/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 * 
 */

package org.apache.jmeter.visualizers;

import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Dimension;
import java.awt.Graphics;
import java.awt.GridLayout;
import java.awt.Image;

import javax.swing.BorderFactory;
import javax.swing.JComponent;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.border.Border;
import javax.swing.border.EmptyBorder;

import org.apache.jmeter.samplers.Clearable;
import org.apache.jmeter.samplers.SampleResult;
import org.apache.jmeter.util.JMeterUtils;
import org.apache.jmeter.visualizers.gui.AbstractVisualizer;
import org.apache.jorphan.gui.layout.VerticalLayout;

/**
 * This class implements a statistical analyser that takes samples to process a
 * Spline interpolated curve. Currently, it tries to look mostly like the
 * GraphVisualizer.
 * 
 */
public class SplineVisualizer extends AbstractVisualizer implements ImageVisualizer, GraphListener, Clearable {

	private static final String SUFFIX_MS = " ms";  //$NON-NLS-1$

	protected final Color BACKGROUND_COLOR = getBackground();

	protected final Color MINIMUM_COLOR = new Color(0F, 0.5F, 0F);

	protected final Color MAXIMUM_COLOR = new Color(0.9F, 0F, 0F);

	protected final Color AVERAGE_COLOR = new Color(0F, 0F, 0.75F);

	protected final Color INCOMING_COLOR = Color.black;

	protected final int NUMBERS_TO_DISPLAY = 4;

	protected final boolean FILL_UP_WITH_ZEROS = false;

	private transient SplineGraph graph = null;

	private JLabel minimumLabel = null;

	private JLabel maximumLabel = null;

	private JLabel averageLabel = null;

	private JLabel incomingLabel = null;

	private JLabel minimumNumberLabel = null;

	private JLabel maximumNumberLabel = null;

	private JLabel averageNumberLabel = null;

	private JLabel incomingNumberLabel = null;

	private transient SplineModel model;

	public SplineVisualizer() {
		super();
		model = new SplineModel();
		graph = new SplineGraph();
		this.model.setListener(this);
		setGUI();
	}

	public void add(SampleResult res) {
		model.add(res);
	}

	public String getLabelResource() {
		return "spline_visualizer_title"; //$NON-NLS-1$
	}

	public void updateGui(Sample s) {
		updateGui();
	}

	public void clearData() {
		model.clearData();
	}

	private void setGUI() {
		Color backColor = BACKGROUND_COLOR;

		this.setBackground(backColor);

		this.setLayout(new BorderLayout());

		// MAIN PANEL
		JPanel mainPanel = new JPanel();
		Border margin = new EmptyBorder(10, 10, 5, 10);

		mainPanel.setBorder(margin);
		mainPanel.setLayout(new VerticalLayout(5, VerticalLayout.BOTH));

		// NAME
		mainPanel.add(makeTitlePanel());

		maximumLabel = new JLabel(JMeterUtils.getResString("spline_visualizer_maximum")); //$NON-NLS-1$
		maximumLabel.setForeground(MAXIMUM_COLOR);
		maximumLabel.setBackground(backColor);

		averageLabel = new JLabel(JMeterUtils.getResString("spline_visualizer_average")); //$NON-NLS-1$
		averageLabel.setForeground(AVERAGE_COLOR);
		averageLabel.setBackground(backColor);

		incomingLabel = new JLabel(JMeterUtils.getResString("spline_visualizer_incoming")); //$NON-NLS-1$
		incomingLabel.setForeground(INCOMING_COLOR);
		incomingLabel.setBackground(backColor);

		minimumLabel = new JLabel(JMeterUtils.getResString("spline_visualizer_minimum")); //$NON-NLS-1$
		minimumLabel.setForeground(MINIMUM_COLOR);
		minimumLabel.setBackground(backColor);

		maximumNumberLabel = new JLabel("0 ms"); //$NON-NLS-1$
		maximumNumberLabel.setHorizontalAlignment(JLabel.RIGHT);
		maximumNumberLabel.setForeground(MAXIMUM_COLOR);
		maximumNumberLabel.setBackground(backColor);

		averageNumberLabel = new JLabel("0 ms"); //$NON-NLS-1$
		averageNumberLabel.setHorizontalAlignment(JLabel.RIGHT);
		averageNumberLabel.setForeground(AVERAGE_COLOR);
		averageNumberLabel.setBackground(backColor);

		incomingNumberLabel = new JLabel("0 ms"); //$NON-NLS-1$
		incomingNumberLabel.setHorizontalAlignment(JLabel.RIGHT);
		incomingNumberLabel.setForeground(INCOMING_COLOR);
		incomingNumberLabel.setBackground(backColor);

		minimumNumberLabel = new JLabel("0 ms"); //$NON-NLS-1$
		minimumNumberLabel.setHorizontalAlignment(JLabel.RIGHT);
		minimumNumberLabel.setForeground(MINIMUM_COLOR);
		minimumNumberLabel.setBackground(backColor);

		// description Panel
		JPanel labelPanel = new JPanel();

		labelPanel.setLayout(new GridLayout(0, 1));
		labelPanel.setBorder(BorderFactory.createEmptyBorder(0, 0, 0, 20));
		labelPanel.setBackground(backColor);
		labelPanel.add(maximumLabel);
		labelPanel.add(averageLabel);
		if (model.SHOW_INCOMING_SAMPLES) {
			labelPanel.add(incomingLabel);
		}
		labelPanel.add(minimumLabel);
		// number Panel
		JPanel numberPanel = new JPanel();

		numberPanel.setLayout(new GridLayout(0, 1));
		numberPanel.setBorder(BorderFactory.createEmptyBorder(0, 0, 0, 20));
		numberPanel.setBackground(backColor);
		numberPanel.add(maximumNumberLabel);
		numberPanel.add(averageNumberLabel);
		if (model.SHOW_INCOMING_SAMPLES) {
			numberPanel.add(incomingNumberLabel);
		}
		numberPanel.add(minimumNumberLabel);
		// information display Panel
		JPanel infoPanel = new JPanel();

		infoPanel.setLayout(new BorderLayout());
		infoPanel.add(labelPanel, BorderLayout.CENTER);
		infoPanel.add(numberPanel, BorderLayout.EAST);

		this.add(mainPanel, BorderLayout.NORTH);
		this.add(infoPanel, BorderLayout.WEST);
		this.add(graph, BorderLayout.CENTER);
		// everyone is free to swing on its side :)
		// add(infoPanel, BorderLayout.EAST);
	}

	public void updateGui() {
		repaint();
		synchronized (this) {
			setMinimum(model.getMinimum());
			setMaximum(model.getMaximum());
			setAverage(model.getAverage());
			setIncoming(model.getCurrent());
		}
	}

	public String toString() {
		return "Show the samples analysis as a Spline curve";
	}

	private String formatMeasureToDisplay(long measure) {
		String numberString = String.valueOf(measure);

		if (FILL_UP_WITH_ZEROS) {
			for (int i = numberString.length(); i < NUMBERS_TO_DISPLAY; i++) {
				numberString = "0" + numberString; //$NON-NLS-1$
			}
		}
		return numberString;
	}

	private void setMinimum(long n) {
		String text = this.formatMeasureToDisplay(n) + SUFFIX_MS;

		this.minimumNumberLabel.setText(text);
	}

	private void setMaximum(long n) {
		String text = this.formatMeasureToDisplay(n) + SUFFIX_MS;

		this.maximumNumberLabel.setText(text);
	}

	private void setAverage(long n) {
		String text = this.formatMeasureToDisplay(n) + SUFFIX_MS; 

		this.averageNumberLabel.setText(text);
	}

	private void setIncoming(long n) {
		String text = this.formatMeasureToDisplay(n) + SUFFIX_MS;

		this.incomingNumberLabel.setText(text);
	}

	public JPanel getControlPanel() {// TODO - is this needed?
		return this;
	}

	public Image getImage() {
		Image result = graph.createImage(graph.getWidth(), graph.getHeight());

		graph.paintComponent(result.getGraphics());

		return result;
	}

	/**
	 * Component showing a Spline curve.
	 * 
	 */
	public class SplineGraph extends JComponent {
		public boolean reinterpolated = false;

		protected final Color WAITING_COLOR = Color.darkGray;

		protected int lastWidth = -1;

		protected int lastHeight = -1;

		protected int[] plot = null;

		public SplineGraph() {
		}

		/**
		 * Clear the Spline graph and get ready for the next wave.
		 */
		public void clear() {
			lastWidth = -1;
			lastHeight = -1;
			plot = null;
			this.repaint();
		}

		public void paintComponent(Graphics g) {
			super.paintComponent(g);

			Dimension dimension = this.getSize();
			int width = dimension.width;
			int height = dimension.height;

			if (model.getDataCurve() == null) {
				g.setColor(this.getBackground());
				g.fillRect(0, 0, width, height);
				g.setColor(WAITING_COLOR);
				g.drawString(JMeterUtils.getResString("spline_visualizer_waitingmessage"),  //$NON-NLS-1$
						(width - 120) / 2, height - (height - 12) / 2);
				return;
			}

			// boolean resized = true;

			if (width == lastWidth && height == lastHeight) {
				// dimension of the SplineGraph is the same
				// resized = false;
			} else {
				// dimension changed
				// resized = true;
				lastWidth = width;
				lastHeight = height;
			}

			this.plot = model.getDataCurve().getPlots(width, height); // rounds!

			int n = plot.length;
			int curY = plot[0];

			for (int i = 1; i < n; i++) {
				g.setColor(Color.black);
				g.drawLine(i - 1, height - curY - 1, i, height - plot[i] - 1);
				curY = plot[i];
			}
		}
	}
}
