/*
 * Copyright 2006-2019 DLR, Germany
 * 
 * SPDX-License-Identifier: EPL-1.0
 * 
 * http://www.rcenvironment.de/
 */

package de.rcenvironment.core.component.model.api;

import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.io.Serializable;
import java.util.Map;

import org.apache.commons.logging.LogFactory;

import de.rcenvironment.core.communication.common.LogicalNodeId;
import de.rcenvironment.core.communication.common.NodeIdentifierUtils;
import de.rcenvironment.core.component.api.ComponentConstants;
import de.rcenvironment.core.component.api.ComponentUtils;
import de.rcenvironment.core.component.execution.api.Component;
import de.rcenvironment.core.component.model.configuration.api.ConfigurationDescription;
import de.rcenvironment.core.component.model.endpoint.api.EndpointDefinitionsProvider;
import de.rcenvironment.core.component.model.endpoint.api.EndpointDescriptionsManager;
import de.rcenvironment.core.datamodel.api.EndpointType;

/**
 * Class holding information about an installed {@link Component}.
 * 
 * @author Roland Gude
 * @author Jens Ruehmkorf
 * @author Doreen Seider
 * @author Robert Mischke
 * @author Christian Weiss
 * @author Sascha Zur
 * @author David Scholz
 * 
 * Note: It is actually the model of a component when it is dragged into the workflow editor. It holds the configuration of a
 * component, its dynamic endpoints, etc. More editor-related information are put into the {@link WorkflowNode}.
 * {@link ComponentDescription} is embedded in a {@link WorkflowNode}. A {@link ComponentDescription} belongs to exactly one
 * {@link ComponentInstallation}. The {@link ComponentInstallation} is mutable which I doubt to be good. It is done to change the
 * {@link ComponentInstallation} at workflow start to the one of the target instance the user chose to run the component on.
 * --seid_do
 * 
 */
public class ComponentDescription implements Serializable, Cloneable, Comparable<ComponentDescription> {

    /**
     * Prefix for {@link java.beans.PropertyChangeEvent}s concerning properties.
     */
    public static final String PROPERTIES_PREFIX = "properties.";

    /** Key of default configuration map. */
    public static final String DEFAULT_CONFIG_ID = "de.rcenvironment.rce.component.configuration.default";

    private static final long serialVersionUID = -7551319972711119245L;

    private ComponentInstallation componentInstallation;

    private ComponentRevision componentRevision;

    private ComponentInterface componentInterface;

    private final EndpointDescriptionsManager inputDescriptionsManager;

    private final EndpointDescriptionsManager outputDescriptionsManager;

    private ConfigurationDescription configurationDescription;

    private boolean isNodeIdTransient = false;

    public ComponentDescription(ComponentInstallation componentInstallation) {

        this.componentInstallation = componentInstallation;
        this.componentRevision = componentInstallation.getComponentRevision();
        this.componentInterface = componentRevision.getComponentInterface();

        inputDescriptionsManager = new EndpointDescriptionsManager(componentInterface.getInputDefinitionsProvider(),
                EndpointType.INPUT);

        outputDescriptionsManager = new EndpointDescriptionsManager(componentInterface.getOutputDefinitionsProvider(),
                EndpointType.OUTPUT);

        configurationDescription = new ConfigurationDescription(componentInterface.getConfigurationDefinition(),
                componentInterface.getConfigurationExtensionDefinitions());

    }

    /**
     * Initializes the component with default initial values such as endpoints.
     * May only be called for newly created components.
     */
    public void initializeWithDefaults() {
        inputDescriptionsManager.addInitialDynamicEndpointDescriptions();
        outputDescriptionsManager.addInitialDynamicEndpointDescriptions();
        configurationDescription.setConfigurationValue(ComponentConstants.CONFIG_KEY_STORE_DATA_ITEM,
                String.valueOf(true));
    }

    public String getIdentifier() {
        return componentInterface.getIdentifierAndVersion();
    }

    /**
     * @return name of implementing class
     */
    public String getClassName() {
        return componentRevision.getClassName();
    }

    public String getName() {
        return componentInterface.getDisplayName();
    }

    public String getGroup() {
        return componentInterface.getGroupName();
    }

    public String getVersion() {
        return componentInterface.getVersion();
    }

    public ComponentSize getSize() {
        return componentInterface.getSize();
    }

    public boolean getIsNodeIdTransient() {
        return isNodeIdTransient;
    }

    public void setIsNodeIdTransient(boolean isNodeTransient) {
        this.isNodeIdTransient = isNodeTransient;
    }

    public EndpointDescriptionsManager getInputDescriptionsManager() {
        return inputDescriptionsManager;
    }

    public EndpointDescriptionsManager getOutputDescriptionsManager() {
        return outputDescriptionsManager;
    }

    public EndpointDefinitionsProvider getDeclarativeInputDescriptionsProvider() {
        return componentInterface.getInputDefinitionsProvider();
    }

    public EndpointDefinitionsProvider getDeclarativeOutputDescriptionsProvider() {
        return componentInterface.getOutputDefinitionsProvider();
    }

    public ConfigurationDescription getConfigurationDescription() {
        return configurationDescription;
    }

    /**
     * @return <code>true</code> if the component can technically only be
     *         executed locally, otherwise <code>false</code>
     */
    public boolean canOnlyBeExecutedLocally() {
        return componentInterface.getLocalExecutionOnly();
    }

    /**
     * @return <code>true</code> if the component should be disposed workflow
     *         disposal, <code>false</code> if immediately when the component
     *         had finished (default behavior)
     */
    public boolean performLazyDisposal() {
        return componentInterface.getPerformLazyDisposal();
    }

    public byte[] getIcon16() {
        return componentInterface.getIcon16();
    }

    public byte[] getIcon24() {
        return componentInterface.getIcon24();
    }

    public byte[] getIcon32() {
        return componentInterface.getIcon32();
    }

    /**
     * @return node to run on
     */
    public LogicalNodeId getNode() {
        if (componentInstallation.getNodeId() != null) {
            return NodeIdentifierUtils.parseArbitraryIdStringToLogicalNodeIdWithExceptionWrapping(componentInstallation.getNodeId());
        }
        return null;
    }

    /**
     * @param installation
     *            new {@link ComponentInstallation} to set
     */
    public void setComponentInstallationAndUpdateConfiguration(ComponentInstallation installation) {
        setComponentInstallation(installation);
        Map<String, String> config = configurationDescription.getConfiguration();
        Map<String, String> placeholders = configurationDescription.getPlaceholders();

        configurationDescription = new ConfigurationDescription(
                installation.getComponentInterface().getConfigurationDefinition(),
                installation.getComponentInterface().getConfigurationExtensionDefinitions());
        configurationDescription.setConfiguration(config);
        configurationDescription.setPlaceholders(placeholders);
    }

    public ComponentInstallation getComponentInstallation() {
        return componentInstallation;
    }

    /**
     * Copies the execution information of the given component description.
     * 
     * @param installation
     *            component installation with execution information to copy
     */
    public void setComponentInstallation(ComponentInstallation installation) {
        String interfaceId = componentInterface.getIdentifierAndVersion();
        String newInterfaceId = installation.getComponentInterface().getIdentifierAndVersion();
        if (!newInterfaceId.equals(interfaceId) && !(newInterfaceId.startsWith(ComponentUtils.MISSING_COMPONENT_PREFIX))
                && newInterfaceId.endsWith(interfaceId)
                && !(interfaceId.startsWith(ComponentUtils.MISSING_COMPONENT_PREFIX))
                && interfaceId.endsWith(newInterfaceId)) {
            throw new IllegalArgumentException(
                    "Component installation doesn't refer to the interface: " + componentInterface.getIdentifierAndVersion());
        }

        this.componentInstallation = installation;
        this.componentRevision = componentInstallation.getComponentRevision();
        this.componentInterface = componentRevision.getComponentInterface();
    }

    @Override
    public String toString() {
        return getNode() + ":" + componentInterface.getIdentifierAndVersion();
    }

    @Override
    public ComponentDescription clone() {
        try {
            ByteArrayOutputStream bos = new ByteArrayOutputStream();
            ObjectOutputStream oos = new ObjectOutputStream(bos);
            oos.writeObject(this);
            oos.flush();
            ByteArrayInputStream bin = new ByteArrayInputStream(bos.toByteArray());
            ObjectInputStream ois = new ObjectInputStream(bin);
            ComponentDescription cd = (ComponentDescription) ois.readObject();
            ois.close();
            bin.close();
            oos.close();
            bos.close();
            return cd;
        } catch (IOException e) {
            LogFactory.getLog(ComponentDescription.class).error("cloning component description failed", e);
            throw new RuntimeException(e);
        } catch (ClassNotFoundException e) {
            LogFactory.getLog(ComponentDescription.class).error("cloning component description failed", e);
            throw new RuntimeException(e);
        }
    }

    @Override
    public int compareTo(ComponentDescription o) {
        return this.getName().compareTo(o.getName());
    }

    public ComponentInterface getComponentInterface() {
        return componentInterface;
    }

}
