package pkg

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

func init() {
	rand.Seed(time.Now().UnixNano())
}

func RandMac() string {
	return fmt.Sprintf("%02x:%02x:%02x:%02x:%02x:%02x", rand.Intn(256), rand.Intn(256), rand.Intn(256), rand.Intn(256), rand.Intn(256), rand.Intn(256))
}

func RandIp() string {
	return fmt.Sprintf("%d.%d.%d.%d", rand.Intn(256), rand.Intn(256), rand.Intn(256), rand.Intn(256))
}

func RandPort() uint16 {
	return uint16(rand.Intn(35536) + 30000)
}

func RandVni() uint32 {
	return uint32(rand.Intn(1 << 24))
}

func RandDstPort() uint16 {
	// 固定端口范围，流量好看点，也能发现是否有人拿我们流量去做其他测试
	ports := []uint16{
		80, 8080, 8081, 8082, 8083, 8084, 8085, 8086, 8087,
	}
	list := []int{
		8000, 10000, 12000, 14000, 16000, 18000, 20000, 22000, 24000,
	}
	for _, item := range list {
		for i := 0; i < 20; i++ {
			ports = append(ports, uint16(rand.Intn(30)+item))
		}
	}
	size := len(ports)
	return ports[rand.Intn(size)]
}