#!/usr/bin/env python3

import database
import argparse
import sys


if __name__ == '__main__':

    # Parsing arguments
    parser = argparse.ArgumentParser(
        description="Export the hostnames rules stored "
        "in the Database as plain text")
    parser.add_argument(
        '-o', '--output', type=argparse.FileType('w'), default=sys.stdout,
        help="Output file, one rule per line")
    parser.add_argument(
        '-f', '--first-party', action='store_true',
        help="Only output rules issued from first-party sources")
    parser.add_argument(
        '-e', '--end-chain', action='store_true',
        help="Only output rules that are not referenced by any other")
    parser.add_argument(
        '-r', '--rules', action='store_true',
        help="Output all kinds of rules, not just hostnames")
    parser.add_argument(
        '-b', '--base-rules', action='store_true',
        help="Output base rules "
        "(the ones added by ./feed_rules.py) "
        "(implies --rules)")
    parser.add_argument(
        '-d', '--no-dupplicates', action='store_true',
        help="Do not output rules that already match a zone/network rule "
        "(e.g. dummy.example.com when there's a zone example.com rule)")
    parser.add_argument(
        '-x', '--explain', action='store_true',
        help="Show the chain of rules leading to one "
        "(and the number of references they have)")
    parser.add_argument(
        '-c', '--count', action='store_true',
        help="Show the number of rules per type instead of listing them")
    args = parser.parse_args()

    DB = database.Database()

    if args.count:
        assert not args.explain
        print(DB.count_records(
            first_party_only=args.first_party,
            end_chain_only=args.end_chain,
            no_dupplicates=args.no_dupplicates,
            rules_only=args.base_rules,
            hostnames_only=not (args.rules or args.base_rules),
        ))
    else:
        for domain in DB.list_records(
            first_party_only=args.first_party,
            end_chain_only=args.end_chain,
            no_dupplicates=args.no_dupplicates,
            rules_only=args.base_rules,
            hostnames_only=not (args.rules or args.base_rules),
            explain=args.explain,
        ):
            print(domain, file=args.output)