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import type { MutableRefObject } from 'react'
import type { NumberLineState } from './types'
import type { RenderTarget } from './renderNumberLine'
import { computeProximity } from './findTheNumber/computeProximity'
import type { ProximityZone, ProximityResult } from './findTheNumber/computeProximity'
import type { FindTheNumberGameState } from './findTheNumber/FindTheNumberBar'
import { useFindTheNumberAudio } from './findTheNumber/useFindTheNumberAudio'
function getTargetPrecisionForHint(target: number): number {
if (Number.isInteger(target)) return 0
const str = target.toString()
const dot = str.indexOf('.')
if (dot === -1) return 0
return Math.min(str.slice(dot + 1).length, 6)
}
function formatApprox(n: number): string {
if (Math.abs(n) >= 100) return String(Math.round(n))
if (Math.abs(n) >= 10) return String(Math.round(n * 10) / 10)
return String(Math.round(n * 100) / 100)
}
const GAME_EMOJIS = ['⭐', '🚀', '💎', '🦄', '🌈', '🎯', '🔥', '🌸', '🐙', '🍕', '🎪', '🪐']
interface UseFindTheNumberGameOptions {
stateRef: MutableRefObject<NumberLineState>
cssWidthRef: MutableRefObject<number>
drawRef: MutableRefObject<() => void>
voiceState: string
sendSystemMessage: (msg: string, force?: boolean) => void
setActiveGameId: (id: string | null) => void
startFindNumberFnRef: MutableRefObject<(target: number) => void>
stopFindNumberFnRef: MutableRefObject<() => void>
}
export function useFindTheNumberGame({
stateRef,
cssWidthRef,
drawRef,
voiceState,
sendSystemMessage,
setActiveGameId,
startFindNumberFnRef,
stopFindNumberFnRef,
}: UseFindTheNumberGameOptions) {
const [gameState, setGameState] = useState<FindTheNumberGameState>('idle')
const targetRef = useRef<{ value: number; emoji: string } | null>(null)
const gameStateRef = useRef<FindTheNumberGameState>('idle')
gameStateRef.current = gameState
const [audioZone, setAudioZone] = useState<ProximityZone | null>(null)
const prevGameZoneRef = useRef<ProximityZone | null>(null)
const proximityRef = useRef<ProximityResult | null>(null)
const renderTargetRef = useRef<RenderTarget | undefined>(undefined)
const labelScaleRef = useRef(1)
const labelMinOpacityRef = useRef(0)
const [gameStartedByModel, setGameStartedByModel] = useState(false)
const gameStartedByModelRef = useRef(false)
const gameRafRef = useRef<number>(0)
// Called from parent's draw() to compute game proximity each frame
const computeGameProximity = useCallback(() => {
const target = targetRef.current
let renderTarget: RenderTarget | undefined
if (target && gameStateRef.current === 'active') {
const prox = computeProximity(target.value, stateRef.current, cssWidthRef.current)
renderTarget = { value: target.value, emoji: target.emoji, opacity: prox.opacity }
proximityRef.current = prox
if (prox.zone !== prevGameZoneRef.current) {
prevGameZoneRef.current = prox.zone
setAudioZone(prox.zone)
}
if (prox.zone === 'found') {
setGameState('found')
}
} else if (target && gameStateRef.current === 'found') {
const prox = computeProximity(target.value, stateRef.current, cssWidthRef.current)
renderTarget = {
value: target.value,
emoji: target.emoji,
opacity: Math.max(prox.opacity, 0.9),
}
}
renderTargetRef.current = renderTarget
}, [stateRef, cssWidthRef])
// Game loop: continuous redraw while game is active
useEffect(() => {
if (gameState !== 'active') {
if (gameRafRef.current) {
cancelAnimationFrame(gameRafRef.current)
gameRafRef.current = 0
}
return
}
const tick = () => {
drawRef.current()
gameRafRef.current = requestAnimationFrame(tick)
}
gameRafRef.current = requestAnimationFrame(tick)
return () => {
if (gameRafRef.current) {
cancelAnimationFrame(gameRafRef.current)
gameRafRef.current = 0
}
}
// drawRef is stable (a ref), gameState triggers the effect
// eslint-disable-next-line react-hooks/exhaustive-deps
}, [gameState])
const handleGameStart = useCallback(
(target: number, emoji: string) => {
targetRef.current = { value: target, emoji }
prevGameZoneRef.current = null
proximityRef.current = null
setAudioZone(null)
setGameState('active')
setActiveGameId('find_number')
drawRef.current()
},
[drawRef, setActiveGameId]
)
const handleGameGiveUp = useCallback(() => {
targetRef.current = null
prevGameZoneRef.current = null
proximityRef.current = null
renderTargetRef.current = undefined
setAudioZone(null)
setGameState('idle')
setActiveGameId(null)
drawRef.current()
}, [drawRef, setActiveGameId])
// Wire forward refs for voice-model-initiated games
startFindNumberFnRef.current = (target: number) => {
const emoji = GAME_EMOJIS[Math.floor(Math.random() * GAME_EMOJIS.length)]
gameStartedByModelRef.current = true
setGameStartedByModel(true)
handleGameStart(target, emoji)
}
stopFindNumberFnRef.current = () => {
gameStartedByModelRef.current = false
setGameStartedByModel(false)
handleGameGiveUp()
}
// Push game lifecycle events to the voice model
const prevGameStateForVoiceRef = useRef<FindTheNumberGameState>('idle')
useEffect(() => {
const prev = prevGameStateForVoiceRef.current
prevGameStateForVoiceRef.current = gameState
if (voiceState !== 'active') return
if (gameState === 'active' && prev !== 'active' && !gameStartedByModelRef.current) {
const target = targetRef.current?.value
if (target !== undefined) {
sendSystemMessage(
`[Game update: The child started a find-the-number game! Target: ${target}. Give verbal hints about the number's neighborhood and properties. Say "higher numbers"/"lower numbers" for direction — NEVER "left"/"right". Instead of "zoom in", hint at precision: "it has a decimal", "between 3 and 4". You will receive proximity updates.]`
)
}
}
if (gameState === 'idle' && prev !== 'idle' && !gameStartedByModelRef.current) {
sendSystemMessage('[Game update: The child ended the find-the-number game.]')
}
if (gameState === 'idle') {
gameStartedByModelRef.current = false
setGameStartedByModel(false)
}
}, [gameState, voiceState, sendSystemMessage])
// Push proximity zone updates to the voice model
const prevAudioZoneForVoiceRef = useRef<ProximityZone | null>(null)
useEffect(() => {
const prev = prevAudioZoneForVoiceRef.current
prevAudioZoneForVoiceRef.current = audioZone
if (voiceState !== 'active' || audioZone === null) return
if (audioZone === prev) return
const target = targetRef.current?.value
if (target === undefined) return
if (audioZone === 'found') {
sendSystemMessage('[Game update: The child found the number! Celebrate with them!]', true)
} else {
const prox = proximityRef.current
const { center, pixelsPerUnit } = stateRef.current
const halfRange = cssWidthRef.current / (2 * pixelsPerUnit)
const viewLeft = center - halfRange
const viewRight = center + halfRange
const dir = prox?.targetDirection
const dirHint =
dir === 'left'
? "The target is at a LOWER number than what's on screen — the child needs to move toward smaller numbers (scroll left)."
: dir === 'right'
? "The target is at a HIGHER number than what's on screen — the child needs to move toward bigger numbers (scroll right)."
: 'The target is somewhere on screen right now.'
const dist = Math.abs(target - center)
const distHint =
dist > 100
? `About ${Math.round(dist)} away from where the child is looking.`
: dist > 10
? `Roughly ${Math.round(dist)} units away.`
: dist > 1
? `Only about ${Math.round(dist * 10) / 10} away — getting close!`
: `Very close — less than 1 unit away!`
let precisionHint = ''
if (prox?.needsMoreZoom) {
const precision = getTargetPrecisionForHint(target)
if (precision >= 2) {
precisionHint =
' The target has hundredths-level precision — the child needs to zoom in enough to see individual hundredths (like 3.14 vs 3.15).'
} else if (precision === 1) {
precisionHint =
' The target has a decimal digit — the child needs to zoom in enough to see tenths (like 2.3 vs 2.4).'
} else {
precisionHint = ' The child needs to zoom in a bit more to spot the exact number.'
}
}
const viewHint = `The child is currently looking at numbers from about ${formatApprox(viewLeft)} to ${formatApprox(viewRight)}.`
sendSystemMessage(
`[Game update: zone=${audioZone}. ${viewHint} ${dirHint} ${distHint}${precisionHint}\n` +
`IMPORTANT: Say "lower numbers" or "higher numbers" when giving direction hints, NOT "left" or "right" — children often confuse screen directions. ` +
`Instead of telling the child to "zoom in", give them useful hints about the number's neighborhood — for example, "it's between 30 and 40" or "think about multiples of 5". ` +
`Let their curiosity guide them!]`
)
}
}, [audioZone, voiceState, sendSystemMessage, stateRef, cssWidthRef])
// Audio feedback (muted during active voice calls)
useFindTheNumberAudio(audioZone, proximityRef, voiceState === 'active')
return {
gameState,
renderTargetRef,
proximityRef,
handleGameStart,
handleGameGiveUp,
computeGameProximity,
gameStartedByModel,
labelScaleRef,
labelMinOpacityRef,
gameRafRef,
}
}
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