#include "tcp_client.hpp"
#include "logger.hpp"

#include <memory>

static std::unique_ptr<TcpClient> uplink_notify_client;

static std::atomic<bool> heartbeat_running{false};
static std::atomic<bool> heartbeat_ack_received{false}; // 是否收到应答
static std::thread heartbeat_thread;

static void heartbeat_task()
{
    while (heartbeat_running.load())
    {
        if (uplink_notify_client && uplink_notify_client->is_connected())
        {
            heartbeat_ack_received = false;
            // 构造并发送心跳包
            FullPacket heartPacket = ProtocolCodec::create_heartbeat_packet(g_mqtt_config.vin);
            std::vector<uint8_t> raw = ProtocolCodec::encode_full_packet(heartPacket);
            std::string payload(reinterpret_cast<const char *>(raw.data()), raw.size());
            uplink_notify_client->send_data(payload);
            LOG_INFO("[uplink_notify] Sent heartbeat.");

            // 等待10秒期间，判断是否收到回应
            for (int i = 0; i < 10; ++i)
            {
                std::this_thread::sleep_for(std::chrono::seconds(1));
                if (!heartbeat_running.load())
                    return;
            }

            if (!heartbeat_ack_received.load())
            {
                LOG_WARN("[uplink_notify] Heartbeat ACK not received within 10 seconds.");
            }
        }
        else
        {
            LOG_WARN("[uplink_notify] Not connected, stop sending heartbeat.");
            std::this_thread::sleep_for(std::chrono::seconds(10));
        }
    }
    LOG_INFO("[uplink_notify] Heartbeat thread exited.");
}

// 接收处理逻辑
static void handle_uplink_notify_message(const std::string &data)
{
    LOG_INFO("[uplink_notify] Received data, length = " + std::to_string(data.size()) + " bytes");

    std::vector<uint8_t> bytes(data.begin(), data.end());
    auto pkt_opt = ProtocolCodec::decode_full_packet(bytes);

    if (!pkt_opt.has_value())
    {
        LOG_WARN("[uplink_notify] Invalid packet received.");
        return;
    }

    const FullPacket &pkt = pkt_opt.value();

    if (pkt.command_id == 0x07 && pkt.response_flag == 0x01 && pkt.data_length == 0)
    {
        heartbeat_ack_received = true;
        LOG_INFO("[uplink_notify] Received heartbeat ACK.");
    }
    else if (pkt.command_id == 0xD4 && pkt.response_flag == 0xfe && pkt.data_length > 0) // 车辆通知信息
    {
        LOG_INFO("[uplink_notify] Received vehicle notify packet.");

        auto data_opt = ProtocolCodec::parse_vehicle_message(pkt.data_unit);
        if (!data_opt)
        {
            LOG_ERROR("[uplink_notify] Failed to parse vehicle data packet.");
            std::vector<uint8_t> raw_reply = ProtocolCodec::make_ack_response(pkt, false);
            std::string str_reply(reinterpret_cast<const char *>(raw_reply.data()), raw_reply.size());
            uplink_notify_client->send_data(str_reply); // 解析失败回复
            return;
        }
        else
        {
            std::vector<uint8_t> raw_reply = ProtocolCodec::make_ack_response(pkt, true);
            std::string str_reply(reinterpret_cast<const char *>(raw_reply.data()), raw_reply.size());
            uplink_notify_client->send_data(str_reply); // 解析成功回复
        }

        const auto &data_msg = *data_opt;
        LOG_INFO("[uplink_notify] JSON Payload = " + data_msg.json_payload);

        if (mqtt_client && mqtt_client->isConnected())
        {
            mqtt_client->publish(g_mqtt_config.topics.uplink_2, data_msg.json_payload, g_mqtt_config.qos);
        }
        else
        {
            LOG_WARN("[uplink_notify] MQTT not connected, failed to publish vehicle notify.");
        }
    }
    else
    {
        LOG_ERROR("[uplink_notify] Unknown command flag.");
    }
}

// 状态变化处理逻辑
static void handle_uplink_notify_status(bool connected)
{
    LOG_INFO("[uplink_notify] status: " + std::string(connected ? "connected" : "disconnected"));

    if (connected)
    {
        if (!heartbeat_running.load())
        {
            heartbeat_running = true;
            heartbeat_thread = std::thread(heartbeat_task);
            LOG_INFO("[uplink_notify] Heartbeat thread started.");
        }
    }
    else
    {
        if (heartbeat_running.load())
        {
            heartbeat_running = false;
            if (heartbeat_thread.joinable())
            {
                heartbeat_thread.join();
                LOG_INFO("[uplink_notify] Heartbeat thread stopped.");
            }
        }
    }
}

void start_uplink_notify_client(const std::string &ip, int port)
{
    uplink_notify_client = std::make_unique<TcpClient>("uplink_notify", ip, port);

    uplink_notify_client->set_receive_callback(handle_uplink_notify_message);

    uplink_notify_client->set_status_callback(handle_uplink_notify_status);

    uplink_notify_client->start();
}