using System;
using System.Collections;
using System.Configuration;
using System.Data;
using System.Linq;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.HtmlControls;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Net;
using System.Web.Configuration;
using System.Data.SqlClient;

public partial class Order : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
        if (Session["UserName"] == null)
        {
            Response.Redirect("~/Movies.aspx");
        }
        else
        {
            message.Text = "Welcome " + Session["UserName"].ToString() + " please continue to download the film :))";
        }
    }
    protected void BtnSubmit_Click(object sender, EventArgs e)
    {
        CardValidator CardValidator;
        bool test;
        test = CardValidator.Validate(Ddlcardtype.SelectedValue, Txtcardnumber.Text);

        if (test == true)
        {
            string con = WebConfigurationManager.ConnectionStrings["ConnectionStringMovies"].ConnectionString;
            SqlConnection connection = new SqlConnection(con);
            SqlCommand command = new SqlCommand("Download Film", connection);
            command.CommandType = CommandType.StoredProcedure;
            command.Parameters.Add(new SqlParameter("@FilmID", SqlDbType.Int, 4));
            command.Parameters["@FilmID"].Value = Session["FilmID"];
            SqlCommand commandDownload = new SqlCommand("Download Film Proccess", connection);
            commandDownload.CommandType = CommandType.StoredProcedure;
            commandDownload.Parameters.Add(new SqlParameter("@FilmID", SqlDbType.Int, 4));
            commandDownload.Parameters["@FilmID"].Value = (int)Session["FilmID"];
            commandDownload.Parameters.Add(new SqlParameter("@CustomerID", SqlDbType.Int, 4));
            commandDownload.Parameters["@CustomerID"].Value = (int)Session["UserId"];
            commandDownload.Parameters.Add(new SqlParameter("@CreditCard", SqlDbType.BigInt));
            commandDownload.Parameters["@CreditCard"].Value = Convert.ToInt64(Txtcardnumber.Text);


            try
            {
                connection.Open();
                message.Text = "Thanks for choosing our site your downloading will start in a few minutes";

                commandDownload.ExecuteNonQuery();
                SqlDataReader reader = command.ExecuteReader();

                string Url, Title;
                reader.Read();
                Url = (string)reader.GetValue(0);
                Title = (string)reader.GetValue(1);
                Response.ContentType = "application/x-unknown";
                Response.AppendHeader("Content-Disposition",
                      "attachment; filename=\"" + Title + "\"");
                Response.WriteFile(Url);
                reader.Close();
            }
            catch
            {
                message.Text = "There is an Error try again.. ";

            }
            finally
            {
                connection.Close();
            }
        }
        else
        {
            message.Text = "The card number is not valid try again...";

        }
    }

    public class CardValidator
    {
        private CardValidator() { }

        public static bool Validate(string cardType, string CardNumber)
        {
            byte[] num = new byte[16]; // number to validate 

            int len = 0;
            for (int i = 0; i < CardNumber.Length; i++)
            {
                if (char.IsDigit(CardNumber, i))
                {
                    if (len == 16) return false; // number has too many digits 
                    num[len++] = byte.Parse(CardNumber[i].ToString ());
                }
            }
            // Validate based on card type
            switch (cardType)
            {
                case "MasterCard":
                    if (len != 16) //tests length
                        return false;
                    if ((num[0] != 5) || (num[1] == 0) || (num[1] > 5)) //tests prefix
                        return false;
                    break;

                case "VISA":
                    if (len != 16 && len != 13)
                        return false;
                    if (num[0] != 4)
                        return false;
                    break;

                case "AmericanExpress":
                    if (len != 15)
                        return false;
                    if ((num[0] != 3) || (num[1] != 4) && (num[1] != 7))
                        return false;
                    break;

                case "JCB":
                    if ((len != 16) && (len != 15))
                        return false;
                    if ((num[0] != 3) || (num[1] != 5))
                        return false;
                    break;
            }

             //Use Luhn Algorithm to validate 
            int sum = 0;
            for (int i = len - 1; i >= 0; i--)
            {
                if (i % 2 == len % 2)
                {
                    int n = num[i] * 2;
                    sum += (n / 10) + (n % 10);
                }
                else
                    sum = sum + num[i];
            }
            return (sum % 10 == 0);
        }
    }

    protected void Buttoncancel0_Click(object sender, EventArgs e)
    {
        Response.Redirect("~/Movies.aspx");
    }
}