/*******************************************************************************
 * Copyright (c) 2007, 2011 IBM Corporation and others.
 * 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:
 *     IBM Corporation - initial API and implementation
 *******************************************************************************/
package org.eclipse.che.ide.ext.java.jdt.templates;

import org.eclipse.che.ide.ext.java.jdt.templates.api.TemplateContext;
import org.eclipse.che.ide.ext.java.jdt.templates.api.TemplateVariable;
import org.eclipse.che.ide.ext.java.jdt.templates.api.TemplateVariableResolver;

import java.util.Iterator;
import java.util.List;

/**
 * Resolver for the <code>link</code> variable. Resolves to a first parameter puts the value into linked mode. Shows proposals for
 * each parameter.
 *
 * @since 3.4
 */
public class LinkResolver extends TemplateVariableResolver {

    private String[] fProposals;

    public LinkResolver(String type, String description) {
        super(type, description);
    }

    /** Default ctor for instantiation by the extension point. */
    public LinkResolver() {
    }

    /*
     * (non-Javadoc)
     * @see org.eclipse.jface.text.templates.TemplateVariableResolver#resolve(org.eclipse.jface.text.templates.TemplateVariable,
     * org.eclipse.jface.text.templates.TemplateContext)
     */
    @Override
    public void resolve(TemplateVariable variable, TemplateContext context) {

        variable.setUnambiguous(false);

        if (variable instanceof JavaVariable) {
            JavaContext jc = (JavaContext)context;
            JavaVariable jv = (JavaVariable)variable;

            List<String> params = variable.getVariableType().getParams();
            if (params.size() > 0) {
                fProposals = new String[params.size()];
                int i = 0;
                for (Iterator<String> iterator = params.iterator(); iterator.hasNext(); ) {
                    String param = iterator.next();
                    fProposals[i] = param;
                    i++;
                }
                jv.setChoices(fProposals);
                jv.setCurrentChoice(fProposals[0]);

                jc.markAsUsed(jv.getDefaultValue());
            } else {
                fProposals = new String[]{variable.getDefaultValue()};
                super.resolve(variable, context);
                return;
            }
        } else
            super.resolve(variable, context);
    }

    /*
     * (non-Javadoc)
     * @see org.eclipse.jface.text.templates.TemplateVariableResolver#resolveAll(org.eclipse.jface.text.templates.TemplateContext)
     */
    @Override
    protected String[] resolveAll(TemplateContext context) {
        return fProposals;
    }
}