<?php
/**
 * Front end: adds the FlatRateChat widget script to every public page once the site is connected.
 *
 * @package FlatRateChat
 */

defined( 'ABSPATH' ) || exit;

/**
 * Enqueues the widget loader.
 */
class FlatRateChat_Frontend {

	const HANDLE = 'flatratechat-widget';

	/**
	 * Hook up.
	 */
	public static function init() {
		add_action( 'wp_enqueue_scripts', array( __CLASS__, 'enqueue' ) );
		add_filter( 'script_loader_tag', array( __CLASS__, 'tag' ), 10, 2 );
	}

	/**
	 * Enqueue the loader in the footer. Nothing is added while the site is not connected.
	 */
	public static function enqueue() {
		$key = FlatRateChat_Service::site_key();
		if ( '' === $key || is_admin() || is_feed() || is_embed() ) {
			return;
		}
		/**
		 * Filter: hide the chat bubble on a given request.
		 *
		 * @param bool $show Whether to load the widget (default true).
		 */
		if ( ! apply_filters( 'flatratechat_show_widget', true ) ) {
			return;
		}
		// WordPress 6.3+ honours the async strategy; older versions treat the array as "in footer" and the tag filter adds async.
		wp_enqueue_script(
			self::HANDLE,
			FlatRateChat_Service::base_url() . '/w.js',
			array(),
			FLATRATECHAT_VERSION,
			array(
				'in_footer' => true,
				'strategy'  => 'async',
			)
		);
	}

	/**
	 * The loader reads the site key from its own data-site attribute.
	 *
	 * @param string $tag    Script tag.
	 * @param string $handle Script handle.
	 * @return string
	 */
	public static function tag( $tag, $handle ) {
		if ( self::HANDLE !== $handle ) {
			return $tag;
		}
		$key = FlatRateChat_Service::site_key();
		if ( '' === $key || false !== strpos( $tag, 'data-site=' ) ) {
			return $tag;
		}
		$attrs = ' data-site="' . esc_attr( $key ) . '"';
		if ( false === strpos( $tag, ' async' ) ) {
			$attrs .= ' async';
		}
		return str_replace( '<script ', '<script' . $attrs . ' ', $tag );
	}
}