#!/usr/bin/env python3
import json
import re
import os
import argparse

parser = argparse.ArgumentParser(description='Create a couple galaxy/cluster with cti\'s intrusion-sets\nMust be in the mitre/cti/enterprise-attack/intrusion-set folder')
parser.add_argument("-p", "--path", required=True, help="Path of the mitre/cti folder")

args = parser.parse_args()

values = []
misp_dir = '../../../'


domains = ['enterprise-attack', 'mobile-attack', 'pre-attack']
types = ['attack-pattern', 'course-of-action', 'intrusion-set', 'malware', 'tool']
all_data = {}  # variable that will contain everything

# read in existing data
# THIS IS FOR MIGRATION - reading the data from the enterprise-attack, mobile-attack, pre-attack
# first build a data set of the MISP Galaxy ATT&CK elements by using the UUID as reference, this speeds up lookups later on.
# at the end we will convert everything again to separate datasets
all_data_uuid = {}
for domain in domains:
    for t in types:
        fname = os.path.join(misp_dir, 'clusters', 'mitre-{}-{}.json'.format(domain, t))
        if os.path.exists(fname):
            # print("##### {}".format(fname))
            with open(fname) as f:
                file_data = json.load(f)
            # print(file_data)
            for value in file_data['values']:
                if value['uuid'] in all_data_uuid:
                    # exit("ERROR: Something is really wrong, we seem to have duplicates.")
                    # if it already exists we need to copy over all the data manually to merge it
                    # on the other hand, from a manual analysis it looks like it's mostly the relations that are different
                    # so now we will just copy over the relationships
                    # actually, at time of writing the code below results in no change as the new items always contained more than the previously seen items
                    value_orig = all_data_uuid[value['uuid']]
                    if 'related' in value_orig:
                        for related_item in value_orig['related']:
                            if related_item not in value['related']:
                                value['related'].append(related_item)
                all_data_uuid[value['uuid']] = value

# THIS IS FOR NORMAL OPERATIONS - reading from the very old and new models - one model per type
# FIXME implement this (copy paste above or put above in function and call function)


# now load the MITRE ATT&CK
for domain in domains:
    attack_dir = os.path.join(args.path, domain)
    if not os.path.exists(attack_dir):
        exit("ERROR: MITRE ATT&CK folder incorrect")

    with open(os.path.join(attack_dir, domain + '.json')) as f:
        attack_data = json.load(f)

    for item in attack_data['objects']:
        if item['type'] not in types:
            continue

        # print(json.dumps(item, indent=2, sort_keys=True, ensure_ascii=False))
        try:
            # build the new data structure
            value = {}
            uuid = re.search('--(.*)$', item['id']).group(0)[2:]
            # item exist already in the all_data set
            update = False
            if uuid in all_data_uuid:
                value = all_data_uuid[uuid]

            if 'description' in item:
                value['description'] = item['description']
            value['value'] = item['name'] + ' - ' + item['external_references'][0]['external_id']
            value['meta'] = {}
            value['meta']['refs'] = []
            value['uuid'] = re.search('--(.*)$', item['id']).group(0)[2:]

            if 'aliases' in item:
                value['meta']['synonyms'] = item['aliases']
            if 'x_mitre_aliases' in item:
                value['meta']['synonyms'] = item['x_mitre_aliases']

            for reference in item['external_references']:
                if 'url' in reference and reference['url'] not in value['meta']['refs']:
                    value['meta']['refs'].append(reference['url'])
                if 'external_id' in reference:
                    value['meta']['external_id'] = reference['external_id']

            if 'kill_chain_phases' in item:   # many (but not all) attack-patterns have this
                value['meta']['kill_chain'] = []
                for killchain in item['kill_chain_phases']:
                    value['meta']['kill_chain'].append(killchain['kill_chain_name'] + ':enterprise-attack:' + killchain['phase_name'])
            if 'x_mitre_data_sources' in item:
                value['meta']['mitre_data_sources'] = item['x_mitre_data_sources']
            if 'x_mitre_platforms' in item:
                value['meta']['mitre_platforms'] = item['x_mitre_platforms']

            # relationships will be build separately afterwards
            value['type'] = item['type']  # remove this before dump to json
            # print(json.dumps(value, sort_keys=True, indent=2))

            all_data_uuid[uuid] = value

        except Exception as e:
            print(json.dumps(item, sort_keys=True, indent=2))
            import traceback
            traceback.print_exc()

    # process the 'relationship' type as we now know the existence of all ATT&CK uuids
    for item in attack_data['objects']:
        if item['type'] != 'relationship':
            continue
        # print(json.dumps(item, indent=2, sort_keys=True, ensure_ascii=False))

        rel_type = item['relationship_type']
        dest_uuid = re.findall(r'--([0-9a-f-]+)', item['target_ref']).pop()
        source_uuid = re.findall(r'--([0-9a-f-]+)', item['source_ref']).pop()
        tags = []

        # add the relation in the defined way
        rel_source = {
            "dest-uuid": dest_uuid,
            "tags": [
                "estimative-language:likelihood-probability=\"almost-certain\""
            ],
            "type": rel_type
        }
        if 'relation' not in all_data_uuid[source_uuid]:
            all_data_uuid[source_uuid]['relation'] = []
        if rel_source not in all_data_uuid[source_uuid]['relation']:
            all_data_uuid[source_uuid]['relation'].append(rel_source)

        # LATER find the opposite word of "rel_type" and build the relation in the opposite direction

# dump all_data to their respective file
for t in types:
    fname = os.path.join(misp_dir, 'clusters', 'mitre-{}.json'.format(t))
    if not os.path.exists(fname):
        exit("File {} does not exist, this is unexpected.".format(fname))
        # print("##### {}".format(fname))
    with open(fname) as f:
        file_data = json.load(f)

    file_data['values'] = []
    for item in all_data_uuid.values():
        if item['type'] != t:
            continue
        item.pop('type', None)
        file_data['values'].append(item)

    with open(fname, 'w') as f:
        json.dump(file_data, f, indent=2, sort_keys=True, ensure_ascii=False)
        f.write('\n')  # only needed for the beauty and to be compliant with jq_all_the_things