BEGIN;

-- SELECT evergreen.upgrade_deps_block_check('XXXX', :eg_version);

CREATE OR REPLACE FUNCTION actor.usr_merge( src_usr INT, dest_usr INT, del_addrs BOOLEAN, del_cards BOOLEAN, deactivate_cards BOOLEAN ) RETURNS VOID AS $$
DECLARE
	suffix TEXT;
	bucket_row RECORD;
	picklist_row RECORD;
	queue_row RECORD;
	folder_row RECORD;
BEGIN

    -- Bail if src_usr equals dest_usr because the result of merging a
    -- user with itself is not what you want.
    IF src_usr = dest_usr THEN
        RETURN;
    END IF;

    -- do some initial cleanup 
    UPDATE actor.usr SET card = NULL WHERE id = src_usr;
    UPDATE actor.usr SET mailing_address = NULL WHERE id = src_usr;
    UPDATE actor.usr SET billing_address = NULL WHERE id = src_usr;

    -- actor.*
    IF del_cards THEN
        DELETE FROM actor.card where usr = src_usr;
    ELSE
        IF deactivate_cards THEN
            UPDATE actor.card SET active = 'f' WHERE usr = src_usr;
        END IF;
        UPDATE actor.card SET usr = dest_usr WHERE usr = src_usr;
    END IF;


    IF del_addrs THEN
        DELETE FROM actor.usr_address WHERE usr = src_usr;
    ELSE
        UPDATE actor.usr_address SET usr = dest_usr WHERE usr = src_usr;
    END IF;

    UPDATE actor.usr_note SET usr = dest_usr WHERE usr = src_usr;
    -- dupes are technically OK in actor.usr_standing_penalty, should manually delete them...
    UPDATE actor.usr_standing_penalty SET usr = dest_usr WHERE usr = src_usr;
    PERFORM actor.usr_merge_rows('actor.usr_org_unit_opt_in', 'usr', src_usr, dest_usr);
    PERFORM actor.usr_merge_rows('actor.usr_setting', 'usr', src_usr, dest_usr);

    -- permission.*
    PERFORM actor.usr_merge_rows('permission.usr_perm_map', 'usr', src_usr, dest_usr);
    PERFORM actor.usr_merge_rows('permission.usr_object_perm_map', 'usr', src_usr, dest_usr);
    PERFORM actor.usr_merge_rows('permission.usr_grp_map', 'usr', src_usr, dest_usr);
    PERFORM actor.usr_merge_rows('permission.usr_work_ou_map', 'usr', src_usr, dest_usr);


    -- container.*
	
	-- For each *_bucket table: transfer every bucket belonging to src_usr
	-- into the custody of dest_usr.
	--
	-- In order to avoid colliding with an existing bucket owned by
	-- the destination user, append the source user's id (in parenthesese)
	-- to the name.  If you still get a collision, add successive
	-- spaces to the name and keep trying until you succeed.
	--
	FOR bucket_row in
		SELECT id, name
		FROM   container.biblio_record_entry_bucket
		WHERE  owner = src_usr
	LOOP
		suffix := ' (' || src_usr || ')';
		LOOP
			BEGIN
				UPDATE  container.biblio_record_entry_bucket
				SET     owner = dest_usr, name = name || suffix
				WHERE   id = bucket_row.id;
			EXCEPTION WHEN unique_violation THEN
				suffix := suffix || ' ';
				CONTINUE;
			END;
			EXIT;
		END LOOP;
	END LOOP;

	FOR bucket_row in
		SELECT id, name
		FROM   container.call_number_bucket
		WHERE  owner = src_usr
	LOOP
		suffix := ' (' || src_usr || ')';
		LOOP
			BEGIN
				UPDATE  container.call_number_bucket
				SET     owner = dest_usr, name = name || suffix
				WHERE   id = bucket_row.id;
			EXCEPTION WHEN unique_violation THEN
				suffix := suffix || ' ';
				CONTINUE;
			END;
			EXIT;
		END LOOP;
	END LOOP;

	FOR bucket_row in
		SELECT id, name
		FROM   container.copy_bucket
		WHERE  owner = src_usr
	LOOP
		suffix := ' (' || src_usr || ')';
		LOOP
			BEGIN
				UPDATE  container.copy_bucket
				SET     owner = dest_usr, name = name || suffix
				WHERE   id = bucket_row.id;
			EXCEPTION WHEN unique_violation THEN
				suffix := suffix || ' ';
				CONTINUE;
			END;
			EXIT;
		END LOOP;
	END LOOP;

	FOR bucket_row in
		SELECT id, name
		FROM   container.user_bucket
		WHERE  owner = src_usr
	LOOP
		suffix := ' (' || src_usr || ')';
		LOOP
			BEGIN
				UPDATE  container.user_bucket
				SET     owner = dest_usr, name = name || suffix
				WHERE   id = bucket_row.id;
			EXCEPTION WHEN unique_violation THEN
				suffix := suffix || ' ';
				CONTINUE;
			END;
			EXIT;
		END LOOP;
	END LOOP;

	UPDATE container.user_bucket_item SET target_user = dest_usr WHERE target_user = src_usr;

    -- vandelay.*
	-- transfer queues the same way we transfer buckets (see above)
	FOR queue_row in
		SELECT id, name
		FROM   vandelay.queue
		WHERE  owner = src_usr
	LOOP
		suffix := ' (' || src_usr || ')';
		LOOP
			BEGIN
				UPDATE  vandelay.queue
				SET     owner = dest_usr, name = name || suffix
				WHERE   id = queue_row.id;
			EXCEPTION WHEN unique_violation THEN
				suffix := suffix || ' ';
				CONTINUE;
			END;
			EXIT;
		END LOOP;
	END LOOP;

    UPDATE vandelay.session_tracker SET usr = dest_usr WHERE usr = src_usr;

    -- money.*
    PERFORM actor.usr_merge_rows('money.collections_tracker', 'usr', src_usr, dest_usr);
    PERFORM actor.usr_merge_rows('money.collections_tracker', 'collector', src_usr, dest_usr);
    UPDATE money.billable_xact SET usr = dest_usr WHERE usr = src_usr;
    UPDATE money.billing SET voider = dest_usr WHERE voider = src_usr;
    UPDATE money.bnm_payment SET accepting_usr = dest_usr WHERE accepting_usr = src_usr;

    -- action.*
    UPDATE action.circulation SET usr = dest_usr WHERE usr = src_usr;
    UPDATE action.circulation SET circ_staff = dest_usr WHERE circ_staff = src_usr;
    UPDATE action.circulation SET checkin_staff = dest_usr WHERE checkin_staff = src_usr;
    UPDATE action.usr_circ_history SET usr = dest_usr WHERE usr = src_usr;

    UPDATE action.hold_request SET usr = dest_usr WHERE usr = src_usr;
    UPDATE action.hold_request SET fulfillment_staff = dest_usr WHERE fulfillment_staff = src_usr;
    UPDATE action.hold_request SET requestor = dest_usr WHERE requestor = src_usr;
    UPDATE action.hold_notification SET notify_staff = dest_usr WHERE notify_staff = src_usr;

    UPDATE action.in_house_use SET staff = dest_usr WHERE staff = src_usr;
    UPDATE action.non_cataloged_circulation SET staff = dest_usr WHERE staff = src_usr;
    UPDATE action.non_cataloged_circulation SET patron = dest_usr WHERE patron = src_usr;
    UPDATE action.non_cat_in_house_use SET staff = dest_usr WHERE staff = src_usr;
    UPDATE action.survey_response SET usr = dest_usr WHERE usr = src_usr;

    -- acq.*
    UPDATE acq.fund_allocation SET allocator = dest_usr WHERE allocator = src_usr;
	UPDATE acq.fund_transfer SET transfer_user = dest_usr WHERE transfer_user = src_usr;
    UPDATE acq.invoice SET closed_by = dest_usr WHERE closed_by = src_usr;

	-- transfer picklists the same way we transfer buckets (see above)
	FOR picklist_row in
		SELECT id, name
		FROM   acq.picklist
		WHERE  owner = src_usr
	LOOP
		suffix := ' (' || src_usr || ')';
		LOOP
			BEGIN
				UPDATE  acq.picklist
				SET     owner = dest_usr, name = name || suffix
				WHERE   id = picklist_row.id;
			EXCEPTION WHEN unique_violation THEN
				suffix := suffix || ' ';
				CONTINUE;
			END;
			EXIT;
		END LOOP;
	END LOOP;

    UPDATE acq.purchase_order SET owner = dest_usr WHERE owner = src_usr;
    UPDATE acq.po_note SET creator = dest_usr WHERE creator = src_usr;
    UPDATE acq.po_note SET editor = dest_usr WHERE editor = src_usr;
    UPDATE acq.provider_note SET creator = dest_usr WHERE creator = src_usr;
    UPDATE acq.provider_note SET editor = dest_usr WHERE editor = src_usr;
    UPDATE acq.lineitem_note SET creator = dest_usr WHERE creator = src_usr;
    UPDATE acq.lineitem_note SET editor = dest_usr WHERE editor = src_usr;
    UPDATE acq.lineitem_usr_attr_definition SET usr = dest_usr WHERE usr = src_usr;

    -- asset.*
    UPDATE asset.copy SET creator = dest_usr WHERE creator = src_usr;
    UPDATE asset.copy SET editor = dest_usr WHERE editor = src_usr;
    UPDATE asset.copy_note SET creator = dest_usr WHERE creator = src_usr;
    UPDATE asset.call_number SET creator = dest_usr WHERE creator = src_usr;
    UPDATE asset.call_number SET editor = dest_usr WHERE editor = src_usr;
    UPDATE asset.call_number_note SET creator = dest_usr WHERE creator = src_usr;

    -- serial.*
    UPDATE serial.record_entry SET creator = dest_usr WHERE creator = src_usr;
    UPDATE serial.record_entry SET editor = dest_usr WHERE editor = src_usr;

    -- reporter.*
    -- It's not uncommon to define the reporter schema in a replica 
    -- DB only, so don't assume these tables exist in the write DB.
    BEGIN
    	UPDATE reporter.template SET owner = dest_usr WHERE owner = src_usr;
    EXCEPTION WHEN undefined_table THEN
        -- do nothing
    END;
    BEGIN
    	UPDATE reporter.report SET owner = dest_usr WHERE owner = src_usr;
    EXCEPTION WHEN undefined_table THEN
        -- do nothing
    END;
    BEGIN
    	UPDATE reporter.schedule SET runner = dest_usr WHERE runner = src_usr;
    EXCEPTION WHEN undefined_table THEN
        -- do nothing
    END;
    BEGIN
		-- transfer folders the same way we transfer buckets (see above)
		FOR folder_row in
			SELECT id, name
			FROM   reporter.template_folder
			WHERE  owner = src_usr
		LOOP
			suffix := ' (' || src_usr || ')';
			LOOP
				BEGIN
					UPDATE  reporter.template_folder
					SET     owner = dest_usr, name = name || suffix
					WHERE   id = folder_row.id;
				EXCEPTION WHEN unique_violation THEN
					suffix := suffix || ' ';
					CONTINUE;
				END;
				EXIT;
			END LOOP;
		END LOOP;
    EXCEPTION WHEN undefined_table THEN
        -- do nothing
    END;
    BEGIN
		-- transfer folders the same way we transfer buckets (see above)
		FOR folder_row in
			SELECT id, name
			FROM   reporter.report_folder
			WHERE  owner = src_usr
		LOOP
			suffix := ' (' || src_usr || ')';
			LOOP
				BEGIN
					UPDATE  reporter.report_folder
					SET     owner = dest_usr, name = name || suffix
					WHERE   id = folder_row.id;
				EXCEPTION WHEN unique_violation THEN
					suffix := suffix || ' ';
					CONTINUE;
				END;
				EXIT;
			END LOOP;
		END LOOP;
    EXCEPTION WHEN undefined_table THEN
        -- do nothing
    END;
    BEGIN
		-- transfer folders the same way we transfer buckets (see above)
		FOR folder_row in
			SELECT id, name
			FROM   reporter.output_folder
			WHERE  owner = src_usr
		LOOP
			suffix := ' (' || src_usr || ')';
			LOOP
				BEGIN
					UPDATE  reporter.output_folder
					SET     owner = dest_usr, name = name || suffix
					WHERE   id = folder_row.id;
				EXCEPTION WHEN unique_violation THEN
					suffix := suffix || ' ';
					CONTINUE;
				END;
				EXIT;
			END LOOP;
		END LOOP;
    EXCEPTION WHEN undefined_table THEN
        -- do nothing
    END;

    -- propagate preferred name values from the source user to the
    -- destination user, but only when values are not being replaced.
    WITH susr AS (SELECT * FROM actor.usr WHERE id = src_usr)
    UPDATE actor.usr SET 
        pref_prefix = 
            COALESCE(pref_prefix, (SELECT pref_prefix FROM susr)),
        pref_first_given_name = 
            COALESCE(pref_first_given_name, (SELECT pref_first_given_name FROM susr)),
        pref_second_given_name = 
            COALESCE(pref_second_given_name, (SELECT pref_second_given_name FROM susr)),
        pref_family_name = 
            COALESCE(pref_family_name, (SELECT pref_family_name FROM susr)),
        pref_suffix = 
            COALESCE(pref_suffix, (SELECT pref_suffix FROM susr))
    WHERE id = dest_usr;

    -- Copy and deduplicate name keywords
    -- String -> array -> rows -> DISTINCT -> array -> string
    WITH susr AS (SELECT * FROM actor.usr WHERE id = src_usr),
         dusr AS (SELECT * FROM actor.usr WHERE id = dest_usr)
    UPDATE actor.usr SET name_keywords = (
        WITH keywords AS (
            SELECT DISTINCT UNNEST(
                REGEXP_SPLIT_TO_ARRAY(
                    COALESCE((SELECT name_keywords FROM susr), '') || ' ' ||
                    COALESCE((SELECT name_keywords FROM dusr), ''),  E'\\s+'
                )
            ) AS parts
        ) SELECT ARRAY_TO_STRING(ARRAY_AGG(kw.parts), ' ') FROM keywords kw
    ) WHERE id = dest_usr;

    -- Finally, delete the source user
    DELETE FROM actor.usr WHERE id = src_usr;

END;
$$ LANGUAGE plpgsql;

COMMIT;
