#!/bin/bash


set -aeou pipefail

SCRIPTDIR="$( cd "$( dirname "${BASH_SOURCE[0]}" )" &> /dev/null && pwd )"

function printHelp(){
    cat << EOF
Usage ${0##*/} [options..]
-h,-?, --help       Show help and exit
-N, --network       configure network settings
-s, --salt          run a masterless salt-call
-y, --yes           answer 'yes' on all questions
EOF
}


function asktobreak(){
    if [[ "$ANSWER_YES" == true ]];then
        printf "\n"
        return 1
    fi
    printf "Do you want to run this step (y/n)"
    while read -r -n 1 -s answer; do
        if [[ $answer == [YyNn] ]];then
            [[ $answer == [Yy] ]] && return_value=1
            [[ $answer == [Nn] ]] && return_value=0
            printf "\n"
            break;
        fi
    done
    return $return_value
}

function new_log(){
    # script output
    printf "\n****  [%s]  ***\n" "$*"
}

function log(){
    printf "%s\n" "$*"
}

function parse_yaml() {
    # ripped from https://gist.github.com/pkuczynski/8665367#gistcomment-2174214
    local yaml_file=$1
    local prefix=$2
    local s
    local w
    local fs

    s='[[:space:]]*'
    w='[a-zA-Z0-9_]*'
    fs="$(echo @|tr @ '\034')"

    (
        sed -ne 's/--//g; s/\"/\\\"/g; s/\#.*//g; s/\s*$//g;' \
            -e  "s|^\($s\)\($w\)$s:$s\"\(.*\)\"$s\$|\1$fs\2$fs\3|p" \
            -e "s|^\($s\)\($w\)$s[:-]$s\(.*\)$s\$|\1$fs\2$fs\3|p" |
        awk -F"$fs" '{
            indent = length($1)/2;
            if (length($2) == 0) { conj[indent]="+";} else {conj[indent]="";}
            vname[indent] = $2;
            for (i in vname) {if (i > indent) {delete vname[i]}}
                if (length($3) > 0) {
                    vn=""; for (i=0; i<indent; i++) {vn=(vn)(vname[i])("_")}
                    printf("%s%s%s%s=(\"%s\")\n", "'"$prefix"'",vn, $2, conj[indent-1],$3);
                }
            }' |
        sed 's/_=/+=/g'
    ) < "$yaml_file"
}

function check_prerequisites(){
    set +e
    local answer
    type "$1" > /dev/null 2>&1
    RESULT=$?
    if [[ $RESULT != 0 ]];then
        printf "$1 is not installed, do your want to install it [y/N]?"
        read -r -n 1 -s answer;
        printf "\n"
        if [[ $answer == [yY] ]];then
            sudo zypper --non-interactive install "$1"
        fi
    fi
    set -e
}

function do_salt_call(){
    local salt="sudo salt-call --local --file-root $SCRIPTDIR/salt/states --pillar-root $SCRIPTDIR/salt/pillars"
    new_log "Running salt high state"
    if asktobreak;then
        return
    fi
    $salt state.apply pillar="{username: $USER}"
}

function configure_network(){
    new_log "Configure network"
    if asktobreak; then
        return
    fi
    eval $(parse_yaml salt/pillars/network.sls "SALT_")
    if [[ -f salt/pillars/local.sls ]];then
        eval $(parse_yaml salt/pillars/local.sls "SALT_")
    fi
    #configure internal interface
    sudo nmcli connection modify "$SALT_network_interface_internal" ipv4.addresses "${SALT_network_ip}/${SALT_network_netmask}"
    sudo nmcli connection modify "$SALT_network_interface_internal" ipv4.dns "127.0.0.1, 1.1.1.1, 1.1.1.2"
    sudo nmcli connection modify "$SALT_network_interface_internal" ipv4.method manual
    sudo nmcli connection down "$SALT_network_interface_internal" 
    sudo nmcli connection up "$SALT_network_interface_internal"

    #configure external interface
    if [[ $(nmcli connection show | grep -i $SALT_network_interface_external | wc -l) == 0 ]]; then 
        sudo nmcli connection add type vlan con-name "$SALT_network_interface_external" ifname "$SALT_network_interface_external" dev "$SALT_network_interface_internal" id "${SALT_network_interface_external#*.}"
    fi
    sudo nmcli connection modify "$SALT_network_interface_external" ipv4.method auto
    sudo nmcli connection up "$SALT_network_interface_external"

    #configure vlan interfaces
    local len=${#SALT_network_vlan__id[@]}
    for (( i=0; i<$len; i++ ));do
        ifname="vlan.${SALT_network_vlan__id[$i]}"
        if [[ $(nmcli connection show | grep -i "$ifname" | wc -l) == 0 ]]; then
            sudo nmcli connection add type vlan con-name "$ifname" ifname "$ifname" dev "$SALT_network_interface_internal" id "${SALT_network_vlan__id[$i]}"
        fi
	sudo nmcli connection modify "$ifname" ipv4.addresses "${SALT_network_vlan__address[$i]}/${SALT_network_vlan__netmask[$i]}"
	sudo nmcli connection modify "$ifname" ipv4.method manual
	sudo nmcli connection up "$ifname"
    done
    

}

#########################
#
#  Main Script
#
########################

#initialize all options
ALL=true
SALT=false
NETWORK=false
ANSWER_YES=false

while :; do
    case ${1-noop} in
        -h|-\?|--help)
            printHelp
            exit
            ;;
        -s|--salt)
            SALT=true
            ALL=false
            ;;
	-N|--network)
	    NETWORK=true
	    ALL=false
	    ;;
        -y|--yes)
            ANSWER_YES=true
            ;;
        --)                 #End of all options
            shift
            break
            ;;
        -?*)
            printf "'%s' is not a valid option\n" "$1" >&2
            exit 1
            ;;
        *)                 #Break out of case, no more options
            break
    esac
    shift
done

for cmd in git salt-minion curl;do
	check_prerequisites "$cmd"
done

[[ $ALL == true ]] || [[ $NETWORK == true ]] && configure_network
[[ $ALL == true ]] || [[ $SALT == true ]] && do_salt_call

printf "\n DONE!!!!!!!\n"