#!/usr/bin/python

# Copyright Ansible Project
# GNU General Public License v3.0+ (see LICENSES/GPL-3.0-or-later.txt or https://www.gnu.org/licenses/gpl-3.0.txt)
# SPDX-License-Identifier: GPL-3.0-or-later

from __future__ import annotations

DOCUMENTATION = r"""
module: ovh_ip_loadbalancing_backend
short_description: Manage OVH IP LoadBalancing backends
description:
  - Manage OVH (French European hosting provider) LoadBalancing IP backends.
author: Pascal Heraud (@pascalheraud)
notes:
  - Uses the Python OVH API U(https://github.com/ovh/python-ovh). You have to create an application (a key and secret) with
    a consumer key as described into U(https://docs.ovh.com/gb/en/customer/first-steps-with-ovh-api/).
requirements:
  - ovh > 0.3.5
extends_documentation_fragment:
  - community.general.attributes
attributes:
  check_mode:
    support: none
  diff_mode:
    support: none
options:
  name:
    required: true
    description:
      - Name of the LoadBalancing internal name (V(ip-X.X.X.X)).
    type: str
  backend:
    required: true
    description:
      - The IP address of the backend to update / modify / delete.
    type: str
  state:
    default: present
    choices: ['present', 'absent']
    description:
      - Determines whether the backend is to be created/modified or deleted.
    type: str
  probe:
    default: 'none'
    choices: ['none', 'http', 'icmp', 'oco']
    description:
      - Determines the type of probe to use for this backend.
    type: str
  weight:
    default: 8
    description:
      - Determines the weight for this backend.
    type: int
  endpoint:
    required: true
    description:
      - The endpoint to use (for instance V(ovh-eu)).
    type: str
  application_key:
    required: true
    description:
      - The applicationKey to use.
    type: str
  application_secret:
    required: true
    description:
      - The application secret to use.
    type: str
  consumer_key:
    required: true
    description:
      - The consumer key to use.
    type: str
  timeout:
    default: 120
    description:
      - The timeout in seconds used to wait for a task to be completed.
    type: int
"""

EXAMPLES = r"""
- name: Adds or modify the backend '212.1.1.1' to a loadbalancing 'ip-1.1.1.1'
  ovh_ip_loadbalancing:
    name: ip-1.1.1.1
    backend: 212.1.1.1
    state: present
    probe: none
    weight: 8
    endpoint: ovh-eu
    application_key: yourkey
    application_secret: yoursecret
    consumer_key: yourconsumerkey

- name: Removes a backend '212.1.1.1' from a loadbalancing 'ip-1.1.1.1'
  ovh_ip_loadbalancing:
    name: ip-1.1.1.1
    backend: 212.1.1.1
    state: absent
    endpoint: ovh-eu
    application_key: yourkey
    application_secret: yoursecret
    consumer_key: yourconsumerkey
"""

import time

try:
    import ovh
    import ovh.exceptions
    from ovh.exceptions import APIError

    HAS_OVH = True
except ImportError:
    HAS_OVH = False

from ansible.module_utils.basic import AnsibleModule


def getOvhClient(ansibleModule):
    endpoint = ansibleModule.params.get("endpoint")
    application_key = ansibleModule.params.get("application_key")
    application_secret = ansibleModule.params.get("application_secret")
    consumer_key = ansibleModule.params.get("consumer_key")

    return ovh.Client(
        endpoint=endpoint,
        application_key=application_key,
        application_secret=application_secret,
        consumer_key=consumer_key,
    )


def waitForNoTask(client, name, timeout):
    currentTimeout = timeout
    while len(client.get(f"/ip/loadBalancing/{name}/task")) > 0:
        time.sleep(1)  # Delay for 1 sec
        currentTimeout -= 1
        if currentTimeout < 0:
            return False
    return True


def main():
    module = AnsibleModule(
        argument_spec=dict(
            name=dict(required=True),
            backend=dict(required=True),
            weight=dict(default=8, type="int"),
            probe=dict(default="none", choices=["none", "http", "icmp", "oco"]),
            state=dict(default="present", choices=["present", "absent"]),
            endpoint=dict(required=True),
            application_key=dict(required=True, no_log=True),
            application_secret=dict(required=True, no_log=True),
            consumer_key=dict(required=True, no_log=True),
            timeout=dict(default=120, type="int"),
        )
    )

    if not HAS_OVH:
        module.fail_json(msg="ovh-api python module is required to run this module")

    # Get parameters
    name = module.params.get("name")
    state = module.params.get("state")
    backend = module.params.get("backend")
    weight = module.params.get("weight")
    probe = module.params.get("probe")
    timeout = module.params.get("timeout")

    # Connect to OVH API
    client = getOvhClient(module)

    # Check that the load balancing exists
    try:
        loadBalancings = client.get("/ip/loadBalancing")
    except APIError as apiError:
        module.fail_json(
            msg=f"Unable to call OVH API for getting the list of loadBalancing, check application key, secret, consumerkey and parameters. "
            f"Error returned by OVH API was : {apiError}"
        )

    if name not in loadBalancings:
        module.fail_json(msg=f"IP LoadBalancing {name} does not exist")

    # Check that no task is pending before going on
    try:
        if not waitForNoTask(client, name, timeout):
            module.fail_json(
                msg=f"Timeout of {timeout} seconds while waiting for no pending tasks before executing the module "
            )
    except APIError as apiError:
        module.fail_json(
            msg=f"Unable to call OVH API for getting the list of pending tasks of the loadBalancing, check application key, secret, consumerkey and "
            f"parameters. Error returned by OVH API was : {apiError}"
        )

    try:
        backends = client.get(f"/ip/loadBalancing/{name}/backend")
    except APIError as apiError:
        module.fail_json(
            msg=(
                "Unable to call OVH API for getting the list of backends "
                "of the loadBalancing, check application key, secret, consumerkey "
                f"and parameters. Error returned by OVH API was : {apiError}"
            )
        )

    backendExists = backend in backends
    moduleChanged = False
    if state == "absent":
        if backendExists:
            # Remove backend
            try:
                client.delete(f"/ip/loadBalancing/{name}/backend/{backend}")
                if not waitForNoTask(client, name, timeout):
                    module.fail_json(
                        msg=f"Timeout of {timeout} seconds while waiting for completion of removing backend task"
                    )
            except APIError as apiError:
                module.fail_json(
                    msg=f"Unable to call OVH API for deleting the backend, check application key, secret, consumerkey and parameters. "
                    f"Error returned by OVH API was : {apiError}"
                )
            moduleChanged = True
    else:
        if backendExists:
            # Get properties
            try:
                backendProperties = client.get(f"/ip/loadBalancing/{name}/backend/{backend}")
            except APIError as apiError:
                module.fail_json(
                    msg=f"Unable to call OVH API for getting the backend properties, check application key, secret, consumerkey and parameters. "
                    f"Error returned by OVH API was : {apiError}"
                )

            if backendProperties["weight"] != weight:
                # Change weight
                try:
                    client.post(f"/ip/loadBalancing/{name}/backend/{backend}/setWeight", weight=weight)
                    if not waitForNoTask(client, name, timeout):
                        module.fail_json(
                            msg=f"Timeout of {timeout} seconds while waiting for completion of setWeight to backend task"
                        )
                except APIError as apiError:
                    module.fail_json(
                        msg=f"Unable to call OVH API for updating the weight of the backend, check application key, secret, consumerkey and parameters. "
                        f"Error returned by OVH API was : {apiError}"
                    )
                moduleChanged = True

            if backendProperties["probe"] != probe:
                # Change probe
                backendProperties["probe"] = probe
                try:
                    client.put(f"/ip/loadBalancing/{name}/backend/{backend}", probe=probe)
                    if not waitForNoTask(client, name, timeout):
                        module.fail_json(
                            msg=f"Timeout of {timeout} seconds while waiting for completion of setProbe to backend task"
                        )
                except APIError as apiError:
                    module.fail_json(
                        msg=f"Unable to call OVH API for updating the probe of the backend, check application key, secret, consumerkey and parameters. "
                        f"Error returned by OVH API was : {apiError}"
                    )
                moduleChanged = True

        else:
            # Creates backend
            try:
                try:
                    client.post(f"/ip/loadBalancing/{name}/backend", ipBackend=backend, probe=probe, weight=weight)
                except APIError as apiError:
                    module.fail_json(
                        msg=f"Unable to call OVH API for creating the backend, check application key, secret, consumerkey and parameters. "
                        f"Error returned by OVH API was : {apiError}"
                    )

                if not waitForNoTask(client, name, timeout):
                    module.fail_json(
                        msg=f"Timeout of {timeout} seconds while waiting for completion of backend creation task"
                    )
            except APIError as apiError:
                module.fail_json(
                    msg=f"Unable to call OVH API for creating the backend, check application key, secret, consumerkey and parameters. "
                    f"Error returned by OVH API was : {apiError}"
                )
            moduleChanged = True

    module.exit_json(changed=moduleChanged)


if __name__ == "__main__":
    main()