#!/usr/bin/env python

import sys
import csv
import argparse
from collections import defaultdict

warn = 'Warning: {} file "{}" is touched by more than one package: {}\n'

def main():
    parser = argparse.ArgumentParser()
    parser.add_argument('packages_file_list', nargs='*',
                    help='The packages-file-list to check from')
    parser.add_argument('-t', '--type', metavar="TYPE",
                        help='Report as a TYPE file (TYPE is either target, staging, or host)')

    args = parser.parse_args()

    if not len(args.packages_file_list) == 1:
        sys.stderr.write('No packages-file-list was provided.\n')
        return False

    if args.type is None:
        sys.stderr.write('No type was provided\n')
        return False

    file_to_pkg = defaultdict(list)
    with open(args.packages_file_list[0], 'r') as pkg_file_list:
        r = csv.reader(pkg_file_list, delimiter=',')
        for row in r:
            pkg = row[0]
            file = row[1]
            file_to_pkg[file].append(pkg)

    for file in file_to_pkg:
        if len(file_to_pkg[file]) > 1:
            sys.stderr.write(warn.format(args.type, file, file_to_pkg[file]))

if __name__ == "__main__":
    sys.exit(main())