/*
 * Copyright 2004-2010 H2 Group. Multiple-Licensed under the H2 License,
 * Version 1.0, and under the Eclipse Public License, Version 1.0
 * (http://h2database.com/html/license.html).
 * Initial Developer: H2 Group
 */
package org.h2.value;

import java.sql.PreparedStatement;
import java.sql.SQLException;
import java.sql.Time;
import org.h2.constant.ErrorCode;
import org.h2.util.DateTimeUtils;

/**
 * Implementation of the TIME data type.
 */
public class ValueTime extends Value {

    /**
     * The precision in digits.
     */
    public static final int PRECISION = 6;

    /**
     * The display size of the textual representation of a time.
     * Example: 10:00:00
     */
    static final int DISPLAY_SIZE = 8;

    private final Time value;

    private ValueTime(Time value) {
        this.value = value;
    }

    /**
     * Parse a string to a java.sql.Time object.
     *
     * @param s the string to parse
     * @return the time
     */
    public static Time parseTime(String s) {
        return (Time) DateTimeUtils.parseDateTime(s, Value.TIME, ErrorCode.TIME_CONSTANT_2);
    }

    public Time getTime() {
        // this class is mutable - must copy the object
        return (Time) value.clone();
    }

    public Time getTimeNoCopy() {
        return value;
    }

    public String getSQL() {
        return "TIME '" + getString() + "'";
    }

    public int getType() {
        return Value.TIME;
    }

    protected int compareSecure(Value o, CompareMode mode) {
        ValueTime v = (ValueTime) o;
        return Integer.signum(value.compareTo(v.value));
    }

    public String getString() {
        return value.toString();
    }

    public long getPrecision() {
        return PRECISION;
    }

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

    public Object getObject() {
        return getTime();
    }

    public void set(PreparedStatement prep, int parameterIndex) throws SQLException {
        prep.setTime(parameterIndex, value);
    }

    /**
     * Get or create a time value for the given time.
     * Clone the time.
     *
     * @param time the time
     * @return the value
     */
    public static ValueTime get(Time time) {
        time = DateTimeUtils.cloneAndNormalizeTime(time);
        return getNoCopy(time);
    }

    /**
     * Get or create a time value for the given time.
     * Do not clone the time.
     *
     * @param time the time
     * @return the value
     */
    public static ValueTime getNoCopy(Time time) {
        return (ValueTime) Value.cache(new ValueTime(time));
    }

    public int getDisplaySize() {
        return DISPLAY_SIZE;
    }

    public boolean equals(Object other) {
        return other instanceof ValueTime && value.equals(((ValueTime) other).value);
    }

    public Value add(Value v) {
        Time t = new Time(value.getTime() + v.getTime().getTime());
        return ValueTime.get(t);
    }

    public Value subtract(Value v) {
        Time t = new Time(value.getTime() - v.getTime().getTime());
        return ValueTime.get(t);
    }

    public Value multiply(Value v) {
        long zeroTime = ValueTime.get(new Time(0)).getDate().getTime();
        long t = value.getTime() - zeroTime;
        t = (long) (t * v.getDouble()) + zeroTime;
        return ValueTime.get(new Time(t));
    }

    public Value divide(Value v) {
        long zeroTime = ValueTime.get(new Time(0)).getDate().getTime();
        long t = value.getTime() - zeroTime;
        t = (long) (t / v.getDouble()) + zeroTime;
        return ValueTime.get(new Time(t));
    }

}
