@jeremyckahn/farmhand/src/game-logic/reducers/purchaseComposter.ts

A farming game

import { moneyTotal } from '../../utils/moneyTotal.js'
import { EXPERIENCE_VALUES, PURCHASEABLE_COMPOSTERS } from '../../constants.js'
import { RECYCLING_AVAILABLE_NOTIFICATION } from '../../strings.js'

import { addExperience } from './addExperience.js'
import { showNotification } from './showNotification.js'
import { updateLearnedRecipes } from './updateLearnedRecipes.js'

export const purchaseComposter = (
  state: farmhand.state,
  composterId: number
): farmhand.state => {
  const { money, purchasedComposter } = state

  if (purchasedComposter >= composterId) return state

  state = {
    ...state,
    purchasedComposter: composterId,
    money: moneyTotal(
      money,
      -(PURCHASEABLE_COMPOSTERS.get(composterId)?.price ?? 0)
    ),
  }

  state = showNotification(state, RECYCLING_AVAILABLE_NOTIFICATION)
  state = addExperience(state, EXPERIENCE_VALUES.COMPOSTER_ACQUIRED)

  return updateLearnedRecipes(state)
}