/*-
 * ============LICENSE_START=======================================================
 * SDC
 * ================================================================================
 * 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.openecomp.sdc.be.components.impl;

import org.apache.commons.collections.MapUtils;
import org.openecomp.sdc.be.components.ArtifactsResolver;
import org.openecomp.sdc.be.datatypes.enums.ComponentTypeEnum;
import org.openecomp.sdc.be.model.ArtifactDefinition;
import org.openecomp.sdc.be.model.Component;
import org.openecomp.sdc.be.model.ComponentInstance;
import org.openecomp.sdc.be.model.InterfaceDefinition;
import org.openecomp.sdc.be.model.Service;

import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collections;
import java.util.List;
import java.util.Map;
import java.util.Objects;
import java.util.Optional;
import java.util.stream.Collectors;

@org.springframework.stereotype.Component("artifact-resolver")
public class ArtifactResolverImpl implements ArtifactsResolver {

    @Override
    public ArtifactDefinition findArtifactOnComponent(Component component, ComponentTypeEnum componentType, String artifactId) {
        List<ArtifactDefinition> allComponentsArtifacts = getAllComponentsArtifacts(component, componentType);
        return findById(allComponentsArtifacts, artifactId);

    }

    @Override
    public ArtifactDefinition findArtifactOnComponentInstance(ComponentInstance componentInstance, String artifactId) {
        List<ArtifactDefinition> allInstanceArtifacts = getAllInstanceArtifacts(componentInstance);
        return findById(allInstanceArtifacts, artifactId);
    }

    private ArtifactDefinition findById(List<ArtifactDefinition> artifacts, String artifactId) {
        return artifacts.stream()
                        .filter(artifact -> artifact.getUniqueId().equals(artifactId))
                        .findFirst().orElse(null);
    }

    private List<ArtifactDefinition> getAllComponentsArtifacts(Component component, ComponentTypeEnum componentType) {
        Map<String, ArtifactDefinition> deploymentArtifacts = Optional.ofNullable(component.getDeploymentArtifacts()).orElse(Collections.emptyMap());
        Map<String, ArtifactDefinition> artifacts = Optional.ofNullable(component.getArtifacts()).orElse(Collections.emptyMap());
        Map<String, ArtifactDefinition> interfaceArtifacts= Collections.emptyMap();
        Map<String, InterfaceDefinition> interfaces = component.getInterfaces();
        if (MapUtils.isNotEmpty(interfaces)) {
            interfaceArtifacts = interfaces.values().stream()
                    .flatMap(inte -> inte.getOperationsMap().values().stream())
                    .map(operation -> operation.getImplementationArtifact()).filter(Objects::nonNull)
                    .collect(Collectors.toMap(artifactDefinition -> artifactDefinition.getUniqueId(),
                            artifactDefinition -> artifactDefinition, (a1, a2) -> a1));
        }

        Map<String, ArtifactDefinition> serviceApiArtifacts = Collections.emptyMap();
        if (componentType == ComponentTypeEnum.SERVICE) {
            serviceApiArtifacts = Optional.ofNullable(((Service) component).getServiceApiArtifacts()).orElse(Collections.emptyMap());
        }

        return appendAllArtifacts(deploymentArtifacts, artifacts, interfaceArtifacts, serviceApiArtifacts);
    }

    private List<ArtifactDefinition> getAllInstanceArtifacts(ComponentInstance instance) {
        Map<String, ArtifactDefinition> deploymentArtifacts = Optional.ofNullable(instance.getDeploymentArtifacts()).orElse(Collections.emptyMap());
        Map<String, ArtifactDefinition> artifacts = Optional.ofNullable(instance.getArtifacts()).orElse(Collections.emptyMap());
        return appendAllArtifacts(deploymentArtifacts, artifacts);
    }

    @SafeVarargs
    private final List<ArtifactDefinition> appendAllArtifacts(Map<String, ArtifactDefinition>... artifacts) {
        List<ArtifactDefinition> allArtifacts = new ArrayList<>();
        Arrays.stream(artifacts).forEach(a -> allArtifacts.addAll(a.values()));
        return allArtifacts;
    }

}