#!/bin/bash
  #
  # Create isolated venv for translator service (.venv-translator).
  #
  set -euo pipefail
  
  PROJECT_ROOT="$(cd "$(dirname "$0")/.." && pwd)"
  cd "${PROJECT_ROOT}"
  
  VENV_DIR="${PROJECT_ROOT}/.venv-translator"

  TMP_DIR="${TRANSLATOR_PIP_TMPDIR:-${PROJECT_ROOT}/.tmp/translator-pip}"

  MIN_PYTHON_MAJOR=3
  MIN_PYTHON_MINOR=10
  
  python_meets_minimum() {
    local bin="$1"
    "${bin}" - <<'PY' "${MIN_PYTHON_MAJOR}" "${MIN_PYTHON_MINOR}"
  import sys
  
  required = tuple(int(value) for value in sys.argv[1:])
  sys.exit(0 if sys.version_info[:2] >= required else 1)
  PY
  }
  
  discover_python_bin() {
    local candidates=()
  
    if [[ -n "${PYTHON_BIN:-}" ]]; then
      candidates+=("${PYTHON_BIN}")
    fi
    candidates+=("python3.12" "python3.11" "python3.10" "python3")
  
    local candidate
    for candidate in "${candidates[@]}"; do
      if ! command -v "${candidate}" >/dev/null 2>&1; then
        continue
      fi
      if python_meets_minimum "${candidate}"; then
        echo "${candidate}"
        return 0
      fi
    done
  
    return 1
  }
  
  if ! PYTHON_BIN="$(discover_python_bin)"; then
    echo "ERROR: unable to find Python >= ${MIN_PYTHON_MAJOR}.${MIN_PYTHON_MINOR}." >&2
    echo "Set PYTHON_BIN to a compatible interpreter and rerun." >&2
    exit 1
  fi

  
  if ! command -v "${PYTHON_BIN}" >/dev/null 2>&1; then
    echo "ERROR: python not found: ${PYTHON_BIN}" >&2
    exit 1
  fi
  
  if [[ -d "${VENV_DIR}" && ! -f "${VENV_DIR}/bin/activate" ]]; then
    echo "Found broken venv at ${VENV_DIR}, recreating..."
    rm -rf "${VENV_DIR}"
  fi
  
  if [[ ! -d "${VENV_DIR}" ]]; then
    echo "Creating ${VENV_DIR}"
    "${PYTHON_BIN}" -m venv "${VENV_DIR}"
  else
    echo "Reusing ${VENV_DIR}"
  fi
  
  mkdir -p "${TMP_DIR}"
  export TMPDIR="${TMP_DIR}"
  PIP_ARGS=(--no-cache-dir)
  

  echo "Using Python=${PYTHON_BIN}"

  echo "Using TMPDIR=${TMPDIR}"
  "${VENV_DIR}/bin/python" -m pip install "${PIP_ARGS[@]}" --upgrade pip wheel
  "${VENV_DIR}/bin/python" -m pip install "${PIP_ARGS[@]}" -r requirements_translator_service.txt
  
  echo
  echo "Done."
  echo "Translator venv: ${VENV_DIR}"

  echo "Download local models: ./.venv-translator/bin/python scripts/translation/download_translation_models.py --all-local"

  echo "Start service: ./scripts/start_translator.sh"