using Shadowsocks.Properties;
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.IO;
using System.IO.Compression;
using System.Text;
using System.Windows.Forms;

namespace Shadowsocks.View
{
    public partial class QRCodeForm : Form
    {
        private string code;

        public QRCodeForm(string code)
        {
            this.code = code;
            InitializeComponent();
        }

        private string QRCodeHTML(string ssURL)
        {
            string html = Resources.qrcode;
            string qrcodeLib;

            byte[] qrcodeGZ = Resources.qrcode_min_js;
            byte[] buffer = new byte[1024 * 1024];  // builtin pac gzip size: maximum 1M
            int n;

            using (GZipStream input = new GZipStream(new MemoryStream(qrcodeGZ),
                CompressionMode.Decompress, false))
            {
                n = input.Read(buffer, 0, buffer.Length);
                if (n == 0)
                {
                    throw new IOException("can not decompress qrcode lib");
                }
                qrcodeLib = System.Text.Encoding.UTF8.GetString(buffer, 0, n);
            }
            string result = html.Replace("__QRCODELIB__", qrcodeLib);
            return result.Replace("__SSURL__", ssURL);
        }

        private void QRCodeForm_Load(object sender, EventArgs e)
        {
            QRCodeWebBrowser.DocumentText = QRCodeHTML(code);
        }
    }
}