package cz.frantovo.gui.tabulky;

import java.awt.Component;

import java.awt.event.MouseAdapter;

import java.awt.event.MouseEvent;

import java.awt.event.MouseListener;

import java.util.ArrayList;

import java.util.Arrays;

import java.util.Comparator;

import java.util.HashMap;

import java.util.Iterator;

import java.util.List;

import java.util.Map;

import javax.swing.Icon;

import javax.swing.ImageIcon;

import javax.swing.JLabel;

import javax.swing.JTable;

import javax.swing.event.TableModelEvent;

import javax.swing.event.TableModelListener;

import javax.swing.table.AbstractTableModel;

import javax.swing.table.JTableHeader;

import javax.swing.table.TableCellRenderer;

import javax.swing.table.TableColumnModel;

import javax.swing.table.TableModel;

/**

 * <p>Tato třída přidává tabulce funkčnost řazení podle více sloupců. Skutečný

 * model obsahující data stačí obalit touto třídou + je potřeba nastavit:

 * tableSorterModel.setTableHeader(table.getTableHeader());</p>

 * 

 * <p>Jednodušší ale je používat třídu cz.frantovo.gui.tabulky.JFTable, která všechno

 * udělá za vás. </p>

 * 

 * <p>Tento TableSorterModel je založen na původním TableSorter od autorů: Philip

 * Milne, Brendon McLean, Dan van Enckevort a Parwinder Sekhon.</p>

 *

 * <p>Já jsem přidal hezčí grafické šipky v záhlaví tabulky</p>

 * 

 * @author František Kučera

 */

public class TableSorterModel extends AbstractTableModel {

    private static final long serialVersionUID = 7902301859145867387L;

    protected TableModel tableModel;

    public static final int DESCENDING = -1;

    public static final int NOT_SORTED = 0;

    public static final int ASCENDING = 1;

    private static Directive EMPTY_DIRECTIVE = new Directive(-1,

            NOT_SORTED);

    public static final Comparator COMPARABLE_COMAPRATOR = new Comparator() {

        public int compare(Object o1,

                Object o2) {

            return ((Comparable) o1).compareTo(o2);

        }

    };

    public static final Comparator LEXICAL_COMPARATOR = new Comparator() {

        public int compare(Object o1,

                Object o2) {

            return o1.toString().compareTo(o2.toString());

        }

    };

    private Row[] viewToModel;

    private int[] modelToView;

    private JTableHeader tableHeader;

    private MouseListener mouseListener;

    private TableModelListener tableModelListener;

    private Map columnComparators = new HashMap();

    private List sortingColumns = new ArrayList();

    private ImageIcon headerIconDown = new ImageIcon(getClass().getResource("/cz/frantovo/gui/tabulky/dolu.png"));

    private ImageIcon headerIconUp = new ImageIcon(getClass().getResource("/cz/frantovo/gui/tabulky/nahoru.png"));

    public TableSorterModel() {

        this.mouseListener = new MouseHandler();

        this.tableModelListener = new TableModelHandler();

    }

    public TableSorterModel(TableModel tableModel) {

        this();

        setTableModel(tableModel);

    }

    public TableSorterModel(TableModel tableModel,

            JTableHeader tableHeader) {

        this();

        setTableHeader(tableHeader);

        setTableModel(tableModel);

    }

    private void clearSortingState() {

        viewToModel = null;

        modelToView = null;

    }

    public TableModel getTableModel() {

        return tableModel;

    }

    public void setTableModel(TableModel tableModel) {

        if (this.tableModel != null) {

            this.tableModel.removeTableModelListener(tableModelListener);

        }

        this.tableModel = tableModel;

        if (this.tableModel != null) {

            this.tableModel.addTableModelListener(tableModelListener);

        }

        clearSortingState();

        fireTableStructureChanged();

    }

    public JTableHeader getTableHeader() {

        return tableHeader;

    }

    public void setTableHeader(JTableHeader tableHeader) {

        if (this.tableHeader != null) {

            this.tableHeader.removeMouseListener(mouseListener);

            TableCellRenderer defaultRenderer = this.tableHeader.getDefaultRenderer();

            if (defaultRenderer instanceof SortableHeaderRenderer) {

                this.tableHeader.setDefaultRenderer(((SortableHeaderRenderer) defaultRenderer).tableCellRenderer);

            }

        }

        this.tableHeader = tableHeader;

        if (this.tableHeader != null) {

            this.tableHeader.addMouseListener(mouseListener);

            this.tableHeader.setDefaultRenderer(new SortableHeaderRenderer(this.tableHeader.getDefaultRenderer()));

        }

    }

    public boolean isSorting() {

        return sortingColumns.size() != 0;

    }

    private Directive getDirective(int column) {

        for (int i = 0; i < sortingColumns.size(); i++) {

            Directive directive = (Directive) sortingColumns.get(i);

            if (directive.column == column) {

                return directive;

            }

        }

        return EMPTY_DIRECTIVE;

    }

    public int getSortingStatus(int column) {

        return getDirective(column).direction;

    }

    private void sortingStatusChanged() {

        clearSortingState();

        fireTableDataChanged();

        if (tableHeader != null) {

            tableHeader.repaint();

        }

    }

    public void setSortingStatus(int column,

            int status) {

        Directive directive = getDirective(column);

        if (directive != EMPTY_DIRECTIVE) {

            sortingColumns.remove(directive);

        }

        if (status != NOT_SORTED) {

            sortingColumns.add(new Directive(column,

                    status));

        }

        sortingStatusChanged();

    }

    protected Icon getHeaderRendererIcon(int column,

            int size) {

        Directive directive = getDirective(column);

        if (directive == EMPTY_DIRECTIVE) {

            return null;

        }

        if (directive.direction == DESCENDING) {

            return headerIconDown;

        } else {

            return headerIconUp;

        }

    }

    private void cancelSorting() {

        sortingColumns.clear();

        sortingStatusChanged();

    }

    public void setColumnComparator(Class type,

            Comparator comparator) {

        if (comparator == null) {

            columnComparators.remove(type);

        } else {

            columnComparators.put(type,

                    comparator);

        }

    }

    protected Comparator getComparator(int column) {

        Class columnType = tableModel.getColumnClass(column);

        Comparator comparator = (Comparator) columnComparators.get(columnType);

        if (comparator != null) {

            return comparator;

        }

        if (Comparable.class.isAssignableFrom(columnType)) {

            return COMPARABLE_COMAPRATOR;

        }

        return LEXICAL_COMPARATOR;

    }

    private Row[] getViewToModel() {

        if (viewToModel == null) {

            int tableModelRowCount = tableModel.getRowCount();

            viewToModel = new Row[tableModelRowCount];

            for (int row = 0; row < tableModelRowCount; row++) {

                viewToModel[row] = new Row(row);

            }

            if (isSorting()) {

                Arrays.sort(viewToModel);

            }

        }

        return viewToModel;

    }

    public int modelIndex(int viewIndex) {

        if (viewIndex > -1 && viewIndex < getViewToModel().length) {

            return getViewToModel()[viewIndex].modelIndex;

        } else {

            return -1;

        }

    }

    private int[] getModelToView() {

        if (modelToView == null) {

            int n = getViewToModel().length;

            modelToView = new int[n];

            for (int i = 0; i < n; i++) {

                modelToView[modelIndex(i)] = i;

            }

        }

        return modelToView;

    }

    // Metody rozhran� TableModel

    public int getRowCount() {

        return (tableModel == null) ? 0 : tableModel.getRowCount();

    }

    public int getColumnCount() {

        return (tableModel == null) ? 0 : tableModel.getColumnCount();

    }

    public String getColumnName(int column) {

        return tableModel.getColumnName(column);

    }

    public Class getColumnClass(int column) {

        return tableModel.getColumnClass(column);

    }

    public boolean isCellEditable(int row,

            int column) {

        return tableModel.isCellEditable(modelIndex(row),

                column);

    }

    public Object getValueAt(int row,

            int column) {

        return tableModel.getValueAt(modelIndex(row),

                column);

    }

    public void setValueAt(Object aValue,

            int row,

            int column) {

        tableModel.setValueAt(aValue,

                modelIndex(row),

                column);

    }

    // Pomocn� t��dy

    private class Row implements Comparable {

        private int modelIndex;

        public Row(int index) {

            this.modelIndex = index;

        }

        public int compareTo(Object o) {

            int row1 = modelIndex;

            int row2 = ((Row) o).modelIndex;

            for (Iterator it = sortingColumns.iterator(); it.hasNext();) {

                Directive directive = (Directive) it.next();

                int column = directive.column;

                Object o1 = tableModel.getValueAt(row1,

                        column);

                Object o2 = tableModel.getValueAt(row2,

                        column);

                int comparison = 0;

                // Define null less than everything, except

                // null.

                if (o1 == null && o2 == null) {

                    comparison = 0;

                } else if (o1 == null) {

                    comparison = -1;

                } else if (o2 == null) {

                    comparison = 1;

                } else {

                    comparison = getComparator(column).compare(o1,

                            o2);

                }

                if (comparison != 0) {

                    return directive.direction == DESCENDING ? -comparison : comparison;

                }

            }

            return 0;

        }

    }

    private class TableModelHandler implements TableModelListener {

        public void tableChanged(TableModelEvent e) {

            // If we're not sorting by anything, just pass the event

            // along.

            if (!isSorting()) {

                clearSortingState();

                fireTableChanged(e);

                return;

            }

            // If the table structure has changed, cancel the

            // sorting; the

            // sorting columns may have been either moved or deleted

            // from

            // the model.

            if (e.getFirstRow() == TableModelEvent.HEADER_ROW) {

                cancelSorting();

                fireTableChanged(e);

                return;

            }

            // We can map a cell event through to the view without

            // widening

            // when the following conditions apply:

            //

            // a) all the changes are on one row (e.getFirstRow() ==

            // e.getLastRow()) and,

            // b) all the changes are in one column (column !=

            // TableModelEvent.ALL_COLUMNS) and,

            // c) we are not sorting on that column

            // (getSortingStatus(column) == NOT_SORTED) and,

            // d) a reverse lookup will not trigger a sort

            // (modelToView != null)

            //

            // Note: INSERT and DELETE events fail this test as they

            // have column == ALL_COLUMNS.

            //

            // The last check, for (modelToView != null) is to see

            // if modelToView

            // is already allocated. If we don't do this check;

            // sorting can become

            // a performance bottleneck for applications where cells

            // change rapidly in different parts of the table. If

            // cells

            // change alternately in the sorting column and then

            // outside of

            // it this class can end up re-sorting on alternate cell

            // updates -

            // which can be a performance problem for large tables.

            // The last

            // clause avoids this problem.

            int column = e.getColumn();

            if (e.getFirstRow() == e.getLastRow() && column != TableModelEvent.ALL_COLUMNS && getSortingStatus(column) == NOT_SORTED && modelToView != null) {

                int viewIndex = getModelToView()[e.getFirstRow()];

                fireTableChanged(new TableModelEvent(TableSorterModel.this,

                        viewIndex,

                        viewIndex,

                        column,

                        e.getType()));

                return;

            }

            // Something has happened to the data that may have

            // invalidated the row order.

            clearSortingState();

            fireTableDataChanged();

            return;

        }

    }

    private class MouseHandler extends MouseAdapter {

        public void mouseClicked(MouseEvent e) {

            JTableHeader h = (JTableHeader) e.getSource();

            TableColumnModel columnModel = h.getColumnModel();

            int viewColumn = columnModel.getColumnIndexAtX(e.getX());

            int column = columnModel.getColumn(viewColumn).getModelIndex();

            if (column != -1) {

                int status = getSortingStatus(column);

                if (!e.isControlDown()) {

                    cancelSorting();

                }

                // Cycle the sorting states through {NOT_SORTED,

                // ASCENDING, DESCENDING} or

                // {NOT_SORTED, DESCENDING, ASCENDING} depending

                // on whether shift is pressed.

                status = status + (e.isShiftDown() ? -1 : 1);

                status = (status + 4) % 3 - 1; // signed mod,

                // returning

                // {-1, 0, 1}

                setSortingStatus(column,

                        status);

            }

        }

    }

    private class SortableHeaderRenderer implements TableCellRenderer {

        private TableCellRenderer tableCellRenderer;

        public SortableHeaderRenderer(TableCellRenderer tableCellRenderer) {

            this.tableCellRenderer = tableCellRenderer;

        }

        public Component getTableCellRendererComponent(JTable table,

                Object value,

                boolean isSelected,

                boolean hasFocus,

                int row,

                int column) {

            Component c = tableCellRenderer.getTableCellRendererComponent(table,

                    value,

                    isSelected,

                    hasFocus,

                    row,

                    column);

            if (c instanceof JLabel) {

                JLabel l = (JLabel) c;

                l.setHorizontalTextPosition(JLabel.LEFT);

                int modelColumn = table.convertColumnIndexToModel(column);

                l.setIcon(getHeaderRendererIcon(modelColumn,

                        l.getFont().getSize()));

            }

            return c;

        }

    }

    private static class Directive {

        private int column;

        private int direction;

        public Directive(int column,

                int direction) {

            this.column = column;

            this.direction = direction;

        }

    }

    public void fireTableColumnUpdated(int index) {

        for (int i = 0; i < getRowCount(); i++) {

            fireTableCellUpdated(i,

                    index);

        }

    }

}