from abc import ABC
from collections import defaultdict
from typing import Union, Dict, List, Tuple

from knext import rest

from knext.component.base import SPGTypeHelper, PropertyHelper, MappingTypeEnum
from knext.component.builder.base import Mapping
from knext.operator.op import LinkOp
from knext.operator.spg_record import SPGRecord


class NormalizeOp:
    pass


class SPGTypeMapping(Mapping):
    """A Process Component that mapping data to entity/event/concept type.

    Args:
        spg_type_name: The SPG type name import from SPGTypeHelper.
    Examples:
        mapping = SPGTypeMapping(
            spg_type_name=DEFAULT.App
        ).add_field("id", DEFAULT.App.id) \
            .add_field("id", DEFAULT.App.name) \
            .add_field("riskMark", DEFAULT.App.riskMark) \
            .add_field("useCert", DEFAULT.App.useCert)

    """

    spg_type_name: Union[str, SPGTypeHelper]

    mapping: Dict[str, str] = dict()

    filters: List[Tuple[str, str]] = list()

    def add_field(self, source_field: str, target_field: Union[str, PropertyHelper], link_op: LinkOp = None,
                  norm_op: NormalizeOp = None):
        """Adds a field mapping from source data to property of spg_type.

        :param source_field: The source field to be mapped.
        :param target_field: The target field to map the source field to.
        :return: self
        """
        self.mapping[target_field] = source_field
        return self

    def add_filter(self, column_name: str, column_value: str):
        """Adds data filtering rule.
        Only the column that meets `column_name=column_value` will execute the mapping.

        :param column_name: The column name to be filtered.
        :param column_value: The column value to be filtered.
        :return: self
        """
        self.filters.append((column_name, column_value))
        return self

    def to_rest(self):
        """
        Transforms `EntityMappingComponent` to REST model `MappingNodeConfig`.
        """
        assert all(
            field in self.mapping.keys()
            for field in EntityMappingComponent.ENTITY_BASE_FIELDS
        ), f"{self.__class__.__name__} must include mapping to {str(EntityMappingComponent.ENTITY_BASE_FIELDS)}"
        mapping = defaultdict(list)
        schema = {}
        subject_type = self.schema_session.get(self.spg_type_name)
        for dst_name, src_name in self.mapping.items():
            prop = subject_type.properties.get(dst_name)
            mapping[src_name].append(prop.name)
            object_type_name = prop.object_type_name

            object_type = self.schema_session.get(object_type_name)
            if (
                    hasattr(object_type, "link_operator")
                    and object_type.link_operator is not None
            ):
                schema[dst_name] = object_type.link_operator
            if (
                    hasattr(object_type, "normalize_operator")
                    and object_type.normalize_operator is not None
            ):
                schema[dst_name] = object_type.normalize_operator
        if os.environ.get("KNEXT_DEBUG"):
            for name, operator in self.debug_operators:
                schema[name] = operator

        mapping_filters = [
            rest.MappingFilter(column_name=name, column_value=value)
            for name, value in self.filters
        ]
        mapping_configs = [
            rest.MappingConfig(source=src_name, target=tgt_names)
            for src_name, tgt_names in mapping.items()
        ]
        mapping_schemas = [
            rest.MappingSchema(name, operator_config=operator_config)
            for name, operator_config in schema.items()
        ]

        config = rest.MappingNodeConfig(
            spg_name=self.spg_type_name,
            mapping_type=self.mapping_type,
            mapping_filters=mapping_filters,
            mapping_schemas=mapping_schemas,
            mapping_configs=mapping_configs,
        )
        return rest.Node(**super().to_dict(), node_config=config)

    def submit(self):
        pass


class RelationMapping(Mapping):
    """A Process Component that mapping data to relation type.

    Args:
        subject_name: The subject name import from SPGTypeHelper.
        predicate_name: The predicate name.
        object_name: The object name import from SPGTypeHelper.
    Examples:
        mapping = RelationMappingComponent(
                    subject_name=DEFAULT.App,
                    predicate_name=DEFAULT.App.useCert,
                    object_name=DEFAULT.Cert,
                ).add_field("src_id", "srcId") \
                 .add_field("dst_id", "dstId")

    """

    subject_name: Union[str, SPGTypeHelper]
    predicate_name: Union[str, PropertyHelper]
    object_name: Union[str, SPGTypeHelper]

    mapping: Dict[str, str] = dict()

    filters: List[Tuple[str, str]] = list()

    def add_field(self, source_field: str, target_field: str):
        """Adds a field mapping from source data to property of spg_type.

        :param source_field: The source field to be mapped.
        :param target_field: The target field to map the source field to.
        :return: self
        """
        self.mapping[target_field] = source_field
        return self

    def add_filter(self, column_name: str, column_value: str):
        """Adds data filtering rule.
        Only the column that meets `column_ame=column_value` will execute the mapping.

        :param column_name: The column name to be filtered.
        :param column_value: The column value to be filtered.
        :return: self
        """
        self.filters.append((column_name, column_value))
        return self

    def to_rest(self):
        """Transforms `RelationMappingComponent` to REST model `MappingNodeConfig`."""
        mapping = defaultdict(list)
        for dst_name, src_name in self.mapping.items():
            mapping[src_name].append(dst_name)

        mapping_filters = [
            rest.MappingFilter(column_name=name, column_value=value)
            for name, value in self.filters
        ]
        mapping_configs = [
            rest.MappingConfig(source=src_name, target=tgt_names)
            for src_name, tgt_names in mapping.items()
        ]
        mapping_schemas = []

        config = rest.MappingNodeConfig(
            spg_name=f"{self.subject_name}_{self.predicate_name}_{self.object_name}",
            mapping_type=MappingTypeEnum.Relation,
            mapping_filters=mapping_filters,
            mapping_schemas=mapping_schemas,
            mapping_configs=mapping_configs,
        )
        return rest.Node(**super().to_dict(), node_config=config)