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#!/opt/imh-python/bin/python3
"""New Apache Log Parser - cli version"""
import sys
import functools
from tabulate import tabulate
from pathlib import Path
from argparse import ArgumentParser, RawDescriptionHelpFormatter
from datetime import datetime
from rads.color import magenta
from textwrap import wrap

NLP_SCRIPTS = Path(__file__).parent / 'nlp_scripts'
sys.path.insert(0, str(NLP_SCRIPTS))
import nlp_funcs as nlp  # pylint: disable=wrong-import-position

AWK_SCRIPT = str(NLP_SCRIPTS / 'nlp-awk.sh')


def header(text: str, width: int) -> None:
    """Prints a pretty header"""
    hline = "".join("-" for i in range(width - len(text) - 2))
    print(magenta(f"{text}-{hline}"))


def col_print(data: list[list[str]], width: int):
    """Prints pretty columns"""
    for line in tabulate(data, tablefmt='plain').splitlines():
        print(line[:width].rstrip())


def inline_print(data: dict[int, int], width: int):
    """inline-print a dict, word wrapping as necessary"""
    # abuse the fact that textwrap.wrap can be made to ignore hyphens:
    # data = {7: 945, 8: 933, 9: 1078}
    # text = '7--945 8--933 9--1078'
    # wrap() then wraps on the spaces between, and we
    # convert the '--' back to ': ' before printing
    text = ' '.join([f"{k}--{v}" for k, v in data.items()])
    lines = [
        x.replace('--', ': ')
        for x in wrap(text, break_on_hyphens=False, width=width)
    ]
    print(*lines, sep='\n')


def print_out(data: nlp.NLPData, width: int, nlines: int, ptr: bool):
    """Prints all the things"""
    col_pr = functools.partial(col_print, width=width)
    for date_str, hourly_hits in data["hourly_hits"].items():
        header(f"Hourly hits ({date_str})", width)
        inline_print(hourly_hits, width)
    header("HTTP response codes", width)
    inline_print(data["http_codes"], width)
    header("Duplicate requests + response codes", width)
    col_pr(data["requests"][:nlines])
    header("Requests for non-static content", width)
    col_pr(data["dynamic"][:nlines])
    header("Top user agents", width)
    col_pr(data["user_agents"][:nlines])
    src_ips = data["src_ips"][:nlines]
    if ptr:
        for ip_line in src_ips:
            # ip_line = [count, ipaddr]. append PTR
            ip_line.append(nlp.ptr_lookup(ip_line[1]))
        header("Top IPs with PTR records", width)
    else:
        header("Top IPs", width)
    col_pr(src_ips)


def parse_args():
    """parse sys.argv"""
    parser = ArgumentParser(
        formatter_class=RawDescriptionHelpFormatter, description=__doc__
    )
    parser.epilog = f"""Piping stdout to nlp:
    awk '$7 ~ /php/' /home/userna5/access-logs/* | {parser.prog} -n 50
    grep -h 'bot' * | {parser.prog}
    zcat domain.com.gz domain2.net.gz | {parser.prog} -d 4/20"""
    # fmt: off
    parser.add_argument(
        '-n', type=int, default=10, dest='nlines', metavar='int',
        help='Number of lines to display in each section. '
        'Specifying -1 will display every possible line of output.',
    )
    parser.add_argument(
        '-w', type=int, default=100, dest='width', metavar='int',
        help='Width of output in characters. Specifying -1 will display '
        'output with no limit. Defaults to 100.',
    )
    parser.add_argument(
        '-d', dest='date', metavar='mm/dd',
        type=lambda x: datetime.strptime(x, '%m/%d').strftime('%d/%b'),
        help='Display records only matching a specific date',
    )
    parser.add_argument(
        '-p', '--with-ptr', dest='ptr', action='store_const', const=True,
        help='Get PTR records for IPs. PTRs are resolved by default '
        'when 25 or fewer lines are printed. Specifying this option '
        'will override the default behavior and always resolve PTRs.',
    )
    parser.add_argument(
        '-P', '--no-ptr', dest='ptr', action='store_const', const=False,
        help='Do not resolve PTRs for IPs',
    )
    parser.add_argument('target', metavar='(log file|cPanel user)', nargs='?')
    # fmt: on
    args = parser.parse_args()
    if args.nlines < -1 or args.width < -1:
        parser.print_help()
        sys.exit(1)
    if args.ptr is None:
        args.ptr = args.nlines < 25 and args.nlines != -1
    return args


def main():
    args = parse_args()
    with nlp.open_log(args.target) as log:
        with nlp.start_nlp(AWK_SCRIPT, args.date, log) as proc:
            data = nlp.get_input(proc.stdout, args.nlines)
    print_out(data, args.width, args.nlines, args.ptr)


if __name__ == '__main__':
    try:
        main()
    except KeyboardInterrupt:
        pass