# -*- coding: utf-8 -*-
# Copyright 2017 Vector Creations 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.

from twisted.internet import defer

from ._base import SQLBaseStore

import ujson as json


class GroupServerStore(SQLBaseStore):
    def get_group(self, group_id):
        return self._simple_select_one(
            table="groups",
            keyvalues={
                "group_id": group_id,
            },
            retcols=("name", "short_description", "long_description", "avatar_url",),
            allow_none=True,
            desc="is_user_in_group",
        )

    def get_users_in_group(self, group_id, include_private=False):
        # TODO: Pagination

        keyvalues = {
            "group_id": group_id,
        }
        if not include_private:
            keyvalues["is_public"] = True

        return self._simple_select_list(
            table="group_users",
            keyvalues=keyvalues,
            retcols=("user_id", "is_public",),
            desc="get_users_in_group",
        )

    def get_rooms_in_group(self, group_id, include_private=False):
        # TODO: Pagination

        keyvalues = {
            "group_id": group_id,
        }
        if not include_private:
            keyvalues["is_public"] = True

        return self._simple_select_list(
            table="group_rooms",
            keyvalues=keyvalues,
            retcols=("room_id", "is_public",),
            desc="get_rooms_in_group",
        )

    def is_user_in_group(self, user_id, group_id):
        return self._simple_select_one_onecol(
            table="group_users",
            keyvalues={
                "group_id": group_id,
                "user_id": user_id,
            },
            retcol="user_id",
            allow_none=True,
            desc="is_user_in_group",
        ).addCallback(lambda r: bool(r))

    def is_user_admin_in_group(self, group_id, user_id):
        return self._simple_select_one_onecol(
            table="group_users",
            keyvalues={
                "group_id": group_id,
                "user_id": user_id,
            },
            retcol="is_admin",
            allow_none=True,
            desc="is_user_adim_in_group",
        )

    def add_group_invite(self, group_id, user_id):
        """Record that the group server has invited a user
        """
        return self._simple_insert(
            table="group_invites",
            values={
                "group_id": group_id,
                "user_id": user_id,
            },
            desc="add_group_invite",
        )

    def is_user_invited_to_local_group(self, group_id, user_id):
        """Has the group server invited a user?
        """
        return self._simple_select_one_onecol(
            table="group_invites",
            keyvalues={
                "group_id": group_id,
                "user_id": user_id,
            },
            retcol="user_id",
            desc="is_user_invited_to_local_group",
            allow_none=True,
        )

    def add_user_to_group(self, group_id, user_id, is_admin=False, is_public=True,
                          local_attestation=None, remote_attestation=None):
        """Add a user to the group server.

        Args:
            group_id (str)
            user_id (str)
            is_admin (bool)
            is_public (bool)
            local_attestation (dict): The attestation the GS created to give
                to the remote server. Optional if the user and group are on the
                same server
            remote_attestation (dict): The attestation given to GS by remote
                server. Optional if the user and group are on the same server
        """
        def _add_user_to_group_txn(txn):
            self._simple_insert_txn(
                txn,
                table="group_users",
                values={
                    "group_id": group_id,
                    "user_id": user_id,
                    "is_admin": is_admin,
                    "is_public": is_public,
                },
            )

            self._simple_delete_txn(
                txn,
                table="group_invites",
                keyvalues={
                    "group_id": group_id,
                    "user_id": user_id,
                },
            )

            if local_attestation:
                self._simple_insert_txn(
                    txn,
                    table="group_attestations_renewals",
                    values={
                        "group_id": group_id,
                        "user_id": user_id,
                        "valid_until_ms": local_attestation["valid_until_ms"],
                    },
                )
            if remote_attestation:
                self._simple_insert_txn(
                    txn,
                    table="group_attestations_remote",
                    values={
                        "group_id": group_id,
                        "user_id": user_id,
                        "valid_until_ms": remote_attestation["valid_until_ms"],
                        "attestation": json.dumps(remote_attestation),
                    },
                )

        return self.runInteraction(
            "add_user_to_group", _add_user_to_group_txn
        )

    def remove_user_from_group(self, group_id, user_id):
        def _remove_user_from_group_txn(txn):
            self._simple_delete_txn(
                txn,
                table="group_users",
                keyvalues={
                    "group_id": group_id,
                    "user_id": user_id,
                },
            )
            self._simple_delete_txn(
                txn,
                table="group_invites",
                keyvalues={
                    "group_id": group_id,
                    "user_id": user_id,
                },
            )
            self._simple_delete_txn(
                txn,
                table="group_attestations_renewals",
                keyvalues={
                    "group_id": group_id,
                    "user_id": user_id,
                },
            )
            self._simple_delete_txn(
                txn,
                table="group_attestations_remote",
                keyvalues={
                    "group_id": group_id,
                    "user_id": user_id,
                },
            )
        return self.runInteraction("remove_user_from_group", _remove_user_from_group_txn)

    def add_room_to_group(self, group_id, room_id, is_public):
        return self._simple_insert(
            table="group_rooms",
            values={
                "group_id": group_id,
                "room_id": room_id,
                "is_public": is_public,
            },
            desc="add_room_to_group",
        )

    @defer.inlineCallbacks
    def create_group(self, group_id, user_id, name, avatar_url, short_description,
                     long_description,):
        yield self._simple_insert(
            table="groups",
            values={
                "group_id": group_id,
                "name": name,
                "avatar_url": avatar_url,
                "short_description": short_description,
                "long_description": long_description,
            },
            desc="create_group",
        )

    def get_attestations_need_renewals(self, valid_until_ms):
        """Get all attestations that need to be renewed until givent time
        """
        def _get_attestations_need_renewals_txn(txn):
            sql = """
                SELECT group_id, user_id FROM group_attestations_renewals
                WHERE valid_until_ms <= ?
            """
            txn.execute(sql, (valid_until_ms,))
            return self.cursor_to_dict(txn)
        return self.runInteraction(
            "get_attestations_need_renewals", _get_attestations_need_renewals_txn
        )

    def update_attestation_renewal(self, group_id, user_id, attestation):
        """Update an attestation that we have renewed
        """
        return self._simple_update_one(
            table="group_attestations_renewals",
            keyvalues={
                "group_id": group_id,
                "user_id": user_id,
            },
            updatevalues={
                "valid_until_ms": attestation["valid_until_ms"],
            },
            desc="update_attestation_renewal",
        )

    def update_remote_attestion(self, group_id, user_id, attestation):
        """Update an attestation that a remote has renewed
        """
        return self._simple_update_one(
            table="group_attestations_remote",
            keyvalues={
                "group_id": group_id,
                "user_id": user_id,
            },
            updatevalues={
                "valid_until_ms": attestation["valid_until_ms"],
                "attestation": json.dumps(attestation)
            },
            desc="update_remote_attestion",
        )

    @defer.inlineCallbacks
    def get_remote_attestation(self, group_id, user_id):
        """Get the attestation that proves the remote agrees that the user is
        in the group.
        """
        row = yield self._simple_select_one(
            table="group_attestations_remote",
            keyvalues={
                "group_id": group_id,
                "user_id": user_id,
            },
            retcols=("valid_until_ms", "attestation"),
            desc="get_remote_attestation",
            allow_none=True,
        )

        now = int(self._clock.time_msec())
        if row and now < row["valid_until_ms"]:
            defer.returnValue(json.loads(row["attestation"]))

        defer.returnValue(None)