<?php
if ( ! defined( 'ABSPATH' ) ) exit;

/**
 * PXSYNC_GDPR_Hash: Standardizes user data for TikTok compliance.
 * Never forget comments: PII data must be normalized (lowercase/trimmed) 
 * and hashed with SHA256 before being sent to TikTok.
 */
class PXSYNC_GDPR_Hash {

    public static function hash( $value ) {
        if ( empty( $value ) ) return '';
        return hash( 'sha256', strtolower( trim( (string) $value ) ) );
    }


    /** Valid, lowercase SHA-256 email hash, or '' when the email is empty/invalid. */
    public static function hash_email( $email ) {
        $email = strtolower( trim( (string) $email ) );
        if ( $email === '' || ! is_email( $email ) ) return '';
        return self::hash( $email );
    }


     /**
     * Formats phone numbers to strict E.164 standard.
     * Logic migrated from the original PXSYNC_Tracker.
     */
    public static function format_phone_e164( $phone, $country_code = '' ) {
        if ( empty( $phone ) ) return '';

        // 1. Remove all non-digits
        $phone = preg_replace('/\D/', '', $phone);
        
        // 2. Get dial code (using the helper method from Tracker)
        $dial = PXSYNC_Tracker::get_instance()->tiktok_get_dial_code($country_code);

        // 3. Apply the '0' prefix and dial code logic
        if (strpos($phone, '0') === 0) {
            $phone = $dial . substr($phone, 1);
        }

        if (strpos($phone, $dial) !== 0) {
            $phone = $dial . $phone;
        }

        return  '+' . $phone;
    }

    /**
     * Formats phone numbers to strict E.164 standard.
     * Logic migrated from the original PXSYNC_Tracker.
     */
    public static function format_and_hash_phone( $phone, $country_code = '' ) {
        if ( empty( $phone ) ) return '';

        // 1. Remove all non-digits
        $phone = preg_replace('/\D/', '', $phone);
        
        // 2. Get dial code (using the helper method from Tracker)
        $dial = PXSYNC_Tracker::get_instance()->tiktok_get_dial_code($country_code);

        // 3. Apply the '0' prefix and dial code logic
        if (strpos($phone, '0') === 0) {
            $phone = $dial . substr($phone, 1);
        }

        if (strpos($phone, $dial) !== 0) {
            $phone = $dial . $phone;
        }

        return self::hash( '+' . $phone );
    }
}