# Copyright 2017 Catalyst IT Limited
#
#    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.
import os
import tempfile
import zipfile

from osc_lib.command import command
from osc_lib import utils
from oslo_serialization import jsonutils

from qinlingclient.common import exceptions
from qinlingclient.osc.v1 import base


class List(base.QinlingLister):
    columns = base.FUNCTION_COLUMNS

    def _get_resources(self, parsed_args):
        client = self.app.client_manager.function_engine

        return client.functions.list(**base.get_filters(parsed_args))


class Create(command.ShowOne):
    columns = base.FUNCTION_COLUMNS

    def get_parser(self, prog_name):
        parser = super(Create, self).get_parser(prog_name)

        parser.add_argument(
            "name",
            metavar='NAME',
            help="New function name.",
        )
        parser.add_argument(
            "runtime",
            metavar='RUNTIME',
            help="Runtime ID.",
        )
        parser.add_argument(
            "code",
            metavar='CODE',
            help="Code definition.",
        )
        parser.add_argument(
            "--entry",
            metavar="FUNCTION_ENTRY",
            help="Function entry."
        )
        protected_group = parser.add_mutually_exclusive_group(required=True)
        # TODO(kong): Take a look at the file type in argparse module.
        protected_group.add_argument(
            "--file",
            metavar="CODE_FILE_PATH",
            help="Code file path."
        )
        protected_group.add_argument(
            "--package",
            metavar="CODE_PACKAGE_PATH",
            help="Code package zip file path."
        )

        return parser

    def take_action(self, parsed_args):
        zip_file = None

        if parsed_args.file:
            if not os.path.isfile(parsed_args.file):
                raise exceptions.QinlingClientException(
                    'File %s not exist.' % parsed_args.file
                )

            base_name, extention = os.path.splitext(parsed_args.file)
            base_name = os.path.basename(base_name)
            zip_file = os.path.join(
                tempfile.gettempdir(),
                '%s.zip' % base_name
            )

            zf = zipfile.ZipFile(zip_file, mode='w')
            try:
                # Use default compression mode, may change in future.
                zf.write(
                    parsed_args.file,
                    '%s%s' % (base_name, extention),
                    compress_type=zipfile.ZIP_STORED
                )
            finally:
                zf.close()
        if parsed_args.package:
            if not zipfile.is_zipfile(parsed_args.package):
                raise exceptions.QinlingClientException(
                    'Package %s is not a valid ZIP file.' % parsed_args.package
                )
            zip_file = parsed_args.package

        with open(zip_file, 'rb') as package:
            client = self.app.client_manager.function_engine
            function = client.functions.create(
                name=parsed_args.name,
                runtime=parsed_args.runtime,
                code=jsonutils.loads(parsed_args.code),
                package=package,
                entry=parsed_args.entry,
            )

        os.remove(zip_file)

        return self.columns, utils.get_item_properties(function, self.columns)


class Delete(base.QinlingDeleter):
    def get_parser(self, prog_name):
        parser = super(Delete, self).get_parser(prog_name)

        parser.add_argument(
            'function',
            nargs='+',
            metavar='FUNCTION',
            help='Id of function(s).'
        )

        return parser

    def take_action(self, parsed_args):
        client = self.app.client_manager.function_engine
        self.delete = client.functions.delete
        self.resource = 'function'

        self.delete_resources(parsed_args.function)