package org.symbian.tools.tmw.internal.ui.wizard;

import org.eclipse.core.databinding.DataBindingContext;

import org.eclipse.core.databinding.UpdateValueStrategy;

import org.eclipse.core.databinding.beans.BeansObservables;

import org.eclipse.core.databinding.observable.value.IObservableValue;

import org.eclipse.jface.databinding.viewers.IViewerObservableValue;

import org.eclipse.jface.databinding.viewers.ViewersObservables;

import org.eclipse.jface.viewers.ArrayContentProvider;

import org.eclipse.jface.viewers.DoubleClickEvent;

import org.eclipse.jface.viewers.IDoubleClickListener;

import org.eclipse.jface.viewers.ISelectionChangedListener;

import org.eclipse.jface.viewers.IStructuredSelection;

import org.eclipse.jface.viewers.LabelProvider;

import org.eclipse.jface.viewers.SelectionChangedEvent;

import org.eclipse.jface.viewers.TableViewer;

import org.eclipse.jface.viewers.ViewerSorter;

import org.eclipse.jface.wizard.IWizardPage;

import org.eclipse.jface.wizard.WizardPage;

import org.eclipse.swt.SWT;

import org.eclipse.swt.graphics.Image;

import org.eclipse.swt.layout.FormAttachment;

import org.eclipse.swt.layout.FormData;

import org.eclipse.swt.layout.FormLayout;

import org.eclipse.swt.layout.GridData;

import org.eclipse.swt.widgets.Composite;

import org.eclipse.swt.widgets.Display;

import org.eclipse.swt.widgets.Text;

import org.symbian.tools.tmw.ui.project.IProjectTemplate;

public class NewApplicationTemplateWizardPage extends WizardPage {

    public class ProjectTemplateLabelProvider extends LabelProvider {

        @Override

        public Image getImage(Object element) {

            return ((IProjectTemplate) element).getIcon();

        }

        @Override

        public String getText(Object element) {

            return ((IProjectTemplate) element).getName();

        }

    }

    private TableViewer templates;

    private Text description;

    private final WizardContext context;

    private final DataBindingContext bindingContext;

    public NewApplicationTemplateWizardPage(WizardContext context, DataBindingContext bindingContext) {

        super("Create a New Mobile Web Application");

        setTitle("Create a New Mobile Web Application");

        this.context = context;

        this.bindingContext = bindingContext;

        setDescription("Select project name and template that will be used to populate");

    }

    public void createControl(Composite parent) {

        Composite composite = new Composite(parent, SWT.NONE);

        composite.setLayoutData(new GridData(GridData.FILL, GridData.FILL, true, true));

        FormLayout layout = new FormLayout();

        layout.marginWidth = 5;

        composite.setLayout(layout);

        templates = new TableViewer(composite, SWT.BORDER | SWT.SINGLE);

        FormData templatesData = new FormData();

        templatesData.top = new FormAttachment(0, 0);

        templatesData.left = new FormAttachment(0, 0);

        templatesData.right = new FormAttachment(40, -2);

        templatesData.bottom = new FormAttachment(100, -8);

        templates.getControl().setLayoutData(templatesData);

        templates.addSelectionChangedListener(new ISelectionChangedListener() {

            public void selectionChanged(SelectionChangedEvent event) {

                IStructuredSelection selection = (IStructuredSelection) event.getSelection();

                final IProjectTemplate template = (IProjectTemplate) selection.getFirstElement();

                refreshSelection(template);

            }

        });

        templates.addDoubleClickListener(new IDoubleClickListener() {

            public void doubleClick(DoubleClickEvent arg0) {

                switchWizardPage();

            }

        });

        description = new Text(composite, SWT.BORDER | SWT.MULTI | SWT.WRAP | SWT.READ_ONLY);

        FormData descriptionData = new FormData();

        descriptionData.top = new FormAttachment(0, 0);

        descriptionData.bottom = new FormAttachment(100, -8);

        descriptionData.left = new FormAttachment(templates.getControl(), 5);

        descriptionData.right = new FormAttachment(100, 0);

        descriptionData.width = 50;

        description.setLayoutData(descriptionData);

        templates.setContentProvider(new ArrayContentProvider());

        templates.setLabelProvider(new ProjectTemplateLabelProvider());

        templates.setSorter(new ViewerSorter() {

            @Override

            public int category(Object element) {

                return Integer.valueOf(((IProjectTemplate) element).getWeight());

            }

        });

        setPageComplete(false);

        IObservableValue input = ViewersObservables.observeInput(templates);

        IObservableValue templ = BeansObservables.observeValue(context, WizardContext.TEMPLATES);

        bindingContext.bindValue(input, templ, new UpdateValueStrategy(UpdateValueStrategy.POLICY_NEVER),

                new UpdateValueStrategy(UpdateValueStrategy.POLICY_UPDATE));

        IViewerObservableValue selection = ViewersObservables.observeSingleSelection(templates);

        IObservableValue property = BeansObservables.observeValue(context, WizardContext.TEMPLATE);

        bindingContext.bindValue(selection, property);

        if (context.getTemplate() != null) {

            refreshSelection(context.getTemplate());

        }

        setErrorMessage(null);

        setControl(composite);

    }

    protected void switchWizardPage() {

        Display display = getShell().getDisplay();

        display.asyncExec(new Runnable() {

            public void run() {

                if (isPageComplete()) {

                    IWizardPage nextPage = getWizard().getNextPage(NewApplicationTemplateWizardPage.this);

                    getContainer().showPage(nextPage);

                }

            }

        });

    }

    protected void refreshSelection(IProjectTemplate template) {

        if (template != null) {

            description.setText(template.getDescription());

        } else {

            description.setText("");

        }

        validatePage();

    }

    protected boolean validatePage() {

        if (templates.getSelection().isEmpty()) {

            setErrorMessage("Project template is not selected");

            setPageComplete(false);

            return false;

        } else {

            setErrorMessage(null);

            setPageComplete(true);

            return true;

        }

    }

    public IProjectTemplate getSelectedProjectTemplate() {

        IStructuredSelection selection = (IStructuredSelection) templates.getSelection();

        return (IProjectTemplate) selection.getFirstElement();

    }

    @Override

    public void setVisible(boolean visible) {

        super.setVisible(visible);

        templates.getControl().setFocus();

    }

}