Validate battle save equipment state

src/game/state/battleSaveState.ts

@@ -1,6 +1,7 @@
 import type { BattleBond, UnitData } from '../data/scenario';
 import type { CampaignStep } from './campaignState';
 import type { UnitDirection } from '../data/unitAssets';
+import { equipmentSlots, type EquipmentSlot } from '../data/battleItems';
 
 export type BattleSaveFaction = 'ally' | 'enemy';
 export type BattleSaveRosterTab = 'ally' | 'enemy';
@@ -74,6 +75,8 @@ type BattleSaveValidationOptions = {
   validUnitIds?: ReadonlySet<string>;
   validUsableIds?: ReadonlySet<string>;
   validItemIds?: ReadonlySet<string>;
+  validEquipmentItemIds?: ReadonlySet<string>;
+  validEquipmentSlotItems?: Partial<Record<EquipmentSlot, ReadonlySet<string>>>;
 };
 
 const unitDirections = new Set<UnitDirection>(['south', 'east', 'north', 'west']);
@@ -237,7 +240,7 @@ function areSavedBattleUnitsValid(units: unknown[], options: BattleSaveValidatio
 }
 
 function isSavedBattleUnitState(value: unknown, options: BattleSaveValidationOptions): value is SavedBattleUnitState {
-  if (!isRecord(value) || typeof value.id !== 'string' || value.id.length === 0 || !isRecord(value.equipment)) {
+  if (!isRecord(value) || typeof value.id !== 'string' || value.id.length === 0 || !isEquipmentSet(value.equipment, options)) {
     return false;
   }
 
@@ -266,6 +269,30 @@ function isSavedBattleUnitState(value: unknown, options: BattleSaveValidationOpt
   return value.direction === undefined || unitDirections.has(value.direction as UnitDirection);
 }
 
+function isEquipmentSet(value: unknown, options: BattleSaveValidationOptions): value is UnitData['equipment'] {
+  if (!isRecord(value) || Object.keys(value).length !== equipmentSlots.length) {
+    return false;
+  }
+
+  return equipmentSlots.every((slot) => isEquipmentStateForSlot(value[slot], slot, options));
+}
+
+function isEquipmentStateForSlot(value: unknown, slot: EquipmentSlot, options: BattleSaveValidationOptions) {
+  if (!isRecord(value)) {
+    return false;
+  }
+
+  const { itemId, level, exp } = value;
+  return (
+    typeof itemId === 'string' &&
+    itemId.length > 0 &&
+    (!options.validEquipmentItemIds || options.validEquipmentItemIds.has(itemId)) &&
+    (!options.validEquipmentSlotItems?.[slot] || options.validEquipmentSlotItems[slot].has(itemId)) &&
+    isPositiveInteger(level) &&
+    isNonNegativeFiniteNumber(exp)
+  );
+}
+
 function isBondArray(value: unknown, options: BattleSaveValidationOptions) {
   return (
     Array.isArray(value) &&