exports.up = async function(knex) {
	await knex.schema.alterTable('notifications', (table) => {
		table.datetime('seen_at');
	});

	await knex.schema.alterTable('alerts', (table) => {
		table.boolean('is_expired')
			.notNullable()
			.defaultTo(false);
	});

	await knex.schema.createMaterializedView('alerts_users_scenes', (view) => {
		view.columns('user_id', 'scene_id', 'alert_ids');

		view.as(
			knex('alerts_scenes')
				.select(
					'alerts.user_id',
					'alerts_scenes.scene_id',
					knex.raw('array_agg(distinct alerts.id) as alert_ids'),
					knex.raw('(alerts_tags.id is null and alerts_entities.id is null and alerts_matches.id is null and related_scenes.id is null) as is_only'),
				)
				.leftJoin('alerts', 'alerts.id', 'alerts_scenes.alert_id')
				.leftJoin('alerts_entities', 'alerts_entities.alert_id', 'alerts_scenes.alert_id')
				.leftJoin('alerts_tags', 'alerts_tags.alert_id', 'alerts_scenes.alert_id')
				.leftJoin('alerts_matches', 'alerts_matches.alert_id', 'alerts_scenes.alert_id')
				.leftJoin('alerts_scenes as related_scenes', (joinBuilder) => {
					joinBuilder
						.on('related_scenes.alert_id', 'alerts_scenes.alert_id')
						.on('related_scenes.scene_id', '!=', 'alerts_scenes.scene_id');
				})
				.where('alerts.is_expired', false)
				.groupBy(['user_id', 'alerts_scenes.scene_id', 'is_only']),
		);
	});
};

exports.down = async function(knex) {
	await knex.schema.dropMaterializedView('alerts_users_scenes');

	await knex.schema.alterTable('alerts', (table) => {
		table.dropColumn('is_expired');
	});

	await knex.schema.alterTable('notifications', (table) => {
		table.dropColumn('seen_at');
	});
};