package utils

import (
	"fmt"
	"time"
	_ "time/tzdata" // 挂载时区数据库 否则docker报错
)

var sysLoc *time.Location

func loc() *time.Location {
	if sysLoc == nil {
		var err error
		sysLoc, err = time.LoadLocation("Asia/Shanghai") // 设置系统为东八区 -- 具体根据项目更改
		if err != nil {
			panic(err)
		}
	}
	return sysLoc
}

const MonthDateTimeFormatLayout = "01-02 15:04:05"

const DateTimeFormatLayout = "2006-01-02 15:04:05"
const MonthFormatLayout = "2006-01"

func Time() time.Time {
	return time.Now().In(loc())
}

func SecondsUntilSecond(targetDate string) (int64, error) {
	// 解析目标日期（注意时区处理）
	targetTime, err := time.ParseInLocation(DateTimeFormatLayout, targetDate, loc())
	if err != nil {
		return 0, fmt.Errorf("invalid date format, expected YYYY-MM-DD: %v", err)
	}
	// 计算时间差
	now := time.Now()
	duration := targetTime.Sub(now)

	// 返回总秒数（忽略纳秒部分）
	return int64(duration.Seconds()), nil
}

// 计算目标时间距离当前的剩余秒数

func SecondsUntil(targetDate string) (int64, error) {
	// 解析目标日期（注意时区处理）
	targetTime, err := time.ParseInLocation("2006-01-02", targetDate, loc())
	if err != nil {
		return 0, fmt.Errorf("invalid date format, expected YYYY-MM-DD: %v", err)
	}
	// 计算时间差
	now := time.Now()
	duration := targetTime.Sub(now)
	// 返回总秒数（忽略纳秒部分）
	return int64(duration.Seconds()), nil
}

func NextDate(dateStr string) (string, error) {
	dateTime, err := ParseDateInLocation(dateStr)
	if err != nil {
		return "2006-01-02", err
	}
	return dateTime.AddDate(0, 0, 1).Format(DateFormatLayout), nil
}

func TimeMonth() string {
	return Time().Format(MonthFormatLayout)
}

func NowDateTimeSec() string {
	return Time().Format(DateTimeFormatLayout)
}

func ParseDateCheck(dateStr string) (string, error) {
	_, err := time.Parse("2006-01-02", dateStr)
	if err != nil {
		return dateStr, fmt.Errorf("日期解析错误:%s", err)
	}
	return dateStr, nil
}

func ParseTimeStamp(timestamp int64) time.Time {
	return time.Unix(timestamp, 0).In(loc())
}

func NowTimeSecStr() string {
	return time.Now().Format(DateTimeFormatLayout)
}

func ParseTimeStampToDateTimeStr(timestamp int64) string {
	return ParseTimeStamp(timestamp).Format(DateTimeFormatLayout)
}

func ParseStampToMonthDateStr(timestamp int64) string {
	return ParseTimeStamp(timestamp).Format(MonthDateTimeFormatLayout)
}

func ParseTimeStampToDateStr(timestamp int64) string {
	return ParseTimeStamp(timestamp).Format(DateFormatLayout)
}

func TimeStamp() int64 {
	return Time().Unix()
}