BEGIN;

SELECT evergreen.upgrade_deps_block_check('0897', :eg_version);

CREATE OR REPLACE FUNCTION authority.indexing_ingest_or_delete() RETURNS TRIGGER AS $BODY$
DECLARE
    ashs    authority.simple_heading%ROWTYPE;
    mbe_row metabib.browse_entry%ROWTYPE;
    mbe_id  BIGINT;
    ash_id  BIGINT;
BEGIN

    IF NEW.deleted IS TRUE THEN -- If this authority is deleted
        DELETE FROM authority.bib_linking WHERE authority = NEW.id; -- Avoid updating fields in bibs that are no longer visible
        DELETE FROM authority.full_rec WHERE record = NEW.id; -- Avoid validating fields against deleted authority records
        DELETE FROM authority.simple_heading WHERE record = NEW.id;
          -- Should remove matching $0 from controlled fields at the same time?

        -- XXX What do we about the actual linking subfields present in
        -- authority records that target this one when this happens?
        DELETE FROM authority.authority_linking
            WHERE source = NEW.id OR target = NEW.id;

        RETURN NEW; -- and we're done
    END IF;

    IF TG_OP = 'UPDATE' THEN -- re-ingest?
        PERFORM * FROM config.internal_flag WHERE name = 'ingest.reingest.force_on_same_marc' AND enabled;

        IF NOT FOUND AND OLD.marc = NEW.marc THEN -- don't do anything if the MARC didn't change
            RETURN NEW;
        END IF;

        -- Unless there's a setting stopping us, propagate these updates to any linked bib records
        PERFORM * FROM config.internal_flag WHERE name = 'ingest.disable_authority_auto_update' AND enabled;

        IF NOT FOUND THEN
            PERFORM authority.propagate_changes(NEW.id);
        END IF;

        DELETE FROM authority.simple_heading WHERE record = NEW.id;
        DELETE FROM authority.authority_linking WHERE source = NEW.id;
    END IF;

    INSERT INTO authority.authority_linking (source, target, field)
        SELECT source, target, field FROM authority.calculate_authority_linking(
            NEW.id, NEW.control_set, NEW.marc::XML
        );

    FOR ashs IN SELECT * FROM authority.simple_heading_set(NEW.marc) LOOP

        INSERT INTO authority.simple_heading (record,atag,value,sort_value)
            VALUES (ashs.record, ashs.atag, ashs.value, ashs.sort_value);
        ash_id := CURRVAL('authority.simple_heading_id_seq'::REGCLASS);

        SELECT INTO mbe_row * FROM metabib.browse_entry
            WHERE value = ashs.value AND sort_value = ashs.sort_value;

        IF FOUND THEN
            mbe_id := mbe_row.id;
        ELSE
            INSERT INTO metabib.browse_entry
                ( value, sort_value ) VALUES
                ( ashs.value, ashs.sort_value );

            mbe_id := CURRVAL('metabib.browse_entry_id_seq'::REGCLASS);
        END IF;

        INSERT INTO metabib.browse_entry_simple_heading_map (entry,simple_heading) VALUES (mbe_id,ash_id);

    END LOOP;

    -- Flatten and insert the afr data
    PERFORM * FROM config.internal_flag WHERE name = 'ingest.disable_authority_full_rec' AND enabled;
    IF NOT FOUND THEN
        PERFORM authority.reingest_authority_full_rec(NEW.id);
        PERFORM * FROM config.internal_flag WHERE name = 'ingest.disable_authority_rec_descriptor' AND enabled;
        IF NOT FOUND THEN
            PERFORM authority.reingest_authority_rec_descriptor(NEW.id);
        END IF;
    END IF;

    RETURN NEW;
END;
$BODY$ LANGUAGE plpgsql;

COMMIT;

