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* Session Trend Calculations
*
* Calculates historical trends from session data for display in the session summary.
*/
import type { SessionPlan, SlotResult } from '@/db/schema/session-plans'
export interface SessionTrends {
/** Comparison to last session */
accuracyDelta: number | null // e.g., 0.05 for +5%
previousAccuracy: number | null
/** This week stats */
weekSessions: number
weekProblems: number
weekAccuracy: number
/** All-time stats */
totalSessions: number
totalProblems: number
avgAccuracy: number
/** Streak (consecutive days with practice) */
currentStreak: number
}
/**
* Calculate accuracy from a session's results
*/
function getSessionAccuracy(session: SessionPlan): number {
const results = (session.results ?? []) as SlotResult[]
if (results.length === 0) return 0
const correct = results.filter((r) => r.isCorrect).length
return correct / results.length
}
/**
* Get problem count from a session
*/
function getSessionProblemCount(session: SessionPlan): number {
const results = (session.results ?? []) as SlotResult[]
return results.length
}
/**
* Check if a session was completed on a specific date
*/
function isSessionOnDate(session: SessionPlan, date: Date): boolean {
const completedAt = session.completedAt as unknown as number
if (!completedAt) return false
const sessionDate = new Date(completedAt)
return (
sessionDate.getFullYear() === date.getFullYear() &&
sessionDate.getMonth() === date.getMonth() &&
sessionDate.getDate() === date.getDate()
)
}
/**
* Check if a session was completed within the last N days
*/
function isSessionWithinDays(session: SessionPlan, days: number): boolean {
const completedAt = session.completedAt as unknown as number
if (!completedAt) return false
const now = Date.now()
const cutoff = now - days * 24 * 60 * 60 * 1000
return completedAt >= cutoff
}
/**
* Calculate current practice streak (consecutive days)
*/
function calculateStreak(allSessions: SessionPlan[]): number {
if (allSessions.length === 0) return 0
// Sort by completion date descending
const sorted = [...allSessions]
.filter((s) => s.completedAt)
.sort((a, b) => {
const aTime = a.completedAt as unknown as number
const bTime = b.completedAt as unknown as number
return bTime - aTime
})
if (sorted.length === 0) return 0
let streak = 0
const today = new Date()
today.setHours(0, 0, 0, 0)
// Check if there's a session today or yesterday (streak must be active)
const mostRecent = new Date(sorted[0].completedAt as unknown as number)
mostRecent.setHours(0, 0, 0, 0)
const daysDiff = Math.floor((today.getTime() - mostRecent.getTime()) / (24 * 60 * 60 * 1000))
if (daysDiff > 1) return 0 // Streak broken
// Count consecutive days backwards
const checkDate = new Date(mostRecent)
const sessionDates = new Set<string>()
for (const session of sorted) {
const date = new Date(session.completedAt as unknown as number)
date.setHours(0, 0, 0, 0)
sessionDates.add(date.toISOString().split('T')[0])
}
while (true) {
const dateStr = checkDate.toISOString().split('T')[0]
if (sessionDates.has(dateStr)) {
streak++
checkDate.setDate(checkDate.getDate() - 1)
} else {
break
}
}
return streak
}
/**
* Calculate session trends from historical data
*
* @param current - The current session being viewed
* @param previous - The session before current (for delta calculation)
* @param allSessions - All completed sessions (ordered newest first)
*/
export function calculateSessionTrends(
current: SessionPlan | null,
previous: SessionPlan | null,
allSessions: SessionPlan[]
): SessionTrends | null {
if (!current) return null
const currentAccuracy = getSessionAccuracy(current)
// Accuracy delta from previous session
const previousAccuracy = previous ? getSessionAccuracy(previous) : null
const accuracyDelta = previousAccuracy !== null ? currentAccuracy - previousAccuracy : null
// This week stats (last 7 days)
const weekSessions = allSessions.filter((s) => isSessionWithinDays(s, 7))
const weekProblems = weekSessions.reduce((sum, s) => sum + getSessionProblemCount(s), 0)
const weekCorrect = weekSessions.reduce((sum, s) => {
const results = (s.results ?? []) as SlotResult[]
return sum + results.filter((r) => r.isCorrect).length
}, 0)
const weekAccuracy = weekProblems > 0 ? weekCorrect / weekProblems : 0
// All-time stats
const totalProblems = allSessions.reduce((sum, s) => sum + getSessionProblemCount(s), 0)
const totalCorrect = allSessions.reduce((sum, s) => {
const results = (s.results ?? []) as SlotResult[]
return sum + results.filter((r) => r.isCorrect).length
}, 0)
const avgAccuracy = totalProblems > 0 ? totalCorrect / totalProblems : 0
// Streak
const currentStreak = calculateStreak(allSessions)
return {
accuracyDelta,
previousAccuracy,
weekSessions: weekSessions.length,
weekProblems,
weekAccuracy,
totalSessions: allSessions.length,
totalProblems,
avgAccuracy,
currentStreak,
}
}
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