NET_NAMES=(
‘ansible_edge: asedgebr0‘ 
‘smartcity_edge: scedgebr0‘ 
‘smartcity_cloud: sccloud0‘ 
‘ansible_cloud: asedgebr0‘)

declare -A NET_MACS
NET_MACS=(
[ansible_edge]=‘EDGE1:1 EDGE2:1 EDGE3:1 HUB:1‘
[smartcity_edge]=‘EDGE1:2 EDGE2:2 EDGE3:2 HUB:2‘ 
[smartcity_cloud]=‘CLOUD:2 HUB:3‘ 
[ansible_cloud]=‘CLOUD:1‘)

IP=192.168.124.2

MODE=route # route or nat

declare -A MACS=([EDGE1]="" [EDGE2]="" [EDGE3]="" [HUB]="" [CLOUD]="")

function genmac(){
cat <<EOF | python3
import random
#
def randomMAC():  
  mac = [ 0x00, 0x16, 0x3e,
          random.randint(0x00, 0x7f),
          random.randint(0x00, 0xff),
          random.randint(0x00, 0xff) ]
  return ‘:‘.join(map(lambda x: "%02x" % x, mac))
print(randomMAC())
EOF
}

# declare -A EDGE1_MACS EDGE2_MACS EDGE3_MACS HUB_MACS CLOUD_MACS

# MACS=(EDGE1_MACS EDGE2_MACS EDGE3_MACS HUB_MACS CLOUD_MACS)
# above 4.3 alpha version support nameref
# declare -A MACS=([EDGE1]="" [EDGE2]="" [EDGE3]="" [HUB]="" [CLOUD]="")
END=5
for i in "${!MACS[@]}"; do
  for j in $(seq 1 $END); do MACS[$i]=$(genmac)" "${MACS[$i]}; done 
  echo "export ${i}_MACS=\"${MACS[$i]}\"" >> ~/.bashrc
done

# declare -p NET_MACS
# get_net_macs NET_MACS ansible_edge
function get_net_macs(){
  # $1 net macs map NET_MACS, $2 net mames, $3 macs pool
  mac_idxs=$(eval "echo \${$1[$2]}") 
  # IFS=‘, ‘ read -r -a array <<< "$string" 
  # array=(${string//:/ }) 
  macstr=($mac_idxs)
  # return value
  ret=()
  for v in "${macstr[@]}"; do
    host=${v%%:*}     idx=${v##*:}    macs=${v%%:*}_MACS
    string=$(eval "echo \${$macs}")
    # IFS=‘, ‘ array=($countries)
    array=($string)
    # echo "\${array[${!idx}]}"
    mac=$(eval "echo \${array[${idx}]}")
    ret+=($mac)
  done
  echo ${ret[@]}
}

# gen_host_array NET_MACS ansible_edge 
function gen_host_array(){
  # $1 net macs map NET_MACS, $2 net mames, $3 base ip addr
  mac_idxs=$(eval "echo \${$1[$2]}") 
  HOST=${mac_idxs//:/.}
  echo ${HOST,,}
}

# inc_subnet 192.168.124.1 3
function inc_subnet(){
  SUBN=${1#*.*.}
  SUBN=${SUBN%.*}
  SUFFIX=${1##*.}
  echo ${1%.*.*}.$((${SUBN} + ${2})).${SUFFIX}
}

# inc_ipaddr 192.168.124.1 3
function inc_ipaddr(){
  echo ${1%.*}.$((${1##*.} + $2))
}

# gen_ip_array NET_MACS smartcity_edge 192.168.127.1
function gen_ip_array(){
  # $1 net macs map NET_MACS, $2 net mames, $3 base ip addr
  mac_idxs=$(eval "echo \${$1[$2]}") 
  macstr=($mac_idxs)
  len=${#macstr[@]}
  ret=()
  for (( i=0; i<$len; i++ )); do
    ip=$(inc_ipaddr $3 $i); 
    ret+=($ip)
  done
  echo ${ret[@]}
}

function get_dhcp_item(){
  # $1 MAC, $2 HOST, $3 DOMAIN, $4 IP
  DOM=${3/_/.}
  # (IFS=$‘;‘;  echo "      <host mac=\"$1\" name=\"${2,,}.${DOM,,}.com\" ip=\"$4\"/>")
  echo "      <host mac=\"$1\" name=\"${2,,}.${DOM,,}.com\" ip=\"$4\"/>"
}

# gen_dhcp_items NET_MACS ansible_edge 192.168.124.192
function gen_dhcp_items(){
  # $1 net macs map NET_MACS, $2 net mames, $3 base ip addr
  hosts=$(gen_host_array $1 $2)  
  macs=$(get_net_macs $1 $2)
  ips=$(gen_ip_array $1 $2 $3)
  ha=($hosts)   hm=($macs)  hi=($ips)
  ret=()
  for i in ${!ha[@]}; do
    itm=$(get_dhcp_item ${hm[$i]} ${ha[$i]} $2 ${hi[$i]})
    # declare -p itm
    ret+=("$itm")
    # echo ${ha[$i]} ${hm[$i]} ${hi[$i]}
  done
  # echo ${ret[@]}
  # declare -p ret
  ( IFS=$‘\n‘; echo "${ret[*]}" )
}

# gen_dhcp_items NET_MACS ansible_edge 192.168.124.192
function gen_dhcp_items(){
  # $1 net macs map NET_MACS, $2 net mames, $3 base ip addr
  hosts=$(gen_host_array $1 $2)  
  macs=$(get_net_macs $1 $2)
  ips=$(gen_ip_array $1 $2 $3)
  ha=($hosts)   hm=($macs)  hi=($ips)
  ret=()
  for i in ${!ha[@]}; do
    itm=$(get_dhcp_item ${hm[$i]} ${ha[$i]} $2 ${hi[$i]})
    # declare -p itm
    ret+=("$itm")
    # echo ${ha[$i]} ${hm[$i]} ${hi[$i]}
  done
  # echo ${ret[@]}
  # declare -p ret
  ( IFS=$‘\n‘; echo "${ret[*]}" )
}


# gen_networt_xml ansible_edge asedgebr0 192.168.124.1 $dhcp nat 
function gen_networt_xml(){
# $1 NET_NAME $2 BR NAME $3 IP $4 DHCP $5 MODE
str="<network>
  <name>$1</name>
  <bridge name=\"$2\"/>
  <forward mode=\"${5}\"/>
  <ip address=\"${3%.*}.1\" netmask=\"255.255.255.0\">
    <dhcp>
      <range start=\"${3%.*}.2\" end=\"${3%.*}.192\"/>
$4
    </dhcp>
  </ip>
</network>"
cat | tee /tmp/vir_network.xml << EOF
<network>
  <name>$1</name>
  <bridge name="$2"/>
  <forward mode="${5}"/>
  <ip address="${3%.*}.1" netmask="255.255.255.0">
    <dhcp>
      <range start="${3%.*}.2" end="${3%.*}.192"/>
$4
    </dhcp>
  </ip>
</network>
EOF
# declare -p str
}


# gen_networt_xmls NET_NAMES $NET_MACS 192.168.124.1 nat 
# gen_networt_xmls NET_NAMES $NET_MACS 
function gen_networt_xmls(){
# $1 NET_NAMES $2 NET_MACS $3 IP $4 MODE: nat or route
IP=${3:-192.168.124.2}
for i in $(eval "echo \${!$1[@]}"); do
  v=$(eval "echo \${$1[i]}")
  NM=${v%:*}    BR=${v#*: }
  ip=$(inc_subnet $IP $i)
  dhcp=$(gen_dhcp_items $2 $NM $ip)
  gen_networt_xml $NM $BR $IP "$dhcp" ${4:-nat}
done
}