# Copyright 2021 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.

"""Module for lock command handler."""
from typing import Any, Dict

from gazoo_device import errors

from local_agent import logger as logger_module
from local_agent.translation_layer.command_handlers import base


logger = logger_module.get_logger()

PWRPC_LOCK_CAPABILITY = 'pw_rpc_lock'


class LockCommandHandler(base.BaseCommandHandler):
    """Lock device command handler

    Smart Home LockUnlock Trait Schema:
    https://developers.google.com/assistant/smarthome/traits/lockunlock
    """

    _GET_IS_LOCKED = 'getIsLocked'
    _SET_LOCK = 'setLock'
    _SET_UNLOCK = 'setUnlock'
    SUPPORTED_METHODS = {_GET_IS_LOCKED, _SET_LOCK, _SET_UNLOCK}

    def _get_is_locked(self, params: Dict[str, Any]) -> bool:
        """Returns if the device is locked or not.

        Returns:
            True if the device is locked, false otherwise.

        Raises:
            DeviceError: getting locked state fails.
        """
        del params  # not used
        try:
            return self.dut.pw_rpc_lock.state
        except errors.DeviceError as exc:
            logger.exception(f'Getting locked state of {self.dut.name} failed.')
            raise exc

    def _set_lock(self, params: Dict[str, Any]) -> None:
        """Locks the device.

        Raises:
            DeviceError: locking device fails.
        """
        del params  # not used
        try:
            self.dut.pw_rpc_lock.lock()
        except errors.DeviceError as exc:
            logger.exception(f'Locking {self.dut.name} failed.')
            raise exc

    def _set_unlock(self, params: Dict[str, Any]) -> None:
        """Unlocks the device.

        Raises:
            DeviceError: unlocking device on fails.
        """
        del params  # not used
        try:
            self.dut.pw_rpc_lock.unlock()
        except errors.DeviceError as exc:
            logger.exception(f'Unlocking {self.dut.name} failed.')
            raise exc