<?php
/** Local metadata-backed parsing for explicitly selected phone countries. */

namespace Abientot\Support;

use Abientot\ThirdParty\PhoneNumber\Lib\PhoneNumberFormat;
use Abientot\ThirdParty\PhoneNumber\Lib\PhoneNumberUtil;

if ( ! defined( 'ABSPATH' ) ) {
	exit;
}

final class Phone {
	private static function util(): PhoneNumberUtil {
		require_once dirname( __DIR__ ) . '/ThirdParty/PhoneNumber/bootstrap.php';
		return PhoneNumberUtil::getInstance();
	}

	/** ISO 3166 region => country calling code, including shared calling codes. */
	public static function regions(): array {
		static $regions = null;
		if ( $regions === null ) {
			$regions = array();
			$util    = self::util();
			foreach ( $util->getSupportedRegions() as $region ) {
				$regions[ $region ] = $util->getCountryCodeForRegion( $region );
			}
			ksort( $regions );
		}
		return $regions;
	}

	/** New numbers only: never infer a national region from language or location. */
	public static function normalize( string $raw, string $region = '' ): string {
		$region = strtoupper( trim( $region ) );
		if ( strlen( $raw ) > 256 || ( $region !== '' && ! isset( self::regions()[ $region ] ) ) ) {
			throw new \DomainException( 'phone_invalid' );
		}
		// Reject controls, invisible format marks (including bidi), and invalid UTF-8.
		if ( ! preg_match( '//u', $raw ) || preg_match( '/[\p{Cc}\p{Cf}]/u', $raw ) ) {
			throw new \DomainException( 'phone_invalid' );
		}
		if ( class_exists( '\\IntlChar' ) ) {
			$raw = preg_replace_callback(
				'/\p{Nd}/u',
				static function ( $match ) {
					$digit = \IntlChar::digit( $match[0] );
					return is_int( $digit ) && $digit >= 0 && $digit <= 9 ? (string) $digit : $match[0];
				},
				$raw
			);
		}
				$map = array( '＋' => '+' );
		foreach ( array( '０１２３４５６７８９', '٠١٢٣٤٥٦٧٨٩', '۰۱۲۳۴۵۶۷۸۹', '०१२३४५६७८९' ) as $alphabet ) {
			foreach ( preg_split( '//u', $alphabet, -1, PREG_SPLIT_NO_EMPTY ) as $digit => $character ) {
				$map[ $character ] = (string) $digit;
			}
		}
		$number = strtr( $raw, $map );
		$number = preg_replace( '/\p{Zs}/u', ' ', $number );
		$number = trim( $number );
		// A full-string grammar prevents the parser extracting a number from text,
		// accepting vanity letters, silently dropping extensions or injection text.
		if ( ! preg_match( '/^\+?[0-9 ().-]+$/D', $number ) || ( $region === '' && $number[0] !== '+' ) ) {
			throw new \DomainException( 'phone_invalid' );
		}
		try {
			$util   = self::util();
			$parsed = $util->parse( $number, $region === '' ? null : $region );
			if ( $parsed->hasExtension() || ! $util->isValidNumber( $parsed ) ) {
				throw new \DomainException( 'phone_invalid' );
			}
			return $util->format( $parsed, PhoneNumberFormat::E164 );
		} catch ( \Exception $error ) {
			throw new \DomainException( 'phone_invalid' );
		}
	}

	/** Friendly international display; preserve unparseable historical values. */
	public static function format( string $raw ): string {
		try {
			$canonical = self::normalize( $raw );
			$util      = self::util();
			return $util->format( $util->parse( $canonical, null ), PhoneNumberFormat::INTERNATIONAL );
		} catch ( \DomainException $error ) {
			return $raw;
		}
	}
}