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Check idempotency (existing song for this session plan) * 2. Create session_songs record * 3. Extract session stats * 4. Generate LLM composition plan (structured lyrics + style) * 5. Generate music via ElevenLabs Music API * 6. Save MP3 locally, mark completed, emit Socket.IO event */ import { and, desc, eq, sql } from 'drizzle-orm' import { mkdir, writeFile } from 'fs/promises' import { dirname, join } from 'path' import { db, schema } from '@/db' import type { PlayerSessionPreferencesConfig } from '@/db/schema/player-session-preferences' import type { SessionSong, SessionSongLLMOutput, SessionSongTriggerSource, } from '@/db/schema/session-songs' import { AiFeature } from '@/lib/ai-usage/features' import { recordElevenLabsUsage } from '@/lib/ai-usage/helpers' import { getFlag } from '@/lib/feature-flags' import { getSocketIO } from '@/lib/socket-io' import { type CompositionPlan, generateMusic, type MusicAlignmentJson, } from '../elevenlabs/music-client' import { classifySongFailure } from '../session-song/classify-failure' import { resolveSongPlanValidationPolicy, SESSION_SONG_PLAN_VALIDATION_FLAG, SongCompositionValidationError, type SongPlanValidationPolicy, } from '../session-song/composition-plan-validation' import { resolveSongGenres, selectSongConcept } from '../session-song/concept-selector' import { extractSessionStats, type SongPromptInput } from '../session-song/extract-session-stats' import { generateSongPrompt, type SongCompositionOutput } from '../session-song/prompt-generator' import { createTask, type TaskHandle } from '../task-manager' import type { SessionSongEvent } from './events' // ============================================================================ // Types // ============================================================================ export interface SessionSongInput { sessionPlanId: string playerId: string triggerSource: SessionSongTriggerSource _userId?: string } export interface SessionSongOutput { songId: string status: string } export type SessionSongRegenerationMode = 'auto' | 'reuse_prompt' | 'regenerate_prompt' interface SongPromptBuildResult { playerName: string disabled: boolean promptInput?: SongPromptInput genrePreference?: string } const SONGS_DIR = join(process.cwd(), 'data', 'audio', 'songs') /** * Write the ElevenLabs word-alignment JSON to a sidecar file next to the MP3. * The detailed music endpoint returns this when `with_timestamps: true` is set; * it powers karaoke-style lyric highlighting in the celebration UI. */ async function writeAlignmentSidecar( songId: string, alignment: MusicAlignmentJson | null ): Promise<void> { if (!alignment) return const alignmentPath = join(SONGS_DIR, `${songId}.json`) await writeFile(alignmentPath, JSON.stringify(alignment)) } function asRecord(value: unknown): Record<string, unknown> | null { return value && typeof value === 'object' && !Array.isArray(value) ? (value as Record<string, unknown>) : null } function nestedRecord(value: unknown, key: string): Record<string, unknown> | null { return asRecord(asRecord(value)?.[key]) } function stringArray(value: unknown): string[] { return Array.isArray(value) ? value.filter((item): item is string => typeof item === 'string') : [] } function getRecentSongConceptIds( songs: Array<{ promptInput: unknown; llmOutput: unknown }> ): string[] { return songs .map((song) => { const promptConcept = nestedRecord(song.promptInput, 'songConcept') const outputConcept = nestedRecord(song.llmOutput, 'songConcept') return promptConcept?.id ?? outputConcept?.id }) .filter((id): id is string => typeof id === 'string' && id.length > 0) } function getRecentSongGenreTags(songs: Array<{ llmOutput: unknown }>): string[] { return songs.flatMap((song) => { const plan = nestedRecord(song.llmOutput, 'plan') return stringArray(plan?.positive_global_styles) }) } function seedPart(value: unknown): string { if (value instanceof Date) return String(value.getTime()) if (value == null) return '' return String(value) } function buildConceptSeed( input: SessionSongInput, plan: { createdAt?: unknown; completedAt?: unknown } ) { return [input.playerId, input.sessionPlanId, seedPart(plan.completedAt), seedPart(plan.createdAt)] .filter(Boolean) .join(':') } async function getSongPlanValidationPolicy(userId?: string): Promise<SongPlanValidationPolicy> { try { const flag = await getFlag(SESSION_SONG_PLAN_VALIDATION_FLAG, userId ? { userId } : undefined) return resolveSongPlanValidationPolicy(flag) } catch (error) { console.error('[session-song] Failed to load plan-validation feature flag:', error) return resolveSongPlanValidationPolicy(null) } } function getCompositionPlan(llmOutput: unknown): CompositionPlan | null { const output = asRecord(llmOutput) const plan = asRecord(output?.plan) if (!plan) return null if (!Array.isArray(plan.positive_global_styles)) return null if (!Array.isArray(plan.negative_global_styles)) return null if (!Array.isArray(plan.sections)) return null return plan as unknown as CompositionPlan } function getSongTitle(llmOutput: unknown): string | null { const title = asRecord(llmOutput)?.title return typeof title === 'string' ? title : null } async function getPlayerName(playerId: string): Promise<string> { const [player] = await db .select({ name: schema.players.name }) .from(schema.players) .where(eq(schema.players.id, playerId)) .limit(1) return player?.name ?? 'Unknown player' } async function buildSongPromptInput(input: SessionSongInput): Promise<SongPromptBuildResult> { const [plan] = await db .select() .from(schema.sessionPlans) .where(eq(schema.sessionPlans.id, input.sessionPlanId)) .limit(1) const [player] = await db .select() .from(schema.players) .where(eq(schema.players.id, input.playerId)) .limit(1) if (!plan || !player) { throw new Error('Session plan or player not found') } const [prefRow] = await db .select() .from(schema.playerSessionPreferences) .where(eq(schema.playerSessionPreferences.playerId, input.playerId)) .limit(1) const prefs = prefRow ? (JSON.parse(prefRow.config) as PlayerSessionPreferencesConfig) : null const studentSongEnabled = prefs?.sessionSongEnabled ?? true if (!studentSongEnabled) { return { playerName: player.name, disabled: true } } const rawGenre = prefs?.sessionSongGenre ?? 'shuffle' const recentPlans = await db .select() .from(schema.sessionPlans) .where( and( eq(schema.sessionPlans.playerId, input.playerId), eq(schema.sessionPlans.status, 'completed') ) ) .orderBy(schema.sessionPlans.createdAt) .limit(10) const recentSessions = recentPlans.map((p) => { const results = (p as { results: Array<{ isCorrect: boolean }> }).results ?? [] const correct = results.filter((r) => r.isCorrect).length return { accuracy: results.length > 0 ? correct / results.length : 0, } }) const recentSongs = await db .select({ promptInput: schema.sessionSongs.promptInput, llmOutput: schema.sessionSongs.llmOutput, }) .from(schema.sessionSongs) .where( and( eq(schema.sessionSongs.playerId, input.playerId), eq(schema.sessionSongs.status, 'completed') ) ) .orderBy(desc(schema.sessionSongs.createdAt)) .limit(10) const [gameBreakResult] = await db .select() .from(schema.gameResults) .where( and( eq(schema.gameResults.sessionId, input.sessionPlanId), eq(schema.gameResults.sessionType, 'practice-break') ) ) .limit(1) const stats = extractSessionStats(plan as never, player, recentSessions, gameBreakResult, { breakSelectedGame: plan.breakSelectedGame ?? null, breakReason: plan.breakReason ?? null, breakResults: plan.breakResults ?? null, }) const conceptContext = { seed: buildConceptSeed(input, plan), recentConceptIds: getRecentSongConceptIds(recentSongs), recentGenreTags: getRecentSongGenreTags(recentSongs), genrePreference: rawGenre, } const songConcept = selectSongConcept(stats, conceptContext) const genrePreference = resolveSongGenres(rawGenre, songConcept, conceptContext) return { playerName: player.name, disabled: false, promptInput: { ...stats, songConcept }, genrePreference, } } async function emitSongReady(input: SessionSongInput, songId: string) { try { const io = await getSocketIO() if (io) { io.emit(`session-song:ready:${input.sessionPlanId}`, { songId, planId: input.sessionPlanId, }) } } catch { // Socket.IO not available — client will pick up via polling } } async function generateAndSaveMusic({ songId, input, handle, llmOutput, markContentResolved = false, }: { songId: string input: SessionSongInput handle: TaskHandle<SessionSongOutput, SessionSongEvent> llmOutput: SongCompositionOutput | Pick<SessionSongLLMOutput, 'title' | 'plan'> markContentResolved?: boolean }) { handle.emit({ type: 'song_generating_music' }) handle.setProgress(60, 'Creating your music...') await db .update(schema.sessionSongs) .set({ status: 'generating', errorMessage: null, failureKind: null, }) .where(eq(schema.sessionSongs.id, songId)) const { audioBuffer, alignment } = await generateMusic({ compositionPlan: llmOutput.plan, }) if (input._userId) { recordElevenLabsUsage(llmOutput.plan, { userId: input._userId, feature: AiFeature.MUSIC_GENERATE, backgroundTaskId: handle.id, }) } handle.setProgress(90, 'Saving your song...') const localPath = join(SONGS_DIR, `${songId}.mp3`) await mkdir(dirname(localPath), { recursive: true }) await writeFile(localPath, audioBuffer) await writeAlignmentSidecar(songId, alignment) await db .update(schema.sessionSongs) .set({ status: 'completed', localFilePath: localPath, completedAt: new Date(), errorMessage: null, failureKind: null, ...(markContentResolved ? { contentReviewStatus: 'resolved' } : {}), }) .where(eq(schema.sessionSongs.id, songId)) await emitSongReady(input, songId) handle.complete({ songId, status: 'completed' }) } async function notifyAdminsOfSongFailure({ songId, input, playerName, failureKind, }: { songId: string input: SessionSongInput playerName: string failureKind: string }) { try { const admins = await db .select({ id: schema.users.id }) .from(schema.users) .where(eq(schema.users.role, 'admin')) if (admins.length === 0) return const [{ bootstrapChannels }, { notifyUser }] = await Promise.all([ import('@/lib/notifications/bootstrap'), import('@/lib/notifications/dispatcher'), ]) bootstrapChannels() const event = { type: 'admin-song-failed' as const, data: { songId, sessionPlanId: input.sessionPlanId, playerId: input.playerId, playerName, failureKind, adminUrl: '/admin/songs', }, } const results = await Promise.allSettled(admins.map((admin) => notifyUser(admin.id, event))) const failures = results.filter((result) => result.status === 'rejected') if (failures.length > 0) { console.error( `[session-song] Failed to notify ${failures.length} admin(s) about song failure` ) } } catch (error) { console.error('[session-song] Failed to notify admins about song failure:', error) } } // ============================================================================ // Handler // ============================================================================ /** * Start a session song generation background task. * * Idempotent — returns existing song if one already exists for this plan. * * @returns The background task ID */ export async function startSessionSongGeneration( input: SessionSongInput, userId?: string ): Promise<{ taskId: string; songId?: string; existing?: boolean }> { // Check for existing song (idempotency) const existing = await db .select() .from(schema.sessionSongs) .where(eq(schema.sessionSongs.sessionPlanId, input.sessionPlanId)) .limit(1) if (existing.length > 0) { return { taskId: existing[0].backgroundTaskId ?? '', songId: existing[0].id, existing: true, } } // Create the song record first so we can reference its ID const [songRecord] = await db .insert(schema.sessionSongs) .values({ sessionPlanId: input.sessionPlanId, playerId: input.playerId, triggerSource: input.triggerSource, status: 'pending', }) .returning() const songId = songRecord.id const inputWithUser = { ...input, _userId: userId } const taskId = await createTask<SessionSongInput, SessionSongOutput, SessionSongEvent>( 'session-song', inputWithUser, async (handle) => { let playerNameForFailure = 'Unknown player' try { // Step 1: Extract stats handle.emit({ type: 'song_extracting_stats' }) handle.setProgress(10, 'Analyzing session data...') const [plan] = await db .select() .from(schema.sessionPlans) .where(eq(schema.sessionPlans.id, input.sessionPlanId)) .limit(1) const [player] = await db .select() .from(schema.players) .where(eq(schema.players.id, input.playerId)) .limit(1) if (!plan || !player) { throw new Error('Session plan or player not found') } playerNameForFailure = player.name // Check per-student preference const [prefRow] = await db .select() .from(schema.playerSessionPreferences) .where(eq(schema.playerSessionPreferences.playerId, input.playerId)) .limit(1) const prefs = prefRow ? (JSON.parse(prefRow.config) as PlayerSessionPreferencesConfig) : null const studentSongEnabled = prefs?.sessionSongEnabled ?? true if (!studentSongEnabled) { // Student has songs disabled — complete silently handle.complete({ songId, status: 'disabled' }) await db .update(schema.sessionSongs) .set({ status: 'failed', errorMessage: 'Songs disabled for this student' }) .where(eq(schema.sessionSongs.id, songId)) return } const rawGenre = prefs?.sessionSongGenre ?? 'shuffle' // Get recent completed sessions for history const recentPlans = await db .select() .from(schema.sessionPlans) .where( and( eq(schema.sessionPlans.playerId, input.playerId), eq(schema.sessionPlans.status, 'completed') ) ) .orderBy(schema.sessionPlans.createdAt) .limit(10) const recentSessions = recentPlans.map((p) => { const results = (p as { results: Array<{ isCorrect: boolean }> }).results ?? [] const correct = results.filter((r) => r.isCorrect).length return { accuracy: results.length > 0 ? correct / results.length : 0, } }) const recentSongs = await db .select({ promptInput: schema.sessionSongs.promptInput, llmOutput: schema.sessionSongs.llmOutput, }) .from(schema.sessionSongs) .where( and( eq(schema.sessionSongs.playerId, input.playerId), eq(schema.sessionSongs.status, 'completed') ) ) .orderBy(desc(schema.sessionSongs.createdAt)) .limit(10) // Look up game break result for this session (if any). // The smart trigger only fires in the last practice part, so game break // results (which happen between parts) are already persisted by now. const [gameBreakResult] = await db .select() .from(schema.gameResults) .where( and( eq(schema.gameResults.sessionId, input.sessionPlanId), eq(schema.gameResults.sessionType, 'practice-break') ) ) .limit(1) const stats = extractSessionStats(plan as never, player, recentSessions, gameBreakResult, { breakSelectedGame: plan.breakSelectedGame ?? null, breakReason: plan.breakReason ?? null, breakResults: plan.breakResults ?? null, }) const conceptContext = { seed: buildConceptSeed(input, plan), recentConceptIds: getRecentSongConceptIds(recentSongs), recentGenreTags: getRecentSongGenreTags(recentSongs), genrePreference: rawGenre, } const songConcept = selectSongConcept(stats, conceptContext) const genrePreference = resolveSongGenres(rawGenre, songConcept, conceptContext) const promptInput = { ...stats, songConcept } // Update song record with prompt input await db .update(schema.sessionSongs) .set({ promptInput: promptInput as unknown as Record<string, unknown>, status: 'prompt_generating', }) .where(eq(schema.sessionSongs.id, songId)) // Step 2: Generate LLM composition plan handle.emit({ type: 'song_generating_prompt' }) handle.setProgress(30, 'Writing your song...') const validationPolicy = await getSongPlanValidationPolicy(input._userId) const llmOutput = await generateSongPrompt(promptInput, genrePreference, input._userId, { validationPolicy, }) handle.emit({ type: 'song_prompt_ready', title: llmOutput.title, }) handle.setProgress(50, 'Song lyrics ready!') // Update song record with LLM output await db .update(schema.sessionSongs) .set({ llmOutput: llmOutput as unknown as Record<string, unknown>, }) .where(eq(schema.sessionSongs.id, songId)) // Step 3: Generate music via ElevenLabs handle.emit({ type: 'song_generating_music' }) handle.setProgress(60, 'Creating your music...') await db .update(schema.sessionSongs) .set({ status: 'generating' }) .where(eq(schema.sessionSongs.id, songId)) const { audioBuffer, alignment } = await generateMusic({ compositionPlan: llmOutput.plan, }) if (input._userId) { recordElevenLabsUsage(llmOutput.plan, { userId: input._userId, feature: AiFeature.MUSIC_GENERATE, backgroundTaskId: handle.id, }) } // Step 4: Save MP3 (and alignment JSON sidecar) locally handle.setProgress(90, 'Saving your song...') const localPath = join(SONGS_DIR, `${songId}.mp3`) await mkdir(dirname(localPath), { recursive: true }) await writeFile(localPath, audioBuffer) await writeAlignmentSidecar(songId, alignment) // Step 5: Mark completed await db .update(schema.sessionSongs) .set({ status: 'completed', localFilePath: localPath, completedAt: new Date(), }) .where(eq(schema.sessionSongs.id, songId)) // Emit Socket.IO event for instant client notification try { const io = await getSocketIO() if (io) { io.emit(`session-song:ready:${input.sessionPlanId}`, { songId, planId: input.sessionPlanId, }) } } catch { // Socket.IO not available — client will pick up via polling } handle.complete({ songId, status: 'completed' }) } catch (error) { const message = error instanceof Error ? error.message : 'Unknown error' const classified = classifySongFailure(error) const blockedOutput = error instanceof SongCompositionValidationError && error.candidate ? { title: error.candidate.title, plan: { positive_global_styles: error.candidate.positive_global_styles, negative_global_styles: error.candidate.negative_global_styles, sections: error.candidate.sections, }, validation: error.metadata, } : null handle.emit({ type: 'song_error', error: message }) // Update song record with error + classification await db .update(schema.sessionSongs) .set({ status: 'failed', errorMessage: message, failureKind: classified.kind, ...(blockedOutput && { llmOutput: blockedOutput as unknown as Record<string, unknown>, }), }) .where(eq(schema.sessionSongs.id, songId)) await notifyAdminsOfSongFailure({ songId, input, playerName: playerNameForFailure, failureKind: classified.kind, }) handle.fail(message) } }, userId ) // Link the background task ID to the song record await db .update(schema.sessionSongs) .set({ backgroundTaskId: taskId }) .where(eq(schema.sessionSongs.id, songId)) return { taskId, songId } } export interface RetrySessionSongOptions { mode?: SessionSongRegenerationMode reason?: string userId?: string } function isSongActive(status: string): boolean { return status === 'pending' || status === 'prompt_generating' || status === 'generating' } function resolveRetryMode( song: SessionSong, requestedMode: SessionSongRegenerationMode ): Exclude<SessionSongRegenerationMode, 'auto'> { if (requestedMode === 'auto') { return getCompositionPlan(song.llmOutput) ? 'reuse_prompt' : 'regenerate_prompt' } return requestedMode } function getValidationBlockedOutput(error: unknown) { if (!(error instanceof SongCompositionValidationError) || !error.candidate) { return null } return { title: error.candidate.title, plan: { positive_global_styles: error.candidate.positive_global_styles, negative_global_styles: error.candidate.negative_global_styles, sections: error.candidate.sections, }, validation: error.metadata, } } /** * Retry or regenerate an existing song without deleting the row. * * This keeps the failed song row as the durable queue: * - LLM failures retain promptInput and can regenerate lyrics later. * - ElevenLabs failures retain llmOutput.plan and can resume at music generation. * - Flagged completed songs can regenerate lyrics/music after prompt fixes ship. */ export async function retrySessionSongGeneration( songId: string, options: RetrySessionSongOptions = {} ): Promise<{ taskId: string songId: string mode: Exclude<SessionSongRegenerationMode, 'auto'> }> { const [song] = await db .select() .from(schema.sessionSongs) .where(eq(schema.sessionSongs.id, songId)) .limit(1) if (!song) { throw new Error('Song not found') } if (isSongActive(song.status)) { throw new Error(`Song is already ${song.status}`) } const mode = resolveRetryMode(song, options.mode ?? 'auto') const reusablePlan = getCompositionPlan(song.llmOutput) if (mode === 'reuse_prompt' && !reusablePlan) { throw new Error('No saved composition plan is available; regenerate lyrics instead') } const retryReason = options.reason ?? (mode === 'reuse_prompt' ? 'Retry from saved composition plan' : 'Regenerate lyrics and music') const markContentResolved = song.contentReviewStatus === 'flagged' && mode === 'regenerate_prompt' const inputWithUser: SessionSongInput = { sessionPlanId: song.sessionPlanId, playerId: song.playerId, triggerSource: (song.triggerSource as SessionSongTriggerSource | null) ?? 'completion_fallback', _userId: options.userId, } await db .update(schema.sessionSongs) .set({ status: 'pending', errorMessage: null, failureKind: null, backgroundTaskId: null, lastRegenerationReason: retryReason, lastRegenerationAt: new Date(), regenerationCount: sql`${schema.sessionSongs.regenerationCount} + 1`, ...(mode === 'regenerate_prompt' ? { llmOutput: null } : {}), }) .where(eq(schema.sessionSongs.id, songId)) const taskId = await createTask<SessionSongInput, SessionSongOutput, SessionSongEvent>( 'session-song', inputWithUser, async (handle) => { let playerNameForFailure = await getPlayerName(song.playerId) try { if (mode === 'reuse_prompt') { const title = getSongTitle(song.llmOutput) ?? 'Session song' handle.emit({ type: 'song_prompt_ready', title }) handle.setProgress(50, 'Song lyrics ready!') await generateAndSaveMusic({ songId, input: inputWithUser, handle, llmOutput: { title, plan: reusablePlan! }, markContentResolved, }) return } handle.emit({ type: 'song_extracting_stats' }) handle.setProgress(10, 'Analyzing session data...') const built = await buildSongPromptInput(inputWithUser) playerNameForFailure = built.playerName if (built.disabled) { handle.complete({ songId, status: 'disabled' }) await db .update(schema.sessionSongs) .set({ status: 'failed', errorMessage: 'Songs disabled for this student', failureKind: 'unknown', }) .where(eq(schema.sessionSongs.id, songId)) return } if (!built.promptInput || !built.genrePreference) { throw new Error('Failed to build song prompt input') } await db .update(schema.sessionSongs) .set({ promptInput: built.promptInput as unknown as Record<string, unknown>, status: 'prompt_generating', errorMessage: null, failureKind: null, }) .where(eq(schema.sessionSongs.id, songId)) handle.emit({ type: 'song_generating_prompt' }) handle.setProgress(30, 'Writing your song...') const validationPolicy = await getSongPlanValidationPolicy(inputWithUser._userId) const llmOutput = await generateSongPrompt( built.promptInput, built.genrePreference, inputWithUser._userId, { validationPolicy } ) handle.emit({ type: 'song_prompt_ready', title: llmOutput.title, }) handle.setProgress(50, 'Song lyrics ready!') await db .update(schema.sessionSongs) .set({ llmOutput: llmOutput as unknown as Record<string, unknown>, }) .where(eq(schema.sessionSongs.id, songId)) await generateAndSaveMusic({ songId, input: inputWithUser, handle, llmOutput, markContentResolved, }) } catch (error) { const message = error instanceof Error ? error.message : 'Unknown error' const classified = classifySongFailure(error) const blockedOutput = getValidationBlockedOutput(error) handle.emit({ type: 'song_error', error: message }) await db .update(schema.sessionSongs) .set({ status: 'failed', errorMessage: message, failureKind: classified.kind, ...(blockedOutput && { llmOutput: blockedOutput as unknown as Record<string, unknown>, }), }) .where(eq(schema.sessionSongs.id, songId)) await notifyAdminsOfSongFailure({ songId, input: inputWithUser, playerName: playerNameForFailure, failureKind: classified.kind, }) handle.fail(message) } }, options.userId ) await db .update(schema.sessionSongs) .set({ backgroundTaskId: taskId }) .where(eq(schema.sessionSongs.id, songId)) return { taskId, songId, mode } } |