from .BxDataPack import dpParse
from .BxCmdCode import CMD_ACK, CMD_SYSTEM_STATE
from .bxError import bxErrors


class BxResp:
    def __init__(self):
        self.group = 0
        self.cmd = 0
        self.Err = 0
        self.r0 = 0
        self.r1 = 0
        self.Data = bytearray()

    def Parse(self, src, length):
        """解析响应数据"""
        dp = dpParse(src, length)
        if dp is None:
            return None
        else:
            return self._parse(dp)

    def _parse(self, pack):
        """解析数据打包"""
        offset = 0
        resp = BxResp()
        resp.group = pack.data[offset]
        offset += 1
        resp.cmd = pack.data[offset]
        offset += 1
        resp.Err = pack.data[offset]
        offset += 1
        resp.r0 = pack.data[offset]
        offset += 1
        resp.r1 = pack.data[offset]
        offset += 1
        resp.Data = pack.data[offset:(offset + len(pack.data) - 5)]
        return resp

    def IsAck(self):
        """是否是确认响应"""
        return self.group == CMD_ACK.group and self.cmd == CMD_ACK.code

    def NoError(self):
        """是否无错误"""
        return self.Err == 0

    def Error(self):
        """获取错误信息"""
        return bxErrors.get(self.Err, "未知错误")

    def IsInfo(self):
        """是否是返回"控制器状态"信息"""
        return self.group == CMD_SYSTEM_STATE.group and self.cmd == CMD_SYSTEM_STATE.code