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"""
Manage Grafana v2.0 data sources

.. versionadded:: 2016.3.0

.. code-block:: yaml

    grafana:
      grafana_timeout: 3
      grafana_token: qwertyuiop
      grafana_url: 'https://url.com'

.. code-block:: yaml

    Ensure influxdb data source is present:
      grafana_datasource.present:
        - name: influxdb
        - type: influxdb
        - url: http://localhost:8086
        - access: proxy
        - basic_auth: true
        - basic_auth_user: myuser
        - basic_auth_password: mypass
        - is_default: true
"""

import requests


def __virtual__():
    """Only load if grafana v2.0 is configured."""
    if __salt__["config.get"]("grafana_version", 1) == 2:
        return True
    return (False, "Not configured for grafana_version 2")


def present(
    name,
    type,
    url,
    access="proxy",
    user="",
    password="",
    database="",
    basic_auth=False,
    basic_auth_user="",
    basic_auth_password="",
    is_default=False,
    json_data=None,
    profile="grafana",
):
    """
    Ensure that a data source is present.

    name
        Name of the data source.

    type
        Which type of data source it is ('graphite', 'influxdb' etc.).

    url
        The URL to the data source API.

    user
        Optional - user to authenticate with the data source

    password
        Optional - password to authenticate with the data source

    basic_auth
        Optional - set to True to use HTTP basic auth to authenticate with the
        data source.

    basic_auth_user
        Optional - HTTP basic auth username.

    basic_auth_password
        Optional - HTTP basic auth password.

    is_default
        Default: False
    """
    if isinstance(profile, str):
        profile = __salt__["config.option"](profile)

    ret = {"name": name, "result": None, "comment": None, "changes": {}}
    datasource = _get_datasource(profile, name)
    data = _get_json_data(
        name,
        type,
        url,
        access,
        user,
        password,
        database,
        basic_auth,
        basic_auth_user,
        basic_auth_password,
        is_default,
        json_data,
    )

    if datasource:
        requests.put(
            _get_url(profile, datasource["id"]),
            data,
            headers=_get_headers(profile),
            timeout=profile.get("grafana_timeout", 3),
        )
        ret["result"] = True
        ret["changes"] = _diff(datasource, data)
        if ret["changes"]["new"] or ret["changes"]["old"]:
            ret["comment"] = f"Data source {name} updated"
        else:
            ret["changes"] = {}
            ret["comment"] = f"Data source {name} already up-to-date"
    else:
        requests.post(
            "{}/api/datasources".format(profile["grafana_url"]),
            data,
            headers=_get_headers(profile),
            timeout=profile.get("grafana_timeout", 3),
        )
        ret["result"] = True
        ret["comment"] = f"New data source {name} added"
        ret["changes"] = data

    return ret


def absent(name, profile="grafana"):
    """
    Ensure that a data source is present.

    name
        Name of the data source to remove.
    """
    if isinstance(profile, str):
        profile = __salt__["config.option"](profile)

    ret = {"result": None, "comment": None, "changes": {}}
    datasource = _get_datasource(profile, name)

    if not datasource:
        ret["result"] = True
        ret["comment"] = f"Data source {name} already absent"
        return ret

    requests.delete(
        _get_url(profile, datasource["id"]),
        headers=_get_headers(profile),
        timeout=profile.get("grafana_timeout", 3),
    )

    ret["result"] = True
    ret["comment"] = f"Data source {name} was deleted"

    return ret


def _get_url(profile, datasource_id):
    return "{}/api/datasources/{}".format(profile["grafana_url"], datasource_id)


def _get_datasource(profile, name):
    response = requests.get(
        "{}/api/datasources".format(profile["grafana_url"]),
        headers=_get_headers(profile),
        timeout=profile.get("grafana_timeout", 3),
    )
    data = response.json()
    for datasource in data:
        if datasource["name"] == name:
            return datasource
    return None


def _get_headers(profile):
    return {
        "Accept": "application/json",
        "Authorization": "Bearer {}".format(profile["grafana_token"]),
    }


def _get_json_data(
    name,
    type,
    url,
    access="proxy",
    user="",
    password="",
    database="",
    basic_auth=False,
    basic_auth_user="",
    basic_auth_password="",
    is_default=False,
    json_data=None,
):
    return {
        "name": name,
        "type": type,
        "url": url,
        "access": access,
        "user": user,
        "password": password,
        "database": database,
        "basicAuth": basic_auth,
        "basicAuthUser": basic_auth_user,
        "basicAuthPassword": basic_auth_password,
        "isDefault": is_default,
        "jsonData": json_data,
    }


def _diff(old, new):
    old_keys = old.keys()
    old = old.copy()
    new = new.copy()
    for key in old_keys:
        if key == "id" or key == "orgId":
            del old[key]
        elif key not in new.keys():
            del old[key]
        elif old[key] == new[key]:
            del old[key]
            del new[key]
    return {"old": old, "new": new}