Add burn node when burning momentum on move

src/moves/action.ts

@@ -127,35 +127,53 @@ export function validAdds(baseStat: number): number[] {
 }
 
 function generateMechanicsNode(move: MoveDescription): Document {
-  let roll: Node;
-  let addDesc: Node[] = [];
+  const children: Node[] = [];
   if (moveIsAction(move)) {
     const adds = (move.adds ?? []).reduce((acc, { amount }) => acc + amount, 0);
-    roll = node("roll", {
-      values: [move.stat],
-      properties: {
-        action: move.action,
-        stat: move.statVal,
-        adds,
-        vs1: move.challenge1,
-        vs2: move.challenge2,
-      },
-    });
-    addDesc = (move.adds ?? [])
-      .filter(({ amount }) => amount != 0)
-      .map(({ amount, desc }) =>
-        node("add", { values: [amount, ...(desc ? [desc] : [])] }),
+
+    // Add "add" nodes for each non-zero add
+    children.push(
+      ...(move.adds ?? [])
+        .filter(({ amount }) => amount != 0)
+        .map(({ amount, desc }) =>
+          node("add", { values: [amount, ...(desc ? [desc] : [])] }),
+        ),
+    );
+
+    // Main roll node
+    children.push(
+      node("roll", {
+        values: [move.stat],
+        properties: {
+          action: move.action,
+          stat: move.statVal,
+          adds,
+          vs1: move.challenge1,
+          vs2: move.challenge2,
+        },
+      }),
+    );
+
+    // Momentum burn
+    if (move.burn) {
+      children.push(
+        node("burn", {
+          properties: { from: move.burn.orig, to: move.burn.reset },
+        }),
       );
+    }
   } else if (moveIsProgress(move)) {
-    roll = node("progress-roll", {
-      properties: {
-        // TODO: what about progress track id?
-        // TODO: use a ticks prop instead... or at least use a helper to get this
-        score: Math.floor(move.progressTicks / 4),
-        vs1: move.challenge1,
-        vs2: move.challenge2,
-      },
-    });
+    children.push(
+      node("progress-roll", {
+        properties: {
+          // TODO: what about progress track id?
+          // TODO: use a ticks prop instead... or at least use a helper to get this
+          score: Math.floor(move.progressTicks / 4),
+          vs1: move.challenge1,
+          vs2: move.challenge2,
+        },
+      }),
+    );
   } else {
     throw new Error("what kind of move is this?");
   }
@@ -164,7 +182,7 @@ function generateMechanicsNode(move: MoveDescription): Document {
   const doc: Document = [
     node("move", {
       values: [move.name],
-      children: [...addDesc, roll],
+      children,
     }),
   ];
   return doc;