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

APP_DIR="${APP_DIR:-/opt/hw}"
ENV_FILE="${ENV_FILE:-/etc/hw/hw.env}"
SERVICE_NAME="${SERVICE_NAME:-hw}"
RUN_SEED_ALL="${RUN_SEED_ALL:-0}"

require_root() {
  if [[ "${EUID}" -ne 0 ]]; then
    printf 'Please run this script as root.\n' >&2
    exit 1
  fi
}

require_file() {
  local path="$1"
  if [[ ! -f "$path" ]]; then
    printf 'Required file not found: %s\n' "$path" >&2
    exit 1
  fi
}

main() {
  require_root
  require_file "$ENV_FILE"
  require_file "$APP_DIR/requirements.txt"
  require_file "$APP_DIR/run.py"

  set -a
  # shellcheck disable=SC1090
  source "$ENV_FILE"
  set +a

  "$APP_DIR/.venv/bin/python" -m pip install --upgrade pip
  "$APP_DIR/.venv/bin/python" -m pip install -r "$APP_DIR/requirements.txt"

  export FLASK_APP=run.py
  export HW_CONFIG="${HW_CONFIG:-production}"

  (cd "$APP_DIR" && "$APP_DIR/.venv/bin/python" -m flask db upgrade)

  if [[ "$RUN_SEED_ALL" == "1" ]]; then
    (cd "$APP_DIR" && "$APP_DIR/.venv/bin/python" -m flask seed-all)
  fi

  systemctl daemon-reload
  systemctl restart "$SERVICE_NAME"
  systemctl enable "$SERVICE_NAME"

  printf 'Deployment completed.\n'
  printf 'Use: systemctl status %s --no-pager\n' "$SERVICE_NAME"
}

main "$@"