#!/usr/bin/env python3

import argparse
import sys
import json
import subprocess
import os
from cpedb import CPEDB, CPE


def gen_update_xml_reports(cpeids, cpedb, output):
    cpe_need_update = []

    for cpe in cpeids:
        result = cpedb.find(cpe)
        if not result:
            result = cpedb.find_partial(CPE.no_version(cpe))
            if result:
                cpe_need_update.append(cpe)
            else:
                print("WARNING: no match found for '%s'" % cpe)

    for cpe in cpe_need_update:
        xml = cpedb.gen_update_xml(cpe)
        fname = CPE.product(cpe) + '-' + CPE.version(cpe) + '.xml'
        print("Generating %s" % fname)
        with open(os.path.join(output, fname), 'w+') as fp:
            fp.write(xml)

    print("Generated %d update files out of %d CPEs" % (len(cpe_need_update), len(cpeids)))


def get_cpe_ids():
    print("Getting list of CPE for enabled packages")
    cmd = ["make", "--no-print-directory", "show-info"]
    js = json.loads(subprocess.check_output(cmd).decode("utf-8"))
    return set([v["cpe-id"] for k, v in js.items() if "cpe-id" in v])


def resolvepath(path):
    return os.path.abspath(os.path.expanduser(path))


def parse_args():
    parser = argparse.ArgumentParser()
    parser.add_argument('--output', dest='output',
                        help='Path to the output CPE update files', type=resolvepath, required=True)
    parser.add_argument('--nvd-path', dest='nvd_path',
                        help='Path to the local NVD database', type=resolvepath, required=True)
    return parser.parse_args()


def __main__():
    args = parse_args()
    if not os.path.isdir(args.output):
        print("ERROR: output directory %s does not exist" % args.output)
        sys.exit(1)
    cpedb = CPEDB(args.nvd_path)
    cpedb.get_xml_dict()
    cpeids = get_cpe_ids()
    gen_update_xml_reports(cpeids, cpedb, args.output)


if __name__ == "__main__":
    __main__()