exports.up = knex => Promise.resolve()
    .then(() => knex.raw(`
        CREATE VIEW releases_document AS
            SELECT
                releases.id,
                releases.site_id,
                to_tsvector(releases.title) ||
                to_tsvector(sites.name) ||
                to_tsvector(sites.slug) ||
                to_tsvector(replace(CAST(releases.date AS VARCHAR), '-', ' ')) ||
                to_tsvector(string_agg(actors.name, ' ')) ||
                to_tsvector(string_agg(tags.name, ' ')) as document
            FROM releases
            JOIN releases_actors AS local_actors ON local_actors.release_id = releases.id
            JOIN releases_tags AS local_tags ON local_tags.release_id = releases.id
            JOIN sites ON releases.site_id = sites.id
            JOIN actors ON local_actors.actor_id = actors.id
            JOIN tags ON local_tags.tag_id = tags.id
            GROUP BY releases.id, sites.name, sites.slug;

        COMMENT ON VIEW releases_document IS E'@foreignKey (id) references releases (id)\n@foreignKey (site_id) references sites (id)';

        CREATE FUNCTION search_releases(query text) RETURNS SETOF releases_document AS $$
            SELECT * FROM releases_document AS search
            WHERE search.document @@ plainto_tsquery(replace(query, '.', ' '))
            ORDER BY ts_rank(search.document, plainto_tsquery(replace(query, '.', ' '))) DESC;
        $$ LANGUAGE SQL STABLE;
    `));

exports.down = knex => Promise.resolve()
    .then(() => knex.raw(`
        DROP FUNCTION IF EXISTS search_releases;
        DROP VIEW IF EXISTS releases_document;
    `));