# Copyright (c) 2009-2010 Reza Lotun http://reza.lotun.name/
# Copyright (c) 2011 Jann Kleen
#
# Permission is hereby granted, free of charge, to any person obtaining a
# copy of this software and associated documentation files (the
# "Software"), to deal in the Software without restriction, including
# without limitation the rights to use, copy, modify, merge, publish, dis-
# tribute, sublicense, and/or sell copies of the Software, and to permit
# persons to whom the Software is furnished to do so, subject to the fol-
# lowing conditions:
#
# The above copyright notice and this permission notice shall be included
# in all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
# OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABIL-
# ITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT
# SHALL THE AUTHOR BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
# WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
# IN THE SOFTWARE.

from boto.resultset import ResultSet
from boto.ec2.elb.listelement import ListElement

class Alarm(object):
    def __init__(self, connection=None):
        self.connection = connection
        self.name = None
        self.alarm_arn = None

    def __repr__(self):
        return 'Alarm:%s' % self.name

    def startElement(self, name, attrs, connection):
        return None

    def endElement(self, name, value, connection):
        if name == 'AlarmName':
            self.name = value
        elif name == 'AlarmARN':
            self.alarm_arn = value
        else:
            setattr(self, name, value)


class AdjustmentType(object):
    def __init__(self, connection=None):
        self.connection = connection
        self.adjustment_types = ListElement([])

    def __repr__(self):
        return 'AdjustmentType:%s' % self.adjustment_types

    def startElement(self, name, attrs, connection):
        if name == 'AdjustmentType':
            return self.adjustment_types

    def endElement(self, name, value, connection):
        return


class MetricCollectionTypes(object):
    class BaseType(object):
        arg = ''
        def __init__(self, connection):
            self.connection = connection
            self.val = None
        def __repr__(self):
            return '%s:%s' % (self.arg, self.val)
        def startElement(self, name, attrs, connection):
            return
        def endElement(self, name, value, connection):
            if name == self.arg:
                self.val = value
    class Metric(BaseType):
        arg = 'Metric'
    class Granularity(BaseType):
        arg = 'Granularity'

    def __init__(self, connection=None):
        self.connection = connection
        self.metrics = []
        self.granularities = []

    def __repr__(self):
        return 'MetricCollectionTypes:<%s, %s>' % (self.metrics, self.granularities)

    def startElement(self, name, attrs, connection):
        if name == 'Granularities':
            self.granularities = ResultSet([('member', self.Granularity)])
            return self.granularities
        elif name == 'Metrics':
            self.metrics = ResultSet([('member', self.Metric)])
            return self.metrics

    def endElement(self, name, value, connection):
        return


class ScalingPolicy(object):
    def __init__(self, connection=None, **kwargs):
        """
        Scaling Policy

        :type name: str
        :param name: Name of scaling policy.

        :type adjustment_type: str
        :param adjustment_type: Specifies the type of adjustment. Valid values are `ChangeInCapacity`, `ExactCapacity` and `PercentChangeInCapacity`.

        :type as_name: str or int
        :param as_name: Name or ARN of the Auto Scaling Group.

        :type scaling_adjustment: int
        :param scaling_adjustment: Value of adjustment (type specified in `adjustment_type`).

        :type min_adjustment_step: int
        :param min_adjustment_step: Value of min adjustment step required to
            apply the scaling policy (only make sense when use `PercentChangeInCapacity` as adjustment_type.).

        :type cooldown: int
        :param cooldown: Time (in seconds) before Alarm related Scaling Activities can start after the previous Scaling Activity ends.

        """
        self.name = kwargs.get('name', None)
        self.adjustment_type = kwargs.get('adjustment_type', None)
        self.as_name = kwargs.get('as_name', None)
        self.scaling_adjustment = kwargs.get('scaling_adjustment', None)
        self.cooldown = kwargs.get('cooldown', None)
        self.connection = connection
        self.min_adjustment_step = kwargs.get('min_adjustment_step', None)

    def __repr__(self):
        return 'ScalingPolicy(%s group:%s adjustment:%s)' % (self.name,
                                                             self.as_name,
                                                             self.adjustment_type)

    def startElement(self, name, attrs, connection):
        if name == 'Alarms':
            self.alarms = ResultSet([('member', Alarm)])
            return self.alarms

    def endElement(self, name, value, connection):
        if name == 'PolicyName':
            self.name = value
        elif name == 'AutoScalingGroupName':
            self.as_name = value
        elif name == 'PolicyARN':
            self.policy_arn = value
        elif name == 'ScalingAdjustment':
            self.scaling_adjustment = int(value)
        elif name == 'Cooldown':
            self.cooldown = int(value)
        elif name == 'AdjustmentType':
            self.adjustment_type = value
        elif name == 'MinAdjustmentStep':
            self.min_adjustment_step = int(value)

    def delete(self):
        return self.connection.delete_policy(self.name, self.as_name)


class TerminationPolicies(list):
    def __init__(self, connection=None, **kwargs):
        pass

    def startElement(self, name, attrs, connection):
        pass

    def endElement(self, name, value, connection):
        if name == 'member':
            self.append(value)
