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package com.spice.profitmandi.service.whatsapp;
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/**
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 * Recipient-number handling for the WhatsApp gateway.
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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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}