errNonTimestampArg   = errors.New("Expected a timestamp argument")
)

func (e *FuncExpr) getFunctionName() FuncName {
	switch {
	case e.SFunc != nil:
		return FuncName(strings.ToUpper(e.SFunc.FunctionName))
	case e.Count != nil:
		return aggFnCount
	case e.Cast != nil:
		return sqlFnCast
	case e.Substring != nil:
		return sqlFnSubstring
	case e.Extract != nil:
		return sqlFnExtract

		if field.DataType == Time {
			field.AutoCreateTime = UnixTime
		} else if strings.ToUpper(v) == "NANO" {
			field.AutoCreateTime = UnixNanosecond
		} else if strings.ToUpper(v) == "MILLI" {
			field.AutoCreateTime = UnixMillisecond
		} else {
			field.AutoCreateTime = UnixSecond
		}
	}

func ExampleToUpper() {
	fmt.Printf("%s", bytes.ToUpper([]byte("Gopher")))
	// Output: GOPHER
}

func ExampleToUpperSpecial() {
	str := []byte("ahoj vývojári golang")
	totitle := bytes.ToUpperSpecial(unicode.AzeriCase, str)
	fmt.Println("Original : " + string(str))
	fmt.Println("ToUpper : " + string(totitle))
	// Output:
	// Original : ahoj vývojári golang
	// ToUpper : AHOJ VÝVOJÁRİ GOLANG

}

func getEnvVarName(subSys, target, param string) string {
	if target == Default {
		return fmt.Sprintf("%s%s%s%s", EnvPrefix, strings.ToUpper(subSys), Default, strings.ToUpper(param))
	}

	return fmt.Sprintf("%s%s%s%s%s%s", EnvPrefix, strings.ToUpper(subSys), Default, strings.ToUpper(param),
		Default, target)
}

var resolvableSubsystems = set.CreateStringSet(IdentityOpenIDSubSys, IdentityLDAPSubSys, PolicyPluginSubSys)

func (r RetMode) Valid() bool {
	switch r {
	case RetGovernance, RetCompliance:
		return true
	}
	return false
}

func parseRetMode(modeStr string) (mode RetMode) {
	switch strings.ToUpper(modeStr) {
	case "GOVERNANCE":
		mode = RetGovernance
	case "COMPLIANCE":
		mode = RetCompliance
	}
	return mode
}

// LegalHoldStatus - object legal hold status.
type LegalHoldStatus string

	rootCmd.Flags().Bool(name, value, usage)
	registerEnvironment(name, value, usage)
}

func registerEnvironment[T env.Parseable](name string, defaultValue T, usage string) {
	envName := strings.Replace(strings.ToUpper(name), "-", "_", -1)
	// Note: we do not rely on istio env package to retrieve configuration. We relies on viper.
	// This is just to make sure the reference doc tool can generate doc with these vars as env variable at istio.io.

	bp := copy(nb, b)
	for bp < n {
		chunk := min(bp, chunkMax)
		bp += copy(nb[bp:], nb[:chunk])
	}
	return nb
}

// ToUpper returns a copy of the byte slice s with all Unicode letters mapped to
// their upper case.
func ToUpper(s []byte) []byte {
	isASCII, hasLower := true, false
	for i := 0; i < len(s); i++ {
		c := s[i]
		if c >= utf8.RuneSelf {
			isASCII = false
			break
		}

	config.Lock()
	defer config.Unlock()

	// check if tier name is in all caps
	tierName := tier.Name
	if tierName != strings.ToUpper(tierName) {
		return errTierNameNotUppercase
	}

	// check if tier name already in use
	if _, exists := config.isTierNameInUse(tierName); exists {
		return errTierAlreadyExists
	}

	switch {
	case e.ConditionRHS.Compare != nil:
		cmpRight, cmpRErr := e.ConditionRHS.Compare.Operand.evalNode(r, tableAlias)
		if cmpRErr != nil {
			return nil, cmpRErr
		}

		b, err := opVal.compareOp(strings.ToUpper(e.ConditionRHS.Compare.Operator), cmpRight)
		return FromBool(b), err

	case e.ConditionRHS.Between != nil:
		return e.ConditionRHS.Between.evalBetweenNode(r, opVal, tableAlias)

	case e.ConditionRHS.Like != nil:

	return !c.Is(ChecksumInvalid) && !c.Is(ChecksumNone)
}

// NewChecksumType returns a checksum type based on the algorithm string.
func NewChecksumType(alg string) ChecksumType {
	switch strings.ToUpper(alg) {
	case "CRC32":
		return ChecksumCRC32
	case "CRC32C":
		return ChecksumCRC32C
	case "SHA1":
		return ChecksumSHA1
	case "SHA256":
		return ChecksumSHA256
	case "":
		return ChecksumNone