package common

import (
   "fmt"
   "strings"
   "time"
)

const DATE_FORMAT = "2006-01-02 15:04:05"
const DATE_FORMAT_YMD = "2006-01-02"

//獲取時間差， 返回天時分秒
func GetTimeDiffer(start, end time.Time) (d, h, m, s int64) {
   var day, hour, minute, second int64
   if start.Before(end) {
      timeDiffer := end.Unix() - start.Unix()
      day := timeDiffer / (60 * 60 * 24)
      hour := (timeDiffer - (60 * 60 * 24 * day)) / 3600
      minute := (timeDiffer - 60*60*24*day - 3600*hour) / 60
      second := timeDiffer - 60*60*24*day - 3600*hour - 60*minute
      return day, hour, minute, second
   } else {
      return day, hour, minute, second
   }

}
 

//獲取開始&結束時間 每天
func GetStartAndEndTime(date time.Time) (startTime string, endTime string) {
   startDate := time.Date(date.Year(), date.Month(), date.Day(), 0, 0, 0, 0, time.Local)
   endDate := time.Date(date.Year(), date.Month(), date.Day(), 23, 59, 59, 0, time.Local)
   startTime = startDate.Format("2006-01-02 15:04:05")
   endTime = endDate.Format("2006-01-02 15:04:05")
   return
}
 

//獲取開始&結束時間 每月
func GetStartAndEndTimeMonthlyDay(date time.Time) (startTime string, endTime string) {
   startDate := time.Date(date.Year(), date.Month(), 1, 0, 0, 0, 0, time.Local)
   endDate := time.Date(date.Year(), date.Month(), MonthDayCount(date.Year(), date.Month()), 23, 59, 59, 0, time.Local)
   startTime = startDate.Format("2006-01-02")
   endTime = endDate.Format("2006-01-02")
   return
}
 

//每月天數
func MonthDayCount(year int, month time.Month) (days int) {
   var m int
   m = int(month)
   if m != 2 {
      if m == 4 || m == 6 || m == 9 || m == 11 {
         days = 30

      } else {
         days = 31
      }
   } else {
      if ((year%4) == 0 && (year%100) != 0) || (year%400) == 0 {
         days = 29
      } else {
         days = 28
      }
   }
   return days
}

//格式化時間(字串轉time)  date 必須是 '2019-09-01 12:11:11' 格式
func GetTimeTypeByString(date string) time.Time {
   applyTime, _ := time.ParseInLocation("2006-01-02 15:04:05", date, time.Local)
   return applyTime
}

//格式化時間(字串轉time) date 必須是 '2019-09-01' 格式
func GetTimeDateTypeByString(date string) time.Time {
   applyTime, _ := time.ParseInLocation("2006-01-02", date, time.Local)
   return applyTime
}

func FormatTime(timestamp int64) string {
   if timestamp == 0 {
      timestamp = time.Now().Unix()
   }
   return time.Unix(timestamp, 0).Format("2006-01-02 15:04:05")
}
func GetDurationDays(startTime int64, endTime int64) []string {
   var result []string
   dayTime := int64(3600 * 24)
   nowTime := time.Now().Unix()
   if endTime == 0 || endTime > nowTime {
      endTime = nowTime
   }
   if startTime == 0 || startTime > nowTime {
      startTime = nowTime
   }
   for {
      if startTime > endTime {
         break
      }
      result = append(result, time.Unix(startTime, 0).Format("2006-01-02"))
      startTime += dayTime
   }
   return result
}