#!/usr/bin/env bash
set -euo pipefail

SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
APP_HOME="$(cd "${SCRIPT_DIR}/.." && pwd)"
CONFIG_FILE="${APP_HOME}/config/catalogsync.env"
# shellcheck source=./load_env.sh
source "${SCRIPT_DIR}/load_env.sh"

fail() {
  echo "[install_runtime.sh] ERROR: $*" >&2
  exit 1
}

require_var() {
  local var_name="$1"
  if [[ -z "${!var_name:-}" ]]; then
    fail "Missing required config variable: ${var_name} (from ${CONFIG_FILE})"
  fi
}

require_requirement() {
  local requirement_name="$1"
  if ! grep -Eq "^${requirement_name}([<>=!~].*)?$" "${NAS_REQUIREMENTS_FILE}"; then
    fail "Missing required runtime dependency in requirements.txt: ${requirement_name}"
  fi
}

if [[ -f "${CONFIG_FILE}" ]]; then
  load_env_file "${CONFIG_FILE}"
else
  fail "Config file not found: ${CONFIG_FILE}. Copy catalogsync.env.example to catalogsync.env first."
fi

for required_var in APP_HOME DB_PATH LOG_DIR PYTHON_BIN VENV_DIR; do
  require_var "${required_var}"
done

if ! command -v "${PYTHON_BIN}" >/dev/null 2>&1; then
  fail "PYTHON_BIN is not executable or not found in PATH: ${PYTHON_BIN}"
fi

APP_DIR="${APP_HOME}/app"
REQUIREMENTS_FILE="${APP_DIR}/requirements.txt"
SETUP_FILE="${APP_DIR}/setup.py"
if [[ ! -f "${REQUIREMENTS_FILE}" ]]; then
  fail "requirements.txt not found: ${REQUIREMENTS_FILE}"
fi
if [[ ! -f "${SETUP_FILE}" ]]; then
  fail "setup.py not found: ${SETUP_FILE}"
fi

mkdir -p "${APP_HOME}" "${APP_DIR}" "${LOG_DIR}" "$(dirname "${DB_PATH}")"
export PYTHONPATH="${APP_DIR}${PYTHONPATH:+:${PYTHONPATH}}"

LOG_FILE="${LOG_DIR}/install_runtime_$(date +%Y%m%d_%H%M%S).log"
exec > >(tee -a "${LOG_FILE}") 2>&1
echo "[install_runtime.sh] logging to ${LOG_FILE}"

if [[ ! -d "${VENV_DIR}" ]]; then
  "${PYTHON_BIN}" -m venv "${VENV_DIR}"
fi

RUNTIME_PYTHON_BIN="${VENV_DIR}/bin/python"
if [[ ! -x "${RUNTIME_PYTHON_BIN}" ]]; then
  fail "Virtualenv python not found after setup: ${RUNTIME_PYTHON_BIN}"
fi

"${RUNTIME_PYTHON_BIN}" -m pip install --upgrade pip setuptools wheel

NAS_REQUIREMENTS_FILE="${APP_DIR}/requirements.nas.txt"
grep -v '^nodejs-wheel$' "${REQUIREMENTS_FILE}" > "${NAS_REQUIREMENTS_FILE}"
for runtime_requirement in fastapi uvicorn python-multipart; do
  require_requirement "${runtime_requirement}"
done
"${RUNTIME_PYTHON_BIN}" -m pip install -r "${NAS_REQUIREMENTS_FILE}"
"${RUNTIME_PYTHON_BIN}" -m pip install --no-deps -e "${APP_DIR}"

echo "[install_runtime.sh] runtime ready: ${RUNTIME_PYTHON_BIN}"