#!/usr/bin/env bash
set -eux

usage() {
    echo "Usage: $0 [--py3] <ZULIP_VERSION>" >&2
    exit 1
}

args="$(getopt -o '' -l 'py3' -n "$0" -- "$@")"
eval "set -- $args"

py3=
while true; do
    case "$1" in
        --py3) py3=t; shift;;
        --) shift; break;;
        *) usage;;
    esac
done

GITID=$(git rev-parse HEAD)

if [ -z "${1:-}" ]; then
    usage
fi
version="$1"
prefix="zulip-server-$version"

if [ "$(uname)" = "Darwin" ]; then
    TMPDIR=/tmp/voyager-build
    rm -Rf "$TMPDIR"
    mkdir -p "$TMPDIR"
else
    TMPDIR=$(mktemp -d)
fi

if ! git diff --exit-code >/dev/null; then
    set +x
    echo "ERROR: tarballs builds are based on a commit hash so your changes "
    echo "will not be included; you should commit or stash them based on "
    echo "what you want and then try again."
    echo
    exit 1
fi

TMP_CHECKOUT=$TMPDIR/$prefix/
TARBALL=$TMPDIR/$prefix.tar

# .gitattributes lists the files that are not exported
git archive -o "$TARBALL" "--prefix=$prefix/" HEAD


if tar -tf "$TARBALL" | grep -q -e ^zerver/tests; then
	echo "Excluded files remain in tarball!";
	echo "Versions of git 1.8.1.1 - 1.8.1.6 have broken .gitattributes syntax";
	exit 1;
else
	echo "Check for excluded files passed";
fi

if [ "$py3" ]; then
    tools/replace-tarball-shebang \
        '#!/usr/bin/env python' '#!/usr/bin/env python3' \
        < "$TARBALL" > "$TARBALL.new"
    mv "$TARBALL.new" "$TARBALL"
fi

# Check out a temporary full copy of the index to generate static files
git checkout-index -f -a --prefix "$TMP_CHECKOUT"
cd "$TMP_CHECKOUT"

# create var/log directory in the new temporary checkout
mkdir -p "var/log"

# Some settings need to be updated for update-prod-static to work
#
# TODO: Would be much better to instead run the below tools with some
# sort of environment hack to make settings.VOYAGER=True so that we
# don't need to create this dummy secrets file.
cat >> zproject/prod_settings_template.py <<EOF
DEBUG = False
EOF
cat >> zproject/dev-secrets.conf <<EOF
[secrets]
local_database_password = ''
secret_key = 'not_used_here'
shared_secret = 'not_used_here'
avatar_salt = 'not_used_here'
rabbitmq_password = 'not_used_here'
initial_password_salt = 'not_used_here'
EOF

# update-prod-static generates the prod-static directory.
# See COLLECTSTATIC in settings.py
set +x
# We do a bit of gymnastics to have update-prod-static.log be easily
# visible to the user and end up in the same directory as the final
# release tarball.
USER_PROD_STATIC_LOGPATH="${TMPDIR}/update-prod-static.log"
BUILD_PROD_STATIC_LOGPATH="${TMP_CHECKOUT}/var/log/update-prod-static.log"
ln -nfs "$BUILD_PROD_STATIC_LOGPATH" "$USER_PROD_STATIC_LOGPATH"
set -x

./tools/update-prod-static || (
    set +x
    echo; echo -ne "\033[33mRunning update-prod-static failed. "
    echo -e "Check ${TMPDIR}/update-prod-static.log for more information.\033[0m"
    exit 1
)
echo "$GITID" > build_id
echo "$version" > version
rm -f "$USER_PROD_STATIC_LOGPATH"
mv "$BUILD_PROD_STATIC_LOGPATH" "$USER_PROD_STATIC_LOGPATH"

rm -f zproject/dev-secrets.conf

# We don't need duplicate copies of emoji with hashed paths, and they would break bugdown
find prod-static/serve/generated/emoji/images/emoji/ -regex '.*\.[0-9a-f]+\.png' -delete

cd "$TMPDIR"

tar --append -f "$TARBALL" "$prefix/prod-static" "$prefix/build_id" "$prefix/version" "$prefix/staticfiles.json" "$prefix/webpack-stats-production.json"

rm -rf "$prefix"

gzip "$TARBALL"
echo "Generated $TARBALL.gz"