functions.php

<?php

define( 'SQUARECANDY_FAQ_PATH', plugin_dir_path( __FILE__ ) );
define( 'SQUARECANDY_FAQ_URL', plugin_dir_url( __FILE__ ) );
define( 'SQUARECANDY_FAQ_VERSION', 'version-5.0.0' );

// Square Candy Common files
require_once SQUARECANDY_FAQ_PATH . '/inc/sqcdy-common.php';
require_once SQUARECANDY_FAQ_PATH . '/inc/sqcdy-plugin.php';

// check if the page has accordions and needs to load the scripts and styles
add_action( 'wp', 'determine_is_faq' );
function determine_is_faq() {
	global $wp_query;
	$loadfaq = false; // set initial value
	// now let's go through each post in the query and see whether it needs the animations
	foreach ( $wp_query->posts as $eachpost ) {
		if ( ! isset( $eachpost->ID ) ) {
			continue;
		}
		$id                     = $eachpost->ID;
		$faq_checkbox           = get_post_meta( $id, 'make_faq_page', true ); // see whether the "make faq" check box was checked on this post
		$faq_shortcode_checkbox = get_post_meta( $id, 'make_faq_shortcode', true );
		if ( 'yes' === $faq_shortcode_checkbox || 'yes' === $faq_checkbox ) { // if this post needs the faq animations,
			$loadfaq = true;
		}
	}
	if ( $loadfaq ) {
		// if the current post, page, or one of the posts returned by the current query needs the animations....
		wp_enqueue_script( 'faqmaker', SQUARECANDY_FAQ_URL . 'dist/js/main.min.js', array( 'jquery' ), SQUARECANDY_FAQ_VERSION, true );
		wp_enqueue_style( 'faqstyle', SQUARECANDY_FAQ_URL . 'dist/css/main.min.css', array(), SQUARECANDY_FAQ_VERSION );
		add_filter( 'the_content', 'faq_filter', 1 );
	}
}

// filter to add accordions to the entire page
// add the .squarecandy_accordion_content_section div around the countent
function faq_filter( $content ) {
	//first, we need to check again whether the current page needs the animation, so that the animation is not given unnecessarily to posts on an archive / index page
	global $post;

	if ( ! isset( $post->ID ) ) {
		return;
	}

	$faq_checkbox           = get_post_meta( $post->ID, 'make_faq_page', true );
	$faq_shortcode_checkbox = get_post_meta( $post->ID, 'make_faq_shortcode', true );

	if ( 'yes' === $faq_checkbox && 'yes' !== $faq_shortcode_checkbox ) {
		//this code adds a script to call our javascript function with arguments set on the admin page
		$content  = '<div class="squarecandy_accordion_content_section">' . $content;
		$content .= '</div>';
	}
	return $content;
}

// Options Meta Box on the wp-admin edit page screen

add_action( 'do_meta_boxes', 'add_faq_check_boxes' );

function add_faq_check_boxes() {
	// by default this options box only shows on the Page post type.
	$faq_post_types = array( 'page' );
	// add filter to allow opening up more post types on a case-by-case basis
	$faq_post_types = apply_filters( 'squarecandy_filter_accordion_post_types', $faq_post_types );
	// this is set to only load on Pages - @TODO make an options screen to allow enabling on different types of posts.
	add_meta_box( 'faqcheck', 'Use Accordions on this Page', 'make_faq_check_box', $faq_post_types, 'side', 'low', 1 );
}

function make_faq_check_box( $post ) {
	if ( ! isset( $post->ID ) ) {
		return;
	}
	wp_nonce_field( 'faq_nonce_action', 'faq_nonce_name' );
	$faq_checked           = get_post_meta( $post->ID, 'make_faq_page', true );
	$checked               = ( 'yes' === $faq_checked ) ? 'checked="checked"' : '';
	$faq_shortcode_checked = get_post_meta( $post->ID, 'make_faq_shortcode', true );
	$checked_shortcode     = ( 'yes' === $faq_shortcode_checked ) ? 'checked="checked"' : '';
	?>
	<p>
		<input id="make_faq_page" name="make_faq_page" type="checkbox" value="yes" <?php echo $checked; // phpcs:ignore WordPress.Security.EscapeOutput ?>>
		<label for="make_faq_page"><strong>Full Page Accordion</strong></label><br>
		Check this box if you want to apply the accordion drop-down effect to the entire page.
	</p>
	<p>
		<input id="make_faq_shortcode" name="make_faq_shortcode" type="checkbox" value="yes" <?php echo $checked_shortcode; // phpcs:ignore WordPress.Security.EscapeOutput ?>>
		<label for="make_faq_shortcode"><strong>Shortcode Accordions</strong></label><br>
		Check this box to apply the drop-down effect only to sections on the page wrapped in the shortcodes
			<code>[accordion_start]</code> and <code>[accordion_end]</code>.
	</p>
	<?php
	// @TODO - add click to copy for the shortcodes, or click to insert into body
}

// Save the Checkbox Options

add_action( 'save_post', 'save_faq_check_box' );

function save_faq_check_box( $post_id ) {
	// by default this options box only shows on the Page post type.
	$faq_post_types = array( 'page' );
	// add filter to allow opening up more post types on a case-by-case basis
	$faq_post_types = apply_filters( 'squarecandy_filter_accordion_post_types', $faq_post_types );

	// lots of various situations to bail out early:
	if ( defined( 'DOING_AUTOSAVE' ) && DOING_AUTOSAVE ) {
		// this is an autosave and not a regular save button press
		return;
	}

	if ( function_exists( 'get_current_screen' ) ) :
		$screen = get_current_screen();
		if (
			is_object( $screen ) && (
				'' !== $screen->action || // check if this is the "add new" screen, or other actions which you don't want to process as a submission
				'post' !== $screen->base || // check that we are in the basic post edit screen
				! in_array( $screen->post_type, $faq_post_types, true ) // check that the type of post we are editing is one of the allowed types
			)
		) {
			return;
		}
	endif;

	// verify this came from the our screen and with proper authorization,
	// because save_post can be triggered at other times
	if ( ! isset( $_POST['faq_nonce_name'] ) || ! wp_verify_nonce( $_POST['faq_nonce_name'], 'faq_nonce_action' ) ) {
		return;
	}

	// Check permissions
	if ( isset( $_POST['post_type'] ) && 'page' === $_POST['post_type'] ) {
		if ( ! current_user_can( 'edit_page', $post_id ) ) {
			return;
		}
	} else {
		if ( ! current_user_can( 'edit_post', $post_id ) ) {
			return;
		}
	}

	// OK, we're authenticated: we need to find and save the data
	$faq = ( ! empty( $_POST['make_faq_page'] ) ) ? $_POST['make_faq_page'] : '';
	update_post_meta( $post_id, 'make_faq_page', $faq );

	$faq_shortcode = ( ! empty( $_POST['make_faq_shortcode'] ) ) ? $_POST['make_faq_shortcode'] : '';
	update_post_meta( $post_id, 'make_faq_shortcode', $faq_shortcode );
}

add_shortcode( 'accordion_start', 'squarecandy_accordion_shortcode_start' );
add_shortcode( 'accordion_end', 'squarecandy_accordion_shortcode_end' );

function squarecandy_accordion_shortcode_start() {
	if ( 'yes' === get_post_meta( get_the_ID(), 'make_faq_shortcode', true ) ) {
		return '<div class="squarecandy_accordion_content_section">';
	}
}

function squarecandy_accordion_shortcode_end() {
	if ( 'yes' === get_post_meta( get_the_ID(), 'make_faq_shortcode', true ) ) {
		return '</div>';
	}
}

// squarecandy common
require SQUARECANDY_FAQ_PATH . 'inc/sqcdy-common.php';
require SQUARECANDY_FAQ_PATH . 'inc/sqcdy-plugin.php';