/* Function */

CREATE OR REPLACE FUNCTION dss_check_path(dss_path varchar)
  RETURNS void AS
$BODY$
BEGIN
	--test for empty directory names
	IF dss_path LIKE '%//%' THEN
		RAISE EXCEPTION '% contains an empty directory name', dss_path;
	END IF;

	--test if last directory is empty name

	IF dss_path LIKE '%/' AND dss_path <> '/' THEN
		RAISE EXCEPTION '% ends with an empty directory name', dss_path;
	END IF;

	--TODO: Check for invalid characters, trailing spaces, etc....

	RETURN;

END;
$BODY$
  LANGUAGE 'plpgsql' VOLATILE;

/* Test Function */

CREATE OR REPLACE FUNCTION test_dss_clean_path()
	RETURNS int4 AS
$BODY$
DECLARE
	valid_paths varchar[];
	invalid_paths varchar[];
	current_index int4 = 1;
	current_path varchar;
	max_index int4;

	error_count int4 := 0;
	test_count int4 := 0;
	input varchar;
BEGIN
	valid_paths := ARRAY['/',
					'/topdir',
					'/topdir/subdir',
					'/topdir/subdir/subsubdir'];

	invalid_paths := ARRAY['',
					'//',
					'//topdir',
					'///',
					'/topdir/',
					'/topdir/subdir/',
					'/topdir/subdir/subsubdir/'];

	/* Test valid paths: should not raise an exception */

	max_index := array_upper(valid_paths, 1);
	current_index := 1;

	BEGIN
		WHILE current_index <= max_index LOOP
			current_path := valid_paths[current_index];
			PERFORM	dss_check_path(current_path);
			--exception not expected
			RAISE NOTICE 'PASS: % did not raise an exception', current_path;
			current_index := current_index + 1;
			test_count := test_count + 1;
		END LOOP;
	EXCEPTION
		WHEN OTHERS THEN
			RAISE NOTICE 'FAIL: % should not have been identified as being an invalid 
path', current_path;
			error_count := error_count + 1;
	END;

	/* Test invalid paths: should raise an exception */

	max_index := array_upper(invalid_paths, 1);
	current_index := 1;

	WHILE current_index <= max_index LOOP
		BEGIN
			current_path := invalid_paths[current_index];
			PERFORM	dss_check_path(current_path);
			RAISE NOTICE 'FAIL: % should have been identified as an invalid path', 
current_path;
			error_count := error_count + 1;
		EXCEPTION
			WHEN OTHERS THEN
				--exception expected
				RAISE NOTICE 'PASS: % did raise an exception', current_path;
		END;
		current_index := current_index + 1;
		test_count := test_count + 1;
	END LOOP;


	IF error_count = 0 THEN
		RAISE NOTICE 'SUCCESS: All % tests passed', test_count;
	ELSE
		RAISE NOTICE 'FAILURE: % out of % tests failed', error_count, test_count;
	END IF;

	RETURN error_count;
END;

$BODY$
  LANGUAGE 'plpgsql' VOLATILE;

/* Call Test Function */

SELECT test_dss_clean_path();

/* Drop Test Function */

DROP FUNCTION test_dss_clean_path();