/******************************************************************************
* Copyright (C) 2006-2012  IFS Institute for Software 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
*
* Original authors:
*     Dennis Hunziker
*     Ueli Kistler
*     Reto Schuettel
*     Robin Stocker
* Contributors:
*     Fabio Zadrozny <fabiofz@gmail.com> - initial implementation
******************************************************************************/
/* 
 * Copyright (C) 2006, 2007  Dennis Hunziker, Ueli Kistler
 * Copyright (C) 2007  Reto Schuettel, Robin Stocker
 *
 * IFS Institute for Software, HSR Rapperswil, Switzerland
 * 
 */

package org.python.pydev.refactoring.core.model;

import java.util.ArrayList;
import java.util.List;

import org.eclipse.jface.viewers.IStructuredContentProvider;
import org.eclipse.jface.viewers.Viewer;
import org.python.pydev.refactoring.ast.adapters.AbstractScopeNode;
import org.python.pydev.refactoring.ast.adapters.offsetstrategy.IOffsetStrategy;
import org.python.pydev.refactoring.messages.Messages;

public class OffsetStrategyProvider implements IStructuredContentProvider {

    private List<OffsetStrategyModel> strategies;

    private String initLabel;

    private String beginLabel;

    private String endLabel;

    public OffsetStrategyProvider(int strategyOption) {
        strategies = new ArrayList<OffsetStrategyModel>();
        initLabel();
        initStrategies(strategyOption);
    }

    public OffsetStrategyProvider(AbstractScopeNode<?> scopeAdapter, int strategyOption) {
        strategies = new ArrayList<OffsetStrategyModel>();
        strategyOption = updateLabel(scopeAdapter, strategyOption);
        initStrategies(strategyOption);
    }

    private void initLabel() {
        initLabel = Messages.offsetStrategyAfterInit;
        beginLabel = Messages.offsetStrategyBegin;
        endLabel = Messages.offsetStrategyEnd;
    }

    private int updateLabel(AbstractScopeNode<?> scopeAdapter, int strategyOption) {
        if (scopeAdapter != null) {

            if (scopeAdapter.getNodeBodyIndent().length() == 0) {
                beginLabel = Messages.offsetStrategyBeginModule;
                endLabel = Messages.offsetStrategyEndModule;
                if ((strategyOption & IOffsetStrategy.AFTERINIT) == IOffsetStrategy.AFTERINIT) {
                    strategyOption &= ~IOffsetStrategy.AFTERINIT;
                }
            } else {
                initLabel();
            }
        }
        return strategyOption;
    }

    private void initStrategies(int strategyOption) {
        setStrategy(strategyOption, IOffsetStrategy.BEFORECURRENT, "Before current method.");
        setStrategy(strategyOption, IOffsetStrategy.AFTERINIT, initLabel);
        setStrategy(strategyOption, IOffsetStrategy.BEGIN, beginLabel);
        setStrategy(strategyOption, IOffsetStrategy.END, endLabel);
    }

    private void setStrategy(int strategyOption, int id, String label) {
        if ((strategyOption & id) == id) {
            strategies.add(new OffsetStrategyModel(id, label));
        }
    }

    public OffsetStrategyModel get(int i) {
        return this.strategies.get(i);
    }

    @Override
    public Object[] getElements(Object inputElement) {

        return strategies.toArray();
    }

    @Override
    public void dispose() {
        this.strategies = null;
    }

    @Override
    public void inputChanged(Viewer viewer, Object oldInput, Object newInput) {
    }

}