# 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 typing import TYPE_CHECKING, Optional

from synapse.api.errors import StoreError
from synapse.storage._base import SQLBaseStore
from synapse.storage.database import (
    DatabasePool,
    LoggingDatabaseConnection,
    LoggingTransaction,
)
from synapse.storage.databases.main.roommember import ProfileInfo
from synapse.storage.engines import PostgresEngine
from synapse.types import JsonDict, UserID

if TYPE_CHECKING:
    from synapse.server import HomeServer


class ProfileWorkerStore(SQLBaseStore):
    def __init__(
        self,
        database: DatabasePool,
        db_conn: LoggingDatabaseConnection,
        hs: "HomeServer",
    ):
        super().__init__(database, db_conn, hs)
        self.server_name: str = hs.hostname
        self.database_engine = database.engine
        self.db_pool.updates.register_background_index_update(
            "profiles_full_user_id_key_idx",
            index_name="profiles_full_user_id_key",
            table="profiles",
            columns=["full_user_id"],
            unique=True,
        )

        self.db_pool.updates.register_background_update_handler(
            "populate_full_user_id_profiles", self.populate_full_user_id_profiles
        )

    async def populate_full_user_id_profiles(
        self, progress: JsonDict, batch_size: int
    ) -> int:
        """
        Background update to populate the column `full_user_id` of the table
        profiles from entries in the column `user_local_part` of the same table
        """

        lower_bound_id = progress.get("lower_bound_id", "")

        def _get_last_id(txn: LoggingTransaction) -> Optional[str]:
            sql = """
                    SELECT user_id FROM profiles
                    WHERE user_id > ?
                    ORDER BY user_id
                    LIMIT 1 OFFSET 50
                  """
            txn.execute(sql, (lower_bound_id,))
            res = txn.fetchone()
            if res:
                upper_bound_id = res[0]
                return upper_bound_id
            else:
                return None

        def _process_batch(
            txn: LoggingTransaction, lower_bound_id: str, upper_bound_id: str
        ) -> None:
            sql = """
                    UPDATE profiles
                    SET full_user_id = '@' || user_id || ?
                    WHERE ? < user_id AND user_id <= ? AND full_user_id IS NULL
                   """
            txn.execute(sql, (f":{self.server_name}", lower_bound_id, upper_bound_id))

        def _final_batch(txn: LoggingTransaction, lower_bound_id: str) -> None:
            sql = """
                    UPDATE profiles
                    SET full_user_id = '@' || user_id || ?
                    WHERE ? < user_id AND full_user_id IS NULL
                   """
            txn.execute(
                sql,
                (
                    f":{self.server_name}",
                    lower_bound_id,
                ),
            )

            if isinstance(self.database_engine, PostgresEngine):
                sql = """
                        ALTER TABLE profiles VALIDATE CONSTRAINT full_user_id_not_null
                      """
                txn.execute(sql)

        upper_bound_id = await self.db_pool.runInteraction(
            "populate_full_user_id_profiles", _get_last_id
        )

        if upper_bound_id is None:
            await self.db_pool.runInteraction(
                "populate_full_user_id_profiles", _final_batch, lower_bound_id
            )

            await self.db_pool.updates._end_background_update(
                "populate_full_user_id_profiles"
            )
            return 1

        await self.db_pool.runInteraction(
            "populate_full_user_id_profiles",
            _process_batch,
            lower_bound_id,
            upper_bound_id,
        )

        progress["lower_bound_id"] = upper_bound_id

        await self.db_pool.runInteraction(
            "populate_full_user_id_profiles",
            self.db_pool.updates._background_update_progress_txn,
            "populate_full_user_id_profiles",
            progress,
        )

        return 50

    async def get_profileinfo(self, user_localpart: str) -> ProfileInfo:
        try:
            profile = await self.db_pool.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
                return ProfileInfo(None, None)
            else:
                raise

        return ProfileInfo(
            avatar_url=profile["avatar_url"], display_name=profile["displayname"]
        )

    async def get_profile_displayname(self, user_localpart: str) -> Optional[str]:
        return await self.db_pool.simple_select_one_onecol(
            table="profiles",
            keyvalues={"user_id": user_localpart},
            retcol="displayname",
            desc="get_profile_displayname",
        )

    async def get_profile_avatar_url(self, user_localpart: str) -> Optional[str]:
        return await self.db_pool.simple_select_one_onecol(
            table="profiles",
            keyvalues={"user_id": user_localpart},
            retcol="avatar_url",
            desc="get_profile_avatar_url",
        )

    async def create_profile(self, user_id: UserID) -> None:
        user_localpart = user_id.localpart
        await self.db_pool.simple_insert(
            table="profiles",
            values={"user_id": user_localpart, "full_user_id": user_id.to_string()},
            desc="create_profile",
        )

    async def set_profile_displayname(
        self, user_id: UserID, new_displayname: Optional[str]
    ) -> None:
        """
        Set the display name of a user.

        Args:
            user_id: The user's ID.
            new_displayname: The new display name. If this is None, the user's display
                name is removed.
        """
        user_localpart = user_id.localpart
        await self.db_pool.simple_upsert(
            table="profiles",
            keyvalues={"user_id": user_localpart},
            values={
                "displayname": new_displayname,
                "full_user_id": user_id.to_string(),
            },
            desc="set_profile_displayname",
        )

    async def set_profile_avatar_url(
        self, user_id: UserID, new_avatar_url: Optional[str]
    ) -> None:
        """
        Set the avatar of a user.

        Args:
            user_id: The user's ID.
            new_avatar_url: The new avatar URL. If this is None, the user's avatar is
                removed.
        """
        user_localpart = user_id.localpart
        await self.db_pool.simple_upsert(
            table="profiles",
            keyvalues={"user_id": user_localpart},
            values={"avatar_url": new_avatar_url, "full_user_id": user_id.to_string()},
            desc="set_profile_avatar_url",
        )


class ProfileStore(ProfileWorkerStore):
    pass