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"""
Manage RabbitMQ Policies
========================

:maintainer:    Benn Eichhorn <benn@getlocalmeasure.com>
:maturity:      new
:platform:      all

Example:

.. code-block:: yaml

    rabbit_policy:
      rabbitmq_policy.present:
        - name: HA
        - pattern: '.*'
        - definition: '{"ha-mode": "all"}'
"""

import json
import logging

import salt.utils.path

log = logging.getLogger(__name__)


def __virtual__():
    """
    Only load if RabbitMQ is installed.
    """
    if salt.utils.path.which("rabbitmqctl"):
        return True
    return (False, "Command not found: rabbitmqctl")


def present(
    name, pattern, definition, priority=0, vhost="/", runas=None, apply_to=None
):
    """
    Ensure the RabbitMQ policy exists.

    Reference: https://rabbitmq.com/parameters.html#policies

    name
        Policy name
    pattern
        A regex of queues to apply the policy to
    definition
        A json dict describing the policy
    priority
        Priority (defaults to 0)
    vhost
        Virtual host to apply to (defaults to '/')
    runas
        Name of the user to run the command as
    apply_to
        Apply policy to 'queues', 'exchanges' or 'all' (default to 'all')
    """
    ret = {"name": name, "result": True, "comment": "", "changes": {}}
    result = {}

    policies = __salt__["rabbitmq.list_policies"](vhost=vhost, runas=runas)
    policy = policies.get(vhost, {}).get(name)
    updates = []
    if policy:
        if policy.get("pattern") != pattern:
            updates.append("Pattern")
        current_definition = policy.get("definition")
        current_definition = (
            json.loads(current_definition) if current_definition else ""
        )
        new_definition = json.loads(definition) if definition else ""
        if current_definition != new_definition:
            updates.append("Definition")
        if apply_to and (policy.get("apply-to") != apply_to):
            updates.append("Applyto")
        if int(policy.get("priority")) != priority:
            updates.append("Priority")

    if policy and not updates:
        ret["comment"] = f"Policy {vhost} {name} is already present"
        return ret

    if not policy:
        ret["changes"].update({"old": {}, "new": name})
        if __opts__["test"]:
            ret["comment"] = f"Policy {vhost} {name} is set to be created"
        else:
            log.debug("Policy doesn't exist - Creating")
            result = __salt__["rabbitmq.set_policy"](
                vhost,
                name,
                pattern,
                definition,
                priority=priority,
                runas=runas,
                apply_to=apply_to,
            )
    elif updates:
        ret["changes"].update({"old": policy, "new": updates})
        if __opts__["test"]:
            ret["comment"] = f"Policy {vhost} {name} is set to be updated"
        else:
            log.debug("Policy exists but needs updating")
            result = __salt__["rabbitmq.set_policy"](
                vhost,
                name,
                pattern,
                definition,
                priority=priority,
                runas=runas,
                apply_to=apply_to,
            )

    if "Error" in result:
        ret["result"] = False
        ret["comment"] = result["Error"]
    elif ret["changes"] == {}:
        ret["comment"] = f"'{name}' is already in the desired state."
    elif __opts__["test"]:
        ret["result"] = None
    elif "Set" in result:
        ret["comment"] = result["Set"]

    return ret


def absent(name, vhost="/", runas=None):
    """
    Ensure the named policy is absent

    Reference: http://www.rabbitmq.com/ha.html

    name
        The name of the policy to remove
    runas
        Name of the user to run the command as
    """
    ret = {"name": name, "result": True, "comment": "", "changes": {}}

    policy_exists = __salt__["rabbitmq.policy_exists"](vhost, name, runas=runas)

    if not policy_exists:
        ret["comment"] = f"Policy '{vhost} {name}' is not present."
        return ret

    if not __opts__["test"]:
        result = __salt__["rabbitmq.delete_policy"](vhost, name, runas=runas)
        if "Error" in result:
            ret["result"] = False
            ret["comment"] = result["Error"]
            return ret
        elif "Deleted" in result:
            ret["comment"] = "Deleted"

    # If we've reached this far before returning, we have changes.
    ret["changes"] = {"new": "", "old": name}

    if __opts__["test"]:
        ret["result"] = None
        ret["comment"] = f"Policy '{vhost} {name}' will be removed."

    return ret