#!/usr/bin/env bash
# Zero-downtime prod deploy: pull, sync deps, build front, migrate, then
# gracefully reload gunicorn (see polylan-submitter.service).
#
# Run from anywhere as the user owning the checkout (caddy), needs sudo for
# systemctl:
#   ./deploy/systemd/deploy.sh
#
# Migrations run while the old code still serves requests, so keep them
# backward compatible (nullable/default columns, drop/rename in a later deploy).

set -euo pipefail

SERVICE="${SERVICE:-polylan-submitter}"
# Extra units to restart after the web reload, e.g. RQ workers:
#   RESTART_SERVICES="polylan-submitter-worker" ./deploy/systemd/deploy.sh
RESTART_SERVICES="${RESTART_SERVICES:-}"

REPO_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")/../.." && pwd)"
APP_DIR="$REPO_DIR/polylan_submitter"
PYTHON="$REPO_DIR/.venv/bin/python"

# gunicorn's master doesn't reload itself on HUP, so a server upgrade needs a
# full restart instead.
server_versions() {
    "$PYTHON" - <<'EOF' 2>/dev/null || true
import importlib.metadata as m
for pkg in ("gunicorn", "uvicorn", "uvicorn-worker"):
    try:
        print(pkg, m.version(pkg))
    except m.PackageNotFoundError:
        print(pkg, "missing")
EOF
}

cd "$REPO_DIR"

echo "==> git pull"
git pull --ff-only

before="$(server_versions)"

echo "==> uv sync"
uv sync --frozen --no-dev

after="$(server_versions)"

echo "==> frontend build"
cd "$APP_DIR"
pnpm install --frozen-lockfile
pnpm build

echo "==> migrate"
"$PYTHON" manage.py migrate --noinput

echo "==> collectstatic"
"$PYTHON" manage.py collectstatic --noinput

if [ "$before" != "$after" ]; then
    echo "==> server packages changed, full restart of $SERVICE"
    sudo systemctl restart "$SERVICE"
else
    echo "==> graceful reload of $SERVICE"
    sudo systemctl reload "$SERVICE"
fi

for unit in $RESTART_SERVICES; do
    echo "==> restart $unit"
    sudo systemctl restart "$unit"
done

echo "==> done"