-- Fix project_summary view.
--
-- New schema version: 0.3.2
--
-- ATTENTION:
--
-- ENSURE YOU HAVE BACKED UP THE DATABASE BEFORE RUNNING THIS SCRIPT.
--
--
-- NOTE: This upgrade affects all schemas in the database.
-- NOTE: Each application starts a transaction, which must be committed
-- or rolled back.
--
-- This fixes a problem with the project_summary view. In its common table
-- expression, the view definition tried to search public.projects based on
-- the search path value with the following expression:
--
-- (current_setting('search_path'::text) ~~ (p.schema || '%'::text))
--
-- That is of course bound to fail as soon as the schema goes above `survey_9`
-- because `survey_10 LIKE ('survey_1' || '%')` is TRUE.
--
-- The new mechanism relies on splitting the search_path.
--
-- NOTE: The survey schema needs to be the leftmost element in search_path.
--
-- To apply, run as the dougal user:
--
-- psql <<EOF
-- \i $THIS_FILE
-- COMMIT;
-- EOF
--
-- NOTE: It can be applied multiple times without ill effect.
--

BEGIN;

CREATE OR REPLACE PROCEDURE show_notice (notice text) AS $$
BEGIN
	RAISE NOTICE '%', notice;
END;
$$ LANGUAGE plpgsql;

CREATE OR REPLACE PROCEDURE pg_temp.upgrade_survey_schema (schema_name text) AS $$
BEGIN

	RAISE NOTICE 'Updating schema %', schema_name;
	-- We need to set the search path because some of the trigger
	-- functions reference other tables in survey schemas assuming
	-- they are in the search path.
	EXECUTE format('SET search_path TO %I,public', schema_name);

	CREATE OR REPLACE VIEW project_summary AS
	WITH fls AS (
			SELECT avg((final_lines_summary.duration / ((final_lines_summary.num_points - 1))::double precision)) AS shooting_rate,
				avg((final_lines_summary.length / date_part('epoch'::text, final_lines_summary.duration))) AS speed,
				sum(final_lines_summary.duration) AS prod_duration,
				sum(final_lines_summary.length) AS prod_distance
			FROM final_lines_summary
			), project AS (
			SELECT p.pid,
				p.name,
				p.schema
			FROM public.projects p
			WHERE (split_part(current_setting('search_path'::text), ','::text, 1) = p.schema)
			)
	SELECT project.pid,
		project.name,
		project.schema,
		( SELECT count(*) AS count
			FROM preplot_lines
			WHERE (preplot_lines.class = 'V'::bpchar)) AS lines,
		ps.total,
		ps.virgin,
		ps.prime,
		ps.other,
		ps.ntba,
		ps.remaining,
		( SELECT to_json(fs.*) AS to_json
			FROM final_shots fs
			ORDER BY fs.tstamp
			LIMIT 1) AS fsp,
		( SELECT to_json(fs.*) AS to_json
			FROM final_shots fs
			ORDER BY fs.tstamp DESC
			LIMIT 1) AS lsp,
		( SELECT count(*) AS count
			FROM raw_lines rl) AS seq_raw,
		( SELECT count(*) AS count
			FROM final_lines rl) AS seq_final,
		fls.prod_duration,
		fls.prod_distance,
		fls.speed AS shooting_rate
	FROM preplot_summary ps,
		fls,
		project;


	ALTER TABLE project_summary OWNER TO postgres;

END;
$$ LANGUAGE plpgsql;

CREATE OR REPLACE PROCEDURE pg_temp.upgrade_15 () AS $$
DECLARE
	row RECORD;
BEGIN
	FOR row IN
		SELECT schema_name FROM information_schema.schemata
		WHERE schema_name LIKE 'survey_%'
		ORDER BY schema_name
	LOOP
		CALL pg_temp.upgrade_survey_schema(row.schema_name);
	END LOOP;
END;
$$ LANGUAGE plpgsql;

CALL pg_temp.upgrade_15();

CALL show_notice('Cleaning up');
DROP PROCEDURE pg_temp.upgrade_survey_schema (schema_name text);
DROP PROCEDURE pg_temp.upgrade_15 ();

CALL show_notice('Updating db_schema version');
INSERT INTO public.info VALUES ('version', '{"db_schema": "0.3.2"}')
ON CONFLICT (key) DO UPDATE
	SET value = public.info.value || '{"db_schema": "0.3.2"}' WHERE public.info.key = 'version';


CALL show_notice('All done. You may now run "COMMIT;" to persist the changes');
DROP PROCEDURE show_notice (notice text);

--
--NOTE Run `COMMIT;` now if all went well
--