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* Server-side projection for a shared celebration song.
*
* Single source of truth for what a share code reveals — used by the public
* API route (`/api/song-shares/[code]`), the public page (`/song/[code]`), and
* its OG image. The raw `promptInput` never leaves this function; only the
* fields the share's visibility toggles permit are returned, and the lyric
* annotation engine runs *here*, after the gate, fed only permitted facts.
* This is the privacy boundary for a child's data.
*/
import { eq, sql } from 'drizzle-orm'
import { db, schema } from '@/db'
import type {
SongProblemMoment,
SongSkillSpotlight,
} from '@/lib/session-song/extract-session-stats'
import {
type AnnotateFacts,
type AnnotatedSongSection,
annotateSections,
} from '@/lib/song-share/annotate'
import { formatSkill } from '@/lib/song-share/sessionFacts'
import { parseSongPlan } from '@/lib/song-share/songPlan'
import { DEFAULT_SONG_SHARE_VISIBILITY, type SongShareVisibility } from '@/db/schema/song-shares'
interface PromptInputShape {
player?: { name?: string; emoji?: string; age?: number }
currentSession?: {
accuracy?: number
problemsDone?: number
problemsTotal?: number
bestCorrectStreak?: number
skillsPracticed?: string[]
}
practiceDrama?: {
storyAngle?: string
arcs?: string[]
problemMoments?: SongProblemMoment[]
skillSpotlights?: SongSkillSpotlight[]
}
gameBreak?: { gameName?: string; headline?: string }
}
export interface SharedSongStats {
age?: number
accuracyPct?: number
problemsDone?: number
problemsTotal?: number
bestCorrectStreak?: number
skills?: string[]
storyAngle?: string
/** A few human "what happened this session" lines (gated by problem detail). */
highlights?: string[]
}
export interface SharedSongPayload {
player: { name: string; emoji: string }
song: {
/** The underlying session_songs row id — used by derived-asset routes
* (audio, alignment, preview MP4) that key on the file path
* data/audio/songs/{songId}.{ext}. Already exposed via audioPath; this
* field just saves callers from string-parsing the URL. */
id: string
title: string | null
audioPath: string
/** Sidecar JSON path served by /api/audio/songs/{id}/alignment, or null if not present. */
alignmentPath: string | null
styles: string[]
sections: AnnotatedSongSection[]
createdAt: number
}
stats: SharedSongStats
visibility: SongShareVisibility
}
/**
* Resolve a share code to its projected payload, or `null` if the code is
* missing/revoked or the song isn't a completed song (callers map null → 404).
*
* @param opts.bumpView increment the view counter (only the page render should;
* the OG image / API must not, or crawlers inflate the count)
*/
export async function getSharedSong(
code: string,
opts: { bumpView?: boolean } = {}
): Promise<SharedSongPayload | null> {
const [share] = await db
.select({
id: schema.songShares.id,
songId: schema.songShares.songId,
visibility: schema.songShares.visibility,
status: schema.songShares.status,
})
.from(schema.songShares)
.where(eq(schema.songShares.id, code))
.limit(1)
if (!share || share.status !== 'active') return null
const [song] = await db
.select({
id: schema.sessionSongs.id,
status: schema.sessionSongs.status,
playerId: schema.sessionSongs.playerId,
llmOutput: schema.sessionSongs.llmOutput,
promptInput: schema.sessionSongs.promptInput,
createdAt: schema.sessionSongs.createdAt,
})
.from(schema.sessionSongs)
.where(eq(schema.sessionSongs.id, share.songId))
.limit(1)
if (!song || song.status !== 'completed') return null
const [player] = await db
.select({ name: schema.players.name, emoji: schema.players.emoji })
.from(schema.players)
.where(eq(schema.players.id, song.playerId))
.limit(1)
if (opts.bumpView) {
try {
await db
.update(schema.songShares)
.set({ views: sql`${schema.songShares.views} + 1`, lastViewedAt: new Date() })
.where(eq(schema.songShares.id, code))
} catch (e) {
console.error('song-share view bump failed:', e)
}
}
// Legacy rows (written before a key was added to SongShareVisibility) lack
// newer fields in the JSON column — spread the default first so every key
// has a value before the page reads them.
const visibility: SongShareVisibility = {
...DEFAULT_SONG_SHARE_VISIBILITY,
...(share.visibility as Partial<SongShareVisibility>),
}
return projectSharedSong({
visibility,
llmOutput: song.llmOutput,
promptInput: song.promptInput,
playerName: player?.name ?? 'A learner',
playerEmoji: player?.emoji ?? '🧮',
songId: song.id,
createdAt: song.createdAt instanceof Date ? song.createdAt.getTime() : song.createdAt,
})
}
/**
* The privacy projection itself — pure, no I/O. Separated from the DB reads so
* the toggle-gating contract can be unit-tested directly (and so the boundary
* has exactly one implementation). `promptInput`/`llmOutput` come straight off
* the row as `unknown`; nothing here returns them verbatim.
*/
export function projectSharedSong(input: {
visibility: SongShareVisibility
llmOutput: unknown
promptInput: unknown
playerName: string
playerEmoji: string
songId: string
createdAt: number
}): SharedSongPayload {
const { visibility, playerName, playerEmoji, songId, createdAt } = input
const plan = parseSongPlan(input.llmOutput)
const pi = (input.promptInput ?? {}) as PromptInputShape
const firstName = playerName.trim().split(/\s+/)[0] || playerName
// ---- Projection (privacy boundary) ----
const stats: SharedSongStats = {}
if (visibility.showAge && typeof pi.player?.age === 'number') {
stats.age = pi.player.age
}
if (visibility.showAccuracy && pi.currentSession) {
if (typeof pi.currentSession.accuracy === 'number') {
stats.accuracyPct = Math.round(pi.currentSession.accuracy * 100)
}
if (typeof pi.currentSession.problemsDone === 'number') {
stats.problemsDone = pi.currentSession.problemsDone
}
if (typeof pi.currentSession.problemsTotal === 'number') {
stats.problemsTotal = pi.currentSession.problemsTotal
}
}
const rawSkills = Array.isArray(pi.currentSession?.skillsPracticed)
? pi.currentSession!.skillsPracticed!
: []
if (visibility.showStreakSkills && pi.currentSession) {
if (typeof pi.currentSession.bestCorrectStreak === 'number') {
stats.bestCorrectStreak = pi.currentSession.bestCorrectStreak
}
if (rawSkills.length > 0) {
stats.skills = rawSkills.map(formatSkill).slice(0, 8)
}
}
if (visibility.showProblemDetail && typeof pi.practiceDrama?.storyAngle === 'string') {
stats.storyAngle = pi.practiceDrama.storyAngle
}
if (visibility.showProblemDetail && Array.isArray(pi.practiceDrama?.arcs)) {
const arcs = pi.practiceDrama.arcs.filter(
(a): a is string => typeof a === 'string' && !!a.trim()
)
if (arcs.length > 0) stats.highlights = arcs.slice(0, 3)
}
// ---- Gated facts for the lyric annotation engine ----
const facts: AnnotateFacts = { playerName: firstName }
if (visibility.showProblemDetail) {
if (Array.isArray(pi.practiceDrama?.problemMoments)) {
facts.problemMoments = pi.practiceDrama.problemMoments
}
if (typeof pi.practiceDrama?.storyAngle === 'string') {
facts.storyAngle = pi.practiceDrama.storyAngle
}
if (pi.gameBreak?.gameName) {
facts.gameBreak = { gameName: pi.gameBreak.gameName, headline: pi.gameBreak.headline }
}
}
if (visibility.showStreakSkills) {
if (Array.isArray(pi.practiceDrama?.skillSpotlights)) {
facts.skillSpotlights = pi.practiceDrama.skillSpotlights
}
if (rawSkills.length > 0) facts.skills = rawSkills
}
return {
player: {
name: playerName,
emoji: playerEmoji,
},
song: {
id: songId,
title: plan.title,
audioPath: `/api/audio/songs/${songId}`,
// Alignment sidecar — route 404s gracefully for legacy songs without timestamps,
// and the player falls back to static lyrics in that case.
alignmentPath: `/api/audio/songs/${songId}/alignment`,
styles: plan.globalStyles,
sections: annotateSections(plan.sections, facts),
createdAt,
},
stats,
visibility,
}
}
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