import sys
import re

def create_text_sysex(text):
    if not text:
        text = "EMPTY"
    
    if len(text) > 32:
        print("Text cannot be longer than 32 symbols.")
        sys.exit(1)
        
    model_id = 0x45
    address = [0x10, 0x00, 0x00]
    
    text_bytes = [ord(char) for char in text]
    
    def calc_checksum(addr, payload):
        total = sum(addr) + sum(payload)
        return (128 - (total % 128)) % 128

    checksum = calc_checksum(address, text_bytes)
    
    full_packet = bytes([0xF0, 0x41, 0x10, model_id, 0x12] + address + text_bytes + [checksum] + [0xF7])
    
    return full_packet

def sanitize_filename(text):
    name = text.replace(" ", "_")
    name = re.sub(r'[\\/*?:"<>|]', "", name)
    name = name.strip(". ")
    return name if name else "output"

if __name__ == "__main__":
    input_text = " ".join(sys.argv[1:])
    
    if not input_text:
        print("Usage: python sc55text.py [text]")
        sys.exit(1)

    sysex_data = create_text_sysex(input_text)

    safe_name = sanitize_filename(input_text)
    filename = f"{safe_name}.syx"
    
    try:
        with open(filename, "wb") as f:
            f.write(sysex_data)
        print(f"Output file: {filename}")
        print("HEX:", " ".join(f"{b:02X}" for b in sysex_data))
    except Exception as e:
        print(f"Error occurred while saving the file: {e}")