order validation

orders/phone_validation.go

@@ -0,0 +1,57 @@
+package orders
+
+import (
+	"fmt"
+	"regexp"
+	"strings"
+)
+
+func isValidPolishMobile(nineDigitNum string) bool {
+	if len(nineDigitNum) != 9 {
+		return false
+	}
+
+	firstDigit := nineDigitNum[0]
+
+	if firstDigit < '4' || firstDigit > '8' {
+		return false
+	}
+
+	prefix2 := nineDigitNum[:2]
+	validPrefixes := map[string]bool{
+		"45": true,
+		"50": true, "51": true, "53": true, "57": true,
+		"60": true, "66": true, "69": true,
+		"72": true, "73": true, "78": true, "79": true,
+		"88": true,
+	}
+
+	return validPrefixes[prefix2]
+}
+
+func parseAndValidatePolishMobile(input string) (string, error) {
+	input = strings.TrimSpace(input)
+
+	if strings.HasPrefix(input, "+48") {
+		input = strings.TrimPrefix(input, "+48")
+	} else if strings.HasPrefix(input, "0048") {
+		input = strings.TrimPrefix(input, "0048")
+	}
+
+	re := regexp.MustCompile(`\D`)
+	cleaned := re.ReplaceAllString(input, "")
+
+	if len(cleaned) == 11 && strings.HasPrefix(cleaned, "48") {
+		cleaned = cleaned[2:]
+	}
+
+	if len(cleaned) != 9 {
+		return "", fmt.Errorf("invalid length: expected 9 digits, got %d", len(cleaned))
+	}
+
+	if !isValidPolishMobile(cleaned) {
+		return "", fmt.Errorf("invalid mobile prefix: %s does not match Polish mobile allocations", cleaned[:2])
+	}
+
+	return cleaned, nil
+}