# events
from enum import Enum

EVENT_CONCEPT_PRECEDENCE_MODIFIED = "evt_cp_m"
EVENT_RULE_PRECEDENCE_MODIFIED = "evt_rp_m"
EVENT_CONTEXT_DISPOSED = "evt_ctx_d"
EVENT_USER_INPUT_EVALUATED = "evt_ui_e"
EVENT_CONCEPT_CREATED = "evt_c_c"
EVENT_CONCEPT_DELETED = "evt_c_d"
EVENT_CONCEPT_ID_DELETED = "evt_c_id_d"
EVENT_RULE_CREATED = "evt_r_c"
EVENT_RULE_DELETED = "evt_r_d"
EVENT_RULE_ID_DELETED = "evt_r_id_d"
EVENT_ONTOLOGY_CREATED = "evt_o_c"
EVENT_ONTOLOGY_DELETED = "evt_o_d"

# comparison context
RULE_COMPARISON_CONTEXT = "Rule"
CONCEPT_COMPARISON_CONTEXT = "Sya"

NO_MATCH = "** No Match **"


class CustomType:

    def __init__(self, value):
        self.value = value

    def __repr__(self):
        return self.value

    def __eq__(self, other):
        return isinstance(other, CustomType) and self.value == other.value

    def __hash__(self):
        return hash(self.value)


class NotInitType(CustomType):
    def __init__(self):
        super(NotInitType, self).__init__("**NotInit**")


class NotFoundType(CustomType):
    def __init__(self):
        super(NotFoundType, self).__init__("**NotFound**")


class RemovedType(CustomType):
    def __init__(self):
        super(RemovedType, self).__init__("**Removed**")


class NoFirstTokenType(CustomType):
    def __init__(self):
        super(NoFirstTokenType, self).__init__("**NoFirstToken**")


NotInit = NotInitType()
NotFound = NotFoundType()
Removed = RemovedType()
NoFirstToken = NoFirstTokenType()


class ErrorObj:
    """
    To indicate that somehow, the underlying object is (or has) an error
    """
    pass


CURRENT_OBJ = "__obj"


class SyaAssociativity(Enum):
    Left = "left"
    Right = "right"
    No = "No"

    def __repr__(self):
        return self.value