-- Table creation
-- {
CREATE OR REPLACE FUNCTION cartodb.cdb_handle_create_table ()
RETURNS event_trigger SECURITY DEFINER LANGUAGE plpgsql AS $$
DECLARE
  event_info RECORD;
  rel RECORD;
  newtable REGCLASS;
BEGIN
  event_info := schema_triggers.get_relation_create_eventinfo();

  -- We're only interested in real relations
  IF (event_info.new).relkind != 'r' THEN RETURN; END IF;

  SELECT c.relname, c.relnamespace, c.relkind, n.nspname 
  FROM pg_class c
  JOIN pg_namespace n 
  ON c.relnamespace = n.oid
  WHERE c.oid = event_info.relation
  INTO rel;

  RAISE DEBUG 'Relation % of kind % created in table % namespace % (oid %)',
	 event_info.relation, rel.relkind, rel.relname, rel.nspname, rel.relnamespace;

  -- We don't want to react to alters triggered by superuser,
  IF current_setting('is_superuser') = 'on' THEN
    RAISE DEBUG 'no ddl trigger for superuser';
    RETURN;
  END IF;

  PERFORM cartodb.cdb_disable_ddl_hooks();

  -- CDB_CartodbfyTable must not create tables, or infinite loop will happen
  PERFORM cartodb.CDB_CartodbfyTable(rel.nspname, event_info.relation);

  PERFORM cartodb.cdb_enable_ddl_hooks();

  RAISE DEBUG 'Inserting into cartodb.CDB_TableMetadata';

  newtable := Format('%s.%s', rel.nspname, rel.relname)::regclass;

  -- Add entry to CDB_TableMetadata (should CartodbfyTable do this?)
  INSERT INTO cartodb.CDB_TableMetadata(tabname, updated_at) 
  VALUES (newtable, now());

END; $$;
-- }

-- Table drop
-- {
CREATE OR REPLACE FUNCTION cartodb.cdb_handle_drop_table ()
RETURNS event_trigger SECURITY DEFINER LANGUAGE plpgsql AS $$
DECLARE
  event_info RECORD;
BEGIN
  event_info := schema_triggers.get_relation_drop_eventinfo();

  -- We're only interested in real relations
  IF (event_info.old).relkind != 'r' THEN RETURN; END IF;

  RAISE DEBUG 'Relation % of kind % dropped from namespace oid %',
	 event_info.old_relation_oid, (event_info.old).relkind, (event_info.old).relnamespace;

  -- delete record from CDB_TableMetadata (should invalidate varnish)
  DELETE FROM cartodb.CDB_TableMetadata WHERE tabname = event_info.old_relation_oid;

END; $$;
-- }

-- Column alter
-- {
CREATE OR REPLACE FUNCTION cartodb.cdb_handle_alter_column ()
RETURNS event_trigger SECURITY DEFINER LANGUAGE plpgsql AS $$
DECLARE
  event_info RECORD;
  rel RECORD;
  newtable REGCLASS;
BEGIN
  event_info := schema_triggers.get_column_alter_eventinfo();

  SELECT c.relname, c.relnamespace, c.relkind, n.nspname 
  FROM pg_class c
  JOIN pg_namespace n 
  ON c.relnamespace = n.oid
  WHERE c.oid = event_info.relation
  INTO rel;

  RAISE DEBUG 'Column % altered by % (superuser? %) in relation % of kind %',
	 (event_info.old).attname, current_user, current_setting('is_superuser'), rel.relname, rel.relkind;

  -- We're only interested in real relations
  IF rel.relkind != 'r' THEN RETURN; END IF;

  -- We don't want to react to alters triggered by superuser,
  IF current_setting('is_superuser') = 'on' THEN
    RAISE DEBUG 'no ddl trigger for superuser';
    RETURN;
  END IF;

  PERFORM cartodb.cdb_disable_ddl_hooks();

  PERFORM cartodb.CDB_CartodbfyTable(rel.nspname, event_info.relation);

  PERFORM cartodb.cdb_enable_ddl_hooks();

  newtable := Format('%s.%s', rel.nspname, rel.relname)::regclass;

  -- update CDB_TableMetadata.updated_at (should invalidate varnish)
  UPDATE cartodb.CDB_TableMetadata SET updated_at = NOW(), tabname = newtable
  WHERE tabname = event_info.relation; 

END; $$;
-- }

-- Column drop
-- {
CREATE OR REPLACE FUNCTION cartodb.cdb_handle_drop_column ()
RETURNS event_trigger SECURITY DEFINER LANGUAGE plpgsql AS $$
DECLARE
  event_info RECORD;
  rel RECORD;
  newtable REGCLASS;
BEGIN
  event_info := schema_triggers.get_column_drop_eventinfo();

  SELECT c.relname, c.relnamespace, c.relkind, n.nspname 
  FROM pg_class c
  JOIN pg_namespace n 
  ON c.relnamespace = n.oid
  WHERE c.oid = event_info.relation
  INTO rel;

  RAISE DEBUG 'Column % drop by % (superuser? %) in relation % of kind %',
	 (event_info.old).attname, current_user, current_setting('is_superuser'), rel.relname, rel.relkind;

  -- We're only interested in real relations
  IF rel.relkind != 'r' THEN RETURN; END IF;

  -- We don't want to react to drops triggered by superuser,
  IF current_setting('is_superuser') = 'on' THEN
    RAISE DEBUG 'no ddl trigger for superuser';
    RETURN;
  END IF;


  PERFORM cartodb.cdb_disable_ddl_hooks();

  PERFORM cartodb.CDB_CartodbfyTable(rel.nspname, event_info.relation);

  PERFORM cartodb.cdb_enable_ddl_hooks();

  newtable := Format('%s.%s', rel.nspname, rel.relname)::regclass;

  -- update CDB_TableMetadata.updated_at (should invalidate varnish)
  UPDATE cartodb.CDB_TableMetadata SET updated_at = NOW(), tabname = newtable
  WHERE tabname = event_info.relation;

END; $$;
-- }

-- Column add
-- {
CREATE OR REPLACE FUNCTION cartodb.cdb_handle_add_column ()
RETURNS event_trigger SECURITY DEFINER LANGUAGE plpgsql AS $$
DECLARE
  event_info RECORD;
  rel RECORD;
BEGIN
  event_info := schema_triggers.get_column_add_eventinfo();

  SELECT c.relname, c.relnamespace, c.relkind, n.nspname 
  FROM pg_class c
  JOIN pg_namespace n 
  ON c.relnamespace = n.oid
  WHERE c.oid = event_info.relation
  INTO rel;

  RAISE DEBUG 'Column % added by % (superuser? %) in relation % of kind %',
	 (event_info.new).attname, current_user, current_setting('is_superuser'), rel.relname, rel.relkind;

  -- We're only interested in real relations
  IF rel.relkind != 'r' THEN RETURN; END IF;

  -- We don't want to react to drops triggered by superuser,
  IF current_setting('is_superuser') = 'on' THEN
    RAISE DEBUG 'no ddl trigger for superuser';
    RETURN;
  END IF;

  -- update CDB_TableMetadata.updated_at (should invalidate varnish)
  UPDATE cartodb.CDB_TableMetadata SET updated_at = NOW()
  WHERE tabname = event_info.relation; 

END; $$;
-- }

CREATE OR REPLACE FUNCTION cartodb.cdb_disable_ddl_hooks() returns void AS $$
 DROP EVENT TRIGGER IF EXISTS cdb_on_relation_create;
 DROP EVENT TRIGGER IF EXISTS cdb_on_relation_drop;
 DROP EVENT TRIGGER IF EXISTS cdb_on_alter_column;
 DROP EVENT TRIGGER IF EXISTS cdb_on_drop_column;
 DROP EVENT TRIGGER IF EXISTS cdb_on_add_column;
$$ LANGUAGE sql;

CREATE OR REPLACE FUNCTION cartodb.cdb_enable_ddl_hooks() returns void AS $$
 SELECT cartodb.cdb_disable_ddl_hooks();
 CREATE EVENT TRIGGER cdb_on_relation_create
    ON "relation_create" EXECUTE PROCEDURE cartodb.cdb_handle_create_table();
 CREATE EVENT TRIGGER cdb_on_relation_drop
    ON "relation_drop" EXECUTE PROCEDURE cartodb.cdb_handle_drop_table();
 CREATE EVENT TRIGGER cdb_on_alter_column
    ON "column_alter" EXECUTE PROCEDURE cartodb.cdb_handle_alter_column();
 CREATE EVENT TRIGGER cdb_on_drop_column
    ON "column_drop" EXECUTE PROCEDURE cartodb.cdb_handle_drop_column();
 CREATE EVENT TRIGGER cdb_on_add_column
    ON "column_add" EXECUTE PROCEDURE cartodb.cdb_handle_add_column();
$$ LANGUAGE sql;

-- Do not enable hooks by default
--SELECT cartodb.cdb_enable_ddl_hooks();