package xyz.veronie.bgg.ui.parts;

import java.util.List;

import javax.annotation.PostConstruct;
import javax.inject.Inject;

import org.eclipse.e4.core.di.annotations.Optional;
import org.eclipse.e4.core.services.events.IEventBroker;
import org.eclipse.e4.ui.di.UIEventTopic;
import org.eclipse.jface.viewers.ArrayContentProvider;
import org.eclipse.jface.viewers.ColumnLabelProvider;
import org.eclipse.jface.viewers.ISelectionChangedListener;
import org.eclipse.jface.viewers.IStructuredSelection;
import org.eclipse.jface.viewers.OwnerDrawLabelProvider;
import org.eclipse.jface.viewers.SelectionChangedEvent;
import org.eclipse.jface.viewers.TableViewer;
import org.eclipse.jface.viewers.TableViewerColumn;
import org.eclipse.swt.SWT;
import org.eclipse.swt.graphics.Image;
import org.eclipse.swt.graphics.Rectangle;
import org.eclipse.swt.layout.GridData;
import org.eclipse.swt.layout.GridLayout;
import org.eclipse.swt.widgets.Composite;
import org.eclipse.swt.widgets.Event;
import org.eclipse.swt.widgets.Label;
import org.eclipse.swt.widgets.Table;
import org.eclipse.swt.widgets.TableColumn;
import org.eclipse.swt.widgets.TableItem;


import xyz.veronie.bgg.result.Thing;
import xyz.veronie.bgg.result.ThingProvider;
import xyz.veronie.bgg.types.EventConstants;


public class BggResultPart {
	private TableViewer viewer;
	private Label statsLabel;
	
	@Inject
	private ThingProvider thingProvider;
	
	@Inject 
	private IEventBroker eventBroker;
	
	@PostConstruct
	public void createContents(Composite parent) {
		Composite main = new Composite(parent, SWT.FILL);
		main.setLayoutData(new GridData(SWT.FILL, SWT.FILL, false, false));

		GridLayout layout = new GridLayout(2, false);
		main.setLayout(layout);
		
		createViewer(main);
		
		statsLabel = new Label(main, SWT.FILL);
		statsLabel.setLayoutData(new GridData(SWT.FILL, SWT.FILL, true, false));
		statsLabel.setText("0 items");
	}
	
	
    private void createViewer(Composite parent) {
        viewer = new TableViewer(parent, SWT.MULTI | SWT.H_SCROLL
                | SWT.V_SCROLL | SWT.FULL_SELECTION | SWT.BORDER );
        createColumns(parent, viewer);
        final Table table = viewer.getTable();
        table.setHeaderVisible(true);
        table.setLinesVisible(true);

        viewer.setContentProvider(new ArrayContentProvider());
        // Get the content for the viewer, setInput will call getElements in the
        // contentProvider
        viewer.setInput(thingProvider.getThings());
        // make the selection available to other views
        // TODO: getSite().setSelectionProvider(viewer);
        // Set the sorter for the table

        // Layout the viewer
        GridData gridData = new GridData();
        gridData.verticalAlignment = GridData.FILL;
        gridData.grabExcessHorizontalSpace = true;
        gridData.grabExcessVerticalSpace = true;
        gridData.horizontalAlignment = GridData.FILL;
        gridData.horizontalSpan = 2;
        viewer.getControl().setLayoutData(gridData);
        
        viewer.addSelectionChangedListener(new ISelectionChangedListener() {
            @Override
            public void selectionChanged(SelectionChangedEvent event) {
                IStructuredSelection selection = viewer.getStructuredSelection();
                Thing thing = (Thing)selection.getFirstElement();
                eventBroker.send(EventConstants.TOPIC_THING_SELECTION, thing);
            }
        });
    }

    public TableViewer getViewer() {
        return viewer;
    }

    
    // This will create the columns for the table
    private void createColumns(final Composite parent, final TableViewer viewer) {
    	
    	// https://stackoverflow.com/questions/12641354/putting-an-image-in-to-a-jface-table-cell-is-causing-gap-for-image-to-appear-in
    	TableViewerColumn col = createTableViewerColumn(Thing.IdHeader, 250, 0);
    	col.setLabelProvider(new ColumnLabelProvider() {
            @Override
            public String getText(Object element) {
                Thing t = (Thing) element;
                return t.getField((int)col.getColumn().getData());
            }
        });
    	
    	TableViewerColumn col2 = createTableViewerColumn(Thing.ThumbHeader, 150, 1);
    	col2.setLabelProvider(new ColumnLabelProvider() {
    		@Override
    		public Image getImage(Object element) {
    			Thing t = (Thing) element;
    			Image img = t.getThumbnail();
    			return img;
    		}
    		
    		@Override
            public String getText(Object element) {
    			return "";
    		}
    		
        });
    	
    	TableViewerColumn col3 = createTableViewerColumn(Thing.NameHeader, 400, 2);
    	col3.setLabelProvider(new ColumnLabelProvider() {
            @Override
            public String getText(Object element) {
                Thing t = (Thing) element;
                return t.getField((int)col3.getColumn().getData());
            }
        });
    }

    private TableViewerColumn createTableViewerColumn(String title, int bound, final int colNumber) {
        final TableViewerColumn viewerColumn = new TableViewerColumn(viewer,
                SWT.NONE);
        final TableColumn column = viewerColumn.getColumn();
        column.setText(title);
        column.setWidth(bound);
        column.setAlignment(SWT.LEFT);
        column.setResizable(true);
        column.setMoveable(true);
        column.setData(colNumber);
        
        return viewerColumn;

    }

    /**
     * Passing the focus request to the viewer's control.
     */
    public void setFocus() {
        viewer.getControl().setFocus();
    }
    
    
    @Inject
	@Optional
	private void subscribeTopicResultChanged
	    (@UIEventTopic(EventConstants.TOPIC_RESULT_CHANGED)
	        String empty) {
    	System.out.println("TOPIC_RESULT_CHANGED");
    	List<Thing> things = thingProvider.getThings();
    	viewer.setInput(things);
	    viewer.refresh(true);
    	if(things != null) {
    		statsLabel.setText(Integer.toString(things.size()) + " items");
    	    statsLabel.redraw();
    	}
	}
    
    
}