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2x 2x 2x 2x 227x 1x 161x 161x 161x 161x 812x 812x 731x 812x 579x 579x 579x 161x 161x 1x 18x 18x 18x 18x 1x 10x 10x 10x | import type { CompositionPlan } from '@/lib/elevenlabs/music-client'
import type { SongPromptInput } from './extract-session-stats'
export const SESSION_SONG_PLAN_VALIDATION_FLAG = 'session-song.plan-validation'
export const MAX_SONG_DURATION_MS = 60_000
export type SongPlanValidationMode = 'off' | 'observe' | 'repair' | 'enforce'
export type SongPlanValidationOutcome =
| 'skipped'
| 'passed'
| 'flagged'
| 'repaired'
| 'fallback'
| 'blocked'
export type SongPlanEvidenceType =
| 'player'
| 'problem'
| 'skill'
| 'game'
| 'duration'
| 'invented_fact'
export interface SongPlanValidationPolicy {
mode: SongPlanValidationMode
maxRepairAttempts: number
fallbackOnFailedRepair: boolean
logPassingPlans: boolean
}
export interface SongPlanValidationIssue {
code: string
message: string
evidenceType?: SongPlanEvidenceType
}
export interface SongPlanValidationResult {
ok: boolean
issues: SongPlanValidationIssue[]
totalDurationMs: number
}
export interface SongPlanValidationMetadata {
mode: SongPlanValidationMode
outcome: SongPlanValidationOutcome
issues: SongPlanValidationIssue[]
rawTotalDurationMs: number
finalTotalDurationMs: number
repaired: boolean
fallbackUsed: boolean
repairAttempts: number
}
export interface SongPlanCandidate extends CompositionPlan {
title: string
}
export class SongCompositionValidationError extends Error {
constructor(
message: string,
public metadata: SongPlanValidationMetadata,
public candidate?: SongPlanCandidate
) {
super(message)
this.name = 'SongCompositionValidationError'
}
}
const DEFAULT_ENABLED_POLICY: SongPlanValidationPolicy = {
mode: 'observe',
maxRepairAttempts: 1,
fallbackOnFailedRepair: true,
logPassingPlans: false,
}
const OFF_POLICY: SongPlanValidationPolicy = {
mode: 'off',
maxRepairAttempts: 0,
fallbackOnFailedRepair: false,
logPassingPlans: false,
}
const GAME_BREAK_SECTION_RE =
/\b(interlude|rap\s*break|bridge|breakdown|the\s+drop|drop|cadence|side\s*quest|halftime|half-time|spoken)\b/i
const COMMON_CHILD_NAMES = [
'alex',
'amelia',
'ava',
'ben',
'charlie',
'ella',
'emma',
'ethan',
'harper',
'henry',
'isabella',
'jack',
'jamie',
'leo',
'liam',
'lily',
'lucas',
'lucy',
'mason',
'max',
'maya',
'mia',
'noah',
'olivia',
'sam',
'sophia',
'zoe',
]
const KNOWN_GAME_NAMES = [
'complement race',
'know your world',
'matching pairs',
'math discovery',
'memory lightning',
'music note match',
'rithmomachia',
'type racer',
'type racer jr',
]
export function resolveSongPlanValidationPolicy(
flag: {
enabled: boolean
config: unknown
} | null
): SongPlanValidationPolicy {
if (!flag?.enabled) return OFF_POLICY
const config =
typeof flag.config === 'string' ? parseConfigString(flag.config) : asRecord(flag.config)
if (!config) return DEFAULT_ENABLED_POLICY
const mode = isValidationMode(config.mode) ? config.mode : DEFAULT_ENABLED_POLICY.mode
const maxRepairAttempts =
typeof config.maxRepairAttempts === 'number' && Number.isFinite(config.maxRepairAttempts)
? Math.max(0, Math.min(3, Math.floor(config.maxRepairAttempts)))
: DEFAULT_ENABLED_POLICY.maxRepairAttempts
return {
mode,
maxRepairAttempts: mode === 'off' || mode === 'observe' ? 0 : maxRepairAttempts,
fallbackOnFailedRepair:
typeof config.fallbackOnFailedRepair === 'boolean'
? config.fallbackOnFailedRepair
: DEFAULT_ENABLED_POLICY.fallbackOnFailedRepair,
logPassingPlans:
typeof config.logPassingPlans === 'boolean'
? config.logPassingPlans
: DEFAULT_ENABLED_POLICY.logPassingPlans,
}
}
export function validateCompositionPlan(
input: SongPromptInput,
candidate: SongPlanCandidate
): SongPlanValidationResult {
const issues: SongPlanValidationIssue[] = []
const lyrics = getLyricsText(candidate)
const planText = getPlanText(candidate)
const totalDurationMs = getTotalDurationMs(candidate)
if (totalDurationMs > MAX_SONG_DURATION_MS) {
issues.push({
code: 'over_duration',
message: `Composition plan is ${totalDurationMs}ms, above the 60000ms limit.`,
evidenceType: 'duration',
})
}
if (!input.gameBreak) {
const badSection = candidate.sections.find((section) =>
GAME_BREAK_SECTION_RE.test(section.section_name)
)
if (badSection) {
issues.push({
code: 'unexpected_game_break_section',
message: `Section "${badSection.section_name}" looks like a game-break section, but this session has no game break.`,
evidenceType: 'game',
})
}
}
if (input.gameBreak) {
const gameCandidates = collectGameEvidenceCandidates(input)
if (gameCandidates.length > 0 && !containsAnyEvidence(planText, gameCandidates)) {
issues.push({
code: 'missing_game_detail',
message: `The song mentions the game break without using a concrete detail from ${input.gameBreak.gameName}.`,
evidenceType: 'game',
})
}
}
const actualNames = getAllowedPlayerNames(input.player.name)
if (!actualNames.some((name) => containsWord(lyrics, name))) {
issues.push({
code: 'missing_player_name',
message: `Lyrics do not include the actual player name "${input.player.name}".`,
evidenceType: 'player',
})
}
const inventedName = findInventedChildName(lyrics, actualNames)
if (inventedName) {
issues.push({
code: 'invented_child_name',
message: `Lyrics mention "${inventedName}", which is not the actual player name.`,
evidenceType: 'player',
})
}
const problemCandidates = collectProblemEvidenceCandidates(input)
if (problemCandidates.length > 0 && !containsAnyEvidence(lyrics, problemCandidates)) {
issues.push({
code: 'missing_problem_evidence',
message: 'Lyrics do not include a real problem expression or singable equivalent.',
evidenceType: 'problem',
})
}
const skillCandidates = collectSkillEvidenceCandidates(input)
if (skillCandidates.length > 0 && !containsAnyEvidence(lyrics, skillCandidates)) {
issues.push({
code: 'missing_skill_evidence',
message: 'Lyrics do not include a real skill or strategy from the session.',
evidenceType: 'skill',
})
}
const unsupportedNumericClaim = findUnsupportedNumericClaim(
planText,
collectAllowedNumbers(input)
)
if (unsupportedNumericClaim) {
issues.push({
code: 'invented_numeric_claim',
message: `Lyrics include unsupported concrete claim "${unsupportedNumericClaim}".`,
evidenceType: 'invented_fact',
})
}
const inventedGame = findInventedGameName(planText, input.gameBreak?.gameName)
if (inventedGame) {
issues.push({
code: 'invented_game',
message: `Lyrics mention "${inventedGame}", which was not the session game break.`,
evidenceType: 'invented_fact',
})
}
return {
ok: issues.length === 0,
issues,
totalDurationMs,
}
}
export function getTotalDurationMs(plan: CompositionPlan): number {
return plan.sections.reduce((sum, section) => sum + (section.duration_ms ?? 0), 0)
}
export function clampCompositionPlanDuration<T extends CompositionPlan>(plan: T): T {
const totalMs = getTotalDurationMs(plan)
if (totalMs <= MAX_SONG_DURATION_MS || totalMs <= 0) return clonePlan(plan)
const scale = MAX_SONG_DURATION_MS / totalMs
return {
...clonePlan(plan),
sections: plan.sections.map((section) => ({
...section,
duration_ms: Math.round(section.duration_ms * scale),
})),
}
}
export function buildFallbackSongPlan(
input: SongPromptInput,
original?: Partial<SongPlanCandidate>,
genre = 'any'
): SongPlanCandidate {
const firstName = getAllowedPlayerNames(input.player.name)[0] ?? input.player.name
const problem = input.practiceDrama.problemMoments[0]?.problem
const skill =
input.practiceDrama.problemMoments.flatMap((moment) => [
...moment.strategySteps,
...moment.skills,
])[0] ?? input.practiceDrama.skillSpotlights[0]?.skill
const gameDetail = collectGameEvidenceCandidates(input)[0]
const genres =
genre === 'any'
? []
: genre
.split(',')
.map((part) => part.trim())
.filter(Boolean)
const globalStyles = uniqueStrings([
'children',
'upbeat',
...genres,
...(original?.positive_global_styles ?? []),
]).slice(0, 8)
const sections: SongPlanCandidate['sections'] = [
{
section_name: 'Verse 1',
positive_local_styles: ['bright', 'storytelling'],
negative_local_styles: [],
duration_ms: 12_000,
lines: [
fitLine(`${firstName} took the bead road today`),
fitLine(problem ? `${problem} came into view` : 'A math trail came into view'),
],
},
{
section_name: 'Chorus',
positive_local_styles: ['catchy', 'singalong'],
negative_local_styles: [],
duration_ms: 9_000,
lines: [
fitLine(`${firstName}, keep that rhythm bright`),
'One more step and the beads feel light',
],
},
{
section_name: 'Verse 2',
positive_local_styles: ['warm', 'confident'],
negative_local_styles: [],
duration_ms: 12_000,
lines: [
fitLine(skill ? `Used ${skill} with steady hands` : 'Kept the practice moving strong'),
'Tried it again and carried on',
],
},
]
if (input.gameBreak) {
sections.push({
section_name: 'Game Break',
positive_local_styles: ['playful', 'rhythmic'],
negative_local_styles: [],
duration_ms: 8_000,
lines: [
fitLine(`${input.gameBreak.gameName} made a side quest`),
fitLine(gameDetail ?? input.gameBreak.headline),
],
})
}
sections.push({
section_name: 'Final Chorus',
positive_local_styles: ['celebration', 'singalong'],
negative_local_styles: [],
duration_ms: 9_000,
lines: [fitLine(`${firstName}, keep that rhythm bright`), 'Math steps shining in the light'],
})
return {
title: fitLine(`${firstName}'s Practice Beat`, 80),
positive_global_styles: globalStyles,
negative_global_styles: uniqueStrings([
'explicit',
'sad',
...(original?.negative_global_styles ?? []),
]).slice(0, 8),
sections,
}
}
export function buildValidationEvidenceSummary(input: SongPromptInput): string {
const lines = [
`Player name: ${input.player.name}`,
`Problems: ${input.practiceDrama.problemMoments.map((moment) => moment.problem).join(' | ') || 'none'}`,
`Skills/strategies: ${collectSkillEvidenceCandidates(input).slice(0, 12).join(' | ') || 'none'}`,
input.gameBreak
? `Game break: ${input.gameBreak.gameName} | ${collectGameEvidenceCandidates(input).slice(0, 12).join(' | ') || 'no concrete details'}`
: 'Game break: none',
]
return lines.join('\n')
}
function parseConfigString(raw: string): Record<string, unknown> | null {
try {
return asRecord(JSON.parse(raw))
} catch {
return null
}
}
function asRecord(value: unknown): Record<string, unknown> | null {
return value && typeof value === 'object' && !Array.isArray(value)
? (value as Record<string, unknown>)
: null
}
function isValidationMode(value: unknown): value is SongPlanValidationMode {
return value === 'off' || value === 'observe' || value === 'repair' || value === 'enforce'
}
function clonePlan<T extends CompositionPlan>(plan: T): T {
return {
...plan,
positive_global_styles: [...plan.positive_global_styles],
negative_global_styles: [...plan.negative_global_styles],
sections: plan.sections.map((section) => ({
...section,
positive_local_styles: [...section.positive_local_styles],
negative_local_styles: [...section.negative_local_styles],
lines: [...section.lines],
})),
}
}
function getLyricsText(candidate: SongPlanCandidate): string {
return candidate.sections.flatMap((section) => section.lines).join('\n')
}
function getPlanText(candidate: SongPlanCandidate): string {
return [
candidate.title,
candidate.positive_global_styles.join(' '),
candidate.sections
.map((section) => [section.section_name, section.lines.join(' ')].join(' '))
.join(' '),
].join('\n')
}
function normalizeCompact(value: string): string {
return value
.toLowerCase()
.replace(/[’']/g, '')
.replace(/[^a-z0-9]+/g, '')
}
function containsAnyEvidence(text: string, candidates: string[]): boolean {
const normalizedText = normalizeCompact(text)
return candidates.some((candidate) => {
const normalized = normalizeCompact(candidate)
return normalized.length >= 2 && normalizedText.includes(normalized)
})
}
function containsWord(text: string, word: string): boolean {
const escaped = word.replace(/[.*+?^${}()|[\]\\]/g, '\\$&')
return new RegExp(`(^|[^a-zA-Z])${escaped}([^a-zA-Z]|$)`, 'i').test(text)
}
function getAllowedPlayerNames(name: string): string[] {
const parts = name.split(/\s+/).filter(Boolean)
return uniqueStrings([name, parts[0]])
}
function findInventedChildName(lyrics: string, allowedNames: string[]): string | null {
const allowed = new Set(allowedNames.map((name) => name.toLowerCase()))
return COMMON_CHILD_NAMES.find((name) => !allowed.has(name) && containsWord(lyrics, name)) ?? null
}
function collectProblemEvidenceCandidates(input: SongPromptInput): string[] {
return uniqueStrings(
input.practiceDrama.problemMoments.flatMap((moment) => mathEvidenceVariants(moment.problem))
)
}
function collectSkillEvidenceCandidates(input: SongPromptInput): string[] {
return uniqueStrings([
...input.currentSession.skillsPracticed,
...input.practiceDrama.skillSpotlights.map((skill) => skill.skill),
...input.practiceDrama.problemMoments.flatMap((moment) => [
...moment.skills,
...moment.strategySteps.map(getSkillPhraseFromStrategyStep),
]),
]).flatMap((item) => skillEvidenceVariants(item))
}
function collectGameEvidenceCandidates(input: SongPromptInput): string[] {
const gameBreak = input.gameBreak
if (!gameBreak) return []
const rawDetails = [
gameBreak.headline,
gameBreak.outcome,
gameBreak.accuracy != null ? `${gameBreak.accuracy}% accuracy` : null,
...gameBreak.highlights,
...gameBreak.details,
...gameBreak.moments,
].filter((detail): detail is string => Boolean(detail?.trim()))
const gameNameCompact = normalizeCompact(gameBreak.gameName)
const candidates = rawDetails.flatMap((detail) => {
const withoutGame = detail.replace(new RegExp(escapeRegExp(gameBreak.gameName), 'gi'), ' ')
return [
withoutGame,
...withoutGame.split(/[|,;]/),
...withoutGame.split(':').slice(1),
...extractNumbers(withoutGame).flatMap((n) => [String(n), n >= 10 ? numberToWords(n) : '']),
]
})
return uniqueStrings(
candidates
.map((candidate) => candidate.replace(/\s+/g, ' ').trim())
.filter((candidate) => {
const compact = normalizeCompact(candidate)
return (
compact.length >= 3 && compact !== gameNameCompact && !/^(played|game)$/i.test(candidate)
)
})
)
}
function getSkillPhraseFromStrategyStep(step: string): string {
const usingMatch = step.match(/\busing\s+(.+)$/i)
return usingMatch?.[1]?.trim() ?? step
}
function skillEvidenceVariants(value: string): string[] {
const sourceLooksLikeEquation = /[=+-]/.test(value) && extractNumbers(value).length >= 2
return mathEvidenceVariants(value).filter((variant) => {
const normalized = normalizeCompact(variant)
if (normalized.length < 4) return false
if (/^\d+$/.test(normalized)) return sourceLooksLikeEquation
return !/^(?:plus|minus)?(?:\d+|one|two|three|four|five|six|seven|eight|nine|ten)$/.test(
normalized
)
})
}
function collectAllowedNumbers(input: SongPromptInput): Set<number> {
const values = [
input.currentSession.problemsDone,
input.currentSession.problemsTotal,
input.currentSession.bestCorrectStreak,
input.currentSession.durationMinutes,
input.currentSession.totalIncorrectAttempts,
input.currentSession.helpMoments,
input.currentSession.retryMoments,
input.currentSession.averageResponseSeconds,
Math.round(input.currentSession.accuracy * 100),
...input.practiceDrama.problemMoments.flatMap((moment) => [
moment.answer,
...moment.studentAnswers,
moment.attempts,
moment.incorrectAttempts,
moment.responseSeconds,
...extractNumbers(moment.problem),
...moment.strategySteps.flatMap(extractNumbers),
]),
...input.practiceDrama.skillSpotlights.flatMap((skill) => [
skill.attempts,
skill.correct,
skill.problems,
...skill.exampleProblems.flatMap(extractNumbers),
]),
input.gameBreak?.accuracy,
...(input.gameBreak
? [
...input.gameBreak.highlights,
...input.gameBreak.details,
...input.gameBreak.moments,
input.gameBreak.outcome ?? '',
].flatMap(extractNumbers)
: []),
]
return new Set(
values.filter((value): value is number => typeof value === 'number' && Number.isFinite(value))
)
}
function findUnsupportedNumericClaim(text: string, allowedNumbers: Set<number>): string | null {
const patterns = [
/\b(\d+)\s*(attempts?|tries|mistakes?|wrong|incorrect|scores?|points?|stars?|words?|notes?|regions?|countries?|numbers?|streak|in a row)\b/gi,
/\b(score|points|stars|attempts?|tries|words?|notes?|regions?|countries?)\s*(?:of|was|is|:)?\s*(\d+)\b/gi,
]
for (const pattern of patterns) {
for (const match of text.matchAll(pattern)) {
const numberText = /^\d+$/.test(match[1]) ? match[1] : match[2]
const value = Number(numberText)
if (Number.isFinite(value) && !allowedNumbers.has(value)) return match[0]
}
}
return null
}
function findInventedGameName(text: string, actualGameName?: string): string | null {
const actual = actualGameName ? normalizeCompact(actualGameName) : null
return (
KNOWN_GAME_NAMES.find((gameName) => {
if (actual && normalizeCompact(gameName) === actual) return false
return containsPhrase(text, gameName)
}) ?? null
)
}
function containsPhrase(text: string, phrase: string): boolean {
return normalizeCompact(text).includes(normalizeCompact(phrase))
}
function mathEvidenceVariants(value: string): string[] {
const trimmed = value.trim()
if (!trimmed) return []
const beforeEquals = trimmed.includes('=') ? trimmed.split('=')[0].trim() : ''
return uniqueStrings([
trimmed,
beforeEquals,
mathSymbolsToWords(trimmed, false),
beforeEquals ? mathSymbolsToWords(beforeEquals, false) : '',
mathSymbolsToWords(trimmed, true),
beforeEquals ? mathSymbolsToWords(beforeEquals, true) : '',
])
}
function mathSymbolsToWords(value: string, convertNumbers: boolean): string {
return value
.replace(/\+/g, ' plus ')
.replace(/-/g, ' minus ')
.replace(/=/g, ' equals ')
.replace(/\b\d+\b/g, (match) => (convertNumbers ? numberToWords(Number(match)) : match))
.replace(/\s+/g, ' ')
.trim()
}
function extractNumbers(value: string): number[] {
return [...value.matchAll(/\b\d+(?:\.\d+)?\b/g)]
.map((match) => Number(match[0]))
.filter((number) => Number.isFinite(number))
}
function numberToWords(value: number): string {
if (!Number.isInteger(value) || value < 0 || value > 999) return String(value)
const ones = [
'zero',
'one',
'two',
'three',
'four',
'five',
'six',
'seven',
'eight',
'nine',
'ten',
'eleven',
'twelve',
'thirteen',
'fourteen',
'fifteen',
'sixteen',
'seventeen',
'eighteen',
'nineteen',
]
const tens = [
'',
'',
'twenty',
'thirty',
'forty',
'fifty',
'sixty',
'seventy',
'eighty',
'ninety',
]
if (value < 20) return ones[value]
if (value < 100) {
const ten = Math.floor(value / 10)
const one = value % 10
return one === 0 ? tens[ten] : `${tens[ten]} ${ones[one]}`
}
const hundred = Math.floor(value / 100)
const remainder = value % 100
return remainder === 0
? `${ones[hundred]} hundred`
: `${ones[hundred]} hundred ${numberToWords(remainder)}`
}
function uniqueStrings(values: Array<string | null | undefined>): string[] {
const seen = new Set<string>()
const result: string[] = []
for (const value of values) {
const trimmed = value?.trim()
if (!trimmed) continue
const key = normalizeCompact(trimmed)
if (!key || seen.has(key)) continue
seen.add(key)
result.push(trimmed)
}
return result
}
function fitLine(value: string, max = 78): string {
const trimmed = value.replace(/\s+/g, ' ').trim()
return trimmed.length <= max ? trimmed : `${trimmed.slice(0, max - 1).trim()}`
}
function escapeRegExp(value: string): string {
return value.replace(/[.*+?^${}()|[\]\\]/g, '\\$&')
}
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