#!/bin/bash
# Exit immediately if anything goes wrong, instead of making things worse.
set -e

source $REPO_ROOT/bootstrap/shared/shared_functions.sh

################################################################################
# Function to remove VirtualBox DHCP servers
# By default, checks for any DHCP server on networks without VM's & removes them
# (expecting if a remove fails the function should bail)
# If a network is provided, removes that network's DHCP server
# (or passes the vboxmanage error and return code up to the caller)
# 
proc remove_DHCPservers {
  local network_name=$(1-)
  if [[ -z "$network_name" ]] {
    # make a list of VM UUID's
    local vms=$[VBoxManage list vms|sed 's/^.*{\([0-9a-f-]*\)}/\1/]
    # make a list of networks (e.g. "vboxnet0 vboxnet1")
    local vm_networks=$[for vm in [$vms] { \
      VBoxManage showvminfo --details --machinereadable $vm | \
      grep -i '^hostonlyadapter[2-9]=' | \
      sed -e 's/^.*=//' -e 's/"//g'; \
    } | sort -u]
    # will produce a regular expression string of networks which are in use by VMs
    # (e.g. ^vboxnet0$|^vboxnet1$)
    local existing_nets_reg_ex=$[sed -e 's/^/^/' -e 's/$/$/' -e 's/ /$|^/g' <<< $vm_networks]

    VBoxManage list dhcpservers | grep -E "^NetworkName:\s+HostInterfaceNetworking" | awk '{print $2}' |
    while read -r network_name {
      [[ -n $existing_nets_reg_ex ]] && ! egrep -q $existing_nets_reg_ex <<< $network_name && continue
      remove_DHCPservers $network_name
    }
  } else {
    VBoxManage dhcpserver remove --netname $network_name && local return=0 || local return=$Status
    return $return
  }
}

###################################################################
# Function to create all VMs using Vagrant
proc create_vagrant_vms {
  cd $REPO_ROOT/bootstrap/vagrant_scripts && vagrant up
}

# only execute functions if being run and not sourced
if [[ "${BASH_SOURCE[0]}" == "${0}" ]] {
  remove_DHCPservers
  create_vagrant_vms
}