<?php

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

function x_pixel_hash_value( $value ) {
	$value = strtolower( trim( (string) $value ) );
	if ( $value === '' ) {
		return '';
	}
	return hash( 'sha256', $value );
}

function x_pixel_normalize_phone( $phone, $calling_code = '' ) {
	$phone         = trim( (string) $phone );
	$digits        = preg_replace( '/\D+/', '', $phone );
	$international = $phone !== '' && $phone[0] === '+';
	if ( ! $international && strpos( $digits, '00' ) === 0 ) {
		$international = true;
		$digits        = substr( $digits, 2 );
	}
	if ( ! $international ) {
		$code = preg_replace( '/\D+/', '', (string) $calling_code );
		if ( $code === '' ) {
			return '';
		}
		if ( strpos( $digits, $code ) !== 0 || strlen( $digits ) <= 10 ) {
			$digits = $code . ltrim( $digits, '0' );
		}
	}
	if ( ! preg_match( '/^\d{7,15}$/', $digits ) ) {
		return '';
	}
	return '+' . $digits;
}

function x_pixel_matching_params( $email, $phone, $first_name, $last_name, $calling_code = '' ) {
	$params = array();
	$hashed = x_pixel_hash_value( is_email( $email ) ? $email : '' );
	if ( $hashed !== '' ) {
		$params['email_address'] = $hashed;
	}
	$hashed = x_pixel_hash_value( x_pixel_normalize_phone( $phone, $calling_code ) );
	if ( $hashed !== '' ) {
		$params['phone_number'] = $hashed;
	}
	$hashed = x_pixel_hash_value( $first_name );
	if ( $hashed !== '' ) {
		$params['first_name'] = $hashed;
	}
	$hashed = x_pixel_hash_value( $last_name );
	if ( $hashed !== '' ) {
		$params['last_name'] = $hashed;
	}
	return $params;
}

function x_pixel_matching_identifiers( $identifiers, $params ) {
	if ( ! empty( $params['email_address'] ) ) {
		$identifiers['hashed_email'] = $params['email_address'];
	}
	if ( ! empty( $params['phone_number'] ) ) {
		$identifiers['hashed_phone_number'] = $params['phone_number'];
	}
	return $identifiers;
}

function x_pixel_content_item( $id, $name, $price, $quantity, $group_id ) {
	$item = array(
		'content_type' => 'product',
		'content_id'   => (string) $id,
		'content_name' => (string) $name,
	);
	if ( $price !== null && $price !== '' ) {
		$item['content_price'] = (float) $price;
	}
	$item['num_items'] = max( 1, (int) $quantity );
	if ( $group_id !== null && (string) $group_id !== '' ) {
		$item['content_group_id'] = (string) $group_id;
	}
	return $item;
}

function x_pixel_send_capi( $event_id, $params, $identifiers, $conversion_id, $source_url ) {
	$pixel_id = x_pixel_get_id();
	$token    = get_option( X_PIXEL_OPTION_CAPI, '' );
	$code     = x_pixel_event_code( $pixel_id, $event_id );
	if ( $pixel_id === '' || $token === '' || $code === '' ) {
		return false;
	}

	$clean_ids = array();
	foreach ( $identifiers as $key => $value ) {
		if ( is_string( $value ) && $value !== '' ) {
			$clean_ids[ $key ] = $value;
		}
	}
	if ( $clean_ids === array() ) {
		return false;
	}

	$body = array(
		'conversions' => array(
			array(
				'conversion_time'  => gmdate( 'Y-m-d\TH:i:s.000\Z' ),
				'event_id'         => $code,
				'event_source_url' => $source_url,
				'conversion_id'    => $conversion_id,
				'identifiers'      => array( $clean_ids ),
			),
		),
	);

	if ( isset( $params['value'] ) ) {
		$body['conversions'][0]['value'] = (float) $params['value'];
	}
	if ( ! empty( $params['currency'] ) ) {
		$body['conversions'][0]['price_currency'] = strtoupper( (string) $params['currency'] );
	}
	if ( isset( $params['num_items'] ) ) {
		$body['conversions'][0]['number_items'] = (int) $params['num_items'];
	}
	if ( ! empty( $params['contents'] ) && is_array( $params['contents'] ) ) {
		$body['conversions'][0]['contents'] = $params['contents'];
	}
	if ( ! empty( $params['description'] ) ) {
		$body['conversions'][0]['description'] = (string) $params['description'];
	}
	if ( ! empty( $params['search_string'] ) ) {
		$body['conversions'][0]['search_string'] = (string) $params['search_string'];
	}

	$response = wp_remote_post(
		'https://ads-api.x.com/12/measurement/conversions/' . rawurlencode( $pixel_id ),
		array(
			'timeout'  => 5,
			'blocking' => false,
			'headers'  => array(
				'Content-Type'  => 'application/json',
				'X-Pixel-Token' => $token,
			),
			'body'     => wp_json_encode( $body, JSON_PRESERVE_ZERO_FRACTION ),
		)
	);
	return ! is_wp_error( $response );
}