package myth

import (
	"time"
)

const (
	// TimeFmtLong yyyy-MM-dd hh:mm:ss
	TimeFmtLong = `2006-01-02 15:04:05`
	// TimeFmtNumeric yyyyMMddhhmmss
	TimeFmtNumeric = `20060102150405`

	// DateFmtLong yyyy-MM-dd
	DateFmtLong = `2006-01-02`
	// DateFmtNumeric yyyyMMdd
	DateFmtNumeric = `20060102`
)

// IsTime 是否时间格式字符串
func IsTime(s string) bool {
	if _, err := time.Parse(TimeFmtLong, s); err != nil {
		return false
	}
	return true
}

// IsDate 是否为有效日期
func IsDate(s string) bool {
	if _, e := time.Parse(`2006-01-02`, s); e != nil {
		return false
	}
	return true
}

// StrToTime 字符串转时间
func StrToTime(s string) (t time.Time, err error) {
	t, err = time.Parse(TimeFmtLong, s)

	return
}

// StrFmtTime 时间转字符串
func StrFmtTime(s, fmt string) (t time.Time, err error) {
	t, err = time.Parse(fmt, s)
	return
}

// TimeToStr 时间转字符串
func TimeToStr(t time.Time) string {
	return t.Format(TimeFmtLong)
}

// TimeFmtStr 时间转字符串
func TimeFmtStr(t time.Time, fmt string) string {
	return t.Format(fmt)
}

// StrToDate 字符串转日期
func StrToDate(s string) (t time.Time, err error) {
	t, err = time.Parse(DateFmtLong, s)

	return
}

// IsWeekEnd 日期是否周末
func IsWeekEnd(d time.Weekday) bool {
	day := int(d)
	if day == 6 || day == 0 {
		return true
	}
	return false
}