add preliminary support for merits gained

EDPlayerJournal/BGS/MeritsGained.cs

@@ -0,0 +1,25 @@
+using EDPlayerJournal.Entries;
+
+namespace EDPlayerJournal.BGS;
+
+public class MeritsGained : Transaction {
+    public MeritsGained() { }
+
+    public MeritsGained(Entry entry) {
+        Entries.Add(entry);
+    }
+
+    /// <summary>
+    /// Number of merits gained
+    /// </summary>
+    public long Merits { get; set; } = 0;
+
+    /// <summary>
+    /// For what power those merits were gained
+    /// </summary>
+    public string Power { get; set; } = string.Empty;
+
+    public override string ToString() {
+        return string.Format("{0} Merits gained for {1}", Merits, Power);
+    }
+}

EDPlayerJournal/BGS/Parsers/PowerplayParser.cs

@@ -0,0 +1,29 @@
+using EDPlayerJournal.Entries;
+
+namespace EDPlayerJournal.BGS.Parsers;
+
+internal class PowerplayParser : ITransactionParserPart {
+    public void Parse(Entry entry, TransactionParserContext context, TransactionParserOptions options, TransactionList transactions) {
+        PowerplayEntry? p = entry as PowerplayEntry;
+        if (p == null) {
+            return;
+        }
+
+        if (context.LastMerits == null) {
+            context.LastMerits = p.Merits;
+        }
+
+        context.CurrentMerits = p.Merits;
+ 
+        if (context.LastMerits != context.CurrentMerits) {
+            transactions.Add(new MeritsGained(entry) {
+                Merits = ((long)(context.CurrentMerits - context.LastMerits)),
+                Power = p.Power,
+                System = context.CurrentSystem,
+                Faction = p.Power,
+            });
+        }
+
+        context.LastMerits = context.CurrentMerits;
+    }
+}

EDPlayerJournal/BGS/TransactionParser.cs

@@ -638,6 +638,7 @@ public class TransactionParser {
         { Events.Missions, new MissionsParser() },
         { Events.MultiSellExplorationData, new MultiSellExplorationDataParser() },
         { Events.Music, new MusicParser() },
+        { Events.Powerplay, new PowerplayParser() },
         { Events.ReceiveText, new ReceiveTextParser() },
         { Events.RedeemVoucher, new RedeemVoucherParser() },
         { Events.SearchAndRescue, new SearchAndRescueParser() },

EDPlayerJournal/BGS/TransactionParserContext.cs

@@ -69,6 +69,16 @@ internal class TransactionParserContext {
     /// </summary>
     public string? Settlement { get; set; } = null;
 
+    /// <summary>
+    /// Current Merits
+    /// </summary>
+    public long? CurrentMerits { get; set; } = null;
+
+    /// <summary>
+    /// Merits from last login
+    /// </summary>
+    public long? LastMerits { get; set; } = null;
+
     /// <summary>
     /// Returns true if the current session is legacy
     /// </summary>