<?php
/**
 * Automatic release on the release date, and the related emails.
 */

defined( 'ABSPATH' ) || exit;

class Preorvo_Release {

	const HOOK = 'preorvo_release_orders';

	public static function init() {
		add_action( self::HOOK, array( __CLASS__, 'run' ) );
		add_action( 'init', array( __CLASS__, 'schedule' ) );
		add_filter( 'woocommerce_email_classes', array( __CLASS__, 'register_emails' ) );

		// WooCommerce only emails the shop for its own statuses, so new pre-orders are announced here.
		foreach ( array( 'pending', 'failed', 'on-hold', 'cancelled' ) as $from ) {
			add_action( 'woocommerce_order_status_' . $from . '_to_' . Preorvo_Orders::STATUS, array( __CLASS__, 'new_order_emails' ), 10, 2 );
		}
	}

	public static function schedule() {
		if ( ! wp_next_scheduled( self::HOOK ) ) {
			wp_schedule_event( time() + MINUTE_IN_SECONDS, 'hourly', self::HOOK );
		}
	}

	public static function unschedule() {
		wp_clear_scheduled_hook( self::HOOK );
	}

	/**
	 * Release every waiting order whose items are all available. Returns how many were released.
	 */
	public static function run() {
		$released = 0;
		$ids      = wc_get_orders( array(
			'status' => Preorvo_Orders::STATUS,
			'limit'  => -1,
			'return' => 'ids',
			'order'  => 'ASC',
		) );
		foreach ( $ids as $id ) {
			$order = wc_get_order( $id );
			if ( ! $order || Preorvo_Orders::release_time( $order ) ) {
				continue;
			}
			self::release( $order, __( 'Pre-order released: release date reached.', 'preorvo' ) );
			++$released;
		}
		return $released;
	}

	public static function release( $order, $note ) {
		$order->update_meta_data( Preorvo_Orders::META_RELEASED, 'yes' );
		$order->update_status( 'processing', $note );

		$mailer = WC()->mailer();
		$emails = $mailer->get_emails();
		if ( isset( $emails['Preorvo_Email_Released'] ) ) {
			$emails['Preorvo_Email_Released']->trigger( $order->get_id(), $order );
		}
	}

	public static function new_order_emails( $order_id, $order ) {
		$emails = WC()->mailer()->get_emails();
		if ( isset( $emails['WC_Email_New_Order'] ) ) {
			$emails['WC_Email_New_Order']->trigger( $order_id, $order );
		}
		if ( isset( $emails['Preorvo_Email_Received'] ) ) {
			$emails['Preorvo_Email_Received']->trigger( $order_id, $order );
		}
	}

	public static function register_emails( $emails ) {
		require_once __DIR__ . '/class-emails.php';
		$emails['Preorvo_Email_Received'] = new Preorvo_Email_Received();
		$emails['Preorvo_Email_Released'] = new Preorvo_Email_Released();
		return $emails;
	}
}