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# -*- coding: utf-8 -*-
# Copyright 2014-2016 OpenMarket 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 synapse.api.errors import StoreError
from synapse.storage.roommember import ProfileInfo

from ._base import SQLBaseStore


class ProfileWorkerStore(SQLBaseStore):
    @defer.inlineCallbacks
    def get_profileinfo(self, user_localpart):
        try:
            profile = yield self._simple_select_one(
                table="profiles",
                keyvalues={"user_id": user_localpart},
                retcols=("displayname", "avatar_url"),
                desc="get_profileinfo",
            )
        except StoreError as e:
            if e.code == 404:
                # no match
                defer.returnValue(ProfileInfo(None, None))
                return
            else:
                raise

        defer.returnValue(
            ProfileInfo(
                avatar_url=profile['avatar_url'],
                display_name=profile['displayname'],
            )
        )

    def get_profile_displayname(self, user_localpart):
        return self._simple_select_one_onecol(
            table="profiles",
            keyvalues={"user_id": user_localpart},
            retcol="displayname",
            desc="get_profile_displayname",
        )

    def get_profile_avatar_url(self, user_localpart):
        return self._simple_select_one_onecol(
            table="profiles",
            keyvalues={"user_id": user_localpart},
            retcol="avatar_url",
            desc="get_profile_avatar_url",
        )

    def get_from_remote_profile_cache(self, user_id):
        return self._simple_select_one(
            table="remote_profile_cache",
            keyvalues={"user_id": user_id},
            retcols=("displayname", "avatar_url",),
            allow_none=True,
            desc="get_from_remote_profile_cache",
        )

    def create_profile(self, user_localpart):
        return self._simple_insert(
            table="profiles",
            values={"user_id": user_localpart},
            desc="create_profile",
        )

    def set_profile_displayname(self, user_localpart, new_displayname):
        return self._simple_update_one(
            table="profiles",
            keyvalues={"user_id": user_localpart},
            updatevalues={"displayname": new_displayname},
            desc="set_profile_displayname",
        )

    def set_profile_avatar_url(self, user_localpart, new_avatar_url):
        return self._simple_update_one(
            table="profiles",
            keyvalues={"user_id": user_localpart},
            updatevalues={"avatar_url": new_avatar_url},
            desc="set_profile_avatar_url",
        )


class ProfileStore(ProfileWorkerStore):
    def add_remote_profile_cache(self, user_id, displayname, avatar_url):
        """Ensure we are caching the remote user's profiles.

        This should only be called when `is_subscribed_remote_profile_for_user`
        would return true for the user.
        """
        return self._simple_upsert(
            table="remote_profile_cache",
            keyvalues={"user_id": user_id},
            values={
                "displayname": displayname,
                "avatar_url": avatar_url,
                "last_check": self._clock.time_msec(),
            },
            desc="add_remote_profile_cache",
        )

    def update_remote_profile_cache(self, user_id, displayname, avatar_url):
        return self._simple_update(
            table="remote_profile_cache",
            keyvalues={"user_id": user_id},
            values={
                "displayname": displayname,
                "avatar_url": avatar_url,
                "last_check": self._clock.time_msec(),
            },
            desc="update_remote_profile_cache",
        )

    @defer.inlineCallbacks
    def maybe_delete_remote_profile_cache(self, user_id):
        """Check if we still care about the remote user's profile, and if we
        don't then remove their profile from the cache
        """
        subscribed = yield self.is_subscribed_remote_profile_for_user(user_id)
        if not subscribed:
            yield self._simple_delete(
                table="remote_profile_cache",
                keyvalues={"user_id": user_id},
                desc="delete_remote_profile_cache",
            )

    def get_remote_profile_cache_entries_that_expire(self, last_checked):
        """Get all users who haven't been checked since `last_checked`
        """
        def _get_remote_profile_cache_entries_that_expire_txn(txn):
            sql = """
                SELECT user_id, displayname, avatar_url
                FROM remote_profile_cache
                WHERE last_check < ?
            """

            txn.execute(sql, (last_checked,))

            return self.cursor_to_dict(txn)

        return self.runInteraction(
            "get_remote_profile_cache_entries_that_expire",
            _get_remote_profile_cache_entries_that_expire_txn,
        )

    @defer.inlineCallbacks
    def is_subscribed_remote_profile_for_user(self, user_id):
        """Check whether we are interested in a remote user's profile.
        """
        res = yield self._simple_select_one_onecol(
            table="group_users",
            keyvalues={"user_id": user_id},
            retcol="user_id",
            allow_none=True,
            desc="should_update_remote_profile_cache_for_user",
        )

        if res:
            defer.returnValue(True)

        res = yield self._simple_select_one_onecol(
            table="group_invites",
            keyvalues={"user_id": user_id},
            retcol="user_id",
            allow_none=True,
            desc="should_update_remote_profile_cache_for_user",
        )

        if res:
            defer.returnValue(True)