from datetime import datetime
try:
    # Python 2.x
    import httplib
except:
    import http.client as httplib
import logging
import random
import re
import socket
import sys
import time
import traceback
try:
    # Python 2.x
    import urlparse
except:
    import urllib.parse as urlparse
try: import json
except ImportError:
    try: import simplejson as json
    # it's possible that we may not need json for the action that we're taking.
    # for example, for the rpm post install script, on a python version that
    # doesn't have json, we'll get this far in the code.  but the post
    # install doesn't use json, so we're fine
    except ImportError: json = None
try:
    # trying to import SSL to make sure we can use unverified SSLs if possible
    # otherwise we'll set this and later keep from using the wrong connection settings
    import ssl
except:
    ssl = None

class Client(object):
    '''
    This is a client used for communicating with an aggregator, either *the*
    Aggregator or an Onsight instance.
    '''

    def __init__(self, agg_url, version, server_key=None, customer_key=None):
        self.log = logging.getLogger(self.__class__.__name__)
        self.customer_key = customer_key
        self.server_key = server_key
        self.agg_url = agg_url
        self.version = version

    def call(self, action, data={}, method="POST"):
        agg_urls = [url.strip() for url in self.agg_url.split(",") if url.strip()]
        random.shuffle(agg_urls)

        error = None
        for agg_url in agg_urls:
            try:
                url_parts = urlparse.urlparse(agg_url)
                if url_parts[0] == "" or url_parts[1] == "":
                    url_parts = urlparse.urlparse("http://" + agg_url)
                if url_parts[0] not in ('http', 'https') or \
                   url_parts[1] == "":
                    raise Exception("Invalid aggregator URL")
            except:
                raise ValueError("Invalid aggregator URL format.")
            agg_url = url_parts[1]

            if ':' in agg_url:
                url, port = agg_url.split(":")
                port = int(port or 443)
            else:
                url = agg_url
                port = 443
            if "/v" in agg_url:
                url = url[:url.index("/v")]
            self.log.info("aggregator call %r to %r:%d", action, url, port)

            data['agent_version'] = self.version
            data['metadata_version'] = 'v3'
            data['agent_time'] = time.mktime(datetime.now().timetuple())
            self.log.debug('Data: %r' % data)

            uri = "/v%s/%s" % (self.version, action)
            if method == "POST":
                params = json.dumps(data)
            else:
                if sys.version[0] == '3':
                    params = urllib.parse.urlencode(data)
                else:
                    params = urllib.urlencode(data)
            headers = {
                "Content-type": "application/json",
                "Accept": "application/json",
                "Authorization": self.server_key or ''
            }

            if port in (443, 8443):
                # XXX Below is a workaround for later versions of Python changing how self-signed
                # certs are handled.


                # Special logic because HPUX is made by satan and has diverging ssl and socket library versions
                # that cause issues trying to get the syncs to work properly with the agent
                if 'hp-ux' in sys.platform:
                    connection = httplib.HTTPSConnection(url, port, context=ssl._create_unverified_context())
                else:
                    self.log.debug(sys.version_info)
                    if ssl and hasattr(ssl, '_create_unverified_context'):
                        self.log.debug('ssl has _create_unverified_context attribute: %s', hasattr(ssl, '_create_unverified_context'))
                        connection = httplib.HTTPSConnection(url, port, timeout=25, context=ssl._create_unverified_context())
                    elif sys.version_info >= (2, 6, 0):
                        connection = httplib.HTTPSConnection(url, port, timeout=25)
                    else:
                        connection = httplib.HTTPSConnection(url, port)

            else:
                if sys.version_info >= (2, 6, 0) and 'hp-ux' not in sys.platform:
                    connection = httplib.HTTPConnection(url, port, timeout=25)
                else:
                    connection = httplib.HTTPConnection(url, port)


            try:
                self.log.debug("%s - %s - %s - %s" % (method, uri, params, headers))
                connection.request(method, uri, params, headers)
                resp = connection.getresponse()
                if method == "POST" and int(resp.status) != 201:
                    raise Exception(resp.reason)
                elif method != "POST" and int(resp.status) != 200:
                    raise Exception(resp.reason)
                return json.loads(resp.read().decode('utf-8'))
            except Exception:
                err = sys.exc_info()[1]
                error = str(err)
                self.log.error('Unable to connect: %s' % error)
                continue

        raise Exception(error)

    def get_local_ip(self):
        self.log.info('Creating connection to %s', self.agg_url)
        client = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
        if ':' in self.agg_url.split(',')[0]:
            host, port = self.agg_url.split(',')[0].split(':')
        else:
            host = self.agg_url
            port = 0
        client.connect((host, int(port)))

        return client.getsockname()[0]

    def sync(
        self,
        results,
        outage_events,
        metadata,
        countermeasures_metadata,
        facts,
        discovered_containers,
        deleted_containers,
        register,
        register_custom_metrics,
        incidents,
        config,
        ips,
        auto_topo_scans,
        force_send_schedules=False,
        command_results={}
    ):
        payload = dict(
            results=results,
            outage_events=outage_events,
            metadata=metadata,
            countermeasures_metadata=countermeasures_metadata,
            facts=facts,
            discovered_containers=discovered_containers,
            deleted_containers=deleted_containers,
            force_send_schedules=force_send_schedules,
            command_results=command_results,
            register=register,
            register_custom_metrics=register_custom_metrics,
            incidents=incidents,
            config=config,
            ips=ips,
            auto_topo_scans=auto_topo_scans,
        )
        return self.call("sync", payload)

    def notify_of_uninstall(self, remove_instance=False):
        success = False
        self.log.info("beginning uninstall notification")

        try:
            self.call("uninstall", data={'remove_instance': remove_instance})
        except:
            self.log.error("error connecting")
        else:
            self.log.info("notified successfully")
            success = True

        return success

    def handshake(self, ips, properties, attributes=None):
        self.log.info('Beginning handshake')

        hostname = socket.getfqdn()

        data = {
            'customer_key': self.customer_key,
            'hostname': hostname,
            'ips': ips,
        }

        data.update(properties)
        data.update(self.parse_attributes(attributes, properties))

        self.log.info('Handshaking with aggregator')
        self.log.debug('Handshake data: %r' % data)

        server_key = None
        found_server = False
        success = False
        error = None
        log_level = None
        try:
            data = self.call('handshake', data)
            self.log.debug(data)
            server_key = data['server_key']
            found_server = data['found_server']
            if 'commands' in data and 'log_level' in data['commands']:
                log_level = data['commands']['log_level']
        except Exception:
            err = sys.exc_info()[1]
            self.log.error('Error connecting: %s' % err)
            error = err
        else:
            success = True
            self.log.info('Connected successfully! Received server key: %r',
                          server_key)
        if not (data.get('server_key') or data.get('found_server')):
            error = 'Error performing handshake with the aggregator, please check connectivity'
            success = False

        if 'error' in data and data.get('error'):
            success = False
            if data['error'] == 'invalid_credentials':
                error = 'Incorrect username/password'
            elif data['error'] == 'invalid_customer_key':
                error = 'Unknown/invalid customer key'
            elif data['error'] == 'invalid_server_group':
                error = 'Unknown server group'
            elif data['error'] == 'inactive_customer':
                error = 'Customer inactive'
            elif data['error'] == 'no_user_found_for_customer':
                error = 'No active user found for the customer'
            elif data['error'].startswith('invalid_template_id'):
                error = 'Unknown template id %s' % data['error'].replace('invalid_template_id:', '')
            else:
                error = data['error']

        self.log.info('Success: %s, server key: %s, found server: %s, error: %s',
                      success,
                      server_key,
                      found_server,
                      error)

        return success, server_key, found_server, error, log_level

    def maintenance(self, duration, metric_tags=None):
        """
        Request to the aggregator that it starts a maintenance for our server.
        It requires the duration of the maintenance in minutes, and
        accepts an optional list of tags to mark metrics that are going to be affected
        by it.
        """
        payload = {
            'duration': duration,
            'metric_tags': metric_tags and metric_tags or []
        }
        return self.call('maintenance', payload)

    def end_maintenance(self):
        """
        Request to the aggregator that it ends all active maintenances for our server.
        POST call with no parameters.
        """
        return self.call('end_maintenance')

    def parse_attributes(self, attributes, properties):
        """
        Receive a dictionary containing the attributes stored in the manifest file.
        Parse them accordingly and store them in an attribute dictionary. Attributes get parsed
        only if the customer key is present in the properties.
        """
        if 'customer_key' in properties:
            return attributes and {'attributes': attributes} or {}
        else:
            return {}