const BASE = process.env.ALPACA_BASE_URL || "https://paper-api.alpaca.markets";

function headers(): HeadersInit {
  const key = process.env.ALPACA_API_KEY || "";
  const sec = process.env.ALPACA_API_SECRET || "";
  return {
    "APCA-API-KEY-ID": key,
    "APCA-API-SECRET-KEY": sec,
    Accept: "application/json",
  };
}

export function credentialsPresent(): boolean {
  return Boolean(process.env.ALPACA_API_KEY && process.env.ALPACA_API_SECRET);
}

async function alpacaGet<T>(pathname: string): Promise<T | null> {
  if (!credentialsPresent()) return null;
  try {
    const res = await fetch(`${BASE}${pathname}`, {
      headers: headers(),
      cache: "no-store",
    });
    if (!res.ok) return null;
    return (await res.json()) as T;
  } catch {
    return null;
  }
}

export type Account = {
  equity: string;
  cash: string;
  buying_power: string;
  portfolio_value: string;
  status: string;
  pattern_day_trader?: boolean;
  last_equity?: string;
};

export type Position = {
  symbol: string;
  qty: string;
  avg_entry_price: string;
  current_price: string;
  market_value: string;
  unrealized_pl: string;
  unrealized_plpc: string;
  side: string;
  asset_class: string;
};

export type Order = {
  id: string;
  symbol: string;
  side: string;
  qty: string | null;
  filled_qty: string | null;
  order_type: string;
  status: string;
  submitted_at: string;
  filled_at: string | null;
  filled_avg_price: string | null;
  trail_percent?: string | null;
  limit_price?: string | null;
  stop_price?: string | null;
  asset_class?: string;
};

export type Clock = { is_open: boolean; next_open: string; next_close: string };

export const getAccount = () => alpacaGet<Account>("/v2/account");
export const getPositions = () => alpacaGet<Position[]>("/v2/positions");
export const getOrders = () => alpacaGet<Order[]>("/v2/orders?status=all&limit=50&nested=true");
export const getClock = () => alpacaGet<Clock>("/v2/clock");