69 lines
1.8 KiB
Dart
69 lines
1.8 KiB
Dart
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String formatPhoneForDisplay(String? rawPhone) {
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final normalized = _normalizePhone(rawPhone);
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if (normalized == null) {
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return rawPhone?.trim() ?? '';
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}
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if (normalized.startsWith('+86') && normalized.length == 14) {
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final local = normalized.substring(3);
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return '${local.substring(0, 3)}****${local.substring(7)}';
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}
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if (!normalized.startsWith('+')) {
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return normalized;
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}
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final digits = normalized.substring(1);
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final countryCode = _detectCountryCode(digits);
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if (countryCode == null) {
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return normalized;
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}
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final localNumber = digits.substring(countryCode.length);
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if (localNumber.length <= 4) {
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return '+$countryCode $localNumber';
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}
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final tail = localNumber.substring(localNumber.length - 4);
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return '+$countryCode ****$tail';
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}
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String? _normalizePhone(String? rawPhone) {
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if (rawPhone == null) {
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return null;
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}
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var phone = rawPhone.trim();
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for (final separator in const [' ', '-', '(', ')']) {
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phone = phone.replaceAll(separator, '');
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}
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if (phone.isEmpty) {
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return null;
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}
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if (phone.startsWith('00') && phone.length > 2) {
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phone = '+${phone.substring(2)}';
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}
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if (!phone.startsWith('+') && RegExp(r'^\d+$').hasMatch(phone)) {
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phone = '+$phone';
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}
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return phone;
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}
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String? _detectCountryCode(String digits) {
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const knownCodes = ['86', '1', '44', '81', '65', '33'];
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for (final code in knownCodes) {
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if (digits.startsWith(code) && digits.length > code.length + 3) {
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return code;
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}
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}
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for (int length = 3; length >= 1; length--) {
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if (length >= digits.length) {
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continue;
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}
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final candidate = digits.substring(0, length);
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if (candidate.startsWith('0')) {
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continue;
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}
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if (digits.length - length >= 4) {
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return candidate;
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}
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}
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return null;
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}
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