# -*- coding: utf-8 -*-
# Copyright 2014-2016 OpenMarket Ltd
# Copyright 2018 New Vector 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.

import logging

import six

from canonicaljson import encode_canonical_json, json

from twisted.internet import defer

from synapse.util.caches.descriptors import cachedInlineCallbacks, cachedList

from ._base import SQLBaseStore

logger = logging.getLogger(__name__)

if six.PY2:
    db_binary_type = buffer
else:
    db_binary_type = memoryview


class PusherWorkerStore(SQLBaseStore):
    def _decode_pushers_rows(self, rows):
        for r in rows:
            dataJson = r['data']
            r['data'] = None
            try:
                if isinstance(dataJson, db_binary_type):
                    dataJson = str(dataJson).decode("UTF8")

                r['data'] = json.loads(dataJson)
            except Exception as e:
                logger.warn(
                    "Invalid JSON in data for pusher %d: %s, %s",
                    r['id'], dataJson, e.args[0],
                )
                pass

            if isinstance(r['pushkey'], db_binary_type):
                r['pushkey'] = str(r['pushkey']).decode("UTF8")

        return rows

    @defer.inlineCallbacks
    def user_has_pusher(self, user_id):
        ret = yield self._simple_select_one_onecol(
            "pushers", {"user_name": user_id}, "id", allow_none=True
        )
        defer.returnValue(ret is not None)

    def get_pushers_by_app_id_and_pushkey(self, app_id, pushkey):
        return self.get_pushers_by({
            "app_id": app_id,
            "pushkey": pushkey,
        })

    def get_pushers_by_user_id(self, user_id):
        return self.get_pushers_by({
            "user_name": user_id,
        })

    @defer.inlineCallbacks
    def get_pushers_by(self, keyvalues):
        ret = yield self._simple_select_list(
            "pushers", keyvalues,
            [
                "id",
                "user_name",
                "access_token",
                "profile_tag",
                "kind",
                "app_id",
                "app_display_name",
                "device_display_name",
                "pushkey",
                "ts",
                "lang",
                "data",
                "last_stream_ordering",
                "last_success",
                "failing_since",
            ], desc="get_pushers_by"
        )
        defer.returnValue(self._decode_pushers_rows(ret))

    @defer.inlineCallbacks
    def get_all_pushers(self):
        def get_pushers(txn):
            txn.execute("SELECT * FROM pushers")
            rows = self.cursor_to_dict(txn)

            return self._decode_pushers_rows(rows)

        rows = yield self.runInteraction("get_all_pushers", get_pushers)
        defer.returnValue(rows)

    def get_all_updated_pushers(self, last_id, current_id, limit):
        if last_id == current_id:
            return defer.succeed(([], []))

        def get_all_updated_pushers_txn(txn):
            sql = (
                "SELECT id, user_name, access_token, profile_tag, kind,"
                " app_id, app_display_name, device_display_name, pushkey, ts,"
                " lang, data"
                " FROM pushers"
                " WHERE ? < id AND id <= ?"
                " ORDER BY id ASC LIMIT ?"
            )
            txn.execute(sql, (last_id, current_id, limit))
            updated = txn.fetchall()

            sql = (
                "SELECT stream_id, user_id, app_id, pushkey"
                " FROM deleted_pushers"
                " WHERE ? < stream_id AND stream_id <= ?"
                " ORDER BY stream_id ASC LIMIT ?"
            )
            txn.execute(sql, (last_id, current_id, limit))
            deleted = txn.fetchall()

            return (updated, deleted)
        return self.runInteraction(
            "get_all_updated_pushers", get_all_updated_pushers_txn
        )

    def get_all_updated_pushers_rows(self, last_id, current_id, limit):
        """Get all the pushers that have changed between the given tokens.

        Returns:
            Deferred(list(tuple)): each tuple consists of:
                stream_id (str)
                user_id (str)
                app_id (str)
                pushkey (str)
                was_deleted (bool): whether the pusher was added/updated (False)
                    or deleted (True)
        """

        if last_id == current_id:
            return defer.succeed([])

        def get_all_updated_pushers_rows_txn(txn):
            sql = (
                "SELECT id, user_name, app_id, pushkey"
                " FROM pushers"
                " WHERE ? < id AND id <= ?"
                " ORDER BY id ASC LIMIT ?"
            )
            txn.execute(sql, (last_id, current_id, limit))
            results = [list(row) + [False] for row in txn]

            sql = (
                "SELECT stream_id, user_id, app_id, pushkey"
                " FROM deleted_pushers"
                " WHERE ? < stream_id AND stream_id <= ?"
                " ORDER BY stream_id ASC LIMIT ?"
            )
            txn.execute(sql, (last_id, current_id, limit))

            results.extend(list(row) + [True] for row in txn)
            results.sort()  # Sort so that they're ordered by stream id

            return results
        return self.runInteraction(
            "get_all_updated_pushers_rows", get_all_updated_pushers_rows_txn
        )

    @cachedInlineCallbacks(num_args=1, max_entries=15000)
    def get_if_user_has_pusher(self, user_id):
        # This only exists for the cachedList decorator
        raise NotImplementedError()

    @cachedList(cached_method_name="get_if_user_has_pusher",
                list_name="user_ids", num_args=1, inlineCallbacks=True)
    def get_if_users_have_pushers(self, user_ids):
        rows = yield self._simple_select_many_batch(
            table='pushers',
            column='user_name',
            iterable=user_ids,
            retcols=['user_name'],
            desc='get_if_users_have_pushers'
        )

        result = {user_id: False for user_id in user_ids}
        result.update({r['user_name']: True for r in rows})

        defer.returnValue(result)


class PusherStore(PusherWorkerStore):
    def get_pushers_stream_token(self):
        return self._pushers_id_gen.get_current_token()

    @defer.inlineCallbacks
    def add_pusher(self, user_id, access_token, kind, app_id,
                   app_display_name, device_display_name,
                   pushkey, pushkey_ts, lang, data, last_stream_ordering,
                   profile_tag=""):
        with self._pushers_id_gen.get_next() as stream_id:
            # no need to lock because `pushers` has a unique key on
            # (app_id, pushkey, user_name) so _simple_upsert will retry
            newly_inserted = yield self._simple_upsert(
                table="pushers",
                keyvalues={
                    "app_id": app_id,
                    "pushkey": pushkey,
                    "user_name": user_id,
                },
                values={
                    "access_token": access_token,
                    "kind": kind,
                    "app_display_name": app_display_name,
                    "device_display_name": device_display_name,
                    "ts": pushkey_ts,
                    "lang": lang,
                    "data": encode_canonical_json(data),
                    "last_stream_ordering": last_stream_ordering,
                    "profile_tag": profile_tag,
                    "id": stream_id,
                },
                desc="add_pusher",
                lock=False,
            )

            if newly_inserted:
                yield self.runInteraction(
                    "add_pusher",
                    self._invalidate_cache_and_stream,
                    self.get_if_user_has_pusher, (user_id,)
                )

    @defer.inlineCallbacks
    def delete_pusher_by_app_id_pushkey_user_id(self, app_id, pushkey, user_id):
        def delete_pusher_txn(txn, stream_id):
            self._invalidate_cache_and_stream(
                txn, self.get_if_user_has_pusher, (user_id,)
            )

            self._simple_delete_one_txn(
                txn,
                "pushers",
                {"app_id": app_id, "pushkey": pushkey, "user_name": user_id}
            )

            # it's possible for us to end up with duplicate rows for
            # (app_id, pushkey, user_id) at different stream_ids, but that
            # doesn't really matter.
            self._simple_insert_txn(
                txn,
                table="deleted_pushers",
                values={
                    "stream_id": stream_id,
                    "app_id": app_id,
                    "pushkey": pushkey,
                    "user_id": user_id,
                },
            )

        with self._pushers_id_gen.get_next() as stream_id:
            yield self.runInteraction(
                "delete_pusher", delete_pusher_txn, stream_id
            )

    @defer.inlineCallbacks
    def update_pusher_last_stream_ordering(self, app_id, pushkey, user_id,
                                           last_stream_ordering):
        yield self._simple_update_one(
            "pushers",
            {'app_id': app_id, 'pushkey': pushkey, 'user_name': user_id},
            {'last_stream_ordering': last_stream_ordering},
            desc="update_pusher_last_stream_ordering",
        )

    @defer.inlineCallbacks
    def update_pusher_last_stream_ordering_and_success(self, app_id, pushkey,
                                                       user_id,
                                                       last_stream_ordering,
                                                       last_success):
        yield self._simple_update_one(
            "pushers",
            {'app_id': app_id, 'pushkey': pushkey, 'user_name': user_id},
            {
                'last_stream_ordering': last_stream_ordering,
                'last_success': last_success
            },
            desc="update_pusher_last_stream_ordering_and_success",
        )

    @defer.inlineCallbacks
    def update_pusher_failing_since(self, app_id, pushkey, user_id,
                                    failing_since):
        yield self._simple_update_one(
            "pushers",
            {'app_id': app_id, 'pushkey': pushkey, 'user_name': user_id},
            {'failing_since': failing_since},
            desc="update_pusher_failing_since",
        )

    @defer.inlineCallbacks
    def get_throttle_params_by_room(self, pusher_id):
        res = yield self._simple_select_list(
            "pusher_throttle",
            {"pusher": pusher_id},
            ["room_id", "last_sent_ts", "throttle_ms"],
            desc="get_throttle_params_by_room"
        )

        params_by_room = {}
        for row in res:
            params_by_room[row["room_id"]] = {
                "last_sent_ts": row["last_sent_ts"],
                "throttle_ms": row["throttle_ms"]
            }

        defer.returnValue(params_by_room)

    @defer.inlineCallbacks
    def set_throttle_params(self, pusher_id, room_id, params):
        # no need to lock because `pusher_throttle` has a primary key on
        # (pusher, room_id) so _simple_upsert will retry
        yield self._simple_upsert(
            "pusher_throttle",
            {"pusher": pusher_id, "room_id": room_id},
            params,
            desc="set_throttle_params",
            lock=False,
        )
