# -*- coding: utf-8 -*-

# Copyright (C) 2010-2016  RhodeCode GmbH
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU Affero General Public License, version 3
# (only), as published by the Free Software Foundation.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU Affero General Public License
# along with this program.  If not, see <http://www.gnu.org/licenses/>.
#
# This program is dual-licensed. If you wish to learn more about the
# RhodeCode Enterprise Edition, including its added features, Support services,
# and proprietary license terms, please see https://rhodecode.com/licenses/

import json
import logging.config
import os
import platform
import socket
import subprocess
import time
from urllib2 import urlopen, URLError

import configobj
import pylons
import pytest
import webob
from beaker.session import SessionObject
from paste.deploy import loadapp
from pylons.i18n.translation import _get_translator
from pylons.util import ContextObj
from Pyro4.errors import CommunicationError
from routes.util import URLGenerator

from rhodecode.lib import vcs
from rhodecode.tests.fixture import TestINI
import rhodecode


def _parse_json(value):
    return json.loads(value) if value else None


def pytest_addoption(parser):
    group = parser.getgroup('pylons')
    group.addoption(
        '--with-pylons', dest='pylons_config',
        help="Set up a Pylons environment with the specified config file.")
    group.addoption(
        '--pylons-config-override', action='store', type=_parse_json,
        default=None, dest='pylons_config_override', help=(
            "Overrides the .ini file settings. Should be specified in JSON"
            " format, e.g. '{\"section\": {\"parameter\": \"value\", ...}}'"
        )
    )
    parser.addini(
        'pylons_config',
        "Set up a Pylons environment with the specified config file.")

    vcsgroup = parser.getgroup('vcs')
    vcsgroup.addoption(
        '--without-vcsserver', dest='with_vcsserver', action='store_false',
        help="Do not start the VCSServer in a background process.")
    vcsgroup.addoption(
        '--with-vcsserver', dest='vcsserver_config',
        help="Start the VCSServer with the specified config file.")
    vcsgroup.addoption(
        '--with-vcsserver-http', dest='vcsserver_config_http',
        help="Start the HTTP VCSServer with the specified config file.")
    vcsgroup.addoption(
        '--vcsserver-protocol', dest='vcsserver_protocol',
        help="Start the VCSServer with HTTP / Pyro4 protocol support.")
    vcsgroup.addoption(
        '--vcsserver-config-override', action='store', type=_parse_json,
        default=None, dest='vcsserver_config_override', help=(
            "Overrides the .ini file settings for the VCSServer. "
            "Should be specified in JSON "
            "format, e.g. '{\"section\": {\"parameter\": \"value\", ...}}'"
        )
    )
    vcsgroup.addoption(
        '--vcsserver-port', action='store', type=int,
        default=None, help=(
            "Allows to set the port of the vcsserver. Useful when testing "
            "against an already running server and random ports cause "
            "trouble."))
    parser.addini(
        'vcsserver_config',
        "Start the VCSServer with the specified config file.")
    parser.addini(
        'vcsserver_config_http',
        "Start the HTTP VCSServer with the specified config file.")
    parser.addini(
        'vcsserver_protocol',
        "Start the VCSServer with HTTP / Pyro4 protocol support.")


@pytest.fixture(scope='session')
def vcsserver(request, vcsserver_port, vcsserver_factory):
    """
    Session scope VCSServer.

    Tests wich need the VCSServer have to rely on this fixture in order
    to ensure it will be running.

    For specific needs, the fixture vcsserver_factory can be used. It allows to
    adjust the configuration file for the test run.

    Command line args:

    --without-vcsserver: Allows to switch this fixture off. You have to
    manually start the server.

    --vcsserver-port: Will expect the VCSServer to listen on this port.
    """

    if not request.config.getoption('with_vcsserver'):
        return None

    use_http = _use_vcs_http_server(request.config)
    return vcsserver_factory(
        request, use_http=use_http, vcsserver_port=vcsserver_port)


@pytest.fixture(scope='session')
def vcsserver_factory(tmpdir_factory):
    """
    Use this if you need a running vcsserver with a special configuration.
    """

    def factory(request, use_http=False, overrides=(), vcsserver_port=None):

        if vcsserver_port is None:
            vcsserver_port = get_available_port()

        overrides = list(overrides)
        if use_http:
            overrides.append({'server:main': {'port': vcsserver_port}})
        else:
            overrides.append({'DEFAULT': {'port': vcsserver_port}})

        if is_cygwin():
            platform_override = {'DEFAULT': {
                'beaker.cache.repo_object.type': 'nocache'}}
            overrides.append(platform_override)

        option_name = (
            'vcsserver_config_http' if use_http else 'vcsserver_config')
        override_option_name = 'vcsserver_config_override'
        config_file = get_config(
            request.config, option_name=option_name,
            override_option_name=override_option_name, overrides=overrides,
            basetemp=tmpdir_factory.getbasetemp().strpath,
            prefix='test_vcs_')

        print "Using the VCSServer configuration", config_file
        ServerClass = HttpVCSServer if use_http else Pyro4VCSServer
        server = ServerClass(config_file)
        server.start()

        @request.addfinalizer
        def cleanup():
            server.shutdown()

        server.wait_until_ready()
        return server

    return factory


def is_cygwin():
    return 'cygwin' in platform.system().lower()


def _use_vcs_http_server(config):
    protocol_option = 'vcsserver_protocol'
    protocol = (
        config.getoption(protocol_option) or
        config.getini(protocol_option) or
        'pyro4')
    return protocol == 'http'


class VCSServer(object):
    """
    Represents a running VCSServer instance.
    """

    _args = []

    def start(self):
        print("Starting the VCSServer: {}".format(self._args))
        self.process = subprocess.Popen(self._args)

    def wait_until_ready(self, timeout=30):
        raise NotImplementedError()

    def shutdown(self):
        self.process.kill()


class Pyro4VCSServer(VCSServer):
    def __init__(self, config_file):
        """
        :param config_file: The config file to start the server with
        """

        config_data = configobj.ConfigObj(config_file)
        self._config = config_data['DEFAULT']

        args = ['vcsserver', '--config', config_file]
        self._args = args

    def wait_until_ready(self, timeout=30):
        remote_server = vcs.create_vcsserver_proxy(self.server_and_port)
        start = time.time()
        with remote_server:
            while time.time() - start < timeout:
                try:
                    remote_server.ping()
                    break
                except CommunicationError:
                    time.sleep(0.2)
            else:
                pytest.exit(
                    "Starting the VCSServer failed or took more than {} "
                    "seconds.".format(timeout))

    @property
    def server_and_port(self):
        return '{host}:{port}'.format(**self._config)


class HttpVCSServer(VCSServer):
    """
    Represents a running VCSServer instance.
    """
    def __init__(self, config_file):
        config_data = configobj.ConfigObj(config_file)
        self._config = config_data['server:main']

        args = ['pserve', config_file, 'http_host=0.0.0.0']
        self._args = args

    @property
    def http_url(self):
        template = 'http://{host}:{port}/'
        return template.format(**self._config)

    def start(self):
        self.process = subprocess.Popen(self._args)

    def wait_until_ready(self, timeout=30):
        host = self._config['host']
        port = self._config['port']
        status_url = 'http://{host}:{port}/status'.format(host=host, port=port)
        start = time.time()

        while time.time() - start < timeout:
            try:
                urlopen(status_url)
                break
            except URLError:
                time.sleep(0.2)
        else:
            pytest.exit(
                "Starting the VCSServer failed or took more than {} "
                "seconds.".format(timeout))

    def shutdown(self):
        self.process.kill()


@pytest.fixture(scope='session')
def pylons_config(request, tmpdir_factory, rcserver_port, vcsserver_port):
    option_name = 'pylons_config'

    overrides = [
        {'server:main': {'port': rcserver_port}},
        {'app:main': {
            'vcs.server': 'localhost:%s' % vcsserver_port,
            # johbo: We will always start the VCSServer on our own based on the
            # fixtures of the test cases. For the test run it must always be
            # off in the INI file.
            'vcs.start_server': 'false',
        }},
    ]
    if _use_vcs_http_server(request.config):
        overrides.append({'app:main': {'vcs.server.protocol': 'http'}})

    filename = get_config(
        request.config, option_name=option_name,
        override_option_name='{}_override'.format(option_name),
        overrides=overrides,
        basetemp=tmpdir_factory.getbasetemp().strpath,
        prefix='test_rce_')
    return filename


@pytest.fixture(scope='session')
def rcserver_port(request):
    port = get_available_port()
    print 'Using rcserver port %s' % (port, )
    return port


@pytest.fixture(scope='session')
def vcsserver_port(request):
    port = request.config.getoption('--vcsserver-port')
    if port is None:
        port = get_available_port()
        print 'Using vcsserver port %s' % (port, )
    return port


def get_available_port():
    family = socket.AF_INET
    socktype = socket.SOCK_STREAM
    host = '127.0.0.1'

    mysocket = socket.socket(family, socktype)
    mysocket.bind((host, 0))
    port = mysocket.getsockname()[1]
    mysocket.close()
    del mysocket
    return port


@pytest.fixture(scope='session')
def available_port_factory():
    """
    Returns a callable which returns free port numbers.
    """
    return get_available_port


@pytest.fixture
def available_port(available_port_factory):
    """
    Gives you one free port for the current test.

    Uses "available_port_factory" to retrieve the port.
    """
    return available_port_factory()


@pytest.fixture(scope='session')
def pylonsapp(pylons_config, vcsserver, http_environ_session):
    logging.config.fileConfig(
        pylons_config, disable_existing_loggers=False)
    app = _setup_pylons_environment(pylons_config, http_environ_session)
    return app


@pytest.fixture(scope='session')
def testini_factory(tmpdir_factory, pylons_config):
    """
    Factory to create an INI file based on TestINI.

    It will make sure to place the INI file in the correct directory.
    """
    basetemp = tmpdir_factory.getbasetemp().strpath
    return TestIniFactory(basetemp, pylons_config)


class TestIniFactory(object):

    def __init__(self, basetemp, template_ini):
        self._basetemp = basetemp
        self._template_ini = template_ini

    def __call__(self, ini_params, new_file_prefix='test'):
        ini_file = TestINI(
            self._template_ini, ini_params=ini_params,
            new_file_prefix=new_file_prefix, dir=self._basetemp)
        result = ini_file.create()
        return result


def get_config(
        config, option_name, override_option_name, overrides=None,
        basetemp=None, prefix='test'):
    """
    Find a configuration file and apply overrides for the given `prefix`.
    """
    config_file = (
        config.getoption(option_name) or config.getini(option_name))
    if not config_file:
        pytest.exit(
            "Configuration error, could not extract {}.".format(option_name))

    overrides = overrides or []
    config_override = config.getoption(override_option_name)
    if config_override:
        overrides.append(config_override)
    temp_ini_file = TestINI(
        config_file, ini_params=overrides, new_file_prefix=prefix,
        dir=basetemp)

    return temp_ini_file.create()


def _setup_pylons_environment(pylons_config, http_environ):
    current_path = os.getcwd()
    pylonsapp = loadapp(
        'config:' + pylons_config, relative_to=current_path)

    # Using rhodecode.CONFIG which is assigned during "load_environment".
    # The indirect approach is used, because "pylonsapp" may actually be
    # the Pyramid application.
    pylonsapp_config = rhodecode.CONFIG
    _init_stack(pylonsapp_config, environ=http_environ)

    # For compatibility add the attribute "config" which would be
    # present on the Pylons application.
    pylonsapp.config = pylonsapp_config
    return pylonsapp


def _init_stack(config=None, environ=None):
    if not config:
        config = pylons.test.pylonsapp.config
    if not environ:
        environ = {}
    pylons.url._push_object(URLGenerator(config['routes.map'], environ or {}))
    pylons.app_globals._push_object(config['pylons.app_globals'])
    pylons.config._push_object(config)
    pylons.tmpl_context._push_object(ContextObj())
    # Initialize a translator for tests that utilize i18n
    translator = _get_translator(pylons.config.get('lang'))
    pylons.translator._push_object(translator)
    pylons.session._push_object(SessionObject(environ or {}))
    pylons.request._push_object(webob.Request.blank('', environ=environ))