#!/bin/bash
set -e
if [ $EUID -ne 0 ]; then
    echo "Run with root permissions" >&2
    exit 1
fi
if [ $# -ne 1 ] || ! [[ "$1" =~ ^(.*/)?firefox-[0-9.]*.tar.bz2$ ]]; then
    echo "Usage: upgrade-firefox /path/to/firefox-<version>.tar.bz2" >&2
    exit 1
fi
if ! [ -f "$1" ]; then
    echo "File not exist" >&2
    exit 1
fi
version=$(basename "$1")
version=${version#firefox-}
version=${version%.tar.bz2}
if [ -d /opt/firefox-$version ]; then
    echo "This version of Firefox is already installed" >&2
    exit 1
fi
current=$(find /opt -maxdepth 1 | grep -oP '/opt/firefox-\K\d.*' \
    | LC_ALL=C sort -rV | head -1)
if dpkg --compare-versions "$current" ge "$version"; then
    echo "This version of Firefox is not the latest" >&2
    exit 1
fi
tar xf "$1" -C /opt/ --transform 's/^firefox/firefox-'$version'/'
cat <<'END' > /opt/firefox-$version/CAN-BE-REMOVED
Installed through upgrade-firefox script
END
mkdir -p /opt/firefox-$version/distribution
cat > /opt/firefox-$version/distribution/policies.json <<'END'
{
  "policies": {
    "DisableAppUpdate": true,
    "DontCheckDefaultBrowser": true
  }
}
END
ln -sf -T firefox-$version /opt/firefox-latest
for old in $(find /opt -maxdepth 1 -name 'firefox-[1-9]*' | LC_ALL=C sort -rV \
        | tail +3); do
    [ -e "$old/CAN-BE-REMOVED" ] && rm -fr "$old"
done
echo "Done"
exit 0