# Copyright 2014 Eucalyptus Systems, Inc.
#
# 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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# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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from requestbuilder import Arg
from requestbuilder.response import PaginatedResponse

from euca2ools.commands.iam import IAMRequest, AS_ACCOUNT
from euca2ools.commands.iam.getrolepolicy import GetRolePolicy


class ListRolePolicies(IAMRequest):
    DESCRIPTION = ('List one specific policy or all policies attached to a '
                   'role.  If no policies are attached to the role, the '
                   'action still succeeds.')
    ARGS = [Arg('-r', '--role-name', dest='RoleName', metavar='ROLE',
                required=True, help='role owning the policies to list'),
            Arg('-p', '--policy-name', metavar='POLICY', route_to=None,
                help='display a specific policy'),
            Arg('-v', '--verbose', action='store_true', route_to=None,
                help='''display the contents of the resulting policies (in
                        addition to their names)'''),
            Arg('--pretty-print', action='store_true', route_to=None,
                help='''when printing the contents of policies, reformat them
                        for easier reading'''),
            AS_ACCOUNT]
    LIST_TAGS = ['PolicyNames']

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

    def prepare_for_page(self, page):
        # Pages are defined by markers
        self.params['Marker'] = page

    def get_next_page(self, response):
        if response.get('IsTruncated') == 'true':
            return response['Marker']

    def print_result(self, result):
        if self.args.get('policy_name'):
            # Look for the specific policy the user asked for
            for policy_name in result.get('PolicyNames', []):
                if policy_name == self.args['policy_name']:
                    if self.args['verbose']:
                        self.print_policy(policy_name)
                    else:
                        print policy_name
                    break
        else:
            for policy_name in result.get('PolicyNames', []):
                print policy_name
                if self.args['verbose']:
                    self.print_policy(policy_name)
        # We already take care of pagination
        print 'IsTruncated: false'

    def print_policy(self, policy_name):
        req = GetRolePolicy.from_other(
            self, RoleName=self.args['RoleName'], PolicyName=policy_name,
            pretty_print=self.args['pretty_print'],
            DelegateAccount=self.params.get('DelegateAccount'))
        response = req.main()
        req.print_result(response)
