from struct import unpack
import time

def parse_data(data, structure):
    """解析结构化数据"""
    result = {"raw_data": list(data)}
    
    if not structure:
        return result
        
    result["parsed"] = {}
    for field in structure:
        offset = field["offset"]
        name = field["name"]
        data_type = field["type"]
        
        try:
            if data_type == "int":
                if offset + 2 > len(data):
                    raise ValueError("Offset out of bounds")
                val = unpack(">h", data[offset:offset+2])[0]
            elif data_type == "dint":
                if offset + 4 > len(data):
                    raise ValueError("Offset out of bounds")
                val = unpack(">l", data[offset:offset+4])[0]
            elif data_type == "real":
                if offset + 4 > len(data):
                    raise ValueError("Offset out of bounds")
                val = unpack(">f", data[offset:offset+4])[0]
            elif data_type == "bool":
                bit = field.get("bit", 0)
                if offset >= len(data):
                    raise ValueError("Offset out of bounds")
                byte = data[offset]
                val = bool((byte >> bit) & 1)
            elif data_type == "byte":
                if offset >= len(data):
                    raise ValueError("Offset out of bounds")
                val = data[offset]
            elif data_type == "word":
                if offset + 2 > len(data):
                    raise ValueError("Offset out of bounds")
                val = (data[offset] << 8) | data[offset + 1]
            elif data_type == "dword":
                if offset + 4 > len(data):
                    raise ValueError("Offset out of bounds")
                val = (data[offset] << 24) | (data[offset+1] << 16) | (data[offset+2] << 8) | data[offset+3]
            else:
                val = f"Unknown type: {data_type}"
                
            result["parsed"][name] = val
        except Exception as e:
            result["parsed"][name] = f"Error: {str(e)}"
    
    return result