#!/usr/bin/env python
# PYTHON_ARGCOMPLETE_OK

# (c) 2016 Red Hat, Inc.
#
# This file is part of Ansible
#
# Ansible 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 3 of the License, or
# (at your option) any later version.
#
# Ansible is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with Ansible.  If not, see <http://www.gnu.org/licenses/>.
"""CLI tool for starting new Shippable CI runs."""
from __future__ import (absolute_import, division, print_function)
__metaclass__ = type

# noinspection PyCompatibility
import argparse
import json
import os

import requests

try:
    import argcomplete
except ImportError:
    argcomplete = None


def main():
    """Main program body."""
    args = parse_args()
    start_run(args)


def parse_args():
    """Parse and return args."""
    api_key = get_api_key()

    parser = argparse.ArgumentParser(description='Start a new Shippable run.')

    parser.add_argument('project',
                        metavar='account/project',
                        help='Shippable account/project')

    target = parser.add_mutually_exclusive_group()

    target.add_argument('--branch',
                        help='branch name')

    target.add_argument('--run',
                        metavar='ID',
                        help='Shippable run ID')

    parser.add_argument('--key',
                        metavar='KEY',
                        default=api_key,
                        required=not api_key,
                        help='Shippable API key')

    parser.add_argument('--env',
                        nargs=2,
                        metavar=('KEY', 'VALUE'),
                        action='append',
                        help='environment variable to pass')

    if argcomplete:
        argcomplete.autocomplete(parser)

    args = parser.parse_args()

    return args


def start_run(args):
    """Start a new Shippable run."""
    headers = dict(
        Authorization='apiToken %s' % args.key,
    )

    # get project ID

    data = dict(
        projectFullNames=args.project,
    )

    url = 'https://api.shippable.com/projects'
    response = requests.get(url, data, headers=headers)

    if response.status_code != 200:
        raise Exception(response.content)

    result = response.json()

    if len(result) != 1:
        raise Exception(
            'Received %d items instead of 1 looking for %s in:\n%s' % (
                len(result),
                args.project,
                json.dumps(result, indent=4, sort_keys=True)))

    project_id = response.json()[0]['id']

    # new build

    data = dict(
        globalEnv=dict((kp[0], kp[1]) for kp in args.env or [])
    )

    if args.branch:
        data['branchName'] = args.branch
    elif args.run:
        data['runId'] = args.run

    url = 'https://api.shippable.com/projects/%s/newBuild' % project_id
    response = requests.post(url, json=data, headers=headers)

    if response.status_code != 200:
        raise Exception("HTTP %s: %s\n%s" % (response.status_code, response.reason, response.content))

    print(json.dumps(response.json(), indent=4, sort_keys=True))


def get_api_key():
    """
    rtype: str
    """
    key = os.environ.get('SHIPPABLE_KEY', None)

    if key:
        return key

    path = os.path.join(os.environ['HOME'], '.shippable.key')

    try:
        with open(path, 'r') as key_fd:
            return key_fd.read().strip()
    except IOError:
        return None


if __name__ == '__main__':
    main()