CREATE EXTENSION slim;
CREATE EXTENSION pacs;
SELECT pacs_reset_all_measures();
 pacs_reset_all_measures 
-------------------------
 
(1 row)

-- create a measure
SELECT pacs_create_measure('A');
 pacs_create_measure 
---------------------
 
(1 row)

-- increment it 3 times
SELECT pacs_increment_measure('A');
 pacs_increment_measure 
------------------------
 
(1 row)

SELECT pacs_increment_measure('A');
 pacs_increment_measure 
------------------------
 
(1 row)

SELECT pacs_increment_measure('A');
 pacs_increment_measure 
------------------------
 
(1 row)

-- check measure value is 3
SELECT pacs_get_measure('A');
 pacs_get_measure 
------------------
                3
(1 row)

-- reset the measure
SELECT pacs_reset_measure('A');
 pacs_reset_measure 
--------------------
 
(1 row)

-- should be 0 now
SELECT pacs_get_measure('A');
 pacs_get_measure 
------------------
                0
(1 row)

-- increment again
SELECT pacs_increment_measure('A');
 pacs_increment_measure 
------------------------
 
(1 row)

-- should be 1
SELECT pacs_get_measure('A');
 pacs_get_measure 
------------------
                1
(1 row)

-- and drop the measure
SELECT pacs_drop_measure('A');
 pacs_drop_measure 
-------------------
 
(1 row)

-- get stats from pacs (empty)
-- SELECT * FROM pacs_get_stats();
-- create 2 measures
SELECT pacs_create_measure('B');
 pacs_create_measure 
---------------------
 
(1 row)

SELECT pacs_create_measure('C');
 pacs_create_measure 
---------------------
 
(1 row)

-- expect 2 measures
-- SELECT * FROM pacs_get_stats();
-- drop one
SELECT pacs_drop_measure('B');
 pacs_drop_measure 
-------------------
 
(1 row)

-- so result now is 1
-- SELECT * FROM pacs_get_stats();
--
-- SPECIAL CASES
--
-- measure A has been dropped already.
-- but it's not erroing, as expected.
SELECT pacs_drop_measure('A');
 pacs_drop_measure 
-------------------
 
(1 row)

-- trying to get value for an inexisting measure
-- should ERROR
SELECT pacs_get_measure('absent');
ERROR:  measure "absent" does not exist
HINT:  ensure the measure name is correct or $$ select create_measure('absent')$$ to create it
-- reseting an inexsting measure
-- but it's not erroing, as expected
SELECT pacs_reset_measure('absent');
 pacs_reset_measure 
--------------------
 
(1 row)

-- the measure still does not exist
-- so we have an error
SELECT pacs_get_measure('absent');
ERROR:  measure "absent" does not exist
HINT:  ensure the measure name is correct or $$ select create_measure('absent')$$ to create it
-- however increment always create the measure if it does not exists
SELECT pacs_increment_measure('absent');
 pacs_increment_measure 
------------------------
 
(1 row)

-- and now we can fetch value (should be 1)
SELECT pacs_get_measure('absent');
 pacs_get_measure 
------------------
                1
(1 row)

-- and we drop the "absent" measure (yeah, it's confusing)
SELECT pacs_drop_measure('absent');
 pacs_drop_measure 
-------------------
 
(1 row)