# -*- coding: utf-8 -*-
# pylint: disable=unused-argument
# pylint: disable=too-many-statements,too-many-branches

import logging
import math
from datetime import datetime
from functools import partial

import cherrypy
import rbd

from .. import mgr
from ..controllers.pool import RBDPool
from ..exceptions import DashboardException
from ..security import Scope
from ..services.ceph_service import CephService
from ..services.exception import handle_rados_error, handle_rbd_error, serialize_dashboard_exception
from ..services.rbd import MIRROR_IMAGE_MODE, RbdConfiguration, \
    RbdImageMetadataService, RbdMirroringService, RbdService, \
    RbdSnapshotService, format_bitmask, format_features, get_image_spec, \
    parse_image_spec, rbd_call, rbd_image_call
from ..tools import ViewCache, str_to_bool
from . import APIDoc, APIRouter, BaseController, CreatePermission, \
    DeletePermission, Endpoint, EndpointDoc, ReadPermission, RESTController, \
    Task, UIRouter, UpdatePermission, allow_empty_body
from ._version import APIVersion

logger = logging.getLogger(__name__)

RBD_SCHEMA = ([{
    "value": ([str], ''),
    "pool_name": (str, 'pool name')
}])

RBD_TRASH_SCHEMA = [{
    "status": (int, ''),
    "value": ([str], ''),
    "pool_name": (str, 'pool name')
}]


# pylint: disable=not-callable
def RbdTask(name, metadata, wait_for):  # noqa: N802
    def composed_decorator(func):
        func = handle_rados_error('pool')(func)
        func = handle_rbd_error()(func)
        return Task("rbd/{}".format(name), metadata, wait_for,
                    partial(serialize_dashboard_exception, include_http_status=True))(func)
    return composed_decorator


@APIRouter('/block/image', Scope.RBD_IMAGE)
@APIDoc("RBD Management API", "Rbd")
class Rbd(RESTController):

    DEFAULT_LIMIT = 5

    def _rbd_list(self, pool_name=None, offset=0, limit=DEFAULT_LIMIT, search='', sort=''):
        if pool_name:
            pools = [pool_name]
        else:
            pools = [p['pool_name'] for p in CephService.get_pool_list('rbd')]

        images, num_total_images = RbdService.rbd_pool_list(
            pools, offset=offset, limit=limit, search=search, sort=sort)
        cherrypy.response.headers['X-Total-Count'] = num_total_images
        pool_result = {}
        for i, image in enumerate(images):
            pool = image['pool_name']
            if pool not in pool_result:
                pool_result[pool] = {'value': [], 'pool_name': image['pool_name']}
            pool_result[pool]['value'].append(image)

            images[i]['configuration'] = RbdConfiguration(
                pool, image['namespace'], image['name']).list()
            images[i]['metadata'] = rbd_image_call(
                pool, image['namespace'], image['name'],
                lambda ioctx, image: RbdImageMetadataService(image).list())

        return list(pool_result.values())

    @handle_rbd_error()
    @handle_rados_error('pool')
    @EndpointDoc("Display Rbd Images",
                 parameters={
                     'pool_name': (str, 'Pool Name'),
                     'limit': (int, 'limit'),
                     'offset': (int, 'offset'),
                 },
                 responses={200: RBD_SCHEMA})
    @RESTController.MethodMap(version=APIVersion(2, 0))  # type: ignore
    def list(self, pool_name=None, offset: int = 0, limit: int = DEFAULT_LIMIT,
             search: str = '', sort: str = ''):
        return self._rbd_list(pool_name, offset=int(offset), limit=int(limit),
                              search=search, sort=sort)

    @handle_rbd_error()
    @handle_rados_error('pool')
    @EndpointDoc("Get Rbd Image Info",
                 parameters={
                     'image_spec': (str, 'URL-encoded "pool/rbd_name". e.g. "rbd%2Ffoo"'),
                     'omit_usage': (bool, 'When true, usage information is not returned'),
                 },
                 responses={200: RBD_SCHEMA})
    def get(self, image_spec, omit_usage=False):
        try:
            omit_usage_bool = str_to_bool(omit_usage)
        except ValueError:
            omit_usage_bool = False
        return RbdService.get_image(image_spec, omit_usage_bool)

    @RbdTask('create',
             {'pool_name': '{pool_name}', 'namespace': '{namespace}', 'image_name': '{name}'}, 2.0)
    def create(self, name, pool_name, size, namespace=None, schedule_interval='',
               obj_size=None, features=None, stripe_unit=None, stripe_count=None,
               data_pool=None, configuration=None, metadata=None,
               mirror_mode=None):

        RbdService.create(name, pool_name, size, namespace,
                          obj_size, features, stripe_unit, stripe_count,
                          data_pool, configuration, metadata)

        if mirror_mode:
            RbdMirroringService.enable_image(name, pool_name, namespace,
                                             MIRROR_IMAGE_MODE[mirror_mode])

        if schedule_interval:
            image_spec = get_image_spec(pool_name, namespace, name)
            RbdMirroringService.snapshot_schedule_add(image_spec, schedule_interval)

    @RbdTask('delete', ['{image_spec}'], 2.0)
    def delete(self, image_spec):
        return RbdService.delete(image_spec)

    @RbdTask('edit', ['{image_spec}', '{name}'], 4.0)
    def set(self, image_spec, name=None, size=None, features=None,
            configuration=None, metadata=None, enable_mirror=None, primary=None,
            force=False, resync=False, mirror_mode=None, schedule_interval='',
            remove_scheduling=False):
        return RbdService.set(image_spec, name, size, features,
                              configuration, metadata, enable_mirror, primary,
                              force, resync, mirror_mode, schedule_interval,
                              remove_scheduling)

    @RbdTask('copy',
             {'src_image_spec': '{image_spec}',
              'dest_pool_name': '{dest_pool_name}',
              'dest_namespace': '{dest_namespace}',
              'dest_image_name': '{dest_image_name}'}, 2.0)
    @RESTController.Resource('POST')
    @allow_empty_body
    def copy(self, image_spec, dest_pool_name, dest_namespace, dest_image_name,
             snapshot_name=None, obj_size=None, features=None,
             stripe_unit=None, stripe_count=None, data_pool=None,
             configuration=None, metadata=None):
        return RbdService.copy(image_spec, dest_pool_name, dest_namespace, dest_image_name,
                               snapshot_name, obj_size, features,
                               stripe_unit, stripe_count, data_pool,
                               configuration, metadata)

    @RbdTask('flatten', ['{image_spec}'], 2.0)
    @RESTController.Resource('POST')
    @UpdatePermission
    @allow_empty_body
    def flatten(self, image_spec):
        return RbdService.flatten(image_spec)

    @RESTController.Collection('GET')
    def default_features(self):
        rbd_default_features = mgr.get('config')['rbd_default_features']
        return format_bitmask(int(rbd_default_features))

    @RESTController.Collection('GET')
    def clone_format_version(self):
        """Return the RBD clone format version.
        """
        rbd_default_clone_format = mgr.get('config')['rbd_default_clone_format']
        if rbd_default_clone_format != 'auto':
            return int(rbd_default_clone_format)
        osd_map = mgr.get_osdmap().dump()
        min_compat_client = osd_map.get('min_compat_client', '')
        require_min_compat_client = osd_map.get('require_min_compat_client', '')
        if max(min_compat_client, require_min_compat_client) < 'mimic':
            return 1

        return 2

    @RbdTask('trash/move', ['{image_spec}'], 2.0)
    @RESTController.Resource('POST')
    @allow_empty_body
    def move_trash(self, image_spec, delay=0):
        """Move an image to the trash.
        Images, even ones actively in-use by clones,
        can be moved to the trash and deleted at a later time.
        """
        return RbdService.move_image_to_trash(image_spec, delay)


@UIRouter('/block/rbd')
class RbdStatus(BaseController):
    @EndpointDoc("Display RBD Image feature status")
    @Endpoint()
    @ReadPermission
    def status(self):
        status = {'available': True, 'message': None}
        if not CephService.get_pool_list('rbd'):
            status['available'] = False
            status['message'] = 'No Block Pool is available in the cluster. Please click ' \
                                'on \"Configure Default Pool\" button to ' \
                                'get started.'  # type: ignore
        return status

    @Endpoint('POST')
    @EndpointDoc('Configure Default Block Pool')
    @CreatePermission
    def configure(self):
        rbd_pool = RBDPool()

        if not CephService.get_pool_list('rbd'):
            rbd_pool.create('rbd')


@APIRouter('/block/image/{image_spec}/snap', Scope.RBD_IMAGE)
@APIDoc("RBD Snapshot Management API", "RbdSnapshot")
class RbdSnapshot(RESTController):

    RESOURCE_ID = "snapshot_name"

    @RbdTask('snap/create',
             ['{image_spec}', '{snapshot_name}', '{mirrorImageSnapshot}'], 2.0)
    def create(self, image_spec, snapshot_name, mirrorImageSnapshot):
        pool_name, namespace, image_name = parse_image_spec(image_spec)

        def _create_snapshot(ioctx, img, snapshot_name):
            mirror_info = img.mirror_image_get_info()
            mirror_mode = img.mirror_image_get_mode()
            if (mirror_info['state'] == rbd.RBD_MIRROR_IMAGE_ENABLED and mirror_mode == rbd.RBD_MIRROR_IMAGE_MODE_SNAPSHOT) and mirrorImageSnapshot:  # noqa E501 #pylint: disable=line-too-long
                img.mirror_image_create_snapshot()
            else:
                img.create_snap(snapshot_name)

        return rbd_image_call(pool_name, namespace, image_name, _create_snapshot,
                              snapshot_name)

    @RbdTask('snap/delete',
             ['{image_spec}', '{snapshot_name}'], 2.0)
    def delete(self, image_spec, snapshot_name):
        return RbdSnapshotService.remove_snapshot(image_spec, snapshot_name)

    @RbdTask('snap/edit',
             ['{image_spec}', '{snapshot_name}'], 4.0)
    def set(self, image_spec, snapshot_name, new_snap_name=None,
            is_protected=None):
        def _edit(ioctx, img, snapshot_name):
            if new_snap_name and new_snap_name != snapshot_name:
                img.rename_snap(snapshot_name, new_snap_name)
                snapshot_name = new_snap_name
            if is_protected is not None and \
                    is_protected != img.is_protected_snap(snapshot_name):
                if is_protected:
                    img.protect_snap(snapshot_name)
                else:
                    img.unprotect_snap(snapshot_name)

        pool_name, namespace, image_name = parse_image_spec(image_spec)
        return rbd_image_call(pool_name, namespace, image_name, _edit, snapshot_name)

    @RbdTask('snap/rollback',
             ['{image_spec}', '{snapshot_name}'], 5.0)
    @RESTController.Resource('POST')
    @UpdatePermission
    @allow_empty_body
    def rollback(self, image_spec, snapshot_name):
        def _rollback(ioctx, img, snapshot_name):
            img.rollback_to_snap(snapshot_name)

        pool_name, namespace, image_name = parse_image_spec(image_spec)
        return rbd_image_call(pool_name, namespace, image_name, _rollback, snapshot_name)

    @RbdTask('clone',
             {'parent_image_spec': '{image_spec}',
              'child_pool_name': '{child_pool_name}',
              'child_namespace': '{child_namespace}',
              'child_image_name': '{child_image_name}'}, 2.0)
    @RESTController.Resource('POST')
    @allow_empty_body
    def clone(self, image_spec, snapshot_name, child_pool_name,
              child_image_name, child_namespace=None, obj_size=None, features=None,
              stripe_unit=None, stripe_count=None, data_pool=None,
              configuration=None, metadata=None):
        """
        Clones a snapshot to an image
        """

        pool_name, namespace, image_name = parse_image_spec(image_spec)

        def _parent_clone(p_ioctx):
            def _clone(ioctx):
                # Set order
                l_order = None
                if obj_size and obj_size > 0:
                    l_order = int(round(math.log(float(obj_size), 2)))

                # Set features
                feature_bitmask = format_features(features)

                rbd_inst = rbd.RBD()
                rbd_inst.clone(p_ioctx, image_name, snapshot_name, ioctx,
                               child_image_name, feature_bitmask, l_order,
                               stripe_unit, stripe_count, data_pool)

                RbdConfiguration(pool_ioctx=ioctx, image_name=child_image_name).set_configuration(
                    configuration)
                if metadata:
                    with rbd.Image(ioctx, child_image_name) as image:
                        RbdImageMetadataService(image).set_metadata(metadata)

            return rbd_call(child_pool_name, child_namespace, _clone)

        rbd_call(pool_name, namespace, _parent_clone)


@APIRouter('/block/image/trash', Scope.RBD_IMAGE)
@APIDoc("RBD Trash Management API", "RbdTrash")
class RbdTrash(RESTController):
    RESOURCE_ID = "image_id_spec"

    def __init__(self):
        super().__init__()
        self.rbd_inst = rbd.RBD()

    @ViewCache()
    def _trash_pool_list(self, pool_name):
        with mgr.rados.open_ioctx(pool_name) as ioctx:
            result = []
            namespaces = self.rbd_inst.namespace_list(ioctx)
            # images without namespace
            namespaces.append('')
            for namespace in namespaces:
                ioctx.set_namespace(namespace)
                images = self.rbd_inst.trash_list(ioctx)
                for trash in images:
                    trash['pool_name'] = pool_name
                    trash['namespace'] = namespace
                    trash['deletion_time'] = "{}Z".format(trash['deletion_time'].isoformat())
                    trash['deferment_end_time'] = "{}Z".format(
                        trash['deferment_end_time'].isoformat())
                    result.append(trash)
            return result

    def _trash_list(self, pool_name=None):
        if pool_name:
            pools = [pool_name]
        else:
            pools = [p['pool_name'] for p in CephService.get_pool_list('rbd')]

        result = []
        for pool in pools:
            # pylint: disable=unbalanced-tuple-unpacking
            status, value = self._trash_pool_list(pool)
            result.append({'status': status, 'value': value, 'pool_name': pool})
        return result

    @handle_rbd_error()
    @handle_rados_error('pool')
    @EndpointDoc("Get RBD Trash Details by pool name",
                 parameters={
                     'pool_name': (str, 'Name of the pool'),
                 },
                 responses={200: RBD_TRASH_SCHEMA})
    def list(self, pool_name=None):
        """List all entries from trash."""
        return self._trash_list(pool_name)

    @handle_rbd_error()
    @handle_rados_error('pool')
    @RbdTask('trash/purge', ['{pool_name}'], 2.0)
    @RESTController.Collection('POST', query_params=['pool_name'])
    @DeletePermission
    @allow_empty_body
    def purge(self, pool_name=None):
        """Remove all expired images from trash."""
        now = "{}Z".format(datetime.utcnow().isoformat())
        pools = self._trash_list(pool_name)

        for pool in pools:
            for image in pool['value']:
                if image['deferment_end_time'] < now:
                    logger.info('Removing trash image %s (pool=%s, namespace=%s, name=%s)',
                                image['id'], pool['pool_name'], image['namespace'], image['name'])
                    rbd_call(pool['pool_name'], image['namespace'],
                             self.rbd_inst.trash_remove, image['id'], 0)

    @RbdTask('trash/restore', ['{image_id_spec}', '{new_image_name}'], 2.0)
    @RESTController.Resource('POST')
    @CreatePermission
    @allow_empty_body
    def restore(self, image_id_spec, new_image_name):
        """Restore an image from trash."""
        pool_name, namespace, image_id = parse_image_spec(image_id_spec)
        return rbd_call(pool_name, namespace, self.rbd_inst.trash_restore, image_id,
                        new_image_name)

    @RbdTask('trash/remove', ['{image_id_spec}'], 2.0)
    def delete(self, image_id_spec, force=False):
        """Delete an image from trash.
        If image deferment time has not expired you can not removed it unless use force.
        But an actively in-use by clones or has snapshots can not be removed.
        """
        pool_name, namespace, image_id = parse_image_spec(image_id_spec)
        return rbd_call(pool_name, namespace, self.rbd_inst.trash_remove, image_id,
                        int(str_to_bool(force)))


@APIRouter('/block/pool/{pool_name}/namespace', Scope.RBD_IMAGE)
@APIDoc("RBD Namespace Management API", "RbdNamespace")
class RbdNamespace(RESTController):

    def __init__(self):
        super().__init__()
        self.rbd_inst = rbd.RBD()

    def create(self, pool_name, namespace):
        with mgr.rados.open_ioctx(pool_name) as ioctx:
            namespaces = self.rbd_inst.namespace_list(ioctx)
            if namespace in namespaces:
                raise DashboardException(
                    msg='Namespace already exists',
                    code='namespace_already_exists',
                    component='rbd')
            return self.rbd_inst.namespace_create(ioctx, namespace)

    def delete(self, pool_name, namespace):
        with mgr.rados.open_ioctx(pool_name) as ioctx:
            # pylint: disable=unbalanced-tuple-unpacking
            images, _ = RbdService.rbd_pool_list([pool_name], namespace=namespace)
            if images:
                raise DashboardException(
                    msg='Namespace contains images which must be deleted first',
                    code='namespace_contains_images',
                    component='rbd')
            return self.rbd_inst.namespace_remove(ioctx, namespace)

    def list(self, pool_name):
        with mgr.rados.open_ioctx(pool_name) as ioctx:
            result = []
            namespaces = self.rbd_inst.namespace_list(ioctx)
            for namespace in namespaces:
                # pylint: disable=unbalanced-tuple-unpacking
                images, _ = RbdService.rbd_pool_list([pool_name], namespace=namespace)
                result.append({
                    'namespace': namespace,
                    'num_images': len(images) if images else 0
                })
            return result
