import re, sys

def load_dbc_file(file_path):
    try:
        with open(file_path, 'r') as file:
            content = file.read()
        # print(f"[INFO] Successfully loaded DBC file: {file_path}")

        # 메시지와 시그널을 추출하는 정규 표현식
        message_pattern = re.compile(r'BO_\s+(\d+)\s+(\w+)\s*:\s*(\d+)\s+(\w+)')
        signal_pattern = re.compile(r'SG_\s+(\w+)\s*:\s*(\d+)\|(\d+)@(\d+)([+-])\s*\(([^,]+),\s*([^)]+)\)\s*\[[^\]]+\]\s*\"[^\"]*\"\s+(\w+)')

        # 메시지와 시그널 매칭
        messages = {}
        current_message = None

        for line in content.splitlines():
            line = line.strip()
            if not line:
                current_message = None
                continue

            message_match = message_pattern.match(line)
            if message_match:
                decimal_id = int(message_match.group(1))
                hex_id = f"0x{decimal_id:03X}"
                message_name = message_match.group(2)
                dlc = int(message_match.group(3))
                tx_ecu_name = message_match.group(4)
                current_message = message_name
                messages[current_message] = {
                    "ID": hex_id,
                    "DLC": dlc,
                    "TX ECU name": tx_ecu_name,
                    "Signals": []
                }
            elif current_message:
                signal_match = signal_pattern.match(line)
                if signal_match:
                    signal_name = signal_match.group(1)
                    msb = int(signal_match.group(2))
                    length = int(signal_match.group(3))
                    byte_order = int(signal_match.group(4))
                    sign = signal_match.group(5)
                    factor = float(signal_match.group(6))
                    offset = float(signal_match.group(7))
                    rx_ecu_name = signal_match.group(8)
                    messages[current_message]["Signals"].append({
                        "Signal name": signal_name,
                        "msb": msb,
                        "Length": length,
                        "Byte order": byte_order,
                        "Sign": sign,
                        "Factor": factor,
                        "Offset": offset,
                        "RX ECU name": rx_ecu_name
                    })

        return messages

    except Exception as e:
        print(f"[ERROR] Failed to parse DBC file: {e}")
        return None

if __name__ == "__main__":
    file_path = sys.argv[1]
    messages = load_dbc_file(file_path)

    if messages:
        for message_name, message_info in messages.items():
            print(f"[INFO] Message: {message_name}, Info: {message_info['ID']}, {message_info['DLC']}, {message_info['TX ECU name']}")
            for signal in message_info['Signals']:
                print(f"  └ Signal: {signal}")