package org.simantics.proconf.g3d.views;

import org.eclipse.jface.viewers.ISelection;
import org.eclipse.swt.layout.GridData;
import org.eclipse.swt.layout.GridLayout;
import org.eclipse.swt.widgets.Composite;
import org.eclipse.swt.widgets.Control;
import org.eclipse.ui.ISelectionListener;
import org.eclipse.ui.IWorkbenchPart;
import org.eclipse.ui.forms.events.ExpansionAdapter;
import org.eclipse.ui.forms.events.ExpansionEvent;
import org.eclipse.ui.forms.widgets.FormToolkit;
import org.eclipse.ui.forms.widgets.ScrolledForm;
import org.eclipse.ui.forms.widgets.Section;
import org.simantics.proconf.ui.workbench.GraphAccessViewPart;
import org.simantics.utils.ui.jface.BaseSelectionProvider;

public abstract class SinglePageResourceView extends GraphAccessViewPart{
	protected Composite parent;
	private ScrolledForm form;
	private BaseSelectionProvider defaultInputSelectionProvider = new BaseSelectionProvider();
	protected FormToolkit toolkit;
	protected ISelectionListener pageSelectionListener;
	
	@Override
	public void createPartControl(Composite parent) {
		super.createPartControl(parent);
		this.parent = parent;

		toolkit = new FormToolkit(parent.getDisplay());
		form = getToolkit().createScrolledForm(parent);

		GridLayout layout = new GridLayout(2, false);
		form.getBody().setLayout(layout);
		form.getBody().setLayoutData(
				new GridData(GridData.FILL, GridData.FILL, true, true));

		getViewSite().setSelectionProvider(defaultInputSelectionProvider);

		// createWidgets();

		form.setText(getFormText());

		hookPageSelection();

	}
	
	
    /**
     * Receives selection changes
     * 
     * @param part
     * @param selection
     */
    protected void pageSelectionChanged(IWorkbenchPart part, ISelection selection) {
    	
    }
	
	
	
	
	
	protected abstract String getFormText();
	
	protected abstract void createWidgets();
	
	@Override
	public void setFocus() {
		//System.out.println("FormTypeEditorBase.setFocus(): Input = " + getInput());
		ScrolledForm form = getActiveForm();
		if (form != null) {
			form.setFocus();
		}
	}
	
	public FormToolkit getToolkit() {
		return toolkit;
	}
	
	public ScrolledForm getActiveForm() {
		return form;
	}
	
	public void clearForm() {
		for (Control c : form.getBody().getChildren())
			c.dispose();
		
	}
	
	protected Composite getBody() {
        return form.getBody();
    }
	
	public Composite newGridSection(
            int formColumns,
            int childColumns,
            boolean equalWidth,
            boolean grabVertical,
            String text,
            String description) 
    {
        return newGridSection(getBody(), formColumns, childColumns, equalWidth, grabVertical, text, description);
    }

    public Composite newGridSection(
            Composite parent,
            int formColumns,
            int childColumns,
            boolean equalWidth,
            boolean grabVertical,
            String text,
            String description)
    {
        FormToolkit toolkit = getToolkit();
        
        Section section = toolkit.createSection(parent,
                Section.DESCRIPTION | Section.TWISTIE | Section.TITLE_BAR | Section.EXPANDED);
        section.setLayoutData(new GridData(GridData.FILL, GridData.FILL, true, grabVertical, formColumns, 1));
        section.addExpansionListener(new ExpansionAdapter() {
            public void expansionStateChanged(ExpansionEvent e) {
                //System.out.println("SinglePageTypeEditor: expansionStateChanged " + e);
                //reflow(true);
            }
        });
        section.setText(text);
        section.setDescription(description);
        Composite sectionClient = toolkit.createComposite(section);
        sectionClient.setLayout(new GridLayout(childColumns, equalWidth));
        sectionClient.setLayoutData(new GridData());
        section.setClient(sectionClient);
        return sectionClient;
    }
    
    public void dispose() {
    	if (pageSelectionListener != null)
            getSite().getPage().removePostSelectionListener(pageSelectionListener);
    
    	super.dispose();
    }
    
    private void hookPageSelection() {
        pageSelectionListener = new ISelectionListener() {
            public void selectionChanged(IWorkbenchPart part, ISelection selection) {
                if (part == SinglePageResourceView.this)
                    return;
                pageSelectionChanged(part, selection);
            }
        };
        getSite().getPage().addPostSelectionListener(pageSelectionListener);
        ISelection sel = getSite().getPage().getSelection();
        IWorkbenchPart wb = getSite().getPage().getActivePart();
        pageSelectionChanged(wb, sel);
    }
    
}