#! /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.
#

"""Coordinator between client and engines"""

import argparse
import base64
import logging
import os
import signal
import sys
import threading
from concurrent import futures

import connexion
import grpc
from flask_cors import CORS
from graphscope.config import Config
from graphscope.proto import coordinator_service_pb2_grpc

from gscoordinator.flex.core.client_wrapper import initialize_client_wrapper
from gscoordinator.flex.core.config import SOLUTION
from gscoordinator.flex.encoder import JSONEncoder
from gscoordinator.monitor import Monitor
from gscoordinator.utils import human_readable_to_bytes

logger = logging.getLogger("graphscope")


def config_logging(log_level):
    """Set log level basic on config.
    Args:
        log_level (str): Log level of stdout handler
    """
    logging.basicConfig(level=logging.CRITICAL)

    # `NOTSET` is special as it doesn't show log in Python
    if isinstance(log_level, str):
        log_level = getattr(logging, log_level.upper())
    if log_level == logging.NOTSET:
        log_level = logging.DEBUG

    logger = logging.getLogger("graphscope")
    logger.setLevel(log_level)

    vineyard_logger = logging.getLogger("vineyard")
    vineyard_logger.setLevel(log_level)

    stdout_handler = logging.StreamHandler(sys.stdout)
    stdout_handler.setLevel(log_level)
    stdout_handler.addFilter(lambda record: record.levelno <= logging.INFO)
    stderr_handler = logging.StreamHandler(sys.stderr)
    stderr_handler.setLevel(logging.WARNING)

    formatter = logging.Formatter(
        "%(asctime)s [%(levelname)s][%(module)s:%(lineno)d]: %(message)s"
    )
    stdout_handler.setFormatter(formatter)
    stderr_handler.setFormatter(formatter)

    logger.addHandler(stdout_handler)
    logger.addHandler(stderr_handler)

    vineyard_logger.addHandler(stdout_handler)
    vineyard_logger.addHandler(stderr_handler)


def launch_graphscope():
    args = parse_sys_args()
    if args.config:
        config = base64.b64decode(args.config).decode("utf-8", errors="ignore")
        config = Config.loads_json(config)
    elif args.config_file:
        config = Config.load(args.config_file)
    else:
        raise RuntimeError("Must specify a config or config-file")

    config_logging(config.log_level)
    logger.info("Start server with args \n%s", config.dumps_yaml())

    if config.coordinator.http_server_only:
        start_http_service(config)
    else:
        servicer = get_servicer(config)
        start_server(servicer, config)


def parse_sys_args():
    parser = argparse.ArgumentParser()
    parser.add_argument(
        "--config",
        type=str,
        help="The base64 encoded config in json format.",
    )
    parser.add_argument(
        "--config-file", type=str, help="The config file path in yaml or json format"
    )
    # parser.add_arguments(Config, dest="gs")
    return parser.parse_args()


def get_servicer(config: Config):
    """Get servicer of specified solution under FLEX architecture"""
    from gscoordinator.servicer import init_graphscope_one_service_servicer

    service_initializers = {
        "GraphScope One": init_graphscope_one_service_servicer,
    }

    initializer = service_initializers.get(config.solution)
    if initializer is None:
        raise RuntimeError(
            f"Expect {service_initializers.keys()} of solution parameter"
        )

    return initializer(config)


def start_http_service(config):
    initialize_client_wrapper(config)
    app = connexion.App(__name__, specification_dir="./flex/openapi/")
    app.app.json_encoder = JSONEncoder
    app.app.config["MAX_CONTENT_LENGTH"] = human_readable_to_bytes(
        config.coordinator.max_content_length
    )
    app.add_api(
        "openapi.yaml",
        arguments={"title": "GraphScope FLEX HTTP SERVICE API"},
        pythonic_params=True,
    )
    # support cross origin.
    CORS(app.app)
    app.run(port=config.coordinator.http_port)


def start_server(
    coordinator_service_servicer,  # :coordinator_service_pb2_grpc.CoordinatorServiceServicer,
    config: Config,
):
    # register gRPC server
    from gscoordinator.utils import GS_GRPC_MAX_MESSAGE_LENGTH

    server = grpc.server(
        futures.ThreadPoolExecutor(max(4, os.cpu_count() or 1)),
        options=[
            ("grpc.max_send_message_length", GS_GRPC_MAX_MESSAGE_LENGTH),
            ("grpc.max_receive_message_length", GS_GRPC_MAX_MESSAGE_LENGTH),
            ("grpc.max_metadata_size", GS_GRPC_MAX_MESSAGE_LENGTH),
        ],
    )
    coordinator_service_pb2_grpc.add_CoordinatorServiceServicer_to_server(
        coordinator_service_servicer, server
    )
    endpoint = f"0.0.0.0:{config.coordinator.service_port}"
    server.add_insecure_port(endpoint)

    logger.info("Coordinator server listen at %s", endpoint)

    server.start()

    # OpenApi server
    httpservice_t = threading.Thread(target=start_http_service, args=(config,))
    httpservice_t.daemon = True
    httpservice_t.start()

    if config.coordinator.monitor:
        try:
            Monitor.startServer(config.coordinator.monitor_port, "127.0.0.1")
            logger.info(
                "Coordinator monitor server listen at 127.0.0.1:%d",
                config.coordinator.monitor_port,
            )
        except Exception:  # noqa: E722, pylint: disable=broad-except
            logger.exception(
                "Failed to start monitor server on '127.0.0.1:%s'",
                config.coordinator.monitor_port,
            )

    # handle SIGTERM signal
    def terminate(signum, frame):
        server.stop(True)
        coordinator_service_servicer.cleanup()

    signal.signal(signal.SIGTERM, terminate)

    try:
        # GRPC has handled SIGINT
        server.wait_for_termination()
    except KeyboardInterrupt:
        coordinator_service_servicer.cleanup()
        server.stop(True)


if __name__ == "__main__":
    launch_graphscope()