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//
// $Id: TimeUtil.java 6407 2011-01-01 05:02:21Z dhoover $
//
// Narya library - tools for developing networked games
// Copyright (C) 2002-2011 Three Rings Design, Inc., All Rights Reserved
// http://code.google.com/p/narya/
//
// This library is free software; you can redistribute it and/or modify it
// under the terms of the GNU Lesser General Public License as published
// by the Free Software Foundation; either version 2.1 of the License, or
// (at your option) any later version.
//
// This library 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
// Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public
// License along with this library; if not, write to the Free Software
// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA

package com.threerings.util;

import java.util.ArrayList;

import com.google.common.collect.Lists;

/**
 * Utility for times.
 */
public class TimeUtil
{
    /** Time unit constant. */
    public static final byte MILLISECOND = 0;

    /** Time unit constant. */
    public static final byte SECOND = 1;

    /** Time unit constant. */
    public static final byte MINUTE = 2;

    /** Time unit constant. */
    public static final byte HOUR = 3;

    /** Time unit constant. */
    public static final byte DAY = 4;

    // TODO: Weeks?, months?
    protected static final byte MAX_UNIT = DAY;

    /**
     * Returns (in seconds) the time elapsed between the supplied start and end timestamps (which
     * must be in milliseconds). Partial seconds are truncated, not rounded.
     */
    public static int elapsedSeconds (long startStamp, long endStamp)
    {
        if (endStamp < startStamp) {
            throw new IllegalArgumentException("End time must be after start time " +
                                               "[start=" + startStamp + ", end=" + endStamp + "]");
        }
        return (int)((endStamp - startStamp)/1000L);
    }

    /**
     * Get a translatable string specifying the magnitude of the specified duration. Results will
     * be between "1 second" and "X hours", with all times rounded to the nearest unit. "0 units"
     * will never be displayed, the minimum is 1.
     */
    public static String getTimeOrderString (long duration, byte minUnit)
    {
        return getTimeOrderString(duration, minUnit, MAX_UNIT);
    }

    /**
     * Get a translatable string specifying the magnitude of the specified duration, with the units
     * of time bounded between the minimum and maximum specified. "0 units" will never be returned,
     * the minimum is 1.
     */
    public static String getTimeOrderString (long duration, byte minUnit, byte maxUnit)
    {
        // enforce sanity
        minUnit = (byte) Math.min(minUnit, maxUnit);
        maxUnit = (byte) Math.min(maxUnit, MAX_UNIT);

        for (byte uu = MILLISECOND; uu <= MAX_UNIT; uu++) {
            int quantity = getQuantityPerUnit(uu);
            if ((minUnit <= uu) && (duration < quantity || maxUnit == uu)) {
                duration = Math.max(1, duration);
                return MessageBundle.tcompose(getTransKey(uu), String.valueOf(duration));
            }
            duration = Math.round(duration / quantity);
        }

        // will not happen, because eventually gg will be MAX_UNIT
        Thread.dumpStack();
        return null;
    }

    /**
     * Get a translatable string specifying the duration, down to the minimum granularity.
     */
    public static String getTimeString (long duration, byte minUnit)
    {
        return getTimeString(duration, minUnit, false);
    }

    /**
     * Get a translatable string specifying the duration, down to the minimum granularity.
     *
     * Normally rounds down to the nearest minUnit, but optionally rounds up.
     */
    public static String getTimeString (long duration, byte minUnit, boolean roundUp)
    {
        // sanity
        minUnit = (byte) Math.min(minUnit, MAX_UNIT);
        duration = Math.abs(duration);

        if (roundUp) {
            long quantity = 1;
            for (byte uu = MILLISECOND; uu < MAX_UNIT - 1; uu++) {
                quantity *= getQuantityPerUnit(uu);
            }

            if (duration % quantity > 0) {
                duration += quantity;
            }
        }

        ArrayList list = Lists.newArrayList();
        int parts = 0; // how many parts are in the translation string?
        for (byte uu = MILLISECOND; uu <= MAX_UNIT; uu++) {
            int quantity = getQuantityPerUnit(uu);
            if (minUnit <= uu) {
                long amt = duration % quantity;
                if (amt != 0) {
                    list.add(MessageBundle.tcompose(getTransKey(uu), String.valueOf(amt)));
                    parts++;
                }
            }
            duration /= quantity;
            if (duration <= 0 && parts > 0) {
                break;
            }
        }

        if (parts == 0) {
            // Wow, we didn't get ANYTHING? Okay, I guess that means it's zero of our minUnit
            return MessageBundle.tcompose(getTransKey(minUnit), 0);

        } else if (parts == 1) {
            return list.get(0);

        } else {
            return MessageBundle.compose("m.times_" + parts, list.toArray());
        }
    }

    /**
     * Internal method to get the quantity for the specified unit.  (Not very OO)
     */
    protected static int getQuantityPerUnit (byte unit)
    {
        switch (unit) {
        case MILLISECOND: return 1000;
        case SECOND: case MINUTE: return 60;
        case HOUR: return 24;
        case DAY: return Integer.MAX_VALUE;
        default: return -1;
        }
    }

    /**
     * Internal method to get the translation key for the specified unit.  (Not very OO)
     */
    protected static String getTransKey (byte unit)
    {
        switch (unit) {
        case MILLISECOND: return "m.millisecond";
        case SECOND: return "m.second";
        case MINUTE: return "m.minute";
        case HOUR: return "m.hour";
        case DAY: return "m.day";
        default: return null;
        }
    }
}