#!/usr/bin/env python
# encoding: utf-8
# Licensed to the Apache Software Foundation (ASF) under one
# or more contributor license agreements.  See the NOTICE file
# distributed with this work for additional information
# regarding copyright ownership.  The ASF licenses this file
# to you under the Apache License, Version 2.0 (the
# "License"); you may not use this file except in compliance
# with the License.  You may obtain a copy of the License at
#
#   http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing,
# software distributed under the License is distributed on an
# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
# KIND, either express or implied.  See the License for the
# specific language governing permissions and limitations
# under the License.

from gstack import app
from gstack import authentication
from gstack import controllers
from gstack import helpers
from gstack.services import requester
from gstack.controllers import errors
from flask import jsonify, request, url_for
import json


def _cloudstack_securitygroup_to_gce(cloudstack_response):
    if 'ingressrule' in cloudstack_response:
        rules = cloudstack_response['ingressrule']
        allowed = []
        sourceranges = []
        for rule in rules:
            ports = []
            if 'startport' in rule:
                for i in range(rule['startport'], rule['endport'] + 1):
                    ports.append(str(i))
            allowed.append({
                "IPProtocol": rule['protocol'],
                "ports": ports
            })
            if 'cidr' in rule.keys():
                sourceranges.append(rule['cidr'])
        return ({
            "kind": "compute#firewall",
            "selfLink": '',
            "id": cloudstack_response['id'],
            "creationTimestamp": '',
            "name": cloudstack_response['name'],
            "description": cloudstack_response['description'],
            "network": '',
            "sourceRanges": sourceranges,
            "sourceTags": [
                ''
            ],
            "targetTags": cloudstack_response['tags'],
            "allowed": allowed
        })


@app.route('/compute/v1/projects/<projectid>/global/firewalls', methods=['GET'])
@authentication.required
def listsecuritygroups(projectid, authorization):
    args = {'command': 'listSecurityGroups'}
    items = controllers.describe_items(
        authorization, args, 'securitygroup',
        _cloudstack_securitygroup_to_gce, **{})

    populated_response = {
        'kind': 'compute#firewallList',
        'id': 'projects/' + projectid + '/global/firewalls',
        'selfLink': request.base_url,
        'items': items
    }

    return helpers.create_response(data=populated_response)


@app.route('/compute/v1/projects/<projectid>/global/firewalls/<firewall>', methods=['GET'])
@authentication.required
def getsecuritygroup(projectid, authorization, firewall):
    command = 'listSecurityGroups'
    args = {
        'securitygroupname': firewall
    }
    cloudstack_response = requester.make_request(
        command,
        args,
        authorization.client_id,
        authorization.client_secret
    )
    cloudstack_response = cloudstack_response

    app.logger.debug(
        'Processing request for get Firewall\n'
        'Project: ' + projectid + '\n' +
        'Firewall: ' + firewall + '\n' +
        json.dumps(cloudstack_response, indent=4, separators=(',', ': '))
    )

    if cloudstack_response['listsecuritygroupsresponse']['securitygroup']:
        response_item = cloudstack_response[
            'listsecuritygroupsresponse']['securitygroup'][0]
        firewall = _cloudstack_securitygroup_to_gce(response_item)
        res = jsonify(firewall)
        res.status_code = 200

    else:
        func_route = url_for('getsecuritygroup', projectid=projectid,
                             firewall=firewall)
        res = errors.resource_not_found(func_route)

    return res


@app.route('/compute/v1/projects/<projectid>/global/firewalls/<firewall>', methods=['DELETE'])
@authentication.required
def deletesecuritygroup(projectid, authorization, firewall):
    command = 'deleteSecurityGroup'
    args = {'name': firewall}
    cloudstack_response = requester.make_request(
        command,
        args,
        authorization.client_id,
        authorization.client_secret
    )

    cloudstack_response = cloudstack_response

    app.logger.debug(
        'Processing request for deleting a Firewall \n'
        'Project: ' + projectid + '\n' +
        'Firewall: ' + firewall + '\n' +
        json.dumps(cloudstack_response, indent=4, separators=(',', ': '))
    )

    populated_response = {}

    res = jsonify(populated_response)
    res.status_code = 200
    return res


@app.route('/compute/v1/projects/<projectid>/global/firewalls', methods=['POST'])
@authentication.required
def createsecuritygroup(projectid, authorization):
    command = 'createSecurityGroup'
    res = json.loads(request.data)
    args = {'name': res['name'],
            'description': res['description']}
    cloudstack_response = requester.make_request(
        command,
        args,
        authorization.client_id,
        authorization.client_secret
    )

    cloudstack_response = cloudstack_response

    app.logger.debug(
        'Processing request for creating a Firewall \n'
        'Project: ' + projectid + '\n' +
        'Firewall: ' + res['name'] + '\n' +
        json.dumps(cloudstack_response, indent=4, separators=(',', ': '))
    )

    net_protocol_codes = {'1': 'icmp', '6': 'tcp', '17': 'udp'}

    rules = res['allowed']
    if rules is not []:
        for rule in rules:
            command = 'authorizeSecurityGroupIngress'
            args = {'securitygroupname': res['name'],
                    'protocol': net_protocol_codes[str(rule['IPProtocol'])],
                    'startport': rule['ports'][0],
                    'endport': rule['ports'][0],
                    'cidrlist': ','.join([cidr for cidr in
                                          res['sourceRanges']])}
            cloudstack_response = requester.make_request(
                command,
                args,
                authorization.client_id,
                authorization.client_secret
            )

            cloudstack_response = cloudstack_response

            app.logger.debug(
                'Processing request for adding a rule to a Firewall \n'
                'Project: ' + projectid + '\n' +
                'Firewall: ' + res['name'] + '\n' +
                json.dumps(cloudstack_response,
                           indent=4, separators=(',', ': '))
            )

    # return Global Operations
    populated_response = {}
    res = jsonify(populated_response)
    res.status_code = 200
    return res