/**
 * Copyright (C) 2001-2017 by RapidMiner and the contributors
 * 
 * Complete list of developers available at our web site:
 * 
 * http://rapidminer.com
 * 
 * This program is free software: you can redistribute it and/or modify it under the terms of the
 * GNU Affero General Public License as published by the Free Software Foundation, either version 3
 * of the License, or (at your option) any later version.
 * 
 * This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without
 * even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
 * Affero General Public License for more details.
 * 
 * You should have received a copy of the GNU Affero General Public License along with this program.
 * If not, see http://www.gnu.org/licenses/.
*/
package com.rapidminer.gui.viewer;

import java.util.ArrayList;
import java.util.Collections;
import java.util.Date;
import java.util.Iterator;
import java.util.List;
import java.util.logging.Level;

import javax.swing.table.AbstractTableModel;

import com.rapidminer.example.Attribute;
import com.rapidminer.example.AttributeRole;
import com.rapidminer.example.Example;
import com.rapidminer.example.ExampleSet;
import com.rapidminer.example.set.ExampleSetUtilities;
import com.rapidminer.example.table.NumericalAttribute;
import com.rapidminer.tools.LogService;
import com.rapidminer.tools.Ontology;


/**
 * The model for the {@link com.rapidminer.gui.viewer.MetaDataViewerTable}.
 * 
 * @author Ingo Mierswa
 */
public class DataViewerTableModel extends AbstractTableModel {

	private static final long serialVersionUID = -3057324874942971672L;

	private Attribute[] regularAttributes;

	private Attribute[] specialAttributes;

	private ExampleSet exampleSet;

	public DataViewerTableModel(ExampleSet exampleSet) {
		this.exampleSet = exampleSet;

		this.regularAttributes = new Attribute[exampleSet.getAttributes().size()];
		Iterator<Attribute> r = exampleSet.getAttributes().iterator();
		int counter = 0;
		while (r.hasNext()) {
			this.regularAttributes[counter++] = r.next();
		}

		this.specialAttributes = new Attribute[exampleSet.getAttributes().specialSize()];
		List<AttributeRole> specialAttributesList = new ArrayList<>(exampleSet.getAttributes().specialSize());
		Iterator<AttributeRole> s = exampleSet.getAttributes().specialAttributes();
		while (s.hasNext()) {
			specialAttributesList.add(s.next());
		}
		Collections.sort(specialAttributesList, ExampleSetUtilities.SPECIAL_ATTRIBUTES_ROLE_COMPARATOR);
		for (int i = 0; i < specialAttributesList.size(); i++) {
			this.specialAttributes[i] = specialAttributesList.get(i).getAttribute();
		}

	}

	@Override
	public Class<?> getColumnClass(int column) {
		Class<?> type = super.getColumnClass(column);
		if (column == 0) {
			type = Integer.class;
		} else {
			Attribute attribute = getColumnAttribute(column);

			if (Ontology.ATTRIBUTE_VALUE_TYPE.isA(attribute.getValueType(), Ontology.DATE_TIME)) {
				type = Date.class;
			} else if (!attribute.isNominal()) {
				type = Double.class;
			} else {
				type = String.class;
			}
		}
		return type;
	}

	@Override
	public int getRowCount() {
		return exampleSet.size();
	}

	/**
	 * Returns the sum of the number of special attributes, the number of regular attributes and 1
	 * for the row no. column.
	 */
	@Override
	public int getColumnCount() {
		return this.specialAttributes.length + this.regularAttributes.length + 1;
	}

	@Override
	public Object getValueAt(int row, int column) {
		if (column == 0) {
			return row + 1;
		} else {
			int col = column - 1;
			Example example = exampleSet.getExample(row);
			if (example != null) {
				if (col < specialAttributes.length) {
					return getValueWithCorrectClass(example, specialAttributes[col]);
				} else {
					return getValueWithCorrectClass(example, this.regularAttributes[col - specialAttributes.length]);
				}
			} else {
				return null;
			}
		}
	}

	@Override
	public String getColumnName(int column) {
		if (column < 0) {
			return "";
		}
		if (column == 0) {
			return "Row No.";
		} else {
			int col = column - 1;
			if (col < specialAttributes.length) {
				return specialAttributes[col].getName();
			} else {
				return this.regularAttributes[col - specialAttributes.length].getName();
			}
		}
	}

	/**
	 * Returns the {@link Attribute} for the given column or <code>null</code> if this is no column
	 * denoting an {@link Attribute} in the {@link ExampleSet}.
	 * 
	 * @param column
	 * @return
	 */
	public Attribute getColumnAttribute(int column) {
		if (column == 0) {
			return null;
		}
		int col = column - 1;
		Attribute attribute = null;
		if (col < specialAttributes.length) {
			attribute = specialAttributes[col];
		} else {
			attribute = regularAttributes[col - specialAttributes.length];
		}

		return attribute;
	}

	private Object getValueWithCorrectClass(Example example, Attribute attribute) {
		try {
			double value = example.getValue(attribute);
			if (Double.isNaN(value)) {
				return "?";
			}
			if (Ontology.ATTRIBUTE_VALUE_TYPE.isA(attribute.getValueType(), Ontology.DATE_TIME)) {
				// simply return date, format is evaluated directly in jtable, see todo above
				return new Date((long) value);
			} else if (attribute.isNumerical()) {
				return Double.valueOf(example.getValue(attribute));
			} else {
				return example.getValueAsString(attribute, NumericalAttribute.DEFAULT_NUMBER_OF_DIGITS, false);
			}
		} catch (Throwable e) {
			LogService.getRoot().log(Level.WARNING,
					"com.rapidminer.gui.viewer.DataViewerTableModel.showing_correct_value_error", e.getMessage());
			return "Error";
		}
	}

}