idiomatic project structure

internal/models/customer_attributes.go

@@ -0,0 +1,94 @@
+package models
+
+import (
+	"go-nkode/internal/security"
+	"log"
+)
+
+type CustomerAttributes struct {
+	AttrVals []uint64
+	SetVals  []uint64
+}
+
+func NewCustomerAttributes() (*CustomerAttributes, error) {
+	attrVals, err := security.GenerateRandomNonRepeatingUint64(KeypadMax.TotalAttrs())
+	if err != nil {
+		log.Print("unable to generate attribute vals: ", err)
+		return nil, err
+	}
+	setVals, err := security.GenerateRandomNonRepeatingUint64(KeypadMax.AttrsPerKey)
+	if err != nil {
+		log.Print("unable to generate set vals: ", err)
+		return nil, err
+	}
+
+	customerAttrs := CustomerAttributes{
+		AttrVals: attrVals,
+		SetVals:  setVals,
+	}
+	return &customerAttrs, nil
+}
+
+func NewCustomerAttributesFromBytes(attrBytes []byte, setBytes []byte) CustomerAttributes {
+	return CustomerAttributes{
+		AttrVals: security.ByteArrToUint64Arr(attrBytes),
+		SetVals:  security.ByteArrToUint64Arr(setBytes),
+	}
+}
+
+func (c *CustomerAttributes) Renew() error {
+	attrVals, err := security.GenerateRandomNonRepeatingUint64(KeypadMax.TotalAttrs())
+	if err != nil {
+		return err
+	}
+	setVals, err := security.GenerateRandomNonRepeatingUint64(KeypadMax.AttrsPerKey)
+	if err != nil {
+		return err
+	}
+	c.AttrVals = attrVals
+	c.SetVals = setVals
+	return nil
+}
+
+func (c *CustomerAttributes) IndexOfAttr(attrVal uint64) (int, error) {
+	// TODO: should this be mapped instead?
+	return security.IndexOf[uint64](c.AttrVals, attrVal)
+}
+
+func (c *CustomerAttributes) IndexOfSet(setVal uint64) (int, error) {
+	// TODO: should this be mapped instead?
+	return security.IndexOf[uint64](c.SetVals, setVal)
+}
+
+func (c *CustomerAttributes) GetAttrSetVal(attrVal uint64, userKeypad KeypadDimension) (uint64, error) {
+	indexOfAttr, err := c.IndexOfAttr(attrVal)
+	if err != nil {
+		return 0, err
+	}
+	setIdx := indexOfAttr % userKeypad.AttrsPerKey
+	return c.SetVals[setIdx], nil
+}
+
+func (c *CustomerAttributes) AttrValsForKp(userKp KeypadDimension) ([]uint64, error) {
+	err := userKp.IsValidKeypadDimension()
+	if err != nil {
+		return nil, err
+	}
+	return c.AttrVals[:userKp.TotalAttrs()], nil
+}
+
+func (c *CustomerAttributes) SetValsForKp(userKp KeypadDimension) ([]uint64, error) {
+	err := userKp.IsValidKeypadDimension()
+	if err != nil {
+		return nil, err
+	}
+	return c.SetVals[:userKp.AttrsPerKey], nil
+}
+
+func (c *CustomerAttributes) AttrBytes() []byte {
+	return security.Uint64ArrToByteArr(c.AttrVals)
+}
+
+func (c *CustomerAttributes) SetBytes() []byte {
+	return security.Uint64ArrToByteArr(c.SetVals)
+}