bp_nouveau_ajax_joinleave_group()

function bp_nouveau_ajax_joinleave_group() {
	$response = array(
		'feedback' => sprintf(
			'<div class="bp-feedback error"><span class="bp-icon" aria-hidden="true"></span><p>%s</p></div>',
			esc_html__( 'There was a problem performing this action. Please try again.', 'buddyboss' )
		),
	);

	// Bail if not a POST action.
	if ( ! bp_is_post_request() || empty( $_POST['action'] ) ) {
		wp_send_json_error( $response );
	}

	if ( empty( $_POST['nonce'] ) || empty( $_POST['item_id'] ) || ! bp_is_active( 'groups' ) ) {
		wp_send_json_error( $response );
	}

	// Use default nonce
	$nonce = $_POST['nonce'];
	$check = 'bp_nouveau_groups';

	// Use a specific one for actions needed it
	if ( ! empty( $_POST['_wpnonce'] ) && ! empty( $_POST['action'] ) ) {
		$nonce = $_POST['_wpnonce'];
		$check = $_POST['action'];
	}

	// Nonce check!
	if ( empty( $nonce ) || ! wp_verify_nonce( $nonce, $check ) ) {
		wp_send_json_error( $response );
	}

	// Cast gid as integer.
	$group_id = (int) $_POST['item_id'];

	$errors = array(
		'cannot' => sprintf( '<div class="bp-feedback error"><span class="bp-icon" aria-hidden="true"></span><p>%s</p></div>', esc_html__( 'You cannot join this group.', 'buddyboss' ) ),
		'member' => sprintf( '<div class="bp-feedback error"><span class="bp-icon" aria-hidden="true"></span><p>%s</p></div>', esc_html__( 'You are already a member of the group.', 'buddyboss' ) ),
	);

	if ( groups_is_user_banned( bp_loggedin_user_id(), $group_id ) ) {
		$response['feedback'] = $errors['cannot'];

		wp_send_json_error( $response );
	}

	// Validate and get the group
	$group = groups_get_group( array( 'group_id' => $group_id ) );

	if ( empty( $group->id ) ) {
		wp_send_json_error( $response );
	}

	// Manage all button's possible actions here.
	switch ( $_POST['action'] ) {

		case 'groups_accept_invite':
			if ( ! groups_accept_invite( bp_loggedin_user_id(), $group_id ) ) {
				$response = array(
					'feedback' => sprintf(
						'<div class="bp-feedback error"><span class="bp-icon" aria-hidden="true"></span><p>%s</p></div>',
						esc_html__( 'Group invitation could not be accepted.', 'buddyboss' )
					),
					'type'     => 'error',
				);

			} else {
				if ( bp_is_active( 'activity' ) ) {
					groups_record_activity(
						array(
							'type'    => 'joined_group',
							'item_id' => $group->id,
						)
					);
				}

				// User is now a member of the group
				$group->is_member = '1';

				$response = array(
					'feedback' => sprintf(
						'<div class="bp-feedback success"><span class="bp-icon" aria-hidden="true"></span><p>%s</p></div>',
						esc_html__( 'Group invite accepted.', 'buddyboss' )
					),
					'type'     => 'success',
					'is_user'  => bp_is_user(),
					'contents' => bp_get_group_join_button( $group ),
					'is_group' => bp_is_group(),
				);
			}
			break;

		case 'groups_reject_invite':
			if ( ! groups_reject_invite( bp_loggedin_user_id(), $group_id ) ) {
				$response = array(
					'feedback' => sprintf(
						'<div class="bp-feedback error"><span class="bp-icon" aria-hidden="true"></span><p>%s</p></div>',
						esc_html__( 'Group invite could not be rejected', 'buddyboss' )
					),
					'type'     => 'error',
				);
			} else {
				$response = array(
					'feedback' => sprintf(
						'<div class="bp-feedback success"><span class="bp-icon" aria-hidden="true"></span><p>%s</p></div>',
						esc_html__( 'Group invite rejected', 'buddyboss' )
					),
					'type'     => 'success',
					'is_user'  => bp_is_user(),
				);
			}
			break;

		case 'groups_join_group':
			if ( groups_is_user_member( bp_loggedin_user_id(), $group->id ) ) {
				$response = array(
					'feedback' => $errors['member'],
					'type'     => 'error',
				);
			} elseif ( 'public' !== $group->status ) {
				$response = array(
					'feedback' => $errors['cannot'],
					'type'     => 'error',
				);
			} elseif ( ! groups_join_group( $group->id ) ) {
				$response = array(
					'feedback' => sprintf(
						'<div class="bp-feedback error"><span class="bp-icon" aria-hidden="true"></span><p>%s</p></div>',
						esc_html__( 'Error joining this group.', 'buddyboss' )
					),
					'type'     => 'error',
				);
			} else {
				// User is now a member of the group
				$group->is_member = '1';

				$response = array(
					'contents' => bp_get_group_join_button( $group ),
					'is_group' => bp_is_group(),
					'type'     => 'success',
				);
			}
			break;

			case 'groups_request_membership' :
				if ( ! groups_send_membership_request( bp_loggedin_user_id(), $group->id ) ) {
					$response = array(
						'feedback' => sprintf(
							'<div class="bp-feedback error"><span class="bp-icon" aria-hidden="true"></span><p>%s</p></div>',
							esc_html__( 'Error requesting membership.', 'buddyboss' )
						),
						'type'     => 'error',
					);
				} else {
					// Request is pending
					$group->is_pending = '1';

					$response = array(
						'contents' => bp_get_group_join_button( $group ),
						'is_group' => bp_is_group(),
						'type'     => 'success',
					);
				}
				break;

			case 'groups_leave_group' :
				if ( ! groups_leave_group( $group->id ) ) {
					$response = array(
						'feedback' => sprintf(
							'<div class="bp-feedback error"><span class="bp-icon" aria-hidden="true"></span><p>%s</p></div>',
							esc_html__( 'Error leaving group.', 'buddyboss' )
						),
						'type'     => 'error',
					);
				} else {
					// User is no more a member of the group
					$group->is_member = '0';
					$bp               = buddypress();

					/**
					 * When inside the group or in the loggedin user's group memberships screen
					 * we need to reload the page.
					 */
					$bp_is_group = bp_is_group() || ( bp_is_user_groups() && bp_is_my_profile() );

					$response = array(
						'contents' => bp_get_group_join_button( $group ),
						'is_group' => $bp_is_group,
						'type'     => 'success',
					);

					// Reset the message if not in a Group or in a loggedin user's group memberships one!
					if ( ! $bp_is_group && isset( $bp->template_message ) && isset( $bp->template_message_type ) ) {
						unset( $bp->template_message, $bp->template_message_type );

						@setcookie( 'bp-message', false, time() - 1000, COOKIEPATH, COOKIE_DOMAIN, is_ssl() );
						@setcookie( 'bp-message-type', false, time() - 1000, COOKIEPATH, COOKIE_DOMAIN, is_ssl() );
					}
				}
				break;
	}

	if ( 'error' === $response['type'] ) {
		wp_send_json_error( $response );
	}

	wp_send_json_success( $response );
}