package protocol

import "fmt"

type MError uint8

var (
	// Success 成功
	Success MError = 0
	// IllegalFunction 接收到的功能码不可识别或服务端（从机）未实现其功能
	IllegalFunction MError = 1
	// IllegalDataAddress 数据地址不可接收
	IllegalDataAddress MError = 2
	// IllegalDataValue 数据不被识别
	IllegalDataValue MError = 3
	// SlaveDeviceFailure 不可恢复的错误
	SlaveDeviceFailure MError = 4
	// AcknowledgeSlave 已接受并正在处理的耗时请求，防止发生超时错误，主站可以发送一个poll(pgc)来确定消息是否处理完成
	AcknowledgeSlave MError = 5
	// SlaveDeviceBusy 从站正在处理耗时指令，从站忙
	SlaveDeviceBusy MError = 6
	// NegativeAcknowledge 从站无法处理此请求
	NegativeAcknowledge MError = 7
	// MemoryParityError 从站检测到奇偶校验错误，但仍然需要提供服务，故此返回此错误
	MemoryParityError MError = 8
	// GatewayPathUnavailable Modbus网关配置错误
	GatewayPathUnavailable MError = 10
	// GatewayTargetDeviceFailedToRespond Modbus网关，从机无法响应
	GatewayTargetDeviceFailedToRespond MError = 11
)

func (e MError) Error() string {
	return fmt.Sprintf("%d", e)
}

func (e MError) String() string {
	var str string
	switch e {
	case Success:
		str = fmt.Sprintf("Success")
	case IllegalFunction:
		str = fmt.Sprintf("IllegalFunction")
	case IllegalDataAddress:
		str = fmt.Sprintf("IllegalDataAddress")
	case IllegalDataValue:
		str = fmt.Sprintf("IllegalDataValue")
	case SlaveDeviceFailure:
		str = fmt.Sprintf("SlaveDeviceFailure")
	case AcknowledgeSlave:
		str = fmt.Sprintf("AcknowledgeSlave")
	case SlaveDeviceBusy:
		str = fmt.Sprintf("SlaveDeviceBusy")
	case NegativeAcknowledge:
		str = fmt.Sprintf("NegativeAcknowledge")
	case MemoryParityError:
		str = fmt.Sprintf("MemoryParityError")
	case GatewayPathUnavailable:
		str = fmt.Sprintf("GatewayPathUnavailable")
	case GatewayTargetDeviceFailedToRespond:
		str = fmt.Sprintf("GatewayTargetDeviceFailedToRespond")
	default:
		str = fmt.Sprintf("unknown")
	}
	return str
}