#!/usr/bin/env bash

set -u

SCRIPT_DIR="$(cd -- "$(dirname -- "${BASH_SOURCE[0]}")" && pwd -P)"
REPO_ROOT="$(cd -- "$SCRIPT_DIR/.." && pwd -P)"
PYTHON_EXE="${SYSTEM_SIMULATION_PYTHON:-$REPO_ROOT/.venv/bin/python}"
export SIMULATION_NUMERIC_ENGINE="${SIMULATION_NUMERIC_ENGINE:-native}"

if [[ "$PYTHON_EXE" != /* ]]; then
  PYTHON_EXE="$REPO_ROOT/$PYTHON_EXE"
fi

if [[ ! -x "$PYTHON_EXE" ]]; then
  echo "[ERROR] Python virtual environment was not found:" >&2
  echo "        $PYTHON_EXE" >&2
  echo >&2
  echo "Create it and install the backend dependencies first:" >&2
  echo "        python3 -m venv \"$REPO_ROOT/.venv\"" >&2
  echo "        \"$REPO_ROOT/.venv/bin/python\" -m pip install -r \"$REPO_ROOT/requirements.txt\"" >&2
  exit 1
fi

cd "$REPO_ROOT"

echo "Starting FastAPI at http://127.0.0.1:8000"
echo "Press Ctrl+C to stop the service."
echo

exec "$PYTHON_EXE" -m uvicorn app.main:app --host 127.0.0.1 --port 8000