#!/usr/bin/python
# Copyright (c) 2017-present Alibaba Group Holding Limited. <xiaozhu36>
# GNU General Public License v3.0+ (see COPYING or https://www.gnu.org/licenses/gpl-3.0.txt)

from __future__ import (absolute_import, division, print_function)

__metaclass__ = type

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

DOCUMENTATION = """
---
module: ali_vswitch
short_description: Manage subnet in Alibaba Cloud virtual private cloud(VPC)
description:
    - Manage subnet in Alibaba Cloud virtual private cloud(VPC).
      If an VSwitch ID or cidr block with VPC id is provided, the existing VSwitch (if any) will be modified.
options:
  state:
    description:
      -  Create or delete vswitch.
    choices: ['present', 'absent']
    default: 'present'
    type: str
  zone_id:
    description:
      - Aliyun availability zone ID which to launch the vswitch or list vswitches.
        It is required when creating a new vswitch.
    aliases: ['availability_zone', 'alicloud_zone']
    type: str
  vpc_id:
    description:
      - The ID of a VPC to which that Vswitch belongs.
        This is used in combination with C(cidr_block) to determine if a VSwitch already exists.
    required: True
    type: str
  cidr_block:
    description:
      - The CIDR block representing the Vswitch e.g. 10.0.0.0/8. The value must be sub cidr_block of Vpc.
        This is used in conjunction with the C(vpc_id) to ensure idempotence.
    required: True
    type: str
  name:
    description:
      - The name of vswitch, which is a string of 2 to 128 Chinese or English characters. It must begin with an
        uppercase/lowercase letter or a Chinese character and can contain numerals, "_" or "-".
        It cannot begin with http:// or https://.
    aliases: ['vswitch_name', 'subnet_name']
    type: str
  description:
    description:
      - The description of vswitch, which is a string of 2 to 256 characters. It cannot begin with http:// or https://.
    type: str
  vswitch_id:
    description:
      - VSwitch ID.
    aliases: ['subnet_id', 'id']
    type: str
  tags:
    description:
      - A hash/dictionaries of vswitch tags. C({"key":"value"})
    type: dict
  purge_tags:
    description:
      - Delete existing tags on the vswitch that are not specified in the task.
        If True, it means you have to specify all the desired tags on each task affecting a vswitch.
    default: False
    type: bool
requirements:
    - "python >= 3.6"
    - "footmark >= 1.13.0"
extends_documentation_fragment:
    - alibaba.alicloud.alicloud
author:
  - "He Guimin (@xiaozhu36)"
"""

EXAMPLES = """
# Note: These examples do not set authentication details, see the Alibaba Cloud Guide for details.
- name: Create a new vswitch
  alibaba.alicloud.ali_vswitch:
    cidr_block: '{{ cidr_blok }}'
    name: 'my-vsw'
    vpc_id: 'vpc-abc12345'

- name: Modify the existing vswitch
  alibaba.alicloud.ali_vswitch:
    cidr_block: '{{ cidr_blok }}'
    vpc_id: 'vpc-abc12345'
    name: 'my-vsw-from-ansible'

- name: Delete the existing vswitch
  alibaba.alicloud.ali_vswitch:
    cidr_block: '{{ cidr_blok }}'
    vpc_id: 'vpc-abc12345'
    state: 'absent'
"""

RETURN = '''
vswitch:
    description: Dictionary of vswitch values
    returned: always
    type: complex
    contains:
        id:
            description: alias of vswitch_id
            returned: always
            type: str
            sample: vsw-b883b2c4
        cidr_block:
            description: The IPv4 CIDR of the VSwitch
            returned: always
            type: str
            sample: "10.0.0.0/16"
        zone_id:
            description: Availability zone of the VSwitch
            returned: always
            type: str
            sample: cn-beijing-a
        state:
            description: state of the Subnet
            returned: always
            type: str
            sample: available
        is_default:
            description: indicates whether this is the default VSwitch
            returned: always
            type: bool
            sample: false
        tags:
            description: tags attached to the Subnet, includes name
            returned: always
            type: dict
            sample: {"Name": "My Subnet", "env": "staging"}
        vpc_id:
            description: the id of the VPC where this VSwitch exists
            returned: always
            type: str
            sample: vpc-67236184
        available_ip_address_count:
            description: number of available IPv4 addresses
            returned: always
            type: str
            sample: 250
        vswitch_id:
            description: VSwitch resource id
            returned: always
            type: str
            sample: vsw-b883b2c4
        subnet_id:
            description: alias of vswitch_id
            returned: always
            type: str
            sample: vsw-b883b2c4
        vswitch_name:
            description: VSwitch resource name
            returned: always
            type: str
            sample: my-vsw
        creation_time:
            description: The time the VSwitch was created.
            returned: always
            type: str
            sample: '2018-06-24T15:14:45Z'
'''

import time
from ansible.module_utils.basic import AnsibleModule
from ansible_collections.alibaba.alicloud.plugins.module_utils.alicloud_ecs import ecs_argument_spec, vpc_connect

HAS_FOOTMARK = False

try:
    from footmark.exception import VPCResponseError
    HAS_FOOTMARK = True
except ImportError:
    HAS_FOOTMARK = False


def vswitch_exists(conn, module, vswitch_id, vpc_id, cidr):
    try:
        for vsw in conn.describe_vswitches():
            if cidr and vsw.cidr_block != cidr:
                continue
            if vpc_id and vpc_id != vsw.vpc_id:
                continue
            if vswitch_id and vswitch_id != vsw.vswitch_id:
                continue
            return vsw
    except Exception as e:
        module.fail_json(msg="Couldn't get matching subnet: {0}".format(e))


def main():
    argument_spec = ecs_argument_spec()
    argument_spec.update(dict(
        state=dict(default='present', choices=['present', 'absent']),
        cidr_block=dict(type='str', required=True),
        description=dict(type='str'),
        zone_id=dict(type='str', aliases=['availability_zone', 'alicloud_zone']),
        vpc_id=dict(type='str', required=True),
        name=dict(type='str', aliases=['vswitch_name', 'subnet_name']),
        vswitch_id=dict(type='str', aliases=['subnet_id', 'id']),
        tags=dict(type='dict'),
        purge_tags=dict(type='bool', default=False)
    ))

    module = AnsibleModule(argument_spec=argument_spec)

    if HAS_FOOTMARK is False:
        module.fail_json(msg='footmark required for the module ali_vswitch.')

    vpc = vpc_connect(module)

    # Get values of variable
    state = module.params['state']
    vswitch_id = module.params['vswitch_id']

    changed = False
    vswitch = vswitch_exists(vpc, module, vswitch_id,  module.params['vpc_id'], module.params['cidr_block'])

    if state == 'absent':
        if not vswitch:
            module.exit_json(changed=changed, vswitch={})
        try:
            changed = vswitch.delete()
            module.exit_json(changed=changed, vswitch={})
        except VPCResponseError as ex:
            module.fail_json(msg='Unable to delete vswitch: {0}, error: {1}'.format(vswitch.id, ex))

    vswitch_name = module.params['name']
    description = module.params['description']
    if str(description).startswith('http://') or str(description).startswith('https://'):
        module.fail_json(msg='description can not start with http:// or https://')

    if str(vswitch_name).startswith('http://') or str(vswitch_name).startswith('https://'):
        module.fail_json(msg='vswitch_name can not start with http:// or https://')

    if not vswitch:
        try:
            params = module.params
            params['client_token'] = "Ansible-Alicloud-{0}-{1}".format(hash(str(module.params)), str(time.time()))
            params['vswitch_name'] = vswitch_name
            vswitch = vpc.create_vswitch(**params)
            module.exit_json(changed=True, vswitch=vswitch.get().read())
        except VPCResponseError as e:
            module.fail_json(msg='Unable to create VSwitch, error: {0}'.format(e))

    if not vswitch_name:
        vswitch_name = vswitch.vswitch_name
    if not description:
        description = vswitch.description
    try:
        if vswitch.modify(name=vswitch_name, description=description):
            changed = True
    except VPCResponseError as e:
        module.fail_json(msg='Unable to modify vswitch attribute, error: {0}'.format(e))

    tags = module.params['tags']
    if module.params['purge_tags']:
        if not tags:
            tags = vswitch.tags
        try:
            if vswitch.remove_tags(tags):
                changed = True
            module.exit_json(changed=changed, vswitch=vswitch.get().read())
        except Exception as e:
            module.fail_json(msg="{0}".format(e))

    if tags:
        try:
            if vswitch.add_tags(tags):
                changed = True
        except Exception as e:
            module.fail_json(msg="{0}".format(e))
    module.exit_json(changed=changed, vswitch=vswitch.get().read())


if __name__ == '__main__':
    main()