd.Parameters.AddWithValue("@datePaid", p.DATEPAID);
                cmd.Parameters.AddWithValue("@id", p.INVOICES_ID);

                //Open the Database connection
                conn.Open();

                //Create Int Variable to check if the query is executed successfully or not
                int rows = cmd.ExecuteNonQuery();

                //if the query is executed successfully then the value of rows will be greater than 0 else it will be less than zero
                if (rows > 0)
                {
                    //Query ExecutedSuccessfully
                    isSuccess = true;
                }
                else
                {
                    //Failed to Execute Query
                    isSuccess = false;
                }
            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.Message);
            }
            finally
            {
                conn.Close();
            }

            return isSuccess;
        }
        #endregion
        #region Select method for Product Module
        public DataTable SelectProducts()
        {
            //Create Sql Connection to connect Databaes
            SQLiteConnection conn = new SQLiteConnection(myConnection);

            //DAtaTable to hold the data from database
            DataTable dt = new DataTable();

            try
            {
                //Writing the Query to Select all the products from database
                String sql = "SELECT PROD_ID, DATEPURCHASED FROM PRODUCTS";

                //Creating SQL Command to Execute Query
                SQLiteCommand cmd = new SQLiteCommand(sql, conn);

                //SQL Data Adapter to hold the value from database temporarily
                SQLiteDataAdapter adapter = new SQLiteDataAdapter(cmd);

                //Open DAtabase Connection
                conn.Open();

                adapter.Fill(dt);
            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.Message);
            }
            finally
            {
                conn.Close();
            }

            return dt;
        }
        #endregion
        #region Method to Update Product in Database
        bool UpdateProducts(ProductsTable p)
        {
            //create a boolean variable and set its initial value to false
            bool isSuccess = false;

            //Create SQL Connection for DAtabase
            SQLiteConnection conn = new SQLiteConnection(myConnection);

            try
            {
                //SQL Query to Update Data in dAtabase
                String sql = "UPDATE PRODUCTS SET DATEPURCHASED=@datepurchased WHERE PROD_ID=@id";

                //Create SQL Cmmand to pass the value to query
                SQLiteCommand cmd = new SQLiteCommand(sql, conn);
                //Passing the values using parameters and cmd
                cmd.Parameters.AddWithValue("@datepurchased", p.DATEPURCHASED);
                cmd.Parameters.AddWithValue("@id", p.PROD_ID);

                //Open the Database connection
                conn.Open();

                //Create Int Variable to check if the query is executed successfully or not
                int rows = cmd.ExecuteNonQuery();

                //if the query is executed successfully then the value of rows will be greater than 0 else it will be less than zero
                if (rows > 0)
                {
                    //Query ExecutedSuccessfully
                    isSuccess = true;
                }
                else
                {
                    //Failed to Execute Query
                    isSuccess = false;
                }
            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.Message);
            }
            finally
            {
                conn.Close();
            }

            return isSuccess;
        }
        #endregion

        private void btnSelectDB_Click(object sender, EventArgs e)
        {
            string ProgramDataDir = Path.Combine(Environment.ExpandEnvironmentVariables("%userprofile%"), "Documents") + "\\";
            Directory.CreateDirectory(ProgramDataDir);
            ofDialog.DefaultExt = "jts|.db";
            ofDialog.CheckFileExists = true;
            ofDialog.InitialDirectory = ProgramDataDir;
            if (ofDialog.ShowDialog() == DialogResult.OK)
            {
                myConnection = "Data Source=" + ofDialog.FileName + ";Version=3;";
            }
        }
        public DataTable SelectCustomers()
        {
            //SQL Connection for Database Connection
            SQLiteConnection conn = new SQLiteConnection(myConnection);

            //DataTble to hold the value from database and return it
            DataTable dt = new DataTable();

            try
            {
                //Write SQL Query t Select all the DAta from dAtabase
                string sql = "SELECT * FROM CUSTOMERS";

                //Creating SQL Command to execute Query
                SQLiteCommand cmd = new SQLiteCommand(sql, conn);

                //Creting SQL Data Adapter to Store Data From Database Temporarily
                SQLiteDataAdapter adapter = new SQLiteDataAdapter(cmd);

                //Open Database Connection
                conn.Open();
                //Passign the value from SQL Data Adapter to DAta table
                adapter.Fill(dt);
            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.Message);
            }
            finally
            {
                conn.Close();
            }

            return dt;
        }
        bool UpdateCustomers(CustomersTable dc)
        {
            //SQL Connection for Database Connection
            SQLiteConnection conn = new SQLiteConnection(myConnection);
            //Create Boolean variable and set its default value to false
            bool isSuccess = false;

            try
            {
                //SQL Query to update data in database
                string sql = "UPDATE CUSTOMERS SET CUSTNAME=@name, EMAIL=@email, CONTACT=@contact, ADDRESS=@address WHERE CUST_ID=@id";
                //Create SQL Command to pass the value in sql
                SQLiteCommand cmd = new SQLiteCommand(sql, conn);

                //Passing the values through parameters
                cmd.Parameters.AddWithValue("@name", dc.CUSTNAME);
                cmd.Parameters.AddWithValue("@email", dc.EMAIL);
                cmd.Parameters.AddWithValue("@contact", dc.CONTACT);
                cmd.Parameters.AddWithValue("@address", dc.ADDRESS);
                cmd.Parameters.AddWithValue("@id", dc.CUST_ID);

                //open the Database Connection
                conn.Open();

                //Int varialbe to check if the query executed successfully or not
                int rows = cmd.ExecuteNonQuery();
                if (rows > 0)
                {
                    //Query Executed Successfully 
                    isSuccess = true;
                }
                else
                {
                    //Failed to Execute Query
                    isSuccess = false;
                }
            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.Message);
            }
            finally
            {
                conn.Close();
            }

            return isSuccess;
        }
        public string GenerateNumber()
        {
            Random random = new Random();
            string r = "";
            int i;
            for (i = 1; i < 11; i++)
            {
                r += random.Next(0, 9).ToString();
            }
            return r;
        }
        private void btnGeneralize_Click(object sender, EventArgs e)
        {
            var rand = new Random();
            string[] firstNames = new string[] { "Jim", "Mary", "Catherine", "John", "Mark", "Luke", "Lucy", "Abi", "Roger", "Ruth" };
            string[] lastNames = new string[] { "Jones", "Smith", "Johnson", "Yancovich", "Steemburgin", "Carter", "Reagan", "Trump", "Jefferson", "Franklin" };
            dt = SelectCustomers();
            foreach (DataRow row in dt.Rows)
            {
                string CustFirstName = firstNames[rand.Next(10)];
                string CustLastName = lastNames[rand.Next(10)];
                string Email = CustFirstName + "." + CustLastName + "@gmail.com";
                string Contact = GenerateNumber();
                customersTable.CUST_ID = int.Parse(row[0].ToString());
                customersTable.CUSTNAME = CustFirstName + " " + CustLastName;
                customersTable.CONTACT = Contact;
                customersTable.EMAIL = Email;
                customersTable.ADDRESS = "0 Main Way";
                UpdateCustomers(customersTable);
            }    

        }

        private void dtp1_ValueChanged(object sender, EventArgs e)
        {
            DateTime dt = new DateTime(1970, 1, 1);
            long sticks = dt.Ticks;
            long datenum = dtp1.Value.Date.Ticks;
            long dayssince1970 = (datenum - sticks) / 86400 / 10000000;
            label1.Text = dayssince1970.ToString();
            Clipboard.SetText(label1.Text);
        }

    }
    class ProductsTable
        {
            //Getters and Setters for Product Module
            public int PROD_ID { get; set; }
            public string PRODNAME { get; set; }
            public string PRODDESCRIPTION { get; set; }
            public string DATEPURCHASED { get; set; }
            public decimal COST { get; set; }
            public int INVOICEID { get; set; }

        }
    public enum status
    {
        notpaid = 0,
        voided,
        partialpayment,
        paidinfull
    };
    class TransactionsTable
    {
        public int INVOICES_ID { get; set; }
        public int INVOICENUMBER { get; set; }
        public int CUSTOMERID { get; set; }
        public string TRANSACTIONDATE { get; set; }
        // public long due_date { get; set; }
        public string TERMS { get; set; }
        public decimal NONTAXABLESUB { get; set; }
        public decimal TAXABLESUB { get; set; }
        public decimal TAX { get; set; }
        public decimal GRANDTOTAL { get; set; }
        public decimal AMTPAID { get; set; }
        public string DATEPAID { get; set; }
        public int STATUS { get; set; }

    }
    class CustomersTable
    {
        public int CUST_ID { get; set; }
        public string CUSTNAME { get; set; }
        public string EMAIL { get; set; }
        public string CONTACT { get; set; }
        public string ADDRESS { get; set; }
        public string CITY { get; set; }
        public string STATE { get; set; }
        public string ZIP { get; set; }
        public int TAXABLE { get; set; }

    }
}