#!/usr/bin/python
import sys

from glance_utils import (
    do_openstack_upgrade,
    ensure_ceph_pool,
    migrate_database,
    register_configs,
    restart_map,
    CLUSTER_RES,
    PACKAGES,
    SERVICES,
    CHARM,
    GLANCE_REGISTRY_CONF,
    GLANCE_REGISTRY_PASTE_INI,
    GLANCE_API_CONF,
    GLANCE_API_PASTE_INI,
    HAPROXY_CONF,
    ceph_config_file)

from charmhelpers.core.hookenv import (
    config,
    Hooks,
    log as juju_log,
    ERROR,
    open_port,
    is_relation_made,
    relation_get,
    relation_set,
    relation_ids,
    service_name,
    unit_get,
    UnregisteredHookError, )

from charmhelpers.core.host import (
    mkdir,
    restart_on_change,
    service_stop
)

from charmhelpers.fetch import apt_install, apt_update

from charmhelpers.contrib.hahelpers.cluster import (
    canonical_url, eligible_leader)

from charmhelpers.contrib.openstack.utils import (
    configure_installation_source,
    get_os_codename_package,
    openstack_upgrade_available,
    lsb_release, )

from charmhelpers.contrib.storage.linux.ceph import ensure_ceph_keyring
from charmhelpers.payload.execd import execd_preinstall

from subprocess import (
    check_call,
    call, )

hooks = Hooks()

CONFIGS = register_configs()


@hooks.hook('install')
def install_hook():
    juju_log('Installing glance packages')
    execd_preinstall()
    src = config('openstack-origin')
    if (lsb_release()['DISTRIB_CODENAME'] == 'precise' and
       src == 'distro'):
        src = 'cloud:precise-folsom'

    configure_installation_source(src)

    apt_update()
    apt_install(PACKAGES)

    for service in SERVICES:
        service_stop(service)


@hooks.hook('shared-db-relation-joined')
def db_joined():
    if is_relation_made('pgsql-db'):
        # error, postgresql is used
        e = ('Attempting to associate a mysql database when there is already '
             'associated a postgresql one')
        juju_log(e, level=ERROR)
        raise Exception(e)

    relation_set(database=config('database'), username=config('database-user'),
                 hostname=unit_get('private-address'))


@hooks.hook('pgsql-db-relation-joined')
def pgsql_db_joined():
    if is_relation_made('shared-db'):
        # raise error
        e = ('Attempting to associate a postgresql database when there is already '
             'associated a mysql one')
        juju_log(e, level=ERROR)
        raise Exception(e)

    relation_set(database=config('database'))


@hooks.hook('shared-db-relation-changed')
@restart_on_change(restart_map())
def db_changed():
    rel = get_os_codename_package("glance-common")

    if 'shared-db' not in CONFIGS.complete_contexts():
        juju_log('shared-db relation incomplete. Peer not ready?')
        return

    CONFIGS.write(GLANCE_REGISTRY_CONF)
    # since folsom, a db connection setting in glance-api.conf is required.
    if rel != "essex":
        CONFIGS.write(GLANCE_API_CONF)

    if eligible_leader(CLUSTER_RES):
        if rel == "essex":
            status = call(['glance-manage', 'db_version'])
            if status != 0:
                juju_log('Setting version_control to 0')
                check_call(["glance-manage", "version_control", "0"])

        juju_log('Cluster leader, performing db sync')
        migrate_database()


@hooks.hook('pgsql-db-relation-changed')
@restart_on_change(restart_map())
def pgsql_db_changed():
    rel = get_os_codename_package("glance-common")

    if 'pgsql-db' not in CONFIGS.complete_contexts():
        juju_log('pgsql-db relation incomplete. Peer not ready?')
        return

    CONFIGS.write(GLANCE_REGISTRY_CONF)
    # since folsom, a db connection setting in glance-api.conf is required.
    if rel != "essex":
        CONFIGS.write(GLANCE_API_CONF)

    if eligible_leader(CLUSTER_RES):
        if rel == "essex":
            status = call(['glance-manage', 'db_version'])
            if status != 0:
                juju_log('Setting version_control to 0')
                check_call(["glance-manage", "version_control", "0"])

        juju_log('Cluster leader, performing db sync')
        migrate_database()


@hooks.hook('image-service-relation-joined')
def image_service_joined(relation_id=None):
    if not eligible_leader(CLUSTER_RES):
        return

    relation_data = {
        'glance-api-server': canonical_url(CONFIGS) + ":9292"
    }

    juju_log("%s: image-service_joined: To peer glance-api-server=%s" %
             (CHARM, relation_data['glance-api-server']))

    relation_set(relation_id=relation_id, **relation_data)


@hooks.hook('object-store-relation-joined')
@restart_on_change(restart_map())
def object_store_joined():

    if 'identity-service' not in CONFIGS.complete_contexts():
        juju_log('Deferring swift storage configuration until '
                 'an identity-service relation exists')
        return

    if 'object-store' not in CONFIGS.complete_contexts():
        juju_log('swift relation incomplete')
        return

    CONFIGS.write(GLANCE_API_CONF)


@hooks.hook('ceph-relation-joined')
def ceph_joined():
    apt_install(['ceph-common', 'python-ceph'])


@hooks.hook('ceph-relation-changed')
@restart_on_change(restart_map())
def ceph_changed():
    if 'ceph' not in CONFIGS.complete_contexts():
        juju_log('ceph relation incomplete. Peer not ready?')
        return

    service = service_name()

    if not ensure_ceph_keyring(service=service,
                               user='glance', group='glance'):
        juju_log('Could not create ceph keyring: peer not ready?')
        return

    CONFIGS.write(GLANCE_API_CONF)
    CONFIGS.write(ceph_config_file())

    if eligible_leader(CLUSTER_RES):
        _config = config()
        ensure_ceph_pool(service=service,
                         replicas=_config['ceph-osd-replication-count'])


@hooks.hook('identity-service-relation-joined')
def keystone_joined(relation_id=None):
    if not eligible_leader(CLUSTER_RES):
        juju_log('Deferring keystone_joined() to service leader.')
        return

    url = canonical_url(CONFIGS) + ":9292"
    relation_data = {
        'service': 'glance',
        'region': config('region'),
        'public_url': url,
        'admin_url': url,
        'internal_url': url, }

    relation_set(relation_id=relation_id, **relation_data)


@hooks.hook('identity-service-relation-changed')
@restart_on_change(restart_map())
def keystone_changed():
    if 'identity-service' not in CONFIGS.complete_contexts():
        juju_log('identity-service relation incomplete. Peer not ready?')
        return

    CONFIGS.write(GLANCE_API_CONF)
    CONFIGS.write(GLANCE_REGISTRY_CONF)

    CONFIGS.write(GLANCE_API_PASTE_INI)
    CONFIGS.write(GLANCE_REGISTRY_PASTE_INI)

    # Configure any object-store / swift relations now that we have an
    # identity-service
    if relation_ids('object-store'):
        object_store_joined()

    # possibly configure HTTPS for API and registry
    configure_https()


@hooks.hook('config-changed')
@restart_on_change(restart_map(), stopstart=True)
def config_changed():
    if openstack_upgrade_available('glance-common'):
        juju_log('Upgrading OpenStack release')
        do_openstack_upgrade(CONFIGS)

    open_port(9292)
    configure_https()

    #env_vars = {'OPENSTACK_PORT_MCASTPORT': config("ha-mcastport"),
    #            'OPENSTACK_SERVICE_API': "glance-api",
    #            'OPENSTACK_SERVICE_REGISTRY': "glance-registry"}
    #save_script_rc(**env_vars)


@hooks.hook('cluster-relation-changed')
@restart_on_change(restart_map(), stopstart=True)
def cluster_changed():
    configure_https()
    CONFIGS.write(GLANCE_API_CONF)
    CONFIGS.write(HAPROXY_CONF)


@hooks.hook('upgrade-charm')
def upgrade_charm():
    cluster_changed()


@hooks.hook('ha-relation-joined')
def ha_relation_joined():
    corosync_bindiface = config("ha-bindiface")
    corosync_mcastport = config("ha-mcastport")
    vip = config("vip")
    vip_iface = config("vip_iface")
    vip_cidr = config("vip_cidr")

    #if vip and vip_iface and vip_cidr and \
    #    corosync_bindiface and corosync_mcastport:

    resources = {
        'res_glance_vip': 'ocf:heartbeat:IPaddr2',
        'res_glance_haproxy': 'lsb:haproxy', }

    resource_params = {
        'res_glance_vip': 'params ip="%s" cidr_netmask="%s" nic="%s"' %
                          (vip, vip_cidr, vip_iface),
        'res_glance_haproxy': 'op monitor interval="5s"', }

    init_services = {
        'res_glance_haproxy': 'haproxy', }

    clones = {
        'cl_glance_haproxy': 'res_glance_haproxy', }

    relation_set(init_services=init_services,
                 corosync_bindiface=corosync_bindiface,
                 corosync_mcastport=corosync_mcastport,
                 resources=resources,
                 resource_params=resource_params,
                 clones=clones)


@hooks.hook('ha-relation-changed')
def ha_relation_changed():
    clustered = relation_get('clustered')
    if not clustered or clustered in [None, 'None', '']:
        juju_log('ha_changed: hacluster subordinate is not fully clustered.')
        return
    if not eligible_leader(CLUSTER_RES):
        juju_log('ha_changed: hacluster complete but we are not leader.')
        return

    # reconfigure endpoint in keystone to point to clustered VIP.
    [keystone_joined(rid) for rid in relation_ids('identity-service')]

    # notify glance client services of reconfigured URL.
    [image_service_joined(rid) for rid in relation_ids('image-service')]


@hooks.hook('ceph-relation-broken',
            'identity-service-relation-broken',
            'object-store-relation-broken',
            'shared-db-relation-broken',
            'pgsql-db-relation-broken')
def relation_broken():
    CONFIGS.write_all()


def configure_https():
    '''Enables SSL API Apache config if appropriate and kicks
    identity-service and image-service with any required
    updates
    '''
    CONFIGS.write_all()
    if 'https' in CONFIGS.complete_contexts():
        cmd = ['a2ensite', 'openstack_https_frontend']
        check_call(cmd)
    else:
        cmd = ['a2dissite', 'openstack_https_frontend']
        check_call(cmd)

    for r_id in relation_ids('identity-service'):
        keystone_joined(relation_id=r_id)
    for r_id in relation_ids('image-service'):
        image_service_joined(relation_id=r_id)


@hooks.hook('amqp-relation-joined')
def amqp_joined():
    conf = config()
    relation_set(username=conf['rabbit-user'], vhost=conf['rabbit-vhost'])


@hooks.hook('amqp-relation-changed')
@restart_on_change(restart_map())
def amqp_changed():
    if 'amqp' not in CONFIGS.complete_contexts():
        juju_log('amqp relation incomplete. Peer not ready?')
        return
    CONFIGS.write(GLANCE_API_CONF)

if __name__ == '__main__':
    try:
        hooks.execute(sys.argv)
    except UnregisteredHookError as e:
        juju_log('Unknown hook {} - skipping.'.format(e))