# Copyright 2014 Huawei Technologies Co. Ltd
#
# 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.

"""Metadata related object holder."""
import logging

from compass.db.api import database
from compass.db.api import metadata as metadata_api
from compass.db.api import permission
from compass.db.api import user as user_api
from compass.db.api import utils
from compass.db import exception
from compass.utils import setting_wrapper as setting
from compass.utils import util


RESP_METADATA_FIELDS = [
    'os_config', 'package_config', 'flavor_config'
]


@database.run_in_session()
def load_metadatas(session):
    load_os_metadatas_internal(session)
    load_package_metadatas_internal(session)
    load_flavor_metadatas_internal(session)


def load_os_metadatas_internal(session):
    global OS_METADATA_MAPPING
    logging.info('load os metadatas into memory')
    OS_METADATA_MAPPING = metadata_api.get_os_metadatas_internal(session)


def load_package_metadatas_internal(session):
    global PACKAGE_METADATA_MAPPING
    logging.info('load package metadatas into memory')
    PACKAGE_METADATA_MAPPING = (
        metadata_api.get_package_metadatas_internal(session)
    )


def load_flavor_metadatas_internal(session):
    global FLAVOR_METADATA_MAPPING
    logging.info('load flavor metadatas into memory')
    FLAVOR_METADATA_MAPPING = (
        metadata_api.get_flavor_metadatas_internal(session)
    )


OS_METADATA_MAPPING = {}
PACKAGE_METADATA_MAPPING = {}
FLAVOR_METADATA_MAPPING = {}


def _validate_config(
    config, id, id_name, metadata_mapping, whole_check, **kwargs
):
    if id not in metadata_mapping:
        raise exception.InvalidParameter(
            '%s id %s is not found in metadata mapping' % (id_name, id)
        )
    metadatas = metadata_mapping[id]
    metadata_api.validate_config_internal(
        config, metadatas, whole_check, **kwargs
    )


def validate_os_config(
    session, config, os_id, whole_check=False, **kwargs
):
    if not OS_METADATA_MAPPING:
        load_os_metadatas_internal(session)
    _validate_config(
        config, os_id, 'os', OS_METADATA_MAPPING,
        whole_check, session=session, **kwargs
    )


def validate_package_config(
    session, config, adapter_id, whole_check=False, **kwargs
):
    if not PACKAGE_METADATA_MAPPING:
        load_package_metadatas_internal(session)
    _validate_config(
        config, adapter_id, 'adapter', PACKAGE_METADATA_MAPPING,
        whole_check, session=session, **kwargs
    )


def _filter_metadata(metadata, **kwargs):
    if not isinstance(metadata, dict):
        return metadata
    filtered_metadata = {}
    for key, value in metadata.items():
        if key == '_self':
            filtered_metadata[key] = {
                'name': value['name'],
                'description': value.get('description', None),
                'default_value': value.get('default_value', None),
                'is_required': value.get('is_required', False),
                'required_in_whole_config': value.get(
                    'required_in_whole_config', False),
                'js_validator': value.get('js_validator', None),
                'options': value.get('options', None),
                'required_in_options': value.get(
                    'required_in_options', False),
                'field_type': value.get(
                    'field_type_data', 'str'),
                'display_type': value.get('display_type', None),
                'mapping_to': value.get('mapping_to', None)
            }
        else:
            filtered_metadata[key] = _filter_metadata(value, **kwargs)
    return filtered_metadata


def get_package_metadata_internal(session, adapter_id):
    """get package metadata internal."""
    if not PACKAGE_METADATA_MAPPING:
        load_package_metadatas_internal(session)
    if adapter_id not in PACKAGE_METADATA_MAPPING:
        raise exception.RecordNotExists(
            'adpater %s does not exist' % adapter_id
        )
    return _filter_metadata(
        PACKAGE_METADATA_MAPPING[adapter_id], session=session
    )


@utils.supported_filters([])
@database.run_in_session()
@user_api.check_user_permission_in_session(
    permission.PERMISSION_LIST_METADATAS
)
@utils.wrap_to_dict(RESP_METADATA_FIELDS)
def get_package_metadata(adapter_id, user=None, session=None, **kwargs):
    return {
        'package_config': get_package_metadata_internal(session, adapter_id)
    }


def get_flavor_metadata_internal(session, flavor_id):
    """get flavor metadata internal."""
    if not FLAVOR_METADATA_MAPPING:
        load_flavor_metadatas_internal(session)
    if flavor_id not in FLAVOR_METADATA_MAPPING:
        raise exception.RecordNotExists(
            'flavor %s does not exist' % flavor_id
        )
    return _filter_metadata(
        FLAVOR_METADATA_MAPPING[flavor_id], session=session
    )


@utils.supported_filters([])
@database.run_in_session()
@user_api.check_user_permission_in_session(
    permission.PERMISSION_LIST_METADATAS
)
@utils.wrap_to_dict(RESP_METADATA_FIELDS)
def get_flavor_metadata(flavor_id, user=None, session=None, **kwargs):
    return {
        'flavor_config': get_flavor_metadata_internal(session, flavor_id)
    }


def get_os_metadata_internal(session, os_id):
    """get os metadata internal."""
    if not OS_METADATA_MAPPING:
        load_os_metadatas_internal(session)
    if os_id not in OS_METADATA_MAPPING:
        raise exception.RecordNotExists(
            'os %s does not exist' % os_id
        )
    return _filter_metadata(
        OS_METADATA_MAPPING[os_id], session=session
    )


@utils.supported_filters([])
@database.run_in_session()
@user_api.check_user_permission_in_session(
    permission.PERMISSION_LIST_METADATAS
)
@utils.wrap_to_dict(RESP_METADATA_FIELDS)
def get_os_metadata(os_id, user=None, session=None, **kwargs):
    """get os metadatas."""
    return {'os_config': get_os_metadata_internal(session, os_id)}


def get_ui_metadata(metadata, config):
    """convert os_metadata to ui os_metadata."""
    result_config = {}
    result_config[config['mapped_name']] = []
    for mapped_child in config['mapped_children']:
        data_dict = {}
        for config_key, config_value in mapped_child.items():
            for key, value in config_value.items():
                if 'data' == key:
                    result_data = []
                    _get_data(metadata[config_key], value, result_data)
                    data_dict['data'] = result_data
                else:
                    data_dict[key] = value
        result_config[config['mapped_name']].append(data_dict)
    return result_config


def _get_data(metadata, config, result_data):
    data_dict = {}
    for key, config_value in config.items():
        if isinstance(config_value, dict) and key != 'content_data':
            if key in metadata.keys():
                _get_data(metadata[key], config_value, result_data)
            else:
                _get_data(metadata, config_value, result_data)
        elif isinstance(config_value, list):
            option_list = []
            for item in config_value:
                if isinstance(item, dict):
                    option_list.append(item)
                    data_dict[key] = option_list
                else:
                    if isinstance(metadata['_self'][item], bool):
                        data_dict[item] = str(metadata['_self'][item]).lower()
                    else:
                        data_dict[item] = metadata['_self'][item]
        else:
            data_dict[key] = config_value
    if data_dict:
        result_data.append(data_dict)
    return result_data


@utils.supported_filters([])
@database.run_in_session()
@user_api.check_user_permission_in_session(
    permission.PERMISSION_LIST_METADATAS
)
@utils.wrap_to_dict(RESP_METADATA_FIELDS)
def get_package_os_metadata(
    adapter_id, os_id,
    user=None, session=None, **kwargs
):
    from compass.db.api import adapter_holder as adapter_api
    adapter = adapter_api.get_adapter_internal(session, adapter_id)
    os_ids = [os['os_id'] for os in adapter['supported_oses']]
    if os_id not in os_ids:
        raise exception.InvalidParameter(
            'os %s is not in the supported os list of adapter %s' % (
                os_id, adapter_id
            )
        )
    metadatas = {}
    metadatas['os_config'] = get_os_metadata_internal(
        session, os_id
    )
    metadatas['package_config'] = get_package_metadata_internal(
        session, adapter_id
    )
    return metadatas


def _autofill_config(
    config, id, id_name, metadata_mapping, **kwargs
):
    if id not in metadata_mapping:
        raise exception.InvalidParameter(
            '%s id %s is not found in metadata mapping' % (id_name, id)
        )
    metadatas = metadata_mapping[id]
    logging.debug(
        'auto fill %s config %s by params %s',
        id_name, config, kwargs
    )
    return metadata_api.autofill_config_internal(
        config, metadatas, **kwargs
    )


def autofill_os_config(
    session, config, os_id, **kwargs
):
    if not OS_METADATA_MAPPING:
        load_os_metadatas_internal(session)
    return _autofill_config(
        config, os_id, 'os', OS_METADATA_MAPPING, session=session, **kwargs
    )


def autofill_package_config(
    session, config, adapter_id, **kwargs
):
    if not PACKAGE_METADATA_MAPPING:
        load_package_metadatas_internal(session)
    return _autofill_config(
        config, adapter_id, 'adapter', PACKAGE_METADATA_MAPPING,
        session=session, **kwargs
    )