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# Copyright 2025 Google LLC
#
# Licensed 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 "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
import dataclasses
import typing
from bigframes import dtypes
from bigframes.operations import base_ops
import bigframes.operations.type as op_typing
day_op = base_ops.create_unary_op(
name="day",
type_signature=op_typing.DATELIKE_ACCESSOR,
)
month_op = base_ops.create_unary_op(
name="month",
type_signature=op_typing.DATELIKE_ACCESSOR,
)
year_op = base_ops.create_unary_op(
name="year",
type_signature=op_typing.DATELIKE_ACCESSOR,
)
dayofweek_op = base_ops.create_unary_op(
name="dayofweek",
type_signature=op_typing.DATELIKE_ACCESSOR,
)
quarter_op = base_ops.create_unary_op(
name="quarter",
type_signature=op_typing.DATELIKE_ACCESSOR,
)
@dataclasses.dataclass(frozen=True)
class DateDiffOp(base_ops.BinaryOp):
name: typing.ClassVar[str] = "date_diff"
def output_type(self, *input_types: dtypes.ExpressionType) -> dtypes.ExpressionType:
if input_types[0] is not input_types[1]:
raise TypeError(
f"two inputs have different types. left: {input_types[0]}, right: {input_types[1]}"
)
if input_types[0] != dtypes.DATE_DTYPE:
raise TypeError("expected date input")
return dtypes.TIMEDELTA_DTYPE
date_diff_op = DateDiffOp()