#!/usr/bin/python

DOCUMENTATION = '''
module: rabbitmq_binding
author: Manuel Sousa
version_added: 2.0

short_description: This module manages rabbitMQ bindings
description:
  - This module uses rabbitMQ Rest API to create/delete bindings
requirements: [ python requests ]
options:
    state:
        description:
            - Whether the exchange should be present or absent
            - Only present implemented atm
        choices: [ "present", "absent" ]
        required: false
        default: present
    name:
        description:
            - source exchange to create binding on
        required: true
        aliases: [ "src", "source" ]
    login_user:
        description:
            - rabbitMQ user for connection
        required: false
        default: guest
    login_password:
        description:
            - rabbitMQ password for connection
        required: false
        default: false
    login_host:
        description:
            - rabbitMQ host for connection
        required: false
        default: localhost
    login_port:
        description:
            - rabbitMQ management api port
        required: false
        default: 15672
    vhost:
        description:
            - rabbitMQ virtual host
            - default vhost is /
        required: false
        default: "/"
    destination:
        description:
            - destination exchange or queue for the binding
        required: true
        aliases: [ "dst", "dest" ]
    destinationType:
        description:
            - Either queue or exchange
        required: true
        choices: [ "queue", "exchange" ]
        aliases: [ "type", "destType" ]
    routingKey:
        description:
            - routing key for the binding
            - default is #
        required: false
        default: "#"
    arguments:
        description:
            - extra arguments for exchange. If defined this argument is a key/value dictionary
        required: false        
'''

EXAMPLES = '''
# Bind myQueue to directExchange with routing key info
- rabbitmq_binding: name=directExchange destination=myQueue type=queue routingKey=info

# Bind directExchange to topicExchange with routing key *.info
- rabbitmq_binding: name=topicExchange destination=topicExchange type=exchange routingKey="*.info"
'''

import requests
import urllib
import json

def main():
    module = AnsibleModule(
        argument_spec = dict(
            state = dict(default='present', choices=['present', 'absent'], type='str'),
            name = dict(required=True, aliases=[ "src", "source" ], type='str'),
            login_user = dict(default='guest', type='str'),
            login_password = dict(default='guest', type='str'),
            login_host = dict(default='localhost', type='str'),
            login_port = dict(default='15672', type='str'),
            vhost = dict(default='/', type='str'),
            destination = dict(required=True, aliases=[ "dst", "dest"], type='str'),
            destinationType = dict(required=True, aliases=[ "type", "destType"], choices=[ "queue", "exchange" ],type='str'),
            routingKey = dict(default='#', type='str'),
            arguments = dict(default=dict(), type='dict')
        ),
        supports_check_mode = True
    )

    url = "http://%s:%s/api/bindings/%s/e/%s/%s/%s/%s" % (
        module.params['login_host'],
        module.params['login_port'],
        urllib.quote(module.params['vhost'],''),
        module.params['name'],
        "q" if module.params['destinationType'] == "queue" else "e",        
        module.params['destination'],
        urllib.quote(module.params['routingKey'],'')
    )

    # Check if exchange already exists
    r = requests.get( url, auth=(module.params['login_user'],module.params['login_password']))

    if r.status_code==200:
        bindingExists = True
        response = r.json()
    elif r.status_code==404:
        bindingExists = False
        response = r.text
    else:
        module.fail_json(
            msg = "Invalid response from RESTAPI when trying to check if exchange exists",
            details = r.text
        )

    changeRequired = not bindingExists if module.params['state']=='present' else bindingExists

    # Exit if check_mode
    if module.check_mode:
        module.exit_json(
            changed= changeRequired,
            name = module.params['name'],
            details = response,
            arguments = module.params['arguments']
        )

    # Do changes
    if changeRequired:
        if module.params['state'] == 'present':
            url = "http://%s:%s/api/bindings/%s/e/%s/%s/%s" % (
                module.params['login_host'],
                module.params['login_port'],
                urllib.quote(module.params['vhost'],''),
                module.params['name'],
                "q" if module.params['destinationType'] == "queue" else "e",        
                module.params['destination']
            )

            r = requests.post(
                    url,
                    auth = (module.params['login_user'],module.params['login_password']),
                    headers = { "content-type": "application/json"},
                    data = json.dumps({
                        "routing_key": module.params['routingKey'],
                        "arguments": module.params['arguments']
                    })
                )
        elif module.params['state'] == 'absent':
            r = requests.delete( url, auth = (module.params['login_user'],module.params['login_password']))

        if r.status_code == 204 or r.status_code == 201:
            module.exit_json(
                changed = True,
                name = module.params['name'],
                destination = module.params['destination']
            )
        else:
            module.fail_json(
                msg = "Error creating exchange",
                status = r.status_code,
                details = r.text
            )

    else:
        module.exit_json(
            changed = False,
            name = module.params['name']
        )

# import module snippets
from ansible.module_utils.basic import *
main()