//------------------------------------------------------------------------------
// Copyright (c) 2005, 2006 IBM Corporation and others.
// All rights reserved. This program and the accompanying materials
// are made available under the terms of the Eclipse Public License v1.0
// which accompanies this distribution, and is available at
// http://www.eclipse.org/legal/epl-v10.html
//
// Contributors:
// IBM Corporation - initial implementation
//------------------------------------------------------------------------------
package org.eclipse.epf.library.layout.elements;

import java.util.ArrayList;
import java.util.Collection;
import java.util.Collections;
import java.util.Comparator;
import java.util.HashSet;
import java.util.List;
import java.util.Map;
import java.util.Set;

import org.eclipse.emf.ecore.EStructuralFeature;
import org.eclipse.epf.library.edit.PresentationContext;
import org.eclipse.epf.library.edit.configuration.PracticeItemProvider;
import org.eclipse.epf.library.edit.configuration.PracticeItemProvider.GroupingHelper;
import org.eclipse.epf.library.edit.util.CategorySortHelper;
import org.eclipse.epf.library.layout.ElementLayoutManager;
import org.eclipse.epf.library.layout.util.XmlElement;
import org.eclipse.epf.uma.MethodElement;
import org.eclipse.epf.uma.Task;
import org.eclipse.epf.uma.UmaPackage;
import org.eclipse.epf.uma.WorkProduct;
import org.eclipse.epf.uma.ecore.util.OppositeFeature;
import org.eclipse.epf.uma.util.AssociationHelper;


/**
 * The element layout for a Practice
 * 
 * @author Weiping Lu
 * @since 1.5
 */
public class PracticeLayout extends AbstractElementLayout {

	public PracticeLayout() {
		super();
	}

	public void init(ElementLayoutManager layoutManager, MethodElement element) {
		super.__init(layoutManager, element);
	}

	/**
	 * @see org.eclipse.epf.library.layout.IElementLayout#getXmlElement(boolean)
	 */
	public XmlElement getXmlElement(boolean includeReferences) {
		XmlElement elementXml = super.getXmlElement(includeReferences);

		if (includeReferences) {
			EStructuralFeature feature = UmaPackage.Literals.PRACTICE__CONTENT_REFERENCES;
			List<MethodElement> children = calc0nFeatureValue(element, null,
					feature, layoutManager.getElementRealizer());
			
			List<WorkProduct> wpSlotInputs = getInputWpSlots(children);
			
			EStructuralFeature feature1 = UmaPackage.Literals.PRACTICE__ACTIVITY_REFERENCES;
			List<MethodElement> children1 = calc0nFeatureValue(element, null,
					feature1, layoutManager.getElementRealizer());
			
			EStructuralFeature feature2 = UmaPackage.Literals.PRACTICE__SUB_PRACTICES;
			List<MethodElement> children2 = calc0nFeatureValue(element, null,
					feature2, layoutManager.getElementRealizer());
			
			children.addAll(children1);
			children.addAll(children2);
			
			List ret = new ArrayList();

			GroupingHelper groupingHelper = new GroupingHelper(this) {			
				protected void grouping(Object parentObject, List ret,
						Collection children, GroupingHelper groupingHelper) {					
					if (getGrouper() instanceof PracticeLayout) {
						((PracticeLayout) getGrouper()).grouping(parentObject, ret,
								children, groupingHelper);
					}
				}	
			};
			
			grouping(this, ret, children, groupingHelper);
					
			addReferences(feature,
					elementXml, "Practice guidance tree", ret); //$NON-NLS-1$
			
			if (wpSlotInputs != null) {
				addReferences(feature,
					elementXml, "Input work product slots", wpSlotInputs); //$NON-NLS-1$
			}

		}

		return elementXml;
	}

	private List<WorkProduct> getInputWpSlots(List<MethodElement> elements) {
		Set<WorkProduct> slots = new HashSet<WorkProduct>();
		for (MethodElement elem: elements) {
			if (elem instanceof Task) {
				Task task = (Task) elem;
				for (WorkProduct wp: task.getMandatoryInput()) {
					if (wp.getIsAbstract()) {
						slots.add(wp);
					}
				}
				for (WorkProduct wp: task.getOptionalInput()) {
					if (wp.getIsAbstract()) {
						slots.add(wp);
					}
				}
			}
		}
		if (slots.isEmpty()) {
			return null;
		}

		List<WorkProduct> wpSlotInputs = new ArrayList<WorkProduct>();
		wpSlotInputs.addAll(slots);
		
		if (wpSlotInputs.size() > 1) {
			Comparator comparator = PresentationContext.INSTANCE.getPresNameComparator();
			Collections.<WorkProduct>sort(wpSlotInputs, comparator);
		}
		
		return wpSlotInputs;
	}
	
	protected boolean acceptFeatureValue(EStructuralFeature feature, Object value) {
		if (feature.isMany()) {
			//return false;
		}
		return super.acceptFeatureValue(feature, value);
	}

	private void grouping(Object parentObject, List ret, Collection children, 
			PracticeItemProvider.GroupingHelper groupingHelper) {
		Map<String, List> map = PracticeItemProvider.getSubGroupMap(children, groupingHelper);
		
		boolean toSort = true;
		if (parentObject instanceof PracticeLayout) {
			MethodElement elem = ((PracticeLayout) parentObject).element;
			if (elem != null) {
				toSort = ! CategorySortHelper.isManualCategorySort(elem);
			}
		}
		String[] keys = groupingHelper.getKeysInOrder();
		for (int i = 0; i < keys.length; i++) {
			String key = keys[i];
			List subgroupChildren = map.get(key);
			if (subgroupChildren == null || subgroupChildren.isEmpty()) {
				continue;
			}
			if (groupingHelper.toGroup(key, subgroupChildren)) {
				subgroupChildren = groupingHelper.nestedGrouping(parentObject, key, subgroupChildren);
				SubGroupValue subGroupValue = new SubGroupValue(key, subgroupChildren);
				ret.add(subGroupValue);
			} else {
				if (toSort) {
					PracticeItemProvider.sort(subgroupChildren);
				}
				ret.addAll(subgroupChildren);
			}
		}
	}
	
	protected void processNonMethodElementInProcessChild(
			Object nonMethodElementChild, Object feature, XmlElement parent,
			boolean includeReferences) {
		
		if (nonMethodElementChild instanceof SubGroupValue) {
			SubGroupValue subGroupValue = (SubGroupValue) nonMethodElementChild;
			String key = subGroupValue.key;
			List listValue = subGroupValue.listValue;
			addReferences(feature,
				parent, key, listValue); 
		}
	}
	
	protected boolean acceptFeatureValue(OppositeFeature feature, Object value) {
/*		if ( feature == AssociationHelper.DescribableElement_CustomCategories) {
			return true;
		}*/			
		return super.acceptFeatureValue(feature, value);
	}

	static class SubGroupValue {
		public String key;
		public List listValue;
		
		public SubGroupValue(String key, List listValue) {
			this.key = key;
			this.listValue = listValue;
		}
	}

	
}