package org.das2.graph;

import java.awt.Color;
import java.awt.Component;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.Rectangle;
import java.beans.PropertyChangeEvent;
import java.beans.PropertyChangeListener;
import java.util.logging.Level;
import java.util.logging.Logger;
import org.das2.datum.Datum;
import org.das2.datum.DatumRange;
import org.das2.datum.DatumVector;
import org.das2.datum.DomainDivider;
import org.das2.datum.DomainDividerUtil;
import org.das2.datum.Units;
import org.das2.datum.UnitsUtil;
import org.das2.datum.format.DatumFormatter;
import org.das2.util.GrannyTextRenderer;
import org.das2.util.LoggerManager;
import org.das2.qds.DataSetOps;
import org.das2.qds.DataSetUtil;
import org.das2.qds.QDataSet;
import org.das2.qds.SemanticOps;
import org.das2.qds.ops.Ops;
import org.das2.qds.util.DataSetBuilder;

/**
 * This is like a TCA, but is an axis which has ticks positioned by another axis.
 * @author jbf
 */
public class LookupAxis extends DasCanvasComponent {
    
    private static final Logger logger= LoggerManager.getLogger("org.das2.graph.lookupaxis" );
    /**
     * the width of the component.
     */
    int maxWidth;
    
    /**
     * the height of the component.
     */
    int maxHeight;
    
    DasAxis axis;
    
    QDataSet tt;
    QDataSet ff;
    
    QDataSet xpos;
    QDataSet fpos;
    QDataSet xposMinor;
    QDataSet fposMinor;
    DatumFormatter format;
        
    public LookupAxis( DasAxis axis ) {
        this.maxWidth=100;
        this.maxHeight=100;
        setAxis(axis);
    }
    
    public void setDataSet( QDataSet yy ) {
        this.tt= SemanticOps.xtagsDataSet(yy);
        this.ff= yy;
    }

    public void setDataSet( QDataSet xx, QDataSet yy ) {
        this.tt= xx;
        this.ff= yy;
    }
    
    /**
     * set the axis.  This must be in units convertible to xx.
     * This must be a vertical axis with ticks on the left side, for now.
     * @param axis the axis.
     */
    public void setAxis( DasAxis axis ) {
        axis.addPropertyChangeListener( updateListener );
        this.axis= axis;
        
    }
    
    private final PropertyChangeListener updateListener= new PropertyChangeListener() {
        @Override
        public void propertyChange(PropertyChangeEvent evt) {
            LookupAxis.this.resize();
            try {
                LookupAxis.this.updateTicks();
            } catch ( Exception e ){ 
                logger.log( Level.WARNING, null, e );
            }
            //LookupAxis.this.repaint();
            
        }
    };

    @Override
    protected void uninstallComponent() {
        if ( this.axis!=null ) {
            this.axis.removePropertyChangeListener(updateListener);
        }
    }
    
    
    /**
     * return the X positions of the Y value.
     * TODO: Rewrite this.  IDL-like code makes this impossible to read.
     * @param y the Y value
     * @param xx the monotonically increasing tags
     * @param yy rank 1 function of xx
     * @return the X positions of the Y value.
     */
    private static QDataSet interpWow( Datum y, QDataSet xx, QDataSet yy ) {
        QDataSet zipzip= Ops.multiply( Ops.subtract(y, yy.trim(0,yy.length()-1) ), Ops.subtract( yy.trim(1,yy.length()), y ) );
        QDataSet r= Ops.where( Ops.ge( zipzip, 0 ) ); // find the points which bracket y.
        //QDataSet t1= Ops.subtract( y, DataSetOps.applyIndex( yy, 0, r, false ) );
        //QDataSet t0= DataSetOps.applyIndex( yy, Ops.add( r,1 ) );
        //QDataSet t2= Ops.subtract( DataSetOps.applyIndex( yy, Ops.add( r,1 ) ), DataSetOps.applyIndex( yy, r ) );
        
        QDataSet div= Ops.subtract( DataSetOps.applyIndex( yy, Ops.add(r,1) ), DataSetOps.applyIndex( yy,r ) );
        QDataSet ff= Ops.divide( Ops.subtract( Ops.dataset(y),                            DataSetOps.applyIndex( yy,r ) ) , 
                                 div );
        QDataSet rzero= Ops.where( Ops.eq( Ops.abs(div), 0 ) );
        if ( rzero.length()>0 ) throw new IllegalArgumentException("yy cannot have repeating values");

        if ( UnitsUtil.isIntervalMeasurement( SemanticOps.getUnits(xx) ) ) {            
            return Ops.interpolate( xx, ff );
            //return Ops.add( Ops.multiply( DataSetOps.applyIndex( xx,r ), Ops.subtract(1,ff) ), 
            //            Ops.multiply( DataSetOps.applyIndex( xx,Ops.add(r,1)), ff ) );            
        } else {
            return Ops.add( Ops.multiply( DataSetOps.applyIndex( xx,r ), Ops.subtract(1,ff) ), 
                        Ops.multiply( DataSetOps.applyIndex( xx,Ops.add(r,1)), ff ) );
        }
    }
    
    private void drawMessage( Graphics g1, String message ) {
        Graphics2D g= (Graphics2D)g1;
        Rectangle r= getBounds();
        g.setColor( Color.GRAY );
        g.fillRoundRect( 0, 0, r.width-1, r.height-1,7,7 );
        g.setColor( Color.BLACK );
        g.drawRoundRect( 0, 0, r.width-1, r.height-1,7,7 );
        g.drawString( message, 0, g.getFont().getSize() );
    }
    
    @Override
    public void paintComponent( Graphics g ) {
        TickVDescriptor tickV= axis.tickV;
        if ( tickV==null ) return;
        
        DatumVector ticks= tickV.getMinorTicks();

        if ( tt==null ) {
            drawMessage( g,"no times" );
            return;
        }
        if ( ff==null ) {
            drawMessage( g,"no data" );
            return;
        }

        if ( !SemanticOps.getUnits(tt).isConvertibleTo(ticks.getUnits() ) ) {
            if ( UnitsUtil.isTimeLocation(SemanticOps.getUnits(tt)) ) {
                drawMessage( g,"inconvertible units" );
                return;
            } else {
                tt= Ops.putProperty(tt, QDataSet.UNITS, ticks.getUnits() );
            }
        }
                
        g.setColor( Color.BLACK );
        int ascent= g.getFontMetrics().getAscent();
        int height= this.getHeight();
        
        int myY= this.getY();
        int myX= this.getX();

        maxWidth= 0;
        maxHeight= 0;
        
        if ( xpos==null ) {
            try {
                updateTicks();
            } catch ( RuntimeException ex ) {
                logger.info( ex.getMessage() );
                drawMessage( g,"error while updating ticks: "+ex.getMessage() );
                return;
            }
        }
        
        if ( xpos==null ) {
            drawMessage( g,"no ticks found!" );
            return;
        }
        
        //draw the major ticks
            for ( int j=0; j<xpos.length(); j++ ) {
                int ix0= -999;
                QDataSet d = xpos.slice(j);
                int ix = (int)axis.transform( d );
                if ( ix==ix0 ) continue;
                ix0= ix;
                if ( axis.isHorizontal() ) {
                    if ( ix<getColumn().getDMinimum() ) continue;
                    if ( ix>getColumn().getDMaximum() ) continue;
                    g.drawLine( ix-myX, height+1, ix-myX, height-5 );
                } else {
                    if ( ix<getRow().getDMinimum() ) continue;
                    if ( ix>getRow().getDMaximum() ) continue;
                    g.drawLine( 0, ix-myY, 5, ix-myY );
                }
                GrannyTextRenderer gtr= new GrannyTextRenderer( );
                gtr.setString( g, format.format( DataSetUtil.asDatum(fpos.slice(j)) ) );
                if ( axis.isHorizontal() ) {
                    gtr.draw( g, ix - myX - (int)gtr.getWidth()/2, height-5-3 );
                    int height0= (int)gtr.getHeight()+8;
                    if ( height0>maxHeight ) maxHeight=height0;              
                } else {
                    gtr.draw( g, 5+3, ix+ascent/2-myY );
                    int width0= (int)gtr.getWidth();
                    if ( width0>maxWidth ) maxWidth=width0;
                }
            }
        
        maxHeight= Math.max( maxHeight, 6 );
        maxWidth= Math.max( maxWidth, 6 );
        
        // draw the minor ticks
            g.setColor( Color.BLACK );
            myY= this.getY();
            int ix0= -999;
            for ( int j=0; j<xposMinor.length(); j++ ) {
                QDataSet d = xposMinor.slice(j);
                int ix = (int) axis.transform( d );
                if ( ix==ix0 ) continue;
                ix0= ix;
                if ( axis.isHorizontal() ) {
                    g.drawLine( ix-myX, height+1, ix-myX, height-3 );
                } else {
                    g.drawLine( 0, ix-myY, 3, ix-myY ); 
                }
            }
    }
    
    /**
     * the axis has changed, so update the tick positions.
     * preconditions: the axis ticks have changed.
     * postconditions: new x values have been calculated in xpos and fpos
     */
    public void updateTicks() {
        TickVDescriptor tickV= axis.tickV;
        if ( tickV==null ) return;
        
        DatumVector ticks= tickV.getMinorTicks();
        Datum fmin= Ops.datum(1e20);
        Datum fmax= Ops.datum(-1e20);

        if ( tt==null ) {
            logger.fine("no xtags");
            return;
        }
        if ( ff==null ) {
            logger.fine( "no data" );
            return;
        }
        
        if ( !SemanticOps.getUnits(tt).isConvertibleTo(ticks.getUnits() ) ) {
            if ( UnitsUtil.isTimeLocation(SemanticOps.getUnits(tt)) ) {
                logger.fine( "inconvertible units" );
                return;
            } else {
                tt= Ops.putProperty(tt, QDataSet.UNITS, ticks.getUnits() );
            }
        }
        
        // calculate the min and max values seen, at each of the axis minor tick positions.
        DatumRange axisRange= axis.getDatumRange();
        for ( int i=0; i<ticks.getLength(); i++ ) {
            Datum x= ticks.get(i);
            if ( !axisRange.contains(x) ) continue;
            QDataSet f= Ops.findex(tt, Ops.dataset(x) );
            if ( f.value()>0 && f.value()<tt.length() ) {
                QDataSet ffint= Ops.interpolate(ff, f );
                if ( Ops.valid(ffint).value()!=0 ) {
                    fmin= Ops.datum( Ops.lesserOf( fmin, ffint ) );
                    fmax= Ops.datum( Ops.greaterOf( fmax, ffint ) );
                }
            }
        }
        if ( fmin.ge(fmax) ) {
            logger.fine("no ticks visible");
            return;
        }
        
        DomainDivider ytickvdd= DomainDividerUtil.getDomainDivider( Ops.datum(fmin),Ops.datum(fmax) );
        while (  ytickvdd.boundaryCount( fmin, fmax )<10 ) {
            DomainDivider dd= ytickvdd.finerDivider(false);
            if ( dd==null ) break;
            ytickvdd= dd;
        }
        while (  ytickvdd.boundaryCount( fmin, fmax )>20 ) {
            DomainDivider dd= ytickvdd.coarserDivider(false);
            if ( dd==null ) break;
            ytickvdd= dd;
        }

        ticks= ytickvdd.boundaries( fmin, fmax );

        DatumRange dr= new DatumRange(fmin,fmax);
        format= DomainDividerUtil.getDatumFormatter(ytickvdd,dr);

        maxWidth= 0;
        maxHeight= 0;
        
        DataSetBuilder xposBuilder= new DataSetBuilder(1,100);
        DataSetBuilder fposBuilder= new DataSetBuilder(1,100);
        
        //calculate the major ticks
        for ( int i=0; i<ticks.getLength(); i++ ) {
            Datum atick= ticks.get(i);
            QDataSet dds= interpWow(atick, tt, ff );
            int ix0= -999;
            for ( int j=0; j<dds.length(); j++ ) {
                QDataSet d = dds.slice(j);
                int ix = (int)axis.transform( d );
                if ( ix==ix0 ) continue;
                ix0= ix;
                if ( axis.isHorizontal() ) {
                    if ( ix<getColumn().getDMinimum() ) continue;
                    if ( ix>getColumn().getDMaximum() ) continue;
                    xposBuilder.nextRecord(d);
                    fposBuilder.nextRecord(atick);

                } else {
                    if ( ix<getRow().getDMinimum() ) continue;
                    if ( ix>getRow().getDMaximum() ) continue;
                    xposBuilder.nextRecord(d);
                    fposBuilder.nextRecord(atick);
                }
            }
        } 
           
        DataSetBuilder xposMinorBuilder= new DataSetBuilder(1,100);
        DataSetBuilder fposMinorBuilder= new DataSetBuilder(1,100);
        
        // draw the minor ticks
        ticks= ytickvdd.finerDivider( true ).boundaries( fmin, fmax );
        for (  int i=0; i<ticks.getLength(); i++ ) {
            Datum atick= ticks.get(i);
            QDataSet dds= interpWow(atick, tt, ff );
            int ix0= -999;
            for ( int j=0; j<dds.length(); j++ ) {
                QDataSet d = dds.slice(j);
                int ix = (int) axis.transform( d );
                if ( ix==ix0 ) continue;
                ix0= ix;
                if ( axis.isHorizontal() ) {
                    if ( ix<getColumn().getDMinimum() ) continue;
                    if ( ix>getColumn().getDMaximum() ) continue;
                    xposMinorBuilder.nextRecord(d);
                    fposMinorBuilder.nextRecord(atick);

                } else {
                    if ( ix<getRow().getDMinimum() ) continue;
                    if ( ix>getRow().getDMaximum() ) continue;
                    xposMinorBuilder.nextRecord(d);
                    fposMinorBuilder.nextRecord(atick);
                }
            }
        }
        
        xpos= xposBuilder.getDataSet();
        fpos= fposBuilder.getDataSet();

        xposMinor= xposMinorBuilder.getDataSet();
        fposMinor= fposMinorBuilder.getDataSet();
        
    }
    
    @Override
    public void resize() {
        if ( getColumn()==null || getColumn().getParent()==null ) { 
             return;
        }
        if ( maxHeight<6 ) maxHeight=6;
        if ( maxWidth<6 ) maxWidth=6;
        
        if ( axis.isHorizontal() ) {
            int x= getColumn().getDMinimum();
            int y= getRow().getDMinimum();
            Rectangle rect= new Rectangle( x, y-this.maxHeight, getColumn().getWidth(), this.maxHeight );
            this.setBounds( rect );            
        } else {
            int x= getColumn().getDMaximum();
            int y= getRow().getDMinimum();
            Rectangle rect= new Rectangle( x, y, this.maxWidth, this.getRow().getHeight() );
            this.setBounds( rect );
        }
    }
}