<?php


class Xoo_Wl_Core{

	protected static $_instance = null;
	public $waitlist_table, $waitlist_meta_table;
	public $history_count = 50;

	public static function get_instance(){
		if ( is_null( self::$_instance ) ) {
			self::$_instance = new self();
		}
		return self::$_instance;
	}

	public function __construct(){
		$this->hooks();
	}

	public function hooks(){
		add_action( 'wp_ajax_xoo_wl_form_submit', array( $this, 'form_submit' ) );
		add_action( 'wp_ajax_nopriv_xoo_wl_form_submit', array( $this, 'form_submit' ) );
		add_action( 'xoo_wl_cron_send_back_in_stock_email_for_product', array( $this, 'cron_send_back_in_stock_email_for_product' ) );
		add_action( 'xoo_wl_form_submit_success', array( $this, 'save_wpml_lang_meta' ) );
		add_action( 'init', array( $this, 'schedule_crons_in_queue' ) ); 
	}


	public function form_submit(){
		
		$meta_fields = array();

		try {

			$product_id = (int) $_POST['_xoo_wl_product_id'];
			$email 		= sanitize_email( $_POST['xoo_wl_user_email'] );
			$quantity 	= isset( $_POST['xoo_wl_required_qty'] ) ? (float) $_POST['xoo_wl_required_qty'] : 1;

			$error = new WP_Error();

			if( !$product_id ){
				$error->add( 'no-id', 'Something went wrong. please contact support.' );
			}

			if( !$email ){
				$error->add( 'no-email', __( 'Email address is required.', 'wailist-woocommerce' ) );
			}
			
			if( !xoo_wl_should_show_waitlist( $product_id ) ){
				$error->add( 'in-stock', __( 'You cannot currently join this waitlist.', 'waitlist-woocommerce' ) );
			}

			$error = apply_filters( 'xoo_wl_process_errors', $error, $product_id, $email );

			if ( $error->get_error_code() ) {
				throw new Xoo_Exception( $error );
			}

			$fieldValues = xoo_wl()->aff->fields->validate_submitted_field_values( $_POST );

			if( is_wp_error( $fieldValues ) ){
				$message = '';
				if( count( $fieldValues->get_error_messages() ) > 1 ){
					foreach ( $fieldValues->get_error_messages() as $error_message ) {
						$message .= '<p>'.$error_message.'</p>';
					}
				}
				else{
					$message = $fieldValues;
				}

				throw new Xoo_Exception( $message );
			}

			$waitlist_meta_data = $fieldValues;
			unset( $waitlist_meta_data[ 'xoo_wl_user_email' ] );
			unset( $waitlist_meta_data['xoo_wl_required_qty'] );

			$waitlist_data = array(
				'product_id' 	=> $product_id,
				'email' 		=> $email,
				'quantity' 		=> $quantity ? $quantity : 1,
				'product_name' 	=> xoo_wl_get_product_name(wc_get_product($product_id)),
				'meta' 			=> $waitlist_meta_data
			);

			

			$inserted_id = xoo_wl_db()->update_waitlist_row( $waitlist_data );

			if( is_wp_error( $inserted_id ) ){
				throw new Xoo_Exception( $inserted_id->get_error_message() );	
			}

			do_action( 'xoo_wl_form_submit_success', $inserted_id );

			$message = apply_filters( 'xoo_wl_form_submit_success_notice', '<span class="xoo-wl-icon-check_circle xoo-wl-scs-icon"></span>'.xoo_wl_helper()->get_general_option( 'txt-success-notice' ) );

			wp_send_json( array(
				'error' 	=> 0,
				'notice' 	=> xoo_wl_add_notice( $message, 'success' )
			) );

			
		} catch ( Xoo_Exception $e) {


			$message = apply_filters( 'xoo_wl_form_submit_error', $e->getMessage(), $e->getWpErrorCode() );

			do_action( 'xoo_wl_form_submit_failed', $e );

			wp_send_json( array(
				'error' 		=> 1,
				'notice' 		=> xoo_wl_add_notice( $message, 'error' ),
			) );
		}	

	}



	public function send_back_in_stock_email( $row_id ){
		return xoo_wl_emails()->emails['backInStock']->trigger( $row_id );
	}


	public function get_crons_in_queue(){
		return (array) get_option( 'xoo_wl_crons_in_queue' );
	}


	public function trigger_back_in_stock_email_for_product( $product_id ){

		$validate_product = xoo_wl_emails()->emails['backInStock']->product_validation( $product_id );

		if( is_wp_error( $validate_product ) ){
			return $validate_product;
		}

		$crons = xoo_wl_db()->get_cron_rows_by_product_id( $product_id, array( 'inqueue', 'processing' ) );

		if( !empty( $crons ) ){
			
			return new WP_Error( 'in-process', 'Emails are already in process for this product. Please wait for it to finish.' );
			
		}

		$rows = xoo_wl_db()->get_waitlist_rows_by_product( $product_id );

		if( !$rows || empty( $rows ) ) return;

		$new_cron = array(
			'product_id' 	=> $product_id,
			'status' 		=> 'inqueue',
			'emails_count' 	=> count( $rows )
		);


		xoo_wl_db()->insert_cron_row( $new_cron );

		update_option( 'xoo-wl-schedule-crons', 'yes' );

		xoo_wl_db()->cleanup_crons();

		$this->schedule_crons_in_queue();

		return true;

	}

	public function schedule_crons_in_queue(){

		if( get_option( 'xoo-wl-schedule-crons' ) === 'no' ) return;

		$crons 		= xoo_wl_db()->get_cron_rows_by_status( 'inqueue', array(
			'limit' => 1
		) );

		if( empty( $crons ) ){
			update_option( 'xoo-wl-schedule-crons', 'no' );
			return;
		}

		$cron = $crons[0];
		
		wp_schedule_single_event( time(), 'xoo_wl_cron_send_back_in_stock_email_for_product', array(
			$cron->cron_id
		) );


		xoo_wl()->run_cron();
		
	}


	public function get_email_cron_history(){
		return (array) json_decode( get_option( 'xoo_wl_cron_emails' ), true );
	}


	public function cron_send_back_in_stock_email_for_product( $cron_id ){

		$cron = xoo_wl_db()->get_cron_row_by_id( $cron_id );

		if( !$cron ) return;

		$product_id = (int) $cron->product_id;

		$rows = xoo_wl_db()->get_waitlist_rows_by_product( $product_id );

		xoo_wl_db()->update_cron_row(
			array(
				'status' => 'processing'
			),
			array(
				'cron_id' => $cron_id
			)
		);

		foreach ( $rows as $row_data ) {
			$this->send_back_in_stock_email( $row_data->xoo_wl_id );
		}

		xoo_wl_db()->update_cron_row(
			array(
				'status' => 'completed'
			),
			array(
				'cron_id' => $cron_id
			)
		);

		$this->schedule_crons_in_queue();

	}

	public function save_wpml_lang_meta( $row_id ){
		if( !isset( $_POST['xoo-wl-wpml-lang'] ) ) return;
		$lang = sanitize_text_field( $_POST['xoo-wl-wpml-lang'] );
		xoo_wl_db()->update_waitlist_meta( $row_id, 'wpml_lang', $lang );
	}

}

function xoo_wl_core(){
	return Xoo_Wl_Core::get_instance();
}
xoo_wl_core();

?>