-- Sailline ancillary data
--
-- New schema version: 0.5.0
--
-- 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.
--
-- Issue #264 calls for associating sail and acquisition lines as well
-- as indicating expected acquisition direction, and other data which
-- cannot be provided via standard import formats such as SPS or P1/90.
--
-- We support this via an additional table that holds most of the required
-- data. This data can simply be inferred from regular preplots, e.g., line
-- direction can be deduced from preplot point order, and sail / source
-- line offsets can be taken from P1/90 headers or from a configuration
-- parameter. Alternatively, and in preference, the data can be provided
-- explicitly, which is what issue #264 asks for.
--
-- In principle, this makes at least some of the attributes of `preplot_lines`
-- redundant (at least `incr` and `ntba`) but we will leave them there for
-- the time being as technical debt.
--
-- 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 pg_temp.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 $outer$
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 TABLE IF NOT EXISTS preplot_saillines
	(
		sailline integer NOT NULL,
		line integer NOT NULL,
		sailline_class character(1) NOT NULL,
		line_class character(1) NOT NULL,
		incr boolean NOT NULL DEFAULT true,
		ntba boolean NOT NULL DEFAULT false,
		remarks text NOT NULL DEFAULT '',
		meta jsonb NOT NULL DEFAULT '{}'::jsonb,
		hash text NULL, -- Theoretically the info in this table could all be inferred.
		PRIMARY KEY (sailline, sailline_class, line, line_class, incr),
		CONSTRAINT fk_sailline FOREIGN KEY (sailline, sailline_class)
			REFERENCES preplot_lines (line, class)
			ON UPDATE CASCADE
			ON DELETE CASCADE,
		CONSTRAINT fk_line FOREIGN KEY (line, line_class)
			REFERENCES preplot_lines (line, class)
			ON UPDATE CASCADE
			ON DELETE CASCADE,
		CONSTRAINT fk_hash FOREIGN KEY (hash)
			REFERENCES files (hash) MATCH SIMPLE
			ON UPDATE CASCADE
			ON DELETE CASCADE,
		CHECK (sailline_class = 'V' AND sailline_class != line_class)
	);

	COMMENT ON TABLE preplot_saillines
		IS 'We explicitly associate each preplot sailline (aka vessel line) with zero or more source lines. This information can be inferred from preplot files, e.g., via a sailline offset value, or explicitly provided.';

	-- Let us copy whatever information we can from existing tables or views

	INSERT INTO preplot_saillines
		(sailline, line, sailline_class, line_class, incr, ntba, remarks, meta)
	SELECT DISTINCT
		sailline, psp.line, 'V' sailline_class, psp.class line_class, pl.incr, pl.ntba, pl.remarks, pl.meta
	FROM preplot_saillines_points psp
	INNER JOIN preplot_lines pl ON psp.sailline = pl.line AND pl.class = 'V'
	ORDER BY sailline
	ON CONFLICT DO NOTHING;

	-- We need to recreate the preplot_saillines_points view

	CREATE OR REPLACE VIEW preplot_saillines_points AS
	SELECT psl.sailline,
		psl.ntba AS sailline_ntba,
		psl.line,
		pps.point,
		pps.class,
		pps.ntba,
		pps.geometry,
		pps.meta
	FROM preplot_saillines psl
	INNER JOIN preplot_points pps
		ON psl.line = pps.line AND psl.line_class = pps.class;



END;
$outer$ LANGUAGE plpgsql;

CREATE OR REPLACE PROCEDURE pg_temp.upgrade () AS $outer$
DECLARE
	row RECORD;
	current_db_version TEXT;
BEGIN

	SELECT value->>'db_schema' INTO current_db_version FROM public.info WHERE key = 'version';

	IF current_db_version >= '0.5.0' THEN
		RAISE EXCEPTION
			USING MESSAGE='Patch already applied';
	END IF;

	IF current_db_version != '0.4.5' THEN
		RAISE EXCEPTION
			USING MESSAGE='Invalid database version: ' || current_db_version,
				HINT='Ensure all previous patches have been applied.';
	END IF;

	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;
$outer$ LANGUAGE plpgsql;

CALL pg_temp.upgrade();

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

CALL pg_temp.show_notice('Updating db_schema version');
INSERT INTO public.info VALUES ('version', '{"db_schema": "0.5.0"}')
ON CONFLICT (key) DO UPDATE
	SET value = public.info.value || '{"db_schema": "0.5.0"}' WHERE public.info.key = 'version';


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

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