#!/usr/bin/env node
/**
 * Stock price monitor - checks for big moves and news
 * Usage: node stock-monitor.js [--alert]
 * 
 * Watchlist defined below. Alerts on >5% moves.
 */

const https = require('https');

// Watchlist with context
const WATCHLIST = [
  { symbol: 'NABL', name: 'N-able', note: 'PE takeover watch' },
  { symbol: 'S', name: 'SentinelOne', note: 'Johan short position' },
  { symbol: 'MSFT', name: 'Microsoft', note: 'Big tech' },
  { symbol: 'NVDA', name: 'NVIDIA', note: 'Big tech' },
  { symbol: 'TSLA', name: 'Tesla', note: 'Volatile' },
];

const ALERT_THRESHOLD = 5.0; // percent

function fetchQuote(symbol) {
  return new Promise((resolve, reject) => {
    const url = `https://query1.finance.yahoo.com/v8/finance/chart/${symbol}?interval=1d&range=2d`;
    
    https.get(url, { headers: { 'User-Agent': 'Mozilla/5.0' } }, (res) => {
      let data = '';
      res.on('data', chunk => data += chunk);
      res.on('end', () => {
        try {
          const json = JSON.parse(data);
          const result = json.chart?.result?.[0];
          if (!result) {
            resolve({ symbol, error: 'No data' });
            return;
          }
          
          const meta = result.meta;
          const price = meta.regularMarketPrice;
          const prevClose = meta.chartPreviousClose || meta.previousClose;
          const change = price - prevClose;
          const pctChange = (change / prevClose) * 100;
          
          resolve({
            symbol,
            price: price.toFixed(2),
            prevClose: prevClose.toFixed(2),
            change: change.toFixed(2),
            pctChange: pctChange.toFixed(2),
            isAlert: Math.abs(pctChange) >= ALERT_THRESHOLD
          });
        } catch (e) {
          resolve({ symbol, error: e.message });
        }
      });
    }).on('error', e => resolve({ symbol, error: e.message }));
  });
}

async function main() {
  const alertOnly = process.argv.includes('--alert');
  const results = await Promise.all(WATCHLIST.map(w => fetchQuote(w.symbol)));
  
  const alerts = [];
  
  console.log('📈 Stock Monitor\n');
  console.log('Symbol   Price     Change    %Chg     Note');
  console.log('------   -----     ------    ----     ----');
  
  for (const r of results) {
    const info = WATCHLIST.find(w => w.symbol === r.symbol);
    
    if (r.error) {
      console.log(`${r.symbol.padEnd(8)} ERROR: ${r.error}`);
      continue;
    }
    
    const direction = parseFloat(r.change) >= 0 ? '+' : '';
    const flag = r.isAlert ? '⚠️ ' : '  ';
    
    console.log(
      `${flag}${r.symbol.padEnd(6)} $${r.price.padStart(7)}  ${direction}${r.change.padStart(7)}  ${direction}${r.pctChange.padStart(5)}%   ${info?.note || ''}`
    );
    
    if (r.isAlert) {
      alerts.push({ ...r, note: info?.note });
    }
  }
  
  if (alerts.length > 0) {
    console.log('\n🚨 ALERTS (>5% move):');
    for (const a of alerts) {
      const direction = parseFloat(a.pctChange) >= 0 ? '📈' : '📉';
      console.log(`  ${direction} ${a.symbol}: ${a.pctChange}% (${a.note})`);
    }
  }
  
  // Return alerts for piping to other tools
  if (alertOnly && alerts.length === 0) {
    process.exit(0);
  }
  
  return alerts;
}

main().catch(console.error);