#!/bin/bash
set -e

. /usr/share/debconf/confmodule

db_capb backup # allow to go back, for that we implement that STATE loop

debug()
{
    [ "${DEBCONF_DEBUG:-}" != "developer" ] || echo -e "D: $*" >&2
}

db_settitle neurodebian/title

if [ "$1" = "configure" ]; then
    # Must have been called in preinst state, so no nd-configurerepo
    # tool is yet installed, thus delay asking questions to
    # whenever will be called in postinst state
    which nd-configurerepo 1>/dev/null 2>&1 || exit 0
fi

# Create temporary directory which will be reused
export ND_AE_TEMPDIR=$(mktemp -d)
trap "rm -rf \"$ND_AE_TEMPDIR\"" TERM INT EXIT

neurodebian_releases="auto"

# This implements a simple state machine so the back button can be handled.
# taken from debconf demo example
STATE=1
while [ "$STATE" != 0 -a "$STATE" -lt 9 ]; do
    case $STATE in
		1)
			# allow to be overridden by environment variable as discussed with
			# ftpmaster
			if [ ! -z "${NEURODEBIAN_ENABLE:-}" ]; then
				case "${NEURODEBIAN_ENABLE}" in
					true|yes|YES|1) enable=true;;
					false|no|NO|0)  enable=false;;
					*) echo "ERROR: Non-supported value $NEURODEBIAN_ENABLE of NEURODEBIAN_ENABLE env variable. Use yes or no" >&2;
						exit 1;;
				esac
				db_set neurodebian/enable $enable
			fi
			db_input high neurodebian/enable || true
			;;
        2)
			neurodebian_releases="$(ND_IFS=', ' nd-configurerepo --print-releases)"
			debian_release="$(ND_IFS=', ' nd-configurerepo --print-release)"
			if [ -z "$debian_release" ]; then # just a failover
				debian_release="sid"
			fi
			debug "releases: $neurodebian_releases"
			db_subst neurodebian/release releases "$neurodebian_releases"
			db_subst neurodebian/release release  "$debian_release"
			db_input medium neurodebian/release || true
			;;
        3)
			neurodebian_mirrors="$(ND_IFS=', ' nd-configurerepo --print-mirrors)"
			debug "mirrors: $neurodebian_mirrors"
			db_subst neurodebian/mirror mirrors "$neurodebian_mirrors"
			db_input medium neurodebian/mirror || true
			mirror_selection_ret="$RET"
			debug "mirror select return: <$mirror_selection_ret>"
			;;
        4)  neurodebian_flavor="$(ND_IFS=', ' nd-configurerepo --print-flavor)"
			db_subst neurodebian/flavor flavor "$neurodebian_flavor"
			db_input medium neurodebian/flavor || true ;;
        5)  db_input medium neurodebian/components || true ;;
        6)  db_input low neurodebian/suffix || true ;;
        7)  db_input low neurodebian/overwrite || true ;;
        8)  db_input medium neurodebian/run-update-note || true ;;
    esac

    if db_go; then
		case $STATE in
			1)
				db_get neurodebian/enable # get new value
				if [ "$RET" = "false" ]; then
					# no need to proceed with further questions
					if ls /etc/apt/sources.list.d/neurodebian.sources*.list &>/dev/null; then
						# we have configuration present -- display a note about apt-get update
						STATE=8
					else
						STATE=100	# just go out -- nothing to do, nothing to inform about
					fi
					continue
				fi;;
# Ubuntus managed to remove netselect "to accompany apt-netselect"
# https://bugs.launchpad.net/ubuntu/+source/netselect/+bug/337377
# So for now remove this mandatory demanding of netselect for "best", and
# rely on logic in nd-configurerepo to select default mirror (currently origin)
# as the 'best'
#
#			3)
#				db_metaget neurodebian/mirror value
#				selected_mirror="$RET"
#				# TODOs:
#				# - handle custom
#				# - separate out alias from url
#				debug "selected mirror: $selected_mirror"
#				if [ "$selected_mirror" = "best" ] && ! which netselect &>/dev/null; then
#					if [ "$mirror_selection_ret" = "30 question skipped" ]; then
#						# if the question was not even shown, we would
#						# not get a chance to specify mirror, thus
#						# better just fail altogether and demand intervention
#						db_input high neurodebian/netselect-cannot-be-used
#						exit 1
#					else
#						db_input high neurodebian/netselect-not-found
#						continue;
#					fi
#				fi
		esac
        STATE=$(($STATE + 1))
    else
        STATE=$(($STATE - 1))
    fi
done

db_stop