learning_ai_invt_trdg/web/src/lib/marketApi.ts

/**
 * Authenticated fetch helpers for the new market-data proxy endpoints.
 * Follows the same pattern as profileApi.ts.
 */
import { getPlatformAccessToken } from './authSession';
import { tradingRuntime } from './runtime';
import { createRequestId } from '../../../shared/request-id.js';

async function apiGet<T>(path: string): Promise<T> {
  const token = await getPlatformAccessToken();
  const res = await fetch(`${tradingRuntime.tradingApiUrl}${path}`, {
    headers: {
      Authorization:   `Bearer ${token}`,
      'x-request-id':  createRequestId('web-market'),
    },
  });
  if (!res.ok) {
    const body = await res.json().catch(() => ({})) as any;
    throw new Error(body?.error ?? `Request failed (${res.status})`);
  }
  return res.json() as Promise<T>;
}

// ── Chart bars ────────────────────────────────────────────────────────────────

export interface OHLCVBar {
  ts:     number;
  open:   number;
  high:   number;
  low:    number;
  close:  number;
  volume: number;
}

export async function fetchChartBars(
  symbol: string,
  period: string,
): Promise<OHLCVBar[]> {
  const data = await apiGet<{ bars: OHLCVBar[] }>(
    `/api/chart/bars?symbol=${encodeURIComponent(symbol)}&period=${encodeURIComponent(period)}`,
  );
  return data.bars ?? [];
}

// ── Market indices ────────────────────────────────────────────────────────────

export interface IndexSnapshot {
  label:    string;    // 'S&P 500' | 'Dow Jones' | 'Nasdaq'
  symbol:   string;    // SPY | DIA | QQQ
  price:    number;
  change:   number;
  changePct:number;
  positive: boolean;
}

const INDEX_META: Record<string, { label: string; symbol: string }> = {
  SPY: { label: 'S&P 500',  symbol: 'SPY' },
  DIA: { label: 'Dow Jones', symbol: 'DIA' },
  QQQ: { label: 'Nasdaq',   symbol: 'QQQ' },
};

export async function fetchMarketIndices(): Promise<IndexSnapshot[]> {
  // Backend returns Alpaca snapshot shape: { SPY: { latestTrade, dailyBar, prevDailyBar, ... }, ... }
  const data = await apiGet<Record<string, any>>('/api/market/indices');
  return Object.entries(INDEX_META).map(([ticker, meta]) => {
    const snap = data[ticker];
    const price      = snap?.latestTrade?.p  ?? snap?.latestQuote?.ap ?? 0;
    const prevClose  = snap?.prevDailyBar?.c ?? 0;
    const change     = prevClose > 0 ? price - prevClose : 0;
    const changePct  = prevClose > 0 ? (change / prevClose) * 100  : 0;
    return {
      ...meta,
      price,
      change,
      changePct,
      positive: changePct >= 0,
    };
  });
}

// ── News ──────────────────────────────────────────────────────────────────────

export interface NewsArticle {
  id?:        string;
  url:        string;
  headline:   string;
  source:     string;
  created_at: string;
  images?:    Array<{ url: string; size?: string }>;
}

export async function fetchNews(symbol: string, limit = 8): Promise<NewsArticle[]> {
  const data = await apiGet<{ news: NewsArticle[] }>(
    `/api/news?symbols=${encodeURIComponent(symbol)}&limit=${limit}`,
  );
  return data.news ?? [];
}

// ── Research ──────────────────────────────────────────────────────────────────

export async function fetchResearchProfile(symbol: string): Promise<any> {
  return apiGet(`/api/research/profile?symbol=${encodeURIComponent(symbol)}`);
}

export async function fetchResearchMetrics(symbol: string): Promise<any> {
  return apiGet(`/api/research/metrics?symbol=${encodeURIComponent(symbol)}`);
}

export async function fetchResearchEarnings(symbol: string): Promise<any[]> {
  const data = await apiGet<{ earnings: any[] }>(
    `/api/research/earnings?symbol=${encodeURIComponent(symbol)}`,
  );
  return data.earnings ?? [];
}