package models

import "strings"

// ResolveCPUSerialNumber returns a source-backed processor inventory identity.
// A vendor-provided serial number has priority; PPIN is the documented CPU
// serial identity and is used when a separate serial number is unavailable.
func ResolveCPUSerialNumber(serialNumber, ppin string) string {
	if serial := validCPUIdentity(serialNumber); serial != "" {
		return serial
	}
	return validCPUIdentity(ppin)
}

func validCPUIdentity(value string) string {
	value = strings.TrimSpace(value)
	switch strings.ToLower(value) {
	case "", "-", "n/a", "na", "none", "null", "unknown", "not available", "to be filled by o.e.m.":
		return ""
	default:
		return value
	}
}