#!/bin/sh
# Deploy pobsync runtime into /opt/pobsync without pip/venv.
# Copies python package sources into /opt/pobsync/lib and installs a stable entrypoint in /opt/pobsync/bin.

set -eu

PREFIX="/opt/pobsync"

usage() {
  echo "Usage: $0 [--prefix /opt/pobsync]" >&2
  exit 2
}

while [ $# -gt 0 ]; do
  case "$1" in
    --prefix)
      [ $# -ge 2 ] || usage
      PREFIX="$2"
      shift 2
      ;;
    -h|--help)
      usage
      ;;
    *)
      echo "Unknown arg: $1" >&2
      usage
      ;;
  esac
done

# Determine repo root from this script location
SCRIPT_DIR="$(CDPATH= cd -- "$(dirname -- "$0")" && pwd)"
REPO_ROOT="$(CDPATH= cd -- "${SCRIPT_DIR}/.." && pwd)"

SRC_PKG="${REPO_ROOT}/src/pobsync"
if [ ! -d "${SRC_PKG}" ]; then
  echo "ERROR: expected python package at ${SRC_PKG}" >&2
  exit 1
fi

BIN_DIR="${PREFIX}/bin"
LIB_DIR="${PREFIX}/lib"
DST_PKG="${LIB_DIR}/pobsync"
BUILD_FILE="${DST_PKG}/_build.txt"

mkdir -p "${BIN_DIR}" "${LIB_DIR}"

# Copy code into /opt/pobsync/lib/pobsync
# We use rsync if available (clean updates with --delete), otherwise fall back to cp -a.
if command -v rsync >/dev/null 2>&1; then
  rsync -a --delete \
    --exclude '__pycache__/' \
    --exclude '*.pyc' \
    --exclude '*.pyo' \
    --exclude '*.pyd' \
    "${SRC_PKG}/" "${DST_PKG}/"
else
  # Fallback: wipe + copy
  rm -rf "${DST_PKG}"
  mkdir -p "${DST_PKG}"
  cp -a "${SRC_PKG}/." "${DST_PKG}/"
fi

# Write build info (best-effort)
GIT_SHA="unknown"
if command -v git >/dev/null 2>&1 && [ -d "${REPO_ROOT}/.git" ]; then
  GIT_SHA="$(cd "${REPO_ROOT}" && git rev-parse HEAD 2>/dev/null || echo unknown)"
fi

NOW_UTC="$(date -u +"%Y-%m-%dT%H:%M:%SZ" 2>/dev/null || echo unknown)"
{
  echo "deployed_at_utc=${NOW_UTC}"
  echo "git_sha=${GIT_SHA}"
  echo "repo_root=${REPO_ROOT}"
} > "${BUILD_FILE}"

# Install stable entrypoint that always runs code from /opt/pobsync/lib
WRAPPER="${BIN_DIR}/pobsync"
cat > "${WRAPPER}" <<EOF
#!/bin/sh
# managed-by=pobsync deploy
set -eu

PREFIX="${PREFIX}"
export PYTHONPATH="\${PREFIX}/lib"
export PYTHONUNBUFFERED=1

exec /usr/bin/python3 -m pobsync "\$@"
EOF

chmod 0755 "${WRAPPER}"

echo "OK"
echo "- deployed package to ${DST_PKG}"
echo "- wrote build info ${BUILD_FILE}"
echo "- installed entrypoint ${WRAPPER}"