# -*- coding: utf-8 -*-
"""
    :codeauthor: Pedro Algarvio (pedro@algarvio.me)
    :copyright: Copyright 2015 by the SaltStack Team, see AUTHORS for more details.
    :license: Apache 2.0, see LICENSE for more details.


    pytestsalt.engines.pytest_engine
    ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

    Simple salt engine which will setup a socket to accept connections allowing us to know
    when a daemon is up and running
"""

# Import python libs
from __future__ import absolute_import, print_function, unicode_literals

import errno
import logging
import os
import socket
import sys

import salt.utils.asynchronous

# Import salt libs
import salt.utils.event

# Import 3rd-party libs
from salt.ext.tornado import gen, ioloop, iostream, netutil

log = logging.getLogger(__name__)

__virtualname__ = "salt_runtests"


def __virtual__():
    if __opts__["__role"] != "master":
        return False
    return "runtests_conn_check_port" in __opts__  # pylint: disable=undefined-variable


def start():
    pytest_engine = PyTestEngine(__opts__)  # pylint: disable=undefined-variable
    pytest_engine.start()


class PyTestEngine(object):
    def __init__(self, opts):
        self.opts = opts
        self.sock = None
        self.stop_sending_events_file = opts.get("pytest_stop_sending_events_file")

    def start(self):
        self.io_loop = ioloop.IOLoop()
        self.io_loop.make_current()
        self.io_loop.add_callback(self._start)
        self.io_loop.start()

    @gen.coroutine
    def _start(self):
        port = int(self.opts["runtests_conn_check_port"])
        log.info(
            "Starting Pytest Engine(role=%s, id=%s) on port %s",
            self.opts["__role"],
            self.opts["id"],
            port,
        )

        self.sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
        self.sock.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
        self.sock.setblocking(0)
        # bind the socket to localhost on the config provided port
        self.sock.bind(("localhost", port))
        # become a server socket
        self.sock.listen(5)
        with salt.utils.asynchronous.current_ioloop(self.io_loop):
            netutil.add_accept_handler(
                self.sock, self.handle_connection,
            )

        if self.opts["__role"] == "master":
            yield self.fire_master_started_event()

    def handle_connection(self, connection, address):
        log.warning(
            "Accepted connection from %s. Role: %s", address, self.opts["__role"]
        )
        # We just need to know that the daemon running the engine is alive...
        try:
            connection.shutdown(socket.SHUT_RDWR)  # pylint: disable=no-member
            connection.close()
        except socket.error as exc:
            if not sys.platform.startswith("darwin"):
                raise
            try:
                if exc.errno != errno.ENOTCONN:
                    raise
            except AttributeError:
                # This is not macOS !?
                pass

    @gen.coroutine
    def fire_master_started_event(self):
        log.info("Firing salt-%s started event...", self.opts["__role"])
        start_event_tag = "salt/{}/{}/start".format(
            self.opts["__role"], self.opts["id"]
        )
        log.info(
            "Firing salt-%s started event. Tag: %s",
            self.opts["__role"],
            start_event_tag,
        )
        load = {"id": self.opts["id"], "tag": start_event_tag, "data": {}}
        # One minute should be more than enough to fire these events every second in order
        # for pytest-salt to pickup that the master is running
        with salt.utils.event.get_master_event(
            self.opts, self.opts["sock_dir"], listen=False
        ) as event_bus:
            timeout = 30
            while True:
                if self.stop_sending_events_file and not os.path.exists(
                    self.stop_sending_events_file
                ):
                    log.info(
                        'The stop sending events file "marker" is done. Stop sending events...'
                    )
                    break
                timeout -= 1
                try:
                    event_bus.fire_event(load, start_event_tag, timeout=500)
                    if timeout <= 0:
                        break
                    yield gen.sleep(1)
                except iostream.StreamClosedError:
                    break