# Copyright 2011-2013 GRNET S.A. All rights reserved.
#
# Redistribution and use in source and binary forms, with or
# without modification, are permitted provided that the following
# conditions are met:
#
#   1. Redistributions of source code must retain the above
#      copyright notice, this list of conditions and the following
#      disclaimer.
#
#   2. Redistributions in binary form must reproduce the above
#      copyright notice, this list of conditions and the following
#      disclaimer in the documentation and/or other materials
#      provided with the distribution.
#
# THIS SOFTWARE IS PROVIDED BY GRNET S.A. ``AS IS'' AND ANY EXPRESS
# OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
# WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
# PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL GRNET S.A OR
# CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
# USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
# AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
# ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
# POSSIBILITY OF SUCH DAMAGE.
#
# The views and conclusions contained in the software and
# documentation are those of the authors and should not be
# interpreted as representing official policies, either expressed
# or implied, of GRNET S.A.command

from kamaki.cli import command
from kamaki.clients.astakos import AstakosClient
from kamaki.cli.commands import (
    _command_init, errors, _optional_json, addLogSettings)
from kamaki.cli.command_tree import CommandTree
from kamaki.cli.errors import CLIBaseUrlError, CLIError
from kamaki.cli.utils import print_dict, ask_user

user_cmds = CommandTree('user', 'Astakos API commands')
_commands = [user_cmds]


class _user_init(_command_init):

    def _write_main_token(self, token):
        tokens = self.config.get_cloud(self.cloud, 'token').split()
        if token in tokens:
            tokens.remove(token)
        tokens.insert(0, token)
        self.config.set_cloud(self.cloud, 'token', ' '.join(tokens))
        self.config.write()

    @errors.generic.all
    @errors.user.load
    @addLogSettings
    def _run(self):
        if getattr(self, 'cloud', False):
            base_url = self._custom_url('astakos')
            if base_url:
                token = self._custom_token(
                    'astakos') or self.config.get_cloud(self.cloud, 'token')
                token = token.split()[0] if ' ' in token else token
                self.client = AstakosClient(base_url=base_url, token=token)
                return
        else:
            self.cloud = 'default'
        if getattr(self, 'auth_base', False):
            self.client = self.auth_base
            return
        raise CLIBaseUrlError(service='astakos')

    def main(self):
        self._run()


@command(user_cmds)
class user_authenticate(_user_init, _optional_json):
    """Authenticate a user
    Get user information (e.g. unique account name) from token
    Token should be set in settings:
    *  check if a token is set    /config whoami cloud.default.token
    *  permanently set a token    /config set cloud.default.token <token>
    Token can also be provided as a parameter
    (In case of another named cloud, use its name instead of default)
    """

    @staticmethod
    def _print_access(r):
        print_dict(r['access'])

    @errors.generic.all
    @errors.user.authenticate
    def _run(self, custom_token=None):
        token_bu = self.client.token
        try:
            r = self.client.authenticate(custom_token)
            if (token_bu != self.client.token and
                    ask_user('Permanently save token as cloud.%s.token ?' % (
                        self.cloud))):
                self._write_main_token(self.client.token)
        except Exception:
            #recover old token
            self.client.token = token_bu
            raise
        self._print(r, self._print_access)

    def main(self, custom_token=None):
        super(self.__class__, self)._run()
        self._run(custom_token)


@command(user_cmds)
class user_list(_user_init, _optional_json):
    """List all authenticated users"""

    @errors.generic.all
    def _run(self, custom_token=None):
        self._print(self.client.list_users())

    def main(self):
        super(self.__class__, self)._run()
        self._run()


@command(user_cmds)
class user_whoami(_user_init, _optional_json):
    """Get current session user information"""

    @errors.generic.all
    def _run(self):
        self._print(self.client.user_info(), print_dict)

    def main(self):
        super(self.__class__, self)._run()
        self._run()


@command(user_cmds)
class user_set(_user_init, _optional_json):
    """Set session user by id
    To enrich your options, authenticate more users:
    /user authenticate <other user token>
    To list authenticated users
    /user list
    To get the current session user
    /user whoami
    """

    @errors.generic.all
    def _run(self, uuid):
        for user in self.client.list_users():
            if user.get('id', None) in (uuid,):
                ntoken = user['auth_token']
                if ntoken == self.client.token:
                    print('%s (%s) is already the session user' % (
                        self.client.user_term('name'),
                        self.client.user_term('id')))
                    return
                self.client.token = user['auth_token']
                print('Session user set to %s (%s)' % (
                        self.client.user_term('name'),
                        self.client.user_term('id')))
                if ask_user('Permanently make %s the main user?' % (
                        self.client.user_term('name'))):
                    self._write_main_token(self.client.token)
                return
        raise CLIError(
            'User with UUID %s not authenticated in current session' % uuid,
            details=[
                'To authenticate a user', '  /user authenticate <t0k3n>'])

    def main(self, uuid):
        super(self.__class__, self)._run()
        self._run(uuid)