<?php
/**
 * The front end: one async script tag, once a site key is saved.
 *
 * The loader finds its own tag through `currentScript`, falling back to a
 * `/p.js` script carrying `?site=` or `data-site` (packages/loader in the
 * Pupop repo). The tag carries both, so the key survives an optimiser that
 * strips query strings or one that drops attributes.
 *
 * @package Pupop
 */

// Exit if accessed directly.
if ( ! defined( 'ABSPATH' ) ) {
	exit;
}

/**
 * Enqueues p.js. wp_enqueue_scripts only runs on the front end, so admin
 * screens never load it. A null version keeps `?ver=` off the src.
 */
function pupop_enqueue_script() {
	$key = pupop_site_key();
	if ( '' === $key ) {
		return;
	}
	wp_enqueue_script(
		'pupop',
		add_query_arg( 'site', $key, PUPOP_EDGE_URL . '/p.js' ),
		array(),
		null, // phpcs:ignore WordPress.WP.EnqueuedResourceParameters.MissingVersion -- p.js is versioned by the edge, and a ?ver= would split its cache.
		array( 'strategy' => 'async' )
	);
}
add_action( 'wp_enqueue_scripts', 'pupop_enqueue_script' );

/**
 * Adds `data-site` and the optimiser opt-outs to the tag. Delaying or
 * deferring the script until the visitor interacts would break time-delay
 * triggers. Uses script_loader_tag, not wp_script_attributes, because core
 * only builds script tags through wp_get_script_tag from 6.4.
 *
 * @param string $tag    The script tag.
 * @param string $handle The script handle.
 * @return string
 */
function pupop_script_tag( $tag, $handle ) {
	if ( 'pupop' !== $handle ) {
		return $tag;
	}
	$attributes = sprintf(
		'<script data-site="%s" data-no-optimize="1" data-no-defer="1" data-cfasync="false" nowprocket',
		esc_attr( pupop_site_key() )
	);
	return preg_replace( '/<script\b/', $attributes, $tag, 1 );
}
add_filter( 'script_loader_tag', 'pupop_script_tag', 10, 2 );

/**
 * Keeps p.js out of WP Rocket's "Delay JavaScript execution".
 *
 * @param string[] $exclusions Patterns WP Rocket leaves alone.
 * @return string[]
 */
function pupop_rocket_delay_js_exclusions( $exclusions ) {
	$exclusions   = is_array( $exclusions ) ? $exclusions : array();
	$exclusions[] = wp_parse_url( PUPOP_EDGE_URL, PHP_URL_HOST ) . '/p.js';
	return $exclusions;
}
add_filter( 'rocket_delay_js_exclusions', 'pupop_rocket_delay_js_exclusions' );