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# to you under the Apache License, Version 2.0 (the
# "License"); you may not use this file except in compliance
# with the License.  You may obtain a copy of the License at
#
#   http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing,
# software distributed under the License is distributed on an
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# KIND, either express or implied.  See the License for the
# specific language governing permissions and limitations
# under the License.

from abc import ABC, abstractmethod
from typing import Any, Optional

from pypaimon.table.row.row_kind import RowKind


class InternalRow(ABC):
    """
    Base interface for an internal data structure representing data of RowType.
    """

    @abstractmethod
    def get_field(self, pos: int) -> Any:
        """
        Returns the value at the given position.
        """

    @abstractmethod
    def get_row_kind(self) -> RowKind:
        """
        Returns the kind of change that this row describes in a changelog.
        """

    @abstractmethod
    def __len__(self) -> int:
        """
        Returns the number of fields in this row.
        The number does not include RowKind. It is kept separately.
        """

    @abstractmethod
    def get_blob(self, pos: int) -> Optional[Any]:
        """Returns the Blob at the given position, or None if null."""

    @abstractmethod
    def get_vector(self, pos: int) -> Optional[Any]:
        """Returns the Vector at the given position, or None if null."""

    def __str__(self) -> str:
        fields = []
        for pos in range(self.__len__()):
            value = self.get_field(pos)
            fields.append(str(value))
        return " ".join(fields)
