'use strict';

const knex = require('./knex');
const bulkInsert = require('./utils/bulk-insert');
const { HttpError } = require('./errors');

async function addAlert(alert, sessionUser) {
	if (!sessionUser) {
		throw new HttpError('You are not authenthicated', 401);
	}

	if (!alert.actors?.length > 0 && !alert.tags?.length > 0 && !alert.entity) {
		throw new HttpError('Alert must contain at least one actor, tag or entity', 400);
	}

	const [alertId] = await knex('alerts')
		.insert({
			user_id: sessionUser.id,
			notify: alert.notify,
			email: alert.email,
		})
		.returning('id');

	await Promise.all([
		alert.actors?.length > 0 && bulkInsert('alerts_actors', alert.actors.map((actorId) => ({
				alert_id: alertId,
				actor_id: actorId,
			})), false),
		alert.tags?.length > 0 && bulkInsert('alerts_tags', alert.tags.map((tagId) => ({
				alert_id: alertId,
				tag_id: tagId,
			})), false),
		alert.stashes?.length > 0 && bulkInsert('alerts_stashes', alert.stashes.map((stashId) => ({
				alert_id: alertId,
				stash_id: stashId,
			})), false),
		alert.entity && bulkInsert('alerts_entities', [{
			alert_id: alertId,
			entity_id: alert.entity,
		}], false),
	]);

	return alertId;
}

async function removeAlert(alertId) {
	await knex('alerts').where('id', alertId).delete();
}

async function notify(scenes) {
	const releases = await knex.raw(`
		SELECT alerts.id as alert_id, alerts.notify, alerts.email, releases.id as scene_id, users.id as user_id, COALESCE(json_agg(alerts_stashes.stash_id) FILTER (WHERE alerts_stashes.stash_id IS NOT NULL), '[]') as stashes
		FROM releases
		CROSS JOIN alerts
		LEFT JOIN users ON users.id = alerts.user_id
		LEFT JOIN alerts_stashes ON alerts_stashes.alert_id = alerts.id
		/* match updated IDs from input */
		WHERE (releases.id = ANY(:sceneIds))
		/* match tags */
		AND (NOT EXISTS (SELECT alerts_tags.alert_id
			FROM alerts_tags
			WHERE alerts_tags.alert_id = alerts.id)
		OR (SELECT array_agg(releases_tags.tag_id)
			FROM releases_tags
			WHERE releases_tags.release_id = releases.id
			GROUP BY releases_tags.release_id)
		@> (SELECT array_agg(alerts_tags.tag_id)
			FROM alerts_tags
			WHERE alerts_tags.alert_id = alerts.id
			GROUP BY alerts_tags.alert_id))
		/* match actors */
		AND (NOT EXISTS (SELECT alerts_actors.alert_id
			FROM alerts_actors
			WHERE alerts_actors.alert_id = alerts.id)
		OR (SELECT array_agg(releases_actors.actor_id)
			FROM releases_actors
			WHERE releases_actors.release_id = releases.id
			GROUP BY releases_actors.release_id)
		@> (SELECT array_agg(alerts_actors.actor_id)
			FROM alerts_actors
			WHERE alerts_actors.alert_id = alerts.id
			GROUP BY alerts_actors.alert_id))
		/* match entity */
		AND ((NOT EXISTS (SELECT alerts_entities.entity_id
			FROM alerts_entities
			WHERE alerts_entities.alert_id = alerts.id))
		OR (releases.entity_id
		= ANY(array(
			/* include children of entities */
			WITH RECURSIVE included AS (
				SELECT entities.*
				FROM alerts_entities
				LEFT JOIN entities ON entities.id = alerts_entities.entity_id
				WHERE alerts_entities.alert_id = alerts.id

				UNION ALL

				SELECT entities.*
				FROM entities
				INNER JOIN included ON included.id = entities.parent_id
			)

			SELECT included.id
			FROM included
			GROUP BY included.id
		))))
		GROUP BY releases.id, users.id, alerts.id;
	`, {
		sceneIds: scenes.map((scene) => scene.id),
	});

	const notifications = releases.rows
		.filter((alert) => alert.notify)
		.map((notification) => ({
			user_id: notification.user_id,
			alert_id: notification.alert_id,
			scene_id: notification.scene_id,
		}));

	const stashes = releases.rows
		.filter((release) => release.stashes.length > 0)
		.flatMap((release) => release.stashes.map((stash) => ({
			scene_id: release.scene_id,
			stash_id: stash,
		})));

	await Promise.all([
		bulkInsert('notifications', notifications, false),
		bulkInsert('stashes_scenes', stashes, false),
	]);

	return releases.rows;
}

async function updateNotification(notificationId, notification, sessionUser) {
	await knex('notifications')
		.where('user_id', sessionUser.id)
		.where('id', notificationId)
		.update({
			seen: notification.seen,
		});
}

async function updateNotifications(notification, sessionUser) {
	await knex('notifications')
		.where('user_id', sessionUser.id)
		.update({
			seen: notification.seen,
		});
}

module.exports = {
	addAlert,
	removeAlert,
	notify,
	updateNotification,
	updateNotifications,
};