# Copyright (c) 2013-2016 Hewlett Packard Enterprise Development LP
#
# Redistribution and use of this software in source and binary forms,
# with or without modification, are permitted provided that the following
# conditions are met:
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#   Redistributions of source code must retain the above copyright notice,
#   this list of conditions and the following disclaimer.
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# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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from requestbuilder import Arg
from requestbuilder.mixins import TabifyingMixin
from requestbuilder.response import PaginatedResponse

from euca2ools.commands.argtypes import delimited_list
from euca2ools.commands.monitoring import CloudWatchRequest
from euca2ools.commands.monitoring.argtypes import cloudwatch_dimension


class ListMetrics(CloudWatchRequest, TabifyingMixin):
    DESCRIPTION = 'Show a list of monitoring metrics'
    ARGS = [Arg('-d', '--dimensions', dest='Dimensions.member',
                metavar='KEY1=VALUE1,KEY2=VALUE2,...',
                type=delimited_list(',', item_type=cloudwatch_dimension),
                help='limit results to metrics with specific dimensions'),
            Arg('-m', '--metric-name', dest='MetricName', metavar='METRIC',
                help='limit results to a specific metric'),
            Arg('-n', '--namespace', dest='Namespace', metavar='NAMESPACE',
                help='limit results to metrics in a specific namespace')]
    LIST_TAGS = ['Metrics', 'Dimensions']

    def main(self):
        return PaginatedResponse(self, (None,), ('Metrics',))

    def prepare_for_page(self, page):
        self.params['NextToken'] = page

    # pylint: disable=no-self-use
    def get_next_page(self, response):
        return response.get('NextToken') or None
    # pylint: enable=no-self-use

    def print_result(self, result):
        out_lines = []
        for metric in sorted(result.get('Metrics', [])):
            if len(metric.get('Dimensions', [])) > 0:
                formatted_dims = ['{0}={1}'.format(dimension.get('Name'),
                                                   dimension.get('Value'))
                                  for dimension in metric['Dimensions']]
                out_lines.append((metric.get('MetricName'),
                                  metric.get('Namespace'),
                                  '{{{0}}}'.format(','.join(formatted_dims))))
            else:
                out_lines.append((metric.get('MetricName'),
                                  metric.get('Namespace'), None))
        for out_line in sorted(out_lines):
            print self.tabify(out_line)