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package org.dcache.services.billing.plots.util;

import java.io.File;
import java.util.ArrayList;
import java.util.Collections;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.Properties;

import org.dcache.services.billing.histograms.config.HistogramWrapper;

/**
 * Base class for {@link ITimeFramePlot} implementations. Handles basic
 * properties and histogram mapping.
 *
 * @author arossi
 */
public abstract class AbstractTimeFramePlot<H> implements ITimeFramePlot<H> {

    protected final Map<String, List<HistogramWrapper<H>>> histograms;
    protected final Properties properties;
    protected final String name;

    protected int rows;
    protected int cols;
    protected File exportSubdir;
    protected String extension;
    protected String imageType;

    protected AbstractTimeFramePlot(String name, Properties properties) {
        this.name = name;
        this.properties = properties;
        rows = Integer.parseInt(properties.getProperty(TimeFramePlotProperties.PLOT_GRID_ROWS));
        cols = Integer.parseInt(properties.getProperty(TimeFramePlotProperties.PLOT_GRID_COLS));
        String d = properties.getProperty(TimeFramePlotProperties.EXPORT_SUBDIR);
        if (d != null) {
            exportSubdir = new File(d);
            imageType = properties.getProperty(TimeFramePlotProperties.EXPORT_TYPE);
            extension = properties.getProperty(TimeFramePlotProperties.EXPORT_EXTENSION);
        }
        histograms = Collections.synchronizedMap
                        (new HashMap<>());
    }

    @Override
    public void addHistogram(PlotGridPosition position,
                    HistogramWrapper<H> histogram) {
        List<HistogramWrapper<H>> current = getHistogramsForPosition(position);
        current.add(histogram);
    }

    @Override
    public List<HistogramWrapper<H>> getHistogramsForPosition(
                    PlotGridPosition position) {
        checkPosition(position);
        List<HistogramWrapper<H>> current = histograms.get(position.getKey());
        if (current == null) {
            current = new ArrayList<>();
            histograms.put(position.getKey(), current);
        }
        return current;
    }

    private void checkPosition(PlotGridPosition position)
                    throws IllegalArgumentException {
        if (position == null) {
            throw new IllegalArgumentException("no grid position defined");
        }
        int row = position.getRow();
        int col = position.getCol();
        if (row < 0 || row >= rows || col < 0 || col >= cols) {
            throw new IllegalArgumentException("position " + position.getKey()
                            + " not on defined grid " + rows + " X " + cols);
        }
    }
}