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

# shellcheck source=lib/git-tools.bash
. "$(dirname "$0")"/lib/git-tools.bash

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

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

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

if [ -z "${1:-}" ]; then
    usage
fi

version="$1"
prefix="zulip-server-$version"

require_clean_work_tree 'build a release tarball'

set -x
GITID=$(git rev-parse HEAD)

umask 022

OUTPUT_DIR=${OUTPUT_DIR:-$(mktemp -d)}
TARBALL=$OUTPUT_DIR/$prefix.tar
BASEDIR=$(pwd)

git archive -o "$TARBALL" "--prefix=$prefix/" HEAD

cd "$OUTPUT_DIR"
tar -xf "$TARBALL"
while read -r i; do
    rm -r --interactive=never "${OUTPUT_DIR:?}/$prefix/$i"
done <"$OUTPUT_DIR/$prefix/tools/release-tarball-exclude.txt"
tar -cf "$TARBALL" "$prefix"
rm -rf "$prefix"

if tar -tf "$TARBALL" | grep -q -e ^zerver/tests; then
    set +x
    echo "BUG: Excluded files remain in tarball!"
    exit 1
fi
cd "$BASEDIR"

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

# Add the Git version information file
if [[ "$version" =~ ^[0-9]+\.[0-9]+(-[0-9a-z]+)?$ ]]; then
    # We override the merge-base, to avoid having to push the commits before building the tarball.
    OVERRIDE_MERGE_BASE="$version" ./tools/cache-zulip-git-version
    generated_version=$(head -n1 zulip-git-version)
    if [ "$generated_version" != "$version" ]; then
        echo "Version $version looks like a release version, but is not tagged yet!  Got $generated_version"
        exit 1
    fi
else
    ./tools/cache-zulip-git-version
fi
mv zulip-git-version "$OUTPUT_DIR/$prefix/"

cd "$OUTPUT_DIR/$prefix"

ln -s "$BASEDIR/zulip-py3-venv" .

# 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 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

./tools/update-prod-static

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

echo "$GITID" >build_id
echo "$version" >version

cd "$OUTPUT_DIR"

tar --append -f "$TARBALL" "$prefix/prod-static" "$prefix/build_id" "$prefix/version" "$prefix/zulip-git-version" "$prefix/locale" "$prefix/staticfiles.json" "$prefix/templates/zerver/emails/compiled" "$prefix/webpack-stats-production.json"

rm -rf "$prefix"

gzip "$TARBALL"

set +x
TARBALL="$TARBALL.gz"

echo "Generated $TARBALL"