namespace SystemTrayMenu.Helpers
{
    using System;
    using System.IO;
    using System.Net;
    using System.Text;
    using System.Windows.Forms;
    using SystemTrayMenu.DataClasses;
    using SystemTrayMenu.UserInterface;

    public static class DragDropHelper
    {
        public static void DragEnter(object sender, DragEventArgs e)
        {
            object data = e.Data.GetData("UniformResourceLocator");
            MemoryStream ms = data as MemoryStream;
            if (ms != null)
            {
                byte[] bytes = ms.ToArray();
                Encoding encod = Encoding.ASCII;
                string url = encod.GetString(bytes);
                if (!string.IsNullOrEmpty(url))
                {
                    e.Effect = DragDropEffects.Copy;
                }
            }
        }

        public static void DragDrop(object sender, DragEventArgs e)
        {
            Menu menu = (Menu)sender;
            string path;
            if (menu == null)
            {
                path = Config.Path;
            }
            else
            {
                RowData rowData = (RowData)menu.Tag;
                path = rowData.TargetFilePath;
            }

            object data = e.Data.GetData("UniformResourceLocator");
            MemoryStream ms = data as MemoryStream;
            byte[] bytes = ms.ToArray();
            Encoding encod = Encoding.ASCII;
            string url = encod.GetString(bytes);
            CreateShortcut(url.Replace("\0", string.Empty), path);
        }

        private static void CreateShortcut(string url, string pathToStoreFile)
        {
            string pathToStoreIcons = Path.Combine(pathToStoreFile, "ico");
            var client = new WebClient();
            if (!Directory.Exists(pathToStoreIcons))
            {
                Directory.CreateDirectory(pathToStoreIcons);
            }

            Uri uri = new Uri(url);
            string hostname = uri.Host.ToString();

            string pathIconPng = Path.Combine(pathToStoreIcons, $"{hostname}.png");
            client.DownloadFile(
                @"http://www.google.com/s2/favicons?sz=32&domain=" + url,
                pathIconPng);
            string pathIcon = Path.Combine(pathToStoreIcons, $"{hostname}.ico");
            ImagingHelper.ConvertToIcon(pathIconPng, pathIcon, 32);
            File.Delete(pathIconPng);

            var title = url;

            // e.g. not working for https://web.skype.com/
            // var webGet = new HtmlWeb();
            // var document = webGet.Load(url);
            // var matchingElements = document.DocumentNode.Descendants()
            //              .Where(x => x.Name.Equals("title", StringComparison.InvariantCultureIgnoreCase));
            // if (matchingElements != null && matchingElements.Count() > 0)
            // {
            //    var titleNode = matchingElements.Last();
            //    if (titleNode != null)
            //    {
            //        title = titleNode.InnerText;
            //    }
            // }

            // e.g. not working for https://web.skype.com/
            ////var titleNode = document.DocumentNode.SelectNodes("title").Last(); //.SelectSingleNode("html/head/title");

            // e.g. not working for https://web.skype.com/
            ////WebClient client = new WebClient();
            // client.Headers.Add("user-agent", "Mozilla/5.0");
            // string source = client.DownloadString(url);
            // title = Regex.Match(source, @"\<title\b[^>]*\>\s*(?<Title>[\s\S]*?)\</title\>",
            //    RegexOptions.IgnoreCase).Groups["Title"].Value;

            title = title.Replace("/", " ").
                Replace("https", string.Empty).
                Replace("http", string.Empty);

            string invalid = new string(Path.GetInvalidFileNameChars()) + new string(Path.GetInvalidPathChars());
            foreach (char c in invalid)
            {
                title = title.Replace(c.ToString(), string.Empty);
            }

            title = Truncate(title, 128); // max 255
            string Truncate(string value, int maxLength)
            {
                if (!string.IsNullOrEmpty(value) &&
                    value.Length > maxLength)
                {
                    value = value.Substring(0, maxLength);
                }

                return value;
            }

            using (StreamWriter writer = new StreamWriter(pathToStoreFile + "\\" + title.Trim() + ".url"))
            {
                writer.WriteLine("[InternetShortcut]");
                writer.WriteLine($"URL={url.TrimEnd('\0')}");
                writer.WriteLine("IconIndex=0");
                writer.WriteLine($"HotKey=0");
                writer.WriteLine($"IDList=");
                writer.WriteLine($"IconFile={pathIcon}");
                writer.Flush();
            }
        }
    }
}