// Copyright(c) 2015-present, Gabi Melman & spdlog contributors.
// Distributed under the MIT License (http://opensource.org/licenses/MIT)

#pragma once

//
// Custom sink for mongodb
// Building and using requires mongocxx library.
// For building mongocxx library check the url below
// http://mongocxx.org/mongocxx-v3/installation/
//

#include "spdlog/common.h"
#include "spdlog/details/log_msg.h"
#include "spdlog/sinks/base_sink.h"
#include <spdlog/details/synchronous_factory.h>

#include <bsoncxx/builder/stream/document.hpp>
#include <bsoncxx/types.hpp>
#include <bsoncxx/view_or_value.hpp>

#include <mongocxx/client.hpp>
#include <mongocxx/instance.hpp>
#include <mongocxx/uri.hpp>

namespace spdlog {
namespace sinks {
template<typename Mutex>
class mongo_sink : public base_sink<Mutex>
{
public:
    mongo_sink(const std::string &db_name, const std::string &collection_name, const std::string &uri = "mongodb://localhost:27017")
    try : mongo_sink(std::make_shared<mongocxx::instance>(), db_name, collection_name, uri)
    {}
    catch (const std::exception &e)
    {
        throw_spdlog_ex(fmt_lib::format("Error opening database: {}", e.what()));
    }

    mongo_sink(std::shared_ptr<mongocxx::instance> instance, const std::string &db_name, const std::string &collection_name,
        const std::string &uri = "mongodb://localhost:27017")
        : instance_(std::move(instance))
        , db_name_(db_name)
        , coll_name_(collection_name)
    {
        try
        {
            client_ = spdlog::details::make_unique<mongocxx::client>(mongocxx::uri{uri});
        }
        catch (const std::exception &e)
        {
            throw_spdlog_ex(fmt_lib::format("Error opening database: {}", e.what()));
        }
    }

    ~mongo_sink()
    {
        flush_();
    }

protected:
    void sink_it_(const details::log_msg &msg) override
    {
        using bsoncxx::builder::stream::document;
        using bsoncxx::builder::stream::finalize;

        if (client_ != nullptr)
        {
            auto doc = document{} << "timestamp" << bsoncxx::types::b_date(msg.time) << "level" << level::to_string_view(msg.level).data()
                                  << "level_num" << msg.level << "message" << std::string(msg.payload.begin(), msg.payload.end())
                                  << "logger_name" << std::string(msg.logger_name.begin(), msg.logger_name.end()) << "thread_id"
                                  << static_cast<int>(msg.thread_id) << finalize;
            client_->database(db_name_).collection(coll_name_).insert_one(doc.view());
        }
    }

    void flush_() override {}

private:
    std::shared_ptr<mongocxx::instance> instance_;
    std::string db_name_;
    std::string coll_name_;
    std::unique_ptr<mongocxx::client> client_ = nullptr;
};

#include "spdlog/details/null_mutex.h"
#include <mutex>
using mongo_sink_mt = mongo_sink<std::mutex>;
using mongo_sink_st = mongo_sink<spdlog::details::null_mutex>;

} // namespace sinks

template<typename Factory = spdlog::synchronous_factory>
inline std::shared_ptr<logger> mongo_logger_mt(const std::string &logger_name, const std::string &db_name,
    const std::string &collection_name, const std::string &uri = "mongodb://localhost:27017")
{
    return Factory::template create<sinks::mongo_sink_mt>(logger_name, db_name, collection_name, uri);
}

template<typename Factory = spdlog::synchronous_factory>
inline std::shared_ptr<logger> mongo_logger_st(const std::string &logger_name, const std::string &db_name,
    const std::string &collection_name, const std::string &uri = "mongodb://localhost:27017")
{
    return Factory::template create<sinks::mongo_sink_st>(logger_name, db_name, collection_name, uri);
}

} // namespace spdlog