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.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.wst.validation.DependentResource;
import org.eclipse.wst.validation.IDependencyIndex;
import org.eclipse.wst.validation.ValidationFramework;
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;
	
	/** 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) {
		_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);
		}
		
		return Status.OK_STATUS;
	}

	private void deltaBuild() throws CoreException {
		_delta.accept(this);		
	}

	private void fullBuild() throws CoreException {
		_project.accept(this);
		
	}

	public boolean visit(IResourceDelta delta) throws CoreException {
		int kind = delta.getKind();
		if ((delta.getFlags() & InterestedFlags) == 0)return true;
		
		IResource resource = delta.getResource();
		if ((kind & (IResourceDelta.ADDED | IResourceDelta.CHANGED)) != 0){
			ValManager.getDefault().validate(_project, resource, delta.getKind(), false, true, _buildKind, 
				_operation, _monitor);
		} else if ((kind & IResourceDelta.REMOVED) != 0){
			IDependencyIndex index = ValidationFramework.getDefault().getDependencyIndex();
			if (index.isDependedOn(resource)){
				for (DependentResource dr : index.get(resource)){
					if (dr.getValidator().shouldValidate(dr.getResource(), false, true)){
						ValManager.getDefault().validate(dr.getValidator(), _operation, dr.getResource(), 
								IResourceDelta.CHANGED, _monitor);
					}
				}
			}
		}
		return true;
	}

	public boolean visit(IResource resource) throws CoreException {
		try {
			ValManager.getDefault().validate(_project, resource, IResourceDelta.NO_CHANGE, false, 
					true, _buildKind, _operation, _monitor);
		}
		catch (ResourceUnavailableError e){
			if (Tracing.isLogging())Tracing.log(e.toString());
			return false;
		}
		return true;
	}

}