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/***************************************************************************
 * Copyright 2022 Kieker Project (http://kieker-monitoring.net)
 *
 * 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 kieker.visualization.trace.dependency.graph;

import kieker.model.system.model.AllocationComponent;
import kieker.model.system.model.AssemblyComponent;
import kieker.model.system.model.ExecutionContainer;
import kieker.model.system.model.Operation;
import kieker.tools.trace.analysis.filter.visualization.AbstractGraphFormatter;
import kieker.tools.trace.analysis.filter.visualization.util.dot.DotFactory;

/**
 * Abstract superclass for all dependency-graph formatters.
 *
 * @author Holger Knoche
 *
 * @param 
 *            The graph type this formatter is for
 *
 * @since 1.6
 */
public abstract class AbstractDependencyGraphFormatter> extends AbstractGraphFormatter {

	/** The string used in the node labels for execution containers. */
	protected static final String STEREOTYPE_EXECUTION_CONTAINER = "<>";
	/** The string used in the node labels for assembly components. */
	protected static final String STEREOTYPE_ASSEMBLY_COMPONENT = "<>";
	/** The string used in the node labels for deployment components. */
	protected static final String STEREOTYPE_ALLOCATION_COMPONENT = "<>";

	private static final String NODE_ID_PREFIX = "depNode_";
	private static final String CONTAINER_NODE_ID_PREFIX = "container";
	private static final String COMPONENT_NODE_ID_PREFIX = "component_";

	@Override
	protected String formatGraph(final G graph, final boolean includeWeights, final boolean useShortLabels, final boolean plotLoops) {
		return this.formatDependencyGraph(graph, includeWeights, useShortLabels, plotLoops);
	}

	/**
	 * Outputs the default graph header to the given builder.
	 *
	 * @param builder
	 *            The builder to use
	 */
	protected void appendGraphHeader(final StringBuilder builder) {
		builder.append("digraph G {\n rankdir=" + DotFactory.DOT_DOT_RANKDIR_LR + ";\n");
	}

	/**
	 * Outputs the default graph footer to the given builder.
	 *
	 * @param builder
	 *            The builder to use
	 */
	protected void appendGraphFooter(final StringBuilder builder) {
		builder.append("}\n");
	}

	/**
	 * Utility function to create a textual container ID for an execution container.
	 *
	 * @param container
	 *            The container to create the ID for
	 * @return The created ID
	 */
	protected static String createContainerId(final ExecutionContainer container) {
		return CONTAINER_NODE_ID_PREFIX + container.getId();
	}

	/**
	 * Utility function to create a textual container ID for an allocation component.
	 *
	 * @param component
	 *            The allocation component to create the ID for
	 * @return The created ID
	 */
	protected static String createAllocationComponentId(final AllocationComponent component) {
		return COMPONENT_NODE_ID_PREFIX + component.getId();
	}

	/**
	 * Utility function to create a textual container ID for an assembly component.
	 *
	 * @param component
	 *            The assembly component to create the ID for
	 * @return The created ID
	 */
	protected static String createAssemblyComponentId(final AssemblyComponent component) {
		return COMPONENT_NODE_ID_PREFIX + component.getId();
	}

	/**
	 * Utility function to create a textual node ID for an operation.
	 *
	 * @param operation
	 *            The operation to create the ID for
	 * @return The created ID
	 */
	protected static String createOperationNodeId(final Operation operation) {
		return AbstractDependencyGraphFormatter.createNodeId(operation.getId());
	}

	/**
	 * Utility function to create a textual node ID from a given numeric node ID.
	 *
	 * @param nodeId
	 *            The numeric node ID
	 * @return The created ID
	 */
	protected static String createNodeId(final int nodeId) {
		return NODE_ID_PREFIX + nodeId;
	}

	/**
	 * Utility function to create a textual node ID for a given node.
	 *
	 * @param node
	 *            The node to create the ID for
	 * @return The created ID
	 */
	protected static String createNodeId(final DependencyGraphNode node) {
		return AbstractDependencyGraphFormatter.createNodeId(node.getId());
	}

	/**
	 * Utility function to determine the fill color to use for a given node.
	 *
	 * @param node
	 *            The node to determine the color for
	 * @return The color name to use for the given node
	 */
	protected static String getNodeFillColor(final DependencyGraphNode node) {
		if (node.isAssumed()) {
			return DotFactory.DOT_FILLCOLOR_GRAY;
		} else {
			return DotFactory.DOT_FILLCOLOR_WHITE;
		}
	}

	/**
	 * The inheriting classes should implement this method to encapsulate the concrete graph formatting.
	 *
	 * @param graph
	 *            The input graph to format
	 * @param includeWeights
	 *            Determines whether to include weights or not.
	 * @param useShortLabels
	 *            Determines whether to use short labels or not.
	 * @param plotLoops
	 *            Determines whether to plot loops or not.
	 *
	 * @return
	 *         A textual specification of the input graph
	 */
	protected abstract String formatDependencyGraph(G graph, boolean includeWeights, boolean useShortLabels, boolean plotLoops);
}