adapters

type EntityCopier interface {
	CopyEntity(ent tt.Entity) error
	CopyEntities(ents []tt.Entity) error
	Reader() Reader
	Writer() Writer
}

type EntityReader interface {
	Open() error
	Close() error
	ValidateStructure() []error
	String() string
	ReadEntities(c interface{}) error
}

type GtfsReader interface {
	gtfs.Reader
	StopTimesByTripID(...string) chan []gtfs.StopTime
	ShapesByShapeID(...string) chan []gtfs.Shape
}

type Reader interface {
	EntityReader
	GtfsReader
}

type SortableWriter interface {
	SetStandardizedSortOptions(StandardizedSortOptions)
}

type StandardizedSortOptions struct {
	ApplySort   string   // SortAsc, SortDesc, or "" (no sort).
	SortColumns []string // Optional: specific columns to sort by. If empty, defaults are used.
}

type Writer interface {
	Open() error
	Close() error
	Create() error
	Delete() error
	NewReader() (Reader, error)
	AddEntity(tt.Entity) (string, error)
	AddEntities([]tt.Entity) ([]string, error)
	String() string
}

type WriterWithExtraColumns interface {
	Writer
	WriteExtraColumns(bool)
}

type WriterWithStandardizedSort interface {
	Writer
	SortableWriter
}