bp_nouveau_ajax_messages_send_message()

function bp_nouveau_ajax_messages_send_message() {
	global $thread_template, $messages_template;

	$response = array(
		'feedback' => __( 'Your message could not be sent. Please try again.', 'buddyboss' ),
		'type'     => 'error',
	);

	// Verify nonce
	if ( empty( $_POST['nonce'] ) || ! wp_verify_nonce( $_POST['nonce'], 'messages_send_message' ) ) {
		wp_send_json_error( $response );
	}

	// Validate subject and message content
	if ( empty( $_POST['message_content'] ) ) {
		$response['feedback'] = __( 'Your message was not sent. Please enter some content.', 'buddyboss' );

		wp_send_json_error( $response );
	}

	// Validate recipients
	if ( empty( $_POST['send_to'] ) || ! is_array( $_POST['send_to'] ) ) {
		$response['feedback'] = __( 'Please add at least one recipient.', 'buddyboss' );

		wp_send_json_error( $response );
	}

	// Trim @ from usernames
	/**
	 * Filters the results of trimming of `@` characters from usernames for who is set to receive a message.
	 *
	 * @since BuddyPress 3.0.0
	 *
	 * @param array $value Array of trimmed usernames.
	 * @param array $value Array of un-trimmed usernames submitted.
	 */
	$recipients = apply_filters( 'bp_messages_recipients', array_map( function( $username ) {
		return trim( $username, '@' );
	}, $_POST['send_to'] ) );

	// Attempt to send the message.
	$send = messages_new_message( array(
		'recipients' => $recipients,
		'subject'    => wp_trim_words($_POST['message_content'], messages_get_default_subject_length()),
		'content'    => $_POST['message_content'],
		'error_type' => 'wp_error',
	) );

	// Send the message.
	if ( true === is_int( $send ) ) {
		$response = array();

		if ( bp_has_message_threads( array( 'include' => $send ) ) ) {

			while ( bp_message_threads() ) {
				bp_message_thread();
				$last_message_id = (int) $messages_template->thread->last_message_id;

				$response = array(
					'id'            => bp_get_message_thread_id(),
					'message_id'    => (int) $last_message_id,
					'subject'       => strip_tags( bp_get_message_thread_subject() ),
					'excerpt'       => strip_tags( bp_get_message_thread_excerpt() ),
					'content'       => do_shortcode( bp_get_message_thread_content() ),
					'unread'        => bp_message_thread_has_unread(),
					'sender_name'   => bp_core_get_user_displayname( $messages_template->thread->last_sender_id ),
					'sender_is_you' => $messages_template->thread->last_sender_id == bp_loggedin_user_id(),
					'sender_link'   => bp_core_get_userlink( $messages_template->thread->last_sender_id, false, true ),
					'sender_avatar' => esc_url( bp_core_fetch_avatar( array(
						'item_id' => $messages_template->thread->last_sender_id,
						'object'  => 'user',
						'type'    => 'thumb',
						'width'   => BP_AVATAR_THUMB_WIDTH,
						'height'  => BP_AVATAR_THUMB_HEIGHT,
						'html'    => false,
					) ) ),
					'count'         => bp_get_message_thread_total_count(),
					'date'          => strtotime( bp_get_message_thread_last_post_date_raw() ) * 1000,
					'display_date'  => bp_nouveau_get_message_date( bp_get_message_thread_last_post_date_raw() ),
					'started_date'  => date(
						get_option( 'date_format' ),
						strtotime( $messages_template->thread->first_message_date )
					)
				);

				if ( is_array( $messages_template->thread->recipients ) ) {
					foreach ( $messages_template->thread->recipients as $recipient ) {
						if ( empty( $recipient->is_deleted ) ) {
							$response['recipients'][] = array(
								'avatar'    => esc_url( bp_core_fetch_avatar( array(
									'item_id' => $recipient->user_id,
									'object'  => 'user',
									'type'    => 'thumb',
									'width'   => BP_AVATAR_THUMB_WIDTH,
									'height'  => BP_AVATAR_THUMB_HEIGHT,
									'html'    => false,
								) ) ),
								'user_link' => bp_core_get_userlink( $recipient->user_id, false, true ),
								'user_name' => bp_core_get_user_displayname( $recipient->user_id ),
								'is_you'    => $recipient->user_id == bp_loggedin_user_id()
							);
						}
					}
				}

				if ( bp_is_active( 'messages', 'star' ) ) {
					$star_link = bp_get_the_message_star_action_link( array(
						'thread_id' => bp_get_message_thread_id(),
						'url_only'  => true,
					) );

					$response['star_link'] = $star_link;

					$star_link_data         = explode( '/', $star_link );
					$response['is_starred'] = array_search( 'unstar', $star_link_data );

					// Defaults to last
					$sm_id = $last_message_id;

					if ( $response['is_starred'] ) {
						$sm_id = (int) $star_link_data[ $response['is_starred'] + 1 ];
					}

					$response['star_nonce'] = wp_create_nonce( 'bp-messages-star-' . $sm_id );
					$response['starred_id'] = $sm_id;
				}

				$thread_extra_content = bp_nouveau_messages_catch_hook_content( array(
					'inboxListItem' => 'bp_messages_inbox_list_item',
					'threadOptions' => 'bp_messages_thread_options',
				) );

				if ( array_filter( $thread_extra_content ) ) {
					$response = array_merge( $response, $thread_extra_content );
				}
			}
		}

		if ( empty( $response ) ) {
			$response = array( 'id' => $send );
		}

		wp_send_json_success( array(
			'feedback'  => __( 'Message successfully sent.', 'buddyboss' ),
			'type'      => 'success',
			'thread'    => $response,
		) );

	// Message could not be sent.
	} else {
		$response['feedback'] = $send->get_error_message();

		wp_send_json_error( $response );
	}
}