# Copyright (c) 2022 PaddlePaddle Authors. 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.

from paddle.distributed.launch import plugins

from .node import Node
from .status import Status
from .args_envs import parse_args, fetch_envs, env_args_mapping

import logging


class Context(object):
    def __init__(self, enable_plugin=True):
        self.args, self.unknown_args = parse_args()
        self.envs = fetch_envs()
        self.logger = self.get_logger()

        self.node = Node()
        self.status = Status()

        self.set_env_in_args()

        # design for event queue, later
        self.events = []

        if enable_plugin:
            self._enable_plugin()

    def is_legacy_mode(self):
        if self.args.legacy:
            return True

        if len(self.unknown_args) > 0:
            self.logger.warning("Compatible mode enable with args {}".format(
                self.unknown_args))
            return True

        legacy_env_list = [
            'DISTRIBUTED_TRAINER_ENDPOINTS',
            'PADDLE_ELASTIC_JOB_ID',
            'PADDLE_DISTRI_BACKEND',
            'FLAGS_START_PORT',
        ]

        for env in legacy_env_list:
            if env in self.envs:
                self.logger.warning(
                    "ENV {} is deprecated, legacy launch enable".format(env))
                return True

        if self.args.master:
            return False

        return False

    def get_envs(self):
        return self.envs.copy()

    def _enable_plugin(self):
        for pl in plugins.enabled_plugins:
            pl(self)

    def get_logger(self, level=logging.INFO):
        logger = logging.getLogger("LAUNCH")
        logger.setLevel(self.args.log_level.upper() or level)
        formatter = logging.Formatter(
            fmt='%(name)s %(levelname)s %(asctime)s %(message)s')
        ch = logging.StreamHandler()
        ch.setFormatter(formatter)
        logger.addHandler(ch)
        return logger

    def continous_log(self) -> bool:
        if self.args.log_level.upper() in ['DEBUG', 'ERROR']:
            return True
        else:
            return False

    def set_env_in_args(self):
        for k, v in env_args_mapping.items():
            if k in self.envs:
                setattr(self.args, v, self.envs[k])