#!/usr/bin/awk -f
#sta[n]["mac"]
#sta[n]["ip"]
#sta[n]["rssi"]
#sta[n]["rx pack"]
#sta[n]["tx pack"]
#iw dev wlan1 scan

BEGIN	{
i=0
}

{
if(match($0,"BSS")){
	if(i != 0)
	{
	sta[i-1]=sprintf("{\"mac\":\"%s\",  \"ssid\":\"%s\",\"channel\":\"%s\",  \"encryption\":\"%s\",\"width\":\"%s\", \"signal\":\"%s\" }\n",\
	mac,ssid,channel,encryption,width,signal)
	}

	split($2,array,/[(]/)
	mac=array[1]
	i++
}
else if(match($0,"SSID")){
	#system("mkdir -p /tmp/air_mac;" "echo " $2 " | base64 > /tmp/air_mac/" mac)
	while("echo -n" $2 " | base64" | getline)
	{
	ssid=$1
	}
}
else if(match($0,"primary channel")){
	channel=$4
}
else if(match($0,"Authentication")){
	encryption=$4
}
else if(match($0,"signal")){
	signal=$2
}
else if(match($1,"HT20") || match($1,"HT40") || match($1,"HT80") || match($1,"HT160")){
	width=$1
}
}

END{

	sta[i-1]=sprintf("{\"mac\":\"%s\",  \"ssid\":\"%s\",\"channel\":\"%s\",  \"encryption\":\"%s\",\"width\":\"%s\", \"signal\":\"%s\" }\n",\
	mac,ssid,channel,encryption,width,signal)
	
	head=sprintf("{\"beacon_list\":[")
	out=sprintf("%s",head)
	for(m=0; m<i; m++)
	{
	if(m == 0){
		out=sprintf("%s\n%s",out,sta[m])
	}
	else{	
		out=sprintf("%s,%s",out,sta[m])
	}
	}
	tail=sprintf("]}")
	out=sprintf("%s%s",out,tail)
	print  out
}