#include <cstddef>
#include <cstdint>
#include <iostream>
#include <signal.h>
#include <stdexcept>
#include <string>
#include <sys/types.h>
#include <unistd.h>
#include <vector>

#include "app.hpp"          // for app_info struct
#include "file.hpp"         // for parce_args
#include "log.h"            // for logging
#include "net.hpp"          // for socket operations
#include "server_structs.h" // for api_packet and ACSP_MessageType
#include "session.hpp"      // for SessionManager

const u_int8_t UPDATE_INTERVAL = 120; // in milliseconds

using namespace std;

volatile bool STOP_PROGRAM = false;

void signal_handler(int signum) {
	if (signum == SIGINT || signum == SIGTERM) {
		STOP_PROGRAM = true;
	}
}

int main(int argc, char *argv[]) {
	app_info app = parce_args(argc, argv);
	api_packet packet;

	Socket sock;

	SessionManager session_manager(app.app_id); // Server ID 1 for now

	char buffer[2048];

	try {
		// Connect socket to API
		// sock.connect_unix(app.app_api_socket_path.c_str(), app.app_port_out);
		// Connect socket to Server
		sock.connect_server(app.app_server_out_ip.c_str(), app.app_port_out);
		sock.bind_server("127.0.0.1", app.app_port_in);

		// Await server for initial data
		sock.receive_server(buffer, sizeof(buffer));
		log_info("Connected to server, awaiting version confirmation...\n");

		if (buffer[0] == ACSP_VERSION) {
			log_info("Server version confirmed. Sending update rate request @ %ums\n", UPDATE_INTERVAL);
		} else {
			throw runtime_error("Did not receive version confirmation from server.");
		}

		char request[516] = {0};
		request[0] = ACSP_REALTIMEPOS_INTERVAL;
		request[1] = UPDATE_INTERVAL;

		sock.send_server(request, sizeof(request));
		log_debug("Info:\n");
		log_debug("\tApp ID: %d\n", app.app_id);
        log_debug("\tAPI Socket Path: %s\n", app.app_api_socket_path.c_str());
        log_debug("\tServer Out IP: %s\n", app.app_server_out_ip.c_str());
        log_debug("\tApp Port In: %d\n", app.app_port_in);
        log_debug("\tApp Port Out: %d\n", app.app_port_out);

	} catch (const runtime_error &e) {
		cerr << "Error: " << e.what() << endl;
		return 1;
	}

	// TODO:  Implement Cache
	// TAG:     Because sometimes the parser doesnt have the name of the server because it started after the server init
	//          we can cache it and reuse it to avoid NULL names in the DB

	while (STOP_PROGRAM == false) {
		// Receive data from server
		ssize_t received = sock.receive_server(buffer, sizeof(buffer));
		if (received > 0) {
			switch (buffer[0]) {
                // DONE: 
			case ACSP_VERSION: {
				log_warn("Received Version Again? (Probably server restart) Resending Update Request @ %ums\n", UPDATE_INTERVAL);

				char request[516] = {0};
				request[0] = ACSP_REALTIMEPOS_INTERVAL;
				request[1] = UPDATE_INTERVAL;
				sock.send_server(request, sizeof(request));

				break;
			}
                
                // TODO: 
			case ACSP_CAR_UPDATE: {
                log_info("Received car update.\n"); 
				break;
			}
                
                // TODO: 
			case ACSP_NEW_SESSION: {
				log_info("New session started.\n");
				break;
			}

			default: {
				break;
			}
			}
		}
	}

	return 0;
}