#!/bin/bash
#  $HeadURL$ $LastChangedRevision$

#  Modules
. $(miniade) || { echo "${0##*/}: ERROR: miniade failed (hint: run 'miniade' to see error)" >&2; exit 1; }

#  Configurable stuff

#  Other globals
IFNAME_REGEXP='^(lo|[a-z][a-z0-9]*[0-9])$'

main()
{
    local MY_ARGS
    #  Defaults for options
    OPT_FILE=			#  Can't set it to specific value because that is derived
    OPT_TOUCH=false

    #  Process options
    special_opts_handler()
    {
        case $1 in
            --file=*) OPT_FILE=${1#*=} ;;
            --touch)  OPT_TOUCH=true ;;
            *)        return 1 ;;
        esac
    }
    miniade_process_options --help-handler=help --special-opts-handler=special_opts_handler MY_ARGS "$@" && set -- "${MY_ARGS[@]}"

    #  Process arguments
    [ $# = 1 ] || miniade_bad_usage
    type encode > /dev/null 2>&1 || miniade_internal "encode: command not found (hint: is PATH set correctly?)"
    ENCODE_OUTPUT=$(encode --decode "$1") || miniade_internal "encode: failed (hint: see messages above)"
    eval set -- "$ENCODE_OUTPUT"
    [ $# -ge 2 ] || miniade_bad_usage
    IFNAME="$1"
    METHOD="$2"
    shift 2

    #  Sanity checks and derivations
    [[ $IFNAME =~ $IFNAME_REGEXP ]] || miniade_error "$IFNAME: invalid device"
    [[ $METHOD =~ ^(loopback|static|dhcp|nm|manual|external)$  ]] || miniade_error "$METHOD: invalid method"

    method_$METHOD "$@"
}

method_loopback()
{
    [ $# -eq 0 ] || miniade_bad_usage

    miniade_debug 10 "loopback: IFNAME=$IFNAME"
    ifdown --force $IFNAME 2> /dev/null || true
    sleep 2
    ifconfig $IFNAME down 2>/dev/null || true
    sleep 2
    echo -e "auto $IFNAME\niface $IFNAME inet loopback\n" > ${OPT_FILE:-/etc/network/interfaces.d/$IFNAME}
    ifup $IFNAME
}

method_static()
{
    [ $# -ge 3 ] || miniade_bad_usage
    IPADDR=$1
    NETMASK=$2
    GATEWAY_FLAG=$3
    [[ $GATEWAY_FLAG =~ ^(true|false)$ ]] || miniade_error "$GATEWAY_FLAG: invalid gateway flag"
    if $GATEWAY_FLAG; then
        [ $# = 4 ] || miniade_bad_usage
        GATEWAY_IPADDR=$4
    else
        [ $# = 3 ] || miniade_bad_usage
    fi

    miniade_debug 10 "method_static: IFNAME=$IFNAME, METHOD=$METHOD, IPADDR=$IPADDR, NETMASK=$NETMASK, GATEWAY_FLAG=$GATEWAY_FLAG"
    ifdown --force $IFNAME 2> /dev/null || true
    sleep 2
    ifconfig $IFNAME down 2>/dev/null || true
    sleep 2
    if $GATEWAY_FLAG; then
        echo -e "auto $IFNAME\niface $IFNAME inet $METHOD\n    address $IPADDR\n    netmask $NETMASK\n    gateway $GATEWAY_IPADDR\n" > ${OPT_FILE:-/etc/network/interfaces.d/$IFNAME}
    else
        echo -e "auto $IFNAME\niface $IFNAME inet $METHOD\n    address $IPADDR\n    netmask $NETMASK\n" > ${OPT_FILE:-/etc/network/interfaces.d/$IFNAME}
    fi
}

method_manual()
{
    [ $# = 0 ] || miniade_bad_usage
    ifdown --force $IFNAME 2> /dev/null || true
    sleep 2
    ifconfig $IFNAME down 2>/dev/null || true
    sleep 2
    echo -e "iface $IFNAME inet $METHOD\n" > ${OPT_FILE:-/etc/network/interfaces.d/$IFNAME}
}

method_external()
{
    [ $# = 0 ] || miniade_bad_usage
    ifdown --force $IFNAME 2> /dev/null || true
    sleep 2
    ifconfig $IFNAME down 2>/dev/null || true
    sleep 2
    
    echo -e "#  $IFNAME defined in a different file (probably because it's complicated.\nsource /etc/network/interfaces.d/$IFNAME\n" > ${OPT_FILE:-/etc/network/interfaces.d/$IFNAME}
}

help()
{
    local PROGNAME

    miniade_get_progname PROGNAME
    echo "Usage: $PROGNAME [ <standard-options> ] [ --file=<file> ] [ --touch ] <device>@<method>[@<ipaddr>@<netmask>@<gateway-flag>[@<gateway-ipaddr]]"
    exit 0
}

main "$@"