--CREATE EXTENSION pg_trgm;

CREATE TABLE books (
	id          varchar(16)  primary key,
	title       text,
	authors     text[],
	contributor text,
	publisher   text,
	description text,
	tags        text[],
	date        text,
	lang        varchar(3),
	isbn        varchar(13),
	file_size   integer,
	cover       boolean,
	active      boolean,
	upload_date timestamp,
	tsv         tsvector
);

-- Books column indexes
CREATE INDEX CONCURRENTLY books_lang_idx ON books (lang);
CREATE INDEX CONCURRENTLY books_isbn_idx ON books (isbn);
CREATE INDEX CONCURRENTLY books_active_idx ON books (active);

-- Books trigram indexes
CREATE INDEX CONCURRENTLY books_title_idx ON books USING GIN (title gin_trgm_ops);
CREATE INDEX CONCURRENTLY books_contributor_idx ON books USING GIN (contributor gin_trgm_ops);
CREATE INDEX CONCURRENTLY books_publisher_idx ON books USING GIN (publisher gin_trgm_ops);
CREATE FUNCTION text(text[]) RETURNS text immutable AS $$
select $1::text
$$ language sql;
CREATE INDEX CONCURRENTLY books_authors_idx ON books USING GIN (text(authors) gin_trgm_ops);
CREATE INDEX CONCURRENTLY books_tags_idx ON books USING GIN (text(tags) gin_trgm_ops);

-- Books text search index
CREATE FUNCTION books_trigger() RETURNS trigger AS $$
declare
	lang_config regconfig;
begin
	lang_config := 'simple';
	if new.lang = 'da' then
		lang_config := 'danish';
	elsif new.lang = 'nl' then
		lang_config := 'dutch';
	elsif new.lang = 'en' then
		lang_config := 'english';
	elsif new.lang = 'fi' then
		lang_config := 'finnish';
	elsif new.lang = 'fr' then
   		lang_config := 'french';
	elsif new.lang = 'de' then
		lang_config :='german';
	elsif new.lang = 'hu' then
		lang_config :='hungarian';
	elsif new.lang = 'it' then
		lang_config :='italian';
	elsif new.lang = 'no' then
		lang_config :='norwegian';
	elsif new.lang = 'pt' then
		lang_config :='portuguese';
	elsif new.lang = 'ro' then
		lang_config :='romanian';
	elsif new.lang = 'ru' then
		lang_config :='russian';
	elsif new.lang = 'es' then
		lang_config :='spanish';
	elsif new.lang = 'sv' then
		lang_config :='swedish';
	elsif new.lang = 'tr' then
		lang_config :='turkish';
	end if;

	new.tsv :=
		setweight(to_tsvector(lang_config, coalesce(new.title,'')), 'A') ||
		setweight(to_tsvector('simple', coalesce(array_to_string(new.authors, ' '),'')), 'A') ||
		setweight(to_tsvector('simple', coalesce(new.contributor,'')), 'B') ||
		setweight(to_tsvector('simple', coalesce(new.publisher,'')), 'B') ||
		setweight(to_tsvector(lang_config, coalesce(array_to_string(new.tags, ' '),'')), 'C') ||
		setweight(to_tsvector(lang_config, coalesce(new.description,'')), 'D');
	return new;
end
$$ LANGUAGE plpgsql;
CREATE TRIGGER tsvectorupdate BEFORE INSERT OR UPDATE
    ON books FOR EACH ROW EXECUTE PROCEDURE books_trigger();
CREATE INDEX CONCURRENTLY books_idx ON books USING GIN (tsv);
CREATE FUNCTION to_tsquery_multilingual(text) RETURNS tsquery AS $$
SELECT
	to_tsquery('simple', $1) ||
	to_tsquery('danish', $1) ||
	to_tsquery('dutch', $1) ||
	to_tsquery('english', $1) ||
	to_tsquery('finnish', $1) ||
	to_tsquery('french', $1) ||
	to_tsquery('german', $1) ||
	to_tsquery('hungarian', $1) ||
	to_tsquery('italian', $1) ||
	to_tsquery('norwegian', $1) ||
	to_tsquery('portuguese', $1) ||
	to_tsquery('romanian', $1) ||
	to_tsquery('russian', $1) ||
	to_tsquery('spanish', $1) ||
	to_tsquery('swedish', $1) ||
	to_tsquery('turkish', $1)
$$ LANGUAGE sql IMMUTABLE;


CREATE TABLE news (
	id   serial unique,
	date timestamp,
	text text
);


CREATE TABLE users (
	id       serial unique,
	username varchar(255) unique,
	password bytea,
	salt     bytea,
	role     varchar(255)
);


CREATE TABLE visits (
	id        serial unique,
	downloads integer,
	views     integer,
	book_id   varchar(16) unique REFERENCES books(id) ON DELETE CASCADE
);
CREATE INDEX CONCURRENTLY visits_downloads_idx on visits(downloads DESC NULLS LAST);
CREATE INDEX CONCURRENTLY visits_views_idx on visits(views DESC NULLS LAST);


CREATE TABLE submissions (
	id        serial unique,
	submission_id varchar(16),
	filename  text,
	status    text,
	book_id   varchar(16) unique REFERENCES books(id) ON DELETE SET NULL
);
CREATE INDEX CONCURRENTLY submissions_id_idx on submissions(submission_id);
CREATE INDEX CONCURRENTLY submissions_book_idx on submissions(book_id);