import json
import serial
import sys
import time
from pathlib import Path


def main():
    # Load config
    root = Path(__file__).resolve().parent.parent
    config_file = root / "settings.json"
    if not config_file.exists():
        print(f"Error: settings.json not found at {config_file}")
        sys.exit(1)

    with open(config_file) as f:
        cfg = json.load(f)

    port = cfg.get("port", "COM3")
    baud = cfg.get("monitor_baud", 115200)

    print(f"[Serial Monitor] Connecting to {port} at {baud} baud...")

    try:
        with serial.Serial(port, baud, timeout=0.5) as ser:
            # 🔧 Clear DTR and RTS lines (common for ESP32 reset handling)
            ser.dtr = False
            ser.rts = False
            
            print("[Serial Monitor] Press Ctrl+C to exit.\n")
            while True:
                if ser.in_waiting:
                    line = ser.readline().decode(errors="replace")
                    if line:
                        print(line, end="")

                time.sleep(0.01)
    except KeyboardInterrupt:
        print("\n[Serial Monitor] Disconnected.")
    except serial.SerialException as e:
        print(f"[Error] Could not open serial port {port}: {e}")
        sys.exit(1)

if __name__ == "__main__":
    main()