/*******************************************************************************
 *******************************************************************************/
package at.gv.egiz.eaaf.core.impl.idp.process.model;

import java.util.LinkedHashMap;
import java.util.Map;
import java.util.Objects;

import at.gv.egiz.eaaf.core.impl.idp.process.ProcessDefinitionParser;

/**
 * Represents a single process definition containing
 * <ul>
 * <li>a {@link StartEvent},</li>
 * <li>one or more {@linkplain TaskInfo Tasks},</li>
 * <li>one or more {@linkplain EndEvent EndEvents} and</li>
 * <li>some {@linkplain Transition Transitions} linking StartEvents, Tasks and EndEvents.
 * </ul>
 * 
 * @author tknall
 * 
 */
public class ProcessDefinition {

	private String id;
	private StartEvent startEvent;
	private Map<String, TaskInfo> taskInfos = new LinkedHashMap<>();
	private Map<String, EndEvent> endEvents = new LinkedHashMap<>();

	/**
	 * Returns the unique identifier of the process definition.
	 * 
	 * @return The unique identifier (never {@code null} if process definition comes from
	 *         {@link ProcessDefinitionParser}).
	 */
	public String getId() {
		return id;
	}

	/**
	 * Sets the unique identifier of the process definition.
	 * 
	 * @param id
	 *            The unique identifier.
	 */
	public void setId(String id) {
		this.id = id;
	}

	/**
	 * Returns the start event of the process definition.
	 * 
	 * @return The start event (never {@code null} if process definition comes from {@link ProcessDefinitionParser}).
	 */
	public StartEvent getStartEvent() {
		return startEvent;
	}

	/**
	 * Sets the start event of the process definition.
	 * 
	 * @param startEvent
	 *            The start event.
	 */
	public void setStartEvent(StartEvent startEvent) {
		this.startEvent = startEvent;
	}

	/**
	 * Returns a map containing the tasks of the process definition.
	 * 
	 * @return The tasks (map is never {@code null} if process definition comes from {@link ProcessDefinitionParser}).
	 */
	public Map<String, TaskInfo> getTaskInfos() {
		return taskInfos;
	}

	/**
	 * Sets the map containing the tasks.
	 * 
	 * @param taskInfos
	 *            The map containing the tasks.
	 */
	public void setTaskInfos(Map<String, TaskInfo> taskInfos) {
		this.taskInfos = taskInfos;
	}

	/**
	 * Returns a map containing the end events of the process description.
	 * 
	 * @return The map containing the end events (map is never {@code null} if process definition comes from
	 *         {@link ProcessDefinitionParser}).
	 */
	public Map<String, EndEvent> getEndEvents() {
		return endEvents;
	}

	/**
	 * Sets a map containing the end events of the process description.
	 * 
	 * @param endEvents
	 *            The map containing the end events.
	 */
	public void setEndEvents(Map<String, EndEvent> endEvents) {
		this.endEvents = endEvents;
	}

	/**
	 * Returns the process node associated with the given {@code id}.
	 * 
	 * @param id
	 *            The identifier of the process node.
	 * @return The process node (may be {code null} when no process node with the given {@code id} exists).
	 */
	public ProcessNode getProcessNode(String id) {
		Objects.requireNonNull(id, "Identifier must not be null.");
		if (startEvent != null && id.equals(startEvent.getId())) {
			return startEvent;
		}
		TaskInfo task = taskInfos.get(id);
		if (task != null) {
			return task;
		}
		return endEvents.get(id);
	}

	@Override
	public String toString() {
		StringBuilder builder = new StringBuilder();
		if (id != null) {
			builder.append("id=");
			builder.append(id);
		}
		if (startEvent != null) {
			if (builder.length() > 0) {
				builder.append(", ");
			}
			builder.append("startEvent=");
			builder.append(startEvent);
		}
		if (taskInfos != null && !taskInfos.isEmpty()) {
			if (builder.length() > 0) {
				builder.append(", ");
			}
			builder.append("tasksInfos=");
			builder.append(taskInfos.values());
		}
		if (endEvents != null && !endEvents.isEmpty()) {
			if (builder.length() > 0) {
				builder.append(", ");
			}
			builder.append("endEvents=");
			builder.append(endEvents.values());
		}
		builder.insert(0, "ProcessDefinition [");
		builder.append("]");
		return builder.toString();
	}

}