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package com.spice.profitmandi.service.whatsapp;
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/**
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* Recipient-number handling shared by the WhatsApp providers.
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*
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* <p>Lives here rather than in a general string utility because "prefix 91" is an India-MSISDN rule
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* that only holds for this integration.</p>
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*/
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public final class WhatsappNumbers {
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private WhatsappNumbers() {
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}
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/**
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* Normalises a recipient to a bare MSISDN: strips everything non-numeric, prefixes {@code 91} when
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* exactly ten digits remain, and passes longer numbers (already country-coded) through. Returns
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* {@code null} when nothing usable is left, which callers treat as "do not send".
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*/
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public static String toMsisdn(String mobile) {
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if (mobile == null) {
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return null;
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}
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String digits = mobile.replaceAll("[^0-9]", "");
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if (digits.isEmpty()) {
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return null;
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}
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if (digits.length() == 10) {
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return "91" + digits;
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}
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return digits;
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}
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/**
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* The legacy Gupshup admission check: the raw string must be exactly ten characters, with no
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* cleanup first. Deliberately stricter than {@link #toMsisdn} — Gupshup has been dropping numbers
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* that fail this for years, and loosening it during a refactor would start delivering a backlog of
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* messages that were never meant to go out in one burst. Only Gupshup should use this.
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*/
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public static boolean isTenDigit(String mobile) {
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return mobile != null && mobile.length() == 10;
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}
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}
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