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* Skill Changes - Utility for computing skill state changes
*
* This module computes what has changed between when a session was created
* and the current skill state, helping users decide whether to resume
* an existing session or start fresh.
*/
import type { SkillBktResult } from '@/lib/curriculum/bkt'
import { BKT_THRESHOLDS } from '@/lib/curriculum/config/bkt-integration'
import { getSkillDisplayName } from '@/lib/curriculum/skill-tutorial-config'
// ============================================================================
// Types
// ============================================================================
/**
* Information about a skill for display purposes
*/
export interface SkillChangeInfo {
skillId: string
displayName: string
/** P(known) from BKT, 0-1 */
pKnown: number
}
/**
* Summary of skill changes since a session was created
*/
export interface SkillChanges {
/** Skills now classified as weak (P(known) < 0.5) that need attention */
newWeakSkills: SkillChangeInfo[]
/** Skills added to practice since session created */
newPracticingSkills: string[]
/** Skills removed from practice since session created */
removedSkills: string[]
/** Skills now classified as strong (P(known) >= 0.8) */
masteredSkills: string[]
/** Whether there are any significant changes */
hasChanges: boolean
}
// ============================================================================
// Computation
// ============================================================================
/**
* Compute skill changes between session creation and current state.
*
* @param sessionSkillIds - Skill IDs that were practicing when session was created
* @param currentPracticingSkillIds - Skill IDs currently practicing
* @param bktResults - Current BKT results for all skills
* @returns Summary of skill changes
*/
export function computeSkillChanges(
sessionSkillIds: string[],
currentPracticingSkillIds: string[],
bktResults: Map<string, SkillBktResult>
): SkillChanges {
const sessionSet = new Set(sessionSkillIds)
const currentSet = new Set(currentPracticingSkillIds)
// Skills added since session created
const newPracticingSkills = currentPracticingSkillIds.filter((id) => !sessionSet.has(id))
// Skills removed since session created
const removedSkills = sessionSkillIds.filter((id) => !currentSet.has(id))
// Find skills that are now weak (need attention)
const newWeakSkills: SkillChangeInfo[] = []
const masteredSkills: string[] = []
for (const skillId of currentPracticingSkillIds) {
const bkt = bktResults.get(skillId)
if (!bkt || bkt.confidence < BKT_THRESHOLDS.confidence) {
// Not enough data to classify
continue
}
if (bkt.pKnown < BKT_THRESHOLDS.weak) {
newWeakSkills.push({
skillId,
displayName: getSkillDisplayName(skillId),
pKnown: bkt.pKnown,
})
} else if (bkt.pKnown >= BKT_THRESHOLDS.strong) {
masteredSkills.push(skillId)
}
}
// Sort weak skills by pKnown ascending (weakest first)
newWeakSkills.sort((a, b) => a.pKnown - b.pKnown)
const hasChanges =
newWeakSkills.length > 0 ||
newPracticingSkills.length > 0 ||
removedSkills.length > 0 ||
masteredSkills.length > 0
return {
newWeakSkills,
newPracticingSkills,
removedSkills,
masteredSkills,
hasChanges,
}
}
/**
* Format skill changes for display in the banner.
*
* @param changes - Computed skill changes
* @returns Array of formatted change descriptions
*/
export function formatSkillChanges(changes: SkillChanges): string[] {
const descriptions: string[] = []
if (changes.newWeakSkills.length > 0) {
const skillNames = changes.newWeakSkills.map((s) => s.displayName).join(', ')
descriptions.push(
`💪 ${changes.newWeakSkills.length} skill${changes.newWeakSkills.length > 1 ? 's' : ''} need attention: ${skillNames}`
)
}
if (changes.newPracticingSkills.length > 0) {
const skillNames = changes.newPracticingSkills.map(getSkillDisplayName).join(', ')
descriptions.push(
`âž• ${changes.newPracticingSkills.length} skill${changes.newPracticingSkills.length > 1 ? 's' : ''} added: ${skillNames}`
)
}
if (changes.removedSkills.length > 0) {
const skillNames = changes.removedSkills.map(getSkillDisplayName).join(', ')
descriptions.push(
`âž– ${changes.removedSkills.length} skill${changes.removedSkills.length > 1 ? 's' : ''} removed: ${skillNames}`
)
}
if (changes.masteredSkills.length > 0) {
const skillNames = changes.masteredSkills.map(getSkillDisplayName).join(', ')
descriptions.push(
`✨ ${changes.masteredSkills.length} skill${changes.masteredSkills.length > 1 ? 's' : ''} now strong: ${skillNames}`
)
}
return descriptions
}
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