#!/usr/bin/env python
# -*- coding: utf-8 -*-
# Copyright 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.
import logging
import sys

from twisted.internet import reactor
from twisted.web.resource import NoResource

import synapse
from synapse import events
from synapse.api.urls import CONTENT_REPO_PREFIX, LEGACY_MEDIA_PREFIX, MEDIA_PREFIX
from synapse.app import _base
from synapse.config._base import ConfigError
from synapse.config.homeserver import HomeServerConfig
from synapse.config.logger import setup_logging
from synapse.crypto import context_factory
from synapse.http.site import SynapseSite
from synapse.metrics import RegistryProxy
from synapse.metrics.resource import METRICS_PREFIX, MetricsResource
from synapse.replication.slave.storage._base import BaseSlavedStore
from synapse.replication.slave.storage.appservice import SlavedApplicationServiceStore
from synapse.replication.slave.storage.client_ips import SlavedClientIpStore
from synapse.replication.slave.storage.registration import SlavedRegistrationStore
from synapse.replication.slave.storage.transactions import TransactionStore
from synapse.replication.tcp.client import ReplicationClientHandler
from synapse.rest.media.v0.content_repository import ContentRepoResource
from synapse.server import HomeServer
from synapse.storage.engines import create_engine
from synapse.storage.media_repository import MediaRepositoryStore
from synapse.util.httpresourcetree import create_resource_tree
from synapse.util.logcontext import LoggingContext
from synapse.util.manhole import manhole
from synapse.util.versionstring import get_version_string

logger = logging.getLogger("synapse.app.media_repository")


class MediaRepositorySlavedStore(
    SlavedApplicationServiceStore,
    SlavedRegistrationStore,
    SlavedClientIpStore,
    TransactionStore,
    BaseSlavedStore,
    MediaRepositoryStore,
):
    pass


class MediaRepositoryServer(HomeServer):
    def setup(self):
        logger.info("Setting up.")
        self.datastore = MediaRepositorySlavedStore(self.get_db_conn(), self)
        logger.info("Finished setting up.")

    def _listen_http(self, listener_config):
        port = listener_config["port"]
        bind_addresses = listener_config["bind_addresses"]
        site_tag = listener_config.get("tag", port)
        resources = {}
        for res in listener_config["resources"]:
            for name in res["names"]:
                if name == "metrics":
                    resources[METRICS_PREFIX] = MetricsResource(RegistryProxy)
                elif name == "media":
                    media_repo = self.get_media_repository_resource()
                    resources.update({
                        MEDIA_PREFIX: media_repo,
                        LEGACY_MEDIA_PREFIX: media_repo,
                        CONTENT_REPO_PREFIX: ContentRepoResource(
                            self, self.config.uploads_path
                        ),
                    })

        root_resource = create_resource_tree(resources, NoResource())

        _base.listen_tcp(
            bind_addresses,
            port,
            SynapseSite(
                "synapse.access.http.%s" % (site_tag,),
                site_tag,
                listener_config,
                root_resource,
                self.version_string,
            )
        )

        logger.info("Synapse media repository now listening on port %d", port)

    def start_listening(self, listeners):
        for listener in listeners:
            if listener["type"] == "http":
                self._listen_http(listener)
            elif listener["type"] == "manhole":
                _base.listen_tcp(
                    listener["bind_addresses"],
                    listener["port"],
                    manhole(
                        username="matrix",
                        password="rabbithole",
                        globals={"hs": self},
                    )
                )
            elif listener["type"] == "metrics":
                if not self.get_config().enable_metrics:
                    logger.warn(("Metrics listener configured, but "
                                 "enable_metrics is not True!"))
                else:
                    _base.listen_metrics(listener["bind_addresses"],
                                         listener["port"])
            else:
                logger.warn("Unrecognized listener type: %s", listener["type"])

        self.get_tcp_replication().start_replication(self)

    def build_tcp_replication(self):
        return ReplicationClientHandler(self.get_datastore())


def start(config_options):
    try:
        config = HomeServerConfig.load_config(
            "Synapse media repository", config_options
        )
    except ConfigError as e:
        sys.stderr.write("\n" + e.message + "\n")
        sys.exit(1)

    assert config.worker_app == "synapse.app.media_repository"

    if config.enable_media_repo:
        _base.quit_with_error(
            "enable_media_repo must be disabled in the main synapse process\n"
            "before the media repo can be run in a separate worker.\n"
            "Please add ``enable_media_repo: false`` to the main config\n"
        )

    setup_logging(config, use_worker_options=True)

    events.USE_FROZEN_DICTS = config.use_frozen_dicts

    database_engine = create_engine(config.database_config)

    tls_server_context_factory = context_factory.ServerContextFactory(config)
    tls_client_options_factory = context_factory.ClientTLSOptionsFactory(config)

    ss = MediaRepositoryServer(
        config.server_name,
        db_config=config.database_config,
        tls_server_context_factory=tls_server_context_factory,
        tls_client_options_factory=tls_client_options_factory,
        config=config,
        version_string="Synapse/" + get_version_string(synapse),
        database_engine=database_engine,
    )

    ss.setup()
    ss.start_listening(config.worker_listeners)

    def start():
        ss.get_state_handler().start_caching()
        ss.get_datastore().start_profiling()

    reactor.callWhenRunning(start)

    _base.start_worker_reactor("synapse-media-repository", config)


if __name__ == '__main__':
    with LoggingContext("main"):
        start(sys.argv[1:])