# Copyright 2020, Red Hat, Inc.
#
# 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.

from __future__ import absolute_import, division, print_function
__metaclass__ = type

from ansible.module_utils.basic import AnsibleModule
import datetime
import json
import os


ANSIBLE_METADATA = {
    'metadata_version': '1.1',
    'status': ['preview'],
    'supported_by': 'community'
}

DOCUMENTATION = '''
---
module: radosgw_zone

short_description: Manage RADOS Gateway Zone

version_added: "2.8"

description:
    - Manage RADOS Gateway zone(s) creation, deletion and updates.
options:
    cluster:
        description:
            - The ceph cluster name.
        required: false
        default: ceph
    name:
        description:
            - name of the RADOS Gateway zone.
        required: true
    state:
        description:
            If 'present' is used, the module creates a zone if it doesn't
            exist or update it if it already exists.
            If 'absent' is used, the module will simply delete the zone.
            If 'info' is used, the module will return all details about the
            existing zone (json formatted).
        required: false
        choices: ['present', 'absent', 'info']
        default: present
    realm:
        description:
            - name of the RADOS Gateway realm.
        required: true
    zonegroup:
        description:
            - name of the RADOS Gateway zonegroup.
        required: true
    endpoints:
        description:
            - endpoints of the RADOS Gateway zone.
        required: false
        default: []
    access_key:
        description:
            - set the S3 access key of the user.
        required: false
        default: None
    secret_key:
        description:
            - set the S3 secret key of the user.
        required: false
        default: None
    default:
        description:
            - set the default flag on the zone.
        required: false
        default: false
    master:
        description:
            - set the master flag on the zone.
        required: false
        default: false

author:
    - Dimitri Savineau <dsavinea@redhat.com>
'''

EXAMPLES = '''
- name: create a RADOS Gateway default zone
  radosgw_zone:
    name: z1
    realm: foo
    zonegroup: bar
    endpoints:
      - http://192.168.1.10:8080
      - http://192.168.1.11:8080
    default: true

- name: get a RADOS Gateway zone information
  radosgw_zone:
    name: z1
    state: info

- name: delete a RADOS Gateway zone
  radosgw_zone:
    name: z1
    state: absent
'''

RETURN = '''#  '''


def fatal(message, module):
    '''
    Report a fatal error and exit
    '''
    if module:
        module.fail_json(msg=message, rc=1)
    else:
        raise(Exception(message))


def container_exec(binary, container_image):
    '''
    Build the docker CLI to run a command inside a container
    '''

    container_binary = os.getenv('CEPH_CONTAINER_BINARY')
    command_exec = [container_binary,
                    'run',
                    '--rm',
                    '--net=host',
                    '-v', '/etc/ceph:/etc/ceph:z',
                    '-v', '/var/lib/ceph/:/var/lib/ceph/:z',
                    '-v', '/var/log/ceph/:/var/log/ceph/:z',
                    '--entrypoint=' + binary, container_image]
    return command_exec


def is_containerized():
    '''
    Check if we are running on a containerized cluster
    '''

    if 'CEPH_CONTAINER_IMAGE' in os.environ:
        container_image = os.getenv('CEPH_CONTAINER_IMAGE')
    else:
        container_image = None

    return container_image


def pre_generate_radosgw_cmd(container_image=None):
    '''
    Generate radosgw-admin prefix comaand
    '''
    if container_image:
        cmd = container_exec('radosgw-admin', container_image)
    else:
        cmd = ['radosgw-admin']

    return cmd


def generate_radosgw_cmd(cluster, args, container_image=None):
    '''
    Generate 'radosgw' command line to execute
    '''

    cmd = pre_generate_radosgw_cmd(container_image=container_image)

    base_cmd = [
        '--cluster',
        cluster,
        'zone'
    ]

    cmd.extend(base_cmd + args)

    return cmd


def exec_commands(module, cmd):
    '''
    Execute command(s)
    '''

    rc, out, err = module.run_command(cmd)

    return rc, cmd, out, err


def create_zone(module, container_image=None):
    '''
    Create a new zone
    '''

    cluster = module.params.get('cluster')
    name = module.params.get('name')
    realm = module.params.get('realm')
    zonegroup = module.params.get('zonegroup')
    endpoints = module.params.get('endpoints')
    access_key = module.params.get('access_key')
    secret_key = module.params.get('secret_key')
    default = module.params.get('default')
    master = module.params.get('master')

    args = [
        'create',
        '--rgw-realm=' + realm,
        '--rgw-zonegroup=' + zonegroup,
        '--rgw-zone=' + name
    ]

    if endpoints:
        args.extend(['--endpoints=' + ','.join(endpoints)])

    if access_key:
        args.extend(['--access-key=' + access_key])

    if secret_key:
        args.extend(['--secret-key=' + secret_key])

    if default:
        args.append('--default')

    if master:
        args.append('--master')

    cmd = generate_radosgw_cmd(cluster=cluster,
                               args=args,
                               container_image=container_image)

    return cmd


def modify_zone(module, container_image=None):
    '''
    Modify a new zone
    '''

    cluster = module.params.get('cluster')
    name = module.params.get('name')
    realm = module.params.get('realm')
    zonegroup = module.params.get('zonegroup')
    endpoints = module.params.get('endpoints')
    access_key = module.params.get('access_key')
    secret_key = module.params.get('secret_key')
    default = module.params.get('default')
    master = module.params.get('master')

    args = [
        'modify',
        '--rgw-realm=' + realm,
        '--rgw-zonegroup=' + zonegroup,
        '--rgw-zone=' + name
    ]

    if endpoints:
        args.extend(['--endpoints=' + ','.join(endpoints)])

    if access_key:
        args.extend(['--access-key=' + access_key])

    if secret_key:
        args.extend(['--secret-key=' + secret_key])

    if default:
        args.append('--default')

    if master:
        args.append('--master')

    cmd = generate_radosgw_cmd(cluster=cluster,
                               args=args,
                               container_image=container_image)

    return cmd


def get_zone(module, container_image=None):
    '''
    Get existing zone
    '''

    cluster = module.params.get('cluster')
    name = module.params.get('name')
    realm = module.params.get('realm')
    zonegroup = module.params.get('zonegroup')

    args = [
        'get',
        '--rgw-realm=' + realm,
        '--rgw-zonegroup=' + zonegroup,
        '--rgw-zone=' + name,
        '--format=json'
    ]

    cmd = generate_radosgw_cmd(cluster=cluster,
                               args=args,
                               container_image=container_image)

    return cmd


def get_zonegroup(module, container_image=None):
    '''
    Get existing zonegroup
    '''

    cluster = module.params.get('cluster')
    realm = module.params.get('realm')
    zonegroup = module.params.get('zonegroup')

    cmd = pre_generate_radosgw_cmd(container_image=container_image)

    args = [
        '--cluster',
        cluster,
        'zonegroup',
        'get',
        '--rgw-realm=' + realm,
        '--rgw-zonegroup=' + zonegroup,
        '--format=json'
    ]

    cmd.extend(args)

    return cmd


def remove_zone(module, container_image=None):
    '''
    Remove a zone
    '''

    cluster = module.params.get('cluster')
    name = module.params.get('name')
    realm = module.params.get('realm')
    zonegroup = module.params.get('zonegroup')

    args = [
        'delete',
        '--rgw-realm=' + realm,
        '--rgw-zonegroup=' + zonegroup,
        '--rgw-zone=' + name
    ]

    cmd = generate_radosgw_cmd(cluster=cluster,
                               args=args,
                               container_image=container_image)

    return cmd


def exit_module(module, out, rc, cmd, err, startd, changed=False):
    endd = datetime.datetime.now()
    delta = endd - startd

    result = dict(
        cmd=cmd,
        start=str(startd),
        end=str(endd),
        delta=str(delta),
        rc=rc,
        stdout=out.rstrip("\r\n"),
        stderr=err.rstrip("\r\n"),
        changed=changed,
    )
    module.exit_json(**result)


def run_module():
    module_args = dict(
        cluster=dict(type='str', required=False, default='ceph'),
        name=dict(type='str', required=True),
        state=dict(type='str', required=False, choices=['present', 'absent', 'info'], default='present'),  # noqa: E501
        realm=dict(type='str', require=True),
        zonegroup=dict(type='str', require=True),
        endpoints=dict(type='list', require=False, default=[]),
        access_key=dict(type='str', required=False),
        secret_key=dict(type='str', required=False),
        default=dict(type='bool', required=False, default=False),
        master=dict(type='bool', required=False, default=False),
    )

    module = AnsibleModule(
        argument_spec=module_args,
        supports_check_mode=True,
    )

    # Gather module parameters in variables
    name = module.params.get('name')
    state = module.params.get('state')
    endpoints = module.params.get('endpoints')
    access_key = module.params.get('access_key')
    secret_key = module.params.get('secret_key')

    if module.check_mode:
        module.exit_json(
            changed=False,
            stdout='',
            stderr='',
            rc=0,
            start='',
            end='',
            delta='',
        )

    startd = datetime.datetime.now()
    changed = False

    # will return either the image name or None
    container_image = is_containerized()

    if state == "present":
        rc, cmd, out, err = exec_commands(module, get_zone(module, container_image=container_image))  # noqa: E501
        if rc == 0:
            zone = json.loads(out)
            _rc, _cmd, _out, _err = exec_commands(module, get_zonegroup(module, container_image=container_image))  # noqa: E501
            if _rc == 0:
                zonegroup = json.loads(_out)
                if not access_key:
                    access_key = ''
                if not secret_key:
                    secret_key = ''
                current = {
                    'endpoints': next(zone['endpoints'] for zone in zonegroup['zones'] if zone['name'] == name),  # noqa: E501
                    'access_key': zone['system_key']['access_key'],
                    'secret_key': zone['system_key']['secret_key']
                }
                asked = {
                    'endpoints': endpoints,
                    'access_key': access_key,
                    'secret_key': secret_key
                }
                if current != asked:
                    rc, cmd, out, err = exec_commands(module, modify_zone(module, container_image=container_image))  # noqa: E501
                    changed = True
            else:
                fatal(_err, module)
        else:
            rc, cmd, out, err = exec_commands(module, create_zone(module, container_image=container_image))  # noqa: E501
            changed = True

    elif state == "absent":
        rc, cmd, out, err = exec_commands(module, get_zone(module, container_image=container_image))  # noqa: E501
        if rc == 0:
            rc, cmd, out, err = exec_commands(module, remove_zone(module, container_image=container_image))  # noqa: E501
            changed = True
        else:
            rc = 0
            out = "Zone {} doesn't exist".format(name)

    elif state == "info":
        rc, cmd, out, err = exec_commands(module, get_zone(module, container_image=container_image))  # noqa: E501

    exit_module(module=module, out=out, rc=rc, cmd=cmd, err=err, startd=startd, changed=changed)  # noqa: E501


def main():
    run_module()


if __name__ == '__main__':
    main()