package com.jeesite.modules.utils;

import java.text.SimpleDateFormat;
import java.time.LocalDate;
import java.time.ZoneId;
import java.time.format.DateTimeFormatter;
import java.util.Date;

public class DateUtils {
    private static final DateTimeFormatter MONTH_FORMATTER = DateTimeFormatter.ofPattern("MM");
    private static final DateTimeFormatter YEAR_FORMATTER = DateTimeFormatter.ofPattern("yyyy");
    private static final DateTimeFormatter DATE_FORMATTER = DateTimeFormatter.ofPattern("yyyyMMdd");
    private static final DateTimeFormatter YEAR_MONTH_CN_FORMATTER = DateTimeFormatter.ofPattern("yyyy年MM月");

    private static final DateTimeFormatter SHORT_YEAR_MONTH_CN_FORMATTER = DateTimeFormatter.ofPattern("yy年MM月");


    public static String dsValue() {
        LocalDate currentDate = LocalDate.now();
        return currentDate.format(DATE_FORMATTER);
    }

    public static String dsValueDaysAgo(long days) {
        LocalDate targetDate = LocalDate.now().minusDays(days);
        return targetDate.format(DATE_FORMATTER);
    }

    public static String getCurrentYear() {
        LocalDate currentDate = LocalDate.now();
        return currentDate.format(YEAR_FORMATTER);
    }

    public static String getCurrentMonth() {
        LocalDate currentDate = LocalDate.now();
        return currentDate.format(MONTH_FORMATTER);
    }

    public static String getCurrentYearMonthCN() {
        LocalDate currentDate = LocalDate.now();
        return currentDate.format(YEAR_MONTH_CN_FORMATTER);
    }

    public static String getCurrentShortYearMonthCN() {
        LocalDate currentDate = LocalDate.now();
        return currentDate.format(SHORT_YEAR_MONTH_CN_FORMATTER);
    }

    public static String getYear(LocalDate date) {
        return date.format(YEAR_FORMATTER);
    }

    public static String getMonth(LocalDate date) {
        return date.format(MONTH_FORMATTER);
    }

    public static String getYear(Date date) {
        return getYear(dateToLocalDate(date));
    }

    public static String getMonth(Date date) {
        return getMonth(dateToLocalDate(date));
    }

    public static String getDate(String pattern) {
        return new SimpleDateFormat(pattern).format(new Date());
    }

    public static LocalDate dateToLocalDate(Date date) {
        return date.toInstant().atZone(ZoneId.systemDefault()).toLocalDate();
    }

    public static Date getFirstDayOfCurrentYear() {
        LocalDate firstDayOfYear = LocalDate.now().withDayOfYear(1);
        return Date.from(firstDayOfYear.atStartOfDay(ZoneId.systemDefault()).toInstant());
    }
}