# By: Riasat Ullah
# This file contains all Sysdig service integration related views.

from data_syncers import syncer_services, syncer_task_instances
from dbqueries import db_integrations
from exceptions.user_exceptions import InvalidRequest
from integrations import sysdig
from modules.router import Router
from objects.events import ResolveEvent
from objects.task_payload import TaskPayload
from rest_framework.decorators import api_view
from rest_framework.response import Response
from translators import label_translator as _lt
from utils import constants, errors, info, key_manager, logging, times, var_names
from utils.db_connection import CACHE_CLIENT, CONN_POOL
from validations import request_validator
import configuration


@api_view(['POST'])
def process_incoming_webhook(request, integration_key, conn=None, cache=None):
    '''
    Processes the incoming webhook from Sysdig.
    :param request: Http request
    :param integration_key: integration key passed in the url
    :param conn: db connection
    :param cache: cache client
    :return: Http response
    '''
    if request.method == 'POST':
        lang = request_validator.get_user_language(request)
        try:
            conn = CONN_POOL.get_db_conn() if conn is None else conn
            cache = CACHE_CLIENT if cache is None else cache

            unmasked_integ_key = key_manager.unmask_reference_key(integration_key)
            alert_attr = request.data[sysdig.var_alert]

            alert_id = alert_attr[sysdig.var_alert_id]
            alert_title = alert_attr[sysdig.var_alert_subject]
            alert_body = alert_attr[sysdig.var_alert_body]
            alert_scope = alert_attr[sysdig.var_alert_scope]

            urgency = sysdig.severity_map[alert_attr[sysdig.var_alert_severity]]
            alert_state = request.data[sysdig.var_state]

            current_time = times.get_current_timestamp()
            integ_id, serv_id, org_id = syncer_services.get_integration_key_details(
                conn, cache, current_time, unmasked_integ_key)

            # Create a new task if this is a new alert.
            if alert_state == sysdig.active_state:
                payload = TaskPayload(
                    current_time, org_id, current_time.date(), alert_title, configuration.standard_timezone,
                    current_time.time(), text_msg=alert_body, urgency_level=urgency,
                    trigger_method=constants.integrations_api, trigger_info=request.data, integration_id=integ_id,
                    integration_key=integration_key, service_id=serv_id
                )
                Router(conn, cache, payload).start()

            # Update the status of the instance created if this is a recovery alert.
            elif alert_state == sysdig.ok_state:
                integ_insts = db_integrations.get_integration_open_instances_trigger_info(
                    conn, current_time, org_id, serv_id, integ_id)

                match_count = 0
                for inst_id, task_id, trig_info in integ_insts:
                    if trig_info is not None:
                        source_alert_attr = trig_info[var_names.source_payload][sysdig.var_alert]

                        if source_alert_attr[sysdig.var_alert_id] == alert_id and\
                                source_alert_attr[sysdig.var_alert_scope] == alert_scope:

                            match_count += 1
                            event = ResolveEvent(inst_id, current_time, constants.integrations_api)
                            syncer_task_instances.resolve(conn, cache, event, org_id, is_sys_action=True)

                if match_count == 0:
                    logging.warning(errors.err_unknown_resource)
            else:
                msg = 'Alert received from Sysdig with state - ' + alert_state + '. No action taken.'
                logging.info(msg)
            return Response(info.msg_internal_success)
        except InvalidRequest as e:
            logging.exception(str(e))
            return Response(_lt.get_label(errors.err_invalid_request, lang), status=400)
        except Exception as e:
            logging.exception(str(e))
            return Response(_lt.get_label(errors.err_system_error, lang), status=500)
        finally:
            CONN_POOL.put_db_conn(conn)