/**
 * <copyright>
 * 
 * Copyright (c) 2009-2010 Thales Corporate Services S.A.S.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 * 
 * Contributors:
 * Thales Corporate Services S.A.S - initial API and implementation
 * 
 * </copyright>
 */

package org.eclipse.egf.pattern.ui.editors.pages;

import org.eclipse.core.databinding.UpdateValueStrategy;
import org.eclipse.core.databinding.conversion.IConverter;
import org.eclipse.core.databinding.observable.value.IObservableValue;
import org.eclipse.core.databinding.validation.IValidator;
import org.eclipse.core.runtime.IStatus;
import org.eclipse.core.runtime.Status;
import org.eclipse.egf.model.fcore.FcorePackage;
import org.eclipse.egf.model.pattern.Pattern;
import org.eclipse.egf.model.pattern.PatternLibrary;
import org.eclipse.egf.model.pattern.PatternPackage;
import org.eclipse.egf.pattern.engine.PatternHelper;
import org.eclipse.egf.pattern.ui.ImageShop;
import org.eclipse.egf.pattern.ui.Messages;
import org.eclipse.egf.pattern.ui.PatternUIHelper;
import org.eclipse.egf.pattern.ui.editors.PatternEditorInput;
import org.eclipse.egf.pattern.ui.editors.adapter.LiveValidationContentAdapter;
import org.eclipse.egf.pattern.ui.editors.dialogs.ContainerLibrarySelectionDialog;
import org.eclipse.egf.pattern.ui.editors.validation.ValidationConstants;
import org.eclipse.emf.databinding.EMFUpdateValueStrategy;
import org.eclipse.emf.databinding.edit.EMFEditProperties;
import org.eclipse.emf.databinding.edit.IEMFEditValueProperty;
import org.eclipse.emf.ecore.EReference;
import org.eclipse.emf.transaction.RecordingCommand;
import org.eclipse.emf.transaction.TransactionalEditingDomain;
import org.eclipse.jface.databinding.swt.IWidgetValueProperty;
import org.eclipse.jface.databinding.swt.WidgetProperties;
import org.eclipse.jface.window.Window;
import org.eclipse.swt.SWT;
import org.eclipse.swt.events.SelectionEvent;
import org.eclipse.swt.events.SelectionListener;
import org.eclipse.swt.graphics.Color;
import org.eclipse.swt.layout.GridData;
import org.eclipse.swt.layout.GridLayout;
import org.eclipse.swt.widgets.Button;
import org.eclipse.swt.widgets.Composite;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.Label;
import org.eclipse.swt.widgets.Shell;
import org.eclipse.swt.widgets.Text;
import org.eclipse.ui.forms.FormColors;
import org.eclipse.ui.forms.IFormColors;
import org.eclipse.ui.forms.IManagedForm;
import org.eclipse.ui.forms.IMessageManager;
import org.eclipse.ui.forms.editor.FormEditor;
import org.eclipse.ui.forms.events.HyperlinkEvent;
import org.eclipse.ui.forms.events.IHyperlinkListener;
import org.eclipse.ui.forms.widgets.FormToolkit;
import org.eclipse.ui.forms.widgets.ImageHyperlink;
import org.eclipse.ui.forms.widgets.ScrolledForm;
import org.eclipse.ui.forms.widgets.Section;

/**
 * @author Thomas Guiu
 * 
 */
public class OverviewPage extends PatternEditorPage {

  public static final String ID = "OverviewPage"; //$NON-NLS-1$

  private FormEditor editor;

  private Text nameText;

  private Text fullNameText;

  private Text descripition;

  private Button browse;

  private FormColors colors = new FormColors(Display.getDefault());

  private LiveValidationContentAdapter patternNameEmpetyValidationAdapter;

  private IMessageManager mmng;

  public OverviewPage(FormEditor editor) {
    super(editor, ID, Messages.OverviewPage_title);
    this.editor = editor;
  }

  protected void doCreateFormContent(IManagedForm managedForm) {
    FormToolkit toolkit = managedForm.getToolkit();
    ScrolledForm form = managedForm.getForm();
    mmng = managedForm.getMessageManager();

    GridLayout gridLayout = new GridLayout();
    form.getBody().setLayout(gridLayout);
    form.setImage(ImageShop.get(ImageShop.IMG_PLUGIN_MF_OBJ));
    form.setText(Messages.OverviewPage_title);

    Composite container = toolkit.createComposite(form.getBody(), SWT.NONE);
    gridLayout = new GridLayout(2, true);
    container.setLayout(gridLayout);
    GridData gd = new GridData(GridData.FILL_BOTH);
    container.setLayoutData(gd);
    container.setFocus();

    createLeftContainer(toolkit, container);
    createRightContainer(toolkit, container);
    createDescriContainer(toolkit, container);

    checkReadOnlyModel();

    form.reflow(true);
  }

  /**
   * Check whether the editor is on a read only pattern.
   */
  private void checkReadOnlyModel() {
    PatternEditorInput editorInput = (PatternEditorInput) getEditorInput();
    if (!editorInput.isReadOnly()) {
      return;
    }
    nameText.setEnabled(false);
    fullNameText.setEnabled(false);
    descripition.setEnabled(false);
    browse.setEnabled(false);
  }

  private void createLeftContainer(FormToolkit toolkit, Composite container) {
    Section sectionLeft = toolkit.createSection(container, Section.TITLE_BAR);
    sectionLeft.setText(Messages.OverviewPage_sectionLeft_title);

    GridData gd = new GridData(GridData.VERTICAL_ALIGN_BEGINNING | GridData.FILL_HORIZONTAL);
    gd.minimumWidth = 300;
    gd.heightHint = 200;
    sectionLeft.setLayoutData(gd);

    Composite containerLeft = toolkit.createComposite(sectionLeft, SWT.NONE);
    GridLayout gridLayout = new GridLayout(2, false);
    containerLeft.setLayout(gridLayout);
    gd = new GridData(GridData.VERTICAL_ALIGN_BEGINNING | GridData.FILL_BOTH);
    containerLeft.setLayoutData(gd);

    String titletext = Messages.OverviewPage_sectionLeft_title_label;
    Label title = toolkit.createLabel(containerLeft, titletext, SWT.WRAP);
    gd = new GridData(GridData.FILL_HORIZONTAL | GridData.GRAB_HORIZONTAL);
    gd.widthHint = 20;
    gd.horizontalSpan = 2;
    title.setLayoutData(gd);

    createPatternInfoContainer(toolkit, containerLeft);

    sectionLeft.setClient(containerLeft);
  }

  private void createPatternInfoContainer(FormToolkit toolkit, Composite containerLeft) {
    Composite patternInfo = toolkit.createComposite(containerLeft, SWT.NONE);
    GridLayout gridLayout = new GridLayout(3, false);
    patternInfo.setLayout(gridLayout);

    GridData gd = new GridData(GridData.FILL_HORIZONTAL);
    gd.horizontalSpan = 2;
    patternInfo.setLayoutData(gd);

    Label nameLabel = toolkit.createLabel(patternInfo, Messages.OverviewPage_sectionLeft_name_label, SWT.WRAP);
    gd = new GridData();
    gd.widthHint = 80;
    nameLabel.setLayoutData(gd);
    nameLabel.setForeground(colors.getColor(IFormColors.TITLE));

    nameText = toolkit.createText(patternInfo, getPattern() == null ? "" : getPattern().getName(), SWT.BORDER); //$NON-NLS-1$
    gd = new GridData(GridData.FILL_HORIZONTAL);
    gd.widthHint = 20;
    gd.horizontalIndent = 5;
    gd.horizontalSpan = 2;
    nameText.setLayoutData(gd);

    Label fullNameLabel = toolkit.createLabel(patternInfo, Messages.OverviewPage_sectionLeft_fullName_label, SWT.WRAP);
    gd = new GridData();
    gd.widthHint = 80;
    fullNameLabel.setLayoutData(gd);
    fullNameLabel.setForeground(colors.getColor(IFormColors.TITLE));

    Color color = Display.getDefault().getSystemColor(SWT.COLOR_DARK_GRAY);
    String fullName = PatternHelper.getFullLibraryName(getPattern());

    fullNameText = toolkit.createText(patternInfo, PatternHelper.getFullLibraryName(getPattern()), SWT.BORDER | SWT.READ_ONLY); //$NON-NLS-1$
    gd = new GridData(GridData.FILL_HORIZONTAL);
    gd.horizontalIndent = 5;
    fullNameText.setLayoutData(gd);
    fullNameText.setForeground(color);
    fullNameText.setText(fullName == null ? "" : fullName); //$NON-NLS-1$

    browse = toolkit.createButton(patternInfo, Messages.OverviewPage_button_browse, SWT.PUSH);
    gd = new GridData();
    gd.widthHint = 65;
    browse.setLayoutData(gd);
    browse.setEnabled(false);
    browse.addSelectionListener(new SelectionListener() {

      public void widgetSelected(SelectionEvent e) {
        ContainerLibrarySelectionDialog dialog = new ContainerLibrarySelectionDialog(new Shell(), getPattern().getContainer());
        dialog.setTitle(Messages.OverviewPage_browse_dialog_title);
        if (dialog.open() == Window.OK) {
          final PatternLibrary patternLibrary = dialog.getLibraryContainer();
          TransactionalEditingDomain editingDomain = getEditingDomain();
          RecordingCommand cmd = new RecordingCommand(editingDomain) {
            protected void doExecute() {
              Pattern pattern = getPattern();
              pattern.setContainer(patternLibrary);
            }
          };
          editingDomain.getCommandStack().execute(cmd);
        }
      }

      public void widgetDefaultSelected(SelectionEvent e) {
      }
    });

    Label idLabel = toolkit.createLabel(patternInfo, Messages.OverviewPage_sectionLeft_id_label, SWT.WRAP);
    gd = new GridData();
    idLabel.setLayoutData(gd);
    idLabel.setForeground(colors.getColor(IFormColors.TITLE));

    Text idText = toolkit.createText(patternInfo, getPattern() == null ? "" : getPattern().getID(), SWT.BORDER | SWT.READ_ONLY); //$NON-NLS-1$
    gd = new GridData(GridData.FILL_HORIZONTAL);
    gd.horizontalSpan = 2;
    gd.widthHint = 20;
    gd.horizontalIndent = 5;
    idText.setLayoutData(gd);
    idText.setForeground(color);
  }

  private void createDescriContainer(FormToolkit toolkit, Composite container) {

    Composite containerDesci = toolkit.createComposite(container, SWT.NONE);
    GridLayout gridLayout = new GridLayout();
    containerDesci.setLayout(gridLayout);
    GridData gd = new GridData(GridData.FILL_BOTH);
    gd.horizontalSpan = 2;
    containerDesci.setLayoutData(gd);

    Label title = toolkit.createLabel(containerDesci, Messages.OverviewPage_sectionLeft_descripition_label, SWT.WRAP);
    gd = new GridData();
    gd.verticalIndent = 0;
    title.setLayoutData(gd);
    title.setForeground(colors.getColor(IFormColors.TITLE));

    Label desciLabel = toolkit.createLabel(containerDesci, Messages.OverviewPage_sectionLeft_desci_label, SWT.WRAP);
    desciLabel.setLayoutData(new GridData(GridData.FILL_HORIZONTAL | GridData.GRAB_HORIZONTAL));

    String patternDescripition = getPattern() == null ? "" : getPattern().getDescription(); //$NON-NLS-1$
    descripition = toolkit.createText(containerDesci, patternDescripition, SWT.BORDER | SWT.V_SCROLL | SWT.H_SCROLL | SWT.WRAP);
    gd = new GridData(GridData.FILL_BOTH);
    gd.heightHint = 280;
    gd.widthHint = 280;
    gd.verticalIndent = 7;
    gd.horizontalIndent = 3;
    descripition.setLayoutData(gd);
  }

  private void createRightContainer(FormToolkit toolkit, Composite container) {
    Section sectionRight = toolkit.createSection(container, Section.TITLE_BAR);
    sectionRight.setText(Messages.OverviewPage_sectionRight_title);

    GridData gd = new GridData(GridData.VERTICAL_ALIGN_BEGINNING | GridData.FILL_HORIZONTAL);
    gd.minimumWidth = 300;
    gd.heightHint = 200;
    sectionRight.setLayoutData(gd);

    Composite containerRight = toolkit.createComposite(sectionRight, SWT.NONE);
    GridLayout gridLayout = new GridLayout(2, false);
    containerRight.setLayout(gridLayout);
    gd = new GridData(GridData.VERTICAL_ALIGN_BEGINNING | GridData.FILL_BOTH);
    gd.verticalIndent = 0;
    containerRight.setLayoutData(gd);

    String titletext = Messages.OverviewPage_sectionRight_title_label;
    Label title = toolkit.createLabel(containerRight, titletext, SWT.WRAP);
    gd = new GridData(GridData.FILL_HORIZONTAL | GridData.GRAB_HORIZONTAL);
    gd.widthHint = 100;
    gd.horizontalSpan = 2;
    title.setLayoutData(gd);

    Composite containerLink = toolkit.createComposite(containerRight, SWT.NONE);
    gridLayout = new GridLayout(2, false);
    containerLink.setLayout(gridLayout);
    gd = new GridData(GridData.FILL_HORIZONTAL);
    gd.horizontalSpan = 2;
    containerLink.setLayoutData(gd);

    ImageHyperlink specLink = toolkit.createImageHyperlink(containerLink, SWT.NULL);
    specLink.setText(Messages.OverviewPage_sectionRight_specLink_label);
    specLink.setImage(ImageShop.get(ImageShop.IMG_LOCALVARIABLE_OBJ));
    gd = new GridData();
    specLink.setLayoutData(gd);
    specLink.addHyperlinkListener(new IHyperlinkListener() {

      public void linkExited(HyperlinkEvent e) {
      }

      public void linkEntered(HyperlinkEvent e) {
      }

      public void linkActivated(HyperlinkEvent e) {
        editor.setActivePage(SpecificationPage.ID);
      }
    });

    Label specLabel = toolkit.createLabel(containerLink, Messages.OverviewPage_sectionRight_spec_label, SWT.WRAP);
    gd = new GridData(GridData.FILL_HORIZONTAL | GridData.GRAB_HORIZONTAL);
    gd.widthHint = 100;
    specLabel.setLayoutData(gd);

    ImageHyperlink implLink = toolkit.createImageHyperlink(containerLink, SWT.NULL);
    implLink.setText(Messages.OverviewPage_sectionRight_implLink_label);
    implLink.setImage(ImageShop.get(ImageShop.IMG_METHPUB_OBJ));
    gd = new GridData();
    gd.verticalIndent = 20;
    implLink.setLayoutData(gd);
    implLink.addHyperlinkListener(new IHyperlinkListener() {

      public void linkExited(HyperlinkEvent e) {
      }

      public void linkEntered(HyperlinkEvent e) {
      }

      public void linkActivated(HyperlinkEvent e) {
        editor.setActivePage(ImplementationPage.ID);
      }
    });

    Label implLabel = toolkit.createLabel(containerLink, Messages.OverviewPage_sectionRight_impl_label, SWT.WRAP);
    gd = new GridData(GridData.FILL_HORIZONTAL | GridData.GRAB_HORIZONTAL);
    gd.verticalIndent = 18;
    gd.widthHint = 100;
    implLabel.setLayoutData(gd);

    sectionRight.setClient(containerRight);
  }

  void bindName() {
    Pattern pattern = getPattern();
    IEMFEditValueProperty mprop = EMFEditProperties.value(getEditingDomain(), FcorePackage.Literals.NAMED_MODEL_ELEMENT__NAME);
    IWidgetValueProperty textProp = WidgetProperties.text(SWT.Modify);
    IObservableValue uiObs = textProp.observeDelayed(400, nameText);
    IObservableValue mObs = mprop.observe(pattern);

    addBinding(ctx.bindValue(uiObs, mObs, new EMFUpdateValueStrategy().setBeforeSetValidator(new IValidator() {

      public IStatus validate(Object value) {

        return Status.OK_STATUS;
      }
    }), null));
  }

  void bindDescripition() {
    IEMFEditValueProperty mprop = EMFEditProperties.value(getEditingDomain(), FcorePackage.Literals.MODEL_ELEMENT__DESCRIPTION);
    IWidgetValueProperty textProp = WidgetProperties.text(SWT.Modify);
    IObservableValue uiObs = textProp.observeDelayed(400, descripition);
    IObservableValue mObs = mprop.observe(getPattern());

    addBinding(ctx.bindValue(uiObs, mObs, new EMFUpdateValueStrategy().setBeforeSetValidator(new IValidator() {

      public IStatus validate(Object value) {

        return Status.OK_STATUS;
      }
    }), null));
  }

  void bindContainer() {
    IEMFEditValueProperty mprop = EMFEditProperties.value(getEditingDomain(), PatternPackage.Literals.PATTERN_ELEMENT__CONTAINER);
    IWidgetValueProperty textProp = WidgetProperties.text(SWT.Modify);
    IObservableValue uiObs = textProp.observeDelayed(400, fullNameText);
    IObservableValue mObs = mprop.observe(getPattern());

    UpdateValueStrategy targetToModel = new EMFUpdateValueStrategy().setBeforeSetValidator(new IValidator() {
      public IStatus validate(Object value) {

        return Status.OK_STATUS;
      }

    });
    UpdateValueStrategy modelToTarget = new UpdateValueStrategy();
    modelToTarget.setConverter(new IConverter() {
      public Object getToType() {
        return String.class;
      }

      public Object getFromType() {
        return EReference.class;
      }

      public Object convert(Object fromObject) {
        if (fromObject == null || !(fromObject instanceof PatternLibrary)) {
          return ""; //$NON-NLS-1$
        }
        return ((PatternLibrary) fromObject).getName();
      }
    });

    addBinding(ctx.bindValue(uiObs, mObs, targetToModel, modelToTarget));
  }

  @Override
  protected void bind() {
    if (getPattern() != null) {
      bindName();
      bindDescripition();
      bindContainer();
      patternNameEmpetyValidationAdapter = PatternUIHelper.addValidationAdapeter(mmng, getPattern(), ValidationConstants.CONSTRAINTS_PATTERN_NAME_NOT_EMPTY_ID, nameText);
    }
  }

  @Override
  public void dispose() {
    PatternUIHelper.removeAdapterForPattern(getPattern(), patternNameEmpetyValidationAdapter);
    super.dispose();
  }

}