feat(conditions): report the current value behind each condition

apps/api/src/conditions/game-condition.service.ts

@@ -27,9 +27,21 @@ export interface ConditionContext {
 
 type RepositoryScope = Pick<DataSource, 'getRepository'>;
 
+/**
+ * One condition's result, plus the number it was measured against.
+ *
+ * `actual` is null for conditions with no scale -- a flag is set or it is not,
+ * and "Current: 0" would be a lie about a boolean.
+ */
+interface ConditionEvaluation {
+  met: boolean;
+  actual: number | null;
+}
+
 export interface ConditionOutcome {
   condition: GameCondition;
   met: boolean;
+  actual: number | null;
 }
 
 /**
@@ -59,7 +71,8 @@ export class GameConditionService {
 
     const scope: RepositoryScope = manager ?? this.dataSource;
     for (const condition of conditions) {
-      if (!(await this.evaluateOne(context, condition, scope))) {
+      const evaluation = await this.evaluateOne(context, condition, scope);
+      if (!evaluation.met) {
         return false;
       }
     }
@@ -83,9 +96,11 @@ export class GameConditionService {
     const scope: RepositoryScope = manager ?? this.dataSource;
     const outcomes: ConditionOutcome[] = [];
     for (const condition of conditions) {
+      const evaluation = await this.evaluateOne(context, condition, scope);
       outcomes.push({
         condition,
-        met: await this.evaluateOne(context, condition, scope),
+        met: evaluation.met,
+        actual: evaluation.actual,
       });
     }
     return outcomes;
@@ -95,9 +110,9 @@ export class GameConditionService {
     context: ConditionContext,
     condition: GameCondition,
     scope: RepositoryScope,
-  ): Promise<boolean> {
+  ): Promise<ConditionEvaluation> {
     if (!SUPPORTED_CONDITION_TYPES.has(condition.type)) {
-      return false;
+      return { met: false, actual: null };
     }
 
     switch (condition.type) {
@@ -110,7 +125,7 @@ export class GameConditionService {
       case GameConditionType.HAS_ITEM:
         return this.evaluateHasItem(context, condition, scope);
       default:
-        return false;
+        return { met: false, actual: null };
     }
   }
 
@@ -118,16 +133,16 @@ export class GameConditionService {
     context: ConditionContext,
     condition: GameCondition,
     scope: RepositoryScope,
-  ): Promise<boolean> {
+  ): Promise<ConditionEvaluation> {
     if (!condition.key) {
-      return false;
+      return { met: false, actual: null };
     }
 
     const faction = await scope
       .getRepository(ReputationFaction)
       .findOneBy({ key: condition.key, enabled: true });
     if (!faction) {
-      return false;
+      return { met: false, actual: null };
     }
 
     const row = await scope.getRepository(CharacterReputation).findOneBy({
@@ -137,32 +152,39 @@ export class GameConditionService {
 
     // A faction the character never interacted with reads as 0, not as absent
     // -- the same rule ReputationService.getCharacterReputation applies.
-    return this.compareNumeric(row?.reputation ?? 0, condition);
+    const reputation = row?.reputation ?? 0;
+    return {
+      met: this.compareNumeric(reputation, condition),
+      actual: reputation,
+    };
   }
 
   private async evaluateWorldRenown(
     context: ConditionContext,
     condition: GameCondition,
     scope: RepositoryScope,
-  ): Promise<boolean> {
+  ): Promise<ConditionEvaluation> {
     const character = await scope
       .getRepository(Character)
       .findOneBy({ id: context.characterId });
     if (!character) {
-      return false;
+      return { met: false, actual: null };
     }
-    return this.compareNumeric(character.renown, condition);
+    return {
+      met: this.compareNumeric(character.renown, condition),
+      actual: character.renown,
+    };
   }
 
   private async evaluateFlag(
     context: ConditionContext,
     condition: GameCondition,
     scope: RepositoryScope,
-  ): Promise<boolean> {
+  ): Promise<ConditionEvaluation> {
     // Flags are per-NPC player state (spec §7). Without an NPC in context
     // there is nothing to read, so the gate stays shut.
     if (!condition.key || !context.npcId) {
-      return false;
+      return { met: false, actual: null };
     }
 
     const state = await scope.getRepository(CharacterNpcState).findOneBy({
@@ -171,23 +193,26 @@ export class GameConditionService {
     });
 
     const expected = condition.value ?? true;
-    return (state?.flags?.[condition.key] ?? false) === expected;
+    return {
+      met: (state?.flags?.[condition.key] ?? false) === expected,
+      actual: null,
+    };
   }
 
   private async evaluateHasItem(
     context: ConditionContext,
     condition: GameCondition,
     scope: RepositoryScope,
-  ): Promise<boolean> {
+  ): Promise<ConditionEvaluation> {
     if (!condition.key) {
-      return false;
+      return { met: false, actual: null };
     }
 
     const definition = await scope
       .getRepository(ItemDefinition)
       .findOneBy({ key: condition.key });
     if (!definition) {
-      return false;
+      return { met: false, actual: null };
     }
 
     const owned = await scope.getRepository(CharacterItem).findOneBy({
@@ -196,11 +221,15 @@ export class GameConditionService {
     });
 
     // "Has item" without an explicit comparison means "at least one".
-    return this.compareNumeric(owned?.quantity ?? 0, {
-      ...condition,
-      operator: condition.operator ?? ComparisonOperator.GTE,
-      value: condition.value ?? 1,
-    });
+    const quantity = owned?.quantity ?? 0;
+    return {
+      met: this.compareNumeric(quantity, {
+        ...condition,
+        operator: condition.operator ?? ComparisonOperator.GTE,
+        value: condition.value ?? 1,
+      }),
+      actual: quantity,
+    };
   }
 
   private compareNumeric(actual: number, condition: GameCondition): boolean {