yumechi-no-kuni/src/server/api/endpoints/notes/conversation.ts

import $ from 'cafy'; import ID from '../../../../misc/cafy-id';
import Note, { pack, INote } from '../../../../models/note';
import { ILocalUser } from '../../../../models/user';

/**
 * Show conversation of a note
 */
export default (params: any, user: ILocalUser) => new Promise(async (res, rej) => {
	// Get 'noteId' parameter
	const [noteId, noteIdErr] = $.type(ID).get(params.noteId);
	if (noteIdErr) return rej('invalid noteId param');

	// Get 'limit' parameter
	const [limit = 10, limitErr] = $.num.optional.range(1, 100).get(params.limit);
	if (limitErr) return rej('invalid limit param');

	// Get 'offset' parameter
	const [offset = 0, offsetErr] = $.num.optional.min(0).get(params.offset);
	if (offsetErr) return rej('invalid offset param');

	// Lookup note
	const note = await Note.findOne({
		_id: noteId
	});

	if (note === null) {
		return rej('note not found');
	}

	const conversation: INote[] = [];
	let i = 0;

	async function get(id: any) {
		i++;
		const p = await Note.findOne({ _id: id });

		if (i > offset) {
			conversation.push(p);
		}

		if (conversation.length == limit) {
			return;
		}

		if (p.replyId) {
			await get(p.replyId);
		}
	}

	if (note.replyId) {
		await get(note.replyId);
	}

	// Serialize
	res(await Promise.all(conversation.map(note => pack(note, user))));
});