import Vote from '../../../models/poll-vote';
import Note, { INote } from '../../../models/note';
import Watching from '../../../models/note-watching';
import watch from '../../../services/note/watch';
import { publishNoteStream } from '../../stream';
import notify from '../../../services/create-notification';
import { isLocalUser, IUser } from '../../../models/user';

export default (user: IUser, note: INote, choice: number) => new Promise(async (res, rej) => {
	if (!note.poll.choices.some(x => x.id == choice)) return rej('invalid choice param');

	// if already voted
	const exist = await Vote.find({
		noteId: note._id,
		userId: user._id
	});

	if (note.poll.multiple) {
		if (exist.some(x => x.choice === choice))
			return rej('already voted');
	} else if (exist.length) {
		return rej('already voted');
	}

	// Create vote
	await Vote.insert({
		createdAt: new Date(),
		noteId: note._id,
		userId: user._id,
		choice: choice
	});

	res();

	const inc: any = {};
	inc[`poll.choices.${note.poll.choices.findIndex(c => c.id == choice)}.votes`] = 1;

	// Increment votes count
	await Note.update({ _id: note._id }, {
		$inc: inc
	});

	publishNoteStream(note._id, 'pollVoted', {
		choice: choice,
		userId: user._id.toHexString()
	});

	// Notify
	notify(note.userId, user._id, 'poll_vote', {
		noteId: note._id,
		choice: choice
	});

	// Fetch watchers
	Watching
		.find({
			noteId: note._id,
			userId: { $ne: user._id },
			// 削除されたドキュメントは除く
			deletedAt: { $exists: false }
		}, {
			fields: {
				userId: true
			}
		})
		.then(watchers => {
			for (const watcher of watchers) {
				notify(watcher.userId, user._id, 'poll_vote', {
					noteId: note._id,
					choice: choice
				});
			}
		});

	// ローカルユーザーが投票した場合この投稿をWatchする
	if (isLocalUser(user) && user.settings.autoWatch !== false) {
		watch(user._id, note);
	}
});