/*
 * Copyright 2020-2021 the original author(https://github.com/wj596)
 *
 * <p>
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 * </p>
 */
package dates

import (
	"time"
)

const (
	// 日期格式
	DayFormatter = "2006-01-02"
	// 日期时间格式--分
	DayTimeMinuteFormatter = "2006-01-02 15:04"
	// 日期时间格式--秒
	DayTimeSecondFormatter = "2006-01-02 15:04:05"
	// 日期时间格式--毫秒
	DayTimeMillisecondFormatter = "2006-01-02 15:04:05.sss"
	// 时间格式--秒
	TimeSecondFormatter = "15:04:05"
)

// 默认格式2006-01-02 15:04:05
func NowFormatted() string {
	return time.Now().Format(DayTimeSecondFormatter)
}

func NowLayout(layout string) string {
	return time.Now().Format(layout)
}

func Layout(date time.Time, layout string) string {
	return date.Format(layout)
}

func DefaultLayout(time time.Time) string {
	return time.Format(DayTimeSecondFormatter)
}

func FromDefaultLayout(str string) time.Time {
	loc, _ := time.LoadLocation("Local")
	theTime, _ := time.ParseInLocation(DayTimeSecondFormatter, str, loc)
	return theTime
}

// 当前的毫秒时间戳
func NowMillisecond() int64 {
	return time.Now().UnixNano() / 1e6
}

func PastDayDate(pastDay int) time.Time {
	return time.Now().AddDate(0, 0, -pastDay)
}

func FutureDayDate(futureDay int) time.Time {
	return time.Now().AddDate(0, 0, futureDay)
}

func WeekStartDayDate() time.Time {
	now := time.Now()
	offset := int(time.Monday - now.Weekday())
	if offset > 0 {
		offset = -6
	}
	weekStart := time.Date(now.Year(), now.Month(), now.Day(), 0, 0, 0, 0, time.Local).AddDate(0, 0, offset)
	return weekStart
}

func MonthStartDayDate() time.Time {
	year, month, _ := time.Now().Date()
	monthStart := time.Date(year, month, 1, 0, 0, 0, 0, time.Local)
	return monthStart
}