package org.simantics.district.selection.ui.parts;

import java.util.List;

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

import org.eclipse.e4.ui.di.Focus;
import org.eclipse.e4.ui.model.application.MApplication;
import org.eclipse.e4.ui.model.application.ui.basic.MPart;
import org.eclipse.e4.ui.model.application.ui.menu.MHandledToolItem;
import org.eclipse.e4.ui.model.application.ui.menu.MMenuContribution;
import org.eclipse.e4.ui.model.application.ui.menu.MMenuFactory;
import org.eclipse.e4.ui.model.application.ui.menu.MPopupMenu;
import org.eclipse.e4.ui.model.application.ui.menu.MToolBar;
import org.eclipse.e4.ui.model.application.ui.menu.MToolBarElement;
import org.eclipse.e4.ui.services.EMenuService;
import org.eclipse.e4.ui.workbench.modeling.ESelectionService;
import org.eclipse.swt.SWT;
import org.eclipse.swt.widgets.Composite;
import org.simantics.district.selection.ElementSelector;
import org.simantics.district.selection.ui.ElementSelectorTableUI;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

public class ElementSelectionView {
	private static final String CONTEXT_MENU_ID = "org.simantics.district.selection.ui.contextMenu";
	private static final String POPUP_ID = "org.simantics.district.selection.ui.selectiontable.popup";
	private static final String CREATE_NEW_ID = "org.simantics.district.selection.ui.command.createNewSelection";
	private static final String CREATE_NEW_LABEL = "Create New Element Selection Query";
	private static final String CREATE_NEW_ICON = "platform:/plugin/com.famfamfam.silk/icons/add.png";
	private static final String EDIT_ID = "org.simantics.district.selection.ui.command.editElementSelector";
	private static final String EDIT_LABEL = "Edit Element Selection Query";
	private static final String EDIT_ICON = "platform:/plugin/com.famfamfam.silk/icons/pencil.png";
	private static final String DELETE_ID = "org.simantics.district.selection.ui.command.deleteElementSelector";
	private static final String DELETE_LABEL = "Delete Element Selection Query";
	private static final String DELETE_ICON = "platform:/plugin/com.famfamfam.silk/icons/cross.png";
	
	private static final Logger LOGGER = LoggerFactory.getLogger(ElementSelectionView.class);

	private ElementSelectorTableUI table;

	@Inject
	private ESelectionService selectionService;

	@Inject
	public void init(MPart part, MApplication app) {
		// Command is contributed via fragment
		MHandledToolItem createItem = MMenuFactory.INSTANCE.createHandledToolItem();
		createItem.setCommand(app.getCommand(CREATE_NEW_ID));
		createItem.setLabel(CREATE_NEW_LABEL);
		createItem.setIconURI(CREATE_NEW_ICON);
		MHandledToolItem editItem = MMenuFactory.INSTANCE.createHandledToolItem();
		editItem.setCommand(app.getCommand(EDIT_ID));
		editItem.setLabel(EDIT_LABEL);
		editItem.setIconURI(EDIT_ICON);
		MHandledToolItem deleteItem = MMenuFactory.INSTANCE.createHandledToolItem();
		deleteItem.setCommand(app.getCommand(DELETE_ID));
		deleteItem.setLabel(DELETE_LABEL);
		deleteItem.setIconURI(DELETE_ICON);
		
		MToolBar toolBar = MMenuFactory.INSTANCE.createToolBar();
		toolBar.setToBeRendered(true);
		
		List<MToolBarElement> children = toolBar.getChildren();
		children.add(createItem);
		children.add(editItem);
		children.add(deleteItem);
		
		part.setToolbar(toolBar);

		MPopupMenu popupMenu = MMenuFactory.INSTANCE.createPopupMenu();
		popupMenu.setElementId(POPUP_ID);

		List<MMenuContribution> menuContributions = app.getMenuContributions();
		for (MMenuContribution menuContribution : menuContributions) {
			if (CONTEXT_MENU_ID.equals(menuContribution.getParentId())) {
				popupMenu.getChildren().addAll(menuContribution.getChildren());
			}
		}

		part.getMenus().add(popupMenu);
	}

	@PostConstruct
	public void createPartControl(Composite parent, EMenuService menuService) {
		table = new ElementSelectorTableUI(selectionService, parent, SWT.BORDER);
		if (!(menuService.registerContextMenu(this.table.getTree(), POPUP_ID)))
			LOGGER.warn("Could not register context menu {}", POPUP_ID);
	}

	@Focus
	public void setFocus() {
		table.setFocus();
	}

	public ElementSelector getSelectedItem() {
		return table.getSelectedItem();
	}
}