using System;
using System.IO;
using System.Xml.Linq;
using Pinwheel;

namespace TFS_Notification_Service
{
    public class TfsEventSubscriber : ITfsEventSubscriber
    {
        protected internal readonly AwardsEngine engine;

        public TfsEventSubscriber()
        {
            try
            {
                engine = IocContainer.Resolve<AwardsEngine>();
            }
            catch(Exception ex)
            {
                var error = string.Format(
                    "Error initializing TfsEventSubscriber:\n{0}\nStack Trace:\n{1}",
                    ex.Message, ex.StackTrace);
// ReSharper disable DoNotCallOverridableMethodsInConstructor
                // This virtual method call is to allow testing
                // to make sure the logging is called.
                LogMessage(error);
// ReSharper restore DoNotCallOverridableMethodsInConstructor
            }
        }

        public TfsEventSubscriber(AwardsEngine engine)
        {
            this.engine = engine;
        }

        public void Notify(string eventXml, string tfsIdentityXml)
        {
            try
            {
                SaveEventData(eventXml, tfsIdentityXml);
                var context = TfsAwardContextFactory.CreateFromXml(eventXml, tfsIdentityXml);
                if (context != null)
                    engine.Execute(context);
            }
            catch(Exception ex)
            {
                var error = string.Format(
                    "Error handling notification:\n{0}\nEvent Source:{1}\n\nStack Trace:\n{2}",
                    ex.Message, eventXml, ex.StackTrace);
                LogMessage(error);
            }
        }

        protected internal virtual void LogMessage(string message)
        {
            System.Diagnostics.Trace.WriteLine(message);
        }

        private const string FILEPATH = @"C:\Temp\TFS_Events";
        protected internal virtual void SaveEventData(string eventXml, string tfsIdentityXml)
        {
            var rootNode = new XElement("NotifyData");
            rootNode.Add(new XElement("EventXml", eventXml));
            rootNode.Add(new XElement("TfsIdentityXml", tfsIdentityXml));
            
            if(!Directory.Exists(FILEPATH))
                Directory.CreateDirectory(FILEPATH);

            var filename = string.Format(@"{0}\{1:MMddyyhhmm}.xml", FILEPATH, DateTime.Now);
            rootNode.Save(filename);
        }
    }
}