/*******************************************************************************
 * Copyright (c) 2003, 2004, 2005 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 API and implementation
 *******************************************************************************/
package org.eclipse.wst.common.componentcore.internal.builder;

import java.util.ArrayList;
import java.util.List;
import java.util.Stack;

import org.eclipse.core.internal.events.ResourceDelta;
import org.eclipse.core.resources.IProject;
import org.eclipse.core.resources.IResource;
import org.eclipse.core.resources.IncrementalProjectBuilder;
import org.eclipse.emf.common.util.EList;
import org.eclipse.wst.common.componentcore.ComponentCore;
import org.eclipse.wst.common.componentcore.UnresolveableURIException;
import org.eclipse.wst.common.componentcore.datamodel.properties.IProjectComponentsBuilderDataModelProperties;
import org.eclipse.wst.common.componentcore.datamodel.properties.IReferencedComponentBuilderDataModelProperties;
import org.eclipse.wst.common.componentcore.datamodel.properties.IWorkbenchComponentBuilderDataModelProperties;
import org.eclipse.wst.common.componentcore.internal.ComponentType;
import org.eclipse.wst.common.componentcore.internal.ReferencedComponent;
import org.eclipse.wst.common.componentcore.internal.StructureEdit;
import org.eclipse.wst.common.componentcore.internal.WorkbenchComponent;
import org.eclipse.wst.common.componentcore.internal.util.IModuleConstants;
import org.eclipse.wst.common.componentcore.resources.ComponentHandle;
import org.eclipse.wst.common.componentcore.resources.IVirtualComponent;
import org.eclipse.wst.common.componentcore.resources.IVirtualReference;
import org.eclipse.wst.common.componentcore.resources.IVirtualResource;
import org.eclipse.wst.common.frameworks.datamodel.AbstractDataModelProvider;
import org.eclipse.wst.common.frameworks.datamodel.IDataModel;
import org.eclipse.wst.common.frameworks.datamodel.IDataModelOperation;
import org.eclipse.wst.common.frameworks.internal.enablement.DataModelEnablementFactory;

public class ProjectComponentsBuilderDataModelProvider extends AbstractDataModelProvider implements IProjectComponentsBuilderDataModelProperties {

	/*
	 * (non-Javadoc)
	 * 
	 * @see org.eclipse.wst.common.frameworks.datamodel.IDataModelProvider#getPropertyNames()
	 */
	public String[] getPropertyNames() {
		return new String[]{PROJECT, BUILD_KIND, PROJECT_DETLA, CHANGED_RESOURCES_DELTA, ADDITIONAL_REFERENCED_BUILDER_DM_LIST, COMPONENT_CORE, COMPONENT_BUILDER_DM_LIST};
	}

	public void init() {
		super.init();
		model.setProperty(ADDITIONAL_REFERENCED_BUILDER_DM_LIST, new ArrayList());
		model.setIntProperty(BUILD_KIND, IncrementalProjectBuilder.FULL_BUILD);
	}

	/*
	 * (non-Javadoc)
	 * 
	 * @see org.eclipse.wst.common.frameworks.internal.operations.WTPOperationDataModel#doSetProperty(java.lang.String,
	 *      java.lang.Object)
	 */
	public boolean propertySet(String propertyName, Object propertyValue) {
		if (PROJECT.equals(propertyName)) {
			model.setProperty(COMPONENT_BUILDER_DM_LIST, populateModuleBuilderDataModelList());
			if (model.getIntProperty(BUILD_KIND) == (IncrementalProjectBuilder.INCREMENTAL_BUILD) && model.isPropertySet(CHANGED_RESOURCES_DELTA)) {
				createAdditionalBuildersIfNecessary();
			}
		}
		return true;
	}

	/**
	 * @return
	 */
	private Object populateModuleBuilderDataModelList() {
		List moduleDMList = null;
		switch (model.getIntProperty(BUILD_KIND)) {
			case IncrementalProjectBuilder.CLEAN_BUILD :
			case IncrementalProjectBuilder.FULL_BUILD :
				moduleDMList = populateFullModuleBuilderDataModelList();
				break;
			case IncrementalProjectBuilder.INCREMENTAL_BUILD :
				moduleDMList = populateDeltaModuleBuilderDataModelList((ResourceDelta) getProperty(PROJECT_DETLA));
				break;
			default :
				moduleDMList = populateFullModuleBuilderDataModelList();
				break;
		}
		return moduleDMList;
	}

	private void createAdditionalBuildersIfNecessary() {
		List deltaResources = (List) model.getProperty(CHANGED_RESOURCES_DELTA);
		IVirtualResource[] vResources = null;
		for (int i = 0; i < deltaResources.size(); i++) {
			vResources = ComponentCore.createResources((IResource) deltaResources.get(i));
			createAdditionalBuildersForVResoures(vResources);
		}
	}

	private void createAdditionalBuildersForVResoures(IVirtualResource[] resources) {
		IVirtualComponent vReferencingComponent;
		IVirtualComponent vReferencedComponent;

		ComponentHandle referencedComponentHandle;
		ComponentHandle[] referencingComponentHandles;
		for (int i = 0; i < resources.length; i++) {
			vReferencedComponent = resources[i].getComponent();
			referencedComponentHandle = ComponentHandle.create(vReferencedComponent.getProject(), vReferencedComponent.getName());
			referencingComponentHandles = DependencyGraphManager.getInstance().getDependencyGraph().getReferencingComponents(referencedComponentHandle);
			for (int j = 0; j < referencingComponentHandles.length; j++) {
				vReferencingComponent = ComponentCore.createComponent(referencingComponentHandles[j].getProject(), referencingComponentHandles[j].getName());
				createAdditionalReferencedBuilders(vReferencingComponent, vReferencedComponent);
			}
		}
	}

	private void createAdditionalReferencedBuilders(IVirtualComponent containingComponent, IVirtualComponent depComponent) {
		List depModulesDataModels = (List) model.getProperty(ADDITIONAL_REFERENCED_BUILDER_DM_LIST);
		IDataModel dependentDataModel = null;
		StructureEdit moduleCore = (StructureEdit) model.getProperty(COMPONENT_CORE);
		IProject project = (IProject) model.getProperty(PROJECT);
		dependentDataModel = DataModelEnablementFactory.createDataModel(IModuleConstants.DEPENDENT_MODULE + ".builder", project);
		if (dependentDataModel != null) {
			IVirtualReference virtualReference = ComponentCore.createReference(containingComponent, depComponent);
			dependentDataModel.setProperty(IReferencedComponentBuilderDataModelProperties.VIRTUAL_REFERENCE, virtualReference);
			depModulesDataModels.add(dependentDataModel);
		}
		model.setProperty(ADDITIONAL_REFERENCED_BUILDER_DM_LIST, depModulesDataModels);
	}

	/**
	 * Sorts the wbModules such that the returned list
	 * 
	 * @param wbModule
	 * @param sortedModuleList
	 * @param wbModuleList
	 * @return
	 * @throws UnresolveableURIException
	 */
	private List computeModuleBuildOrder(WorkbenchComponent wbModule, List sortedModuleList, List wbModuleList, Stack callStack) throws UnresolveableURIException {
		if (callStack.contains(wbModule)) {
			// TODO do something meaningful with this.
			throw new RuntimeException("Cyclical module dependency detected.");
		}
		try {
			callStack.push(wbModule);
			EList depModules = wbModule.getReferencedComponents();
			for (int i = 0; i < depModules.size(); i++) {
				ReferencedComponent depModule = (ReferencedComponent) depModules.get(i);
				if (((StructureEdit) model.getProperty(COMPONENT_CORE)).isLocalDependency(depModule)) {
					WorkbenchComponent depWBModule = ((StructureEdit) model.getProperty(COMPONENT_CORE)).findComponentByURI(depModule.getHandle());
					if (!sortedModuleList.contains(depWBModule)) {
						computeModuleBuildOrder(depWBModule, sortedModuleList, null, callStack);
					}
				}
			}
			if (!sortedModuleList.contains(wbModule)) {
				sortedModuleList.add(wbModule);
			}
			if (null != wbModuleList && !wbModuleList.isEmpty()) {
				wbModule = (WorkbenchComponent) wbModuleList.remove(wbModuleList.size() - 1);
				return computeModuleBuildOrder(wbModule, sortedModuleList, wbModuleList, callStack);
			}
			return sortedModuleList;
		} finally {
			callStack.pop();
		}
	}

	/**
	 * Returns the list of WorkbenchModules in a sorted build order
	 * 
	 * @param wbModules
	 * @return
	 */
	private List computeModuleBuildOrder(WorkbenchComponent[] wbModules) {
		ArrayList unsortedList = new ArrayList(wbModules.length - 1);
		for (int i = 1; i < wbModules.length; i++) {
			unsortedList.add(wbModules[i]);
		}
		WorkbenchComponent firstModule = wbModules[0];
		if (firstModule == null)
			return null;
		List sortedList = new ArrayList(wbModules.length);
		try {
			sortedList = computeModuleBuildOrder(firstModule, sortedList, unsortedList, new Stack());
			// for(int i=0;i<sortedList.size(); i++){
			// System.out.println(sortedList.get(i));
			// }
		} catch (UnresolveableURIException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		return sortedList;
	}


	private List populateFullModuleBuilderDataModelList() {
		StructureEdit moduleCore = (StructureEdit) model.getProperty(COMPONENT_CORE);
		List moduleBuilderDataModelList = new ArrayList();
		WorkbenchComponent[] wbModules = moduleCore.getWorkbenchModules();

		if (wbModules == null || wbModules.length == 0) {
			return null;
		}

		List sortedList = computeModuleBuildOrder(wbModules);
		if (sortedList == null)
			return moduleBuilderDataModelList;
		IDataModel dataModel = null;
		IProject curProject = (IProject) model.getProperty(PROJECT);

		String builderType = null;
		for (int i = 0; i < sortedList.size(); i++) {
			WorkbenchComponent wbComponent = (WorkbenchComponent) sortedList.get(i);
			ComponentType type = wbComponent.getComponentType();
			if (type == null)
				continue;
			String typeId = type.getComponentTypeId();
			if (typeId == null)
				continue;
			builderType = typeId + ".builder";
			dataModel = DataModelEnablementFactory.createDataModel(builderType, curProject);
			if (dataModel != null) {
				IVirtualComponent vComponent = ComponentCore.createComponent(curProject, wbComponent.getName());
				dataModel.setProperty(IWorkbenchComponentBuilderDataModelProperties.BUILD_KIND_FOR_DEP, model.getProperty(BUILD_KIND));
				dataModel.setProperty(IWorkbenchComponentBuilderDataModelProperties.VIRTUAL_COMPONENT, vComponent);
				moduleBuilderDataModelList.add(dataModel);
			}
		}
		return moduleBuilderDataModelList;
	}

	private List populateDeltaModuleBuilderDataModelList(ResourceDelta delta) {
		// TODO: handle delta information correcty
		return populateFullModuleBuilderDataModelList();
	}

	/*
	 * (non-Javadoc)
	 * 
	 * @see org.eclipse.wst.common.frameworks.internal.operations.WTPOperationDataModel#getDefaultOperation()
	 */
	public IDataModelOperation getDefaultOperation() {
		return new ProjectComponentsBuilderOperation(model);
	}

}