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import { useMemo, useRef } from 'react'
// Stable empty array reference to avoid re-renders
const EMPTY_CHILD_IDS: string[] = []
import {
useMyClassroom,
useEnrolledStudents,
useClassroomPresence,
useActiveSessionsInClassroom,
type ActiveSessionInfo,
type PresenceStudent,
} from '@/hooks/useClassroom'
import { useChildSessionsSocket, type ChildActiveSession } from '@/hooks/useChildSessionsSocket'
import { usePlayersWithSkillData } from '@/hooks/useUserPlayers'
import type { StudentWithSkillData } from '@/utils/studentGrouping'
import type { UnifiedStudent, StudentRelationship, StudentActivity } from '@/types/student'
/**
* Return type for useUnifiedStudents hook
*/
export interface UseUnifiedStudentsResult {
/** Merged list of all students from all sources */
students: UnifiedStudent[]
/** Whether the current user is a teacher (has a classroom) */
isTeacher: boolean
/** Teacher's classroom code (for display) */
classroomCode?: string
/** Classroom ID (for actions) */
classroomId?: string
/** Whether any data is still loading */
isLoading: boolean
}
/**
* Hook to fetch and merge student data from multiple sources
*
* Combines:
* - My children (from players API)
* - Enrolled students (teacher's classroom)
* - Present students (classroom presence)
* - Active sessions (practicing status)
*
* Returns a unified list with relationship and activity status for each student.
*
* @param initialPlayers - Server-prefetched player data
* @param userId - The current user's database ID (for parent session subscriptions)
*/
export function useUnifiedStudents(
initialPlayers?: StudentWithSkillData[],
userId?: string
): UseUnifiedStudentsResult {
// Get classroom data (determines if user is a teacher)
const { data: classroom, isLoading: isLoadingClassroom } = useMyClassroom()
const isTeacher = !!classroom
// Get my children (all users see this)
const { data: myChildren = [], isLoading: isLoadingChildren } = usePlayersWithSkillData({
initialData: initialPlayers,
})
// Get child IDs for parent session subscription
const childIds = useMemo(() => myChildren.map((c) => c.id), [myChildren])
// Build initial session data from batch-fetched enrichment fields
const initialChildSessions = useMemo(() => {
const hasEnrichment = myChildren.some((c) => c.activeSession !== undefined)
if (!hasEnrichment) return undefined
const map = new Map<string, ChildActiveSession>()
for (const child of myChildren) {
if (child.activeSession) {
map.set(child.id, {
planId: child.activeSession.sessionId,
status: child.activeSession.status,
completedSlots: child.activeSession.completedProblems,
totalSlots: child.activeSession.totalProblems,
startedAt: new Date().toISOString(),
})
}
}
return map
}, [myChildren])
// Get enrolled students (teachers only)
const { data: enrolledStudents = [], isLoading: isLoadingEnrolled } = useEnrolledStudents(
classroom?.id
)
// Get present students (teachers only)
const { data: presentStudents = [], isLoading: isLoadingPresence } = useClassroomPresence(
classroom?.id
)
// Get active sessions (teachers only - for students in their classroom)
const { data: activeSessions = [], isLoading: isLoadingActiveSessions } =
useActiveSessionsInClassroom(classroom?.id)
// Get active sessions for parent's children (via WebSocket for real-time updates)
// Enabled for ALL users who have children (teachers can also be parents)
const hasChildren = childIds.length > 0
const { sessionMap: childSessionMap, isLoading: isLoadingChildSessions } = useChildSessionsSocket(
hasChildren ? userId : undefined,
hasChildren ? childIds : EMPTY_CHILD_IDS,
initialChildSessions
)
// Build lookup maps for efficient merging
const presenceMap = useMemo(() => {
const map = new Map<string, PresenceStudent>()
for (const student of presentStudents) {
map.set(student.id, student)
}
return map
}, [presentStudents])
// Merge teacher's classroom sessions with parent's child sessions
const sessionMap = useMemo(() => {
const map = new Map<string, ActiveSessionInfo>()
// Teacher sessions from classroom
for (const session of activeSessions) {
map.set(session.playerId, session)
}
// Parent sessions from WebSocket (convert ChildActiveSession to ActiveSessionInfo format)
for (const [playerId, session] of childSessionMap) {
if (!map.has(playerId)) {
map.set(playerId, {
sessionId: session.planId,
playerId,
startedAt: session.startedAt,
completedProblems: session.completedSlots,
totalProblems: session.totalSlots,
currentPartIndex: 0,
currentSlotIndex: session.completedSlots,
totalParts: 1,
})
}
}
return map
}, [activeSessions, childSessionMap])
const enrolledIds = useMemo(() => {
return new Set(enrolledStudents.map((s) => s.id))
}, [enrolledStudents])
// Merge all sources into unified students
const students = useMemo(() => {
const studentMap = new Map<string, UnifiedStudent>()
// Add my children first (highest priority for data)
for (const child of myChildren) {
const relationship: StudentRelationship = {
isMyChild: true,
isEnrolled:
child.enrolledClassrooms !== undefined
? child.enrolledClassrooms.length > 0
: enrolledIds.has(child.id),
isPresent:
child.currentPresence !== undefined
? child.currentPresence !== null
: presenceMap.has(child.id),
enrollmentStatus: null, // TODO: Add pending enrollment lookup
}
const session = sessionMap.get(child.id)
const activity: StudentActivity = session
? {
status: 'practicing',
sessionProgress: {
current: session.completedProblems,
total: session.totalProblems,
},
sessionId: session.sessionId,
}
: { status: 'idle' }
studentMap.set(child.id, {
...child,
relationship,
activity,
})
}
// Add enrolled students that aren't already in the map (teacher view)
if (isTeacher) {
for (const enrolled of enrolledStudents) {
if (!studentMap.has(enrolled.id)) {
const relationship: StudentRelationship = {
isMyChild: false,
isEnrolled: true,
isPresent: presenceMap.has(enrolled.id),
enrollmentStatus: null,
}
const session = sessionMap.get(enrolled.id)
const activity: StudentActivity = session
? {
status: 'practicing',
sessionProgress: {
current: session.completedProblems,
total: session.totalProblems,
},
sessionId: session.sessionId,
}
: { status: 'idle' }
studentMap.set(enrolled.id, {
...enrolled,
relationship,
activity,
})
}
}
// Add present students that aren't enrolled or my children
// (edge case: student who somehow got presence without enrollment)
for (const present of presentStudents) {
if (!studentMap.has(present.id)) {
const relationship: StudentRelationship = {
isMyChild: false,
isEnrolled: false,
isPresent: true,
enrollmentStatus: null,
}
const session = sessionMap.get(present.id)
const activity: StudentActivity = session
? {
status: 'practicing',
sessionProgress: {
current: session.completedProblems,
total: session.totalProblems,
},
sessionId: session.sessionId,
}
: { status: 'idle' }
studentMap.set(present.id, {
...present,
relationship,
activity,
})
}
}
}
return Array.from(studentMap.values())
}, [
myChildren,
enrolledStudents,
presentStudents,
isTeacher,
enrolledIds,
presenceMap,
sessionMap,
])
const isLoading =
isLoadingClassroom ||
isLoadingChildren ||
(isTeacher && (isLoadingEnrolled || isLoadingPresence || isLoadingActiveSessions)) ||
(hasChildren && isLoadingChildSessions)
return {
students,
isTeacher,
classroomCode: classroom?.code,
classroomId: classroom?.id,
isLoading,
}
}
/**
* Filter students by view
*/
export function filterStudentsByView(
students: UnifiedStudent[],
view:
| 'all'
| 'my-children'
| 'my-children-active'
| 'enrolled'
| 'in-classroom'
| 'in-classroom-active'
| 'needs-attention'
): UnifiedStudent[] {
switch (view) {
case 'all':
return students
case 'needs-attention':
return students.filter((s) => s.intervention != null && !s.isArchived)
case 'my-children':
return students.filter((s) => s.relationship.isMyChild)
case 'my-children-active':
return students.filter((s) => s.relationship.isMyChild && s.activity?.status === 'practicing')
case 'enrolled':
return students.filter((s) => s.relationship.isEnrolled)
case 'in-classroom':
return students.filter((s) => s.relationship.isPresent)
case 'in-classroom-active':
return students.filter((s) => s.relationship.isPresent && s.activity?.status === 'practicing')
default:
return students
}
}
/**
* Compute view counts from unified students.
*
* Primary counts exclude archived students (matching the default display).
* Also returns `allTotal` so the UI can subtly indicate the full roster size.
*/
export function computeViewCounts(
students: UnifiedStudent[],
isTeacher: boolean
): Partial<
Record<
| 'all'
| 'my-children'
| 'my-children-active'
| 'enrolled'
| 'in-classroom'
| 'in-classroom-active'
| 'needs-attention',
number
>
> & { allTotal?: number } {
const active = students.filter((s) => !s.isArchived)
const counts: Partial<
Record<
| 'all'
| 'my-children'
| 'my-children-active'
| 'enrolled'
| 'in-classroom'
| 'in-classroom-active'
| 'needs-attention',
number
>
> & { allTotal?: number } = {
all: active.length,
allTotal: students.length,
'needs-attention': active.filter((s) => s.intervention != null).length,
'my-children': active.filter((s) => s.relationship.isMyChild).length,
'my-children-active': active.filter(
(s) => s.relationship.isMyChild && s.activity?.status === 'practicing'
).length,
}
if (isTeacher) {
counts.enrolled = active.filter((s) => s.relationship.isEnrolled).length
counts['in-classroom'] = active.filter((s) => s.relationship.isPresent).length
counts['in-classroom-active'] = active.filter(
(s) => s.relationship.isPresent && s.activity?.status === 'practicing'
).length
}
return counts
}
|