#!/bin/sh

set -e

# Source debconf library
. /usr/share/debconf/confmodule

service_supports_wildcards()
{
    service=$1
    ret=1

    case "$service" in
        ez-ip|dhs|dyndns|dyndns-static|easydns|easydns-partner)
            ret=0
        ;;
    esac

    return $ret
}

service_supports_mx()
{
    service=$1
    ret=1

    case "$service" in
        ez-ip|dhs|dyndns|dyndns-static|easydns|zoneedit)
            ret=0
        ;;
    esac

    return $ret
}

service_needs_server()
{
    service=$1
    ret=1

    case "$service" in
        gnudip)
            ret=0
        ;;
    esac

    return $ret
}

# I no longer claim this question, migrate it.
if db_get ez-ipupdate/daemon; then
    case "$RET" in
        true) db_set ez-ipupdate/ppp "false" ;;
        false) db_set ez-ipupdate/ppp "true" ;;
    esac
    db_unregister ez-ipupdate/daemon
fi

# I no longer claim this question either.
if db_get ez-ipupdate/manage_default_config_automatically; then
    case "$RET" in
        false) db_set ez-ipupdate/service_type "configure manually" ;;
    esac
    db_unregister ez-ipupdate/manage_default_config_automatically
fi

# Name the configuration file
conf=/etc/ez-ipupdate/default.conf

# Do you want debconf to manage the default configuration?
if [ -f "$conf" ]; then
    service="`sed -ne 's/^service-type *= *//p' < $conf`"
fi
if [ -n "$service" ]; then
    db_set ez-ipupdate/service_type "$service"
fi
db_input high ez-ipupdate/service_type || true
db_go

db_get ez-ipupdate/service_type
if [ "$RET" != "configure manually" ]; then
    if [ -f "$conf" ]; then
        # Grab existing values from config file
        if grep "^daemon" $conf > /dev/null 2>&1; then
            ppp="false"
        fi
        service="`sed -ne 's/^service-type *= *//p' < $conf`"
        server="`sed -ne 's/^server *= *//p' < $conf`"
        username="`sed -ne 's/^user *= *\([^:]*\):.*/\1/p' < $conf`"
        password="`sed -ne 's/^user *= *[^:]*://p' < $conf`"
        hostname="`sed -ne 's/^host *= *//p' < $conf`"
        interface="`sed -ne 's/^interface *= *//p' < $conf`"
        if grep "^wildcard" $conf > /dev/null 2>&1; then
            wildcard="true"
        fi
        dns_mx="`sed -ne 's/^mx *= *//p' < $conf`"
        # Poke the values into debconf
        if [ -n "$ppp" ]; then
            db_set ez-ipupdate/ppp "$ppp"
        fi
        if [ -n "$service" ]; then
            db_set ez-ipupdate/service_type "$service"
        fi
        if [ -n "$server" ]; then
            db_set ez-ipupdate/server "$server"
        fi
        if [ -n "$username" ]; then
            db_set ez-ipupdate/username "$username"
        fi
        if [ -n "$password" ]; then
            db_set ez-ipupdate/password "$password"
        fi
        if [ -n "$hostname" ]; then
            db_set ez-ipupdate/hostname "$hostname"
        fi
        if [ -n "$interface" ]; then
            db_set ez-ipupdate/interface "$interface"
        fi
        if [ "$wildcard" = true ]; then
            db_set ez-ipupdate/dns_wildcard true
        fi
        if [ -n "$dns_mx" ]; then
            db_set ez-ipupdate/dns_mx "$dns_mx"
        fi
    fi
    # Ask for new answers
    db_beginblock
    db_input high ez-ipupdate/ppp || true
    db_input high ez-ipupdate/username || true
    db_input high ez-ipupdate/password || true
    db_input high ez-ipupdate/hostname || true
    db_endblock
    db_go
    # Need to determine whether wildcards and MX records are supported
    # by the chosen service
    db_beginblock
    db_get ez-ipupdate/service_type
    service_type="$RET"
    if service_needs_server "$service_type"; then
        db_input high ez-ipupdate/server || true
    else
        db_set ez-ipupdate/server ""
    fi
    if service_supports_wildcards "$service_type"; then
        db_input medium ez-ipupdate/dns_wildcard || true
    else
        db_set ez-ipupdate/dns_wildcard false
    fi
    if service_supports_mx "$service_type"; then
        db_input medium ez-ipupdate/dns_mx || true
    else
        db_set ez-ipupdate/dns_mx ""
    fi
    db_endblock
    db_go
    # Check whether we really need to know the listening interface
    db_beginblock
    db_get ez-ipupdate/ppp
    ppp="$RET"
    if [ "$ppp" = "false" ]; then
        db_input high ez-ipupdate/interface || true
    fi
    db_endblock
    db_go
fi