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import { useCallback, useEffect, useMemo, useReducer, useRef } from 'react'
import type { SlotResult } from '@/db/schema/session-plans'
import {
type AutoPauseStats,
calculateAutoPauseInfo,
calculateComplexityScaledThresholds,
calculateNormalizedResponseTimeStats,
getComplexityCost,
type PauseInfo,
type ProgressiveThresholds,
} from '../autoPauseCalculator'
import {
getProgressiveAssistanceTiming,
type ProgressiveAssistanceTimingConfig,
shouldUseDebugTiming,
} from '@/constants/helpTiming'
// =============================================================================
// Types
// =============================================================================
export type AssistanceStateName = 'idle' | 'encouraging' | 'offeringHelp' | 'autoPaused' | 'inHelp'
export interface AssistanceEventLogEntry {
timestamp: number
event: string
fromState: AssistanceStateName
toState: AssistanceStateName
note: string
}
export interface AssistanceContext {
wrongAttemptCount: number
helpedTermIndices: Set<number>
allTermsHelped: boolean
moveOnGraceStartedAt: number | null
moveOnAvailable: boolean
idleStartedAt: number
thresholds: ProgressiveThresholds
autoPauseStats: AutoPauseStats | null
wrongAnswerThreshold: number
moveOnGraceMs: number
eventLog: AssistanceEventLogEntry[]
}
export interface AssistanceMachineState {
state: AssistanceStateName
context: AssistanceContext
}
export type AssistanceEvent =
| { type: 'TIMER_ENCOURAGEMENT' }
| { type: 'TIMER_HELP_OFFER' }
| { type: 'TIMER_AUTO_PAUSE'; autoPauseStats: AutoPauseStats }
| { type: 'TIMER_MOVE_ON_GRACE' }
| { type: 'DIGIT_TYPED' }
| { type: 'WRONG_ANSWER' }
| { type: 'HELP_ENTERED' }
| { type: 'HELP_TERM_COMPLETED'; termIndex: number }
| { type: 'HELP_EXITED'; problemTermsCount: number }
| { type: 'RESUMED' }
| { type: 'PROBLEM_CHANGED' }
| { type: 'DISMISS_WRONG_ANSWER_SUGGESTION' }
| { type: 'UPDATE_THRESHOLDS'; thresholds: ProgressiveThresholds }
// =============================================================================
// Constants
// =============================================================================
const MAX_EVENT_LOG_SIZE = 30
// =============================================================================
// Pure Reducer
// =============================================================================
export function createFreshContext(
thresholds: ProgressiveThresholds,
wrongAnswerThreshold: number,
moveOnGraceMs: number
): AssistanceContext {
return {
wrongAttemptCount: 0,
helpedTermIndices: new Set(),
allTermsHelped: false,
moveOnGraceStartedAt: null,
moveOnAvailable: false,
idleStartedAt: Date.now(),
thresholds,
autoPauseStats: null,
wrongAnswerThreshold,
moveOnGraceMs,
eventLog: [],
}
}
function resetContext(ctx: AssistanceContext): AssistanceContext {
return {
...ctx,
wrongAttemptCount: 0,
helpedTermIndices: new Set(),
allTermsHelped: false,
moveOnGraceStartedAt: null,
moveOnAvailable: false,
idleStartedAt: Date.now(),
autoPauseStats: null,
}
}
function appendLog(
ctx: AssistanceContext,
event: string,
fromState: AssistanceStateName,
toState: AssistanceStateName,
note: string
): AssistanceEventLogEntry[] {
const entry: AssistanceEventLogEntry = {
timestamp: Date.now(),
event,
fromState,
toState,
note,
}
const log = [entry, ...ctx.eventLog]
if (log.length > MAX_EVENT_LOG_SIZE) {
log.length = MAX_EVENT_LOG_SIZE
}
return log
}
export function assistanceReducer(
machine: AssistanceMachineState,
event: AssistanceEvent
): AssistanceMachineState {
const { state, context } = machine
// UPDATE_THRESHOLDS can happen in any state
if (event.type === 'UPDATE_THRESHOLDS') {
return {
state,
context: {
...context,
thresholds: event.thresholds,
eventLog: appendLog(context, event.type, state, state, 'thresholds updated'),
},
}
}
// PROBLEM_CHANGED always resets to idle from any state
if (event.type === 'PROBLEM_CHANGED') {
const newCtx = resetContext(context)
return {
state: 'idle',
context: {
...newCtx,
eventLog: appendLog(context, event.type, state, 'idle', 'full reset'),
},
}
}
// DISMISS_WRONG_ANSWER_SUGGESTION — reset wrong attempt count
if (event.type === 'DISMISS_WRONG_ANSWER_SUGGESTION') {
return {
state,
context: {
...context,
wrongAttemptCount: 0,
eventLog: appendLog(context, event.type, state, state, 'dismissed'),
},
}
}
switch (state) {
case 'idle': {
switch (event.type) {
case 'TIMER_ENCOURAGEMENT':
return {
state: 'encouraging',
context: {
...context,
eventLog: appendLog(context, event.type, 'idle', 'encouraging', ''),
},
}
case 'DIGIT_TYPED':
return {
state: 'idle',
context: {
...context,
idleStartedAt: Date.now(),
eventLog: appendLog(context, event.type, 'idle', 'idle', 'reset timer'),
},
}
case 'WRONG_ANSWER': {
const newCount = context.wrongAttemptCount + 1
const nextState: AssistanceStateName =
newCount >= context.wrongAnswerThreshold ? 'offeringHelp' : 'idle'
return {
state: nextState,
context: {
...context,
wrongAttemptCount: newCount,
eventLog: appendLog(
context,
event.type,
'idle',
nextState,
`count=${newCount}/${context.wrongAnswerThreshold}`
),
},
}
}
case 'HELP_ENTERED':
return {
state: 'inHelp',
context: {
...context,
eventLog: appendLog(context, event.type, 'idle', 'inHelp', ''),
},
}
case 'TIMER_MOVE_ON_GRACE':
if (context.allTermsHelped) {
return {
state: 'idle',
context: {
...context,
moveOnAvailable: true,
moveOnGraceStartedAt: null,
eventLog: appendLog(context, event.type, 'idle', 'idle', 'moveOn available'),
},
}
}
return machine
default:
return machine
}
}
case 'encouraging': {
switch (event.type) {
case 'TIMER_HELP_OFFER':
return {
state: 'offeringHelp',
context: {
...context,
eventLog: appendLog(context, event.type, 'encouraging', 'offeringHelp', ''),
},
}
case 'DIGIT_TYPED':
return {
state: 'idle',
context: {
...context,
idleStartedAt: Date.now(),
eventLog: appendLog(context, event.type, 'encouraging', 'idle', 'reset timer'),
},
}
case 'HELP_ENTERED':
return {
state: 'inHelp',
context: {
...context,
eventLog: appendLog(context, event.type, 'encouraging', 'inHelp', ''),
},
}
case 'WRONG_ANSWER': {
const newCount = context.wrongAttemptCount + 1
const nextState: AssistanceStateName =
newCount >= context.wrongAnswerThreshold ? 'offeringHelp' : 'encouraging'
return {
state: nextState,
context: {
...context,
wrongAttemptCount: newCount,
eventLog: appendLog(
context,
event.type,
'encouraging',
nextState,
`count=${newCount}/${context.wrongAnswerThreshold}`
),
},
}
}
default:
return machine
}
}
case 'offeringHelp': {
switch (event.type) {
case 'TIMER_AUTO_PAUSE':
return {
state: 'autoPaused',
context: {
...context,
autoPauseStats: event.autoPauseStats,
eventLog: appendLog(context, event.type, 'offeringHelp', 'autoPaused', ''),
},
}
case 'DIGIT_TYPED':
return {
state: 'idle',
context: {
...context,
idleStartedAt: Date.now(),
eventLog: appendLog(context, event.type, 'offeringHelp', 'idle', 'reset timer'),
},
}
case 'HELP_ENTERED':
return {
state: 'inHelp',
context: {
...context,
eventLog: appendLog(context, event.type, 'offeringHelp', 'inHelp', ''),
},
}
default:
return machine
}
}
case 'autoPaused': {
switch (event.type) {
case 'RESUMED':
return {
state: 'idle',
context: {
...context,
idleStartedAt: Date.now(),
eventLog: appendLog(context, event.type, 'autoPaused', 'idle', 'reset timer'),
},
}
default:
return machine
}
}
case 'inHelp': {
switch (event.type) {
case 'HELP_TERM_COMPLETED': {
const newSet = new Set(context.helpedTermIndices)
newSet.add(event.termIndex)
return {
state: 'inHelp',
context: {
...context,
helpedTermIndices: newSet,
eventLog: appendLog(
context,
event.type,
'inHelp',
'inHelp',
`term=${event.termIndex}, helped=${newSet.size}`
),
},
}
}
case 'HELP_EXITED': {
// Determine if all terms have been helped
// Help is for terms at indices 1..n-1 (first term is the starting number)
const helpableTermCount = Math.max(0, event.problemTermsCount - 1)
const allHelped =
helpableTermCount > 0 && context.helpedTermIndices.size >= helpableTermCount
const shouldStartGrace = allHelped && !context.moveOnAvailable
return {
state: 'idle',
context: {
...context,
idleStartedAt: Date.now(),
allTermsHelped: allHelped || context.allTermsHelped,
moveOnGraceStartedAt: shouldStartGrace ? Date.now() : context.moveOnGraceStartedAt,
eventLog: appendLog(
context,
event.type,
'inHelp',
'idle',
allHelped ? 'all terms helped, grace started' : ''
),
},
}
}
case 'DIGIT_TYPED':
return {
state: 'idle',
context: {
...context,
idleStartedAt: Date.now(),
eventLog: appendLog(context, event.type, 'inHelp', 'idle', 'student typed'),
},
}
default:
return machine
}
}
default:
return machine
}
}
// =============================================================================
// Derived Values
// =============================================================================
export function showWrongAnswerSuggestion(
state: AssistanceStateName,
ctx: AssistanceContext
): boolean {
return (
ctx.wrongAttemptCount >= ctx.wrongAnswerThreshold &&
state !== 'inHelp' &&
state !== 'autoPaused'
)
}
// =============================================================================
// Hook
// =============================================================================
export interface UseProgressiveAssistanceInputs {
/** Current attempt (null when loading) */
attempt: {
startTime: number
accumulatedPauseMs: number
problem: {
terms: number[]
generationTrace?: { totalComplexityCost?: number }
}
} | null
/** Historical results for threshold calculation */
results: SlotResult[]
/** Number of terms in current problem */
problemTermsCount: number
/** Whether session is currently paused */
isPaused: boolean
/** Called when auto-pause fires — should pause the session and set pause info */
onAutoPause: (info: PauseInfo) => void
}
export interface UseProgressiveAssistanceReturn {
machineState: AssistanceMachineState
showWrongAnswerSuggestion: boolean
/** True when complexity cost data is missing from the current problem */
complexityCostMissing: boolean
onDigitTyped: () => void
onWrongAnswer: () => void
onHelpEntered: () => void
onHelpTermCompleted: (termIndex: number) => void
onHelpExited: () => void
onResumed: () => void
onProblemChanged: () => void
dismissWrongAnswerSuggestion: () => void
}
export function useProgressiveAssistance(
inputs: UseProgressiveAssistanceInputs
): UseProgressiveAssistanceReturn {
const { attempt, results, problemTermsCount, isPaused, onAutoPause } = inputs
// Determine timing config
const timing = useMemo<ProgressiveAssistanceTimingConfig>(
() => getProgressiveAssistanceTiming(shouldUseDebugTiming()),
[]
)
// Derive complexity cost of the current problem
const currentProblemCost = useMemo(
() => (attempt ? getComplexityCost(attempt.problem) : null),
[attempt?.problem?.generationTrace?.totalComplexityCost] // eslint-disable-line react-hooks/exhaustive-deps
)
const complexityCostMissing = attempt !== null && currentProblemCost === null
// Calculate initial thresholds
const initialThresholds = useMemo(
() => calculateComplexityScaledThresholds(results, timing, currentProblemCost),
// eslint-disable-next-line react-hooks/exhaustive-deps
[] // Only on mount — thresholds update via UPDATE_THRESHOLDS event
)
const [machine, dispatch] = useReducer(assistanceReducer, {
state: 'idle' as AssistanceStateName,
context: createFreshContext(
initialThresholds,
timing.wrongAnswerThreshold,
timing.moveOnGraceMs
),
})
// Update thresholds when results change or current problem cost changes
const prevResultsLengthRef = useRef(results.length)
const prevCostRef = useRef(currentProblemCost)
useEffect(() => {
const resultsChanged = results.length !== prevResultsLengthRef.current
const costChanged = currentProblemCost !== prevCostRef.current
if (resultsChanged || costChanged) {
prevResultsLengthRef.current = results.length
prevCostRef.current = currentProblemCost
const newThresholds = calculateComplexityScaledThresholds(results, timing, currentProblemCost)
dispatch({ type: 'UPDATE_THRESHOLDS', thresholds: newThresholds })
}
}, [results, timing, currentProblemCost])
// Refs for stable callbacks that need current values
const onAutoPauseRef = useRef(onAutoPause)
onAutoPauseRef.current = onAutoPause
const problemTermsCountRef = useRef(problemTermsCount)
problemTermsCountRef.current = problemTermsCount
// Timer orchestration for idle → encouraging → offeringHelp → autoPaused
useEffect(() => {
const timedStates: AssistanceStateName[] = ['idle', 'encouraging', 'offeringHelp']
if (!timedStates.includes(machine.state)) return
if (isPaused || !attempt) return
const { thresholds, idleStartedAt } = machine.context
const elapsed = Date.now() - idleStartedAt
let targetMs: number
let timerEventFactory: () => AssistanceEvent
switch (machine.state) {
case 'idle':
targetMs = thresholds.encouragementMs
timerEventFactory = () => ({ type: 'TIMER_ENCOURAGEMENT' })
break
case 'encouraging':
targetMs = thresholds.helpOfferMs
timerEventFactory = () => ({ type: 'TIMER_HELP_OFFER' })
break
case 'offeringHelp': {
targetMs = thresholds.autoPauseMs
timerEventFactory = () => {
const { stats } = calculateAutoPauseInfo(results)
// Enrich stats with complexity info
const normStats = calculateNormalizedResponseTimeStats(results)
const enrichedStats: AutoPauseStats = {
...stats,
meanPerUnitMs: normStats.count >= 1 ? normStats.meanPerUnit : undefined,
currentProblemCost: currentProblemCost ?? undefined,
complexityCostMissing,
}
return { type: 'TIMER_AUTO_PAUSE', autoPauseStats: enrichedStats }
}
break
}
default:
return
}
const remainingMs = targetMs - elapsed
const fireTimer = () => {
const timerEvent = timerEventFactory()
dispatch(timerEvent)
if (timerEvent.type === 'TIMER_AUTO_PAUSE') {
const autoPauseInfo: PauseInfo = {
pausedAt: new Date(),
reason: 'auto-timeout',
autoPauseStats: timerEvent.autoPauseStats,
}
onAutoPauseRef.current(autoPauseInfo)
}
}
if (remainingMs <= 0) {
fireTimer()
return
}
const timeoutId = setTimeout(fireTimer, remainingMs)
return () => clearTimeout(timeoutId)
}, [
machine.state,
machine.context.idleStartedAt,
machine.context.thresholds,
isPaused,
attempt,
results,
currentProblemCost,
complexityCostMissing,
])
// Move-on grace timer
useEffect(() => {
if (machine.state !== 'idle') return
if (!machine.context.allTermsHelped) return
if (machine.context.moveOnAvailable) return
if (!machine.context.moveOnGraceStartedAt) return
const elapsed = Date.now() - machine.context.moveOnGraceStartedAt
const remaining = machine.context.moveOnGraceMs - elapsed
if (remaining <= 0) {
dispatch({ type: 'TIMER_MOVE_ON_GRACE' })
return
}
const timeoutId = setTimeout(() => {
dispatch({ type: 'TIMER_MOVE_ON_GRACE' })
}, remaining)
return () => clearTimeout(timeoutId)
}, [
machine.state,
machine.context.allTermsHelped,
machine.context.moveOnAvailable,
machine.context.moveOnGraceStartedAt,
machine.context.moveOnGraceMs,
])
// Stable event dispatchers
const onDigitTyped = useCallback(() => {
dispatch({ type: 'DIGIT_TYPED' })
}, [])
const onWrongAnswer = useCallback(() => {
dispatch({ type: 'WRONG_ANSWER' })
}, [])
const onHelpEntered = useCallback(() => {
dispatch({ type: 'HELP_ENTERED' })
}, [])
const onHelpTermCompleted = useCallback((termIndex: number) => {
dispatch({ type: 'HELP_TERM_COMPLETED', termIndex })
}, [])
const onHelpExited = useCallback(() => {
dispatch({ type: 'HELP_EXITED', problemTermsCount: problemTermsCountRef.current })
}, [])
const onResumed = useCallback(() => {
dispatch({ type: 'RESUMED' })
}, [])
const onProblemChanged = useCallback(() => {
dispatch({ type: 'PROBLEM_CHANGED' })
}, [])
const dismissWrongAnswerSuggestion = useCallback(() => {
dispatch({ type: 'DISMISS_WRONG_ANSWER_SUGGESTION' })
}, [])
// Derived values
const showWrongAnswerSuggestionValue = showWrongAnswerSuggestion(machine.state, machine.context)
return {
machineState: machine,
showWrongAnswerSuggestion: showWrongAnswerSuggestionValue,
complexityCostMissing,
onDigitTyped,
onWrongAnswer,
onHelpEntered,
onHelpTermCompleted,
onHelpExited,
onResumed,
onProblemChanged,
dismissWrongAnswerSuggestion,
}
}
|