/*
 * Copyright 2016-present Open Networking Laboratory
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.opencord.cordvtn.codec;

import com.fasterxml.jackson.databind.JsonNode;
import com.fasterxml.jackson.databind.node.NullNode;
import org.hamcrest.Description;
import org.hamcrest.TypeSafeDiagnosingMatcher;
import org.opencord.cordvtn.api.net.NetworkId;
import org.opencord.cordvtn.api.net.ServiceNetwork;

import java.util.Objects;

import static org.opencord.cordvtn.api.net.ServiceNetwork.DependencyType.BIDIRECTIONAL;

/**
 * Json matcher for ServiceNetwork.
 */
public final class ServiceNetworkJsonMatcher extends TypeSafeDiagnosingMatcher<JsonNode> {

    private final ServiceNetwork network;

    private ServiceNetworkJsonMatcher(ServiceNetwork network) {
        this.network = network;
    }

    /**
     * Factory to allocate ServiceNetwork matcher.
     *
     * @param network service network object to match
     * @return matcher
     */
    public static ServiceNetworkJsonMatcher matchesServiceNetwork(ServiceNetwork network) {
        return new ServiceNetworkJsonMatcher(network);
    }

    @Override
    protected boolean matchesSafely(JsonNode jsonNet, Description description) {
        String jsonNetId = jsonNet.get("id").asText();
        if (!Objects.equals(jsonNetId, network.id().id())) {
            description.appendText("network id was " + jsonNetId);
            return false;
        }

        String jsonType = jsonNet.get("type").asText().toUpperCase();
        if (!Objects.equals(jsonType, network.type().name())) {
            description.appendText("type was " + jsonType);
            return false;
        }

        if (network.providers() == null || network.providers().isEmpty()) {
            return true;
        }

        JsonNode jsonProviders = jsonNet.get("providers");
        if (network.providers().isEmpty()) {
            if (jsonProviders != null &&
                    jsonProviders != NullNode.getInstance() &&
                    jsonProviders.size() != 0) {
                description.appendText("provider networks did not match");
                return false;
            }
        } else {
            if (jsonProviders == null ||
                    jsonProviders == NullNode.getInstance() ||
                    jsonProviders.size() == 0) {
                description.appendText("provider networks did not match");
                return false;
            } else if (jsonProviders.size() != network.providers().size()) {
                description.appendText("provider networks did not match");
                return false;
            } else {
                for (JsonNode provider : jsonProviders) {
                    NetworkId id = NetworkId.of(provider.get("id").asText());
                    boolean bidirectional = provider.get("bidirectional").asBoolean();

                    if (!network.providers().containsKey(id)) {
                        final String msg = String.format("provider id:%s couldn't find", id);
                        description.appendText(msg);
                        return false;
                    }
                    if (network.providers().get(id).equals(BIDIRECTIONAL) != bidirectional) {
                        final String msg = String.format(
                                "mismatch provider id:%s, bidirectional: %s",
                                id, bidirectional);
                        description.appendText(msg);
                        return false;
                    }
                }
            }
        }
        return true;
    }

    @Override
    public void describeTo(Description description) {
        description.appendText(network.toString());
    }
}