#!/usr/bin/python
# -*- coding: utf-8 -*-

# (c) 2013-2014, Epic Games, Inc.
#
# This file is part of Ansible
#
# Ansible is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# Ansible is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with Ansible. If not, see <http://www.gnu.org/licenses/>.
#

DOCUMENTATION = '''
---
module: zabbix_hostmacro
short_description: Zabbix host macro creates/updates/deletes
description:
   - manages Zabbix host macros, it can create, update or delete them.
version_added: "2.0"
author: Dean Hailin Song
requirements:
    - zabbix-api python module
options:
    server_url:
        description:
            - Url of Zabbix server, with protocol (http or https).
        required: true
        aliases: [ "url" ]
    login_user:
        description:
            - Zabbix user name.
        required: true
    login_password:
        description:
            - Zabbix user password.
        required: true
    host_name:
        description:
            - Name of the host.
        required: true
    macro_name:
        description:
            - Name of the host macro.
        required: true
    macro_value:
        description:
            - Value of the host macro.
        required: true
    state:
        description:
            - 'Possible values are: "present" and "absent". If the macro already exists, and the state is "present", it will just to update the macro if needed.'
        required: false
        default: "present"
    timeout:
        description:
            - The timeout of API request(seconds).
        default: 10
'''

EXAMPLES = '''
- name: Create a new host macro or update an existing macro's value
  local_action:
    module: zabbix_hostmacro
    server_url: http://monitor.example.com
    login_user: username
    login_password: password
    host_name: ExampleHost
    macro_name:Example macro
    macro_value:Example value
    state: present
'''

import logging
import copy
from ansible.module_utils.basic import *

try:
    from zabbix_api import ZabbixAPI, ZabbixAPISubClass

    HAS_ZABBIX_API = True
except ImportError:
    HAS_ZABBIX_API = False


# Extend the ZabbixAPI
# Since the zabbix-api python module too old (version 1.0, no higher version so far).
class ZabbixAPIExtends(ZabbixAPI):
    def __init__(self, server, timeout, **kwargs):
        ZabbixAPI.__init__(self, server, timeout=timeout)


class HostMacro(object):
    def __init__(self, module, zbx):
        self._module = module
        self._zapi = zbx

    # exist host
    def is_host_exist(self, host_name):
        result = self._zapi.host.exists({'host': host_name})
        return result

    # get host id by host name
    def get_host_id(self, host_name):
        try:
            host_list = self._zapi.host.get({'output': 'extend', 'filter': {'host': host_name}})
            if len(host_list) < 1:
                self._module.fail_json(msg="Host not found: %s" % host_name)
            else:
                host_id = host_list[0]['hostid']
                return host_id
        except Exception, e:
            self._module.fail_json(msg="Failed to get the host %s id: %s." % (host_name, e))

    # get host macro
    def get_host_macro(self, macro_name, host_id):
        try:
            host_macro_list = self._zapi.usermacro.get(
                {"output": "extend", "selectSteps": "extend", 'hostids': [host_id], 'filter': {'macro': '{$' + macro_name + '}'}})
            if len(host_macro_list) > 0:
                return host_macro_list[0]
            return None
        except Exception, e:
            self._module.fail_json(msg="Failed to get host macro %s: %s" % (macro_name, e))

    # create host macro
    def create_host_macro(self, macro_name, macro_value, host_id):
        try:
            if self._module.check_mode:
                self._module.exit_json(changed=True)
            self._zapi.usermacro.create({'hostid': host_id, 'macro': '{$' + macro_name + '}', 'value': macro_value})
            self._module.exit_json(changed=True, result="Successfully added host macro %s " % macro_name)
        except Exception, e:
            self._module.fail_json(msg="Failed to create host macro %s: %s" % (macro_name, e))

    # update host macro
    def update_host_macro(self, host_macro_obj, macro_name, macro_value):
        host_macro_id = host_macro_obj['hostmacroid']
        try:
            if self._module.check_mode:
                self._module.exit_json(changed=True)
            self._zapi.usermacro.update({'hostmacroid': host_macro_id, 'value': macro_value})
            self._module.exit_json(changed=True, result="Successfully updated host macro %s " % macro_name)
        except Exception, e:
            self._module.fail_json(msg="Failed to updated host macro %s: %s" % (macro_name, e))

    # delete host macro
    def delete_host_macro(self, host_macro_obj, macro_name):
        host_macro_id = host_macro_obj['hostmacroid']
        try:
            if self._module.check_mode:
                self._module.exit_json(changed=True)
            self._zapi.usermacro.delete([host_macro_id])
            self._module.exit_json(changed=True, result="Successfully deleted host macro %s " % macro_name)
        except Exception, e:
            self._module.fail_json(msg="Failed to delete host macro %s: %s" % (macro_name, e))

def main():
    module = AnsibleModule(
        argument_spec=dict(
            server_url=dict(required=True, default=None, aliases=['url']),
            login_user=dict(required=True),
            login_password=dict(required=True),
            host_name=dict(required=True),
            macro_name=dict(required=True),
            macro_value=dict(required=True),
            state=dict(default="present"),
            timeout=dict(default=10)
        ),
        supports_check_mode=True
    )

    if not HAS_ZABBIX_API:
        module.fail_json(msg="Missing requried zabbix-api module (check docs or install with: pip install zabbix-api)")

    server_url = module.params['server_url']
    login_user = module.params['login_user']
    login_password = module.params['login_password']
    host_name = module.params['host_name']
    macro_name  = (module.params['macro_name']).upper()
    macro_value = module.params['macro_value']
    state = module.params['state']
    timeout = module.params['timeout']

    zbx = None
    # login to zabbix
    try:
        zbx = ZabbixAPIExtends(server_url, timeout=timeout)
        zbx.login(login_user, login_password)
    except Exception, e:
        module.fail_json(msg="Failed to connect to Zabbix server: %s" % e)

    host_macro_class_obj = HostMacro(module, zbx)

    changed = False

    if host_name:
        host_id = host_macro_class_obj.get_host_id(host_name)
        host_macro_obj = host_macro_class_obj.get_host_macro(macro_name, host_id)

    if state == 'absent':
        if not host_macro_obj:
            module.exit_json(changed=False, msg="Host Macro %s does not exist" % macro_name)
        else:
            # delete a macro
            host_macro_class_obj.delete_host_macro(host_macro_obj, macro_name)
    else:
        if not host_macro_obj:
            # create host macro
            host_macro_class_obj.create_host_macro(macro_name, macro_value, host_id)
        else:
            # update host macro
            host_macro_class_obj.update_host_macro(host_macro_obj, macro_name, macro_value)

from ansible.module_utils.basic import *
main()