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/*
 * JBoss, Home of Professional Open Source
 * Copyright 2013, Red Hat, Inc. and individual contributors
 * by the @authors tag. See the copyright.txt in the distribution for a
 * full listing of individual contributors.
 *
 * This is free software; you can redistribute it and/or modify it
 * under the terms of the GNU Lesser General Public License as
 * published by the Free Software Foundation; either version 2.1 of
 * the License, or (at your option) any later version.
 *
 * This software is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this software; if not, write to the Free
 * Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
 * 02110-1301 USA, or see the FSF site: http://www.fsf.org.
 */
package org.richfaces.model;

import java.io.IOException;

import org.richfaces.json.JSONArray;
import org.richfaces.json.JSONObject;
import org.richfaces.renderkit.ChartRendererBase;


/**
 * @author Lukas Macko
 */
public class BarStrategy implements ChartStrategy {

    @Override
    public Object export(ChartDataModel model) throws IOException {
        JSONObject obj = model.defaultExport();

        JSONObject bars = new JSONObject();
        ChartRendererBase.addAttribute(bars, "show", true);
        ChartRendererBase.addAttribute(bars, "barWidth", calculateBarWidth(obj));
        ChartRendererBase.addAttribute(obj, "bars", bars);

        return obj;
    }

    private double calculateBarWidth(JSONObject o) {
        JSONArray data = o.optJSONArray("data");

        if (data != null) {
            JSONArray last = data.optJSONArray(data.length() - 1);
            if (last != null) {
                // x value of last element ~ number of ticks
                // barWidth = 1 / (points-per-tick + 1)
                return 1 / (data.length() / last.optDouble(0) + 1);
            }
        }

        return 1.0;
    }

}