package de.intevation.flys.artifacts.charts;

import de.intevation.flys.backend.SessionFactoryProvider;

import de.intevation.flys.geom.Lines;

import de.intevation.flys.model.CrossSection;
import de.intevation.flys.model.CrossSectionLine;
import de.intevation.flys.model.CrossSectionPoint;

import de.intevation.flys.utils.Pair;

import java.awt.BorderLayout;
import java.awt.Dimension;
import java.awt.FlowLayout;

import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.ItemEvent;
import java.awt.event.ItemListener;

import java.awt.geom.Point2D;

import java.io.File;
import java.io.FileWriter;
import java.io.IOException;
import java.io.PrintWriter;

import java.math.MathContext;

import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import java.util.Map;
import java.util.TreeMap;

import javax.swing.DefaultComboBoxModel;
import javax.swing.JButton;
import javax.swing.JComboBox;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTable;
import javax.swing.JTextField;

import javax.swing.event.TableModelEvent;
import javax.swing.event.TableModelListener;

import javax.swing.table.AbstractTableModel;

import org.hibernate.Query;
import org.hibernate.Session;

import org.jfree.chart.ChartFactory;
import org.jfree.chart.ChartPanel;
import org.jfree.chart.ChartUtilities;
import org.jfree.chart.JFreeChart;

import org.jfree.chart.axis.NumberAxis;

import org.jfree.chart.plot.PlotOrientation;
import org.jfree.chart.plot.XYPlot;

import org.jfree.data.xy.XYSeries;
import org.jfree.data.xy.XYSeriesCollection;

import org.jfree.ui.ApplicationFrame;
import org.jfree.ui.RefineryUtilities;

public class CrossSectionApp
extends      ApplicationFrame
{
    public static final String RIVER = System.getProperty("river", "Saar");

    public static final double EPSILON   = 1e-4;

    protected Session session;

    protected JComboBox crossSectionLinesCB;
    protected JTextField waterlevelTF;

    protected ChartPanel chartPanel;

    protected Double lastWaterLevel;

    protected List<CrossSection> crossSections;
    protected boolean [] drawCrossSection;
    protected boolean [] drawWaterLevel;
    protected boolean [] drawGround;

    protected Map<Double, List<Pair<CrossSection, CrossSectionLine>>> km2lines;

    public class CrossSectionTableModel extends AbstractTableModel {

        @Override
        public String getColumnName(int col) {
            switch (col) {
                case 0: return "Peilungsname";
                case 1: return "Peilung";
                case 2: return "Wasserstand";
                case 3: return "Boden";
            }
            return "";
        }

        @Override
        public int getColumnCount() {
            return 4; 
        }

        @Override
        public int getRowCount() {
            return crossSections != null ? crossSections.size() : 0;
        }

        @Override
        public Object getValueAt(int row, int col) {
            if (crossSections == null) return null;
            switch (col) {
                case 0: return crossSections.get(row).getDescription();
                case 1: return drawCrossSection[row];
                case 2: return drawWaterLevel[row];
                case 3: return drawGround[row];
            }
            return null;
        }

        @Override
        public void setValueAt(Object value, int row, int col) {
            switch (col) {
                case 1: 
                    if (change(drawCrossSection, row, (Boolean)value)) {
                        fireTableCellUpdated(row, col);
                    }
                    break;
                case 2:
                    if (change(drawWaterLevel, row, (Boolean)value)) {
                        fireTableCellUpdated(row, col);
                    }
                    break;
                case 3:
                    if (change(drawGround, row, (Boolean)value)) {
                        fireTableCellUpdated(row, col);
                    }
                    break;
            }
        }

        @Override
        public Class<?> getColumnClass(int columnIndex) {
            switch (columnIndex) {
                case 0: return String.class;
                case 1: return Boolean.class;
                case 2: return Boolean.class;
                case 3: return Boolean.class;
            }
            return null;
        }

        @Override
        public boolean isCellEditable(
            int rowIndex,
            int columnIndex
        ) {
            return columnIndex >= 1 && columnIndex <= 3;
        }
    } // class CrossSectionTableModel

    private static boolean change(
        boolean [] values,
        int        index, 
        boolean    value
    ) {
        if (values[index] != value) {
            values[index] = value;
            return true;
        }
        return false;
    }

    public static class CrossSectionLineItem {

        Double km;
        List<Pair<CrossSection, CrossSectionLine>> lines;

        public CrossSectionLineItem(
            Double km, 
            List<Pair<CrossSection, CrossSectionLine>> lines
        ) {
            this.km    = km;
            this.lines = lines;
        }

        public String toString() {
            return String.valueOf(km);
        }
    } // CrossSectionLineItem

    public CrossSectionApp(String title) {
        super(title);

        session = SessionFactoryProvider
            .createSessionFactory()
            .openSession();

        JPanel content = createContent();
        content.setPreferredSize(new Dimension(800, 480));
        setContentPane(content);

    }

    public List<CrossSection> crossSections(String river) {
        Query query = session.createQuery(
            "from CrossSection where river.name = :river");
        query.setParameter("river", river);
        return query.list();
    }

    protected Map<Double, List<Pair<CrossSection, CrossSectionLine>>> loadAllLines(
        List<CrossSection> crossSections
    ) {
        Map<Double, List<Pair<CrossSection, CrossSectionLine>>> km2lines =
            new TreeMap<Double, List<Pair<CrossSection, CrossSectionLine>>>();
        for (CrossSection cs: crossSections) {
            List<CrossSectionLine> lines = cs.getLines();
            for (CrossSectionLine csl: lines) {
                Double km = Math.round(csl.getKm().doubleValue() * 1000d)/1000d;
                List<Pair<CrossSection, CrossSectionLine>> ls = km2lines.get(km);
                if (ls == null) {
                    ls = new ArrayList<Pair<CrossSection, CrossSectionLine>>(2);
                    km2lines.put(km, ls);
                }
                ls.add(new Pair<CrossSection, CrossSectionLine>(cs, csl));
            }
        }
        return km2lines;
    }

    public JPanel createContent() {
        JPanel panel = new JPanel(new BorderLayout());


        JPanel nav = new JPanel(new FlowLayout());

        crossSections = crossSections(RIVER);
        km2lines = loadAllLines(crossSections);
        drawCrossSection = new boolean[crossSections.size()];
        Arrays.fill(drawCrossSection, true);

        drawWaterLevel = new boolean[crossSections.size()];
        drawGround     = new boolean[crossSections.size()];

        Object [] clis = createCrossSectionLineItems(km2lines);

        DefaultComboBoxModel dcbm = new DefaultComboBoxModel(clis);

        crossSectionLinesCB = new JComboBox(dcbm);

        nav.add(crossSectionLinesCB);

        crossSectionLinesCB.addItemListener(new ItemListener() {
            @Override
            public void itemStateChanged(ItemEvent ie) {
                if (ie.getStateChange() == ItemEvent.SELECTED) {
                    updateChart();
                }
            }
        });

        waterlevelTF = new JTextField(5);

        waterlevelTF.addActionListener(new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent ae) {
                waterLevelChanged();
            }
        });

        nav.add(waterlevelTF);

        JButton dump = new JButton("dump");

        dump.addActionListener(new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent ae) {
                dumpData();
            }
        });

        nav.add(dump);


        chartPanel = createChartPanel();

        panel.add(chartPanel, BorderLayout.CENTER);


        CrossSectionTableModel cstm = new CrossSectionTableModel();

        cstm.addTableModelListener(new TableModelListener() {
            @Override
            public void tableChanged(TableModelEvent e) {
                updateChart();
            }
        });

        JTable crossTable = new JTable(cstm);

        JPanel west = new JPanel(new BorderLayout());
        JScrollPane scrollPane = new JScrollPane(crossTable);
        west.add(scrollPane);

        west.add(nav, BorderLayout.SOUTH);

        panel.add(west, BorderLayout.WEST);

        return panel;
    }

    protected void waterLevelChanged() {
        String value = waterlevelTF.getText();
        try {
            lastWaterLevel = Double.parseDouble(value);
        }
        catch (NumberFormatException nfe) {
            waterlevelTF.setText(
                lastWaterLevel != null ? lastWaterLevel.toString() : "");
            return;
        }
        updateChart();
    }

    protected void updateChart() {

        CrossSectionLineItem csli =
            (CrossSectionLineItem)crossSectionLinesCB.getSelectedItem();

        JFreeChart chart = createChart(csli == null
            ? new XYSeriesCollection()
            : generateDataset());

        chartPanel.setChart(chart);
    }

    protected ChartPanel createChartPanel() {
        CrossSectionLineItem csli =
            (CrossSectionLineItem)crossSectionLinesCB.getSelectedItem();

        JFreeChart chart = createChart(csli == null
            ? new XYSeriesCollection()
            : generateDataset());

        return new ChartPanel(chart);
    }

    protected void dumpData() {

        CrossSectionLineItem csli =
            (CrossSectionLineItem)crossSectionLinesCB.getSelectedItem();

        if (csli == null) {
            return;
        }


        double km = Math.round(csli.km.doubleValue() * 1000d)/1000d;

        String kmS = String.valueOf(km).replace(".", "-");

        int i = 1;
        File file = new File("cross-section-" + kmS + ".txt");
        while (file.exists()) {
            file = new File("cross-section-" + kmS + "[" + (i++) + "].txt");
        }

        System.err.println("dump points to file '" + file + "'");

        PrintWriter out = null;

        MathContext mc = new MathContext(3);

        try {
            out =
                new PrintWriter(
                new FileWriter(file));

            for (Pair<CrossSection, CrossSectionLine> pair: csli.lines) {
                out.println("# " + pair.getA().getDescription());
                for (CrossSectionPoint point: pair.getB().getPoints()) {
                    out.println(
                        point.getX().round(mc) + " " +
                        point.getY().round(mc));
                }
            }

            out.flush();
        }
        catch (IOException ioe) {
            ioe.printStackTrace();
        }
        finally {
            if (out != null) {
                out.close();
            }
        }
    }

    public void generateWaterLevels(
        List<Point2D>      points,
        XYSeriesCollection collection
    ) {
        if (points == null || points.isEmpty()) {
            return;
        }

        if (lastWaterLevel != null) {
            double [][] data = Lines.createWaterLines(points, lastWaterLevel);
            XYSeries series =
                new XYSeries(String.valueOf(lastWaterLevel), false);

            double [] x = data[0];
            double [] y = data[1];
            for (int i = 0; i < x.length; ++i) {
                series.add(x[i], y[i], false);
            }

            collection.addSeries(series);
        }
    }

    public void generateProfile(
        List<Point2D>      points,
        String             legend,
        XYSeriesCollection collection
    ) {
        if (points == null || points.isEmpty()) {
            return;
        }

        double [][] values = CrossSectionLine.fetchCrossSectionProfile(points);

        XYSeries series = new XYSeries(legend, false);

        double [] x = values[0];
        double [] y = values[1];
        for (int i = 0; i < x.length; ++i) {
            series.add(x[i], y[i], false);
        }

        collection.addSeries(series);
    }

    public XYSeriesCollection generateDataset() {
        XYSeriesCollection collection = new XYSeriesCollection();

        CrossSectionLineItem csli =
            (CrossSectionLineItem)crossSectionLinesCB.getSelectedItem();

        for (int i = 0; i < drawCrossSection.length; ++i) {
            List<Point2D> points = null;

            if (drawCrossSection[i]) {
                CrossSection cs = crossSections.get(i);
                for (Pair<CrossSection, CrossSectionLine> csl: csli.lines) {
                    if (csl.getA() == cs) {
                        points = csl.getB().fetchCrossSectionLinesPoints();
                        generateProfile(
                            points,
                            cs.getDescription(),
                            collection);
                        break;
                    }
                }
            }

            if (drawWaterLevel[i]) {
                CrossSection cs = crossSections.get(i);
                for (Pair<CrossSection, CrossSectionLine> csl: csli.lines) {
                    if (csl.getA() == cs) {
                        if (points != null) {
                            points = csl.getB().fetchCrossSectionLinesPoints();
                        }
                        generateWaterLevels(
                            points,
                            collection);
                        break;
                    }
                }
            }

        }

        return collection;
    }

    protected Object [] createCrossSectionLineItems(
        Map<Double, List<Pair<CrossSection, CrossSectionLine>>> km2lines
    ) {
        Object [] result = new Object[km2lines.size()];
        int i = 0;
        for (Map.Entry<Double, List<Pair<CrossSection, CrossSectionLine>>> entry:
            km2lines.entrySet()) {
            result[i++] = new CrossSectionLineItem(
                entry.getKey(),
                entry.getValue());
        }
        return result;
    }


    public static JFreeChart createChart(XYSeriesCollection collection) {
        JFreeChart chart = ChartFactory.createXYLineChart(
            null,
            "Abstand [m]",
            "H\u00f6he [m]",
            collection,
            PlotOrientation.VERTICAL,
            true,
            true,
            false);

        XYPlot plot = chart.getXYPlot();
        NumberAxis yAxis = (NumberAxis)plot.getRangeAxis();
        yAxis.setAutoRangeIncludesZero(false);

        ChartUtilities.applyCurrentTheme(chart);
        return chart;
    }

    public static void main(String [] args) {
        CrossSectionApp csa = new CrossSectionApp("Querprofile");
        csa.pack();
        RefineryUtilities.centerFrameOnScreen(csa);
        csa.setVisible(true);
    }
}
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