Validate RoM primary five hybrid stats and pair mechanics

src/game/wotlkStats.ts

@@ -114,6 +114,42 @@ const RACE_DBC = Object.fromEntries(RACES.map((entry) => [entry.id, entry.dbcId]
 
 const classUsesMana = (classId: ClassId): boolean => classById(classId).resourceSummary.includes("Mana");
 
+/** The five playable RoM pairs use Wrath base curves alongside their hybrid heirlooms. */
+const ROM_HYBRID_BASE_RACE: Partial<Readonly<Record<ClassId, RaceId>>> = Object.freeze({
+  "rom-knight": "human",
+  "rom-priest": "human",
+  "rom-scout": "night-elf",
+  "rom-rogue": "human",
+  // Dwarf Mage was not a 3.3.5 race/class combination; Human supplies its class curve.
+  "rom-mage": "human",
+});
+
+function romHybridBase(
+  classId: ClassId,
+  secondaryClassId: ClassId | null | undefined,
+  level: number,
+): { readonly attributes: PrimaryAttributes; readonly resources: { readonly health: number; readonly mana: number } } | null {
+  const race = ROM_HYBRID_BASE_RACE[classId];
+  if (!race) return null;
+  const primaryAttributes = baseAttributesFor(classId, level, race);
+  const primaryResources = baseResourcesFor(classId, level);
+  const secondary = level >= 10 && secondaryClassId && isRomClassId(secondaryClassId)
+    ? secondaryClassId : null;
+  const secondaryAttributes = secondary
+    ? baseAttributesFor(secondary, level, ROM_HYBRID_BASE_RACE[secondary] ?? "human") : null;
+  const secondaryResources = secondary ? baseResourcesFor(secondary, level) : null;
+  const attributes = Object.fromEntries((Object.keys(primaryAttributes) as (keyof PrimaryAttributes)[]).map((key) => [
+    key, primaryAttributes[key] + (secondaryAttributes?.[key] ?? 0) * .1,
+  ])) as unknown as PrimaryAttributes;
+  return {
+    attributes,
+    resources: {
+      health: primaryResources.health + (secondaryResources?.health ?? 0) * .1,
+      mana: primaryResources.mana + (secondaryResources?.mana ?? 0) * .1,
+    },
+  };
+}
+
 /**
  * Automatic racial auras from Ascension's effective Spell.dbc that can change
  * a character's starting attributes or resource pools.
@@ -259,15 +295,16 @@ export function deriveCharacterStats(
   secondaryClassId?: ClassId | null,
 ): CharacterStats {
   const safe = safeLevel(level);
-  const romBase = romDualClassBaseStats(classId, secondaryClassId, safe);
-  const base = romBase ? {
+  const hybridBase = romHybridBase(classId, secondaryClassId, safe);
+  const romBase = hybridBase ? null : romDualClassBaseStats(classId, secondaryClassId, safe);
+  const base = hybridBase?.attributes ?? (romBase ? {
     strength: romBase.strength,
     agility: romBase.agility,
     stamina: romBase.stamina,
     intellect: romBase.intellect,
     spirit: romBase.wisdom,
-  } : baseAttributesFor(classId, safe, raceId);
-  const resources = romBase ? { health: romBase.health, mana: romBase.mana } : baseResourcesFor(classId, safe);
+  } : baseAttributesFor(classId, safe, raceId));
+  const resources = hybridBase?.resources ?? (romBase ? { health: romBase.health, mana: romBase.mana } : baseResourcesFor(classId, safe));
   const racial = RACIAL_STAT_PASSIVES[raceId];
   const strength = percentAdjusted(base.strength + gear.strength, racial?.strength, modifiers.strength);
   const agility = percentAdjusted(base.agility + gear.agility, racial?.agility, modifiers.agility);