/*    Copyright 2014 MongoDB Inc.
 *
 *    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.
 */

#include "mongo/platform/basic.h"

#include "mongo/dbtests/mock/mock_conn_registry.h"

#include "mongo/base/init.h"
#include "mongo/dbtests/mock/mock_dbclient_connection.h"

namespace mongo {

using std::string;

boost::scoped_ptr<MockConnRegistry> MockConnRegistry::_instance;

MONGO_INITIALIZER(MockConnRegistry)(InitializerContext* context) {
    return MockConnRegistry::init();
}

Status MockConnRegistry::init() {
    MockConnRegistry::_instance.reset(new MockConnRegistry());
    return Status::OK();
}

MockConnRegistry::MockConnRegistry() : _mockConnStrHook(this), _registryMutex() {}

MockConnRegistry* MockConnRegistry::get() {
    return _instance.get();
}

ConnectionString::ConnectionHook* MockConnRegistry::getConnStrHook() {
    return &_mockConnStrHook;
}

void MockConnRegistry::addServer(MockRemoteDBServer* server) {
    boost::lock_guard<boost::mutex> sl(_registryMutex);

    const std::string hostName(server->getServerAddress());
    fassert(16533, _registry.count(hostName) == 0);

    _registry[hostName] = server;
}

bool MockConnRegistry::removeServer(const std::string& hostName) {
    boost::lock_guard<boost::mutex> sl(_registryMutex);
    return _registry.erase(hostName) == 1;
}

void MockConnRegistry::clear() {
    boost::lock_guard<boost::mutex> sl(_registryMutex);
    _registry.clear();
}

MockDBClientConnection* MockConnRegistry::connect(const std::string& connStr) {
    boost::lock_guard<boost::mutex> sl(_registryMutex);
    fassert(16534, _registry.count(connStr) == 1);
    return new MockDBClientConnection(_registry[connStr], true);
}

MockConnRegistry::MockConnHook::MockConnHook(MockConnRegistry* registry) : _registry(registry) {}

MockConnRegistry::MockConnHook::~MockConnHook() {}

mongo::DBClientBase* MockConnRegistry::MockConnHook::connect(const ConnectionString& connString,
                                                             std::string& errmsg,
                                                             double socketTimeout) {
    const string hostName(connString.toString());
    MockDBClientConnection* conn = _registry->connect(hostName);

    if (!conn->connect(hostName.c_str(), errmsg)) {
        // Assumption: connect never throws, so no leak.
        delete conn;

        // mimic ConnectionString::connect for MASTER type connection to return NULL
        // if the destination is unreachable.
        return NULL;
    }

    return conn;
}
}
