#!/usr/bin/env bash
# Prepare the virtual environment and install dependencies.
# Usage: bash scripts/bootstrap.sh

set -euo pipefail

SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]:-${0}}")" && pwd)"
PROJECT_ROOT="$(cd "${SCRIPT_DIR}/.." && pwd)"
VENV_DIR="${PROJECT_ROOT}/.venv"
PYTHON_BIN="${PYTHON_BIN:-python3}"

if ! command -v "${PYTHON_BIN}" >/dev/null 2>&1; then
  echo "Python interpreter '${PYTHON_BIN}' not found. Set PYTHON_BIN to override." >&2
  exit 1
fi

if [ ! -d "${VENV_DIR}" ]; then
  echo "Creating virtual environment at ${VENV_DIR}"
  "${PYTHON_BIN}" -m venv "${VENV_DIR}"
else
  echo "Reusing existing virtual environment at ${VENV_DIR}"
fi

"${VENV_DIR}/bin/python" -m pip install --upgrade pip
REQ_FILE="${PROJECT_ROOT}/requirements.txt"
if [ -f "${REQ_FILE}" ]; then
  "${VENV_DIR}/bin/pip" install -r "${REQ_FILE}"
else
  echo "requirements.txt not found at ${REQ_FILE}" >&2
fi

cat <<'EOF'
Virtual environment ready.
Use the helper scripts in scripts/ to run the app, tests, or build artefacts.
EOF