#! /usr/bin/env python3
# -*- coding: utf-8 -*-
#
# Copyright 2020 Alibaba Group Holding Limited.
#
# 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 logging
import os
import platform
from abc import ABCMeta
from abc import abstractmethod
from typing import List

from gscoordinator.utils import GRAPHSCOPE_HOME

logger = logging.getLogger("graphscope")


def configure_environ():
    # add `${GRAPHSCOPE_HOME}/bin` to ${PATH}
    os.environ["PATH"] += os.pathsep + os.path.join(GRAPHSCOPE_HOME, "bin")
    # OPAL_PREFIX for openmpi
    opal_prefix = None
    if os.path.isdir(os.path.join(GRAPHSCOPE_HOME, "openmpi")):
        opal_prefix = os.path.join(GRAPHSCOPE_HOME, "openmpi")
    if os.path.isdir(os.path.join("/opt", "openmpi")):
        opal_prefix = os.path.join("/opt", "openmpi")
    # Darwin is open-mpi
    if os.path.isdir(os.path.join(GRAPHSCOPE_HOME, "open-mpi")):
        opal_prefix = os.path.join(GRAPHSCOPE_HOME, "open-mpi")
    if opal_prefix is None:
        logger.info(
            "Failed to resolve the openmpi path, moving towards the system-wide one"
        )
    else:
        os.environ["OPAL_PREFIX"] = opal_prefix
        if platform.system() == "Darwin":
            # requires on macOS, but break Kubernetes tests on Linux
            os.environ["OPAL_BINDIR"] = os.path.join(opal_prefix, "bin")
            os.environ["OPAL_LIBDIR"] = os.path.join(opal_prefix, "lib")
            os.environ["OPAL_DATADIR"] = os.path.join(opal_prefix, "share")
            os.environ["OMPI_MCA_mca_base_component_path"] = os.path.join(
                opal_prefix, "lib", "openmpi"
            )
    # add '${GRAPHSCOPE_HOME}/lib' to ${LD_LIBRARY_PATH} to find libvineyard_internal_registry.so(dylib)
    if "LD_LIBRARY_PATH" in os.environ:
        os.environ["LD_LIBRARY_PATH"] = (
            os.path.join(GRAPHSCOPE_HOME, "lib")
            + os.pathsep
            + os.environ["LD_LIBRARY_PATH"]
        )
    else:
        os.environ["LD_LIBRARY_PATH"] = os.path.join(GRAPHSCOPE_HOME, "lib")
    if "DYLD_LIBRARY_PATH" in os.environ:
        os.environ["DYLD_LIBRARY_PATH"] = (
            os.path.join(GRAPHSCOPE_HOME, "lib")
            + os.pathsep
            + os.environ["DYLD_LIBRARY_PATH"]
        )
    else:
        os.environ["DYLD_LIBRARY_PATH"] = os.path.join(GRAPHSCOPE_HOME, "lib")


class AbstractLauncher(metaclass=ABCMeta):
    def __init__(self):
        self._instance_id: str = None
        self._num_workers: int = None
        self._hosts: List[str] = []
        self._analytical_engine_endpoint: str = None
        self._vineyard_endpoint: str = None
        self._vineyard_socket: str = None
        self._session_workspace: str = None
        configure_environ()

    @abstractmethod
    def create_analytical_instance(self):
        pass

    @abstractmethod
    def create_interactive_instance(
        self, object_id: int, schema_path: str, params: dict, with_cypher: bool
    ):
        pass

    @abstractmethod
    def create_learning_instance(
        self, object_id: int, handle: str, config: str, learning_backend: int
    ):
        pass

    @abstractmethod
    def close_analytical_instance(self):
        pass

    @abstractmethod
    def close_interactive_instance(self, object_id: int):
        pass

    @abstractmethod
    def close_learning_instance(self, object_id: int, learning_backend: int):
        pass

    @abstractmethod
    def launch_etcd(self):
        pass

    @abstractmethod
    def launch_vineyard(self):
        pass

    @abstractmethod
    def close_etcd(self):
        pass

    @abstractmethod
    def close_vineyard(self):
        pass

    @abstractmethod
    def configure_etcd_endpoint(self):
        pass

    @abstractmethod
    def get_engine_config(self) -> dict:
        pass

    @abstractmethod
    def get_vineyard_stream_info(self):
        pass

    @abstractmethod
    def distribute_file(self, path):
        pass

    @property
    def vineyard_endpoint(self) -> str:
        return self._vineyard_endpoint

    @property
    def vineyard_socket(self) -> str:
        return self._vineyard_socket

    @property
    def analytical_engine_endpoint(self) -> str:
        return self._analytical_engine_endpoint

    @property
    def num_workers(self) -> int:
        if self._num_workers is None:
            raise RuntimeError("Get None value of workers number.")
        return int(self._num_workers)

    @property
    def instance_id(self) -> str:
        return self._instance_id

    @property
    def hosts(self) -> List[str]:
        return self._hosts

    @abstractmethod
    def type(self):
        pass

    @abstractmethod
    def start(self):
        pass

    @abstractmethod
    def stop(self, is_dangling=False):
        pass

    @abstractmethod
    def set_session_workspace(self, session_id: str):
        pass

    def get_namespace(self) -> str:
        pass