mycred EE 4.6+ gateway

<?php
if ( ! defined( 'myCRED_VERSION' ) ) exit;

/**
 * Event Espresso
 * Allow users to pay for event tickets using myCRED Points
 * @since 1.6.5
 * @version 1.0
 */
if ( ! class_exists( 'EE_myCRED' ) ) :
	class EE_myCRED extends EE_Onsite_Gateway {

		private static $_instance = NULL;

		public static function instance( EEM_Gateways &$model ) {
			// check if class object is instantiated
			if ( self::$_instance === NULL or ! is_object( self::$_instance ) or ! ( self::$_instance instanceof EE_myCRED ) ) {
				self::$_instance = new self( $model );
				//echo '<h3>'. __CLASS__ .'->'.__FUNCTION__.'  ( line no: ' . __LINE__ . ' )</h3>';
			}
			return self::$_instance;
		}

		protected function __construct( EEM_Gateways &$model ) {
			$this->_gateway_name = mycred_label();
			$this->_button_base = '';
			$this->_path = str_replace( '\\', '/', __FILE__ );

			parent::__construct( $model );

			if ( ! isset( $this->_payment_settings['type'] ) )
				$this->_payment_settings['type'] = 'mycred_default';

			$this->mycred = mycred( $this->_payment_settings['type'] );
		}

		protected function _default_settings() {
			$label = mycred_label();
			$this->_payment_settings['display_name']      = $label;
			$this->_payment_settings['label_payment']     = sprintf( '%s Payment', $label );
			$this->_payment_settings['type']              = 'mycred_default';
			$this->_payment_settings['rate']              = 1;
			$this->_payment_settings['log']               = 'Payment for Event Registration';
			$this->_payment_settings['message_solvent']   = 'Pay using your %_plural%';
		}

		protected function _update_settings() {
			$this->_payment_settings['display_name']      = sanitize_text_field( $_POST['mycred_display_name'] );
			$this->_payment_settings['type']              = sanitize_text_field( $_POST['mycred_type'] );
			$this->_payment_settings['rate']              = sanitize_text_field( $_POST['mycred_rate'] );
			$this->_payment_settings['log']               = strip_tags( $_POST['mycred_log'], '<br /><span><a>' );
			$this->_payment_settings['message_solvent']   = sanitize_text_field( $_POST['mycred_message_solvent'] );
		}

		public function espresso_reg_page_billing_inputs() {

		}

		protected function _display_settings() {
			$mycred_types = mycred_get_types();
			$currency = EE_Config::instance()->currency; ?>

		<tr>
			<th>
				<label for="mycred_label_gateway">Gateway Display Name</label>
			</th>
			<td>
				<input class="regular-text" type="text" name="mycred_display_name" size="30" value="<?php echo stripslashes_deep( $this->_payment_settings['display_name'] ); ?>" /><br />
				<span class="description"><?php _e( 'Payment gateway title to use in the front end.', 'mycred' ); ?></span>
			</td>
		</tr>

		<?php if ( count( $mycred_types ) > 1 ) : ?>

		<tr>
			<th>
				<label for="mycred_type">Point Type</label>
			</th>
			<td>
				<?php mycred_types_select_from_dropdown( 'mycred_type', 'mycred_type', $this->_payment_settings['type'] ); ?><br />
				<span class="description">Select the point type that users can use to pay for event tickets.</span>
			</td>
		</tr>

		<?php else : ?>

		<tr>
			<th>&nbsp;</th>
			<td><input type="hidden" name="mycred_type" value="mycred_default" /></td>
		</tr>

		<?php endif; ?>

		<tr>
			<th>
				<label for="mycred_rate">Exchange Rate</label>
			</th>
			<td>
				<?php echo number_format( 1, $currency->dec_plc, $currency->dec_mrk, $currency->thsnds ); ?> <?php echo $currency->code; ?> = <input type="text" name="mycred_rate" size="5" value="<?php echo $this->_payment_settings['rate']; ?>" style="width: 120px;" /> <?php if ( $this->_payment_settings['rate'] == 1 ) echo $this->mycred->singular(); else echo $this->mycred->plural(); ?><br />
				<span class="description"></span>
			</td>
		</tr>

		<tr>
			<th>
				<label for="mycred_log">Log Template</label>
			</th>
			<td>
				<input type="text" name="mycred_log" style="width: 100%;" value="<?php echo esc_attr( $this->_payment_settings['log'] ); ?>" />
			</td>
		</tr>

		<tr>
			<th>&nbsp;</th>
			<td>&nbsp;</td>
		</tr>

		<tr>
			<th>
				<label for="mycred_message_solvent">Gateway Message</label>
			</th>
			<td>
				<input type="text" name="mycred_message_solvent" style="width: 100%;" value="<?php echo esc_attr( $this->_payment_settings['message_solvent'] ); ?>" /><br />
				<span class="description">Message to show when a user selects this gateway for payment. Leave empty to hide.</span>
			</td>
		</tr>
		<tr>
			<th>
				<label for="mycred_message_visitors">Important</label>
			</th>
			<td><span class="description">Visitors and insolvent users will not have access to this gateway!</span></td>
		</tr>
<?php

		}

		protected function _display_settings_help() {

		}

		public function espresso_display_payment_gateways( $selected_gateway = '' ) {
			if ( ! is_user_logged_in() ) return;

			$session_data = EE_Registry::instance()->SSN->get_session_data();
			if ( ! isset( $session_data['cart'] ) ) return;

			$cart = $session_data['cart'];

			$buyer_id = absint( $session_data['user_id'] );
			$balance = $this->mycred->get_users_balance( $buyer_id, $this->_payment_settings['type'] );

			$cart_total = $cart->get_cart_grand_total();
			$cost = $this->mycred->number( $cart_total * $this->_payment_settings['rate'] );

			if ( $balance < $cost ) return;

			$this->_css_class = $selected_gateway == $this->_gateway_name ? '' : ' hidden';
			echo $this->_generate_payment_gateway_selection_button();

?>

<div id="reg-page-billing-info-<?php echo $this->_gateway_name; ?>-dv" class="reg-page-billing-info-dv <?php echo $this->_css_class; ?>">
	<h3><?php echo $this->_payment_settings['label_gateway']; ?></h3>
	<p><?php echo $this->_payment_settings['message_solvent']; ?></p>
	<table class="table">
		<thead>
			<tr>
				<th>Current Balance</th>
				<th>Cost</th>
			</tr>
		</thead>
		<tbody>
			<tr>
				<td><?php echo $this->mycred->format_creds( $balance ); ?></td>
				<td><?php echo $this->mycred->format_creds( $cost ); ?></td>
			</tr>
		</tbody>
	</table>
</div>
<?php
		}

		/**
		 * @param EE_Line_Item $line_item
		 * @return boolean
		 */
		public function process_payment_start( EE_Line_Item $total_line_item, $transaction = null, $total_to_charge = null ) {
			$session_data = EE_Registry::instance()->SSN->get_session_data();

			if ( is_user_logged_in() ) {

				$item_num = 1;
				if ( ! $transaction )
					$transaction = $total_line_item->transaction();

				$buyer_id = get_current_user_id();
				$primary_registrant = $transaction->primary_registration();

				$balance = $this->mycred->get_users_balance( $buyer_id );

				$cart_total = $total_line_item->total();
				$cost = $this->mycred->number( $cart_total * $this->_payment_settings['rate'] );

				// Solvent
				if ( $balance >= $cost ) {

					// Charge
					$charge = $this->mycred->add_creds(
						'event_ticket_payment',
						$buyer_id,
						0-$cost,
						$this->_payment_settings['log'],
						'',
						'',
						$this->_payment_settings['type']
					);

					$this->_debug_log("<hr>No Previous IPN payment received. Create a new one");

					if ( $charge ) {

						$payment_status = EEM_Payment::status_id_approved;

						//no previous payment exists, create one
						$primary_registration_code = ! empty( $primary_registrant ) ? $primary_registrant->reg_code() : '';

						$payment = EE_Payment::new_instance( array(
							'TXN_ID'               => $transaction->ID(),
							'STS_ID'               => $payment_status,
							'PAY_timestamp'        => current_time( 'mysql', false ),
							'PAY_method'           => 'CART',
							'PAY_amount'           => $cart_total,
							'PAY_gateway'          => $this->_gateway_name,
							'PAY_gateway_response' => 'Account successfully charged',
							'PAY_txn_id_chq_nmbr'  => time() . $buyer_id,
							'PAY_po_number'        => NULL,
							'PAY_extra_accntng'    => $this->mycred->format_creds( $cost ),
							'PAY_via_admin'        => false,
							'PAY_details'          => ''
						) );

						$success = $payment->save();
						$successful_update_of_transaction = $this->update_transaction_with_payment( $transaction, $payment );

						$return = array( 'success' => true );
					}

				}

				// Insolvent
				else {

					$payment_status = EEM_Payment::status_id_declined;

					$primary_registration_code = ! empty( $primary_registrant ) ? $primary_registrant->reg_code() : '';

					$payment = EE_Payment::new_instance( array(
						'TXN_ID'               => $transaction->ID(),
						'STS_ID'               => $payment_status,
						'PAY_timestamp'        => current_time( 'mysql', false ),
						'PAY_method'           => 'CART',
						'PAY_amount'           => $cart_total,
						'PAY_gateway'          => $this->_gateway_name,
						'PAY_gateway_response' => 'Insufficient Funds',
						'PAY_txn_id_chq_nmbr'  => NULL,
						'PAY_po_number'        => NULL,
						'PAY_extra_accntng'    => $primary_registration_code,
						'PAY_via_admin'        => false,
						'PAY_details'          => ''
						) );

					$payment->save();
					$return = array( 'success' => true );

				}

			} else {
				$return = array( 'error' => 'Only registered members can use this payment gateway. Please login and try again.' );
				// no payment required
			}

			return $return;
		}

	}
endif;