Plugins - Added prerequisites system

src/Artemis.Core/Plugins/Prerequisites/PrerequisiteActionProgress.cs

@@ -0,0 +1,91 @@
+using System;
+
+namespace Artemis.Core
+{
+    /// <summary>
+    ///     Represents progress on a plugin prerequisite action
+    /// </summary>
+    public class PrerequisiteActionProgress : CorePropertyChanged, IProgress<(long, long)>
+    {
+        private long _current;
+        private DateTime _lastReport;
+        private double _percentage;
+        private double _progressPerSecond;
+        private long _total;
+        private long _lastReportValue;
+
+        /// <summary>
+        ///     The current amount
+        /// </summary>
+        public long Current
+        {
+            get => _current;
+            set => SetAndNotify(ref _current, value);
+        }
+
+        /// <summary>
+        ///     The total amount
+        /// </summary>
+        public long Total
+        {
+            get => _total;
+            set => SetAndNotify(ref _total, value);
+        }
+
+        /// <summary>
+        ///     The percentage
+        /// </summary>
+        public double Percentage
+        {
+            get => _percentage;
+            set => SetAndNotify(ref _percentage, value);
+        }
+
+        /// <summary>
+        ///     Gets or sets the progress per second
+        /// </summary>
+        public double ProgressPerSecond
+        {
+            get => _progressPerSecond;
+            set => SetAndNotify(ref _progressPerSecond, value);
+        }
+
+        #region Implementation of IProgress<in (long, long)>
+
+        /// <inheritdoc />
+        public void Report((long, long) value)
+        {
+            (long newCurrent, long newTotal) = value;
+
+            TimeSpan timePassed = DateTime.Now - _lastReport;
+            if (timePassed >= TimeSpan.FromSeconds(1))
+            {
+                ProgressPerSecond = Math.Max(0, Math.Round(1.0 / timePassed.TotalSeconds * (newCurrent - _lastReportValue), 2));
+                _lastReportValue = newCurrent;
+                _lastReport = DateTime.Now;
+            }
+
+            Current = newCurrent;
+            Total = newTotal;
+            Percentage = Math.Round((double) Current / Total * 100.0, 2);
+
+            OnProgressReported();
+        }
+
+        #endregion
+
+        #region Events
+
+        /// <summary>
+        ///     Occurs when progress has been reported
+        /// </summary>
+        public event EventHandler? ProgressReported;
+
+        protected virtual void OnProgressReported()
+        {
+            ProgressReported?.Invoke(this, EventArgs.Empty);
+        }
+
+        #endregion
+    }
+}