<?php
/**
 * Core plugin functionality.
 *
 * @package AdRefreshControl
 */

namespace AdRefreshControl\Core;

use \WP_Error as WP_Error;

/**
 * Default setup routine
 *
 * @return void
 */
function setup() {

	add_action( 'init', __NAMESPACE__ . '\i18n' );
	add_action( 'init', __NAMESPACE__ . '\init' );
	add_action( 'wp_enqueue_scripts', __NAMESPACE__ . '\scripts' );

	// Hook to allow async or defer on asset loading.
	add_filter( 'script_loader_tag', __NAMESPACE__ . '\script_loader_tag', 10, 2 );

	do_action( 'avc_loaded' );
}

/**
 * Registers the default textdomain.
 *
 * @return void
 */
function i18n() {
	$locale = apply_filters( 'plugin_locale', get_locale(), 'ad-refresh-control' );
	load_textdomain( 'ad-refresh-control', WP_LANG_DIR . '/ad-refresh-control/ad-refresh-control-' . $locale . '.mo' );
	load_plugin_textdomain( 'ad-refresh-control', false, plugin_basename( AD_REFRESH_CONTROL_PATH ) . '/languages/' );
}

/**
 * Initializes the plugin and fires an action other plugins can hook into.
 *
 * @return void
 */
function init() {
	do_action( 'avc_init' );
}

/**
 * Activate the plugin
 *
 * @return void
 */
function activate() {
	// First load the init scripts in case any rewrite functionality is being loaded
	init();
}

/**
 * Deactivate the plugin
 *
 * Uninstall routines should be in uninstall.php
 *
 * @return void
 */
function deactivate() {

}

/**
 * Generate an URL to a script, taking into account whether SCRIPT_DEBUG is enabled.
 *
 * @param string $script Script file name (no .js extension)
 *
 * @return string|WP_Error URL
 */
function script_url( $script ) {
	return AD_REFRESH_CONTROL_URL . "dist/js/{$script}.js";
}

/**
 * Enqueue scripts for front-end.
 *
 * @return void
 */
function scripts() {

	$avc_settings         = get_option( 'avc_settings' );
	$disable_refresh      = apply_filters(
		'avc_disable_refresh',
		$avc_settings['disable_refresh'] ?? false
	);
	$advertiser_ids       = apply_filters(
		'avc_advertiser_ids',
		$avc_settings['advertiser_ids'] ?? []
	);
	$advertiser_ids_assoc = [];
	foreach ( $advertiser_ids as $advertiser_id ) {
		$advertiser_ids_assoc[ $advertiser_id ] = 1;
	}

	$line_item_ids       = apply_filters(
		'avc_line_item_ids',
		$avc_settings['line_item_ids'] ?? []
	);
	$line_item_ids_assoc = [];
	foreach ( $line_item_ids as $line_item_id ) {
		$line_item_ids_assoc[ $line_item_id ] = 1;
	}

	$sizes_to_exclude = apply_filters(
		'avc_sizes_to_exclude',
		$avc_settings['sizes_to_exclude'] ?? ''
	);

	if ( ! empty( $sizes_to_exclude ) ) {
		$sizes_to_exclude = explode( ',', $sizes_to_exclude );

		$sizes_to_exclude = array_map(
			function ( $size ) {
				return trim( str_replace( 'x', ',', $size ) );
			},
			$sizes_to_exclude
		);
	}

	$slot_ids_to_exclude       = apply_filters(
		'avc_slot_ids_to_exclude',
		$avc_settings['slot_ids_to_exclude'] ?? []
	);
	$slot_ids_to_exclude_assoc = [];
	foreach ( $slot_ids_to_exclude as $slot_id ) {
		$slot_ids_to_exclude_assoc[ trim( $slot_id ) ] = 1;
	}

	$viewability_threshold = $avc_settings['viewability_threshold'] ?? 70;
	$refresh_interval      = $avc_settings['refresh_interval'] ?? 30;
	/**
	 * Refresh interval.
	 *
	 * Allows developers to filter the default refresh interval value of 30 seconds.
	 * We strongly advise developers to not filter this to a value less than 30 seconds.
	 * Filterable via the avc_refresh_interval_value filter hook.
	 *
	 * @since 1.0.5
	 * @link  https://github.com/10up/Ad-Refresh-Control/issues/46
	 *
	 * @param int $refresh_interval The refresh interval in seconds. Defaults to 30.
	 */
	$refresh_interval  = absint( apply_filters( 'avc_refresh_interval_value', $refresh_interval ) );
	$maximum_refreshes = $avc_settings['maximum_refreshes'] ?? 10;

	if ( $disable_refresh ) {
		// No need to enqueue scripts if no refreshing will occur.
		return;
	}

	wp_enqueue_script(
		'avc_frontend',
		script_url( 'frontend', 'frontend' ),
		[],
		AD_REFRESH_CONTROL_VERSION,
		true
	);

	wp_localize_script(
		'avc_frontend',
		'AdRefreshControl',
		[
			'advertiserIds'        => $advertiser_ids_assoc,
			'lineItemIds'          => $line_item_ids_assoc,
			'sizesToExclude'       => $sizes_to_exclude,
			'slotIdsToExclude'     => $slot_ids_to_exclude_assoc,
			'viewabilityThreshold' => apply_filters( 'avc_viewability_threshold', $viewability_threshold ),
			'refreshInterval'      => apply_filters( 'avc_refresh_interval', $refresh_interval ),
			'maximumRefreshes'     => apply_filters( 'avc_maximum_refreshes', $maximum_refreshes ),
			'refreshCallback'      => apply_filters( 'avc_refresh_callback', false ),
		]
	);
}

/**
 * Add async/defer attributes to enqueued scripts that have the specified script_execution flag.
 *
 * @link https://core.trac.wordpress.org/ticket/12009
 * @param string $tag    The script tag.
 * @param string $handle The script handle.
 * @return string
 */
function script_loader_tag( $tag, $handle ) {
	$script_execution = wp_scripts()->get_data( $handle, 'script_execution' );

	if ( ! $script_execution ) {
		return $tag;
	}

	if ( 'async' !== $script_execution && 'defer' !== $script_execution ) {
		return $tag; // _doing_it_wrong()?
	}

	// Abort adding async/defer for scripts that have this script as a dependency. _doing_it_wrong()?
	foreach ( wp_scripts()->registered as $script ) {
		if ( in_array( $handle, $script->deps, true ) ) {
			return $tag;
		}
	}

	// Add the attribute if it hasn't already been added.
	if ( ! preg_match( ":\s$script_execution(=|>|\s):", $tag ) ) {
		$tag = preg_replace( ':(?=></script>):', " $script_execution", $tag, 1 );
	}

	return $tag;
}