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* Session Mode - Unified session state computation
*
* This module provides a single source of truth for determining what mode
* a student's practice session should be in:
*
* - remediation: Student has weak skills that need strengthening
* - progression: Student is ready to learn a new skill
* - maintenance: All skills are strong, mixed practice
*
* The session mode drives:
* - Dashboard banners
* - StartPracticeModal CTA
* - Session planner problem generation
*/
import { computeBktFromHistory, DEFAULT_BKT_OPTIONS } from '@/lib/curriculum/bkt'
import { BKT_THRESHOLDS } from '@/lib/curriculum/config/bkt-integration'
import { WEAK_SKILL_THRESHOLDS } from '@/lib/curriculum/config'
import { ALL_PHASES, type CurriculumPhase } from '@/lib/curriculum/definitions'
import {
getPracticingSkills,
getSkillTutorialProgress,
isSkillTutorialSatisfied,
} from '@/lib/curriculum/progress-manager'
import { getRecentSessionResults } from '@/lib/curriculum/session-planner'
import {
assessAllSkillsReadiness,
readinessMapToRecord,
type SkillReadinessResult,
} from '@/lib/curriculum/skill-readiness'
import { getActiveDeferral } from '@/lib/curriculum/progression-deferrals'
import { skillHasMathSentence } from '@/constants/skillCategories'
import { SKILL_TUTORIAL_CONFIGS, getSkillDisplayName } from './skill-tutorial-config'
// ============================================================================
// Types
// ============================================================================
/**
* Information about a skill for display purposes
*/
export interface SkillInfo {
skillId: string
displayName: string
/** P(known) from BKT, 0-1 */
pKnown: number
/** Whether displayName is a concise math rule (e.g., "+4 = +5 - 1") suitable for the practice banner */
hasMathSentence: boolean
}
/**
* Information about a blocked promotion (when remediation is needed)
*/
export interface BlockedPromotion {
/** The skill the student would learn if not blocked */
nextSkill: SkillInfo
/** Human-readable reason for the block */
reason: string
/** The curriculum phase of the blocked skill */
phase: CurriculumPhase
/** Whether the tutorial is already satisfied */
tutorialReady: boolean
}
/**
* Remediation mode - student has weak skills that need work
*/
export interface RemediationMode {
type: 'remediation'
/** Skills that need strengthening (sorted by pKnown ascending) */
weakSkills: SkillInfo[]
/** Description for the session header */
focusDescription: string
/** What promotion is being blocked, if any */
blockedPromotion?: BlockedPromotion
}
/**
* Progression mode - student is ready to learn a new skill
*/
export interface ProgressionMode {
type: 'progression'
/** The skill to learn next */
nextSkill: SkillInfo
/** The curriculum phase */
phase: CurriculumPhase
/** Whether a tutorial is required before practicing */
tutorialRequired: boolean
/** Number of times the student has skipped this tutorial */
skipCount: number
/** Description for the session header */
focusDescription: string
/**
* Whether the student can skip the tutorial and still practice.
* False when this is their first skill (no other skills to practice).
* When false, the tutorial is mandatory - skipping would result in no skills.
*/
canSkipTutorial: boolean
}
/**
* Maintenance mode - all skills are strong, mixed practice
*/
export interface MaintenanceMode {
type: 'maintenance'
/** Description for the session header */
focusDescription: string
/** Number of skills being maintained */
skillCount: number
/** Present when progression is available but not all dimensions are met or deferred */
deferredProgression?: {
nextSkill: SkillInfo
readiness: Record<string, SkillReadinessResult>
phase: CurriculumPhase
}
}
/**
* The unified session mode
*/
export type SessionMode = RemediationMode | ProgressionMode | MaintenanceMode
// ============================================================================
// Session Mode Computation
// ============================================================================
/**
* Compute the session mode for a student.
*
* This is the single source of truth for what type of session should be run.
* The result drives dashboard display, modal CTA, and problem generation.
*
* Logic:
* 1. Compute BKT to identify weak and strong skills
* 2. If weak skills exist → remediation mode
* 3. Else, find next skill in curriculum:
* - If found → progression mode
* - If not found → maintenance mode
*
* @param playerId - The player to compute mode for
* @returns The session mode
*/
export async function getSessionMode(playerId: string): Promise<SessionMode> {
// 1. Get BKT results for all practiced skills
const history = await getRecentSessionResults(playerId, 100)
const bktResults = computeBktFromHistory(history, {
...DEFAULT_BKT_OPTIONS,
confidenceThreshold: BKT_THRESHOLDS.confidence,
})
// 2. Identify weak skills (confident that P(known) is low)
const { confidenceThreshold, pKnownThreshold } = WEAK_SKILL_THRESHOLDS
const weakSkills: SkillInfo[] = bktResults.skills
.filter((s) => s.confidence >= confidenceThreshold && s.pKnown < pKnownThreshold)
.sort((a, b) => a.pKnown - b.pKnown) // Weakest first
.map((s) => ({
skillId: s.skillId,
displayName: getSkillDisplayName(s.skillId),
pKnown: s.pKnown,
hasMathSentence: skillHasMathSentence(s.skillId),
}))
// 3. Find strong skills for maintenance mode counting
const strongSkillIds = new Set(
bktResults.skills.filter((s) => s.masteryClassification === 'strong').map((s) => s.skillId)
)
// 4. Get currently practicing skills
const practicing = await getPracticingSkills(playerId)
const practicingIds = new Set(practicing.map((s) => s.skillId))
// 5. Find the next skill in curriculum (if any)
let nextSkillInfo: {
skillId: string
phase: CurriculumPhase
tutorialReady: boolean
skipCount: number
} | null = null
for (const phase of ALL_PHASES) {
const skillId = phase.primarySkillId
// Skip if no tutorial config (not a learnable skill)
if (!SKILL_TUTORIAL_CONFIGS[skillId]) {
continue
}
// Strong? Skip - they know it
if (strongSkillIds.has(skillId)) {
continue
}
// Currently practicing? They're working on it
if (practicingIds.has(skillId)) {
break // Stop looking, they're actively working on something
}
// Found first non-strong, unpracticed skill!
const tutorialProgress = await getSkillTutorialProgress(playerId, skillId)
const tutorialReady = await isSkillTutorialSatisfied(playerId, skillId)
nextSkillInfo = {
skillId,
phase,
tutorialReady,
skipCount: tutorialProgress?.skipCount ?? 0,
}
break
}
// 6. Determine mode based on weak skills and next skill
if (weakSkills.length > 0) {
// REMEDIATION MODE
const weakSkillNames = weakSkills.slice(0, 3).map((s) => s.displayName)
const moreCount = weakSkills.length - 3
const skillList =
moreCount > 0
? `${weakSkillNames.join(', ')} +${moreCount} more`
: weakSkillNames.join(weakSkills.length === 2 ? ' and ' : ', ')
const focusDescription = `Strengthening: ${skillList}`
// Check if there's a promotion being blocked
let blockedPromotion: BlockedPromotion | undefined
if (nextSkillInfo) {
const nextSkillDisplay = getSkillDisplayName(nextSkillInfo.skillId)
blockedPromotion = {
nextSkill: {
skillId: nextSkillInfo.skillId,
displayName: nextSkillDisplay,
pKnown: 0, // Not yet practiced
hasMathSentence: skillHasMathSentence(nextSkillInfo.skillId),
},
reason: `Strengthen ${weakSkillNames.slice(0, 2).join(' and ')} first`,
phase: nextSkillInfo.phase,
tutorialReady: nextSkillInfo.tutorialReady,
}
}
return {
type: 'remediation',
weakSkills,
focusDescription,
blockedPromotion,
}
}
if (nextSkillInfo) {
const nextSkillDisplay = getSkillDisplayName(nextSkillInfo.skillId)
const nextSkill: SkillInfo = {
skillId: nextSkillInfo.skillId,
displayName: nextSkillDisplay,
pKnown: 0, // Not yet practiced
hasMathSentence: skillHasMathSentence(nextSkillInfo.skillId),
}
// Gate: only offer progression if ALL practicing skills are solid (all 4 dimensions met)
// First skill ever (practicingIds.size === 0): skip readiness gate — tutorial is mandatory
const readiness = assessAllSkillsReadiness(history, bktResults.skills, practicingIds)
const allSolid =
practicingIds.size === 0 ||
[...practicingIds].every((id) => readiness.get(id)?.isSolid ?? false)
if (allSolid) {
// Check for active deferral
const deferral = await getActiveDeferral(playerId, nextSkillInfo.skillId)
if (!deferral) {
// PROGRESSION MODE
// Student can skip tutorial only if they have other skills to practice.
// If this is their first skill (no practicing skills yet), skipping would
// result in NoSkillsEnabledClientError - so we must prevent skip.
const canSkipTutorial = practicingIds.size > 0
return {
type: 'progression',
nextSkill,
phase: nextSkillInfo.phase,
tutorialRequired: !nextSkillInfo.tutorialReady,
skipCount: nextSkillInfo.skipCount,
focusDescription: `Learning: ${nextSkillDisplay}`,
canSkipTutorial,
}
}
}
// MAINTENANCE MODE with deferred progression info
return {
type: 'maintenance',
focusDescription: 'Mixed practice',
skillCount: practicingIds.size,
deferredProgression: {
nextSkill,
readiness: readinessMapToRecord(readiness),
phase: nextSkillInfo.phase,
},
}
}
// MAINTENANCE MODE
return {
type: 'maintenance',
focusDescription: 'Mixed practice',
skillCount: practicingIds.size,
}
}
// ============================================================================
// Helper Functions
// ============================================================================
/**
* Check if session mode indicates remediation is needed
*/
export function isRemediationMode(mode: SessionMode): mode is RemediationMode {
return mode.type === 'remediation'
}
/**
* Check if session mode indicates progression is available
*/
export function isProgressionMode(mode: SessionMode): mode is ProgressionMode {
return mode.type === 'progression'
}
/**
* Check if session mode indicates maintenance
*/
export function isMaintenanceMode(mode: SessionMode): mode is MaintenanceMode {
return mode.type === 'maintenance'
}
/**
* Get the weak skill IDs from a session mode (for session planner)
*/
export function getWeakSkillIds(mode: SessionMode): string[] {
if (mode.type === 'remediation') {
return mode.weakSkills.map((s) => s.skillId)
}
return []
}
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