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

ROOT_DIR="$(cd -- "$(dirname -- "${BASH_SOURCE[0]}")" && pwd)"
BACKEND_HOST="${BACKEND_HOST:-127.0.0.1}"
BACKEND_PORT="${BACKEND_PORT:-8000}"
FRONTEND_HOST="${FRONTEND_HOST:-127.0.0.1}"
FRONTEND_PORT="${FRONTEND_PORT:-5173}"
PYTHON_BIN="${PYTHON_BIN:-python3}"
BACKEND_VENV="${ROOT_DIR}/backend/.venv"
BACKEND_PYTHON="${BACKEND_VENV}/bin/python"

cleanup() {
    local pids
    pids="$(jobs -pr || true)"
    if [[ -n "${pids}" ]]; then
        kill ${pids} 2>/dev/null || true
    fi
}

trap cleanup INT TERM EXIT

if [[ ! -f "${ROOT_DIR}/backend/app/main.py" ]]; then
    echo "Backend entrypoint not found: backend/app/main.py"
    exit 1
fi

if [[ ! -f "${ROOT_DIR}/frontend/package.json" ]]; then
    echo "Frontend package manifest not found: frontend/package.json"
    exit 1
fi

if [[ ! -f "${ROOT_DIR}/backend/requirements.txt" ]]; then
    echo "Backend requirements not found: backend/requirements.txt"
    exit 1
fi

command -v "${PYTHON_BIN}" >/dev/null 2>&1 || {
    echo "Python executable not found: ${PYTHON_BIN}"
    exit 1
}

command -v npm >/dev/null 2>&1 || {
    echo "npm is required to start the frontend"
    exit 1
}

if [[ ! -x "${BACKEND_PYTHON}" ]]; then
    echo "Creating backend virtual environment..."
    "${PYTHON_BIN}" -m venv "${BACKEND_VENV}"
fi

if ! "${BACKEND_PYTHON}" -c 'import build123d, dotenv, fastapi, httpx, jsonschema, multipart, uvicorn' >/dev/null 2>&1; then
    echo "Installing backend dependencies..."
    "${BACKEND_PYTHON}" -m pip install -r "${ROOT_DIR}/backend/requirements.txt"
fi

if [[ ! -d "${ROOT_DIR}/frontend/node_modules/next" ]]; then
    echo "Installing frontend dependencies..."
    (
        cd "${ROOT_DIR}/frontend"
        if [[ -f package-lock.json ]]; then
            npm ci
        else
            npm install
        fi
    )
fi

echo "Starting backend on ${BACKEND_HOST}:${BACKEND_PORT}"
(
    cd "${ROOT_DIR}/backend"
    "${BACKEND_PYTHON}" -m uvicorn app.main:app \
        --host "${BACKEND_HOST}" \
        --port "${BACKEND_PORT}" \
        --reload
) &

echo "Starting frontend on ${FRONTEND_HOST}:${FRONTEND_PORT}"
(
    cd "${ROOT_DIR}/frontend"
    npm run dev -- \
        -H "${FRONTEND_HOST}" \
        -p "${FRONTEND_PORT}"
) &

echo "Frontend: http://${FRONTEND_HOST}:${FRONTEND_PORT}"
echo "Backend:  http://${BACKEND_HOST}:${BACKEND_PORT}"
echo "Press Ctrl+C to stop both services."

wait