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

A farming game

import { cropLifeStage, fertilizerType } from '../../enums.js'
import { FERTILIZER_BONUS } from '../../constants.js'
import { itemsMap } from '../../data/maps.js'
import { getFruitLifeStage } from '../../utils/getFruitLifeStage.js'
import { getTreeLifeStage } from '../../utils/getTreeLifeStage.js'
import { isPlantedTree } from '../../utils/isPlantedTree.js'
import { FRUIT_READY_TO_HARVEST } from '../../templates.js'

const { GROWN } = cropLifeStage
const { NONE, RAINBOW } = fertilizerType

const incrementTreeAge = (
  plotContent: farmhand.plantedTree | farmhand.forestForageable | null
): farmhand.plantedTree | farmhand.forestForageable | null => {
  if (!plotContent) return null

  const daysOld = plotContent.daysOld + 1

  if (!isPlantedTree(plotContent)) {
    return { ...plotContent, daysOld }
  }

  const isFertilized =
    plotContent.fertilizerType != null && plotContent.fertilizerType !== NONE
  const isRainbowFertilized = plotContent.fertilizerType === RAINBOW

  // daysGrown tracks growth progress separately from daysOld - fertilizer
  // accelerates it, but daysOld (used for lifespan/death elsewhere) always
  // advances at the normal rate regardless of fertilizer.
  const daysGrown =
    (plotContent.daysGrown ?? plotContent.daysOld) +
    (isFertilized ? 1 + FERTILIZER_BONUS : 1)

  const updated = { ...plotContent, daysOld, daysGrown }

  // The fruit cycle doesn't start advancing until the tree itself has
  // reached its permanent grown state. Rainbow fertilizer also speeds up
  // fruit regrowth; standard fertilizer only speeds up the initial growth
  // phase above.
  return {
    ...updated,
    daysSinceLastHarvest:
      getTreeLifeStage(updated) === GROWN
        ? updated.daysSinceLastHarvest +
          (isRainbowFertilized ? 1 + FERTILIZER_BONUS : 1)
        : updated.daysSinceLastHarvest,
  }
}

export const processForest = (state: farmhand.state): farmhand.state => {
  const forest = state.forest.map(row => row.map(incrementTreeAge))
  const fruitReady: Record<string, number> = {}

  forest.forEach((row, y) =>
    row.forEach((after, x) => {
      const before = state.forest[y]?.[x]

      if (
        !isPlantedTree(before) ||
        !isPlantedTree(after) ||
        getFruitLifeStage(before) === GROWN ||
        getFruitLifeStage(after) !== GROWN
      ) {
        return
      }

      const { name } = itemsMap[after.itemId] ?? {}

      if (name) {
        fruitReady[name] = (fruitReady[name] || 0) + 1
      }
    })
  )

  const newDayNotifications = [...state.newDayNotifications]

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

  return { ...state, forest, newDayNotifications }
}