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# to you under the Apache License, Version 2.0 (the
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#
#   http://www.apache.org/licenses/LICENSE-2.0
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# specific language governing permissions and limitations
# under the License.
from iceberg.transforms import Transform


class PartitionField:
    """
    PartitionField is a single element with name and unique id,
    It represents how one partition value is derived from the source column via transformation

    Attributes:
        source_id(int): The source column id of table's schema
        field_id(int): The partition field id across all the table partition specs
        transform(Transform): The transform used to produce partition values from source column
        name(str): The name of this partition field
    """

    def __init__(self, source_id: int, field_id: int, transform: Transform, name: str):
        self._source_id = source_id
        self._field_id = field_id
        self._transform = transform
        self._name = name

    @property
    def source_id(self) -> int:
        return self._source_id

    @property
    def field_id(self) -> int:
        return self._field_id

    @property
    def name(self) -> str:
        return self._name

    @property
    def transform(self) -> Transform:
        return self._transform

    def __eq__(self, other):
        return (
            self.field_id == other.field_id
            and self.source_id == other.source_id
            and self.name == other.name
            and self.transform == other.transform
        )

    def __str__(self):
        return f"{self.field_id}: {self.name}: {self.transform}({self.source_id})"

    def __repr__(self):
        return f"PartitionField(field_id={self.field_id}, name={self.name}, transform={repr(self.transform)}, source_id={self.source_id})"
