package org.simantics.plant3d.property;

import java.util.ArrayList;
import java.util.Collection;
import java.util.List;
import java.util.function.Consumer;

import org.eclipse.jface.viewers.ISelection;
import org.eclipse.swt.widgets.Composite;
import org.eclipse.ui.IWorkbenchSite;
import org.simantics.Simantics;
import org.simantics.browsing.ui.swt.PartNameListener;
import org.simantics.browsing.ui.swt.widgets.impl.WidgetSupport;
import org.simantics.db.ReadGraph;
import org.simantics.db.Resource;
import org.simantics.db.common.utils.NameUtils;
import org.simantics.db.exception.DatabaseException;
import org.simantics.db.management.ISessionContext;
import org.simantics.db.request.Read;
import org.simantics.g3d.property.PropertyTabContributor;
import org.simantics.g3d.property.PropertyTabUtil;
import org.simantics.g3d.scenegraph.base.INode;
import org.simantics.g3d.tools.AdaptationUtils;
import org.simantics.g3d.vtk.property.VTKPropertyTabContributor;
import org.simantics.objmap.structural.StructuralResource;
import org.simantics.selectionview.BasicPropertyTab;
import org.simantics.selectionview.ComparableTabContributor;
import org.simantics.selectionview.PropertyTabContributorImpl;
import org.simantics.selectionview.SelectionProcessor;
import org.simantics.utils.threads.SWTThread;

import vtk.vtkProp;

public class P3DSelectionProcessor implements SelectionProcessor<Object, ReadGraph>  {
	
	private static final boolean DEBUG = false;
	@Override
	public Collection<?> process(Object selection, ReadGraph backend) {
//	     System.out.println(getClass().getSimpleName() + " incoming selection: " + ObjectUtils.toString(selection));


		Collection<ComparableTabContributor> result = new ArrayList<ComparableTabContributor>();
		Collection<Resource> resourceCollection = AdaptationUtils.adaptToCollection(selection, Resource.class);
		Collection<StructuralResource> structuralResourceCollection = AdaptationUtils.adaptToCollection(selection, StructuralResource.class);
		Collection<vtkProp> propCollection = AdaptationUtils.adaptToCollection(selection, vtkProp.class);
		Collection<INode> nodeCollection = AdaptationUtils.adaptToCollection(selection, INode.class);
		boolean readOnly = false;
		if (resourceCollection.size() == 0 && structuralResourceCollection.size() > 0) {
			for (StructuralResource sr : structuralResourceCollection) {
				if (sr.isStructural() && !sr.isStructuralRoot())
					readOnly = true;
				resourceCollection.add(sr.getResource());
			}
		}


		if (nodeCollection.size() == 1) {
			INode node = nodeCollection.iterator().next();
			List<PropertyTabContributor> contributors = PropertyTabUtil.getContributors(node);
			int i = 100;
			for (PropertyTabContributor c : contributors) {
				result.add(new ComparableTabContributor(c, i--, node, c.getId()));
			}
		}

		if (DEBUG) {
			if (propCollection.size() == 1) {
				vtkProp prop = propCollection.iterator().next();
				if (prop == null)
					throw new NullPointerException();
				result.add(new ComparableTabContributor(new VTKPropertyTabContributor(SWTThread.getThreadAccess()), -2, prop, "VTK"));
			}
			
			if (resourceCollection.size() > 0) {
				if (resourceCollection.size() > 1)
					result.add(new ComparableTabContributor(new MultiSelectionTabContibutor(),0, resourceCollection, "Graph"));
				else if (resourceCollection.size() == 1){
					try {
						Resource r = resourceCollection.iterator().next();
						result.add(new ComparableTabContributor(new P3DBasicPropertyTab(!readOnly), 0, r, "Graph"));

					} catch (Exception e) {
						e.printStackTrace();
					}
				}
			}
		}

		if (resourceCollection.size() == 1){
			try {
				Resource r = resourceCollection.iterator().next();
				result.add(new ComparableTabContributor(new P3DBasicPropertyTab(!readOnly), 0, r, "Properties"));
			} catch (Exception e) {
				e.printStackTrace();
			}
		}
		
		if(result.size() == 0) {
			result.add(new ComparableTabContributor(new NoneSelectionTabContributor(),0, resourceCollection, "Empty"));
		}

		return result;
	}

	public class P3DBasicPropertyTab extends BasicPropertyTab {

		boolean enabled;
		public P3DBasicPropertyTab(boolean enabled) {
			this.enabled = enabled;
		}
		
		

		@Override
		public void updatePartName(ISelection forSelection, Consumer<String> updateCallback) {
			Read<String> read = getPartNameReadRequest(forSelection);
			if (read == null) {
				updateCallback.accept("Override to control part name (PropertyTabContributorImpl.updatePartName)");
			} else {
				Simantics.getSession().asyncRequest(read, new PartNameListener(updateCallback));
			}
		}

		@Override
		public Read<String> getPartNameReadRequest(ISelection forSelection) {
			final Resource r  =  AdaptationUtils.adaptToSingle(forSelection, Resource.class);
			if (r == null)
				return null;
			return new Read<String>() {
				@Override
				public String perform(ReadGraph graph) throws DatabaseException {
					return NameUtils.getSafeName(graph, r);		
				}
			};
		}

		@Override
		public void createControls(Composite body, IWorkbenchSite site,
				ISessionContext context, WidgetSupport support) {
			// TODO Auto-generated method stub
			super.createControls(body, site, context, support);
			((Composite)parameterExplorer.getExplorerControl()).setEnabled(enabled);
		}
	}



	public class MultiSelectionTabContibutor extends PropertyTabContributorImpl {
		@Override
		public void createControls(org.eclipse.swt.widgets.Composite body, org.eclipse.ui.IWorkbenchSite site, org.simantics.db.management.ISessionContext context, org.simantics.browsing.ui.swt.widgets.impl.WidgetSupport support) {
			//Composite composite = new Composite(body, SWT.NONE);
		}

		@Override
		public Read<String> getPartNameReadRequest(ISelection forSelection) {
			final Collection<Resource> coll =  AdaptationUtils.adaptToCollection(forSelection, Resource.class);
			if (coll.size() == 0)
				return null;
			return new Read<String>() {
				@Override
				public String perform(ReadGraph graph) throws DatabaseException {
					String title = "";
					for (Resource r : coll) {
						title += NameUtils.getSafeName(graph, r) +",";
					}
					System.out.println(title);
					return title.substring(0,title.length()-1);		
				}
			};
		}
	}

	public class NoneSelectionTabContributor extends PropertyTabContributorImpl {
		@Override
		public void createControls(Composite body, IWorkbenchSite site,
				ISessionContext context, WidgetSupport support) {
			//Composite composite = new Composite(body, SWT.NONE);

		}

		//@Override
		public void updatePartName(ISelection forSelection, Consumer<String> updateCallback) {
			updateCallback.accept("No Selection");
		}
	}


}