#!/bin/bash

die() {
    echo "error: $@" >&2
    exit 1
}

test "$#" -gt 0 || die "Usage: $0 <package identifier>"
test "$(uname -s)" = "Darwin" || die "Must be run under macOS"
test $(id -u) -eq 0 || die "Must be root"
which -s pkgutil || die "pkgutil not available. Install XCode"

APP="$1"

pkgutil --pkg-info "$APP" > /dev/null || die "No found app by this package identifier"
for key in volume location
do
   EXP="^$key: "
   VAL=$(pkgutil --pkg-info "$APP" | grep "$EXP" | sed "s/$EXP//")
   eval $key=\$VAL
done

BASE="$volume$location"

test -d "$BASE" || die "Resolved base directory '$BASE' doesn't exist"

pushd "$BASE"
pkgutil --only-files --files "$APP" | tr '\n' '\0' | xargs -0 -n 1 rm
pkgutil --only-dirs --files "$APP" | sort -r | tr '\n' '\0' | xargs -0 -n 1 rmdir
popd

pkgutil --forget "$APP" || die "Failed to remove the package from the database"

echo "Done."