import { Request, Receipt, InvalidOrder, CatalogFailure, StoreFailure, Catalog, Store } from "./contracts.eff"
import { StoreLive, Runtime } from "host:store"

const requestSchema: Schema<Request> = schema()
const storageRetry: RetrySchedule<StoreFailure> =
  retrySchedule((error, attempt) =>
    if (error.kind === "Transient" && attempt <= 2) { Some(attempt * 5) } else { None })

export const submit = (input: unknown): Receipt
  fails SchemaError | InvalidOrder | CatalogFailure | StoreFailure
  uses Catalog.price | Runtime.database => {
    const request = schemaDecode(requestSchema, input)
    if (request.sku === "" || request.quantity < 1 || request.quantity > 100) {
      fail(InvalidOrder({ reason: "request" }))
    } else {
      const unitPrice = Catalog.price(request.sku)
      if (unitPrice < 0 || unitPrice > 100000) {
        fail(InvalidOrder({ reason: "price" }))
      } else {
        const order = { sku: request.sku, quantity: request.quantity, total: unitPrice * request.quantity }
        provide(StoreLive, () => retry(() => Store.save(order), { schedule: storageRetry }))
      }
    }
  }