// mqtt_client_wrapper.cpp
#include "mqtt_client_wrapper.hpp"

#include <algorithm>
#include <chrono>
#include <condition_variable>
#include <mutex>
#include <nlohmann/json.hpp>
#include <queue>
#include <thread>

std::shared_ptr<MQTTClient> mqtt_client;
std::atomic<bool> mqtt_restart_required{false};
extern std::atomic<bool> g_running;
std::atomic<bool> g_streaming{false};
std::string g_dispatch_id;
std::mutex g_dispatch_id_mutex;

static void send_heartbeat()
{
    if (!mqtt_client || !mqtt_client->isConnected()) return;

    // 获取当前时间戳（13位毫秒）
    auto now = std::chrono::system_clock::now();
    auto ms = std::chrono::duration_cast<std::chrono::milliseconds>(now.time_since_epoch()).count();

    // 获取当前所有通道状态
    auto status_list = RTMPManager::get_all_status();

    int total = static_cast<int>(status_list.size());
    int running_count = 0;
    nlohmann::json channels = nlohmann::json::array();

    for (int i = 0; i < total; ++i)
    {
        const auto &[key, running] = status_list[i];
        if (running) running_count++;

        nlohmann::json item;
        item["loc"] = i;  // 摄像头位置索引
        item["url"] = RTMPManager::get_stream_url(g_app_config.cameras[i].name);
        item["running"] = running;
        channels.push_back(item);
    }

    nlohmann::json hb;
    hb["timestamp"] = ms;
    hb["status"] = (running_count == total) ? 1 : (running_count == 0 ? 0 : 2);
    hb["channels"] = channels;

    mqtt_client->publish(g_app_config.mqtt.topics.heartbeat_up, hb.dump());
    LOG_INFO("[MQTT] Sent video heartbeat: " + hb.dump());
}

// MQTT 回调
static void on_mqtt_connected() { LOG_INFO("[MQTT] Connected to broker: " + g_app_config.mqtt.server_ip); }

static void on_mqtt_disconnected() { LOG_WARN("[MQTT] Disconnected from broker: " + g_app_config.mqtt.server_ip); }

static void on_mqtt_message_received(const std::string &topic, const std::string &message)
{
    try
    {
        auto j = nlohmann::json::parse(message);

        LOG_INFO("[MQTT] Received message on topic [" + topic + "], len = " + std::to_string(message.size()));
        LOG_INFO("[MQTT] Message content: " + j.dump(-1));
    }
    catch (const std::exception &e)
    {
        LOG_ERROR(std::string("[MQTT] Failed to process incoming JSON: ") + e.what());
    }
}

void mqtt_client_thread_func()
{
    const auto &cfg = g_app_config.mqtt;
    auto heartbeat_interval = std::chrono::milliseconds(static_cast<int>(cfg.keep_alive * 0.9));

    while (g_running)
    {
        mqtt_client = std::make_unique<MQTTClient>(cfg);
        mqtt_client->setConnectCallback(on_mqtt_connected);
        mqtt_client->setDisconnectCallback(on_mqtt_disconnected);
        mqtt_client->setMessageCallback(on_mqtt_message_received);

        // 等待连接
        while (g_running && !mqtt_client->isConnected())
        {
            mqtt_client->connect();
            for (int i = 0; i < 10 && g_running && !mqtt_client->isConnected(); i++)
                std::this_thread::sleep_for(std::chrono::milliseconds(50));

            if (!g_running && !mqtt_client->isConnected()) mqtt_client->force_disconnect();
        }

        // 主循环：心跳
        while (g_running && mqtt_client->isConnected())
        {
            send_heartbeat();

            auto sleep_time = heartbeat_interval;
            while (sleep_time.count() > 0 && g_running && mqtt_client->isConnected())
            {
                auto chunk = std::min(sleep_time, std::chrono::milliseconds(50));
                std::this_thread::sleep_for(chunk);
                sleep_time -= chunk;
            }

            if (!g_running && mqtt_client->isConnected()) mqtt_client->force_disconnect();
        }

        // 清理
        if (mqtt_client)
        {
            if (g_running)
                mqtt_client->disconnect();
            else
                mqtt_client->force_disconnect();
            mqtt_client.reset();
        }

        mqtt_restart_required = false;

        if (!g_running) break;

        // 短暂等待再重连
        for (int i = 0; i < 5 && g_running; i++) std::this_thread::sleep_for(std::chrono::milliseconds(200));
    }
    LOG_INFO("[MQTT] Client thread exiting.");
}