<?php
/**
 * Main plugin container.
 *
 * @package BoringQuote
 */

namespace BoringQuote;

defined( 'ABSPATH' ) || exit;

/**
 * Class Plugin
 */
class Plugin {

	/**
	 * Singleton instance.
	 *
	 * @var Plugin|null
	 */
	protected static $instance = null;

	/**
	 * Guest/user session handler.
	 *
	 * @var Session
	 */
	public $session;

	/**
	 * Quote list operations.
	 *
	 * @var QuoteList
	 */
	public $list;

	/**
	 * Frontend handler (null in admin).
	 *
	 * @var Frontend|null
	 */
	public $frontend = null;

	/**
	 * Get the single instance.
	 *
	 * @return Plugin
	 */
	public static function instance() {
		if ( is_null( self::$instance ) ) {
			self::$instance = new self();
		}
		return self::$instance;
	}

	/**
	 * Wire everything up.
	 */
	private function __construct() {
		$this->session = new Session();
		$this->list    = new QuoteList( $this->session );

		new QuoteCPT();
		new Shortcodes( $this->list );
		new RestController( $this->list );
		new SubmitHandler( $this->list );
		new Privacy();
		new Blocks();

		if ( is_admin() ) {
			new Admin();
			new GettingStarted();
		}
		// is_admin() is also true in admin-ajax.php, where themes render products (filters, quick view).
		if ( ! is_admin() || wp_doing_ajax() ) {
			$this->frontend = new Frontend( $this->list );
		}

		add_filter( 'woocommerce_email_classes', array( $this, 'register_emails' ) );
		add_action( 'bbquote_cleanup_sessions', array( Session::class, 'cleanup' ) );
	}

	/**
	 * Register plugin emails within the WooCommerce mailer.
	 *
	 * @param array $emails Registered WC emails.
	 * @return array
	 */
	public function register_emails( $emails ) {
		$emails['BBQUOTE_Email_New_Request']      = new Emails\NewRequestEmail();
		$emails['BBQUOTE_Email_Customer_Confirm'] = new Emails\CustomerConfirmEmail();
		return $emails;
	}

	/**
	 * CSS classes for front-end buttons. Block themes style `wp-element-button`, classic themes `.button`.
	 *
	 * @param string $extra Extra classes.
	 * @return string
	 */
	public static function button_class( $extra = '' ) {
		return trim( 'button ' . $extra . ' ' . wc_wp_theme_get_element_class_name( 'button' ) );
	}

	/**
	 * URL of the quote request page.
	 *
	 * @return string
	 */
	public static function get_page_url() {
		$page_id = self::get_page_id();
		// get_permalink( 0 ) would return the CURRENT post's URL - guard against a missing page.
		$url = $page_id ? (string) get_permalink( $page_id ) : '';
		return apply_filters( 'bbquote_page_url', $url );
	}

	/**
	 * ID of the quote request page.
	 *
	 * @return int
	 */
	public static function get_page_id() {
		return (int) apply_filters( 'wpml_object_id', get_option( 'bbquote_page_id' ), 'post', true ); // phpcs:ignore WordPress.NamingConventions.PrefixAllGlobals.NonPrefixedHooknameFound -- WooCommerce/WPML hook.
	}

	/**
	 * Read one setting with default.
	 *
	 * @param string $key     Setting key.
	 * @param mixed  $fallback Default value.
	 * @return mixed
	 */
	public static function setting( $key, $fallback = '' ) {
		$settings = (array) get_option( 'bbquote_settings', array() );
		return array_key_exists( $key, $settings ) ? $settings[ $key ] : $fallback;
	}
}