/*******************************************************************************
 * Copyright (c) 2007, 2008 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.validation.internal;

import org.eclipse.core.resources.IProject;
import org.eclipse.core.resources.IResource;
import org.eclipse.core.resources.IResourceDelta;
import org.eclipse.core.resources.IResourceDeltaVisitor;
import org.eclipse.core.resources.IResourceProxy;
import org.eclipse.core.resources.IResourceProxyVisitor;
import org.eclipse.core.resources.IResourceVisitor;
import org.eclipse.core.resources.ResourcesPlugin;
import org.eclipse.core.resources.WorkspaceJob;
import org.eclipse.core.runtime.CoreException;
import org.eclipse.core.runtime.IProgressMonitor;
import org.eclipse.core.runtime.IStatus;
import org.eclipse.core.runtime.Status;
import org.eclipse.core.runtime.SubMonitor;
import org.eclipse.wst.validation.DependentResource;
import org.eclipse.wst.validation.Friend;
import org.eclipse.wst.validation.IDependencyIndex;
import org.eclipse.wst.validation.ValidationFramework;
import org.eclipse.wst.validation.ValidationState;
import org.eclipse.wst.validation.internal.operations.ValidationBuilder;
import org.eclipse.wst.validation.internal.plugin.ValidationPlugin;


/**
 * Run all the v2 validators through this job.
 * <p>
 * This is the main class for supporting build based validation. When triggered it looks at all of the
 * resource changes and determines what needs to be validated. 
 * @author karasiuk
 *
 */
public class ValBuilderJob extends WorkspaceJob implements IResourceDeltaVisitor, IResourceVisitor {
	
	/** The project that is being built. */
	private IProject 			_project;
	
	/** The resource delta that triggered the build, it will be null for a full build. */
	private IResourceDelta		_delta;
	
	private ValOperation		_operation;
	
	/** 
	 * The kind of build.
	 * 
	 *  @see org.eclipse.core.resources.IncrementalProjectBuilder
	 */
	private int					_buildKind;
	
	/** The monitor to use while running the build. */
	private IProgressMonitor	_monitor;
	
	private SubMonitor			_subMonitor;
	
	/** The types of changes we are interested in. */
	private final static int	InterestedFlags = IResourceDelta.CONTENT | IResourceDelta.ENCODING |
		IResourceDelta.MOVED_FROM | IResourceDelta.MOVED_TO;
	
	/**
	 * Each validation run is done in it's own job.
	 * 
	 * @param project the project that is being validated
	 * @param delta the delta that is being validated. This may be null, in which case we do a 
	 * full validation of the project.
	 * 
	 * @param buildKind the kind of build.
	 * @see org.eclipse.core.resources.IncrementalProjectBuilder#AUTO_BUILD
	 * @see org.eclipse.core.resources.IncrementalProjectBuilder#CLEAN_BUILD
	 * @see org.eclipse.core.resources.IncrementalProjectBuilder#FULL_BUILD
	 * @see org.eclipse.core.resources.IncrementalProjectBuilder#INCREMENTAL_BUILD
	 * 
	 * @param operation some global context for the validation operation
	 * 
	 */
	public ValBuilderJob(IProject project, IResourceDelta delta, int buildKind, ValOperation operation){
		super(ValMessages.JobName);
		_project = project;
		_delta = delta;
		_buildKind = buildKind;
		_operation = operation;
	}
	
	public boolean belongsTo(Object family) {
		if (family == ResourcesPlugin.FAMILY_MANUAL_BUILD)return true;
		if (family == ValidationBuilder.FAMILY_VALIDATION_JOB){
			return true;
		}
			
		return super.belongsTo(family);
	}

	public IStatus runInWorkspace(IProgressMonitor monitor) {
		Tracing.log("ValBuilderJob-01: Starting"); //$NON-NLS-1$
		_monitor = monitor;
		
		try {		
			if (_delta == null)fullBuild();
			else deltaBuild();
			
		}
		catch (ProjectUnavailableError e){
			ValidationPlugin.getPlugin().handleProjectUnavailableError(e);
		}
		catch (ResourceUnavailableError e){
			ValidationPlugin.getPlugin().handleResourceUnavailableError(e);
		}
		catch (CoreException e){
			ValidationPlugin.getPlugin().handleException(e);
		}
		
		Tracing.log("ValBuilderJob-02: Finished"); //$NON-NLS-1$
		return Status.OK_STATUS;
	}

	private void deltaBuild() throws CoreException {
		ResourceCounter counter = new ResourceCounter();
		_delta.accept(counter);
		_subMonitor = SubMonitor.convert(_monitor, counter.getCount());
		_delta.accept(this);		
	}

	private void fullBuild() throws CoreException {
		ResourceCounter counter = new ResourceCounter();
		_project.accept(counter, 0);
		_subMonitor = SubMonitor.convert(_monitor, counter.getCount());
		_project.accept(this);
		
	}

	public boolean visit(IResourceDelta delta) throws CoreException {
		IResource resource = delta.getResource();
		if (DisabledResourceManager.getDefault().isDisabled(resource)){
			MarkerManager.getDefault().deleteMarkers(resource, _operation.getStarted(), IResource.DEPTH_INFINITE);
			return false;
		}
		int kind = delta.getKind();
		boolean isChanged = (kind & IResourceDelta.CHANGED) != 0;
		if (isChanged &&  (delta.getFlags() & InterestedFlags) == 0)return true;
		
		if ((kind & (IResourceDelta.ADDED | IResourceDelta.CHANGED)) != 0){
			ValManager.getDefault().validate(_project, resource, delta.getKind(), ValType.Build, _buildKind, 
				_operation, _subMonitor.newChild(1));
		}
				
		IDependencyIndex index = ValidationFramework.getDefault().getDependencyIndex();
		if (index.isDependedOn(resource)){
			MarkerManager mm = MarkerManager.getDefault();
			for (DependentResource dr : index.get(resource)){
				if (Friend.shouldValidate(dr.getValidator(), dr.getResource(), ValType.Build, new ContentTypeWrapper())){
					mm.clearMarker(dr.getResource(), dr.getValidator()); 
					_operation.getState().put(ValidationState.TriggerResource, resource);
					ValManager.getDefault().validate(dr.getValidator(), _operation, dr.getResource(), 
						IResourceDelta.NO_CHANGE, _monitor);
				}
			}
		}
				
		return true;
	}

	public boolean visit(IResource resource) throws CoreException {
		try {
			if (DisabledResourceManager.getDefault().isDisabled(resource)){
				MarkerManager.getDefault().deleteMarkers(resource, _operation.getStarted(), IResource.DEPTH_INFINITE);
				return false;
			}
			ValManager.getDefault().validate(_project, resource, IResourceDelta.NO_CHANGE, ValType.Build, 
				_buildKind, _operation, _subMonitor.newChild(1));
		}
		catch (ResourceUnavailableError e){
			if (Tracing.isLogging())Tracing.log("ValBuilderJob-02: " + e.toString()); //$NON-NLS-1$
			return false;
		}
		return true;
	}
	
	static class ResourceCounter implements IResourceProxyVisitor, IResourceDeltaVisitor {
		
		private int _count;

		public int getCount() {
			return _count;
		}

		public boolean visit(IResourceProxy proxy) throws CoreException {
			_count++;
			return true;
		}

		public boolean visit(IResourceDelta delta) throws CoreException {
			_count++;
			return true;
		}
		
	}

}