/*******************************************************************************
 * Copyright (c) 2017 Politecnico di Torino and others.
 *
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Apache License, Version 2.0
 * which accompanies this distribution, and is available at
 * http://www.apache.org/licenses/LICENSE-2.0
 *******************************************************************************/
package it.polito.verigraph.validation;

import com.fasterxml.jackson.databind.JsonNode;

import it.polito.verigraph.model.Configuration;
import it.polito.verigraph.model.Graph;
import it.polito.verigraph.model.Node;
import it.polito.verigraph.validation.exception.ValidationException;

public class VpnaccessValidator implements ValidationInterface {

    @Override
    public void validate(Graph graph, Node node, Configuration configuration) throws ValidationException {
        JsonNode configurationNode = configuration.getConfiguration();

        if (!configurationNode.isArray())
            throw new ValidationException("configuration must be an array");

        for (JsonNode object : configurationNode) {
            JsonNode vpnexit = object.get("vpnexit");
            if (!vpnexit.isTextual())
                throw new ValidationException("value corresponding to the key 'vpnexit' must be a string");
            validateObject(graph, node, vpnexit.asText());
        }

    }

    private void validateObject(Graph g, Node node, String field) throws ValidationException {
        boolean isValid = false;
        for (Node n : g.getNodes().values()) {
            if ((n.getFunctional_type().equals("vpnexit")) && (n.getName().equals(field)))
                isValid = true;
        }

        if (!isValid)
            throw new ValidationException("'"+ field + "' is not a valid value for the configuration of a type '"
                    + node.getFunctional_type()
                    + "'. Please use the name of an existing node of type 'vpnexit'.");

    }
}