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"""
StatusPage
==========

Manage the StatusPage_ configuration.

.. _StatusPage: https://www.statuspage.io/

In the minion configuration file, the following block is required:

.. code-block:: yaml

  statuspage:
    api_key: <API_KEY>
    page_id: <PAGE_ID>

.. versionadded:: 2017.7.0
"""

import logging
import time

# ----------------------------------------------------------------------------------------------------------------------
# module properties
# ----------------------------------------------------------------------------------------------------------------------

__virtualname__ = "statuspage"

log = logging.getLogger(__file__)

_DO_NOT_COMPARE_FIELDS = ["created_at", "updated_at"]

_MATCH_KEYS = ["id", "name"]

_PACE = 1  # 1 request per second

# ----------------------------------------------------------------------------------------------------------------------
# property functions
# ----------------------------------------------------------------------------------------------------------------------


def __virtual__():
    """
    Return the execution module virtualname.
    """
    if "statuspage.create" in __salt__:
        return True
    return (False, "statuspage module could not be loaded")


def _default_ret(name):
    """
    Default dictionary returned.
    """
    return {"name": name, "result": False, "comment": "", "changes": {}}


def _compute_diff_ret():
    """
    Default dictionary retuned by the _compute_diff helper.
    """
    return {"add": [], "update": [], "remove": []}


def _clear_dict(endpoint_props):
    """
    Eliminates None entries from the features of the endpoint dict.
    """
    return {
        prop_name: prop_val
        for prop_name, prop_val in endpoint_props.items()
        if prop_val is not None
    }


def _ignore_keys(endpoint_props):
    """
    Ignores some keys that might be different without any important info.
    These keys are defined under _DO_NOT_COMPARE_FIELDS.
    """
    return {
        prop_name: prop_val
        for prop_name, prop_val in endpoint_props.items()
        if prop_name not in _DO_NOT_COMPARE_FIELDS
    }


def _unique(list_of_dicts):
    """
    Returns an unique list of dictionaries given a list that may contain duplicates.
    """
    unique_list = []
    for ele in list_of_dicts:
        if ele not in unique_list:
            unique_list.append(ele)
    return unique_list


def _clear_ignore(endpoint_props):
    """
    Both _clear_dict and _ignore_keys in a single iteration.
    """
    return {
        prop_name: prop_val
        for prop_name, prop_val in endpoint_props.items()
        if prop_name not in _DO_NOT_COMPARE_FIELDS and prop_val is not None
    }


def _clear_ignore_list(lst):
    """
    Apply _clear_ignore to a list.
    """
    return _unique([_clear_ignore(ele) for ele in lst])


def _find_match(ele, lst):
    """
    Find a matching element in a list.
    """
    for _ele in lst:
        for match_key in _MATCH_KEYS:
            if _ele.get(match_key) == ele.get(match_key):
                return ele


def _update_on_fields(prev_ele, new_ele):
    """
    Return a dict with fields that differ between two dicts.
    """
    fields_update = {
        prop_name: prop_val
        for prop_name, prop_val in new_ele.items()
        if new_ele.get(prop_name) != prev_ele.get(prop_name) or prop_name in _MATCH_KEYS
    }
    if len(set(fields_update.keys()) | set(_MATCH_KEYS)) > len(set(_MATCH_KEYS)):
        if "id" not in fields_update:
            # in case of update, the ID is necessary
            # if not specified in the pillar,
            # will try to get it from the prev_ele
            fields_update["id"] = prev_ele["id"]
        return fields_update


def _compute_diff(expected_endpoints, configured_endpoints):
    """
    Compares configured endpoints with the expected configuration and returns the differences.
    """
    new_endpoints = []
    update_endpoints = []
    remove_endpoints = []

    ret = _compute_diff_ret()

    # noth configured => configure with expected endpoints
    if not configured_endpoints:
        ret.update({"add": expected_endpoints})
        return ret

    # noting expected => remove everything
    if not expected_endpoints:
        ret.update({"remove": configured_endpoints})
        return ret

    expected_endpoints_clear = _clear_ignore_list(expected_endpoints)
    configured_endpoints_clear = _clear_ignore_list(configured_endpoints)

    for expected_endpoint_clear in expected_endpoints_clear:
        if expected_endpoint_clear not in configured_endpoints_clear:
            # none equal => add or update
            matching_ele = _find_match(
                expected_endpoint_clear, configured_endpoints_clear
            )
            if not matching_ele:
                # new element => add
                new_endpoints.append(expected_endpoint_clear)
            else:
                # element matched, but some fields are different
                update_fields = _update_on_fields(matching_ele, expected_endpoint_clear)
                if update_fields:
                    update_endpoints.append(update_fields)
    for configured_endpoint_clear in configured_endpoints_clear:
        if configured_endpoint_clear not in expected_endpoints_clear:
            matching_ele = _find_match(
                configured_endpoint_clear, expected_endpoints_clear
            )
            if not matching_ele:
                #  no match found => remove
                remove_endpoints.append(configured_endpoint_clear)

    return {
        "add": new_endpoints,
        "update": update_endpoints,
        "remove": remove_endpoints,
    }


# ----------------------------------------------------------------------------------------------------------------------
# callable functions
# ----------------------------------------------------------------------------------------------------------------------


def create(
    name,
    endpoint="incidents",
    api_url=None,
    page_id=None,
    api_key=None,
    api_version=None,
    **kwargs,
):
    """
    Insert a new entry under a specific endpoint.

    endpoint: incidents
        Insert under this specific endpoint.

    page_id
        Page ID. Can also be specified in the config file.

    api_key
        API key. Can also be specified in the config file.

    api_version: 1
        API version. Can also be specified in the config file.

    api_url
        Custom API URL in case the user has a StatusPage service running in a custom environment.

    kwargs
        Other params.

    SLS Example:

    .. code-block:: yaml

        create-my-component:
            statuspage.create:
                - endpoint: components
                - name: my component
                - group_id: 993vgplshj12
    """
    ret = _default_ret(name)
    endpoint_sg = endpoint[:-1]  # singular
    if __opts__["test"]:
        ret["comment"] = "The following {endpoint} would be created:".format(
            endpoint=endpoint_sg
        )
        ret["result"] = None
        ret["changes"][endpoint] = {}
        for karg, warg in kwargs.items():
            if warg is None or karg.startswith("__"):
                continue
            ret["changes"][endpoint][karg] = warg
        return ret
    sp_create = __salt__["statuspage.create"](
        endpoint=endpoint,
        api_url=api_url,
        page_id=page_id,
        api_key=api_key,
        api_version=api_version,
        **kwargs,
    )
    if not sp_create.get("result"):
        ret["comment"] = "Unable to create {endpoint}: {msg}".format(
            endpoint=endpoint_sg, msg=sp_create.get("comment")
        )
    else:
        ret["comment"] = f"{endpoint_sg} created!"
        ret["result"] = True
        ret["changes"] = sp_create.get("out")


def update(
    name,
    endpoint="incidents",
    id=None,
    api_url=None,
    page_id=None,
    api_key=None,
    api_version=None,
    **kwargs,
):
    """
    Update attribute(s) of a specific endpoint.

    id
        The unique ID of the endpoint entry.

    endpoint: incidents
        Endpoint name.

    page_id
        Page ID. Can also be specified in the config file.

    api_key
        API key. Can also be specified in the config file.

    api_version: 1
        API version. Can also be specified in the config file.

    api_url
        Custom API URL in case the user has a StatusPage service running in a custom environment.

    SLS Example:

    .. code-block:: yaml

        update-my-incident:
            statuspage.update:
                - id: dz959yz2nd4l
                - status: resolved
    """
    ret = _default_ret(name)
    endpoint_sg = endpoint[:-1]  # singular
    if not id:
        log.error("Invalid %s ID", endpoint_sg)
        ret["comment"] = "Please specify a valid {endpoint} ID".format(
            endpoint=endpoint_sg
        )
        return ret
    if __opts__["test"]:
        ret["comment"] = "{endpoint} #{id} would be updated:".format(
            endpoint=endpoint_sg, id=id
        )
        ret["result"] = None
        ret["changes"][endpoint] = {}
        for karg, warg in kwargs.items():
            if warg is None or karg.startswith("__"):
                continue
            ret["changes"][endpoint][karg] = warg
        return ret
    sp_update = __salt__["statuspage.update"](
        endpoint=endpoint,
        id=id,
        api_url=api_url,
        page_id=page_id,
        api_key=api_key,
        api_version=api_version,
        **kwargs,
    )
    if not sp_update.get("result"):
        ret["comment"] = "Unable to update {endpoint} #{id}: {msg}".format(
            endpoint=endpoint_sg, id=id, msg=sp_update.get("comment")
        )
    else:
        ret["comment"] = f"{endpoint_sg} #{id} updated!"
        ret["result"] = True
        ret["changes"] = sp_update.get("out")


def delete(
    name,
    endpoint="incidents",
    id=None,
    api_url=None,
    page_id=None,
    api_key=None,
    api_version=None,
):
    """
    Remove an entry from an endpoint.

    endpoint: incidents
        Request a specific endpoint.

    page_id
        Page ID. Can also be specified in the config file.

    api_key
        API key. Can also be specified in the config file.

    api_version: 1
        API version. Can also be specified in the config file.

    api_url
        Custom API URL in case the user has a StatusPage service running in a custom environment.

    SLS Example:

    .. code-block:: yaml

        delete-my-component:
            statuspage.delete:
                - endpoint: components
                - id: ftgks51sfs2d
    """
    ret = _default_ret(name)
    endpoint_sg = endpoint[:-1]  # singular
    if not id:
        log.error("Invalid %s ID", endpoint_sg)
        ret["comment"] = "Please specify a valid {endpoint} ID".format(
            endpoint=endpoint_sg
        )
        return ret
    if __opts__["test"]:
        ret["comment"] = "{endpoint} #{id} would be removed!".format(
            endpoint=endpoint_sg, id=id
        )
        ret["result"] = None
    sp_delete = __salt__["statuspage.delete"](
        endpoint=endpoint,
        id=id,
        api_url=api_url,
        page_id=page_id,
        api_key=api_key,
        api_version=api_version,
    )
    if not sp_delete.get("result"):
        ret["comment"] = "Unable to delete {endpoint} #{id}: {msg}".format(
            endpoint=endpoint_sg, id=id, msg=sp_delete.get("comment")
        )
    else:
        ret["comment"] = f"{endpoint_sg} #{id} deleted!"
        ret["result"] = True


def managed(
    name,
    config,
    api_url=None,
    page_id=None,
    api_key=None,
    api_version=None,
    pace=_PACE,
    allow_empty=False,
):
    """
    Manage the StatusPage configuration.

    config
        Dictionary with the expected configuration of the StatusPage.
        The main level keys of this dictionary represent the endpoint name.
        If a certain endpoint does not exist in this structure, it will be ignored / not configured.

    page_id
        Page ID. Can also be specified in the config file.

    api_key
        API key. Can also be specified in the config file.

    api_version: 1
        API version. Can also be specified in the config file.

    api_url
        Custom API URL in case the user has a StatusPage service running in a custom environment.

    pace: 1
        Max requests per second allowed by the API.

    allow_empty: False
        Allow empty config.

    SLS example:

    .. code-block:: yaml

        my-statuspage-config:
            statuspage.managed:
                - config:
                    components:
                        - name: component1
                          group_id: uy4g37rf
                        - name: component2
                          group_id: 3n4uyu4gf
                    incidents:
                        - name: incident1
                          status: resolved
                          impact: major
                          backfilled: false
                        - name: incident2
                          status: investigating
                          impact: minor
    """
    complete_diff = {}
    ret = _default_ret(name)
    if not config and not allow_empty:
        ret.update(
            {
                "result": False,
                "comment": (
                    "Cannot remove everything. To allow this, please set the option"
                    " `allow_empty` as True."
                ),
            }
        )
        return ret
    is_empty = True
    for endpoint_name, endpoint_expected_config in config.items():
        if endpoint_expected_config:
            is_empty = False
        endpoint_existing_config_ret = __salt__["statuspage.retrieve"](
            endpoint=endpoint_name,
            api_url=api_url,
            page_id=page_id,
            api_key=api_key,
            api_version=api_version,
        )
        if not endpoint_existing_config_ret.get("result"):
            ret.update({"comment": endpoint_existing_config_ret.get("comment")})
            return ret  # stop at first error
        endpoint_existing_config = endpoint_existing_config_ret.get("out")
        complete_diff[endpoint_name] = _compute_diff(
            endpoint_expected_config, endpoint_existing_config
        )
    if is_empty and not allow_empty:
        ret.update(
            {
                "result": False,
                "comment": (
                    "Cannot remove everything. To allow this, please set the option"
                    " `allow_empty` as True."
                ),
            }
        )
        return ret
    any_changes = False
    for endpoint_name, endpoint_diff in complete_diff.items():
        if (
            endpoint_diff.get("add")
            or endpoint_diff.get("update")
            or endpoint_diff.get("remove")
        ):
            any_changes = True
    if not any_changes:
        ret.update({"result": True, "comment": "No changes required.", "changes": {}})
        return ret
    ret.update({"changes": complete_diff})
    if __opts__.get("test"):
        ret.update(
            {
                "comment": "Testing mode. Would apply the following changes:",
                "result": None,
            }
        )
        return ret
    for endpoint_name, endpoint_diff in complete_diff.items():
        endpoint_sg = endpoint_name[:-1]  # singular
        for new_endpoint in endpoint_diff.get("add"):
            log.debug("Defining new %s %s", endpoint_sg, new_endpoint)
            adding = __salt__["statuspage.create"](
                endpoint=endpoint_name,
                api_url=api_url,
                page_id=page_id,
                api_key=api_key,
                api_version=api_version,
                **new_endpoint,
            )
            if not adding.get("result"):
                ret.update({"comment": adding.get("comment")})
                return ret
            if pace:
                time.sleep(1 / pace)
        for update_endpoint in endpoint_diff.get("update"):
            if "id" not in update_endpoint:
                continue
            endpoint_id = update_endpoint.pop("id")
            log.debug("Updating %s #%s: %s", endpoint_sg, endpoint_id, update_endpoint)
            updating = __salt__["statuspage.update"](
                endpoint=endpoint_name,
                id=endpoint_id,
                api_url=api_url,
                page_id=page_id,
                api_key=api_key,
                api_version=api_version,
                **update_endpoint,
            )
            if not updating.get("result"):
                ret.update({"comment": updating.get("comment")})
                return ret
            if pace:
                time.sleep(1 / pace)
        for remove_endpoint in endpoint_diff.get("remove"):
            if "id" not in remove_endpoint:
                continue
            endpoint_id = remove_endpoint.pop("id")
            log.debug("Removing %s #%s", endpoint_sg, endpoint_id)
            removing = __salt__["statuspage.delete"](
                endpoint=endpoint_name,
                id=endpoint_id,
                api_url=api_url,
                page_id=page_id,
                api_key=api_key,
                api_version=api_version,
            )
            if not removing.get("result"):
                ret.update({"comment": removing.get("comment")})
                return ret
            if pace:
                time.sleep(1 / pace)
    ret.update({"result": True, "comment": "StatusPage updated."})
    return ret