/*
 * Copyright (c) 2006-2011 Nuxeo SA (http://nuxeo.com/) and others.
 *
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 *
 * Contributors:
 *     Florent Guillaume
 */

package org.eclipse.ecr.core.query.sql.model;

import java.util.Calendar;
import java.util.Locale;

import org.joda.time.DateTime;
import org.joda.time.format.DateTimeFormatter;
import org.joda.time.format.ISODateTimeFormat;

/**
 * @author Florent Guillaume
 */
public class DateLiteral extends Literal {

    private static final long serialVersionUID = 279219479611055690L;

    public static final DateTimeFormatter dateParser = ISODateTimeFormat.dateParser().withLocale(
            Locale.getDefault());

    public static final DateTimeFormatter dateTimeParser = ISODateTimeFormat.dateOptionalTimeParser().withOffsetParsed();

    public static final DateTimeFormatter dateFormatter = ISODateTimeFormat.date();

    public static final DateTimeFormatter dateTimeFormatter = ISODateTimeFormat.dateTime();

    // Direct access from org.eclipse.ecr.core.search.backend.compass.QueryConverter
    public final DateTime value;

    public final boolean onlyDate;

    public DateLiteral(String value, boolean onlyDate) {
        this.onlyDate = onlyDate;
        if (onlyDate) {
            this.value = dateParser.parseDateTime(value);
        } else {
            // workaround to allow space instead of T after the date part
            if (value.charAt(10) == ' ') {
                char[] s = value.toCharArray();
                s[10] = 'T';
                value = new String(s);
            }
            this.value = dateTimeParser.parseDateTime(value);
        }
    }

    public Calendar toCalendar() {
        return value.toGregorianCalendar();
    }

    @Override
    public String toString() {
        if (onlyDate) {
            String s = dateFormatter.print(value);
            return new StringBuffer(s.length() + 7).append("DATE '").append(s).append(
                    "'").toString();
        } else {
            String s = dateTimeFormatter.print(value);
            return new StringBuffer(s.length() + 12).append("TIMESTAMP '").append(
                    s).append("'").toString();
        }
    }

    @Override
    public String asString() {
        if (onlyDate) {
            return dateFormatter.print(value);
        } else {
            return dateTimeFormatter.print(value);
        }
    }

    @Override
    public void accept(IVisitor visitor) {
        visitor.visitDateLiteral(this);
    }

    @Override
    public boolean equals(Object obj) {
        if (obj == this) {
            return true;
        }
        if (obj instanceof DateLiteral) {
            return value.equals(((DateLiteral) obj).value);
        }
        return false;
    }

    @Override
    public int hashCode() {
        return value.hashCode();
    }

    public static String dateTime(DateLiteral date) {
        return dateTimeFormatter.print(date.value);
    }

    public static String date(DateLiteral date) {
        return dateFormatter.print(date.value);
    }
}