# This file is part of the Indico plugins.
# Copyright (C) 2002 - 2022 CERN
#
# The Indico plugins are free software; you can redistribute
# them and/or modify them under the terms of the MIT License;
# see the LICENSE file for more details.

from base64 import b64encode

from flask_pluginengine import current_plugin

from indico_piwik.queries.base import PiwikQueryReportEventBase


class PiwikQueryReportEventGraphBase(PiwikQueryReportEventBase):
    """Base Piwik query for retrieving PNG graphs"""

    def call(self, apiModule, apiAction, height=None, width=None, graphType='verticalBar', **query_params):
        if height is not None:
            query_params['height'] = height
        if width is not None:
            query_params['width'] = width
        return super().call(method='ImageGraph.get', apiModule=apiModule, apiAction=apiAction, aliasedGraph='1',
                            graphType=graphType, **query_params)

    def get_result(self):
        """Perform the call and return the graph data

        :return: Encoded PNG graph data string to be inserted in a `src`
                 atribute of a HTML img tag.
        """
        png = self.call()
        if png is None:
            return
        if png.startswith(b'GD extension must be loaded'):
            current_plugin.logger.warning('Piwik server answered on ImageGraph.get: %s', png)
            return
        return f'data:image/png;base64,{b64encode(png).decode()}'


class PiwikQueryReportEventGraphCountries(PiwikQueryReportEventGraphBase):
    def call(self, **query_params):
        return super().call(apiModule='UserCountry', apiAction='getCountry', period='range', width=490, height=260,
                            graphType='horizontalBar', **query_params)


class PiwikQueryReportEventGraphDevices(PiwikQueryReportEventGraphBase):
    def call(self, **query_params):
        return super().call(apiModule='DevicesDetection', apiAction='getOsVersions', period='range', width=320,
                            height=260, graphType='horizontalBar', **query_params)
