#!/usr/bin/env python3
"""
Query LDAP directory for users and print it in a mutt query format.
"""
import argparse
import sys

import ldap3


def first(values):
    if values is None or len(values) == 0:
        return ""
    return values[0]


def split_to_list(string):
    return string.split(',')


def ldap_search(args):
    search_filter = [f'({f}=*{args.term}*)' for f in args.search_filters]
    search_filter = '(|' + ''.join(search_filter) + ')'

    with ldap3.Connection(ldap3.Server(args.server, port=args.port),
                          auto_bind=ldap3.AUTO_BIND_NO_TLS,
                          read_only=True,
                          check_names=True,
                          user=args.username, password=args.password) as c:
        results = c.extend.standard.paged_search(search_base=args.search_base,
                                                 search_filter=search_filter,
                                                 search_scope=ldap3.SUBTREE,
                                                 attributes=list(args.search_attributes),
                                                 get_operational_attributes=True,
                                                 generator=False)
        count = len(results)
        if count:
            print(f'Found {count} entries:')
            for r in results:
                attrs = [first(r['attributes'][attr]) for attr in args.search_attributes[:2]]
                attrs.append(' / '.join([first(r['attributes'][attr]) for attr in args.search_attributes[2:]]))
                last = '\t'.join(attrs)
                print(last)
        else:
            print('Not found.')


def main():
    parser = argparse.ArgumentParser(description=__doc__)
    parser.add_argument('term', help="search term")
    parser.add_argument('-s', '--server', required=True, help='server hostname')
    parser.add_argument('-p', '--port', type=int, default=389, help='server port (default: %(default)s)')
    parser.add_argument('-u', '--username', help='username')
    parser.add_argument('-P', '--password', help='password')
    parser.add_argument('-b', '--search-base', metavar="SB", default='ou=people', type=split_to_list,
                        help="search base string (default: %(default)s)")
    parser.add_argument('-f', '--search-filters', metavar="FILTERS",
                        default='mail,cn', type=split_to_list,
                        help="list of fields to filter (default: %(default)s)")
    parser.add_argument('-a', '--search-attributes', metavar="ATTRIBUTES",
                        default='mail,cn', type=split_to_list,
                        help="list of resulting attributes (default: %(default)s)")
    args = parser.parse_args()

    ldap_search(args)


if __name__ == '__main__':
    try:
        main()
    except Exception as e:
        print(e)
        sys.exit(1)