package libs

import (
	"math"
	"math/rand"
	"time"
)

var letters = []rune("abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ")

func randStr(n int) string {
	b := make([]rune, n)
	for i := range b {
		b[i] = letters[rand.Intn(len(letters))]
	}
	return string(b)
}

func TradingTime(t time.Time) bool {
	if t.Weekday() == time.Saturday || t.Weekday() == time.Sunday {
		return false
	}
	second := t.Hour()*3600 + t.Minute()*60 + t.Second()
	return (second >= 9*3600+30*60 && second <= 11*3600+30*60) ||
		(second >= 13*3600 && second <= 15*3600)
}

func CalcBuyVolume(price, buyValue float64) int {
	if price <= 0 || buyValue <= 0 {
		return 0
	}
	// 不足一手时仍按最低一手委托。
	hands := int(math.Floor(buyValue / (price * 100)))
	if hands == 0 {
		hands = 1
	}
	return hands * 100
}