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package cn.woodwhales.common.util;

import org.apache.commons.lang3.StringUtils;

import java.time.LocalDateTime;
import java.time.ZoneId;
import java.time.ZoneOffset;
import java.time.ZonedDateTime;
import java.time.format.DateTimeFormatter;
import java.util.Locale;
import java.util.Objects;

/**
 * 时间工具
 * @author woodwhales on 2021-11-30 14:34
 */
public class TimeTool {

    /**
     * JDK中日期时间格式：EEE MMM dd HH:mm:ss zzz yyyy
     */
    private final static String date_pattern = "EEE MMM dd HH:mm:ss zzz yyyy";

    /**
     * 默认输出时间格式
     */
    private final static String default_pattern = "yyyy-MM-dd HH:mm:ss";


    /**
     * 标准日期时间格式，精确到毫秒：yyyy-MM-dd HH:mm:ss.SSS
     */
    private static final String normal_datetime_ms_pattern = "yyyy-MM-dd HH:mm:ss.SSS";

    /**
     * local_date_time 的默认时间格式
     */
    private final static String local_date_time_pattern = "uuuu-MM-dd'T'HH:mm:ss.SSS";

    /**
     * 
     * 格式化时间字符串：
     * EEE MMM dd HH:mm:ss zzz yyyy 时间转 yyyy-MM-dd HH:mm:ss
     * uuuu-MM-dd'T'HH:mm:ss.SSS 时间转 yyyy-MM-dd HH:mm:ss
     * 
     * @param dateStr 需要格式化的时间字符串
     * @return yyyy-MM-dd HH:mm:ss
     */
    public static String convertDateStr(String dateStr) {
        if(StringUtils.isBlank(dateStr)) {
            return "";
        }

        DateTimeFormatter dateTimeFormatter = null;
        if(StringUtils.length(dateStr) == date_pattern.length()) {
            dateTimeFormatter = DateTimeFormatter.ofPattern(date_pattern, Locale.ENGLISH);
        } else if(StringUtils.length(dateStr) == local_date_time_pattern.length()) {
            dateTimeFormatter = DateTimeFormatter.ofPattern(local_date_time_pattern, Locale.ENGLISH);
        }

        if(Objects.isNull(dateTimeFormatter)) {
            return null;
        }

        final LocalDateTime parseLocalDateTime = LocalDateTime.parse(dateStr, dateTimeFormatter);
        return format(parseLocalDateTime, default_pattern);
    }

    /**
     * 格式化时间
     * @param localDateTime 当前时间
     * @param pattern 样式
     * @return 格式化的日期字符串
     */
    public static String format(LocalDateTime localDateTime, String pattern) {
        final DateTimeFormatter formatter = DateTimeFormatter.ofPattern(pattern);
        return formatter.format(localDateTime);
    }

    /**
     * 获取北京时间
     * @return LocalDateTime
     */
    public static LocalDateTime getBeijingTime() {
        return LocalDateTime.now(ZoneOffset.of("+8"));
    }

    /**
     * 获取墨西哥时间
     * @return LocalDateTime
     */
    public static LocalDateTime getMexicoTime() {
        return localDateTime("-6");
    }

    /**
     * 获取格林威治时间（0 时区）
     * @return LocalDateTime
     */
    public static LocalDateTime getGMTTime() {
        return LocalDateTime.now(ZoneOffset.of("+0"));
    }

    /**
     * 生成 LocalDateTime
     * @param zoneId 时区名称
     * @return LocalDateTime
     */
    public static LocalDateTime localDateTime(String zoneId) {
        return ZonedDateTime.now(ZoneId.of(zoneId)).toLocalDateTime();
    }

}