using System;
using System.Collections.Specialized;
using System.IO;
using System.IO.Pipes;
using System.Text;
using System.Web;
using System.Windows.Forms;

namespace OutlookAddinProtocolHandler
{
    /// <summary>
    /// Tiny shim launched when the user clicks an <c>outlookaddin://</c> URL.
    /// Parses the URL and forwards a one-line command over the named pipe
    /// owned by the in-process VSTO add-in. If Outlook isn't running, the
    /// pipe connect will fail and we surface a MessageBox.
    /// </summary>
    public static class Program
    {
        private const string PipeName = "MarcusLaw.OutlookAddin";

        [STAThread]
        public static int Main(string[] args)
        {
            try
            {
                if (args.Length == 0)
                {
                    return Fail("השימוש: outlookaddin://compose?caseId=<id>");
                }

                var raw = args[0];
                if (!raw.StartsWith("outlookaddin://", StringComparison.OrdinalIgnoreCase))
                {
                    return Fail("URL לא תקין: " + raw);
                }

                var uri = new Uri(raw);
                var command = (uri.Host ?? "").ToLowerInvariant();
                var query = HttpUtility.ParseQueryString(uri.Query ?? string.Empty);

                switch (command)
                {
                    case "compose":
                        return SendCompose(query);
                    default:
                        return Fail("פעולה לא ידועה: " + command);
                }
            }
            catch (Exception ex)
            {
                return Fail("שגיאה: " + ex.Message);
            }
        }

        private static int SendCompose(NameValueCollection query)
        {
            var caseId = query["caseId"];
            if (string.IsNullOrWhiteSpace(caseId))
            {
                return Fail("חסר caseId בכתובת ה-URL");
            }

            var payload = "COMPOSE " + caseId.Trim() + "\n";
            try
            {
                using var pipe = new NamedPipeClientStream(".", PipeName, PipeDirection.InOut);
                pipe.Connect(timeout: 3000);
                var bytes = Encoding.UTF8.GetBytes(payload);
                pipe.Write(bytes, 0, bytes.Length);
                pipe.Flush();
                return 0;
            }
            catch (TimeoutException)
            {
                return Fail("Outlook אינו פתוח, או שהתוסף עדיין לא נטען.");
            }
            catch (IOException ex)
            {
                return Fail("תקלת תקשורת עם התוסף: " + ex.Message);
            }
        }

        private static int Fail(string message)
        {
            MessageBox.Show(message, "Marcus-Law OutlookAddin", MessageBoxButtons.OK, MessageBoxIcon.Warning);
            return 1;
        }
    }
}