| 1 | /** |
| 2 | * What was said over a span, counted (`activity`, for Home). Pure, so the |
| 3 | * counting is tested apart from the service: the service reads one row per |
| 4 | * (conversation, author) with how many messages, over the conversations |
| 5 | * the viewer can read, and this adds them up. |
| 6 | */ |
| 7 | |
| 8 | import type { ChatActivity } from "@g1t/contracts"; |
| 9 | |
| 10 | /** One conversation's messages by one author in the span. */ |
| 11 | export type ActivityRow = { channel_id: string; author: string; n: number }; |
| 12 | |
| 13 | /** Messages, conversations with any, and who said how much, most first. */ |
| 14 | export function chatActivity(rows: ActivityRow[], span: { from: string; until: string }): ChatActivity { |
| 15 | const channels = new Set<string>(); |
| 16 | const byAuthor = new Map<string, number>(); |
| 17 | let messages = 0; |
| 18 | for (const row of rows) { |
| 19 | const n = Math.max(0, Math.floor(Number(row.n) || 0)); |
| 20 | if (n === 0) continue; |
| 21 | messages += n; |
| 22 | channels.add(row.channel_id); |
| 23 | byAuthor.set(row.author, (byAuthor.get(row.author) ?? 0) + n); |
| 24 | } |
| 25 | const authors = [...byAuthor] |
| 26 | .map(([key, count]) => ({ key, messages: count })) |
| 27 | .sort((a, b) => b.messages - a.messages || a.key.localeCompare(b.key)); |
| 28 | return { from: span.from, until: span.until, messages, channels: channels.size, authors }; |
| 29 | } |
| 30 | |
| 31 | /** |
| 32 | * The span as a pair of RFC 3339 times, or null when either is not a time |
| 33 | * or the span is empty. |
| 34 | */ |
| 35 | export function activitySpan(from: unknown, until: unknown): { from: string; until: string; fromMs: number; untilMs: number } | null { |
| 36 | if (typeof from !== "string" || typeof until !== "string") return null; |
| 37 | const fromMs = Date.parse(from); |
| 38 | const untilMs = Date.parse(until); |
| 39 | if (!Number.isFinite(fromMs) || !Number.isFinite(untilMs) || untilMs <= fromMs) return null; |
| 40 | return { from, until, fromMs, untilMs }; |
| 41 | } |