# -*- coding: utf-8 -*-
'''
Module for handling maas calls.

:optdepends:    pyapi-maas Python adapter
:configuration: This module is not usable until the following are specified
                either in a pillar or in the minion's config file::

        maas.url: 'https://maas.domain.com/'
        maas.token: fdsfdsdsdsfa:fsdfae3fassd:fdsfdsfsafasdfsa

'''

from __future__ import absolute_import

import io
import logging
import os.path
import subprocess
import urllib2
import hashlib

import json

LOG = logging.getLogger(__name__)

# Import third party libs
HAS_MASS = False
try:
    from apiclient.maas_client import MAASClient, MAASDispatcher, MAASOAuth
    HAS_MASS = True
except ImportError:
    LOG.exception('why??')

def __virtual__():
    '''
    Only load this module if maas-client
    is installed on this minion.
    '''
    if HAS_MASS:
        return 'maas'
    return False

APIKEY_FILE = '/var/lib/maas/.maas_credentials'

def _format_data(data):
    class Lazy:
        def __str__(self):
            return ' '.join(['{0}={1}'.format(k, v)
                             for k, v in data.iteritems()])

    return Lazy()


def _create_maas_client():
    global APIKEY_FILE
    try:
        api_token = file(APIKEY_FILE).read().strip().split(':')
    except:
        LOG.exception('token')
    auth = MAASOAuth(*api_token)
    api_url = 'http://localhost:5240/MAAS'
    dispatcher = MAASDispatcher()
    return MAASClient(auth, dispatcher, api_url)

class MaasObject(object):
    def __init__(self):
        self._maas = _create_maas_client()
        self._extra_data_urls = {}
        self._extra_data = {}
        self._update = False
        self._element_key = 'name'
        self._update_key = 'id'

    def send(self, data):
        LOG.info('%s %s', self.__class__.__name__.lower(), _format_data(data))
        if self._update:
            return self._maas.put(self._update_url.format(data[self._update_key]), **data).read()
        return self._maas.post(self._create_url, None, **data).read()

    def process(self):
        config = __salt__['config.get']('maas')
        for part in self._config_path.split('.'):
            config = config.get(part, {})
        extra = {}
        for name, url_call in self._extra_data_urls.iteritems():
            key = 'id'
            if isinstance(url_call, tuple):
                url_call, key = url_call[:]
            extra[name] = {v['name']: v[key] for v in
                            json.loads(self._maas.get(url_call).read())}
        elements = self._maas.get(self._all_elements_url).read()
        all_elements = {v[self._element_key]: v for v in json.loads(elements)}
        ret = {
            'success': [],
            'errors': {},
            'updated': [],
        }
        for name, config_data in config.iteritems():
            try:
                data = self.fill_data(name, config_data, **extra)
                if name in all_elements:
                    self._update = True
                    LOG.error('%s DATA %s', all_elements[name], data)
                    data = self.update(data, all_elements[name])
                    self.send(data)
                    ret['updated'].append(name)
                else:
                    self.send(data)
                    ret['success'].append(name)
            except urllib2.HTTPError as e:
                etxt = e.read()
                LOG.exception('Failed for object %s reason %s', name, etxt)
                ret['errors'][name] = str(etxt)
            except Exception as e:
                LOG.exception('Failed for object %s reason %s', name, e)
                ret['errors'][name] = str(e)
        if ret['errors']:
            raise Exception(ret)
        return ret


class Fabric(MaasObject):
    def __init__(self):
        super(Fabric, self).__init__()
        self._all_elements_url = u'api/2.0/fabrics/'
        self._create_url = u'api/2.0/fabrics/'
        self._update_url = u'api/2.0/fabrics/{0}/'
        self._config_path = 'region.fabrics'
#        self._update_keys = ['name', 'description', 'class_type', 'id']

    def fill_data(self, name, fabric):
        data = {
            'name': name,
            'description': fabric.get('description', ''),
        }
        if 'class_type' in fabric:
            data['class_type'] = fabric.get('class_type'),
        return data

    def update(self, new, old):
        new['id'] = str(old['id'])
        return new

class Subnet(MaasObject):
    def __init__(self):
        super(Subnet, self).__init__()
        self._all_elements_url = u'api/2.0/subnets/'
        self._create_url = u'api/2.0/subnets/'
        self._update_url = u'api/2.0/subnets/{0}/'
        self._config_path = 'region.subnets'
        self._extra_data_urls = {'fabrics':u'api/2.0/fabrics/'}

    def fill_data(self, name, subnet, fabrics):
        data = {
            'name': name,
            'fabric': str(fabrics[subnet.get('fabric', '')]),
            'cidr': subnet.get('cidr'),
            'gateway_ip': subnet['gateway_ip'],
        }
        self._iprange = subnet['iprange']
        return data

    def update(self, new, old):
        new['id'] = str(old['id'])
        return new

    def send(self, data):
        response = super(Subnet, self).send(data)
        res_json = json.loads(response)
        self._process_iprange(res_json['id'])
        return response

    def _process_iprange(self, subnet_id):
        ipranges = json.loads(self._maas.get(u'api/2.0/ipranges/').read())
        LOG.warn('all %s ipranges %s', subnet_id, ipranges)
        update = False
        old_data = None
        for iprange in ipranges:
            if iprange['subnet']['id'] == subnet_id:
                update = True
                old_data = iprange
                break
        data = {
            'start_ip': self._iprange.get('start'),
            'end_ip': self._iprange.get('end'),
            'subnet': str(subnet_id),
            'type': self._iprange.get('type', 'dynamic')
        }
        LOG.warn('INFO: %s\n OLD: %s', data, old_data)
        LOG.info('iprange %s', _format_data(data))
        if update:
            LOG.warn('UPDATING %s %s', data, old_data)
            self._maas.put(u'api/2.0/ipranges/{0}/'.format(old_data['id']), **data)
        else:
            self._maas.post(u'api/2.0/ipranges/', None, **data)

class DHCPSnippet(MaasObject):
    def __init__(self):
        super(DHCPSnippet, self).__init__()
        self._all_elements_url = u'api/2.0/dhcp-snippets/'
        self._create_url = u'api/2.0/dhcp-snippets/'
        self._update_url = u'api/2.0/dhcp-snippets/{0}/'
        self._config_path = 'region.dhcp_snippets'
        self._extra_data_urls = {'subnets': u'api/2.0/subnets/'}

    def fill_data(self, name, snippet, subnets):
        data = {
             'name': name,
             'value': snippet['value'],
             'description': snippet['description'],
             'enabled': str(snippet['enabled'] and 1 or 0),
             'subnet': str(subnets[snippet['subnet']]),
        }
        return data

    def update(self, new, old):
        new['id'] = str(old['id'])
        return new

class PacketRepository(MaasObject):
    def __init__(self):
        super(PacketRepository, self).__init__()
        self._all_elements_url = u'api/2.0/package-repositories/'
        self._create_url = u'api/2.0/package-repositories/'
        self._update_url = u'api/2.0/package-repositories/{0}/'
        self._config_path = 'region.package_repositories'

    def fill_data(self, name, package_repository):
        data = {
            'name': name,
            'url': package_repository['url'],
            'distributions': package_repository['distributions'],
            'components': package_repository['components'],
            'arches': package_repository['arches'],
            'key': package_repository['key'],
            'enabled': str(package_repository['enabled'] and 1 or 0),
        }
        if 'disabled_pockets' in package_repository:
            data['disabled_pockets'] = package_repository['disable_pockets'],
        return data

    def update(self, new, old):
        new['id'] = str(old['id'])
        return new

class Device(MaasObject):
    def __init__(self):
        super(Device, self).__init__()
        self._all_elements_url = u'api/2.0/devices/'
        self._create_url = u'api/2.0/devices/'
        self._update_url = u'api/2.0/devices/{0}/'
        self._config_path = 'region.devices'
        self._element_key = 'hostname'
        self._update_key = 'system_id'

    def fill_data(self, name, device_data):
        data = {
            'mac_addresses': device_data['mac'],
            'hostname': name,
        }
        self._interface = device_data['interface']
        return data

    def update(self, new, old):
        new_macs = set(new['mac_addresses'])
        old_macs = set(v['mac_address'] for v in old[interface_set])
        if new_macs - old_macs:
            self._update = False
            self._maas.delete(u'api/2.0/devices/{0}/'.format(old['system_id']))
        else:
            new[self._update_key] = str(old[self._update_key])
        return new

    def send(self, data):
        response = super(Device, self).send(data)
        resp_json = json.loads(response)
        system_id = resp_json['system_id']
        iface_id = resp_json['interface_set'][0]['id']
        self._link_interface(maas, system_id, iface_id)
        return response

    def _link_interface(self, system_id, interface_id):
        data = {
            'mode': self._interface.get('mode', 'STATIC'),
            'subnet': self._interface.get('subnet'),
            'ip_address': self._interface.get('ip_address'),
        }
        if 'default_gateway' in self._interface:
            data['default_gateway'] = self._interface.get('default_gateway')
        if self._update:
            data['force'] = '1'
        LOG.info('interfaces link_subnet %s %s %s', system_id, interface_id,
                _format_data(data))
        self._maas.post(u'/api/2.0/nodes/{0}/interfaces/{1}/'
                        .format(system_id, interface_id), 'link_subnet',
                        **data)


class Machine(MaasObject):
    def __init__(self):
        super(Machine, self).__init__()
        self._all_elements_url = u'api/2.0/machines/'
        self._create_url = u'api/2.0/machines/'
        self._update_url = u'api/2.0/machines/{0}/'
        self._config_path = 'region.machines'
        self._element_key = 'hostname'
        self._update_key = 'system_id'

    def fill_data(self, name, machine_data):
        main_interface = next(machine_data['interfaces'][0].iteritems())
        interfaces = machine_data['interfaces'][1:]
        power_data = machine_data['power_parameters']
        data = {
            'hostname': name,
            'architecture': machine_data.get('architecture', 'amd64/generic'),
            'mac_addresses': main_interface[1],
            'power_type': machine_data.get('power_type', 'ipmi'),
            'power_parameters_power_address': power_data['power_address'],
        }
        if 'power_user' in power_data:
            data['power_parameters_power_user'] = power_data['power_user']
        if 'power_password' in power_data:
            data['power_parameters_power_pass'] = \
                power_data['power_password']
        return data

    def update(self, new, old):
        new_macs = set(new['mac_addresses'])
        old_macs = set(v['mac_address'] for v in old[interface_set])
        if new_macs - old_macs:
            self._update = False
            self._maas.delete(u'api/2.0/machiens/{0}/'.format(old['system_id']))
        else:
            new[self._update_key] = str(old[self._update_key])
        return new

class BootResource(MaasObject):
    def __init__(self):
        super(BootResource, self).__init__()
        self._all_elements_url = u'api/2.0/boot-resources/'
        self._create_url = u'api/2.0/boot-resources/'
        self._update_url = u'api/2.0/boot-resources/{0}/'
        self._config_path = 'region.boot_resources'

    def fill_data(self, name, boot_data):
        sha256 = hashlib.sha256()
        sha256.update(file(boot_data['content']).read())
        data = {
            'name': name,
            'title': boot_data['title'],
            'architecture': boot_data['architecture'],
            'filetype': boot_data['filetype'],
            'size': str(os.path.getsize(boot_data['content'])),
            'sha256': sha256.hexdigest(),
            'content': io.open(boot_data['content']),
        }
        return data

    def update(self, new, old):
        self._update = False
        return new

def process_fabrics():
    return Fabric().process()

def process_subnets():
    return Subnet().process()

def process_dhcp_snippets():
    return DHCPSnippet().process()

def process_package_repositories():
    return PacketRepository().process()

def process_devices():
    return Device().process()

def process_machines():
    return Machine().process()

def process_boot_resources():
    return BootResource().process()