# Copyright 2014 Eucalyptus Systems, Inc.
#
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# with or without modification, are permitted provided that the following
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# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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import json
import urllib

from requestbuilder import Arg

from euca2ools.commands.iam import IAMRequest, AS_ACCOUNT


class GetRolePolicy(IAMRequest):
    DESCRIPTION = "Display a user's policy"
    ARGS = [Arg('-r', '--role-name', dest='RoleName', metavar='ROLE',
                required=True,
                help='role the poilcy is attached to (required)'),
            Arg('-p', '--policy-name', dest='PolicyName', metavar='POLICY',
                required=True, help='name of the policy to show (required)'),
            Arg('--pretty-print', action='store_true', route_to=None,
                help='reformat the policy for easier reading'),
            AS_ACCOUNT]

    def print_result(self, result):
        policy_content = urllib.unquote(result['PolicyDocument'])
        if self.args['pretty_print']:
            try:
                policy_json = json.loads(policy_content)
            except ValueError:
                self.log.debug('JSON parse error', exc_info=True)
                raise ValueError(
                    "policy '{0}' does not appear to be valid JSON"
                    .format(self.args['PolicyName']))
            policy_content = json.dumps(policy_json, indent=4)
        print policy_content
