Implemented Device Usage feature for Fusion.

Essentials Core/PepperDashEssentialsBase/Devices/IUsageTracking.cs

@@ -0,0 +1,81 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using Crestron.SimplSharp;
+
+namespace PepperDash.Essentials.Core
+{
+    public interface IUsageTracking
+    {
+        UsageTracking UsageTracker { get; set; }
+    }
+
+    //public static class IUsageTrackingExtensions
+    //{
+    //    public static void EnableUsageTracker(this IUsageTracking device)
+    //    {
+    //        device.UsageTracker = new UsageTracking();
+    //    }
+    //}
+
+    public class UsageTracking
+    {
+        public event EventHandler<DeviceUsageEventArgs> DeviceUsageEnded;
+
+        public InUseTracking InUseTracker { get; protected set; }
+
+        public bool UsageIsTracked { get; set; }
+        public DateTime UsageStartTime { get; protected set; }
+        public DateTime UsageEndTime { get; protected set; }
+
+        public UsageTracking()
+        {
+            InUseTracker.InUseFeedback.OutputChange +=new EventHandler<EventArgs>(InUseFeedback_OutputChange);
+        }
+
+        void  InUseFeedback_OutputChange(object sender, EventArgs e)
+        {
+ 	        if(InUseTracker.InUseFeedback.BoolValue)
+            {
+                StartDeviceUsage();
+            }
+            else
+            {
+                EndDeviceUsage();
+            }
+        }
+
+
+        /// <summary>
+        /// Stores the usage start time
+        /// </summary>
+        public void StartDeviceUsage()
+        {
+            UsageStartTime = DateTime.Now;
+        }
+
+        /// <summary>
+        /// Calculates the difference between the usage start and end times, gets the total minutes used and fires an event to pass that info to a consumer
+        /// </summary>
+        public void EndDeviceUsage()
+        {
+            UsageEndTime = DateTime.Now;
+
+            var timeUsed = UsageEndTime - UsageStartTime;
+
+            var handler = DeviceUsageEnded;
+
+            if (handler != null)
+            {
+                handler(this, new DeviceUsageEventArgs() { UsageEndTime = UsageEndTime, MinutesUsed = timeUsed.Minutes });
+            }
+        }
+    }
+
+    public class DeviceUsageEventArgs : EventArgs
+    {
+        public DateTime UsageEndTime { get; set; }
+        public int MinutesUsed { get; set; }
+    }
+}