import 'remote_asset.entity.dart';
import 'local_asset.entity.dart';

-- TRIGGERS ON local_asset_entity

-- Find and update the remote_id in local_asset_entity and local_id in remote_asset_entity when checksum is set
CREATE TRIGGER IF NOT EXISTS tr_local_asset_update_checksum_set_ids
AFTER UPDATE OF checksum ON local_asset_entity
FOR EACH ROW
WHEN NEW.checksum IS NOT NULL
BEGIN
    UPDATE local_asset_entity
    SET remote_id = (SELECT id FROM remote_asset_entity WHERE checksum = NEW.checksum LIMIT 1)
    WHERE id = NEW.id;

    UPDATE remote_asset_entity
    SET local_id = (SELECT id FROM local_asset_entity WHERE checksum = NEW.checksum ORDER BY id ASC LIMIT 1)
    WHERE checksum = NEW.checksum;
END;

-- When a local asset is updated, relink remote assets that had a checksum match
CREATE TRIGGER IF NOT EXISTS tr_local_asset_update_old_checksum_set_remote_asset_local_id
AFTER UPDATE OF checksum ON local_asset_entity
FOR EACH ROW
WHEN OLD.checksum IS NOT NULL
BEGIN
    UPDATE remote_asset_entity
    SET local_id = (SELECT id FROM local_asset_entity WHERE checksum = OLD.checksum ORDER BY id ASC LIMIT 1)
    WHERE checksum = OLD.checksum;
END;

-- remote_asset_entity.checksum is a 1..* relationship with local_asset_entity.checksum.
-- When a local asset is deleted, update remote assets that had a checksum match
-- to ensure their local_id is set to the first matching local asset or NULL
CREATE TRIGGER IF NOT EXISTS tr_local_asset_delete_update_remote_asset_local_id
AFTER DELETE ON local_asset_entity
FOR EACH ROW
WHEN OLD.checksum IS NOT NULL
BEGIN
    UPDATE remote_asset_entity
    SET local_id = (SELECT id FROM local_asset_entity WHERE checksum = OLD.checksum ORDER BY id ASC LIMIT 1)
    WHERE checksum = OLD.checksum;
END;


-- TRIGGERS ON remote_asset_entity

-- Find and update local_id in remote_asset_entity when a new remote asset is inserted
CREATE TRIGGER IF NOT EXISTS tr_remote_asset_insert_set_local_id
AFTER INSERT ON remote_asset_entity
FOR EACH ROW
BEGIN
    UPDATE remote_asset_entity
    SET local_id = (SELECT id FROM local_asset_entity WHERE checksum = NEW.checksum ORDER BY id ASC LIMIT 1)
    WHERE id = NEW.id;

    UPDATE local_asset_entity SET remote_id = NEW.id WHERE checksum = NEW.checksum;
END;