#include <boost/asio.hpp>
#include <boost/asio/steady_timer.hpp>
#include <csignal>
#include <functional>
#include <iostream>
#include <string>

#include "alarm/alarm_service.h"
#include "config/config_manager.h"
#include "dataCache/cache_uploader.h"
#include "dataCache/data_cache.h"
#include "dataCache/live_data_cache.h"
#include "dataStorage/data_storage.h"
#include "deviceManager/device_manager.h"
#include "mqtt/mqtt_client.h"
#include "mqtt/mqtt_router.h"
#include "network/tcp_server.h"
#include "nlohmann/json.hpp"
#include "spdlog/spdlog.h"
#include "systemMonitor/system_monitor.h"
#include "videoService/video_pipeline.hpp"
#include "web/web_server.h"

boost::asio::io_context g_io_context;

void poll_system_metrics(boost::asio::steady_timer& timer, SystemMonitor::SystemMonitor& monitor,
						 MqttClient& mqtt_client, AlarmService& alarm_service) {
	if (g_io_context.stopped())
		return;
	auto cpu_util = monitor.getCpuUtilization();
	auto mem_info = monitor.getMemoryInfo();
	double mem_total_gb = mem_info.total_kb / 1024.0 / 1024.0;

	double mem_usage_percentage =
		(mem_info.total_kb > 0)
			? (100.0 * (mem_info.total_kb - mem_info.available_kb) / mem_info.total_kb)
			: 0.0;

	auto thermalInfoString = monitor.getChipTemperature();

	std::string topic = "proxy/system_status";
	std::string payload;

	try {
		nlohmann::json payload_json;
		payload_json["cpu_usage"] = cpu_util.totalUsagePercentage;
		payload_json["mem_total_gb"] = mem_total_gb;
		payload_json["mem_usage_percentage"] = mem_usage_percentage;
		payload_json["thermal_info"] = nlohmann::json::parse(thermalInfoString);

		payload = payload_json.dump();
	} catch (const nlohmann::json::parse_error& e) {
		spdlog::error("Failed to parse thermalInfo JSON: {}. Sending partial data.", e.what());
		nlohmann::json fallback_json;
		fallback_json["cpu_usage"] = cpu_util.totalUsagePercentage;
		fallback_json["mem_total_gb"] = mem_total_gb;
		fallback_json["mem_usage_percentage"] = mem_usage_percentage;
		fallback_json["thermal_info_error"] = "parsing_failed";
		fallback_json["raw_thermal_info"] = thermalInfoString;

		payload = fallback_json.dump();
	}

	alarm_service.process_system_data(payload);

	mqtt_client.publish(topic, payload);
	spdlog::debug("System metrics published.");

	timer.expires_at(timer.expiry() + std::chrono::seconds(15));
	timer.async_wait(std::bind(poll_system_metrics, std::ref(timer), std::ref(monitor),
							   std::ref(mqtt_client), std::ref(alarm_service)));
}

int main(int argc, char* argv[]) {
	// TODO: [GYK] DEV#1: 将 URL 放入 config.json 中读取
	std::string cam_rtsp_input = "rtsp://admin:123456@192.168.1.57:554/stream0";
	std::string algorithm_rtsp_output = "rtsp://127.0.0.1:8554/processed";
	const std::string config_path = "/app/config/config.json";
	if (!ConfigManager::getInstance().load(config_path)) {
		std::cerr << "Failed to load configuration from " << config_path
				  << ". Running with defaults, but this may cause issues." << std::endl;
	}

	auto& config = ConfigManager::getInstance();

	try {
		spdlog::set_level(spdlog::level::from_str(config.getLogLevel()));
		spdlog::info("Edge Proxy starting up...");
	} catch (const spdlog::spdlog_ex& ex) {
		std::cerr << "Log initialization failed: " << ex.what() << std::endl;
		return 1;
	}

	spdlog::info("Initializing Data Storage...");
	auto& data_storage = DataStorage::getInstance();
	if (!data_storage.initialize(config.getDataStorageDbPath())) {
		spdlog::critical("Failed to initialize DataStorage. Exiting.");
		return 1;
	}

	try {
		spdlog::info("Initializing Video Service...");

		DataCache data_cache;
		LiveDataCache live_data_cache;
		MqttClient mqtt_client(config.getMqttBroker(), config.getMqttClientID());

		AlarmService alarm_service(g_io_context, mqtt_client);

		VideoPipeline video_pipeline;

		if (!alarm_service.load_rules(config.getAlarmRulesPath())) {
			spdlog::error("Failed to load alarm rules. Alarms may be disabled.");
		}

		auto report_to_mqtt = [&](const UnifiedData& data) {
			if (data_storage.storeProcessedData(data)) {
				spdlog::debug("Successfully stored PROCESSED data for device '{}'", data.device_id);
			} else {
				spdlog::error("Failed to store PROCESSED data for device '{}'", data.device_id);
			}

			live_data_cache.update_data(data.device_id, data.data_json);

			alarm_service.process_device_data(data.device_id, data.data_json);

			if (mqtt_client.is_connected()) {
				std::string topic = "devices/" + data.device_id + "/data";
				g_io_context.post([&, topic, payload = data.data_json]() {
					mqtt_client.publish(topic, payload, 1, false);
				});
			} else {
				spdlog::warn("MQTT disconnected. Caching data for device '{}'.", data.device_id);
				data_cache.add(data);
			}
		};

		DeviceManager device_manager(g_io_context, report_to_mqtt);
		MqttRouter mqtt_router(mqtt_client, device_manager);

		std::vector<uint16_t> listen_ports = config.getTcpServerPorts();
		TCPServer tcp_server(g_io_context, listen_ports, mqtt_client);
		SystemMonitor::SystemMonitor monitor;

		if (!data_cache.open(config.getDataCacheDbPath())) {
			spdlog::critical("Failed to initialize data cache at '{}'. Exiting.",
							 config.getDataCacheDbPath());
			return 1;
		}
		CacheUploader cache_uploader(g_io_context, mqtt_client, data_cache);

		mqtt_client.set_connected_handler([&](const std::string& cause) {
			spdlog::info("MQTT client connected: {}", cause);
			cache_uploader.start_upload();
		});

		mqtt_client.connect();
		mqtt_router.start();

		monitor.getCpuUtilization();
		boost::asio::steady_timer system_monitor_timer(g_io_context, std::chrono::seconds(15));

		system_monitor_timer.async_wait(std::bind(poll_system_metrics,
												  std::ref(system_monitor_timer), std::ref(monitor),
												  std::ref(mqtt_client), std::ref(alarm_service)));

		device_manager.load_and_start(config.getDevicesConfigPath());

		WebServer web_server(monitor, device_manager, live_data_cache, alarm_service,
							 config.getWebServerPort());
		web_server.set_shutdown_handler([&]() {
			spdlog::warn("Received shutdown command from Web API. Shutting down.");
			g_io_context.stop();
		});
		web_server.start();

		spdlog::info("Starting Video Pipeline Service...");
		video_pipeline.Start(cam_rtsp_input, algorithm_rtsp_output);

		boost::asio::signal_set signals(g_io_context, SIGINT, SIGTERM);
		signals.async_wait([&](const boost::system::error_code& error, int signal_number) {
			spdlog::warn("Interrupt signal ({}) received. Shutting down.", signal_number);

			spdlog::info("[Shutdown] A. Stopping device manager services...");
			device_manager.stop_all();

			spdlog::info("[Shutdown] B. Stopping web server...");
			web_server.stop();

			spdlog::info("[Shutdown] B2. Stopping video pipeline...");
			video_pipeline.Stop();

			spdlog::info("[Shutdown] C. Stopping alarm service...");
			alarm_service.stop();

			spdlog::info("[Shutdown] D. Disconnecting from MQTT broker...");
			mqtt_client.disconnect();

			spdlog::info("[Shutdown] E. Stopping main event loop...");
			g_io_context.stop();
		});

		spdlog::info("All services are running. Press Ctrl+C to exit.");
		g_io_context.run();
	} catch (const std::exception& e) {
		spdlog::critical("An unhandled exception occurred: {}", e.what());
		return 1;
	}

	spdlog::info("Server has been shut down gracefully. Exiting.");
	return 0;
}