#!/usr/bin/python3

# Copyright (c) 2006 Canonical Ltd.
# Author: Martin Pitt <martin.pitt@ubuntu.com>
#
# This program is free software; you can redistribute it and/or modify it
# under the terms of the GNU General Public License as published by the
# Free Software Foundation; either version 2 of the License, or (at your
# option) any later version.  See http://www.gnu.org/copyleft/gpl.html for
# the full text of the license.

"""Extract the fields of a problem report into separate files into a new or
empty directory."""

# pylint: disable=invalid-name
# pylint: enable=invalid-name

import argparse
import gettext
import gzip
import os
import sys
from gettext import gettext as _

import problem_report
from apport import fatal


def parse_args():
    """Parse command line arguments."""
    parser = argparse.ArgumentParser(usage=_("%(prog)s <report> <target directory>"))
    parser.add_argument("report", help=_("Report file to unpack"))
    parser.add_argument("target_directory", help=_("directory to unpack report to"))
    return parser.parse_args()


def load_report(report_filename: str) -> problem_report.ProblemReport:
    """Load problem report from given filename."""
    report = problem_report.ProblemReport()
    if report_filename == "-":
        report.load(sys.stdin, binary=False)
    elif report_filename.endswith(".gz"):
        with gzip.open(report_filename, "rb") as report_file:
            report.load(report_file, binary=False)
    else:
        with open(report_filename, "rb") as report_file:
            report.load(report_file, binary=False)
    return report


# pylint: disable-next=missing-function-docstring
def main():
    gettext.textdomain("apport")
    args = parse_args()

    # ensure that the directory does not yet exist or is empty
    try:
        if os.path.isdir(args.target_directory):
            if os.listdir(args.target_directory):
                fatal(_("Destination directory exists and is not empty."))
        else:
            os.mkdir(args.target_directory)
    except OSError as error:
        fatal("%s", str(error))

    bin_keys = []
    try:
        report = load_report(args.report)
    except (OSError, problem_report.MalformedProblemReport) as error:
        fatal("%s", str(error))
    for key, value in report.items():
        if value is None:
            bin_keys.append(key)
            continue
        with open(os.path.join(args.target_directory, key), "wb") as key_file:
            if isinstance(value, str):
                key_file.write(value.encode("UTF-8"))
            else:
                key_file.write(value)
    try:
        if args.report.endswith(".gz"):
            with gzip.open(args.report, "rb") as key_file:
                report.extract_keys(key_file, bin_keys, args.target_directory)
        else:
            with open(args.report, "rb") as key_file:
                report.extract_keys(key_file, bin_keys, args.target_directory)
    except (OSError, problem_report.MalformedProblemReport) as error:
        fatal("%s", str(error))


if __name__ == "__main__":
    main()
