#!/usr/bin/python3
# Copyright 2012 Canonical Ltd.  This software is licensed under the GNU
# General Public License version 3 (see the file LICENSE).

from optparse import OptionParser
import os
import sys

from rscalib import (
    api_versions,
    UserError,
)

class Usage(UserError):

    status = 1


def get_sso_credentials(args, stream):
    """Determine SSO credentials from the args and stream."""
    if stream.isatty():
        raise Usage('Password must be provided on stdin.')
    if len(args) == 0:
        raise Usage('Email must be provided as the first argument.')
    password = sys.stdin.read().rstrip('\n')
    username = args[0]
    return username, password

def get_json_error(error_message):
    return '{ "Error": "%s" }' % error_message

def main(args):
    """Request data for the specified SSO credentials from the server.

    Prints the data in JSON format on success and a JSON error in the case
    of a failure.

    Exit status summary:
    0   Success
    1   Usage error
    2   Authentication error
    3   Connection error
    4   SSL Certificate verification error
    100 All other errors.
    """
    parser = OptionParser()
    parser.add_option('--skip-ssl-verify', action='store_true')
    options, args = parser.parse_args(args)
    verify_ssl = not options.skip_ssl_verify
    try:
        username, password = get_sso_credentials(args, sys.stdin)
        server_root = os.environ.get('SERVER_ROOT')
        api = api_versions[os.environ.get('API_VERSION', 'default')]
        sys.stdout.write(api.run(username, password, server_root, verify_ssl))
    except UserError as e:
        sys.stderr.write(str(e) + '\n')
        sys.stdout.write(get_json_error(str(e)) + '\n')
        sys.exit(e.status)
    except Exception as e:
        sys.stderr.write('Exception: ' + str(type(e)) + '\n' + str(e) + '\n')
        sys.stdout.write(get_json_error('Contact your administrator')+ '\n')
        sys.exit(100)
    else:
        sys.exit(0)


if __name__ == '__main__':
    main(sys.argv[1:])