using System;
using System.Collections.Generic;
using System.Text;
using Microsoft.SensorServices.Rfid;
using System.IO;
using System.Security.AccessControl;
using Microsoft.SensorServices.Rfid.Design;
using Microsoft.SensorServices.Rfid.Utilities;

namespace myEventHandlers
{
    public class StampingEventHandler : RfidEventHandlerBase
    {
        string stamp;

        public override void Init(Dictionary<string, object> parameters, RfidProcessContext container)
        {
            stamp = (string)parameters["stamp"];

        }

        public static RfidEventHandlerMetadata GetEventHandlerMetadata(bool getVendorExtensionsAlso)
        {
            Dictionary<string, RfidEventHandlerParameterMetadata> metadata = new Dictionary<string, RfidEventHandlerParameterMetadata>();
            metadata.Add("stamp", new RfidEventHandlerParameterMetadata(typeof(string), "The string to stamp each tag read", 
                null, (bool)true));

            return new RfidEventHandlerMetadata("", metadata);
        }

        [RfidEventHandlerMethod]
        public TagReadEvent StampTagRead(TagReadEvent tre)
        {
            if (!tre.VendorSpecificData.ContainsKey("stamp"))
            {
                tre.VendorSpecificData.Add("stamp", stamp);
            }
            else
            {
                tre.VendorSpecificData["stamp"] = (string)tre.VendorSpecificData["stamp"] + "," + stamp;
            }
            
            return tre;
            // Illustrate usage RfidEventContext.Current.Data
            // returning null filters the event
        }
    }

    public class PostingEventHandler : RfidEventHandlerBase
    {
        static string defaultFilename = "C:\\temp.log";
        string filename = defaultFilename;
        
        public override void Init(Dictionary<string, object> parameters, RfidProcessContext container)
        {
            filename = defaultFilename;
            if (parameters.ContainsKey("filename"))
            {
                filename = (string)parameters["filename"];
            }
        }

        public static RfidEventHandlerMetadata GetEventHandlerMetadata(bool getVendorExtensionsAlso)
        {
            Dictionary<string, RfidEventHandlerParameterMetadata> metadata = new Dictionary<string, RfidEventHandlerParameterMetadata>();
            metadata.Add("Filename", new RfidEventHandlerParameterMetadata(typeof(string),
                "File to post to", defaultFilename, (bool)false));

            return new RfidEventHandlerMetadata("", metadata);
        }

        public static void Deploy(Dictionary<string, object> parameters)
        {
            string processRuntimeUser = (string)parameters[ProcessBinding.ProcessRuntimeUserKey];
            string filename = defaultFilename;
            if (parameters.ContainsKey("filename"))
            {
                filename = (string)parameters["filename"];
            }

            File.Create(filename);
            /* Give write permissions to the filename to processruntimeuserkey
             */
            FileSecurity fs = new FileSecurity();
            fs.SetAccessRule(new FileSystemAccessRule(processRuntimeUser, FileSystemRights.Write, AccessControlType.Allow));
            File.SetAccessControl(filename, fs);
        }

        [RfidEventHandlerMethod]
        public void PostToFile(TagReadEvent tre)
        {
            File.AppendAllText(filename, HexUtilities.HexEncode(tre.GetId()) + " " + tre.VendorSpecificData["stamp"]);
        }
    }

}