from moto.core import BaseBackend


class Dimension(object):
    def __init__(self, name, value):
        self.name = name
        self.value = value


class FakeAlarm(object):
    def __init__(self, name, comparison_operator, evaluation_periods, period,
                 threshold, statistic, description, dimensions, alarm_actions,
                 ok_actions, insufficient_data_actions, unit):
        self.name = name
        self.comparison_operator = comparison_operator
        self.evaluation_periods = evaluation_periods
        self.period = period
        self.threshold = threshold
        self.statistic = statistic
        self.description = description
        self.dimensions = [Dimension(dimension['name'], dimension['value']) for dimension in dimensions]
        self.alarm_actions = alarm_actions
        self.ok_actions = ok_actions
        self.insufficient_data_actions = insufficient_data_actions
        self.unit = unit


class CloudWatchBackend(BaseBackend):

    def __init__(self):
        self.alarms = {}

    def put_metric_alarm(self, name, comparison_operator, evaluation_periods,
                         period, threshold, statistic, description, dimensions,
                         alarm_actions, ok_actions, insufficient_data_actions, unit):
        alarm = FakeAlarm(name, comparison_operator, evaluation_periods, period,
                          threshold, statistic, description, dimensions, alarm_actions,
                          ok_actions, insufficient_data_actions, unit)
        self.alarms[name] = alarm
        return alarm

    def get_all_alarms(self):
        return self.alarms.values()

    def delete_alarms(self, alarm_names):
        for alarm_name in alarm_names:
            self.alarms.pop(alarm_name, None)


cloudwatch_backend = CloudWatchBackend()