/*******************************************************************************
 * Copyright (c) 2010 György Orosz.
 * 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:
 *     György Orosz - initial API and implementation
 ******************************************************************************/
package org.erlide.wrangler.refactoring.ui.wizardpages;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.Map.Entry;

import org.eclipse.jface.text.IDocument;
import org.eclipse.jface.wizard.IWizardPage;
import org.eclipse.swt.SWT;
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.Label;
import org.erlide.wrangler.refactoring.core.CostumWorkflowRefactoringWithPositionsSelection;
import org.erlide.wrangler.refactoring.selection.IErlMemberSelection;
import org.erlide.wrangler.refactoring.ui.ExpressionCheckButtonListener;
import org.erlide.wrangler.refactoring.util.GlobalParameters;
import org.erlide.wrangler.refactoring.util.IErlRange;
import org.erlide.wrangler.refactoring.util.WranglerUtils;

/**
 * Input page which displays text snippet positions and offers to user tp select
 * one or more of them
 *
 * @author Gyorgy Orosz
 * @version %I%, %G%
 */
public class SelectionInputPage extends InputPage {
    CostumWorkflowRefactoringWithPositionsSelection refactoring;

    String labelText, description;

    HashMap<Button, IErlRange> checkButtons;

    Composite composite;

    Label inputLabel;

    /**
     * Constructor
     *
     * @param name
     *            dialog title
     * @param description
     *            dialog description
     * @param labelText
     *            label of the input data
     * @param refac
     *            Wrangler refactoring
     */
    public SelectionInputPage(final String name, final String description,
            final String labelText,
            final CostumWorkflowRefactoringWithPositionsSelection refac) {
        super(name);
        setDescription(description);
        this.labelText = labelText;
        refactoring = refac;
    }

    @Override
    public void createControl(final Composite parent) {
        composite = new Composite(parent, SWT.NONE);

        inputLabel = new Label(composite, SWT.LEFT);
        inputLabel.setText(labelText);
        final GridData gridData = new GridData();
        gridData.horizontalAlignment = GridData.FILL;
        gridData.horizontalSpan = 2;
        inputLabel.setLayoutData(gridData);

        checkButtons = new HashMap<>();
        Button b;
        GridData gd;
        final IDocument doc = ((IErlMemberSelection) GlobalParameters
                .getWranglerSelection()).getDocument();
        for (final IErlRange r : refactoring.getPositions()) {
            b = new Button(composite, SWT.CHECK);
            b.setText(WranglerUtils.getTextFromEditor(r, doc) + " at " + r.toString());

            gd = new GridData();
            gd.horizontalAlignment = GridData.FILL;
            gd.horizontalSpan = 2;
            gd.grabExcessHorizontalSpace = true;
            b.setLayoutData(gd);
            checkButtons.put(b, r);

            final ExpressionCheckButtonListener l = new ExpressionCheckButtonListener(
                    checkButtons);
            b.addMouseTrackListener(l);
        }

        final GridLayout layout = new GridLayout();
        layout.numColumns = 2;
        composite.setLayout(layout);
        setControl(composite);

    }

    protected void setSelectedPositions() {
        final ArrayList<IErlRange> rl = new ArrayList<>();
        for (final Entry<Button, IErlRange> e : checkButtons.entrySet()) {
            if (e.getKey().getSelection()) {
                rl.add(e.getValue());
            }
        }
        refactoring.setSelectedPos(rl);
    }

    @Override
    protected boolean performFinish() {
        setSelectedPositions();
        return super.performFinish();
    }

    @Override
    public IWizardPage getNextPage() {
        setSelectedPositions();
        return super.getNextPage();
    }

    @Override
    protected boolean isInputValid() {
        return false;
    }

}