package org.simantics.views.swt.client.impl;

import java.util.ArrayList;
import java.util.Collections;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

import org.eclipse.jface.viewers.IPostSelectionProvider;
import org.eclipse.jface.viewers.ISelection;
import org.eclipse.jface.viewers.ISelectionChangedListener;
import org.eclipse.jface.viewers.ISelectionProvider;
import org.eclipse.swt.SWT;
import org.eclipse.swt.widgets.Composite;
import org.eclipse.ui.IWorkbenchSite;
import org.simantics.browsing.ui.Column;
import org.simantics.browsing.ui.StatePersistor;
import org.simantics.browsing.ui.swt.PassThruInputSource;
import org.simantics.browsing.ui.swt.widgets.ModelBrowser;
import org.simantics.browsing.ui.swt.widgets.impl.WidgetSupportImpl;
import org.simantics.scl.runtime.function.Function1;
import org.simantics.views.ViewUtils.ColumnBean;
import org.simantics.views.ViewUtils.LayoutBean;
import org.simantics.views.swt.client.base.SWTViewUtils;
import org.simantics.views.swt.client.base.SingleSWTViewNode;

public class SWTExplorer extends SingleSWTViewNode<ModelBrowser> {
	
	private static final long serialVersionUID = 7932335224632082902L;
	
	public LayoutBean layout;
	public String browseContext;
	public String contextMenuId;
	public String uiContext;
	public Function1<Object, Boolean> selectionListener;
	public Object input;
	public List<ColumnBean> columns;
	public List<ColumnBean> editingColumns;
	public Boolean columnsVisible;
	public Boolean displayFilter;
	public Boolean publishSelection;
	public Boolean useNodeBrowseContexts;
	public Boolean useNodeActionContexts;
	public StatePersistor persistor;

	public ISelection lastSelection;

	private ISelectionChangedListener internalToExternalSelectionPropagator = event -> {
		IWorkbenchSite site = getSite();
		if (site != null) {
			ISelectionProvider sp = site.getSelectionProvider();
			if (sp != null) {
				sp.setSelection(event.getSelection());
			}
		}
	};

	@Override
	public void createControls(Composite parent) {

		if(browseContext == null) return;
		
		final IWorkbenchSite site = getSite();

		Map<String, Object> args = new HashMap<String, Object>();
		args.put("displaySelectors", Boolean.FALSE);
		args.put("displayFilter", displayFilter != null ? displayFilter : Boolean.FALSE);
		if(useNodeBrowseContexts != null && useNodeBrowseContexts) {
			args.put("useNodeBrowseContexts", true);
		}
		if(useNodeActionContexts != null && useNodeActionContexts) {
			args.put("useNodeActionContexts", true);
		}

		control = new ModelBrowser(Collections.singleton(browseContext), args, site, parent, new WidgetSupportImpl(), style);
		control.setContextMenuId(contextMenuId);
		if (uiContext != null) {
			control.setUiContexts(Collections.singleton(uiContext));
		}

		control.setStatePersistor(persistor);

		control.finish();

		setProperties();

		control.setInputSource(PassThruInputSource.INSTANCE);

		ISelectionProvider isp = (ISelectionProvider)control.getExplorer().getAdapter(ISelectionProvider.class);
		if (isp instanceof IPostSelectionProvider) {
			((IPostSelectionProvider) isp).addPostSelectionChangedListener(internalToExternalSelectionPropagator);
		} else {
			isp.addSelectionChangedListener(internalToExternalSelectionPropagator);
		}

		control.addListenerToControl(SWT.Selection, event -> {
			if(selectionListener != null)
				selectionListener.apply(event);
			ISelection selection = (ISelection)control.getExplorer().getWidgetSelection();
			propertyCallback.apply("selection", selection);
			lastSelection = selection;
		});

	}

	public void synchronizeColumnsVisible(Boolean columnsVisible) {
		if(columnsVisible != null) control.setColumnsVisible(columnsVisible);
	}
	
	public void synchronizeDisplayFilter(Boolean displayFilter) {
//		if(displayFilter != null) control.setColumnsVisible(displayFilter);
	}

	public void synchronizePublishSelection(Boolean publishSelection) {
	}

	public void synchronizeInput(Object input) {
		if(input != null) control.setInput(input, false);
	}
	
	public void synchronizeBrowseContext(String browseContext) {
	}
	
	public void synchronizeContextMenuId(String contextMenuId) {
	}

	public void synchronizeSelectionListener(Function1<Object, Boolean> selectionListener) {
	}

	public void synchronizePersistor(StatePersistor persistor) {
	}

	public void synchronizeColumns(ArrayList<ColumnBean> columns) {
		if(columns != null) {
			Column[] cols = new Column[columns.size()];
			for(int i=0;i<columns.size();i++) cols[i] = SWTViewUtils.toColumn(columns.get(i));
			control.setColumns(cols);
		}
	}

	public void synchronizeEditingColumns(ArrayList<ColumnBean> columns) {
		if(columns != null) {
			String[] ecs = new String[columns.size()];
			for(int i=0;i<columns.size();i++) ecs[i] = columns.get(i).key;
			control.setEditingColumn(ecs);
		}
	}

	final public void synchronizeLayout(LayoutBean layout) {
	}

	@Override
	public void dispose() {
		ISelectionProvider isp = (ISelectionProvider)control.getExplorer().getAdapter(ISelectionProvider.class);
		if (isp instanceof IPostSelectionProvider) {
			((IPostSelectionProvider) isp).removePostSelectionChangedListener(internalToExternalSelectionPropagator);
		} else {
			isp.removeSelectionChangedListener(internalToExternalSelectionPropagator);
		}
		super.dispose();
	}

}