#!/usr/bin/env python
'''
Zabbix host ansible module
'''
# vim: expandtab:tabstop=4:shiftwidth=4
#
#   Copyright 2015 Red Hat Inc.
#
#   Licensed 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.
#

# This is in place because each module looks similar to each other.
# These need duplicate code as their behavior is very similar
# but different for each zabbix class.
# pylint: disable=duplicate-code

# pylint: disable=import-error
from openshift_tools.monitoring.zbxapi import ZabbixAPI, ZabbixConnection

def exists(content, key='result'):
    ''' Check if key exists in content or the size of content[key] > 0
    '''
    if not content.has_key(key):
        return False

    if not content[key]:
        return False

    return True

def get_group_ids(zapi, hostgroup_names):
    '''
    get hostgroups
    '''
    # Fetch groups by name
    group_ids = []
    for hgr in hostgroup_names:
        content = zapi.get_content('hostgroup', 'get', {'search': {'name': hgr}})
        if content.has_key('result'):
            group_ids.append({'groupid': content['result'][0]['groupid']})

    return group_ids

def get_template_ids(zapi, template_names):
    '''
    get related templates
    '''
    template_ids = []
    # Fetch templates by name
    for template_name in template_names:
        content = zapi.get_content('template', 'get', {'search': {'host': template_name}})
        if content.has_key('result'):
            template_ids.append({'templateid': content['result'][0]['templateid']})
    return template_ids

def main():
    '''
    Ansible module for zabbix host
    '''

    module = AnsibleModule(
        argument_spec=dict(
            server=dict(default='https://localhost/zabbix/api_jsonrpc.php', type='str'),
            user=dict(default=os.environ['ZABBIX_USER'], type='str'),
            password=dict(default=os.environ['ZABBIX_PASSWORD'], type='str'),
            name=dict(default=None, type='str'),
            hostgroup_names=dict(default=[], type='list'),
            template_names=dict(default=[], type='list'),
            debug=dict(default=False, type='bool'),
            state=dict(default='present', type='str'),
            interfaces=dict(default=None, type='list'),
        ),
        #supports_check_mode=True
    )

    user = module.params['user']
    passwd = module.params['password']

    zapi = ZabbixAPI(ZabbixConnection(module.params['server'], user, passwd, module.params['debug']))

    #Set the instance and the template for the rest of the calls
    zbx_class_name = 'host'
    idname = "hostid"
    hname = module.params['name']
    state = module.params['state']

    # selectInterfaces doesn't appear to be working but is needed.
    content = zapi.get_content(zbx_class_name,
                               'get',
                               {'search': {'host': hname},
                                'selectGroups': 'groupid',
                                'selectParentTemplates': 'templateid',
                                'selectInterfaces': 'interfaceid',
                               })
    if state == 'list':
        module.exit_json(changed=False, results=content['result'], state="list")

    if state == 'absent':
        if not exists(content):
            module.exit_json(changed=False, state="absent")

        content = zapi.get_content(zbx_class_name, 'delete', [content['result'][0][idname]])
        module.exit_json(changed=True, results=content['result'], state="absent")

    if state == 'present':
        ifs = module.params['interfaces'] or [{'type':  1,         # interface type, 1 = agent
                                               'main':  1,         # default interface? 1 = true
                                               'useip':  1,        # default interface? 1 = true
                                               'ip':  '127.0.0.1', # default interface? 1 = true
                                               'dns':  '',         # dns for host
                                               'port':  '10050',   # port for interface? 10050
                                              }]
        params = {'host': hname,
                  'groups':  get_group_ids(zapi, module.params['hostgroup_names']),
                  'templates':  get_template_ids(zapi, module.params['template_names']),
                  'interfaces': ifs,
                 }

        if not exists(content):
            # if we didn't find it, create it
            content = zapi.get_content(zbx_class_name, 'create', params)
            module.exit_json(changed=True, results=content['result'], state='present')
        # already exists, we need to update it
        # let's compare properties
        differences = {}
        zab_results = content['result'][0]
        for key, value in params.items():

            if key == 'templates' and zab_results.has_key('parentTemplates'):
                if zab_results['parentTemplates'] != value:
                    differences[key] = value

            elif zab_results[key] != value and zab_results[key] != str(value):
                differences[key] = value

        if not differences:
            module.exit_json(changed=False, results=zab_results, state="present")

        # We have differences and need to update
        differences[idname] = zab_results[idname]
        content = zapi.get_content(zbx_class_name, 'update', differences)
        module.exit_json(changed=True, results=content['result'], state="present")

    module.exit_json(failed=True,
                     changed=False,
                     results='Unknown state passed. %s' % state,
                     state="unknown")

# pylint: disable=redefined-builtin, unused-wildcard-import, wildcard-import, locally-disabled
# import module snippets.  This are required
from ansible.module_utils.basic import *

main()