/**
 * Copyright (c) 2014, University of Warsaw
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without modification, are permitted
 * provided that the following conditions are met:
 *
 * 1. Redistributions of source code must retain the above copyright notice, this list of
 * conditions and the following disclaimer.
 *
 * 2. Redistributions in binary form must reproduce the above copyright notice, this list of
 * conditions and the following disclaimer in the documentation and/or other materials provided
 * with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
 * FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR
 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY
 * WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

package pl.edu.mimuw.cloudatlas.model;

import java.text.DateFormat;
import java.text.ParseException;
import java.text.SimpleDateFormat;

import pl.edu.mimuw.cloudatlas.model.Value;
import pl.edu.mimuw.cloudatlas.model.ValueTime;

/**
 * A class representing a POSIX time in milliseconds. This is a simple wrapper of a Java <code>Long</code> object.
 */
public class ValueTime extends ValueSimple<Long> {
    /**
     * A format string for constructing from or converting to a <code>String</code> object.
     */
    public static final DateFormat TIME_FORMAT = new SimpleDateFormat("yyyy/MM/dd HH:mm:ss.SSS");

    /**
     * Constructs a new <code>ValueTime</code> object wrapping the specified value.
     *
     * @param value the POSIX time
     */
    public ValueTime(Long value) {
        super(value);
    }

    /* Kryo needs a no-args constructor */
    private ValueTime() {
    }

    @Override
    public Type getType() {
        return TypePrimitive.TIME;
    }

    @Override
    public Value getDefaultValue() {
        return new ValueTime(0l);
    }

    /**
     * Constructs a new <code>ValueTime</code> object from its textual representation.
     *
     * @param time a time formatted according to {@link #TIME_FORMAT}
     * @throws ParseException if the <code>time</code> is incorrect
     * @see #TIME_FORMAT
     */
    public ValueTime(String time) throws ParseException {
        this(TIME_FORMAT.parse(time).getTime());
    }

    @Override
    public ValueBoolean isLowerThan(Value value) {
        sameTypesOrThrow(value, Operation.COMPARE);
        if(isNull() || value.isNull())
            return new ValueBoolean(null);
        return new ValueBoolean(getValue() < ((ValueTime)value).getValue());
    }

    @Override
    public ValueTime addValue(Value value) {
        if(!value.getType().isCompatible(TypePrimitive.DURATION))
            throw new IncompatibleTypesException(getType(), value.getType(), Operation.ADD);
        if(isNull() || value.isNull())
            return new ValueTime((Long)null);
        return new ValueTime(getValue() + ((ValueDuration)value).getValue());
    }

    @Override
    public Value subtract(Value value) {
        if(value.getType().isCompatible(TypePrimitive.DURATION)) {
            if(isNull() || value.isNull())
                return new ValueTime((Long)null);
            return new ValueTime(getValue() - ((ValueDuration)value).getValue());
        } else if(value.getType().isCompatible(TypePrimitive.TIME)) {
            if(isNull() || value.isNull())
                return new ValueTime((Long)null);
            return new ValueDuration(getValue() - ((ValueTime)value).getValue());
        }
        throw new IncompatibleTypesException(getType(), value.getType(), Operation.SUBTRACT);

    }

    @Override
    public Value convertTo(Type type) {
        switch(type.getPrimaryType()) {
            case STRING:
                return getValue() == null? ValueString.NULL_STRING : new ValueString(TIME_FORMAT.format(getValue()));
            case TIME:
                return this;
            default:
                throw new UnsupportedConversionException(getType(), type);
        }
    }
}