import json
import logging
from concurrent import futures
from datetime import timedelta
from threading import Event

import grpc
from flask import Flask

from app import app
from buildman.buildman_pb import buildman_pb2, buildman_pb2_grpc
from buildman.buildmanagerservicer import BuildManagerServicer
from buildman.jobutil.buildjob import BuildJob, BuildJobLoadException
from data import database, model

logger = logging.getLogger(__name__)


# Internal app grpc port
DEFAULT_GRPC_SERVER_PORT = 50051
# Port exposed by Nginx
SECURE_GRPC_SERVER_PORT = 55443

DEFAULT_GRPC_SERVER_WORKER_COUNT = 10


class BuilderServer(object):
    """
    Server which handles starting the gRPC gateway, along with initializing the build manager
    and starting its reconciliation loop.
    """

    def __init__(
        self,
        registry_hostname,
        manager_hostname,
        queue,
        build_logs,
        user_files,
        lifecycle_manager_klass,
        lifecycle_manager_config,
        instance_keys,
    ):
        self._registry_hostname = registry_hostname
        self._manager_hostname = manager_hostname
        self._queue = queue
        self._build_logs = build_logs
        self._user_files = user_files
        self._instance_keys = instance_keys
        self._lifecycle_manager = lifecycle_manager_klass(
            self._registry_hostname,
            self._manager_hostname,
            self._queue,
            self._build_logs,
            self._user_files,
            self._instance_keys,
        )
        self._lifecycle_manager_config = lifecycle_manager_config

        self._shutdown_event = Event()

    def run(self, host, controller_port):
        logger.debug("Initializing the lifecycle manager")
        self._lifecycle_manager.initialize(self._lifecycle_manager_config)

        logger.debug("Initializing the gRPC server")
        server = grpc.server(
            futures.ThreadPoolExecutor(max_workers=DEFAULT_GRPC_SERVER_WORKER_COUNT)
        )
        buildman_pb2_grpc.add_BuildManagerServicer_to_server(
            BuildManagerServicer(self._lifecycle_manager), server
        )
        server.add_insecure_port("[::]:" + str(DEFAULT_GRPC_SERVER_PORT))

        logger.debug("Starting the gRPC server...")
        server.start()

        logger.debug("Starting the build manager...")
        try:
            self._lifecycle_manager._work_checker()
        except KeyboardInterrupt:
            pass
        except Exception as e:
            logger.error("Build manager work checker exception: %s", e)
            raise

        server.stop(grace=5)