refactor: removed error sentinels for vote registration

Author: wellfernandes

pkg/mocai/entities/voteregistration/countries/brazilian_vote_registration.go

@@ -27,7 +27,7 @@ func calculateCheckDigit1(sequenceNumber string) (string, error) {
 	for i := 0; i < len(sequenceNumber); i++ {
 		digit, err := strconv.Atoi(string(sequenceNumber[i]))
 		if err != nil {
-			return "", ErrInvalidCheckDigit1
+			return "", fmt.Errorf("%s", translations.Get("en_us", "invalid_check_digit_1"))
 		}
 		sum += digit * weights[i]
 	}
@@ -48,13 +48,13 @@ func calculateCheckDigit2(stateCode, checkDigit1 string, stateCodeInt int) (stri
 	for i := 0; i < len(stateCode); i++ {
 		digit, err := strconv.Atoi(string(stateCode[i]))
 		if err != nil {
-			return "", ErrInvalidCheckDigit2
+			return "", fmt.Errorf("%s", translations.Get("en_us", "invalid_check_digit_2"))
 		}
 		sum += digit * weights[i]
 	}
 	checkDigit1Int, err := strconv.Atoi(checkDigit1)
 	if err != nil {
-		return "", ErrInvalidCheckDigit2
+		return "", fmt.Errorf("%s", translations.Get("en_us", "invalid_check_digit_2"))
 	}
 	sum += checkDigit1Int * 9
 
@@ -63,7 +63,7 @@ func calculateCheckDigit2(stateCode, checkDigit1 string, stateCodeInt int) (stri
 		checkDigit2 = 0
 	}
 
-	// Special case for states 01 SP and 02 MG
+	// special case for states 01 SP and 02 MG
 	if (stateCodeInt == 1 || stateCodeInt == 2) && checkDigit2 == 0 {
 		checkDigit2 = 1
 	}
@@ -72,35 +72,47 @@ func calculateCheckDigit2(stateCode, checkDigit1 string, stateCodeInt int) (stri
 }
 
 func NewBrazilianVoteRegistrationCustom(lang string, isFormatted bool, rnd translations.RandSource) (*BrazilianVoteRegistration, error) {
+	if lang == "" {
+		lang = "en_us"
+	}
+
+	supported := false
+	if translations.Get(lang, "invalid_vote_registration") != "invalid_vote_registration" {
+		supported = true
+	}
+	if !supported {
+		lang = "en_us"
+	}
+
 	if rnd == nil {
 		rnd = translations.DefaultRandSource()
 	}
 
-	// Generate a random 3-digit section and zone
+	// generate a random 3-digit section and zone
 	section := fmt.Sprintf("%03d", rnd.Intn(1000))
 	zone := fmt.Sprintf("%03d", rnd.Intn(1000))
 
-	// Generate an 8-digit sequence number
+	// generate an 8-digit sequence number
 	sequenceNumber := rnd.Intn(99999999) + 1
 	sequenceNumberStr := fmt.Sprintf("%08d", sequenceNumber)
 
-	// Generate a random state code 01 to 28
+	// generate a random state code 01 to 28
 	stateCode := rnd.Intn(28) + 1
 	stateCodeStr := fmt.Sprintf("%02d", stateCode)
 
-	// Calculate the first check digit
+	// calculate the first check digit
 	checkDigit1, err := calculateCheckDigit1(sequenceNumberStr)
 	if err != nil {
 		return nil, fmt.Errorf("%s", translations.Get(lang, "invalid_check_digit_1"))
 	}
 
-	// Calculate the second check digit
+	// calculate the second check digit
 	checkDigit2, err := calculateCheckDigit2(stateCodeStr, checkDigit1, stateCode)
 	if err != nil {
 		return nil, fmt.Errorf("%s", translations.Get(lang, "invalid_check_digit_2"))
 	}
 
-	// Combine everything to form the complete number
+	// combine everything to form the complete number
 	number := sequenceNumberStr + stateCodeStr + checkDigit1 + checkDigit2
 	if number == "" || len(number) != 12 {
 		return nil, fmt.Errorf("%s", translations.Get(lang, "invalid_vote_registration"))