#!/usr/bin/env python3
# pylint: disable=C0103

"""
Extract the domains to block as a whole
from a AdBlock rules list.
"""

import argparse
import sys
import typing

import abp.filters


def get_domains(rule: abp.filters.parser.Filter) -> typing.Iterable[str]:
    if rule.options:
        return
    selector_type = rule.selector["type"]
    selector_value = rule.selector["value"]
    if (
        selector_type == "url-pattern"
        and selector_value.startswith("||")
        and selector_value.endswith("^")
    ):
        yield selector_value[2:-1]


if __name__ == "__main__":

    # Parsing arguments
    parser = argparse.ArgumentParser(
        description="Extract whole domains from an AdBlock blocking list"
    )
    parser.add_argument(
        "-i",
        "--input",
        type=argparse.FileType("r"),
        default=sys.stdin,
        help="Input file with AdBlock rules",
    )
    parser.add_argument(
        "-o",
        "--output",
        type=argparse.FileType("w"),
        default=sys.stdout,
        help="Outptut file with one rule tracking subdomain per line",
    )
    args = parser.parse_args()

    # Reading rules
    rules = abp.filters.parse_filterlist(args.input)

    # Filtering
    for rule in rules:
        if not isinstance(rule, abp.filters.parser.Filter):
            continue
        for domain in get_domains(rule):
            print(domain, file=args.output)