const PAPER_BASE_URL = 'https://paper-api.alpaca.markets';

function createAlpacaPaperClient({ keyId, secretKey } = {}) {
  if (!keyId || !secretKey) throw new Error('Alpaca paper credentials are required');
  async function request(path, options = {}) {
    const response = await fetch(`${PAPER_BASE_URL}${path}`, {
      ...options,
      headers: {
        'APCA-API-KEY-ID': keyId,
        'APCA-API-SECRET-KEY': secretKey,
        'Content-Type': 'application/json',
        ...(options.headers || {}),
      },
    });
    const text = await response.text();
    let body = null;
    try { body = text ? JSON.parse(text) : null; } catch (_) { body = { raw: text }; }
    if (!response.ok) {
      const error = new Error(body?.message || `Alpaca paper API returned ${response.status}`);
      error.status = response.status;
      error.body = body;
      throw error;
    }
    return body;
  }
  return {
    getAccount: () => request('/v2/account'),
    getAssets: () => request('/v2/assets?status=active&asset_class=us_equity'),
    getOrders: () => request('/v2/orders?status=all&limit=500&direction=desc'),
    getPositions: () => request('/v2/positions'),
    getOrderByClientId: (clientOrderId) => request(`/v2/orders:by_client_order_id?client_order_id=${encodeURIComponent(clientOrderId)}`),
    submitOrder: (order) => request('/v2/orders', { method: 'POST', body: JSON.stringify(order) }),
  };
}

module.exports = { PAPER_BASE_URL, createAlpacaPaperClient };