#! /usr/bin/env python
#
#    Licensed under the Apache License, Version 2.0 (the "License"); you may
#    not use this file except in compliance with the License. You may obtain
#    a copy of the License at
#
#         http://www.apache.org/licenses/LICENSE-2.0
#
#    Unless required by applicable law or agreed to in writing, software
#    distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
#    WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
#    License for the specific language governing permissions and limitations
#    under the License.

"""Generate list of cinder drivers"""

import argparse
import os

from cinder.interface import util


parser = argparse.ArgumentParser(prog="generate_driver_list")

parser.add_argument("--format", default='str', choices=['str', 'dict'],
                    help="Output format type")

# Keep backwards compatibilty with the gate-docs test
# The tests pass ['docs'] on the cmdln, but it's never been used.
parser.add_argument("output_list", default=None, nargs='?')

CI_WIKI_ROOT = "https://wiki.openstack.org/wiki/ThirdPartySystems/"


class Output(object):

    def __init__(self, base_dir, output_list):
        # At this point we don't care what was passed in, just a trigger
        # to write this out to the doc tree for now
        self.driver_file = None
        if output_list:
            self.driver_file = open(
                '%s/doc/source/drivers.rst' % base_dir, 'w+')
            self.driver_file.write('===================\n')
            self.driver_file.write('Available Drivers\n')
            self.driver_file.write('===================\n\n')

    def __enter__(self):
        return self

    def __exit__(self, type, value, traceback):
        if self.driver_file:
            self.driver_file.close()

    def write(self, text):
        if self.driver_file:
            self.driver_file.write('%s\n' % text)
        else:
            print(text)


def format_description(desc, output):
    desc = desc or '<None>'
    lines = desc.rstrip('\n').split('\n')
    for line in lines:
        output.write('    %s' % line)


def print_drivers(drivers, config_name, output):
    for driver in sorted(drivers, key=lambda x: x.class_fqn):
        output.write(driver.class_name)
        output.write('-' * len(driver.class_name))
        if driver.version:
            output.write('* Version: %s' % driver.version)
        output.write('* %s=%s' % (config_name, driver.class_fqn))
        if driver.ci_wiki_name:
            output.write('* CI info: %s%s' % (CI_WIKI_ROOT,
                                              driver.ci_wiki_name))
        output.write('* Description:')
        format_description(driver.desc, output)
        output.write('')
    output.write('')


def output_str(cinder_root, args):
    with Output(cinder_root, args.output_list) as output:
        output.write('Volume Drivers')
        output.write('==============')
        print_drivers(util.get_volume_drivers(), 'volume_driver', output)

        output.write('Backup Drivers')
        output.write('==============')
        print_drivers(util.get_backup_drivers(), 'backup_driver', output)

        output.write('FC Zone Manager Drivers')
        output.write('=======================')
        print_drivers(util.get_fczm_drivers(), 'zone_driver', output)


def collect_driver_info(driver):
    """Build the dictionary that describes this driver."""

    info = {'name': driver.class_name,
            'version': driver.version,
            'fqn': driver.class_fqn,
            'description': driver.desc,
            'ci_wiki_name': driver.ci_wiki_name}

    return info


def output_dict():

    import pprint
    driver_list = []
    drivers = util.get_volume_drivers()
    for driver in drivers:
        driver_list.append(collect_driver_info(driver))

    pprint.pprint(driver_list)


def main():
    tools_dir = os.path.dirname(os.path.abspath(__file__))
    cinder_root = os.path.dirname(tools_dir)
    cur_dir = os.getcwd()
    os.chdir(cinder_root)
    args = parser.parse_args()

    try:
        if args.format == 'str':
            output_str(cinder_root, args)
        elif args.format == 'dict':
            output_dict()

    finally:
        os.chdir(cur_dir)

if __name__ == '__main__':
    main()

[(23, 'argparse.ArgumentParser', 'argparse.ArgumentParser', False, 'import argparse\n'), (116, 'cinder.interface.util.get_volume_drivers', 'util.get_volume_drivers', False, 'from cinder.interface import util\n'), (120, 'pprint.pprint', 'pprint.pprint', False, 'import pprint\n'), (125, 'os.path.dirname', 'os.path.dirname', False, 'import os\n'), (126, 'os.getcwd', 'os.getcwd', False, 'import os\n'), (127, 'os.chdir', 'os.chdir', False, 'import os\n'), (124, 'os.path.abspath', 'os.path.abspath', False, 'import os\n'), (137, 'os.chdir', 'os.chdir', False, 'import os\n'), (89, 'cinder.interface.util.get_volume_drivers', 'util.get_volume_drivers', False, 'from cinder.interface import util\n'), (93, 'cinder.interface.util.get_backup_drivers', 'util.get_backup_drivers', False, 'from cinder.interface import util\n'), (97, 'cinder.interface.util.get_fczm_drivers', 'util.get_fczm_drivers', False, 'from cinder.interface import util\n')]