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src/components/game-canvas/combatFeedback.ts

@@ -0,0 +1,44 @@
+export type CombatFeedbackTargetKind = 'player' | 'companion' | 'hostile';
+
+export interface CombatFeedbackHealthSample {
+  key: string;
+  kind: CombatFeedbackTargetKind;
+  hp: number;
+}
+
+export interface CombatFeedbackEvent {
+  id: string;
+  targetKey: string;
+  kind: CombatFeedbackTargetKind;
+  delta: number;
+}
+
+export function buildCombatFeedbackEvents(
+  previousSamples: Map<string, CombatFeedbackHealthSample>,
+  currentSamples: CombatFeedbackHealthSample[],
+  sequence: number,
+) {
+  let nextSequence = sequence;
+  const events: CombatFeedbackEvent[] = [];
+
+  currentSamples.forEach(sample => {
+    const previous = previousSamples.get(sample.key);
+    if (!previous) return;
+
+    const delta = sample.hp - previous.hp;
+    if (delta === 0) return;
+
+    nextSequence += 1;
+    events.push({
+      id: `${sample.key}:${nextSequence}`,
+      targetKey: sample.key,
+      kind: sample.kind,
+      delta,
+    });
+  });
+
+  return {
+    events,
+    nextSequence,
+  };
+}