Sending messages

/**
* Remove default Messages > Compose screen and add our custom one.
*/

function change_messages_compose() {
	global $bp;
    bp_core_remove_subnav_item( 'messages', 'compose' );
	$messages_link = bp_loggedin_user_domain() . $bp->messages->slug . '/';
	bp_core_new_subnav_item( 
		array( 
			'name'            => __( 'Compose', 'buddypress' ),
			'slug'            => 'compose',
			'parent_url'      => $messages_link,
			'parent_slug'     => $bp->messages->slug,
			'screen_function' => 'custom_messages_screen_compose',
			'position'        => 30,
			'user_has_access' => bp_core_can_edit_settings()
		));
}
add_action( 'bp_setup_nav', 'change_messages_compose', 100 );

/**
* Load the custom Messages > Compose screen.
*/
function custom_messages_screen_compose() {

	if ( bp_action_variables() ) {
		bp_do_404();
		return;
	}

	// Remove any saved message data from a previous session.
	messages_remove_callback_values();

	// Check if the message form has been submitted
	if ( isset( $_POST['send'] ) ) {

		// Check the nonce
		check_admin_referer( 'messages_send_message' );

		// If subject is empty, set it to something.
		if ( empty( $_POST['subject'] ) ) {
			$_POST['subject'] = " ";
		}
		
		// Check we have what we need
		if (empty( $_POST['content'] ) ) {
			bp_core_add_message( __( 'There was an error sending that message, please try again fool.', 'buddypress' ), 'error' );
		} else {
			// If this is a notice, send it
			if ( isset( $_POST['send-notice'] ) ) {
				if ( messages_send_notice( $_POST['subject'], $_POST['content'] ) ) {
					bp_core_add_message( __( 'Notice sent successfully!', 'buddypress' ) );
					bp_core_redirect( bp_loggedin_user_domain() . bp_get_messages_slug() . '/inbox/' );
				} else {
					bp_core_add_message( __( 'There was an error sending that notice, please try again', 'buddypress' ), 'error' );
				}
			} else {
				// Filter recipients into the format we need - array( 'username/userid', 'username/userid' )
				$autocomplete_recipients = explode( ',', $_POST['send-to-input'] );
				$typed_recipients        = explode( ' ', $_POST['send_to_usernames'] );
				$recipients              = array_merge( (array) $autocomplete_recipients, (array) $typed_recipients );
				$recipients              = apply_filters( 'bp_messages_recipients', $recipients );
				$thread_id               = messages_new_message( array(
					'recipients' => $recipients,
					'subject'    => $_POST['subject'],
					'content'    => $_POST['content']
				) );

				// Send the message
				if ( ! empty( $thread_id ) ) {
					bp_core_add_message( __( 'Message sent successfully!', 'buddypress' ) );
					bp_core_redirect( bp_loggedin_user_domain() . bp_get_messages_slug() . '/view/' . $thread_id . '/' );
				} else {
					bp_core_add_message( __( 'There was an error sending that message, please try again', 'buddypress' ), 'error' );
				}
			}
		}
	}
	bp_core_load_template( apply_filters( 'messages_template_compose', 'members/single/home' ) );
}