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2421 2422 2423 2424 2425 2426 2427 2428 2429 2430 2431 2432 2433 2434 2435 2436 2437 2438 2439 2440 2441 2442 2443 2444 2445 2446 2447 2448 2449 2450 2451 2452 2453 2454 2455 2456 2457 2458 2459 2460 2461 2462 2463 2464 2465 2466 2467 2468 2469 2470 2471 2472 2473 2474 2475 2476 2477 2478 2479 2480 2481 2482 2483 2484 2485 2486 2487 2488 2489 2490 2491 2492 2493 2494 | 'use client' import { animated, useSpring } from '@react-spring/web' import { useCallback, useEffect, useLayoutEffect, useMemo, useRef, useState } from 'react' import { flushSync } from 'react-dom' import { useMyAbacus } from '@/contexts/MyAbacusContext' import { useTheme } from '@/contexts/ThemeContext' import { getCurrentProblemInfo, MAX_RETRY_EPOCHS } from '@/db/schema/session-plan-helpers' import type { ProblemSlot, SessionHealth, SessionPart, SessionPartType, SessionPlan, SlotResult, } from '@/db/schema/session-plans' import { css } from '../../../styled-system/css' import type { AutoPauseStats, PauseInfo } from './autoPauseCalculator' import { calculateComplexityScaledThresholds, getComplexityCost } from './autoPauseCalculator' import { getProgressiveAssistanceTiming, shouldUseDebugTiming } from '@/constants/helpTiming' import { BrowseModeView, getLinearIndex } from './BrowseModeView' import { PartTransitionScreen, TRANSITION_COUNTDOWN_MS } from './PartTransitionScreen' import { extractTargetSkillName, PurposeBadge } from './PurposeBadge' import { RetryTransitionScreen } from './RetryTransitionScreen' import { SessionPausedModal } from './SessionPausedModal' // Re-export types for consumers export type { AutoPauseStats, PauseInfo } /** * Student info needed for the pause modal */ export interface StudentInfo { id: string name: string emoji: string color: string } import { useAbacusDisplay } from '@soroban/abacus-react' import { AbacusDock } from '../AbacusDock' import { DecompositionProvider, DecompositionSection } from '../decomposition' import { generateCoachHint } from './coachHintGenerator' import { useHasPhysicalKeyboard } from './hooks/useDeviceDetection' import { findMatchedPrefixIndex, useInteractionPhase } from './hooks/useInteractionPhase' // Audio disabled for practice sessions (use abacus / visualize) import { NumericKeypad } from './NumericKeypad' import { PracticeFeedback } from './PracticeFeedback' import { PracticeHelpOverlay } from './PracticeHelpOverlay' import { DebugOverlay } from './DebugOverlay' import { ProblemDebugPanel } from './ProblemDebugPanel' import { AssistanceDebugPanel } from './AssistanceDebugPanel' import { ProgressiveAssistanceUI } from './ProgressiveAssistanceUI' import { useProgressiveAssistance } from './hooks/useProgressiveAssistance' import { VerticalProblem } from './VerticalProblem' import type { ReceivedAbacusControl } from '@/hooks/useSessionBroadcast' import { useSetRemoteCameraSession } from '@/hooks/useSessionPlan' /** * Timing data for the current problem attempt */ export interface AttemptTimingData { /** When the current attempt started */ startTime: number /** Accumulated pause time in ms */ accumulatedPauseMs: number } /** * Complexity data for broadcast (simplified for transmission) */ export interface BroadcastComplexity { /** Complexity bounds from slot constraints */ bounds?: { min?: number; max?: number } /** Total complexity cost from generation trace */ totalCost?: number /** Number of steps (for per-term average) */ stepCount?: number /** Pre-formatted target skill name */ targetSkillName?: string } /** * Broadcast state for session observation * This is sent to teachers observing the session in real-time */ export interface BroadcastState { /** Current problem being worked on */ currentProblem: { terms: number[] answer: number } /** Unique slot ID for this problem (same ID used in answer validation) */ slotId: string /** Current phase of the interaction */ phase: 'problem' | 'feedback' | 'tutorial' /** Student's current answer (empty string if not yet started typing) */ studentAnswer: string /** Whether the answer is correct (null if not yet submitted) */ isCorrect: boolean | null /** When the current attempt started (timestamp) */ startedAt: number /** Purpose of this problem slot (why this problem was selected) */ purpose: 'focus' | 'reinforce' | 'review' | 'challenge' /** Complexity data for tooltip display */ complexity?: BroadcastComplexity /** Current problem number (1-indexed for display) */ currentProblemNumber: number /** Total problems in the session */ totalProblems: number /** Session structure for progress indicator */ sessionParts?: SessionPart[] /** Current part index for progress indicator */ currentPartIndex?: number /** Current slot index within the part */ currentSlotIndex?: number /** Accumulated results for progress indicator */ slotResults?: SlotResult[] } type SubmitAdvanceDestination = 'next-problem-same-lane' | 'state-handoff' type SubmitAdvanceIntent = 'slide-to-next-problem' | 'clear-to-loading' type SubmitMode = 'practice' | 'redo' type TransitionTarget = { problem: SlotResult['problem'] slotIndex: number partIndex: number } type SubmitAdvanceResolution = { destination: SubmitAdvanceDestination intent: SubmitAdvanceIntent transitionTarget: TransitionTarget | null } function getSubmitAdvanceIntent(destination: SubmitAdvanceDestination): SubmitAdvanceIntent { return destination === 'next-problem-same-lane' ? 'slide-to-next-problem' : 'clear-to-loading' } interface ActiveSessionProps { plan: SessionPlan /** Historical results from prior completed sessions for threshold calculation */ historicalResults?: SlotResult[] /** Student info for display in pause modal */ student: StudentInfo /** Called when a problem is answered */ onAnswer: (result: Omit<SlotResult, 'timestamp' | 'partNumber'>) => Promise<void> /** Called when session is ended early */ onEndEarly: (reason?: string) => void /** Called when session is paused (with info about why) - for external HUD updates */ onPause?: (pauseInfo: PauseInfo) => void /** Called when session is resumed - for external HUD updates */ onResume?: () => void /** Called when session completes */ onComplete: () => void /** Called with timing data when it changes (for external timing display) */ onTimingUpdate?: (timing: AttemptTimingData | null) => void /** Called with broadcast state when it changes (for session observation) */ onBroadcastStateChange?: (state: BroadcastState | null) => void /** Whether browse mode is active (controlled externally via toggle in PracticeSubNav) */ isBrowseMode?: boolean /** Controlled browse index (linear problem index) */ browseIndex?: number /** Called when browse index changes (for external navigation from progress indicator) */ onBrowseIndexChange?: (index: number) => void /** Teacher abacus control received from observing teacher */ teacherControl?: ReceivedAbacusControl | null /** Called after teacher control has been handled (to clear the state) */ onTeacherControlHandled?: () => void /** Teacher-initiated pause request (from observing teacher) */ teacherPauseRequest?: { message?: string } | null /** Called after teacher pause has been handled (to clear the state) */ onTeacherPauseHandled?: () => void /** Teacher-initiated resume request (from observing teacher) */ teacherResumeRequest?: boolean /** Called after teacher resume has been handled (to clear the state) */ onTeacherResumeHandled?: () => void /** Manual pause request from parent (HUD pause button) */ manualPauseRequest?: boolean /** Called after manual pause has been handled (to clear the state) */ onManualPauseHandled?: () => void /** Called when a part transition starts (for broadcasting to observers) */ onPartTransition?: ( previousPartType: SessionPartType | null, nextPartType: SessionPartType, countdownStartTime: number, countdownDurationMs: number ) => void /** Called when a part transition completes (for broadcasting to observers) */ onPartTransitionComplete?: () => void /** Redo state - when set, show a redo problem instead of current session problem */ redoState?: { isActive: boolean linearIndex: number originalPartIndex: number originalSlotIndex: number originalResult: SlotResult } | null /** Called to record a redo result (separate from onAnswer since it doesn't advance position) */ onRecordRedo?: (params: { playerId: string planId: string result: Omit<SlotResult, 'timestamp' | 'partNumber'> redoContext: { originalPartIndex: number originalSlotIndex: number originalWasCorrect: boolean } }) => Promise<SessionPlan> /** Called when the redo is complete or cancelled */ onRedoComplete?: () => void /** Called to cancel the redo without recording */ onCancelRedo?: () => void /** Called when a result is edited in browse mode (to trigger refetch) */ onResultEdited?: () => void /** When true, show the debug overlay with submit buttons */ debug?: boolean } /** * Calculate the number of abacus columns needed to compute a problem. * * This considers all intermediate running totals as we progress through the terms, * not just the final answer. For subtraction (e.g., 87 - 45 = 42), we need * enough columns for the minuend (87), not just the answer (42). */ function calculateAbacusColumns(terms: number[]): number { if (terms.length === 0) return 1 let runningTotal = 0 let maxAbsValue = 0 for (const term of terms) { runningTotal += term maxAbsValue = Math.max(maxAbsValue, Math.abs(runningTotal)) } return Math.max(1, String(maxAbsValue).length) } /** * Linear problem display component for Part 3 */ function LinearProblem({ terms, userAnswer, isFocused, isCompleted, correctAnswer, isDark, detectedPrefixIndex, }: { terms: number[] userAnswer: string isFocused: boolean isCompleted: boolean correctAnswer: number isDark: boolean /** Detected prefix index - shows "..." instead of "=" for partial sums */ detectedPrefixIndex?: number }) { // Build the equation string const equation = terms .map((term, i) => { if (i === 0) return String(term) return term < 0 ? ` - ${Math.abs(term)}` : ` + ${term}` }) .join('') // Use "..." for prefix sums (mathematically incomplete), "=" for final answer const isPrefixSum = detectedPrefixIndex !== undefined const operator = isPrefixSum ? '…' : '=' // Use numeric comparison so "09" equals 9 const numericUserAnswer = parseInt(userAnswer, 10) const answeredCorrectly = isCompleted && numericUserAnswer === correctAnswer return ( <div data-component="linear-problem" data-prefix-mode={isPrefixSum ? 'true' : undefined} className={css({ display: 'flex', alignItems: 'center', justifyContent: 'center', gap: '1rem', fontFamily: 'monospace', fontSize: '2rem', fontWeight: 'bold', })} > <span className={css({ color: isDark ? 'gray.200' : 'gray.800' })}> {equation}{' '} <span className={css({ color: isPrefixSum ? isDark ? 'yellow.400' : 'yellow.600' : isDark ? 'gray.200' : 'gray.800', })} > {operator} </span> </span> <span className={css({ minWidth: '80px', padding: '0.5rem 1rem', borderRadius: '8px', textAlign: 'center', backgroundColor: isCompleted ? answeredCorrectly ? isDark ? 'green.900' : 'green.100' : isDark ? 'red.900' : 'red.100' : isDark ? 'gray.800' : 'gray.100', color: isCompleted ? answeredCorrectly ? isDark ? 'green.200' : 'green.700' : isDark ? 'red.200' : 'red.700' : isDark ? 'gray.200' : 'gray.800', border: '2px solid', borderColor: isFocused ? 'blue.400' : isDark ? 'gray.600' : 'gray.300', })} > {userAnswer || (isFocused ? '?' : '')} </span> </div> ) } /** * ActiveSession - The main practice session component * * Features: * - Three-part session structure (abacus, visualization, linear) * - Part-specific display and instructions * - Adaptive input (keyboard on desktop, on-screen keypad on mobile) * - Session health indicators * - On-screen abacus toggle (for abacus part only) * - Teacher controls (pause, end early) * * State Architecture: * - Uses useInteractionPhase hook for interaction state machine * - Single source of truth for all UI state * - Explicit phase transitions instead of boolean flags */ export function ActiveSession({ plan, historicalResults, student, onAnswer, onEndEarly, onPause, onResume, onComplete, onTimingUpdate, onBroadcastStateChange, isBrowseMode: isBrowseModeProp = false, browseIndex: browseIndexProp, onBrowseIndexChange, teacherControl, onTeacherControlHandled, teacherPauseRequest, onTeacherPauseHandled, teacherResumeRequest, onTeacherResumeHandled, manualPauseRequest, onManualPauseHandled, onPartTransition, onPartTransitionComplete, redoState, onRecordRedo, onRedoComplete, onCancelRedo, onResultEdited, debug = false, }: ActiveSessionProps) { const { resolvedTheme } = useTheme() const isDark = resolvedTheme === 'dark' // Check if abacus is docked (to force show submit button) const { isDockedByUser, requestDock, undock, dock, setDockedValue, visionConfig, captureTrainingColumns, setVisionRemoteSession, } = useMyAbacus() // Mutation for saving remote camera session ID to the session plan const setRemoteCameraSessionMutation = useSetRemoteCameraSession() // Track whether we've synced from DB to avoid infinite loops const hasInitializedRemoteSessionRef = useRef(false) const lastSyncedRemoteSessionRef = useRef<string | null>(null) // Sync remote camera session ID between session plan (DB) and vision config (context) useEffect(() => { // On mount: sync from DB to context if plan has a remote camera session if (!hasInitializedRemoteSessionRef.current) { hasInitializedRemoteSessionRef.current = true if (plan.remoteCameraSessionId) { setVisionRemoteSession(plan.remoteCameraSessionId) lastSyncedRemoteSessionRef.current = plan.remoteCameraSessionId } return } // After initialization: sync from context to DB when it changes const currentRemoteSession = visionConfig.remoteCameraSessionId if (currentRemoteSession !== lastSyncedRemoteSessionRef.current) { lastSyncedRemoteSessionRef.current = currentRemoteSession setRemoteCameraSessionMutation.mutate({ playerId: student.id, planId: plan.id, remoteCameraSessionId: currentRemoteSession, }) } }, [ plan.id, plan.remoteCameraSessionId, student.id, visionConfig.remoteCameraSessionId, setVisionRemoteSession, setRemoteCameraSessionMutation, ]) // Get abacus display config (for physical abacus column count in vision mode) const { config: abacusDisplayConfig } = useAbacusDisplay() // Track which problems have had training data collected (one frame per problem) const trainingDataCollectedRef = useRef<Set<string>>(new Set()) // Collect training data when vision is enabled and answer is correct const collectVisionTrainingData = useCallback( async (correctAnswer: number, slotIndex: number) => { // Only collect if vision is enabled and docked if (!visionConfig.enabled || !isDockedByUser) return // Create a unique key for this problem to avoid duplicate collection const problemKey = `${plan.id}-${slotIndex}` if (trainingDataCollectedRef.current.has(problemKey)) return // Get column count from display config (physicalAbacusColumns for vision detection) const columnCount = abacusDisplayConfig?.physicalAbacusColumns ?? 5 // Capture the current column images const columns = captureTrainingColumns(columnCount) if (!columns || columns.length === 0) { return } // Mark as collected before sending (to avoid race conditions) trainingDataCollectedRef.current.add(problemKey) // Send to the collection API (fire and forget - don't block the UI) try { const response = await fetch('/api/vision-training/collect', { method: 'POST', headers: { 'Content-Type': 'application/json' }, body: JSON.stringify({ columns, correctAnswer, playerId: student.id, sessionId: plan.id, }), }) if (!response.ok) { return } } catch { return } }, [ visionConfig.enabled, isDockedByUser, plan.id, student.id, captureTrainingColumns, abacusDisplayConfig, ] ) // Compute initial problem from plan for SSR hydration (must be before useInteractionPhase) // Uses getCurrentProblemInfo to account for retry epochs const currentProblemInfo = useMemo(() => getCurrentProblemInfo(plan), [plan]) const initialProblem = useMemo(() => { if (currentProblemInfo) { return { problem: currentProblemInfo.problem, slotIndex: currentProblemInfo.originalSlotIndex, partIndex: plan.currentPartIndex, } } return undefined }, [currentProblemInfo, plan.currentPartIndex]) // ============================================================================ // SINGLE SOURCE OF TRUTH: Which problem should be displayed right now // ============================================================================ // This computed value derives the active problem from redoState + plan. // The hook reacts to changes in activeProblem.key to load new problems, eliminating // the need for synchronization effects between redoState and phase.attempt.problem. const activeProblem = useMemo(() => { // Redo mode takes priority - user clicked on a problem to redo if (redoState?.isActive) { const redoPart = plan.parts[redoState.originalPartIndex] const redoProblem = (redoPart?.slots[redoState.originalSlotIndex] as ProblemSlot)?.problem if (redoProblem) { return { problem: redoProblem, slotIndex: redoState.originalSlotIndex, partIndex: redoState.originalPartIndex, key: `redo-${redoState.linearIndex}`, } } } // Normal mode: use currentProblemInfo (handles epochs/retries correctly) if (currentProblemInfo?.problem) { return { problem: currentProblemInfo.problem, slotIndex: currentProblemInfo.originalSlotIndex, partIndex: plan.currentPartIndex, key: `normal-${plan.currentPartIndex}-${currentProblemInfo.originalSlotIndex}-${currentProblemInfo.epochNumber ?? 0}`, } } return null }, [redoState, plan.parts, plan.currentPartIndex, currentProblemInfo]) const latestActiveProblemRef = useRef(activeProblem) const latestCurrentProblemInfoRef = useRef(currentProblemInfo) useEffect(() => { latestActiveProblemRef.current = activeProblem latestCurrentProblemInfoRef.current = currentProblemInfo }, [activeProblem, currentProblemInfo]) // Interaction state machine - single source of truth for UI state const { phase, attempt, helpContext, outgoingAttempt, canAcceptInput, showAsCompleted, showHelpOverlay, showInputArea, showFeedback, inputIsFocused, isTransitioning, isPaused, isSubmitting, prefixSums, prefixMatch, matchedPrefixIndex, canSubmit, shouldAutoSubmit, ambiguousHelpTermIndex, handleDigit, handleBackspace, enterHelpMode, exitHelpMode, clearAnswer, setAnswer, startSubmit, completeSubmit, startTransition, completeTransition, clearToLoading, pause, resume, } = useInteractionPhase({ initialProblem, activeProblem, }) // Progressive assistance state machine — subsumes auto-pause timer const handleAutoPause = useCallback( (info: PauseInfo) => { setPauseInfo(info) pause() onPause?.(info) }, [pause, onPause] ) // Combine historical results from prior sessions with current session results. // Historical data provides the baseline for threshold calculation from session start; // current session results refine it as the student answers more problems. const thresholdResults = useMemo( () => [...(historicalResults ?? []), ...plan.results], [historicalResults, plan.results] ) const assistance = useProgressiveAssistance({ attempt: attempt ? { startTime: attempt.startTime, accumulatedPauseMs: attempt.accumulatedPauseMs, problem: { terms: attempt.problem.terms, generationTrace: attempt.problem.generationTrace, }, } : null, results: thresholdResults, problemTermsCount: attempt?.problem?.terms?.length ?? 0, isPaused, onAutoPause: handleAutoPause, }) // Debug: log complexity costs and thresholds for all problems // Skips the initial render before historical data loads to avoid a misleading defaults-only table. useEffect(() => { if (!historicalResults) return // still loading — skip if (typeof window === 'undefined') return try { if (localStorage.getItem('helpDebugTiming') !== 'true') return } catch { return } const timing = getProgressiveAssistanceTiming(shouldUseDebugTiming()) const rows = plan.parts.flatMap((part, pi) => part.slots.map((slot, si) => { const cost = getComplexityCost(slot.problem ?? null) const t = calculateComplexityScaledThresholds(thresholdResults, timing, cost) return { part: pi + 1, slot: si + 1, terms: slot.problem?.terms?.join(', ') ?? '?', cost: cost ?? '(none)', encourage: `${(t.encouragementMs / 1000).toFixed(1)}s`, helpOffer: `${(t.helpOfferMs / 1000).toFixed(1)}s`, autoPause: `${(t.autoPauseMs / 1000).toFixed(1)}s`, } }) ) void rows // thresholds computed for autopause timing // eslint-disable-next-line react-hooks/exhaustive-deps }, [historicalResults]) // Sync assistance machine with interaction phase transitions const prevPhaseRef = useRef(phase.phase) useEffect(() => { const prev = prevPhaseRef.current const curr = phase.phase prevPhaseRef.current = curr // Entered help mode if (curr === 'helpMode' && prev !== 'helpMode') { assistance.onHelpEntered() } // Exited help mode if (prev === 'helpMode' && curr !== 'helpMode') { assistance.onHelpExited() } }, [phase.phase, assistance.onHelpEntered, assistance.onHelpExited]) // Notify assistance machine when problem changes const prevActiveProblemKeyRef = useRef(activeProblem?.key) useEffect(() => { const prevKey = prevActiveProblemKeyRef.current const currKey = activeProblem?.key prevActiveProblemKeyRef.current = currKey if (prevKey !== undefined && currKey !== prevKey) { assistance.onProblemChanged() } }, [activeProblem?.key, assistance.onProblemChanged]) // Notify parent of timing data changes for external timing display useEffect(() => { if (onTimingUpdate) { if (attempt) { onTimingUpdate({ startTime: attempt.startTime, accumulatedPauseMs: attempt.accumulatedPauseMs, }) } else { onTimingUpdate(null) } } }, [onTimingUpdate, attempt?.startTime, attempt?.accumulatedPauseMs]) // Audio disabled for practice sessions (use abacus / visualize) // Calculate total progress across all parts (needed for broadcast state) const totalProblems = useMemo(() => { return plan.parts.reduce((sum, part) => sum + part.slots.length, 0) }, [plan.parts]) const completedProblems = useMemo(() => { let count = 0 for (let i = 0; i < plan.currentPartIndex; i++) { count += plan.parts[i].slots.length } count += plan.currentSlotIndex return count }, [plan.parts, plan.currentPartIndex, plan.currentSlotIndex]) // Notify parent of broadcast state changes for session observation useEffect(() => { if (!onBroadcastStateChange) return // Helper to extract complexity data from a slot const extractComplexity = (slot: ProblemSlot | undefined): BroadcastComplexity | undefined => { if (!slot) return undefined const bounds = slot.complexityBounds const trace = slot.problem?.generationTrace const hasBounds = bounds && (bounds.min !== undefined || bounds.max !== undefined) const hasCost = trace?.totalComplexityCost !== undefined if (!hasBounds && !hasCost) return undefined return { bounds: hasBounds ? { min: bounds?.min, max: bounds?.max } : undefined, totalCost: trace?.totalComplexityCost, stepCount: trace?.steps?.length, targetSkillName: extractTargetSkillName(slot) ?? undefined, } } // Get current slot's purpose from plan const currentPart = plan.parts[plan.currentPartIndex] const slot = currentPart?.slots[plan.currentSlotIndex] const purpose = slot?.purpose ?? 'focus' // During transitioning, we show the outgoing (completed) problem, not the incoming one // But we use the PREVIOUS slot's purpose since we're still showing feedback for it if (phase.phase === 'transitioning' && outgoingAttempt) { // During transition, use the previous slot's purpose and complexity const prevSlotIndex = plan.currentSlotIndex > 0 ? plan.currentSlotIndex - 1 : 0 const prevSlot = currentPart?.slots[prevSlotIndex] const prevPurpose = prevSlot?.purpose ?? purpose onBroadcastStateChange({ currentProblem: { terms: outgoingAttempt.problem.terms, answer: outgoingAttempt.problem.answer, }, slotId: prevSlot?.slotId ?? slot?.slotId ?? '', phase: 'feedback', studentAnswer: outgoingAttempt.userAnswer, isCorrect: outgoingAttempt.result === 'correct', startedAt: attempt?.startTime ?? Date.now(), purpose: prevPurpose, complexity: extractComplexity(prevSlot), currentProblemNumber: completedProblems + 1, totalProblems, // Session structure for progress indicator sessionParts: plan.parts, // Use redo indices when in redo mode so observer sees correct active problem currentPartIndex: redoState?.isActive ? redoState.originalPartIndex : plan.currentPartIndex, currentSlotIndex: redoState?.isActive ? redoState.originalSlotIndex : plan.currentSlotIndex, slotResults: plan.results, }) return } if (!attempt) { onBroadcastStateChange(null) return } // Map internal phase to broadcast phase let broadcastPhase: 'problem' | 'feedback' | 'tutorial' if (phase.phase === 'helpMode') { broadcastPhase = 'tutorial' } else if (phase.phase === 'showingFeedback') { broadcastPhase = 'feedback' } else { broadcastPhase = 'problem' } // Determine if answer is correct (only known in feedback phase) let isCorrect: boolean | null = null if (phase.phase === 'showingFeedback') { // Use the result stored in the phase, not calculated from attempt isCorrect = phase.result === 'correct' } onBroadcastStateChange({ currentProblem: { terms: attempt.problem.terms, answer: attempt.problem.answer, }, slotId: currentProblemInfo?.slotId ?? slot?.slotId ?? '', phase: broadcastPhase, studentAnswer: attempt.userAnswer, isCorrect, startedAt: attempt.startTime, purpose, complexity: extractComplexity(slot), currentProblemNumber: completedProblems + 1, totalProblems, // Session structure for progress indicator sessionParts: plan.parts, // Use redo indices when in redo mode so observer sees correct active problem currentPartIndex: redoState?.isActive ? redoState.originalPartIndex : plan.currentPartIndex, currentSlotIndex: redoState?.isActive ? redoState.originalSlotIndex : plan.currentSlotIndex, slotResults: plan.results, }) }, [ onBroadcastStateChange, attempt?.problem?.terms, attempt?.problem?.answer, attempt?.userAnswer, attempt?.startTime, phase, outgoingAttempt, plan.parts, plan.currentPartIndex, plan.currentSlotIndex, plan.results, completedProblems, totalProblems, redoState?.isActive, redoState?.originalPartIndex, redoState?.originalSlotIndex, currentProblemInfo?.slotId, ]) // Handle teacher abacus control events useEffect(() => { if (!teacherControl) return // Only handle controls during problem-solving phases const isInputPhase = phase.phase === 'inputting' || phase.phase === 'awaitingDisambiguation' || phase.phase === 'helpMode' if (!isInputPhase || !attempt) { onTeacherControlHandled?.() return } switch (teacherControl.type) { case 'set-value': // Teacher sets the abacus to a specific value // Update both the docked abacus value AND the answer input setDockedValue(teacherControl.value) setAnswer(String(teacherControl.value)) break case 'show-abacus': // Request dock with animation (triggers MyAbacus to animate into dock) if (!isDockedByUser && dock) { requestDock() } break case 'hide-abacus': // Undock the MyAbacus if (isDockedByUser) { undock() } break } // Clear the control after handling onTeacherControlHandled?.() }, [ teacherControl, phase.phase, attempt, setAnswer, setDockedValue, isDockedByUser, dock, requestDock, undock, onTeacherControlHandled, ]) // Handle teacher-initiated pause requests // Use a ref to track if we've handled this request to prevent duplicate handling const handledPauseRef = useRef(false) useEffect(() => { if (!teacherPauseRequest) { handledPauseRef.current = false return } if (handledPauseRef.current) return handledPauseRef.current = true // Pause the session with teacher reason const newPauseInfo: PauseInfo = { pausedAt: new Date(), reason: 'teacher', teacherMessage: teacherPauseRequest.message, } setPauseInfo(newPauseInfo) pause() onPause?.(newPauseInfo) // Clear the request after handling onTeacherPauseHandled?.() }, [teacherPauseRequest, pause, onPause, onTeacherPauseHandled]) // Handle teacher-initiated resume requests // Use a ref to track if we've handled this request to prevent duplicate handling const handledResumeRef = useRef(false) useEffect(() => { if (!teacherResumeRequest) { handledResumeRef.current = false return } if (handledResumeRef.current) return handledResumeRef.current = true // Resume the session setPauseInfo(undefined) assistance.onResumed() resume() onResume?.() // Clear the request after handling onTeacherResumeHandled?.() }, [teacherResumeRequest, resume, onResume, onTeacherResumeHandled]) // Handle manual pause requests from parent (HUD pause button) const handledManualPauseRef = useRef(false) useEffect(() => { if (!manualPauseRequest) { handledManualPauseRef.current = false return } if (handledManualPauseRef.current) return handledManualPauseRef.current = true // Pause the session with manual reason const newPauseInfo: PauseInfo = { pausedAt: new Date(), reason: 'manual', } setPauseInfo(newPauseInfo) pause() onPause?.(newPauseInfo) // Clear the request after handling onManualPauseHandled?.() }, [manualPauseRequest, pause, onPause, onManualPauseHandled]) // Track which help elements have been individually dismissed // These reset when entering a new help session (helpContext changes) const [helpAbacusDismissed, setHelpAbacusDismissed] = useState(false) const [helpPanelDismissed, setHelpPanelDismissed] = useState(false) // Track when answer is fading out (for dream sequence) const [answerFadingOut, setAnswerFadingOut] = useState(false) // Capture reveal policy at submit-time so feedback is stable even if plan advances. const [showCorrectAnswerOnIncorrect, setShowCorrectAnswerOnIncorrect] = useState(true) // Track pause info for displaying in the modal (single source of truth) const [pauseInfo, setPauseInfo] = useState<PauseInfo | undefined>(undefined) // Part transition state - for showing transition screen between parts const [isInPartTransition, setIsInPartTransition] = useState(false) const [transitionData, setTransitionData] = useState<{ previousPartType: SessionPartType | null nextPartType: SessionPartType countdownStartTime: number } | null>(null) // Track the previous part index to detect part changes const prevPartIndexRef = useRef<number>(plan.currentPartIndex) // Retry transition state - for showing transition screen between retry epochs const [isInRetryTransition, setIsInRetryTransition] = useState(false) const [retryTransitionData, setRetryTransitionData] = useState<{ epochNumber: number problemCount: number } | null>(null) // Track previous epoch to detect epoch changes const prevEpochRef = useRef<number>(0) // Browse mode state - isBrowseMode is controlled via props // browseIndex can be controlled (browseIndexProp + onBrowseIndexChange) or internal const [internalBrowseIndex, setInternalBrowseIndex] = useState(0) // Determine if browse index is controlled const isControlledBrowseIndex = browseIndexProp !== undefined const browseIndex = isControlledBrowseIndex ? browseIndexProp : internalBrowseIndex // Unified setter that handles both controlled and uncontrolled modes const setBrowseIndex = useCallback( (index: number | ((prev: number) => number)) => { const newIndex = typeof index === 'function' ? index(browseIndex) : index if (isControlledBrowseIndex) { onBrowseIndexChange?.(newIndex) } else { setInternalBrowseIndex(newIndex) } }, [browseIndex, isControlledBrowseIndex, onBrowseIndexChange] ) // Compute current practice position as a linear index const currentPracticeLinearIndex = useMemo(() => { return getLinearIndex(plan.parts, plan.currentPartIndex, plan.currentSlotIndex) }, [plan.parts, plan.currentPartIndex, plan.currentSlotIndex]) // When entering browse mode, initialize browseIndex to current problem const prevBrowseModeProp = useRef(isBrowseModeProp) useEffect(() => { if (isBrowseModeProp && !prevBrowseModeProp.current) { // Just entered browse mode - set to current practice position setBrowseIndex(currentPracticeLinearIndex) } prevBrowseModeProp.current = isBrowseModeProp }, [isBrowseModeProp, currentPracticeLinearIndex, setBrowseIndex]) const handleDigitWithTimerReset = useCallback( (digit: string) => { assistance.onDigitTyped() handleDigit(digit) }, [handleDigit, assistance.onDigitTyped] ) // Reset dismissed states when help context changes (new help session) useEffect(() => { if (helpContext) { setHelpAbacusDismissed(false) setHelpPanelDismissed(false) setAnswerFadingOut(false) } }, [helpContext]) // Exit help mode when both help elements are dismissed useEffect(() => { if (showHelpOverlay && helpAbacusDismissed && helpPanelDismissed) { exitHelpMode() } }, [showHelpOverlay, helpAbacusDismissed, helpPanelDismissed, exitHelpMode]) // Refs for measuring problem widths during animation const outgoingRef = useRef<HTMLDivElement>(null) const activeRef = useRef<HTMLDivElement>(null) // Track if we need to apply centering offset (set true when transition starts) const needsCenteringOffsetRef = useRef(false) // Store the centering offset value for the animation end const centeringOffsetRef = useRef(0) // Spring for problem transition animation const [trackSpring, trackApi] = useSpring(() => ({ x: 0, outgoingOpacity: 1, activeOpacity: 1, config: { tension: 200, friction: 26 }, })) // Spring for submit button entrance animation // Show submit button when: manual submit is required OR abacus is docked (user needs way to submit) const showSubmitButton = attempt?.manualSubmitRequired || isDockedByUser const submitButtonSpring = useSpring({ transform: showSubmitButton ? 'translateY(0px)' : 'translateY(60px)', opacity: showSubmitButton ? 1 : 0, scale: showSubmitButton ? 1 : 0.8, config: { tension: 280, friction: 14 }, }) // Apply centering offset before paint to prevent jank useLayoutEffect(() => { if (needsCenteringOffsetRef.current && outgoingRef.current) { const outgoingWidth = outgoingRef.current.offsetWidth const gap = 32 // 2rem gap const centeringOffset = (outgoingWidth + gap) / 2 centeringOffsetRef.current = centeringOffset // Set initial position to compensate for flexbox centering trackApi.set({ x: centeringOffset, outgoingOpacity: 1, activeOpacity: 0, }) needsCenteringOffsetRef.current = false // Start fade-in of new problem trackApi.start({ activeOpacity: 1, config: { tension: 200, friction: 26 }, }) // Start slide after a brief moment (150ms) setTimeout(() => { trackApi.start({ x: -centeringOffset, outgoingOpacity: 0, config: { tension: 170, friction: 22 }, onRest: () => { // Outgoing is now invisible - complete the transition flushSync(() => { completeTransition() }) trackApi.set({ x: 0, outgoingOpacity: 1, activeOpacity: 1 }) }, }) }, 150) } }, [outgoingAttempt, trackApi, completeTransition]) const hasPhysicalKeyboard = useHasPhysicalKeyboard() // Track if keypad was ever shown - once shown, keep it visible // This prevents the keypad from disappearing if user uses physical keyboard const keypadWasShownRef = useRef(false) if (hasPhysicalKeyboard === false) { keypadWasShownRef.current = true } const showOnScreenKeypad = hasPhysicalKeyboard === false || keypadWasShownRef.current // Get current part and slot from plan (accounting for retry epochs) const parts = plan.parts const currentPartIndex = plan.currentPartIndex const currentSlotIndex = plan.currentSlotIndex const gameBreakTraceEnabled = typeof window !== 'undefined' && new URLSearchParams(window.location.search).get('debugGameBreakTrace') === '1' const logGameBreakTrace = useCallback( (event: string, details: Record<string, unknown> = {}) => { if (!gameBreakTraceEnabled) return console.log('[GBTRACE][client]', event, { ts: new Date().toISOString(), planId: plan.id, currentPartIndex, currentSlotIndex, ...details, }) }, [gameBreakTraceEnabled, plan.id, currentPartIndex, currentSlotIndex] ) const currentPart = parts[currentPartIndex] as SessionPart | undefined // Use getCurrentProblemInfo which handles both original slots and retry epochs const regularSlot = currentProblemInfo ? { slotId: currentProblemInfo.slotId, index: currentProblemInfo.originalSlotIndex, purpose: currentProblemInfo.purpose, problem: currentProblemInfo.problem, constraints: {}, } : (currentPart?.slots[currentSlotIndex] as ProblemSlot | undefined) const sessionHealth = plan.sessionHealth as SessionHealth | null // Redo mode: get the redo problem slot if in redo mode const isInRedoMode = redoState?.isActive ?? false const redoSlot = useMemo(() => { if (!redoState?.isActive) return null const redoPart = parts[redoState.originalPartIndex] if (!redoPart) return null return redoPart.slots[redoState.originalSlotIndex] as ProblemSlot | undefined }, [redoState, parts]) // Use redo slot when in redo mode, otherwise regular slot const currentSlot = isInRedoMode && redoSlot ? redoSlot : regularSlot // Whether the original redo problem was correct (for display and recording logic) const redoOriginalWasCorrect = redoState?.originalResult?.isCorrect ?? false // NOTE: Redo mode problem switching is now handled by the useInteractionPhase hook // via the activeProblem prop. The hook reacts to activeProblem.key changes and // loads the new problem automatically, eliminating synchronization bugs. // Retry epoch tracking const inRetryEpoch = currentProblemInfo?.isRetry ?? false const retryEpochNumber = currentProblemInfo?.epochNumber ?? 0 // Check for session completion useEffect(() => { if (currentPartIndex >= parts.length) { onComplete() } }, [currentPartIndex, parts.length, onComplete]) // Detect part index changes and trigger transition screen useEffect(() => { const prevIndex = prevPartIndexRef.current logGameBreakTrace('active-session-part-transition-effect', { prevIndex, currentPartIndex, partsLength: parts.length, willTriggerTransition: currentPartIndex !== prevIndex && currentPartIndex < parts.length, }) // If part index changed and we have a valid next part if (currentPartIndex !== prevIndex && currentPartIndex < parts.length) { const prevPart = prevIndex < parts.length ? parts[prevIndex] : null const nextPart = parts[currentPartIndex] logGameBreakTrace('active-session-trigger-transition-screen', { previousPartType: prevPart?.type ?? null, nextPartType: nextPart.type, }) // Trigger transition screen const startTime = Date.now() setTransitionData({ previousPartType: prevPart?.type ?? null, nextPartType: nextPart.type, countdownStartTime: startTime, }) setIsInPartTransition(true) // Broadcast transition to observers onPartTransition?.(prevPart?.type ?? null, nextPart.type, startTime, TRANSITION_COUNTDOWN_MS) } // Update ref for next comparison prevPartIndexRef.current = currentPartIndex }, [currentPartIndex, parts, onPartTransition, logGameBreakTrace]) // Handle transition screen completion (countdown finished or user skipped) const handleTransitionComplete = useCallback(() => { logGameBreakTrace('active-session-transition-complete-callback') setIsInPartTransition(false) setTransitionData(null) // Broadcast transition complete to observers onPartTransitionComplete?.() }, [onPartTransitionComplete, logGameBreakTrace]) // Detect retry epoch transitions and show retry transition screen useEffect(() => { const currentEpoch = retryEpochNumber const prevEpoch = prevEpochRef.current // If we just entered a new retry epoch (epoch increased from 0 to 1, or 1 to 2) if (currentEpoch > prevEpoch && currentEpoch > 0 && currentProblemInfo) { // Get the count of problems in this retry epoch const retryState = plan.retryState?.[plan.currentPartIndex] const problemCount = retryState?.currentEpochItems?.length ?? 0 if (problemCount > 0) { setRetryTransitionData({ epochNumber: currentEpoch, problemCount, }) setIsInRetryTransition(true) } } prevEpochRef.current = currentEpoch }, [retryEpochNumber, currentProblemInfo, plan.retryState, plan.currentPartIndex]) // Handle retry transition screen completion const handleRetryTransitionComplete = useCallback(() => { setIsInRetryTransition(false) setRetryTransitionData(null) }, []) // NOTE: Problem initialization is now handled by the useInteractionPhase hook // via the activeProblem prop. Initial load uses initialProblem for SSR hydration, // and subsequent changes (including redo mode and retry epochs) are detected via // activeProblem.key changes. // Auto-trigger help when an unambiguous prefix sum is detected // The awaitingDisambiguation phase handles the timer and auto-transitions to helpMode when it expires // This effect only handles the inputting phase case for unambiguous matches // DISABLED when abacus is docked - user controls when to submit, help triggers on submit if needed useEffect(() => { // Skip auto-help when abacus is docked - user has manual control if (isDockedByUser) return // Only handle unambiguous prefix matches in inputting phase // Ambiguous cases are handled by awaitingDisambiguation phase, which auto-transitions to helpMode if (phase.phase !== 'inputting') return // Skip ambiguous matches - they should go through awaitingDisambiguation flow if (prefixMatch.isAmbiguous) return // For unambiguous matches, trigger immediately if (matchedPrefixIndex >= 0 && matchedPrefixIndex < prefixSums.length - 1) { const newConfirmedCount = matchedPrefixIndex + 1 if (newConfirmedCount < phase.attempt.problem.terms.length) { enterHelpMode(newConfirmedCount) } } }, [phase, prefixMatch, matchedPrefixIndex, prefixSums.length, enterHelpMode, isDockedByUser]) // Handle when student reaches target value on help abacus // Sequence: show target value → dismiss abacus → show value in answer boxes → fade to empty → exit const handleTargetReached = useCallback(() => { if (phase.phase !== 'helpMode' || !helpContext) return // Notify assistance machine that a help term was completed assistance.onHelpTermCompleted(helpContext.termIndex) // Step 1: Set the answer to the target value (shows in answer boxes behind abacus) setAnswer(String(helpContext.targetValue)) // Step 2: After a brief moment, dismiss the help abacus to reveal the answer setTimeout(() => { setHelpAbacusDismissed(true) // Step 3: After abacus fades out (300ms), answer boxes are visible with target value // Wait 1 second to let user see the result setTimeout(() => { // Step 4: Start fading out the answer setAnswerFadingOut(true) // Step 5: After fade-out completes (300ms), clear and exit setTimeout(() => { clearAnswer() setAnswerFadingOut(false) exitHelpMode() }, 300) // Match fade-out duration }, 1000) // Show target value in answer boxes for 1 second }, 600) // Brief pause to see success state on abacus }, [ phase.phase, helpContext, setAnswer, clearAnswer, exitHelpMode, assistance.onHelpTermCompleted, ]) // Handle value change from the docked abacus const handleAbacusDockValueChange = useCallback( (newValue: number) => { // When the abacus shows the correct answer, set it and auto-submit will trigger setAnswer(String(newValue)) }, [setAnswer] ) const resolvePracticeTransitionTarget = useCallback( ({ submittedPartIndex, submittedSlotIndex, submittedEpochNumber, activeProblemKeyAtSubmit, }: { submittedPartIndex: number submittedSlotIndex: number submittedEpochNumber: number activeProblemKeyAtSubmit: string | null }): TransitionTarget | null => { // Original lane progression can be derived synchronously from part slots. if (submittedEpochNumber === 0) { const submittedPart = plan.parts[submittedPartIndex] const nextSlot = submittedPart?.slots[submittedSlotIndex + 1] if (submittedPart && nextSlot?.problem) { return { problem: nextSlot.problem, slotIndex: submittedSlotIndex + 1, partIndex: submittedPartIndex, } } } // Retry and async mutation paths rely on the latest active problem snapshot. const latestActiveProblem = latestActiveProblemRef.current const latestCurrentProblemInfo = latestCurrentProblemInfoRef.current const hasAdvancedProblem = latestActiveProblem && activeProblemKeyAtSubmit && latestActiveProblem.key !== activeProblemKeyAtSubmit const isSamePartAsSubmitted = latestActiveProblem?.partIndex === submittedPartIndex const latestEpochNumber = latestCurrentProblemInfo?.epochNumber ?? submittedEpochNumber const isSameEpochAsSubmitted = latestEpochNumber === submittedEpochNumber if (hasAdvancedProblem && isSamePartAsSubmitted && isSameEpochAsSubmitted) { return { problem: latestActiveProblem.problem, slotIndex: latestActiveProblem.slotIndex, partIndex: latestActiveProblem.partIndex, } } return null }, [plan.parts] ) const enactSubmitAdvance = useCallback( ({ intent, transitionTarget }: SubmitAdvanceResolution) => { if (intent === 'slide-to-next-problem' && transitionTarget) { needsCenteringOffsetRef.current = true startTransition( transitionTarget.problem, transitionTarget.slotIndex, transitionTarget.partIndex ) return } clearToLoading() }, [startTransition, clearToLoading] ) const resolveSubmitAdvanceWithWait = useCallback( ({ mode, submittedPartIndex, submittedSlotIndex, submittedEpochNumber, activeProblemKeyAtSubmit, redoReturnTarget, }: { mode: SubmitMode submittedPartIndex: number submittedSlotIndex: number submittedEpochNumber: number activeProblemKeyAtSubmit: string | null redoReturnTarget: TransitionTarget | null }): Promise<SubmitAdvanceResolution> => new Promise((resolve) => { if (mode === 'redo') { const destination: SubmitAdvanceDestination = redoReturnTarget ? 'next-problem-same-lane' : 'state-handoff' resolve({ destination, intent: getSubmitAdvanceIntent(destination), transitionTarget: redoReturnTarget, }) return } const maxWaitMs = 500 const pollIntervalMs = 50 const startedAt = Date.now() const settle = () => { const transitionTarget = resolvePracticeTransitionTarget({ submittedPartIndex, submittedSlotIndex, submittedEpochNumber, activeProblemKeyAtSubmit, }) const destination: SubmitAdvanceDestination = transitionTarget ? 'next-problem-same-lane' : 'state-handoff' resolve({ destination, intent: getSubmitAdvanceIntent(destination), transitionTarget, }) } const tick = () => { const transitionTarget = resolvePracticeTransitionTarget({ submittedPartIndex, submittedSlotIndex, submittedEpochNumber, activeProblemKeyAtSubmit, }) if (transitionTarget) { resolve({ destination: 'next-problem-same-lane', intent: 'slide-to-next-problem', transitionTarget, }) return } if (Date.now() - startedAt >= maxWaitMs) { settle() return } setTimeout(tick, pollIntervalMs) } tick() }), [resolvePracticeTransitionTarget] ) // Handle submit const handleSubmit = useCallback(async () => { // Allow submitting from inputting, awaitingDisambiguation, or helpMode if ( phase.phase !== 'inputting' && phase.phase !== 'awaitingDisambiguation' && phase.phase !== 'helpMode' ) { return } if (!phase.attempt.userAnswer) return const attemptData = phase.attempt const answerNum = parseInt(attemptData.userAnswer, 10) if (Number.isNaN(answerNum)) return // When abacus is docked and not already in help mode, check if answer is a prefix sum // If so, trigger help mode instead of submitting (mimic auto-help behavior on submit) // NOTE: We use findMatchedPrefixIndex which correctly handles the case where an // intermediate prefix sum equals the final answer (e.g., 65-34-15+33-18=31 where // prefixSums = [65, 31, 16, 49, 31] - indexOf(31) would return 1, not 4) if (isDockedByUser && phase.phase !== 'helpMode') { const prefixMatch = findMatchedPrefixIndex(attemptData.userAnswer, prefixSums) // helpTermIndex >= 0 means this is an intermediate prefix sum, not the final answer if (prefixMatch.matchedIndex >= 0 && prefixMatch.helpTermIndex >= 0) { enterHelpMode(prefixMatch.helpTermIndex) return } } // Transition to submitting phase startSubmit() // Subtract accumulated pause time to get actual response time const responseTimeMs = Date.now() - attemptData.startTime - attemptData.accumulatedPauseMs const isCorrect = answerNum === attemptData.problem.answer const epochNumberAtSubmit = currentProblemInfo?.epochNumber ?? 0 const activeProblemKeyAtSubmit = activeProblem?.key ?? null const redoReturnTarget = currentProblemInfo ? { problem: currentProblemInfo.problem, slotIndex: currentProblemInfo.originalSlotIndex, partIndex: plan.currentPartIndex, } : null const hasRetriesRemaining = epochNumberAtSubmit < MAX_RETRY_EPOCHS // Only reveal the correct answer when retries are exhausted (epoch 2 wrong). // Never reveal during manual redo — the kid chose to retry voluntarily and // shouldn't get a free look at the answer. setShowCorrectAnswerOnIncorrect(isCorrect || !hasRetriesRemaining) // Notify assistance machine of incorrect answer if (!isCorrect) { assistance.onWrongAnswer() } // Collect vision training data if answer is correct and vision is enabled // This runs in the background (fire-and-forget) to not block the UI if (isCorrect) { collectVisionTrainingData(attemptData.problem.answer, attemptData.slotIndex) } // Record the result const result: Omit<SlotResult, 'timestamp' | 'partNumber'> = { slotId: currentProblemInfo!.slotId, slotIndex: attemptData.slotIndex, problem: attemptData.problem, studentAnswer: answerNum, isCorrect, responseTimeMs, skillsExercised: attemptData.problem.skillsRequired, usedOnScreenAbacus: phase.phase === 'helpMode', incorrectAttempts: assistance.machineState.context.wrongAttemptCount, hadHelp: phase.phase === 'helpMode' || assistance.machineState.context.helpedTermIndices.size > 0, } const submitMode: SubmitMode = isInRedoMode && redoState ? 'redo' : 'practice' // Handle redo recording separately - return path is still unified through submit advance resolver. if (submitMode === 'redo' && redoState) { // Only record if the original problem was incorrect // (Original correct = pure practice, no recording to avoid unintentional penalty) if (!redoOriginalWasCorrect && onRecordRedo) { // Add retry tracking fields const redoSlotId = plan.parts[redoState.originalPartIndex]?.slots[redoState.originalSlotIndex]?.slotId const redoResult: Omit<SlotResult, 'timestamp' | 'partNumber'> = { ...result, // Override slotId + slotIndex with the original slot from the redo slotId: redoSlotId, slotIndex: redoState.originalSlotIndex, isRetry: true, epochNumber: (redoState.originalResult.epochNumber ?? 0) + 1, originalSlotIndex: redoState.originalSlotIndex, } // Use the special redo mutation that doesn't advance session position await onRecordRedo({ playerId: student.id, planId: plan.id, result: redoResult, redoContext: { originalPartIndex: redoState.originalPartIndex, originalSlotIndex: redoState.originalSlotIndex, originalWasCorrect: redoOriginalWasCorrect, }, }) } // Continue into unified completion path below. } else { // Optimistic submit: for epoch 0 mid-part, advance immediately without // waiting for the server. The mutation queue in PracticeClient serializes // the actual server writes. const nextSlotExists = !!plan.parts[attemptData.partIndex]?.slots[attemptData.slotIndex + 1]?.problem const canAdvanceOptimistically = epochNumberAtSubmit === 0 && nextSlotExists if (canAdvanceOptimistically) { void onAnswer(result) } else { await onAnswer(result) } } // Complete submit with result completeSubmit(isCorrect ? 'correct' : 'incorrect') // Wait for feedback display then resolve-and-enact the shared advance policy. setTimeout( () => { void resolveSubmitAdvanceWithWait({ mode: submitMode, submittedPartIndex: attemptData.partIndex, submittedSlotIndex: attemptData.slotIndex, submittedEpochNumber: epochNumberAtSubmit, activeProblemKeyAtSubmit, redoReturnTarget, }).then((resolution) => { enactSubmitAdvance(resolution) if (submitMode === 'redo') { onRedoComplete?.() } }) }, isCorrect ? 500 : 1500 ) }, [ phase, onAnswer, onRecordRedo, student.id, plan.id, plan.currentPartIndex, activeProblem?.key, startSubmit, completeSubmit, enactSubmitAdvance, resolveSubmitAdvanceWithWait, currentProblemInfo?.epochNumber, isDockedByUser, prefixSums, enterHelpMode, collectVisionTrainingData, isInRedoMode, redoState, redoOriginalWasCorrect, onRedoComplete, assistance.onWrongAnswer, assistance.machineState.context.wrongAttemptCount, assistance.machineState.context.helpedTermIndices, ]) // Auto-submit when correct answer is entered useEffect(() => { if (shouldAutoSubmit) { handleSubmit() } }, [shouldAutoSubmit, handleSubmit]) // Debug submit: set answer then submit after React commits the state update const debugSubmitInFlightRef = useRef(false) const handleSubmitRef = useRef(handleSubmit) handleSubmitRef.current = handleSubmit const debugSubmit = useCallback( (value: number) => { if (debugSubmitInFlightRef.current) return debugSubmitInFlightRef.current = true flushSync(() => { setAnswer(String(value)) }) // Use rAF to ensure React has committed the state before calling handleSubmit requestAnimationFrame(() => { handleSubmitRef.current() // Reset guard after submission completes (allow next submit after delay) setTimeout(() => { debugSubmitInFlightRef.current = false }, 2000) }) }, [setAnswer] ) // Handle keyboard input useEffect(() => { if (!hasPhysicalKeyboard || !canAcceptInput) return const handleKeyDown = (e: KeyboardEvent) => { // Escape or Delete/Backspace exits help mode when in help mode if (e.key === 'Escape') { e.preventDefault() if (showHelpOverlay) { exitHelpMode() } return } if (e.key === 'Backspace' || e.key === 'Delete') { e.preventDefault() if (showHelpOverlay) { exitHelpMode() } else { handleBackspace() } return } if (e.key === 'Enter') { e.preventDefault() handleSubmit() } else if (/^[0-9]$/.test(e.key)) { handleDigitWithTimerReset(e.key) } } document.addEventListener('keydown', handleKeyDown) return () => document.removeEventListener('keydown', handleKeyDown) }, [ hasPhysicalKeyboard, canAcceptInput, handleSubmit, handleDigitWithTimerReset, handleBackspace, showHelpOverlay, exitHelpMode, ]) // Auto-pause is now handled by the progressive assistance state machine // (useProgressiveAssistance hook, TIMER_AUTO_PAUSE event) const handlePause = useCallback( (info?: PauseInfo) => { const newPauseInfo: PauseInfo = info ?? { pausedAt: new Date(), reason: 'manual', } setPauseInfo(newPauseInfo) pause() onPause?.(newPauseInfo) }, [pause, onPause] ) const handleResume = useCallback(() => { setPauseInfo(undefined) assistance.onResumed() resume() onResume?.() }, [resume, onResume, assistance.onResumed]) // Handle skip (from progressive assistance) — show correct answer and advance const handleSkip = useCallback(async () => { if (!attempt) return // In redo mode, cancel the redo instead if (isInRedoMode && onCancelRedo) { onCancelRedo() return } // Record as incorrect with help const responseTimeMs = Date.now() - attempt.startTime - attempt.accumulatedPauseMs const result: Omit<SlotResult, 'timestamp' | 'partNumber'> = { slotId: currentProblemInfo!.slotId, slotIndex: attempt.slotIndex, problem: attempt.problem, studentAnswer: attempt.problem.answer, // Record the correct answer isCorrect: false, // Marked incorrect because student didn't solve it responseTimeMs, skillsExercised: attempt.problem.skillsRequired, usedOnScreenAbacus: false, incorrectAttempts: assistance.machineState.context.wrongAttemptCount, hadHelp: true, helpTrigger: 'manual' as const, } // Show the correct answer briefly setShowCorrectAnswerOnIncorrect(true) setAnswer(String(attempt.problem.answer)) startSubmit() // Fire-and-forget: mutation enters the queue, 1500ms feedback delay // + clearToLoading provides enough time for the cache to update void onAnswer(result) completeSubmit('incorrect') // Advance after showing the answer setTimeout(() => { clearToLoading() }, 1500) }, [ attempt, isInRedoMode, onCancelRedo, onAnswer, currentProblemInfo, setAnswer, startSubmit, completeSubmit, clearToLoading, assistance.machineState.context.wrongAttemptCount, ]) // Handle help requested from progressive assistance UI const handleHelpFromAssistance = useCallback(() => { enterHelpMode(0) }, [enterHelpMode]) const getHealthColor = (health: SessionHealth['overall']) => { switch (health) { case 'good': return 'green.500' case 'warning': return 'yellow.500' case 'struggling': return 'red.500' default: return 'gray.500' } } const getHealthEmoji = (health: SessionHealth['overall']) => { switch (health) { case 'good': return '🟢' case 'warning': return '🟡' case 'struggling': return '🔴' default: return '⚪' } } if (!currentPart || !attempt) { return ( <div data-component="active-session" data-status="loading" className={css({ display: 'flex', alignItems: 'center', justifyContent: 'center', minHeight: '300px', })} > <div className={css({ fontSize: '1.25rem', color: isDark ? 'gray.400' : 'gray.500', })} > Loading next problem... </div> </div> ) } // Browse mode - show the browse view instead of the practice view if (isBrowseModeProp) { return ( <BrowseModeView plan={plan} browseIndex={browseIndex} currentPracticeIndex={currentPracticeLinearIndex} studentId={student.id} onResultEdited={onResultEdited} /> ) } // Check if we should show the abacus dock const showAbacusDock = currentPart.type === 'abacus' && !showHelpOverlay return ( <div data-component="active-session" data-status={isPaused ? 'paused' : 'active'} data-phase={phase.phase} data-part-type={currentPart.type} className={css({ display: 'flex', flexDirection: 'column', gap: { base: '0.75rem', md: '1rem' }, padding: { base: '0.5rem', md: '1rem' }, // Widen container when dock is shown to accommodate side-by-side layout maxWidth: showAbacusDock ? '780px' : '600px', margin: '0 auto', height: '100%', overflow: 'hidden', transition: 'max-width 0.3s ease', })} > {/* Problem + Dock row container */} <div data-section="problem-dock-row" className={css({ display: 'flex', flexDirection: 'row', gap: '1.5rem', flex: 1, minHeight: 0, alignItems: 'stretch', })} > {/* Problem display */} <div data-section="problem-area" className={css({ display: 'flex', flexDirection: 'column', alignItems: 'center', justifyContent: 'center', gap: { base: '0.75rem', md: '1rem' }, flex: showAbacusDock ? '1 1 60%' : '1 1 100%', minHeight: 0, minWidth: 0, paddingTop: { base: '1rem', md: '2rem' }, paddingRight: { base: '1rem', md: '2rem' }, paddingBottom: { base: '1rem', md: '1.5rem' }, paddingLeft: { base: '1rem', md: '2rem' }, backgroundColor: isDark ? 'gray.800' : 'white', borderRadius: '16px', boxShadow: 'md', overflow: 'hidden', })} > {/* Redo mode banner */} {isInRedoMode && redoState && ( <div data-element="redo-mode-banner" className={css({ display: 'flex', alignItems: 'center', justifyContent: 'center', gap: '0.75rem', padding: '0.5rem 1rem', backgroundColor: isDark ? 'orange.900/80' : 'orange.100', borderRadius: '12px', border: '2px solid', borderColor: isDark ? 'orange.600' : 'orange.400', marginBottom: '0.5rem', })} > <span className={css({ fontSize: '1.25rem' })}>🔄</span> <span className={css({ fontWeight: '600', fontSize: '0.875rem', color: isDark ? 'orange.100' : 'orange.800', })} > Redoing Problem #{redoState.linearIndex + 1} {redoOriginalWasCorrect && ( <span className={css({ marginLeft: '0.5rem', fontWeight: '400', fontSize: '0.75rem', color: isDark ? 'orange.300' : 'orange.600', })} > (Practice Only) </span> )} </span> <button type="button" onClick={onCancelRedo} className={css({ padding: '0.25rem 0.5rem', fontSize: '0.75rem', fontWeight: '500', color: isDark ? 'gray.300' : 'gray.600', backgroundColor: isDark ? 'gray.700' : 'gray.200', borderRadius: '6px', border: 'none', cursor: 'pointer', transition: 'all 0.15s ease', _hover: { backgroundColor: isDark ? 'gray.600' : 'gray.300', }, })} > ← Back to #{completedProblems + 1} </button> </div> )} {/* Purpose badge with tooltip - shows retry indicator when in retry epoch */} {currentSlot && !isInRedoMode && ( <div data-element="purpose-retry-container" className={css({ display: 'flex', alignItems: 'center', gap: '0.5rem', })} > {/* Retry indicator badge */} {inRetryEpoch && ( <div data-element="retry-indicator" data-epoch={retryEpochNumber} className={css({ padding: '0.25rem 0.75rem', borderRadius: '20px', fontSize: '0.75rem', fontWeight: 'bold', textTransform: 'uppercase', backgroundColor: isDark ? 'red.900' : 'red.100', color: isDark ? 'red.200' : 'red.700', border: '1px solid', borderColor: isDark ? 'red.700' : 'red.300', })} > Retry {retryEpochNumber}/2 </div> )} <PurposeBadge purpose={currentSlot.purpose} slot={currentSlot} /> </div> )} {/* Problem display - centered, with help panel positioned outside */} <div data-element="problem-with-help" className={css({ display: 'flex', justifyContent: 'center', width: '100%', })} > {/* Animated track for problem transitions */} <animated.div data-element="problem-track" style={{ display: 'flex', alignItems: 'flex-start', transform: trackSpring.x.to((x) => `translateX(${x}px)`), }} > {/* Outgoing problem (slides left during transition) */} {outgoingAttempt && ( <animated.div ref={outgoingRef} data-element="outgoing-problem" style={{ opacity: trackSpring.outgoingOpacity, marginRight: '2rem', position: 'relative' as const, }} > <VerticalProblem terms={outgoingAttempt.problem.terms} userAnswer={outgoingAttempt.userAnswer} isCompleted={true} correctAnswer={outgoingAttempt.problem.answer} size="large" generationTrace={outgoingAttempt.problem.generationTrace} /> {/* Feedback stays with outgoing problem */} <PracticeFeedback isCorrect={true} correctAnswer={outgoingAttempt.problem.answer} className={css({ position: 'absolute', top: '100%', left: '50%', transform: 'translateX(-50%)', marginTop: '0.5rem', whiteSpace: 'nowrap', })} /> </animated.div> )} {/* Current problem */} <animated.div ref={activeRef} data-element="problem-container" style={{ opacity: trackSpring.activeOpacity, position: 'relative' as const, }} > {currentPart.format === 'vertical' ? ( <VerticalProblem terms={attempt.problem.terms} userAnswer={attempt.userAnswer} isFocused={inputIsFocused} isCompleted={showAsCompleted} correctAnswer={attempt.problem.answer} showCorrectAnswerOnIncorrect={showCorrectAnswerOnIncorrect} size="large" currentHelpTermIndex={helpContext?.termIndex} needHelpTermIndex={ // Only show "need help?" prompt when not already in help mode !showHelpOverlay && ambiguousHelpTermIndex >= 0 ? ambiguousHelpTermIndex : undefined } rejectedDigit={attempt.rejectedDigit} detectedPrefixIndex={ // Show vision feedback for prefix sums (not final answer) matchedPrefixIndex >= 0 && matchedPrefixIndex < prefixSums.length - 1 ? matchedPrefixIndex : undefined } helpOverlay={ // Always render overlay when in help mode (for exit transition) showHelpOverlay && helpContext ? ( <PracticeHelpOverlay currentValue={helpContext.currentValue} targetValue={helpContext.targetValue} columns={Math.max( 1, Math.max(helpContext.currentValue, helpContext.targetValue).toString() .length )} onTargetReached={handleTargetReached} onDismiss={() => { setHelpAbacusDismissed(true) clearAnswer() }} visible={!helpAbacusDismissed} /> ) : undefined } helpOverlayVisible={showHelpOverlay && !helpAbacusDismissed} helpOverlayTransitionMs={helpAbacusDismissed ? 300 : 1000} onHelpOverlayTransitionEnd={clearAnswer} answerFadingOut={answerFadingOut} generationTrace={attempt.problem.generationTrace} complexityBudget={currentSlot?.constraints?.maxComplexityBudgetPerTerm} /> ) : ( <LinearProblem terms={attempt.problem.terms} userAnswer={attempt.userAnswer} isFocused={inputIsFocused} isCompleted={showAsCompleted} correctAnswer={attempt.problem.answer} isDark={isDark} detectedPrefixIndex={ matchedPrefixIndex >= 0 && matchedPrefixIndex < prefixSums.length - 1 ? matchedPrefixIndex : undefined } /> )} {/* Help panel - absolutely positioned to the right of the problem */} {showHelpOverlay && helpContext && !helpPanelDismissed && ( <div data-element="help-panel" className={css({ position: 'absolute', left: '100%', top: 0, marginLeft: '1.5rem', display: 'flex', flexDirection: 'column', gap: '0.75rem', padding: '1rem', backgroundColor: isDark ? 'blue.900' : 'blue.50', borderRadius: '12px', border: '2px solid', borderColor: isDark ? 'blue.700' : 'blue.200', minWidth: '200px', maxWidth: '280px', })} > {/* Close button for help panel */} <button type="button" data-action="close-help-panel" onClick={() => setHelpPanelDismissed(true)} className={css({ position: 'absolute', top: '-8px', right: '-8px', width: '24px', height: '24px', display: 'flex', alignItems: 'center', justifyContent: 'center', fontSize: '0.875rem', fontWeight: 'bold', color: isDark ? 'gray.400' : 'gray.500', backgroundColor: isDark ? 'gray.700' : 'gray.200', border: '2px solid', borderColor: isDark ? 'gray.600' : 'gray.300', borderRadius: '50%', cursor: 'pointer', zIndex: 10, _hover: { backgroundColor: isDark ? 'gray.600' : 'gray.300', color: isDark ? 'gray.200' : 'gray.700', }, })} aria-label="Close help panel" > × </button> {/* Coach hint */} {(() => { const hint = generateCoachHint( helpContext.currentValue, helpContext.targetValue ) if (!hint) return null return ( <div data-element="coach-hint" className={css({ padding: '0.5rem 0.75rem', backgroundColor: isDark ? 'gray.800' : 'white', borderRadius: '8px', border: '1px solid', borderColor: isDark ? 'blue.800' : 'blue.100', })} > <p className={css({ fontSize: '0.875rem', color: isDark ? 'gray.300' : 'gray.700', lineHeight: '1.4', margin: 0, })} > {hint} </p> </div> ) })()} {/* Decomposition display */} <DecompositionProvider startValue={helpContext.currentValue} targetValue={helpContext.targetValue} currentStepIndex={0} abacusColumns={Math.max( 1, Math.max(helpContext.currentValue, helpContext.targetValue).toString() .length )} > <DecompositionSection className={css({ padding: '0.5rem 0.75rem', backgroundColor: isDark ? 'gray.800' : 'white', borderRadius: '8px', border: '1px solid', borderColor: isDark ? 'blue.800' : 'blue.100', whiteSpace: 'nowrap', })} labelClassName={css({ fontSize: '0.625rem', fontWeight: 'bold', color: isDark ? 'blue.300' : 'blue.600', marginBottom: '0.25rem', textTransform: 'uppercase', })} contentClassName={css({ fontFamily: 'monospace', fontSize: '0.875rem', color: isDark ? 'gray.100' : 'gray.800', })} /> </DecompositionProvider> </div> )} </animated.div> </animated.div> </div> {/* Feedback message - only show for incorrect */} {showFeedback && ( <PracticeFeedback isCorrect={false} correctAnswer={attempt.problem.answer} showCorrectAnswer={showCorrectAnswerOnIncorrect} /> )} </div> {/* Abacus dock - flex sibling of problem-area for proper layout */} {showAbacusDock && ( <AbacusDock id="practice-abacus" columns={calculateAbacusColumns(attempt.problem.terms)} interactive={true} showNumbers={false} animated={true} onValueChange={handleAbacusDockValueChange} className={css({ flex: '0 0 auto', // Responsive sizing - constrain both width and height // Mobile: smaller (140px-180px), Desktop: larger (up to 240px) width: { base: 'clamp(140px, 20vw, 180px)', md: 'clamp(180px, 18vw, 240px)', }, // Mobile: shorter, Desktop: taller height: { base: 'clamp(180px, 28vh, 240px)', md: 'clamp(220px, 26vh, 300px)', }, alignSelf: 'center', // Remove background/shadow - the docked content has its own styling })} /> )} </div> {/* Progressive assistance UI (encouragement, help button, skip) */} {showInputArea && !isPaused && ( <ProgressiveAssistanceUI machineState={assistance.machineState} showWrongAnswerSuggestion={assistance.showWrongAnswerSuggestion} isDark={isDark} onHelpRequested={handleHelpFromAssistance} onSkip={handleSkip} onDismissWrongAnswerSuggestion={assistance.dismissWrongAnswerSuggestion} /> )} {/* Input area */} {showInputArea && !isPaused && ( <div data-section="input-area" className={css({ flexShrink: 0, // Don't shrink the input area })} > {/* Submit button - hidden on small screens when keypad is shown (integrated into keypad instead) */} {!showOnScreenKeypad && ( <div className={css({ display: 'flex', justifyContent: 'center', marginBottom: '0.75rem', minHeight: '48px', overflow: 'hidden', })} > <animated.button type="button" data-action="submit" data-visible={showSubmitButton} onClick={handleSubmit} disabled={!canSubmit || isSubmitting || !showSubmitButton} style={submitButtonSpring} className={css({ padding: '0.75rem 2rem', fontSize: '1.125rem', fontWeight: 'bold', borderRadius: '8px', border: 'none', cursor: !canSubmit || !showSubmitButton ? 'not-allowed' : 'pointer', backgroundColor: canSubmit ? 'blue.500' : isDark ? 'gray.700' : 'gray.300', color: !canSubmit ? (isDark ? 'gray.400' : 'gray.500') : 'white', _hover: { backgroundColor: canSubmit && showSubmitButton ? 'blue.600' : isDark ? 'gray.600' : 'gray.300', }, })} > Submit </animated.button> </div> )} {/* On-screen keypad for mobile - includes submit button */} {showOnScreenKeypad && ( <NumericKeypad onDigit={handleDigitWithTimerReset} onBackspace={handleBackspace} onSubmit={handleSubmit} disabled={isSubmitting} currentValue={attempt.userAnswer} showSubmitButton={showSubmitButton} /> )} </div> )} {/* Debug overlay - submit buttons for automated testing */} {debug && attempt?.problem && ( <DebugOverlay correctAnswer={attempt.problem.answer} partIndex={currentPartIndex} slotIndex={currentSlotIndex} partType={currentPart?.type ?? 'abacus'} purpose={currentSlot?.purpose ?? 'focus'} onSubmitCorrect={() => debugSubmit(attempt.problem.answer)} onSubmitWrong={() => debugSubmit(attempt.problem.answer + 1)} /> )} {/* Debug panel - shows current problem details when visual debug mode is on */} {currentSlot?.problem && ( <ProblemDebugPanel problem={currentSlot.problem} slot={currentSlot} part={currentPart} partIndex={currentPartIndex} slotIndex={currentSlotIndex} userInput={attempt.userAnswer} phaseName={phase.phase} /> )} {/* Assistance debug panel - shows state machine state when visual debug mode is on */} <AssistanceDebugPanel machineState={assistance.machineState} /> {/* Warning when complexity cost data is missing — visible in dev, console.warn in prod */} {assistance.complexityCostMissing && (process.env.NODE_ENV === 'production' ? ( (() => { console.warn( '[autopause] complexityCostMissing: current problem has no generationTrace.totalComplexityCost — using flat 5-min timeout' ) return null })() ) : ( <div data-element="complexity-cost-warning" className={css({ position: 'fixed', bottom: '4px', left: '4px', padding: '4px 8px', backgroundColor: 'rgba(255, 165, 0, 0.9)', color: 'black', fontSize: '11px', borderRadius: '4px', zIndex: 9999, pointerEvents: 'none', })} > Missing complexityCost — flat 5min timeout </div> ))} {/* Session Paused Modal - rendered here as single source of truth */} <SessionPausedModal isOpen={isPaused} student={student} session={plan} pauseInfo={pauseInfo} onResume={handleResume} onEndSession={() => onEndEarly('Session ended by user')} /> {/* Part Transition Screen - full screen overlay between parts */} {transitionData && ( <PartTransitionScreen isVisible={isInPartTransition} previousPartType={transitionData.previousPartType} nextPartType={transitionData.nextPartType} countdownStartTime={transitionData.countdownStartTime} student={student} onComplete={handleTransitionComplete} /> )} {/* Retry Transition Screen - shown when entering a retry epoch */} {retryTransitionData && ( <RetryTransitionScreen isVisible={isInRetryTransition} epochNumber={retryTransitionData.epochNumber} problemCount={retryTransitionData.problemCount} student={{ name: student.name, emoji: student.emoji }} onComplete={handleRetryTransitionComplete} /> )} </div> ) } export default ActiveSession |