app/src/main/java/me/zhanghai/android/douya/util/TimeUtils.java

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/*
 * Copyright (c) 2015 Zhang Hai <Dreaming.in.Code.ZH@Gmail.com>
 * All Rights Reserved.
 */

package me.zhanghai.android.douya.util;

import android.content.Context;

import org.threeten.bp.Duration;
import org.threeten.bp.LocalDate;
import org.threeten.bp.LocalDateTime;
import org.threeten.bp.ZoneId;
import org.threeten.bp.ZonedDateTime;
import org.threeten.bp.chrono.IsoChronology;
import org.threeten.bp.format.DateTimeFormatter;
import org.threeten.bp.format.DateTimeFormatterBuilder;
import org.threeten.bp.format.DateTimeParseException;

import me.zhanghai.android.douya.R;

public class TimeUtils {

    private static final int SECONDS_PER_MINUTE = 60;
    private static final int MINUTES_PER_HOUR = 60;
    private static final int SECONDS_PER_HOUR = SECONDS_PER_MINUTE * MINUTES_PER_HOUR;

    private static final DateTimeFormatter DOUBAN_DATE_TIME_FORMATTER =
            new DateTimeFormatterBuilder()
                    .append(DateTimeFormatter.ISO_LOCAL_DATE)
                    .appendLiteral(' ')
                    .append(DateTimeFormatter.ISO_LOCAL_TIME)
                    .toFormatter()
                    .withChronology(IsoChronology.INSTANCE);

    private static final ZoneId DOUBAN_ZONED_ID = ZoneId.of("Asia/Shanghai");

    private static final Duration JUST_NOW_DURATION = Duration.ofMinutes(1);
    private static final Duration MINUTE_PATTERN_DURATION = Duration.ofHours(1);
    private static final Duration HOUR_PATTERN_DURATION = Duration.ofHours(2);

    /**
     * @throws DateTimeParseException
     */
    public static ZonedDateTime parseDoubanDateTime(String doubanDateTime) {
        return ZonedDateTime.of(LocalDateTime.parse(doubanDateTime, DOUBAN_DATE_TIME_FORMATTER),
                DOUBAN_ZONED_ID);
    }

    public static String formatDateTime(ZonedDateTime dateTime, Context context) {
        ZonedDateTime now = ZonedDateTime.now().withZoneSameInstant(dateTime.getZone());
        LocalDate date = dateTime.toLocalDate();
        LocalDate nowDate = now.toLocalDate();
        if (date.equals(nowDate)) {
            Duration duration = Duration.between(dateTime, now);
            if (duration.compareTo(Duration.ZERO) > 0) {
                if (duration.compareTo(JUST_NOW_DURATION) < 0) {
                    return context.getString(R.string.just_now);
                } else if (duration.compareTo(MINUTE_PATTERN_DURATION) < 0) {
                    return context.getString(R.string.minute_format,
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