package dsp.filter.design;

import dsp.filter.fir.FIRFilterSpecification;
import dsp.filter.fir.remez.RemezFIRFilterDesigner;
import javafx.application.Application;
import javafx.scene.Scene;
import javafx.stage.Stage;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

public class FilterViewer extends Application
{
    private final static Logger mLog = LoggerFactory.getLogger(FilterViewer.class);

    /**
     * Developer tool to visualize filter designs
     */
    public FilterViewer()
    {
    }

    @Override
    public void start(Stage primaryStage) throws Exception
    {
        Scene scene = new Scene(new FilterView(getFilter()));

        primaryStage.setTitle("Filter Viewer");
        primaryStage.setScene(scene);
        primaryStage.show();
    }

    public static void main(String[] args)
    {
        launch(args);
    }

    /**
     * Provides the filter to visualize.  Modify this method to visualize your filter design.
     */
    private float[] getFilter()
    {
        FIRFilterSpecification specification = FIRFilterSpecification.lowPassBuilder()
            .sampleRate(48000)
            .gridDensity(16)
            .passBandCutoff(2500)
            .passBandAmplitude(1.0)
            .passBandRipple(0.01)
            .stopBandStart(4000)
            .stopBandAmplitude(0.0)
            .stopBandRipple(0.008)
            .build();

//        FIRFilterSpecification specification = FIRFilterSpecification.highPassBuilder()
//            .sampleRate(24000)
//            .stopBandCutoff(800)
//            .stopBandAmplitude(0.0)
//            .stopBandRipple(0.03)
//            .passBandStart(1000)
//            .passBandAmplitude(1.0)
//            .passBandRipple(0.08)
//            .build();

//		FIRFilterSpecification specification = FIRFilterSpecification.bandPassBuilder()
//	        .sampleRate( 48000 )
//	        .stopFrequency1( 200 )
//	        .passFrequencyBegin( 400 )
//	        .passFrequencyEnd( 3200 )
//	        .stopFrequency2( 3400 )
//	        .stopRipple( 0.0003 )
//	        .passRipple( 0.008)
//	        .build();

        float[] taps = null;

//        taps = FilterFactory.getLowPass(48000, 6750, 7500, 60,
//            Window.WindowType.HAMMING, true);

        try
        {
            RemezFIRFilterDesigner designer = new RemezFIRFilterDesigner(specification);

            if(designer.isValid())
            {
                taps = designer.getImpulseResponse();
            }
        }
        catch(FilterDesignException fde)
        {
            mLog.error("Filter design error", fde);
        }

        return taps;
    }
}