Release v0.1.17 2026-07-19

src/game/rpgRoguelike/rewards.ts

@@ -18,6 +18,14 @@ import { MAX_RUN_GEAR_ENHANCEMENT, MAX_SPELL_RANK } from "./types";
 
 export const RUN_GEAR_SLOT_ORDER: readonly RunGearSlotId[] = ["weapon", "armor", "trinket"];
 
+export interface RunGearComparison {
+  readonly currentItem: RunGearItem | undefined;
+  readonly effectLabel: string;
+  readonly currentValue: number;
+  readonly replacementValue: number;
+  readonly delta: number;
+}
+
 const GEAR_SLOT_DATA: Record<RunGearSlotId, { label: string; statId: RunGearStatId }> = {
   weapon: { label: "Weapon", statId: "damage" },
   armor: { label: "Armor", statId: "maxHealth" },
@@ -36,6 +44,29 @@ export function equippedRunGear(
   return equipment[ownerId]?.[slotId];
 }
 
+/** Player weapons convert their damage budget into healing power in combat. */
+export function runGearEffectLabel(ownerId: RunGearOwnerId, statId: RunGearStatId): string {
+  if (statId === "damage") return ownerId === "player" ? "Healing power" : "Damage";
+  if (statId === "maxHealth") return "Max health";
+  return "Haste";
+}
+
+/** Comparison data shared by chest and shop projections on either display. */
+export function compareRunGear(
+  equipment: RunEquipment,
+  item: RunGearItem,
+): RunGearComparison {
+  const currentItem = equippedRunGear(equipment, item.ownerId, item.slotId);
+  const currentValue = currentItem?.statId === item.statId ? currentItem.statValue : 0;
+  return {
+    currentItem,
+    effectLabel: runGearEffectLabel(item.ownerId, item.statId),
+    currentValue,
+    replacementValue: item.statValue,
+    delta: item.statValue - currentValue,
+  };
+}
+
 export function createRunGearItem(
   id: string,
   ownerId: RunGearOwnerId,