import minimalmodbus
import time
import traceback
import argparse
import serial.tools.list_ports
from src.hardware import Hardware
from src.logic import loop

def get_first_available_com_port():
    ports = list(serial.tools.list_ports.comports())
    return ports[0].device if ports else 'COM3'

def main():
    parser = argparse.ArgumentParser(description='UNO Relay Modbus Controller')
    parser.add_argument('--com_port', type=str, default=get_first_available_com_port(),
                        help='COM port for the Modbus connection')
    parser.add_argument('--slave_id', type=int, default=1,
                        help='Slave ID for the Modbus device')
    parser.add_argument('--cycle_time', type=float, default=0.01,
                        help='Cycle time in seconds for the main loop')
    args = parser.parse_args()

    com_port = args.com_port
    slave_id = args.slave_id
    cycle_time = args.cycle_time

    while True:
        try:
            instrument = minimalmodbus.Instrument(com_port, slave_id)
            instrument.serial.baudrate = 9600
            instrument.serial.bytesize = 8
            instrument.serial.parity   = minimalmodbus.serial.PARITY_NONE
            instrument.serial.stopbits = 1
            instrument.serial.timeout  = 1
            time.sleep(3)
            hardware = Hardware(instrument)
            
            while True:
                start_time = time.time()
                
                hardware.update()
                loop(hardware)
                
                execution_time = time.time() - start_time
                if execution_time > cycle_time:
                    print(f"Warning: Loop execution time ({execution_time:.4f}s) exceeded cycle time ({cycle_time:.4f}s)")
                
                sleep_time = max(0, cycle_time - execution_time)
                time.sleep(sleep_time)
                
        except KeyboardInterrupt:
            print("Stopped by user")
            break
        except Exception as e:
            print(f"Error: {e}")
            print(traceback.format_exc())
            time.sleep(5)

if __name__ == "__main__":
    main()