feat(core-flows,pricing,medusa,pricing,types,utils): Price List Prices can have their own rules (#5752)

**What**
- Add price-rules for prices in price-lists
- make rules object optional when creating prices

**Why**
- more price granularity

Co-authored-by: Philip Korsholm <88927411+pKorsholm@users.noreply.github.com>

packages/core-flows/src/handlers/price-list/prepare-create-price-list.ts

@@ -16,6 +16,7 @@ export async function prepareCreatePriceLists({
   })[]
 }>): Promise<Result | void> {
   const remoteQuery = container.resolve("remoteQuery")
+  const regionService = container.resolve("regionService")
 
   const { price_lists } = data
 
@@ -59,6 +60,17 @@ export async function prepareCreatePriceLists({
     )
   }
 
+  const regionIds = price_lists
+    .map(({ prices }) => prices?.map((price) => price.region_id) ?? [])
+    .flat(2)
+  const regions = await regionService.list({ id: regionIds }, {})
+  const regionIdCurrencyCodeMap: Map<string, string> = new Map(
+    regions.map((region: { id: string; currency_code: string }) => [
+      region.id,
+      region.currency_code,
+    ])
+  )
+
   return price_lists.map((priceListDTO) => {
     priceListDTO.title ??= priceListDTO.name
     const { _associationTag, name, prices, ...rest } = priceListDTO
@@ -70,12 +82,20 @@ export async function prepareCreatePriceLists({
       prices?.map((price) => {
         const price_set_id = variantIdPriceSetIdMap.get(price.variant_id)!
 
+        const rules: Record<string, string> = {}
+        if (price.region_id) {
+          rules.region_id = price.region_id
+        }
+
         return {
-          currency_code: price.currency_code,
+          currency_code:
+            regionIdCurrencyCodeMap.get(price.region_id as string) ??
+            (price.currency_code as string),
           amount: price.amount,
           min_quantity: price.min_quantity,
           max_quantity: price.max_quantity,
           price_set_id,
+          rules,
         }
       }) ?? []
 

packages/core-flows/src/handlers/price-list/prepare-update-price-lists.ts

@@ -18,6 +18,7 @@ export async function prepareUpdatePriceLists({
 }>): Promise<Result> {
   const { price_lists: priceListsData } = data
   const remoteQuery = container.resolve("remoteQuery")
+  const regionService = container.resolve("regionService")
 
   const variantPriceSetMap = new Map<string, string>()
   const priceListPricesMap = new Map<string, PriceListPriceDTO[]>()
@@ -44,6 +45,17 @@ export async function prepareUpdatePriceLists({
     variantPriceSetMap.set(variant_id, price_set_id)
   }
 
+  const regionIds = priceListsData
+    .map(({ prices }) => prices?.map((price) => price.region_id) ?? [])
+    .flat(2)
+  const regions = await regionService.list({ id: regionIds })
+  const regionsMap: Map<string, string> = new Map(
+    regions.map((region: { id: string; currency_code: string }) => [
+      region.id,
+      region.currency_code,
+    ])
+  )
+
   const priceLists = priceListsData.map((priceListData) => {
     const priceListPrices: PriceListPriceDTO[] = []
 
@@ -53,13 +65,21 @@ export async function prepareUpdatePriceLists({
         return
       }
 
+      const rules: Record<string, string> = {}
+      if (price.region_id) {
+        rules.region_id = price.region_id
+      }
+
       priceListPrices.push({
         id: priceData.id,
         price_set_id: variantPriceSetMap.get(variant_id) as string,
-        currency_code: priceData.currency_code as string,
+        currency_code:
+          regionsMap.get(priceData.region_id as string) ??
+          (priceData.currency_code as string),
         amount: priceData.amount,
         min_quantity: priceData.min_quantity,
         max_quantity: priceData.max_quantity,
+        rules,
       })
 
       return

packages/core-flows/src/handlers/product/update-products-variants-prices.ts

@@ -65,7 +65,6 @@ export async function updateProductsVariantsPrices({
         const obj = {
           amount: price.amount,
           currency_code: price.currency_code,
-          rules: {},
         }
 
         if (price.region_id) {