bp_nouveau_ajax_addremove_friend()

function bp_nouveau_ajax_addremove_friend() {
	$response = array(
		'feedback' => sprintf(
			'<div class="bp-feedback error bp-ajax-message"><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() ) {
		wp_send_json_error( $response );
	}

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

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

	// 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 fid as an integer.
	$friend_id = (int) $_POST['item_id'];

	// Check if the user exists only when the Friend ID is not a Frienship ID.
	if ( isset( $_POST['action'] ) && $_POST['action'] !== 'friends_accept_friendship' && $_POST['action'] !== 'friends_reject_friendship' ) {
		$user = get_user_by( 'id', $friend_id );
		if ( ! $user ) {
			wp_send_json_error(
				array(
					'feedback' => sprintf(
						'<div class="bp-feedback error">%s</div>',
						esc_html__( 'No member found by that ID.', 'buddyboss' )
					),
				)
			);
		}
	}

	// In the 2 first cases the $friend_id is a friendship id.
	if ( ! empty( $_POST['action'] ) && 'friends_accept_friendship' === $_POST['action'] ) {
		if ( ! friends_accept_friendship( $friend_id ) ) {
			wp_send_json_error(
				array(
					'feedback' => sprintf(
						'<div class="bp-feedback error">%s</div>',
						esc_html__( 'There was a problem accepting that request. Please try again.', 'buddyboss' )
					),
				)
			);
		} else {
			wp_send_json_success(
				array(
					'feedback' => sprintf(
						'<div class="bp-feedback success">%s</div>',
						esc_html__( 'Connection accepted.', 'buddyboss' )
					),
					'type'         => 'success',
					'is_user'      => true,
					'friend_count' => friends_get_friend_count_for_user( bp_loggedin_user_id() ),
				)
			);
		}

	// Rejecting a friendship
	} elseif ( ! empty( $_POST['action'] ) && 'friends_reject_friendship' === $_POST['action'] ) {
		if ( ! friends_reject_friendship( $friend_id ) ) {
			wp_send_json_error(
				array(
					'feedback' => sprintf(
						'<div class="bp-feedback error">%s</div>',
						esc_html__( 'There was a problem rejecting that request. Please try again.', 'buddyboss' )
					),
				)
			);
		} else {
			wp_send_json_success(
				array(
					'feedback' => sprintf(
						'<div class="bp-feedback success">%s</div>',
						esc_html__( 'Connection rejected.', 'buddyboss' )
					),
					'type'         => 'success',
					'is_user'      => true,
					'friend_count' => friends_get_friend_count_for_user( bp_loggedin_user_id() ),
				)
			);
		}

	// Trying to cancel friendship.
	} elseif ( 'is_friend' === BP_Friends_Friendship::check_is_friend( bp_loggedin_user_id(), $friend_id ) ) {
		if ( ! friends_remove_friend( bp_loggedin_user_id(), $friend_id ) ) {
			$response['feedback'] = sprintf(
				'<div class="bp-feedback error">%s</div>',
				esc_html__( 'Connection could not be cancelled.', 'buddyboss' )
			);

			wp_send_json_error( $response );
		} else {
			$is_user = bp_is_my_profile();

			if ( ! $is_user ) {
				$response = array( 'contents' => bp_get_add_friend_button( $friend_id, false, array(
					'parent_element' => 'li',
					'button_element' => 'button'
				) ), 'friend_count' => friends_get_friend_count_for_user( bp_loggedin_user_id() ) );
			} else {
				$response = array(
					'feedback' => sprintf(
						'<div class="bp-feedback success">%s</div>',
						esc_html__( 'Connection removed.', 'buddyboss' )
					),
					'type'         => 'success',
					'is_user'      => $is_user,
					'friend_count' => friends_get_friend_count_for_user( bp_loggedin_user_id() ),
				);
			}

			wp_send_json_success( $response );
		}

	// Trying to request friendship.
	} elseif ( 'not_friends' === BP_Friends_Friendship::check_is_friend( bp_loggedin_user_id(), $friend_id ) ) {
		if ( ! friends_add_friend( bp_loggedin_user_id(), $friend_id ) ) {
			$response['feedback'] = sprintf(
				'<div class="bp-feedback error">%s</div>',
				esc_html__( 'Connection could not be requested.', 'buddyboss' )
			);

			wp_send_json_error( $response );
		} else {
			wp_send_json_success( array( 'contents' => bp_get_add_friend_button( $friend_id, false, array(
				'parent_element' => 'li',
				'button_element' => 'button'
			) ) ) );
		}

	// Trying to cancel pending request.
	} elseif ( 'pending' === BP_Friends_Friendship::check_is_friend( bp_loggedin_user_id(), $friend_id ) ) {
		if ( friends_withdraw_friendship( bp_loggedin_user_id(), $friend_id ) ) {
			wp_send_json_success( array( 'contents' => bp_get_add_friend_button( $friend_id, false, array(
				'parent_element' => 'li',
				'button_element' => 'button'
			) ) ) );
		} else {
			$response['feedback'] = sprintf(
				'<div class="bp-feedback error">%s</div>',
				esc_html__( 'Connection request could not be cancelled.', 'buddyboss' )
			);

			wp_send_json_error( $response );
		}

	// Request already pending.
	} else {
		$response['feedback'] = sprintf(
			'<div class="bp-feedback error">%s</div>',
			esc_html__( 'Request Pending', 'buddyboss' )
		);

		wp_send_json_error( $response );
	}
}