/*
    * This file is a part of CAST project.
    * (c) Copyright 2007, AGH University of Science & Technology
    * https://caribou.iisg.agh.edu.pl/trac/cast
    *
    * Licensed under the Eclipse Public License, Version 1.0 (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.eclipse.org/legal/epl-v10.html
   */
  /*
   * File: ButtonTableCreator.java
   * Created: 2009-04-30
   * Author: bmilos
   * $Id$
   */
  
  package pl.edu.agh.cast.importer.wizard.utils;
  
  import java.text.SimpleDateFormat;
  import java.util.Collections;
  import java.util.Date;
  import java.util.LinkedList;
  import java.util.List;
  import java.util.Map;
  import java.util.Map.Entry;
  
  import org.eclipse.swt.SWT;
  import org.eclipse.swt.custom.TableEditor;
  import org.eclipse.swt.events.SelectionAdapter;
  import org.eclipse.swt.events.SelectionEvent;
  import org.eclipse.swt.graphics.Color;
  import org.eclipse.swt.layout.GridData;
  import org.eclipse.swt.widgets.Button;
  import org.eclipse.swt.widgets.Composite;
  import org.eclipse.swt.widgets.Table;
  import org.eclipse.swt.widgets.TableColumn;
  import org.eclipse.swt.widgets.TableItem;
  
  import pl.edu.agh.cast.importer.base.data.DataRow;
  import pl.edu.agh.cast.importer.base.data.TabularData;
  import pl.edu.agh.cast.importer.wizard.util.Messages;
  
  /**
   * SWT table creator, which creates tables with "select" buttons as labels.
   * 
   * @author AGH CAST Team
   */
  public class ButtonTableCreator {
  
  	private static final int MAX_ROWS_TO_DISPLAY = 50;
  
  	private static final Color GRAY = new Color(null, 200, 200, 200);
  
  	private static final Color WHITE = new Color(null, 255, 255, 255);
  
  	private static final Color BLUE = new Color(null, 188, 210, 238);
  
  	private Table table;
  
  	private Button[] selectButtons;
  
  	private List<Integer> selectedColumnIndices;
  
  	private int maxSelectedColumnsCount;
  
  	/**
  	 * The mapping of dialog tabular data column indices (always increased by 1 because of the row number column) to the
  	 * indices of columns of the "entire" tabular data (containing only the columns selected at the
  	 * <code>AnalyzersSelectionPage</code>).
  	 */
  	private Map<Integer, Integer> dialogToDataIndices;
  
  	/**
  	 * The default constructor.
  	 * 
  	 * @param selectColumnsCount
  	 *            the maximal number of columns allowed to be selected
  	 */
  	public ButtonTableCreator(int selectColumnsCount) {
  		selectedColumnIndices = new LinkedList<Integer>();
  		this.maxSelectedColumnsCount = selectColumnsCount;
  	}
  
  	/**
  	 * Creates table basing on parsed tabular data.
  	 * 
  	 * @param container
  	 *            the table container
  	 * @param tableLData
  	 *            the table layout data
  	 * @param tabData
  	 *            the data to be inserted into the table
  	 * @param indicesMap
  	 *            the mapping of dialog tabular data column indices to the column indices of the entire tabular data
  	 */
  	public void createTable(Composite container, GridData tableLData, TabularData tabData,
  	        Map<Integer, Integer> indicesMap) {
  		this.dialogToDataIndices = indicesMap;
 
 		if (table != null) {
 			table.dispose();
 		}
 		table = new Table(container, SWT.BORDER | SWT.H_SCROLL | SWT.V_SCROLL);
 		table.setHeaderVisible(false);
 		table.setLinesVisible(true);
 
 		if (tableLData != null) {
 			table.setLayoutData(tableLData);
 		}
 
 		if (tabData == null) {
 			return;
 		}
 
 		prepareTableColumns(tabData);
 
 		TableItem tableItem = new TableItem(table, SWT.NONE);
 		makeFirstTableRowAsSelectButtons(tabData, tableItem);
 
 		int size = Math.min(MAX_ROWS_TO_DISPLAY, tabData.size());
 		fillTableRows(tabData, tableItem, size);
 	}
 
 	/*
 	 * -----------------------------------------------------------------------------------------------------------
 	 * --------------------------HELPER METHODS------------------------------------------------------------
 	 * -----------------------------------------------------------------------------------------------------------
 	 */
 
 	/**
 	 * Prepares the table columns.
 	 */
 	private void prepareTableColumns(TabularData data) {
 		// add row number column
 		TableColumn tableColumn = new TableColumn(table, SWT.NONE);
 		tableColumn.setWidth(100);
 		tableColumn.setAlignment(SWT.RIGHT);
 
 		for (int columnIndex = 1; columnIndex <= data.getColumnsCount(); columnIndex++) {
 			tableColumn = new TableColumn(table, SWT.NONE);
 			tableColumn.pack();
 			tableColumn.setWidth(100);
 		}
 	}
 
 	/**
 	 * Makes columns headers as buttons.
 	 */
 	private void makeFirstTableRowAsSelectButtons(TabularData data, TableItem tableItem) {
 		tableItem.setText(0, Messages.TableViewerHelper_Row);
 		tableItem.setBackground(0, GRAY);
 		table.getColumn(0).pack();
 
 		selectButtons = new Button[data.getColumnsCount()];
 
 		for (int columnIndex = 1; columnIndex <= data.getColumnsCount(); columnIndex++) {
 			TableEditor editor = new TableEditor(table);
 			Button selectBtn = new Button(table, SWT.PUSH);
 			selectButtons[columnIndex - 1] = selectBtn;
 			selectBtn.pack();
 
 			final int columnIndexCp = columnIndex; // final variable for anonymous access
 			selectBtn.addSelectionListener(new SelectionAdapter() {
 				@Override
 				public void widgetSelected(SelectionEvent event) {
 					handleSelectButtonPressed(columnIndexCp);
 				}
 			});
 			editor.grabHorizontal = true;
 
 			selectBtn.setText(Messages.ButtonTableCreator_Select);
 			editor.minimumWidth = selectBtn.getSize().x;
 			editor.minimumHeight = selectBtn.getSize().y;
 			editor.horizontalAlignment = SWT.FILL;
 			editor.verticalAlignment = SWT.FILL;
 			editor.grabVertical = true;
 			editor.grabHorizontal = true;
 			editor.setEditor(selectBtn, tableItem, columnIndex);
 		}
 	}
 
 	/**
 	 * Fills table rows to the pointed size.
 	 */
 	private void fillTableRows(TabularData data, TableItem tableItem, int size) {
 		for (int rowIndex = 0; rowIndex < size; rowIndex++) {
 			final TableItem tabItem = new TableItem(table, SWT.NONE);
 
 			tabItem.setText(0, String.valueOf(rowIndex + 1));
 			tabItem.setBackground(0, GRAY);
 
 			for (int columnIndex = 1; columnIndex <= data.getColumnsCount(); columnIndex++) {
 				Object valueToSet = null;
 				DataRow row = data.getRowByIndex(rowIndex);
 				String format = data.getFormatters().get(columnIndex - 1);
 				if (columnIndex <= row.size()) {
 					valueToSet = row.get(columnIndex - 1);
 				}
 				if (valueToSet == null) {
 					valueToSet = ""; //$NON-NLS-1$
 				}
 				if (format != null && valueToSet instanceof Date) {
 					SimpleDateFormat sdf = new SimpleDateFormat(format);
 					tabItem.setText(columnIndex, sdf.format((Date)valueToSet));
 				} else {
 					tabItem.setText(columnIndex, valueToSet.toString());
 				}
 			}
 		}
 	}
 
 	/*----------------------------------------------------------------------------------------------------------*/
 
 	/*
 	 * -----------------------------------------------------------------------------------------------------------
 	 * --------------------------ACTION METHODS------------------------------------------------------------
 	 * -----------------------------------------------------------------------------------------------------------
 	 */
 
 	private void handleSelectButtonPressed(int columnIndex) {
 		if (selectedColumnIndices.contains(columnIndex)) {
 			for (int rowIndex = 1; rowIndex < table.getItemCount(); rowIndex++) {
 				TableItem tableItem = table.getItem(rowIndex);
 				tableItem.setBackground(columnIndex, WHITE);
 			}
 			selectedColumnIndices.remove(new Integer(columnIndex));
 			selectButtons[columnIndex - 1].setText(Messages.ButtonTableCreator_Select);
 			return;
 		}
 
 		Integer colIdxToDeselect = null;
 		if (selectedColumnIndices != null && !selectedColumnIndices.isEmpty()
 		        && selectedColumnIndices.size() >= maxSelectedColumnsCount) {
 			colIdxToDeselect = selectedColumnIndices.get(0);
 		}
 
 		for (int rowIndex = 1; rowIndex < table.getItemCount(); rowIndex++) {
 			TableItem tableItem = table.getItem(rowIndex);
 			tableItem.setBackground(columnIndex, BLUE);
 
 			// deselect first selected column if no more column selection is allowed
 			if (colIdxToDeselect != null) {
 				tableItem.setBackground(colIdxToDeselect, WHITE);
 			}
 		}
 
 		selectedColumnIndices.add(columnIndex);
 		selectButtons[columnIndex - 1].setText(Messages.ButtonTableCreator_Deselect);
 
 		if (colIdxToDeselect != null) {
 			selectedColumnIndices.remove(new Integer(colIdxToDeselect));
 			selectButtons[colIdxToDeselect - 1].setText(Messages.ButtonTableCreator_Select);
 		}
 	}
 
 	/**
 	 * Method called by the mediating conversion rules configuration dialog in order to set the previously chosen table
 	 * columns selection.
 	 * 
 	 * @param columnIndices
 	 *            the indices of the columns that are to be selected
 	 */
 	public void selectTableColumns(List<Integer> columnIndices) {
 		// int dialogColIdx = columnIndices;
 		List<Integer> dialogColIndices = new LinkedList<Integer>();
 
 		if (columnIndices != null && !columnIndices.isEmpty()) {
 			for (Integer colIdx : columnIndices) {
 				for (Entry<Integer, Integer> entry : dialogToDataIndices.entrySet()) {
 					if (entry.getValue() != null && entry.getValue().equals(colIdx - 1)) {
 						dialogColIndices.add(entry.getKey());
 					}
 				}
 			}
 		}
 
 		for (int rowIndex = 1; rowIndex < table.getItemCount(); rowIndex++) {
 			for (Integer dialogColIdx : dialogColIndices) {
 				TableItem tableItem = table.getItem(rowIndex);
 				tableItem.setBackground(dialogColIdx, BLUE);
 			}
 		}
 
 		for (Integer dialogColIdx : dialogColIndices) {
 			selectButtons[dialogColIdx - 1].setText(Messages.ButtonTableCreator_Deselect);
 			if (!selectedColumnIndices.contains(dialogColIdx)) {
 				selectedColumnIndices.add(dialogColIdx);
 			}
 		}
 	}
 
 	/**
 	 * Selects a specified column index in table.
 	 * 
 	 * @param columnIndex
 	 *            the column index to select
 	 */
 	public void selectTableColumn(int columnIndex) {
 		List<Integer> colIndices = new LinkedList<Integer>();
 		colIndices.add(columnIndex);
 		selectTableColumns(colIndices);
 	}
 
 	/*----------------------------------------------------------------------------------------------------------*/
 
 	/*
 	 * -----------------------------------------------------------------------------------------------------------
 	 * --------------------------GETTERS AND SETTERS------------------------------------------------------
 	 * -----------------------------------------------------------------------------------------------------------
 	 */
 
 	/**
 	 * Retrieves the selected column index of the entire tabular data (basing on the indices mapping).
 	 * 
 	 * @return selected column index
 	 */
 	public List<Integer> getSelectedColumnIndices() {
 		if (dialogToDataIndices == null || selectedColumnIndices == null || selectedColumnIndices.isEmpty()) {
 			// The column index is decreased by 1 for the row column should not be counted
 			return selectedColumnIndices;
 		}
 
 		// The dialogToDataIndices mapping already considers the row number column
 		List<Integer> result = new LinkedList<Integer>();
 		for (Integer colIdx : selectedColumnIndices) {
 			result.add(dialogToDataIndices.get(colIdx));
 		}
 		Collections.sort(result);
 		return result;
 	}
 
 	/*----------------------------------------------------------------------------------------------------------*/
 }