feat: introduce mnie

packages/client-sbi/src/markets.ts

@@ -0,0 +1,53 @@
+import type { MarketCode } from './types'
+
+export type MarketRegion = 'domestic' | 'us'
+
+const DOMESTIC_TO_MTS = {
+  XTKS: 'TKY',
+  XNGO: 'NGY',
+  XFKA: 'FKO',
+  XSAP: 'SPR',
+} as const satisfies Record<string, string>
+
+const MTS_TO_DOMESTIC = Object.fromEntries(
+  Object.entries(DOMESTIC_TO_MTS).map(([mic, mts]) => [mts, mic]),
+) as Record<string, MarketCode>
+
+const US_MARKETS = new Set<MarketCode>(['XNAS', 'XNYS', 'ARCX'])
+
+export const marketRegion = (market: MarketCode | undefined, methodName: string): MarketRegion => {
+  if (!market) throw new Error(`${methodName} requires market`)
+  if (market in DOMESTIC_TO_MTS) return 'domestic'
+  if (market === 'STK') return 'domestic'
+  if (US_MARKETS.has(market)) return 'us'
+  throw new Error(`${methodName} does not support market: ${market}`)
+}
+
+export const isUsMarket = (market: MarketCode | undefined) =>
+  market != null && US_MARKETS.has(market)
+
+export const domesticMarketToMts = (market: MarketCode | undefined, methodName: string) => {
+  if (!market) throw new Error(`${methodName} requires market`)
+  const mts = DOMESTIC_TO_MTS[market as keyof typeof DOMESTIC_TO_MTS]
+  if (!mts) throw new Error(`${methodName} does not support domestic market: ${market}`)
+  return mts
+}
+
+export const mtsMarketToDomestic = (market: string | undefined): MarketCode | undefined => {
+  if (!market) return undefined
+  return MTS_TO_DOMESTIC[market]
+}
+
+export const requireDomesticMarket = (market: MarketCode | undefined, methodName: string) => {
+  const region = marketRegion(market, methodName)
+  if (region !== 'domestic') {
+    throw new Error(`${methodName} supports only domestic markets`)
+  }
+}
+
+export const requireUsMarket = (market: MarketCode | undefined, methodName: string) => {
+  const region = marketRegion(market, methodName)
+  if (region !== 'us') {
+    throw new Error(`${methodName} supports only US stock markets`)
+  }
+}