import struct
from .BxCmd import baseBxCmd
from .BxCmdCode import CMD_FILE_DELETE


class CmdDeleteFile(baseBxCmd):
    def __init__(self, files):
        super().__init__(CMD_FILE_DELETE.group, CMD_FILE_DELETE.code)
        self.files = files if files else []

    def Build(self):
        result = bytearray()
        # 写入命令组
        result.append(self.Group())
        # 写入命令
        result.append(self.Cmd())
        # 写入响应标志
        result.append(self.ReqResp())
        # 写入保留值
        result.extend([0x00, 0x00])
        
        l = len(self.files)
        if l != 0:
            result.extend(struct.pack('<H', l))
            for v in self.files:
                result.extend(v.encode('ascii'))
            return bytes(result)
        
        result.append(0x00)
        return bytes(result)


def NewCmdDeleteFile(files):
    return CmdDeleteFile(files)