# vim: tabstop=4 shiftwidth=4 softtabstop=4

#    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 sys
import functools

from heat.common import context
from heat.common import exception
from heat.engine import environment
from heat.engine import parser

from heat.db.sqlalchemy.session import get_engine
from heat.db import migration


def stack_delete_after(test_fn):
    """
    Decorator which calls test class self.stack.delete()
    to ensure tests clean up their stacks regardless of test success/failure
    """
    @functools.wraps(test_fn)
    def wrapped_test(test_case, *args, **kwargs):
        def delete_stack():
            stack = getattr(test_case, 'stack', None)
            if stack is not None and stack.id is not None:
                stack.delete()

        try:
            test_fn(test_case, *args, **kwargs)
        except:
            exc_class, exc_val, exc_tb = sys.exc_info()
            try:
                delete_stack()
            finally:
                raise exc_class, exc_val, exc_tb
        else:
            delete_stack()

    return wrapped_test


def wr_delete_after(test_fn):
    """
    Decorator which calls test class self.wr.destroy()
    to ensure tests clean up their watchrule regardless of test success/failure
    Used by tests which create watchrule objects directly to cleanup correctly
    self.wr can be either a single watchrule, or a list of several watchrules
    """
    @functools.wraps(test_fn)
    def wrapped_test(test_case, *args, **kwargs):

        def delete_wrs():
            wr = getattr(test_case, 'wr', None)
            try:
                for w in wr:
                    delete_wr(w)
            except TypeError:
                delete_wr(wr)

        def delete_wr(w):
            if w.id is not None:
                try:
                    w.destroy()
                except exception.NotFound:
                    pass
        try:
            test_fn(test_case, *args, **kwargs)
        except:
            exc_class, exc_val, exc_tb = sys.exc_info()
            try:
                delete_wrs()
            finally:
                raise exc_class, exc_val, exc_tb
        else:
            delete_wrs()

    return wrapped_test


def setup_dummy_db():
    migration.db_sync()
    engine = get_engine()
    conn = engine.connect()


def parse_stack(t, params={}, stack_name='test_stack', stack_id=None):
    ctx = context.RequestContext.from_dict({'tenant_id': 'test_tenant',
                                            'tenant': 'test_tenant',
                                            'username': 'test_username',
                                            'password': 'password',
                                            'auth_url':
                                            'http://localhost:5000/v2.0'})
    template = parser.Template(t)
    stack = parser.Stack(ctx, stack_name, template,
                         environment.Environment(params), stack_id)
    stack.store()

    return stack


class PhysName(object):
    def __init__(self, stack_name, resource_name):
        self.stack_name = stack_name
        self.resource_name = resource_name

    def __eq__(self, physical_name):
        try:
            stack, res, short_id = str(physical_name).rsplit('-', 2)
        except ValueError:
            return False

        if self.stack_name != stack or self.resource_name != res:
            return False

        if len(short_id) != 12:
            return False

        return True

    def __ne__(self, physical_name):
        return not self.__eq__(physical_name)

    def __repr__(self):
        return '%s-%s-%s' % (self.stack_name,
                             self.resource_name,
                             'x' * 12)