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"""
State module to manage Elasticsearch.

.. versionadded:: 2017.7.0
"""

import logging

import salt.utils.json

log = logging.getLogger(__name__)


def index_absent(name):
    """
    Ensure that the named index is absent.

    name
        Name of the index to remove
    """

    ret = {"name": name, "changes": {}, "result": True, "comment": ""}

    try:
        index = __salt__["elasticsearch.index_get"](index=name)
        if index and name in index:
            if __opts__["test"]:
                ret["comment"] = f"Index {name} will be removed"
                ret["changes"]["old"] = index[name]
                ret["result"] = None
            else:
                ret["result"] = __salt__["elasticsearch.index_delete"](index=name)
                if ret["result"]:
                    ret["comment"] = f"Successfully removed index {name}"
                    ret["changes"]["old"] = index[name]
                else:
                    ret["comment"] = (
                        f"Failed to remove index {name} for unknown reasons"
                    )
        else:
            ret["comment"] = f"Index {name} is already absent"
    except Exception as err:  # pylint: disable=broad-except
        ret["result"] = False
        ret["comment"] = str(err)

    return ret


def index_present(name, definition=None):
    """
    Ensure that the named index is present.

    name
        Name of the index to add
    definition
        Optional dict for creation parameters as per https://www.elastic.co/guide/en/elasticsearch/reference/current/indices-create-index.html

    **Example:**

    .. code-block:: yaml

        # Default settings
        mytestindex:
          elasticsearch_index.present

        # Extra settings
        mytestindex2:
          elasticsearch_index.present:
            - definition:
                settings:
                  index:
                    number_of_shards: 10
    """

    ret = {"name": name, "changes": {}, "result": True, "comment": ""}

    try:
        index_exists = __salt__["elasticsearch.index_exists"](index=name)
        if not index_exists:
            if __opts__["test"]:
                ret["comment"] = "Index {} does not exist and will be created".format(
                    name
                )
                ret["changes"] = {"new": definition}
                ret["result"] = None
            else:
                output = __salt__["elasticsearch.index_create"](
                    index=name, body=definition
                )
                if output:
                    ret["comment"] = f"Successfully created index {name}"
                    ret["changes"] = {
                        "new": __salt__["elasticsearch.index_get"](index=name)[name]
                    }
                else:
                    ret["result"] = False
                    ret["comment"] = f"Cannot create index {name}, {output}"
        else:
            ret["comment"] = f"Index {name} is already present"
    except Exception as err:  # pylint: disable=broad-except
        ret["result"] = False
        ret["comment"] = str(err)

    return ret


def alias_absent(name, index):
    """
    Ensure that the index alias is absent.

    name
        Name of the index alias to remove
    index
        Name of the index for the alias
    """

    ret = {"name": name, "changes": {}, "result": True, "comment": ""}

    try:
        alias = __salt__["elasticsearch.alias_get"](aliases=name, indices=index)
        if (
            alias
            and alias.get(index, {}).get("aliases", {}).get(name, None) is not None
        ):
            if __opts__["test"]:
                ret["comment"] = "Alias {} for index {} will be removed".format(
                    name, index
                )
                ret["changes"]["old"] = (
                    alias.get(index, {}).get("aliases", {}).get(name, {})
                )
                ret["result"] = None
            else:
                ret["result"] = __salt__["elasticsearch.alias_delete"](
                    aliases=name, indices=index
                )
                if ret["result"]:
                    ret["comment"] = (
                        f"Successfully removed alias {name} for index {index}"
                    )
                    ret["changes"]["old"] = (
                        alias.get(index, {}).get("aliases", {}).get(name, {})
                    )
                else:
                    ret["comment"] = (
                        "Failed to remove alias {} for index {} for unknown reasons".format(
                            name, index
                        )
                    )
        else:
            ret["comment"] = "Alias {} for index {} is already absent".format(
                name, index
            )
    except Exception as err:  # pylint: disable=broad-except
        ret["result"] = False
        ret["comment"] = str(err)

    return ret


def alias_present(name, index, definition=None):
    """
    Ensure that the named index alias is present.

    name
        Name of the alias
    index
        Name of the index
    definition
        Optional dict for filters as per https://www.elastic.co/guide/en/elasticsearch/reference/current/indices-aliases.html

    **Example:**

    .. code-block:: yaml

        mytestalias:
          elasticsearch.alias_present:
            - index: testindex
            - definition:
                filter:
                  term:
                    user: kimchy
    """

    ret = {"name": name, "changes": {}, "result": True, "comment": ""}

    try:
        alias = __salt__["elasticsearch.alias_get"](aliases=name, indices=index)
        old = {}
        if alias:
            old = alias.get(index, {}).get("aliases", {}).get(name, {})
        if not definition:
            definition = {}

        ret["changes"] = __utils__["dictdiffer.deep_diff"](old, definition)

        if ret["changes"] or not definition:
            if __opts__["test"]:
                if not old:
                    ret["comment"] = (
                        "Alias {} for index {} does not exist and will be created".format(
                            name, index
                        )
                    )
                else:
                    ret["comment"] = (
                        "Alias {} for index {} exists with wrong configuration and will"
                        " be overridden".format(name, index)
                    )

                ret["result"] = None
            else:
                output = __salt__["elasticsearch.alias_create"](
                    alias=name, indices=index, body=definition
                )
                if output:
                    if not old:
                        ret["comment"] = (
                            "Successfully created alias {} for index {}".format(
                                name, index
                            )
                        )
                    else:
                        ret["comment"] = (
                            "Successfully replaced alias {} for index {}".format(
                                name, index
                            )
                        )
                else:
                    ret["result"] = False
                    ret["comment"] = "Cannot create alias {} for index {}, {}".format(
                        name, index, output
                    )
        else:
            ret["comment"] = "Alias {} for index {} is already present".format(
                name, index
            )
    except Exception as err:  # pylint: disable=broad-except
        ret["result"] = False
        ret["comment"] = str(err)

    return ret


def index_template_absent(name):
    """
    Ensure that the named index template is absent.

    name
        Name of the index to remove
    """

    ret = {"name": name, "changes": {}, "result": True, "comment": ""}

    try:
        index_template = __salt__["elasticsearch.index_template_get"](name=name)
        if index_template and name in index_template:
            if __opts__["test"]:
                ret["comment"] = f"Index template {name} will be removed"
                ret["changes"]["old"] = index_template[name]
                ret["result"] = None
            else:
                ret["result"] = __salt__["elasticsearch.index_template_delete"](
                    name=name
                )
                if ret["result"]:
                    ret["comment"] = "Successfully removed index template {}".format(
                        name
                    )
                    ret["changes"]["old"] = index_template[name]
                else:
                    ret["comment"] = (
                        "Failed to remove index template {} for unknown reasons".format(
                            name
                        )
                    )
        else:
            ret["comment"] = f"Index template {name} is already absent"
    except Exception as err:  # pylint: disable=broad-except
        ret["result"] = False
        ret["comment"] = str(err)

    return ret


def index_template_present(name, definition, check_definition=False):
    """
    Ensure that the named index template is present.

    name
        Name of the index to add
    definition
        Required dict for creation parameters as per https://www.elastic.co/guide/en/elasticsearch/reference/current/indices-templates.html
    check_definition
        If the template already exists and the definition is up to date

    **Example:**

    .. code-block:: yaml

        mytestindex2_template:
          elasticsearch.index_template_present:
            - definition:
                template: logstash-*
                order: 1
                settings:
                  number_of_shards: 1
    """

    ret = {"name": name, "changes": {}, "result": True, "comment": ""}

    try:
        index_template_exists = __salt__["elasticsearch.index_template_exists"](
            name=name
        )
        if not index_template_exists:
            if __opts__["test"]:
                ret["comment"] = (
                    f"Index template {name} does not exist and will be created"
                )
                ret["changes"] = {"new": definition}
                ret["result"] = None
            else:
                output = __salt__["elasticsearch.index_template_create"](
                    name=name, body=definition
                )
                if output:
                    ret["comment"] = "Successfully created index template {}".format(
                        name
                    )
                    ret["changes"] = {
                        "new": __salt__["elasticsearch.index_template_get"](name=name)[
                            name
                        ]
                    }
                else:
                    ret["result"] = False
                    ret["comment"] = "Cannot create index template {}, {}".format(
                        name, output
                    )
        else:
            if check_definition:
                if isinstance(definition, str):
                    definition_parsed = salt.utils.json.loads(definition)
                else:
                    definition_parsed = definition
                current_template = __salt__["elasticsearch.index_template_get"](
                    name=name
                )[name]
                # Prune empty keys (avoid false positive diff)
                for key in ("mappings", "aliases", "settings"):
                    if current_template[key] == {} and key not in definition_parsed:
                        del current_template[key]
                diff = __utils__["dictdiffer.deep_diff"](
                    current_template, definition_parsed
                )
                if len(diff) != 0:
                    if __opts__["test"]:
                        ret["comment"] = (
                            "Index template {} exist but need to be updated".format(
                                name
                            )
                        )
                        ret["changes"] = diff
                        ret["result"] = None
                    else:
                        output = __salt__["elasticsearch.index_template_create"](
                            name=name, body=definition
                        )
                        if output:
                            ret["comment"] = (
                                f"Successfully updated index template {name}"
                            )
                            ret["changes"] = diff
                        else:
                            ret["result"] = False
                            ret["comment"] = (
                                "Cannot update index template {}, {}".format(
                                    name, output
                                )
                            )
                else:
                    ret["comment"] = (
                        "Index template {} is already present and up to date".format(
                            name
                        )
                    )
            else:
                ret["comment"] = f"Index template {name} is already present"
    except Exception as err:  # pylint: disable=broad-except
        ret["result"] = False
        ret["comment"] = str(err)

    return ret


def pipeline_absent(name):
    """
    Ensure that the named pipeline is absent

    name
        Name of the pipeline to remove
    """

    ret = {"name": name, "changes": {}, "result": True, "comment": ""}

    try:
        pipeline = __salt__["elasticsearch.pipeline_get"](id=name)
        if pipeline and name in pipeline:
            if __opts__["test"]:
                ret["comment"] = f"Pipeline {name} will be removed"
                ret["changes"]["old"] = pipeline[name]
                ret["result"] = None
            else:
                ret["result"] = __salt__["elasticsearch.pipeline_delete"](id=name)
                if ret["result"]:
                    ret["comment"] = f"Successfully removed pipeline {name}"
                    ret["changes"]["old"] = pipeline[name]
                else:
                    ret["comment"] = (
                        f"Failed to remove pipeline {name} for unknown reasons"
                    )
        else:
            ret["comment"] = f"Pipeline {name} is already absent"
    except Exception as err:  # pylint: disable=broad-except
        ret["result"] = False
        ret["comment"] = str(err)

    return ret


def pipeline_present(name, definition):
    """
    Ensure that the named pipeline is present.

    name
        Name of the index to add
    definition
        Required dict for creation parameters as per https://www.elastic.co/guide/en/elasticsearch/reference/master/pipeline.html

    **Example:**

    .. code-block:: yaml

        test_pipeline:
          elasticsearch.pipeline_present:
            - definition:
                description: example pipeline
                processors:
                  - set:
                      field: collector_timestamp_millis
                      value: '{{ '{{' }}_ingest.timestamp{{ '}}' }}'
    """

    ret = {"name": name, "changes": {}, "result": True, "comment": ""}

    try:
        pipeline = __salt__["elasticsearch.pipeline_get"](id=name)
        old = {}
        if pipeline and name in pipeline:
            old = pipeline[name]
        ret["changes"] = __utils__["dictdiffer.deep_diff"](old, definition)

        if ret["changes"] or not definition:
            if __opts__["test"]:
                if not pipeline:
                    ret["comment"] = (
                        f"Pipeline {name} does not exist and will be created"
                    )
                else:
                    ret["comment"] = (
                        "Pipeline {} exists with wrong configuration and will be"
                        " overridden".format(name)
                    )

                ret["result"] = None
            else:
                output = __salt__["elasticsearch.pipeline_create"](
                    id=name, body=definition
                )
                if output:
                    if not pipeline:
                        ret["comment"] = f"Successfully created pipeline {name}"
                    else:
                        ret["comment"] = "Successfully replaced pipeline {}".format(
                            name
                        )
                else:
                    ret["result"] = False
                    ret["comment"] = "Cannot create pipeline {}, {}".format(
                        name, output
                    )
        else:
            ret["comment"] = f"Pipeline {name} is already present"
    except Exception as err:  # pylint: disable=broad-except
        ret["result"] = False
        ret["comment"] = str(err)

    return ret


def search_template_absent(name):
    """
    Ensure that the search template is absent

    name
        Name of the search template to remove
    """

    ret = {"name": name, "changes": {}, "result": True, "comment": ""}

    try:
        template = __salt__["elasticsearch.search_template_get"](id=name)
        if template:
            if __opts__["test"]:
                ret["comment"] = f"Search template {name} will be removed"
                ret["changes"]["old"] = salt.utils.json.loads(template["template"])
                ret["result"] = None
            else:
                ret["result"] = __salt__["elasticsearch.search_template_delete"](
                    id=name
                )
                if ret["result"]:
                    ret["comment"] = "Successfully removed search template {}".format(
                        name
                    )
                    ret["changes"]["old"] = salt.utils.json.loads(template["template"])
                else:
                    ret["comment"] = (
                        "Failed to remove search template {} for unknown reasons".format(
                            name
                        )
                    )
        else:
            ret["comment"] = f"Search template {name} is already absent"
    except Exception as err:  # pylint: disable=broad-except
        ret["result"] = False
        ret["comment"] = str(err)

    return ret


def search_template_present(name, definition):
    """
    Ensure that the named search template is present.

    name
        Name of the search template to add
    definition
        Required dict for creation parameters as per http://www.elastic.co/guide/en/elasticsearch/reference/current/search-template.html

    **Example:**

    .. code-block:: yaml

        test_pipeline:
          elasticsearch.search_template_present:
            - definition:
                inline:
                  size: 10
    """

    ret = {"name": name, "changes": {}, "result": True, "comment": ""}

    try:
        template = __salt__["elasticsearch.search_template_get"](id=name)

        old = {}
        if template:
            old = salt.utils.json.loads(template["template"])

        ret["changes"] = __utils__["dictdiffer.deep_diff"](old, definition)

        if ret["changes"] or not definition:
            if __opts__["test"]:
                if not template:
                    ret["comment"] = (
                        "Search template {} does not exist and will be created".format(
                            name
                        )
                    )
                else:
                    ret["comment"] = (
                        "Search template {} exists with wrong configuration and will be"
                        " overridden".format(name)
                    )

                ret["result"] = None
            else:
                output = __salt__["elasticsearch.search_template_create"](
                    id=name, body=definition
                )
                if output:
                    if not template:
                        ret["comment"] = f"Successfully created search template {name}"
                    else:
                        ret["comment"] = f"Successfully replaced search template {name}"
                else:
                    ret["result"] = False
                    ret["comment"] = "Cannot create search template {}, {}".format(
                        name, output
                    )
        else:
            ret["comment"] = f"Search template {name} is already present"
    except Exception as err:  # pylint: disable=broad-except
        ret["result"] = False
        ret["comment"] = str(err)

    return ret