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/*-
 * ============LICENSE_START=======================================================
 * ONAP - SO
 * ================================================================================
 * Copyright (C) 2017 AT&T Intellectual Property. All rights reserved.
 * ================================================================================
 * 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.
 * ============LICENSE_END=========================================================
 */

package org.onap.aaiclient.client.aai.entities.uri;

import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.net.URI;
import java.util.Map;
import java.util.Optional;
import javax.ws.rs.BadRequestException;
import javax.ws.rs.NotFoundException;
import javax.ws.rs.core.UriBuilder;
import org.onap.aaiclient.client.aai.AAIObjectType;
import org.onap.aaiclient.client.aai.AAIResourcesClient;
import org.onap.aaiclient.client.aai.entities.Results;
import org.onap.aaiclient.client.graphinventory.Format;
import org.onap.aaiclient.client.graphinventory.entities.Pathed;
import org.onap.aaiclient.client.graphinventory.entities.uri.HttpAwareUri;
import org.onap.aaiclient.client.graphinventory.exceptions.GraphInventoryPayloadException;
import org.onap.aaiclient.client.graphinventory.exceptions.GraphInventoryUriComputationException;
import org.onap.aaiclient.client.graphinventory.exceptions.GraphInventoryUriNotFoundException;
import org.onap.aaiclient.client.graphinventory.exceptions.IncorrectNumberOfUriKeys;
import com.fasterxml.jackson.core.type.TypeReference;
import com.fasterxml.jackson.databind.ObjectMapper;

public abstract class HttpLookupUri extends AAISimpleUri implements HttpAwareUri {

    private transient Optional<String> cachedValue = Optional.empty();
    private final AAIObjectType aaiType;

    protected HttpLookupUri(AAIObjectType type, Object... values) {
        super(type, values);
        this.aaiType = type;
    }

    protected HttpLookupUri(AAIObjectType type, UriBuilder builder, Optional<String> cachedValue, Object... values) {
        super(type, builder, values);
        this.cachedValue = cachedValue;
        this.aaiType = type;
    }

    protected String getObjectById(Object id)
            throws GraphInventoryUriNotFoundException, GraphInventoryPayloadException {
        if (!this.getCachedValue().isPresent()) {
            AAIResourceUri serviceInstanceUri = AAIUriFactory.createNodesUri(aaiType, id).format(Format.PATHED);
            String resultJson;
            try {
                resultJson = this.getResourcesClient().get(serviceInstanceUri, NotFoundException.class).getJson();
            } catch (BadRequestException e) {
                throw new GraphInventoryUriNotFoundException(
                        aaiType.typeName() + " " + id + " not found at: " + serviceInstanceUri.build());

            }
            try {
                cachedValue = extractRelatedLink(resultJson);
                if (!cachedValue.isPresent()) {
                    throw new GraphInventoryUriNotFoundException(
                            aaiType.typeName() + " " + id + " not found at: " + serviceInstanceUri.build());
                }
            } catch (IOException e) {
                throw new GraphInventoryPayloadException("could not map payload: " + resultJson, e);
            }
        }
        return cachedValue.get();
    }

    protected Optional<String> extractRelatedLink(String jsonString) throws IOException {
        Optional<String> result;
        ObjectMapper mapper = new ObjectMapper();

        Results<Pathed> results = mapper.readValue(jsonString, new TypeReference<Results<Pathed>>() {});
        if (results.getResult().size() == 1) {
            String uriString = results.getResult().get(0).getResourceLink();
            URI uri = UriBuilder.fromUri(uriString).build();
            String rawPath = uri.getRawPath();
            result = Optional.of(rawPath.replaceAll("/aai/v\\d+", ""));
        } else if (results.getResult().isEmpty()) {
            result = Optional.empty();
        } else {
            throw new IllegalStateException("more than one result returned");
        }

        return result;
    }

    protected Optional<String> getCachedValue() {
        return this.cachedValue;
    }

    @Override
    public URI build() {
        try {
            if (this.values.length == 1) {
                String uri = getObjectById(this.values[0]);
                Map<String, String> map = super.getURIKeys(uri);
                this.values = map.values().toArray(values);
                return super.build(values);
            }
        } catch (GraphInventoryUriNotFoundException | GraphInventoryPayloadException e) {
            throw new GraphInventoryUriComputationException(e);
        }
        return super.build();
    }

    @Override
    public URI locateAndBuild() {
        try {
            if (this.values.length == 1) {
                String uri = getObjectById(this.values[0]);
                Map<String, String> map = super.getURIKeys(uri);
                this.values = map.values().toArray(values);
                return super.build(values);
            }
        } catch (GraphInventoryUriNotFoundException | GraphInventoryPayloadException e) {
            throw new GraphInventoryUriComputationException(e);
        }
        return super.build();
    }

    @Override
    public abstract HttpLookupUri clone();

    @Override
    public void validateValuesSize(String template, Object... values) {
        try {
            super.validateValuesSize(template, values);
        } catch (IncorrectNumberOfUriKeys e) {
            if (values.length == 1) {
                // Special case where we perform an http look up
            } else {
                throw e;
            }
        }
    }

    public AAIResourcesClient getResourcesClient() {
        return new AAIResourcesClient();
    }

    private void writeObject(ObjectOutputStream oos) throws IOException {

        oos.writeUTF(this.cachedValue.orElse(""));
    }

    private void readObject(ObjectInputStream ois) throws IOException {

        String value = ois.readUTF();
        if ("".equals(value)) {
            this.cachedValue = Optional.empty();
        } else {
            this.cachedValue = Optional.ofNullable(value);
        }

    }
}