using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using ICSharpCode.SharpZipLib.Zip;

namespace Triggerless.Zip
{
    public partial class Chkn1 : System.Web.UI.Page
    {
        protected void Page_Load(object sender, EventArgs e) {
            int productID;
            if (!int.TryParse(Request["productID"], out productID))
            {
                Response.ContentType = "text/plain";
                Response.Write("Invalid Product ID in query string");
                return;
            }

            Response.ContentType = "application/octet-stream";
            Response.AddHeader("Content-Disposition", "attachment; filename=derived_" + productID + ".chkn");
            byte[] buffer = new ChknCreator().Create(productID);
            Response.BinaryWrite(buffer);
        }
    }
    
    public class ChknCreator
    {
        public byte[] Create(int productID) {
            MemoryStream stream = new MemoryStream();
            ZipOutputStream zoStream = new ZipOutputStream(stream);
            zoStream.SetLevel(5);
            ZipEntry jsonEntry = new ZipEntry("imvu-internal.json");
            jsonEntry.DateTime = DateTime.Now;
            zoStream.PutNextEntry(jsonEntry);
            byte[] jsonBytes = Encoding.ASCII.GetBytes("{}");
            zoStream.Write(jsonBytes, 0, jsonBytes.Length);

            ZipEntry indexEntry = new ZipEntry("index.xml");
            indexEntry.DateTime = DateTime.Now;
            zoStream.PutNextEntry(indexEntry);
            const string TEMPLATE =
                "<?xml version=\"1.0\" encoding=\"UTF-8\"?>\n<Template>\n<__DATAIMPORT>product://{0}/index.xml</__DATAIMPORT>\n</Template>\n";
            byte[] indexBytes = Encoding.UTF8.GetBytes(string.Format(TEMPLATE, productID));
            zoStream.Write(indexBytes, 0, indexBytes.Length);
            zoStream.Finish();

            stream.Position = 0;
            byte[] result = new byte[stream.Length];
            stream.Read(result, 0, result.Length);
            return result;
        }
    }

}