import re
import json
import time
import logging
import urllib2
import urlparse
from functools import partial, wraps

import netaddr

from keystoneclient.v2_0 import Client as keystoneclient
from keystoneclient import exceptions


logger = logging.getLogger("wally.fuel_api")


class Urllib2HTTP(object):
    """
    class for making HTTP requests
    """

    allowed_methods = ('get', 'put', 'post', 'delete', 'patch', 'head')

    def __init__(self, root_url, headers=None):
        """
        """
        if root_url.endswith('/'):
            self.root_url = root_url[:-1]
        else:
            self.root_url = root_url

        self.headers = headers if headers is not None else {}

    def host(self):
        return self.root_url.split('/')[2]

    def do(self, method, path, params=None):
        if path.startswith('/'):
            url = self.root_url + path
        else:
            url = self.root_url + '/' + path

        if method == 'get':
            assert params == {} or params is None
            data_json = None
        else:
            data_json = json.dumps(params)

        logger.debug("HTTP: {} {}".format(method.upper(), url))

        request = urllib2.Request(url,
                                  data=data_json,
                                  headers=self.headers)
        if data_json is not None:
            request.add_header('Content-Type', 'application/json')

        request.get_method = lambda: method.upper()
        response = urllib2.urlopen(request)

        logger.debug("HTTP Responce: {}".format(response.code))

        if response.code < 200 or response.code > 209:
            raise IndexError(url)

        content = response.read()

        if '' == content:
            return None

        return json.loads(content)

    def __getattr__(self, name):
        if name in self.allowed_methods:
            return partial(self.do, name)
        raise AttributeError(name)


class KeystoneAuth(Urllib2HTTP):
    def __init__(self, root_url, creds, headers=None):
        super(KeystoneAuth, self).__init__(root_url, headers)
        admin_node_ip = urlparse.urlparse(root_url).hostname
        self.keystone_url = "http://{0}:5000/v2.0".format(admin_node_ip)
        self.keystone = keystoneclient(
            auth_url=self.keystone_url, **creds)
        self.refresh_token()

    def refresh_token(self):
        """Get new token from keystone and update headers"""
        try:
            self.keystone.authenticate()
            self.headers['X-Auth-Token'] = self.keystone.auth_token
        except exceptions.AuthorizationFailure:
            logger.warning(
                'Cant establish connection to keystone with url %s',
                self.keystone_url)

    def do(self, method, path, params=None):
        """Do request. If gets 401 refresh token"""
        try:
            return super(KeystoneAuth, self).do(method, path, params)
        except urllib2.HTTPError as e:
            if e.code == 401:
                logger.warning(
                    'Authorization failure: {0}'.format(e.read()))
                self.refresh_token()
                return super(KeystoneAuth, self).do(method, path, params)
            else:
                raise


def get_inline_param_list(url):
    format_param_rr = re.compile(r"\{([a-zA-Z_]+)\}")
    for match in format_param_rr.finditer(url):
        yield match.group(1)


class RestObj(object):
    name = None
    id = None

    def __init__(self, conn, **kwargs):
        self.__dict__.update(kwargs)
        self.__connection__ = conn

    def __str__(self):
        res = ["{}({}):".format(self.__class__.__name__, self.name)]
        for k, v in sorted(self.__dict__.items()):
            if k.startswith('__') or k.endswith('__'):
                continue
            if k != 'name':
                res.append("    {}={!r}".format(k, v))
        return "\n".join(res)

    def __getitem__(self, item):
        return getattr(self, item)


def make_call(method, url):
    def closure(obj, entire_obj=None, **data):
        inline_params_vals = {}
        for name in get_inline_param_list(url):
            if name in data:
                inline_params_vals[name] = data[name]
                del data[name]
            else:
                inline_params_vals[name] = getattr(obj, name)
        result_url = url.format(**inline_params_vals)

        if entire_obj is not None:
            if data != {}:
                raise ValueError("Both entire_obj and data provided")
            data = entire_obj
        return obj.__connection__.do(method, result_url, params=data)
    return closure


PUT = partial(make_call, 'put')
GET = partial(make_call, 'get')
DELETE = partial(make_call, 'delete')


def with_timeout(tout, message):
    def closure(func):
        @wraps(func)
        def closure2(*dt, **mp):
            ctime = time.time()
            etime = ctime + tout

            while ctime < etime:
                if func(*dt, **mp):
                    return
                sleep_time = ctime + 1 - time.time()
                if sleep_time > 0:
                    time.sleep(sleep_time)
                ctime = time.time()
            raise RuntimeError("Timeout during " + message)
        return closure2
    return closure


# -------------------------------  ORM ----------------------------------------


def get_fuel_info(url):
    conn = Urllib2HTTP(url)
    return FuelInfo(conn)


class FuelInfo(RestObj):

    """Class represents Fuel installation info"""

    get_nodes = GET('api/nodes')
    get_clusters = GET('api/clusters')
    get_cluster = GET('api/clusters/{id}')
    get_info = GET('api/releases')

    @property
    def nodes(self):
        """Get all fuel nodes"""
        return NodeList([Node(self.__connection__, **node) for node
                         in self.get_nodes()])

    @property
    def free_nodes(self):
        """Get unallocated nodes"""
        return NodeList([Node(self.__connection__, **node) for node in
                         self.get_nodes() if not node['cluster']])

    @property
    def clusters(self):
        """List clusters in fuel"""
        return [Cluster(self.__connection__, **cluster) for cluster
                in self.get_clusters()]

    def get_version(self):
        for info in self.get_info():
            vers = info['version'].split("-")[1].split('.')
            return map(int, vers)
        raise ValueError("No version found")


class Node(RestObj):
    """Represents node in Fuel"""

    get_info = GET('/api/nodes/{id}')
    get_interfaces = GET('/api/nodes/{id}/interfaces')
    update_interfaces = PUT('/api/nodes/{id}/interfaces')

    def set_network_assigment(self, mapping):
        """Assings networks to interfaces
        :param mapping: list (dict) interfaces info
        """

        curr_interfaces = self.get_interfaces()

        network_ids = {}
        for interface in curr_interfaces:
            for net in interface['assigned_networks']:
                network_ids[net['name']] = net['id']

        # transform mappings
        new_assigned_networks = {}

        for dev_name, networks in mapping.items():
            new_assigned_networks[dev_name] = []
            for net_name in networks:
                nnet = {'name': net_name, 'id': network_ids[net_name]}
                new_assigned_networks[dev_name].append(nnet)

        # update by ref
        for dev_descr in curr_interfaces:
            if dev_descr['name'] in new_assigned_networks:
                nass = new_assigned_networks[dev_descr['name']]
                dev_descr['assigned_networks'] = nass

        self.update_interfaces(curr_interfaces, id=self.id)

    def set_node_name(self, name):
        """Update node name"""
        self.__connection__.put('api/nodes', [{'id': self.id, 'name': name}])

    def get_network_data(self):
        """Returns node network data"""
        node_info = self.get_info()
        return node_info.get('network_data')

    def get_roles(self, pending=False):
        """Get node roles

        Returns: (roles, pending_roles)
        """
        node_info = self.get_info()
        if pending:
            return node_info.get('roles'), node_info.get('pending_roles')
        else:
            return node_info.get('roles')

    def get_ip(self, network='public'):
        """Get node ip

        :param network: network to pick
        """
        nets = self.get_network_data()
        for net in nets:
            if net['name'] == network:
                iface_name = net['dev']
                for iface in self.get_info()['meta']['interfaces']:
                    if iface['name'] == iface_name:
                        try:
                            return iface['ip']
                        except KeyError:
                            return netaddr.IPNetwork(net['ip']).ip
        raise Exception('Network %s not found' % network)


class NodeList(list):
    """Class for filtering nodes through attributes"""
    allowed_roles = ['controller', 'compute', 'cinder', 'ceph-osd', 'mongo',
                     'zabbix-server']

    def __getattr__(self, name):
        if name in self.allowed_roles:
            return [node for node in self if name in node.roles]


class Cluster(RestObj):
    """Class represents Cluster in Fuel"""

    add_node_call = PUT('api/nodes')
    start_deploy = PUT('api/clusters/{id}/changes')
    get_status = GET('api/clusters/{id}')
    delete = DELETE('api/clusters/{id}')
    get_tasks_status = GET("api/tasks?cluster_id={id}")
    get_networks = GET(
        'api/clusters/{id}/network_configuration/{net_provider}')

    get_attributes = GET(
        'api/clusters/{id}/attributes')

    set_attributes = PUT(
        'api/clusters/{id}/attributes')

    configure_networks = PUT(
        'api/clusters/{id}/network_configuration/{net_provider}')

    _get_nodes = GET('api/nodes?cluster_id={id}')

    def __init__(self, *dt, **mp):
        super(Cluster, self).__init__(*dt, **mp)
        self.nodes = NodeList([Node(self.__connection__, **node) for node in
                               self._get_nodes()])
        self.network_roles = {}

    def check_exists(self):
        """Check if cluster exists"""
        try:
            self.get_status()
            return True
        except urllib2.HTTPError as err:
            if err.code == 404:
                return False
            raise

    def get_openrc(self):
        access = self.get_attributes()['editable']['access']
        creds = {}
        creds['username'] = access['user']['value']
        creds['password'] = access['password']['value']
        creds['tenant_name'] = access['tenant']['value']
        if self.nodes.controller:
            contr = self.nodes.controller[0]
            creds['os_auth_url'] = "http://%s:5000/v2.0" \
                % contr.get_ip(network="public")
        else:
            creds['os_auth_url'] = ""
        return creds

    def get_nodes(self):
        for node_descr in self._get_nodes():
            yield Node(self.__connection__, **node_descr)

    def add_node(self, node, roles, interfaces=None):
        """Add node to cluster

        :param node: Node object
        :param roles: roles to assign
        :param interfaces: mapping iface name to networks
        """
        data = {}
        data['pending_roles'] = roles
        data['cluster_id'] = self.id
        data['id'] = node.id
        data['pending_addition'] = True

        logger.debug("Adding node %s to cluster..." % node.id)

        self.add_node_call([data])
        self.nodes.append(node)

        if interfaces is not None:
            networks = {}
            for iface_name, params in interfaces.items():
                networks[iface_name] = params['networks']

            node.set_network_assigment(networks)

    def wait_operational(self, timeout):
        """Wait until cluster status operational"""
        def wo():
            status = self.get_status()['status']
            if status == "error":
                raise Exception("Cluster deploy failed")
            return self.get_status()['status'] == 'operational'
        with_timeout(timeout, "deploy cluster")(wo)()

    def deploy(self, timeout):
        """Start deploy and wait until all tasks finished"""
        logger.debug("Starting deploy...")
        self.start_deploy()

        self.wait_operational(timeout)

        def all_tasks_finished_ok(obj):
            ok = True
            for task in obj.get_tasks_status():
                if task['status'] == 'error':
                    raise Exception('Task execution error')
                elif task['status'] != 'ready':
                    ok = False
            return ok

        wto = with_timeout(timeout, "wait deployment finished")
        wto(all_tasks_finished_ok)(self)

    def set_networks(self, net_descriptions):
        """Update cluster networking parameters"""
        configuration = self.get_networks()
        current_networks = configuration['networks']
        parameters = configuration['networking_parameters']

        if net_descriptions.get('networks'):
            net_mapping = net_descriptions['networks']

            for net in current_networks:
                net_desc = net_mapping.get(net['name'])
                if net_desc:
                    net.update(net_desc)

        if net_descriptions.get('networking_parameters'):
            parameters.update(net_descriptions['networking_parameters'])

        self.configure_networks(**configuration)


def reflect_cluster(conn, cluster_id):
    """Returns cluster object by id"""
    c = Cluster(conn, id=cluster_id)
    c.nodes = NodeList(list(c.get_nodes()))
    return c


def get_all_nodes(conn):
    """Get all nodes from Fuel"""
    for node_desc in conn.get('api/nodes'):
        yield Node(conn, **node_desc)


def get_all_clusters(conn):
    """Get all clusters"""
    for cluster_desc in conn.get('api/clusters'):
        yield Cluster(conn, **cluster_desc)


def get_cluster_id(conn, name):
    """Get cluster id by name"""
    for cluster in get_all_clusters(conn):
        if cluster.name == name:
            return cluster.id

    raise ValueError("Cluster {0} not found".format(name))


sections = {
    'sahara': 'additional_components',
    'murano': 'additional_components',
    'ceilometer': 'additional_components',
    'volumes_ceph': 'storage',
    'images_ceph': 'storage',
    'ephemeral_ceph': 'storage',
    'objects_ceph': 'storage',
    'osd_pool_size': 'storage',
    'volumes_lvm': 'storage',
    'volumes_vmdk': 'storage',
    'tenant': 'access',
    'password': 'access',
    'user': 'access',
    'vc_password': 'vcenter',
    'cluster': 'vcenter',
    'host_ip': 'vcenter',
    'vc_user': 'vcenter',
    'use_vcenter': 'vcenter',
}


def create_empty_cluster(conn, cluster_desc, debug_mode=False):
    """Create new cluster with configuration provided"""

    data = {}
    data['nodes'] = []
    data['tasks'] = []
    data['name'] = cluster_desc['name']
    data['release'] = cluster_desc['release']
    data['mode'] = cluster_desc.get('deployment_mode')
    data['net_provider'] = cluster_desc.get('net_provider')

    params = conn.post(path='/api/clusters', params=data)
    cluster = Cluster(conn, **params)

    attributes = cluster.get_attributes()

    ed_attrs = attributes['editable']

    ed_attrs['common']['libvirt_type']['value'] = \
        cluster_desc.get('libvirt_type', 'kvm')

    if 'nodes' in cluster_desc:
        use_ceph = cluster_desc['nodes'].get('ceph_osd', None) is not None
    else:
        use_ceph = False

    if 'storage_type' in cluster_desc:
        st = cluster_desc['storage_type']
        if st == 'ceph':
            use_ceph = True
        else:
            use_ceph = False

    if use_ceph:
        opts = ['ephemeral_ceph', 'images_ceph', 'images_vcenter']
        opts += ['iser', 'objects_ceph', 'volumes_ceph']
        opts += ['volumes_lvm', 'volumes_vmdk']

        for name in opts:
            val = ed_attrs['storage'][name]
            if val['type'] == 'checkbox':
                is_ceph = ('images_ceph' == name)
                is_ceph = is_ceph or ('volumes_ceph' == name)

                if is_ceph:
                    val['value'] = True
                else:
                    val['value'] = False
    # else:
    #     raise NotImplementedError("Non-ceph storages are not implemented")

    cluster.set_attributes(attributes)

    return cluster