# Copyright 2021 cstsunfu. All rights reserved.
#
# 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.

"""schedulers"""
import importlib
import os
from dlk.utils.register import Register
from torch.optim import Optimizer
from torch.optim.lr_scheduler import LambdaLR
import math


scheduler_config_register = Register("Schedule config register.")
scheduler_register = Register("Schedule register.")


class BaseScheduler(object):
    """interface for Schedule"""

    def get_scheduler(self)->LambdaLR:
        """return the initialized scheduler

        Returns: 
            Schedule

        """
        raise NotImplementedError

    def __call__(self):
        """the same as self.get_scheduler()
        """
        return self.get_scheduler()


def import_schedulers(schedulers_dir, namespace):
    for file in os.listdir(schedulers_dir):
        path = os.path.join(schedulers_dir, file)
        if (
            not file.startswith("_")
            and not file.startswith(".")
            and (file.endswith(".py") or os.path.isdir(path))
        ):
            scheduler_name = file[: file.find(".py")] if file.endswith(".py") else file
            importlib.import_module(namespace + "." + scheduler_name)


# automatically import any Python files in the schedulers directory
schedulers_dir = os.path.dirname(__file__)
import_schedulers(schedulers_dir, "dlk.core.schedulers")

[(24, 'dlk.utils.register.Register', 'Register', False, 'from dlk.utils.register import Register\n'), (25, 'dlk.utils.register.Register', 'Register', False, 'from dlk.utils.register import Register\n'), (59, 'os.path.dirname', 'os.path.dirname', False, 'import os\n'), (47, 'os.listdir', 'os.listdir', False, 'import os\n'), (48, 'os.path.join', 'os.path.join', False, 'import os\n'), (55, 'importlib.import_module', 'importlib.import_module', False, 'import importlib\n'), (52, 'os.path.isdir', 'os.path.isdir', False, 'import os\n')]