#!/usr/bin/env python
# -*- coding: utf-8 -*-

import sys
import json
import os
from pymisp import PyMISP
from settings import url, key, ssl, outputdir, filters, valid_attribute_distribution_levels


objectsToSave = {'Orgc': {'fields': ['name', 'uuid'],
                          'multiple': False,
                          },
                 'Tag': {'fields': ['name', 'colour', 'exportable'],
                         'multiple': True,
                         },
                 'Attribute': {'fields': ['uuid', 'value', 'category', 'type',
                                          'comment', 'data', 'timestamp', 'to_ids'],
                               'multiple': True,
                               },
                 }

fieldsToSave = ['uuid', 'info', 'threat_level_id', 'analysis',
                'timestamp', 'publish_timestamp', 'published',
                'date']

valid_attribute_distributions = []


def init():
    # If we have an old settings.py file then this variable won't exist
    global valid_attribute_distributions
    try:
        valid_attribute_distributions = valid_attribute_distribution_levels
    except:
        valid_attribute_distributions = ['0', '1', '2', '3', '4', '5']
    return PyMISP(url, key, ssl, 'json')


def saveEvent(misp, uuid):
    event = misp.get_event(uuid)
    if not event.json().get('Event'):
        print('Error while fetching event: {}'.format(event.json()['message']))
        sys.exit('Could not create file for event ' + uuid + '.')
    event = __cleanUpEvent(event)
    event = json.dumps(event)
    eventFile = open(os.path.join(outputdir, uuid + '.json'), 'w')
    eventFile.write(event)
    eventFile.close()


def __cleanUpEvent(event):
        temp = event.json()
        event = {'Event': {}}
        __cleanupEventFields(event, temp)
        __cleanupEventObjects(event, temp)
        return event


def __cleanupEventFields(event, temp):
    for field in fieldsToSave:
        if field in temp['Event'].keys():
            event['Event'][field] = temp['Event'][field]
    return event


def __blockAttributeByDistribution(attribute):
    if attribute['distribution'] not in valid_attribute_distributions:
        return True
    return False


def __cleanupEventObjects(event, temp):
    for objectType in objectsToSave.keys():
        if objectsToSave[objectType]['multiple'] is True:
            if objectType in temp['Event']:
                for objectInstance in temp['Event'][objectType]:
                    if objectType is 'Attribute':
                        if __blockAttributeByDistribution(objectInstance):
                            continue
                    tempObject = {}
                    for field in objectsToSave[objectType]['fields']:
                        if field in objectInstance.keys():
                            tempObject[field] = objectInstance[field]
                    if objectType not in event['Event']:
                        event['Event'][objectType] = []
                    event['Event'][objectType].append(tempObject)
        else:
            tempObject = {}
            for field in objectsToSave[objectType]['fields']:
                tempObject[field] = temp['Event'][objectType][field]
            event['Event'][objectType] = tempObject
    return event


def saveManifest(manifest):
    try:
        manifestFile = open(os.path.join(outputdir, 'manifest.json'), 'w')
        manifestFile.write(json.dumps(manifest))
        manifestFile.close()
    except Exception as e:
        print(e)
        sys.exit('Could not create the manifest file.')


def __addEventToManifest(event):
    tags = []
    for eventTag in event['EventTag']:
        tags.append({'name': eventTag['Tag']['name'],
                     'colour': eventTag['Tag']['colour']})
    return {'Orgc': event['Orgc'],
            'Tag': tags,
            'info': event['info'],
            'date': event['date'],
            'analysis': event['analysis'],
            'threat_level_id': event['threat_level_id'],
            'timestamp': event['timestamp']
            }


if __name__ == '__main__':
    misp = init()
    result = misp.get_index(None, filters)
    try:
        events = result.json()
    except:
        sys.exit("Invalid response received from MISP.")
    if len(events) == 0:
        sys.exit("No events returned.")
    manifest = {}
    counter = 1
    total = len(events)
    for event in events:
        saveEvent(misp, event['uuid'])
        manifest[event['uuid']] = __addEventToManifest(event)
        print("Event " + str(counter) + "/" + str(total) + " exported.")
        counter += 1
    saveManifest(manifest)
    print('Manifest saved. Feed creation completed.')