<?php
/**
 * Plugin container.
 *
 * Owns the settings, the registries (guards, sinks, block types, templates) and
 * boots every module. Free registers its own modules through the same
 * `dango_cof_modules` filter that Pro uses, so nothing in core knows about Pro.
 *
 * @package DangoCODOrderForm
 */

defined( 'ABSPATH' ) || exit;

/**
 * Main plugin class.
 */
final class Dango_COF_Plugin {

	/**
	 * Singleton.
	 *
	 * @var Dango_COF_Plugin|null
	 */
	private static $instance = null;

	/**
	 * Settings service.
	 *
	 * @var Dango_COF_Settings
	 */
	public $settings;

	/**
	 * Registered guards keyed by id.
	 *
	 * @var Dango_COF_Guard[]
	 */
	private $guards = array();

	/**
	 * Registered sinks keyed by id.
	 *
	 * @var Dango_COF_Sink[]
	 */
	private $sinks = array();

	/**
	 * Booted modules keyed by id.
	 *
	 * @var Dango_COF_Module[]
	 */
	private $modules = array();

	/**
	 * Get (and on first call, boot) the plugin.
	 *
	 * @return Dango_COF_Plugin
	 */
	public static function instance() {
		if ( null === self::$instance ) {
			self::$instance = new self();
			self::$instance->boot();
		}
		return self::$instance;
	}

	/**
	 * Boot services and modules.
	 */
	private function boot() {
		if ( ! class_exists( 'WooCommerce' ) ) {
			add_action( 'admin_notices', array( $this, 'notice_woocommerce_missing' ) );
			return;
		}

		$this->settings = new Dango_COF_Settings();

		Dango_COF_Installer::maybe_upgrade();
		Dango_COF_Order_Query::init();
		Dango_COF_Forms::init();
		Dango_COF_Events::init( $this );
		Dango_COF_Stats::init();
		Dango_COF_Tax::init();
		Dango_COF_Terms::init();
		Dango_COF_Privacy::init( $this );
		Dango_COF_Rest::init( $this );
		Dango_COF_Frontend::init( $this );
		Dango_COF_TrackKaro::init( $this );
		Dango_COF_Compat::init();
		Dango_COF_Elementor::init();
		Dango_COF_Cli::init();

		$this->register_core_guards();

		if ( is_admin() ) {
			Dango_COF_Admin::init( $this );
			Dango_COF_Admin_Orders::init( $this );
			Dango_COF_Admin_Products::init( $this );
		}

		$this->boot_modules();

		/**
		 * Fires after the plugin and all modules are booted.
		 *
		 * @param Dango_COF_Plugin $plugin Plugin container.
		 */
		do_action( 'dango_cof_loaded', $this );
	}

	/**
	 * Free's own guards. Pro adds more through add_guard().
	 */
	private function register_core_guards() {
		$this->add_guard( new Dango_COF_Guard_Honeypot( $this ) );
		$this->add_guard( new Dango_COF_Guard_Time_Trap( $this ) );
		$this->add_guard( new Dango_COF_Guard_Blocklist( $this ) );
		$this->add_guard( new Dango_COF_Guard_Limits( $this ) );
		$this->add_guard( new Dango_COF_Guard_Duplicate( $this ) );
		$this->add_guard( new Dango_COF_Guard_Turnstile( $this ) );
	}

	/**
	 * Collect and boot modules.
	 */
	private function boot_modules() {
		$modules = array(
			new Dango_COF_Module_Pixels(),
			new Dango_COF_Module_Advance(),
		);

		/**
		 * Modules to boot. Pro appends its modules here.
		 *
		 * @param Dango_COF_Module[] $modules Module instances.
		 * @param Dango_COF_Plugin   $plugin  Plugin container.
		 */
		$modules = (array) apply_filters( 'dango_cof_modules', $modules, $this );

		foreach ( $modules as $module ) {
			if ( ! $module instanceof Dango_COF_Module ) {
				continue;
			}
			try {
				$module->boot( $this );
				$this->modules[ $module->id() ] = $module;
			} catch ( \Throwable $e ) {
				Dango_COF_Log::error( 'Module ' . $module->id() . ' failed to boot: ' . $e->getMessage() );
			}
		}
	}

	/**
	 * Is a module booted?
	 *
	 * @param string $id Module id.
	 * @return bool
	 */
	public function has_module( $id ) {
		return isset( $this->modules[ $id ] );
	}

	/**
	 * Register a guard.
	 *
	 * @param Dango_COF_Guard $guard Guard.
	 */
	public function add_guard( Dango_COF_Guard $guard ) {
		$this->guards[ $guard->id() ] = $guard;
	}

	/**
	 * Guards sorted by priority.
	 *
	 * @return Dango_COF_Guard[]
	 */
	public function guards() {
		$guards = (array) apply_filters( 'dango_cof_guards', $this->guards, $this );
		uasort(
			$guards,
			static function ( $a, $b ) {
				return $a->priority() <=> $b->priority();
			}
		);
		return $guards;
	}

	/**
	 * Register a sink.
	 *
	 * @param Dango_COF_Sink $sink Sink.
	 */
	public function add_sink( Dango_COF_Sink $sink ) {
		$this->sinks[ $sink->id() ] = $sink;
	}

	/**
	 * Registered sinks.
	 *
	 * @return Dango_COF_Sink[]
	 */
	public function sinks() {
		return (array) apply_filters( 'dango_cof_sinks', $this->sinks, $this );
	}

	/**
	 * Is the Pro add-on active and licensed?
	 *
	 * @return bool
	 */
	public function is_pro() {
		return (bool) apply_filters( 'dango_cof_is_pro', false );
	}

	/**
	 * Admin notice when WooCommerce is missing.
	 */
	public function notice_woocommerce_missing() {
		if ( ! current_user_can( 'activate_plugins' ) ) {
			return;
		}
		echo '<div class="notice notice-error"><p>' . esc_html__( 'Dango COD Order Form needs WooCommerce. Please install and activate WooCommerce.', 'dango-cod-order-form' ) . '</p></div>';
	}
}

/**
 * Shortcut to the plugin container.
 *
 * @return Dango_COF_Plugin
 */
function dango_cof() {
	return Dango_COF_Plugin::instance();
}