add local production bonuses

src/data/cityBonuses.ts

@@ -0,0 +1,55 @@
+import type { AlbionCity } from '../types/api'
+
+// Source: Albion Online Wiki — Production Bonuses
+// Formula: RRR% = (1 - 1 / (1 + LPB/100)) × 100
+//
+// Royal cities base LPB:       18%  →  RRR ≈ 15.3%
+// Specialization bonus:       +15%  →  total 33% LPB  →  RRR ≈ 24.8%
+// Black Market (not a crafting location): 0% LPB → RRR = 0%
+
+const BASE_ROYAL_LPB      = 18
+const SPECIALIZATION_BONUS = 15
+
+const ROYAL_CITIES = new Set<AlbionCity>([
+  'Fort Sterling', 'Lymhurst', 'Bridgewatch', 'Martlock', 'Thetford', 'Caerleon',
+])
+
+// Each regex matches all output item IDs that receive the +15% specialization bonus
+// in that city, including artifact / avalon / crystal variants.
+const SPECIALIZATION_PATTERNS: Partial<Record<AlbionCity, RegExp>> = {
+  'Fort Sterling': /_MAIN_HAMMER|_2H_HAMMER|_2H_POLEHAMMER|_2H_DUALHAMMER|_2H_RAM_|_MAIN_SPEAR|_2H_SPEAR|_2H_GLAIVE|_2H_HARPOON|_2H_TRIDENT|_HOLYSTAFF|_DIVINESTAFF|_HEAD_PLATE_|_ARMOR_CLOTH_/,
+  'Lymhurst':      /_MAIN_SWORD|_2H_CLAYMORE|_2H_DUALSWORD|_SCIMITAR|_2H_CLEAVER|_2H_BOW|_LONGBOW|_WARBOW|_ARCANESTAFF|_ENIGMATICSTAFF|_ENIGMATICORB|_ARCANE_RINGPAIR|_HEAD_LEATHER_|_SHOES_LEATHER_/,
+  'Bridgewatch':   /_CROSSBOW|_1HCROSSBOW|_DAGGER|_CLAWPAIR|_RAPIER|_DUALSICKLE|_CURSEDSTAFF|_DEMONICSTAFF|_SKULLORB|_ARMOR_PLATE_|_SHOES_CLOTH_/,
+  'Martlock':      /_MAIN_AXE|_2H_AXE|_2H_HALBERD|_2H_SCYTHE|_2H_DUALAXE|_QUARTERSTAFF|_IRONCLADEDSTAFF|_DOUBLEBLADEDSTAFF|_COMBATSTAFF|_TWINSCYTHE|_ROCKSTAFF|_FROSTSTAFF|_GLACIALSTAFF|_ICEGAUNTLETS|_ICECRYSTAL|_SHOES_PLATE_|_OFF_/,
+  'Thetford':      /_MAIN_MACE|_2H_MACE|_2H_FLAIL|_ROCKMACE|_2H_DUALMACE|_NATURESTAFF|_WILDSTAFF|_FIRESTAFF|_INFERNOSTAFF|_FIRE_RINGPAIR|_ARMOR_LEATHER_|_HEAD_CLOTH_/,
+  'Caerleon':      /_2H_KNUCKLES|_SHAPESHIFTER|_2H_TOOL_/,
+}
+
+// Returns the Local Production Bonus (%) for crafting this item in the given city.
+export function localProductionBonus(city: AlbionCity, outputItemId: string): number {
+  if (!ROYAL_CITIES.has(city)) return 0  // Black Market: no bonus
+
+  const pattern = SPECIALIZATION_PATTERNS[city]
+  const baseId = outputItemId.replace(/@\d$/, '') // strip enchantment suffix
+  const isSpecialized = pattern ? pattern.test(baseId) : false
+
+  return BASE_ROYAL_LPB + (isSpecialized ? SPECIALIZATION_BONUS : 0)
+}
+
+// Converts a Local Production Bonus (%) to the resulting Resource Return Rate (%).
+// Formula: RRR = 1 - 1/(1 + LPB/100)
+export function rrrFromBonus(lpb: number): number {
+  if (lpb === 0) return 0
+  return (1 - 1 / (1 + lpb / 100)) * 100
+}
+
+// Returns the effective RRR (%) for crafting this item in the given city.
+export function cityRrr(city: AlbionCity, outputItemId: string): number {
+  return rrrFromBonus(localProductionBonus(city, outputItemId))
+}
+
+// Returns true for ingredients that are NOT subject to RRR (artefacts, ALCHEMY_RARE).
+// Only basic resources (bars, planks, leather, cloth) are returned by the city bonus.
+export function isRrrExempt(itemId: string): boolean {
+  return itemId.includes('_ARTEFACT_') || itemId.includes('_ALCHEMY_RARE_')
+}