#!/usr/bin/env sh
dependencies="sed test cp libreoffice expr"
assert_tools () {
	while test $# -gt 0; do
		which $1  >/dev/null 2>/dev/null || {
			echo "tool missing: "$1
			exit 2
		}
		shift
	done
}
assert_tools ${dependencies}

testcmp () {
	# usage: testcmp "cmpresult" "cmdfunctionname"  [ "argument1", "argument2", […] ]
	if test "$#" -eq 0 ; then
		echo "arguments missing."; exit 1
	fi
	case $2 in 
	#whitelisted fn
	chklength)
		expect="$1"; shift
		fn="$1"; shift
		result=$("$fn" "$1" "$2")
		if test "$result" = "$expect" ; then
			echo "$fn passed for: $1 $2."
		else
			echo "$fn failed for: $1 $2."
		fi
	;;
	iso3countrycode)
		expect="$1"; shift
		fn="$1"; shift
		for a in "$@"; do 
			result=$("$fn" "$a")
			if test "$result" = "$expect" ; then
				echo "$fn passed for: $a."
			else
				echo "$fn failed for: $a."
			fi
		done
	;;
	*)
		echo "no test performed, function or command not allowd."
	esac
}

chklength () {
	test "$#" -eq "0" && { echo "-1"; }
	expect="$1"; shift
	result=$(expr length "$1")
	test "$expect" -eq "$result" && { echo "true"; } || { echo "$result"; }
}

testchklength () {
	chklength "3" "123"
	testcmp "true" "chklength" "3" "123"
	testcmp "3" "chklength" "2" "1-2"
}

# target filename
tn="dhl-cp1252.csv"

# todo: download file (its UTF-8 encoded)

fn="dhl.csv"
# backup
cp -f "${fn}" "${fn}.bak"

# replace special spaces and hyphens
sed -i -e 's/[\u00A0\u202F[:space:]]+/ /g' -e 's/[\u2010\u2011\u2012\u2013\u002D]+/-/g' -e 's/[\u00AD\uFEFF]+//g' "$fn"

# todo: validate length for entries

# todo: convert country to countrycode as in ISO3
iso3countrycode () {
	if test "$#" -eq 0 ; then
		echo "argument missing. ($0)"
	else
		case "$1" in
			Belgien) echo "BEL";;
			Deutschland) echo "DEU";;
			England) echo "GBR";;
			Luxemburg|Luxembourg) echo "LUX";;
			Niederlande) echo "NLD";;
			Österreich) echo "AUT";;
			Schweiz) echo "CHE";;
			Ungarn) echo "HUN";;
			*) echo "unknown country: $1";exit 1;; 
		esac
	fi
}

testiso3 () {
	# covering data in https://doku.ccc.de/index.php?title=Attribut:Chaostreff-Country&limit=500&offset=0
	testcmp "BEL" "iso3countrycode" "Belgien"
	testcmp "DEU" "iso3countrycode" "Deutschland"
	testcmp "GBR" "iso3countrycode" "England"
	testcmp "LUX" "iso3countrycode" "Luxembourg" "Luxemburg"
	testcmp "NLD" "iso3countrycode" "Niederlande"
	testcmp "AUT" "iso3countrycode" "Österreich"
	testcmp "HUN" "iso3countrycode" "Ungarn"
	testcmp "CHE" "iso3countrycode" "Schweiz"
	testcmp "" "iso3countrycode" "Simbabwe" # should fail
}
#~ testiso3

# convert encoding from UTF-8 to CP1252 "Windows"
# another possibility for conversion? seems not to be relyable: iconv -o "$of" -f UTF-8 -t CP1252 "$if" 
convcsv () {
	if test $# -eq 0 ; then echo "argument missing."; exit 1; fi
	if test -e $1 ; then echo "file already exists."; exit 2; fi 
# doc for headless conversion options https://wiki.openoffice.org/wiki/Documentation/DevGuide/Spreadsheets/Filter_Options
	if="${1}"
	of=$(echo "${if}"|rev|cut -d. -f2-|rev)".ods"
	libreoffice --headless --convert-to ods --infilter=CSV:59,34,76,1 "${if}" && {
		mv "${if}" "${if}.bak"
		libreoffice --headless --infilter=CSV:59,34,76,1 --convert-to csv:"Text - txt - csv (StarCalc)":"44,34,1,0,1,,0" "${tf}" && {
			rm "${tf}" "${if}.bak"
		}
	}
}
convcsv "$fn"