package com.onaro.util.jfc.grouping;

import com.onaro.sanscreen.client.view.tabular.value.NumberValue;
import com.onaro.util.jfc.grouping.GroupingModel.State.Row;

public class RatioSummarizer implements Summarizer {

    private int column;

    private int sourceColumnNominator;

    private int sourceColumnDenominator;

    private boolean complement;

    /**
     * Defined the format-name used by {@link NumberValue} to format the number.
     */
    private String format;


    public RatioSummarizer(int column, int sourceColumnNominator, int sourceColumnDenominator, boolean complement, String format) {
        this.format = format;
        this.column = column;
        this.sourceColumnNominator = sourceColumnNominator;
        this.sourceColumnDenominator = sourceColumnDenominator;
        this.complement = complement;
    }

    public RatioSummarizer(int column, int sourceColumnNominator, int sourceColumnDenominator, boolean complement) {
        this(column, sourceColumnNominator, sourceColumnDenominator, complement, NumberValue.FORMAT_DEFAULT);
    }
    
    public void updateSummary(Node node) {
        int childCount = node.getChildCount();
        if (childCount > 0) {
//            for (int childInd = 0 ; childInd < childCount; ++childInd) {
//                Node child = node.getChild(childInd);
//                computeValue(child);
//            }
            computeValue(node);
        }
    }

    private void computeValue(Node node) {
        double nominator = getNumberValue(node.getValueAt(sourceColumnNominator));
        double denominator = getNumberValue(node.getValueAt(sourceColumnDenominator));
        double value = -1.0;
        if (denominator!=0) {
            value = nominator/denominator;
            if (complement)
                value = 1-value;
        }
        if (value >= 0) {
            NumberValue numberValue = new NumberValue(value, null, format);
            if (node instanceof Row) {
                ((Row)node).setOverlayValueAt(column, numberValue);
            } else {
                node.setValueAt(column, numberValue);
            }
        }
    }

    private double getNumberValue(Object value) {
        if (value instanceof Number) {
            return ((Number)value).doubleValue();
        } else if (value instanceof NumberValue) {
            return ((NumberValue) value).getNumber();
        }
        return 0;
    }

}