#!/bin/bash
set -euo pipefail

PYTHON_BIN="${PYTHON_BIN:-python3.12}"
VENV_DIR="${VENV_DIR:-.venv}"

if ! command -v "$PYTHON_BIN" >/dev/null 2>&1; then
  echo "ERROR: $PYTHON_BIN not found. Install Python 3.12+ and retry." >&2
  exit 1
fi

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

source "$VENV_DIR/bin/activate"
pip install --upgrade pip
pip install -r "$(dirname "$0")/requirements-lock.txt"

echo "Virtualenv ready at $VENV_DIR using $PYTHON_BIN"