package hep.aida.ref.histogram;

/**
 * Implementation of ICloud1D.
 * @author The AIDA team at SLAC.
 *
 */

import hep.aida.ICloud1D;
import hep.aida.IHistogram;
import hep.aida.IHistogram1D;

import java.util.ArrayList;

import java.io.Serializable;


public class Cloud1D extends Cloud implements ICloud1D {
    
    /**
     * Create a new Cloud1D
     */
    public Cloud1D() {
        super("","",1,0,"");
    }
    
    /**
     * Create a new Cloud1D
     * @param name  The Cloud's name.
     * @param title The Cloud's title.
     * @param nMax  The maximum number of entries stored in the Cloud. If nMax is greater than zero the Cloud
     *              will be converted to an Histogram when the number of entries is more than nMax.
     * @param options Some options.
     *
     */
    protected Cloud1D(String name,String title,int nMax,String options) {
        super(name,title,1,nMax,options);
    }
    
    /**
     * Fill the Cloud with a new value with unit weight
     * @param value The value to add to the Cloud.
     * @return true if the fill was successful.
     *
     */
    public void fill(double value) {
        fill(value,1.0);
    }
    /**
     * Fill the Cloud with a new value with given weight
     * @param value The value to add to the Cloud.
     * @param weight The value's weight.
     * @return true if the fill was successful.
     *
     */
    public void fill(double value, double weight) {
        if (nEntries == 0) {
            lowerEdge = upperEdge=value;
        }
        else {
            if (valueupperEdge) upperEdge=value;
        }
        
        if ( histo != null ) {
            histo.fill(value,weight);
        } else if ( autoConvert() && nEntries == maxEntries ) {
            if ( histo != null ) throw new RuntimeException("Cloud already been converted");
            histo= toShowableHistogram(conversionBins(), conversionLowerEdge(), conversionUpperEdge());
            histo.fill(value,weight);
            values = null;
            weights = null;
            valuesArray.clear();
            weightsArray.clear();
            valuesArray = null;
            weightsArray = null;
        } else {
            if ( nEntries%arraySize == 0 ) {
                values  = new double[ arraySize ];
                weights = new double[ arraySize ];
                valuesArray.add( values );
                weightsArray.add( weights );
            }
            
            values[ nEntries%arraySize ] = value;
            weights[ nEntries%arraySize ] = weight;
            if ( ( !Double.isNaN(value) ) && ( !Double.isNaN(weight) ) ) {
                sumOfWeights += weight;
                mean += value*weight;
                rms += value*value*weight;
                validEntries++;
            }
            nEntries++;
            //            if ( nEntries > maxEntries && maxEntries > 0 ) throw new IllegalArgumentException();
        }
        if (isValid) fireStateChanged();
    }
    
    /**
     * Get the Cloud's lower edge.
     * @return The Cloud's lower edge.
     *
     */
    public double lowerEdge() {
        return lowerEdge;
    }
    /**
     * Get the Cloud's upper edge.
     * @return The Cloud's upper edge.
     *
     */
    public double upperEdge() {
        return upperEdge;
    }
    /**
     * Set the Cloud's upper edge
     * @param upperEdge The Cloud's upper edge.
     *
     */
    public void setUpperEdge( double upperEdge ) {
        this.upperEdge = upperEdge;
    }
    /**
     * Set the Cloud's lower edge
     * @param lowerEdge The Cloud's lower edge.
     *
     */
    public void setLowerEdge( double lowerEdge ) {
        this.lowerEdge = lowerEdge;
    }
    /**
     * Get a given value from the Cloud.
     * @param index The value's index.
     * @return The Cloud's corresponding value.
     * @exception RuntimeException if the Cloud has been converted
     *
     */
    public double value(int index) {
        if (histo!=null) throw new RuntimeException("Cloud has been converted");
        double[] val = (double[])valuesArray.get( index/arraySize );
        return val[index%arraySize];
    }
    /**
     * Get a given weight from the Cloud.
     * @param index The weight's index.
     * @return The Cloud's corresponding weight.
     * @exception RuntimeException if the Cloud has been converted
     *
     */
    public double weight(int index) {
        if (histo!=null) throw new RuntimeException("Cloud has been converted");
        double[] val = (double[])weightsArray.get( index/arraySize );
        return val[index%arraySize];
    }
    /**
     * Get the Cloud's mean.
     * @return The Cloud's mean.
     *
     */
    public double mean() {
        if ( histo != null ) return histo.mean();
        return mean / sumOfWeights();
    }
    /**
     * Get the Cloud's rms.
     * @return The Cloud's rms.
     *
     */
    public double rms() {
        if ( histo != null ) return histo.rms();
        return Math.sqrt( rms / sumOfWeights() - mean*mean/sumOfWeights()/sumOfWeights() );
    }
    /**
     * Get the Cloud's entries.
     * @return The Cloud's entries.
     *
     */
    public int entries() {
        if ( histo != null ) return histo.allEntries();
        return nEntries;
    }
    /**
     * Represent the Cloud as a Histogram.
     * @param nBins The Histogram's number of bins.
     * @param lowerEdge The Histogram's lower edge.
     * @param upperEdge The Histogram's upper edge.
     * @return The Histogram representing the Cloud.
     *
     */
    private IHistogram1D toShowableHistogram(int nBins, double lowerEdge, double upperEdge) {
        if ( histo != null ) return histo;
        return HistUtils.toShowableHistogram(this, nBins, lowerEdge, upperEdge);
    }
    
    /**
     * Convert the ICloud to an IHistogram.
     *
     */
    public void convert(int nBins, double lowerEdge, double upperEdge) {
        if ( histo != null ) throw new RuntimeException("Cloud already been converted");
        histo= toShowableHistogram(nBins, lowerEdge, upperEdge);
        if (isValid) fireStateChanged();
    }
    
    /**
     * Convert the ICloud to an IHistogram by specifying the bin edges.
     *
     */
    public void convert( double[] binEdges ) {
        if ( histo != null ) throw new RuntimeException("Cloud already been converted");
        IHistogram1D hist = new Histogram1D(name(),title(),new VariableAxis(binEdges));
        for(int i=0; itrue<\code> if the Cloud has been converted to a Histogram.
     *
     */
    public boolean isConverted() {
        return histo != null ? true : false;
    }
    /**
     * Get the Histogram representing the Cloud
     * @return the histogram.
     * @exception RuntimeException if the histogram is not auto-convertible and "convert"
     * has not been called.
     */
    public IHistogram1D histogram() throws RuntimeException {
        if ( histo == null ) throw new RuntimeException("Cloud has not been converted");
        return histo;
    }
    /**
     * Set the Histogram representation of the Cloud.
     * @param hist The Histogram representing the Cloud.
     *
     */
    public void setHistogram( IHistogram1D hist ) {
        if ( histo != null ) throw new RuntimeException("Cloud already been converted");
        histo = hist;
        if (isValid) fireStateChanged();
    }
    
    public void fillHistogram(hep.aida.IHistogram1D hist1d) {
        if ( histo != null ) throw new IllegalArgumentException("Cloud has already been converted");
        for(int i=0; i