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

A farming game

import { doesInventorySpaceRemain } from '../../utils/doesInventorySpaceRemain.js'
import { getCowMilkItem } from '../../utils/getCowMilkItem.js'
import { getCowMilkRate } from '../../utils/getCowMilkRate.js'
import { MILKS_PRODUCED } from '../../templates.js'

import { addItemToInventory } from './addItemToInventory.js'

export const processMilkingCows = (state: farmhand.state): farmhand.state => {
  const cowInventory = [...state.cowInventory]
  const newDayNotifications = [...state.newDayNotifications]
  const { length: cowInventoryLength } = cowInventory
  const milksProduced: Record<string, number> = {}

  for (let i = 0; i < cowInventoryLength; i++) {
    const cow = cowInventory[i]

    if (cow.daysSinceMilking > getCowMilkRate(cow)) {
      cowInventory[i] = { ...cow, daysSinceMilking: 0 }

      const milk = getCowMilkItem(cow as any)
      const { name } = milk

      if (!doesInventorySpaceRemain(state)) {
        break
      }

      milksProduced[name] = (milksProduced[name] || 0) + 1
      state = addItemToInventory(state, milk)
    }
  }

  if (Object.keys(milksProduced).length) {
    newDayNotifications.push({
      message: MILKS_PRODUCED('', milksProduced),
      severity: 'success',
    })
  }

  return { ...state, cowInventory, newDayNotifications }
}