import Alpaca from "@alpacahq/alpaca-trade-api";

const alpaca = new Alpaca({
  keyId: process.env.ALPACA_API_KEY!,
  secretKey: process.env.ALPACA_SECRET_KEY!,
  baseUrl: process.env.ALPACA_BASE_URL || "https://paper-api.alpaca.markets",
  dataBaseUrl: process.env.ALPACA_DATA_URL || "https://data.alpaca.markets",
  retryOnError: false,
});

export async function loader({ request, params }: { request: Request; params: { ticker: string } }) {
  const ticker = params.ticker?.toUpperCase();
  const url = new URL(request.url);
  const timeframe = url.searchParams.get("timeframe") || "1D";
  const limit = parseInt(url.searchParams.get("limit") || "30", 10);
  
  console.log(`API quote/${ticker}: loader called with timeframe=${timeframe}, limit=${limit}`);
  if (!ticker) {
    return Response.json({ error: "Ticker is required" }, { status: 400 });
  }

  try {
    // Get latest trade for current price
    let price = 0;
    try {
      const trade = await alpaca.getLatestTrade(ticker);
      price = (trade as { Price?: number }).Price || 0;
      console.log(`API quote/${ticker}: latest trade price = ${price}`);
    } catch (tradeErr) {
      console.error(`API quote/${ticker}: getLatestTrade failed`, tradeErr);
    }
    
    // Calculate start date based on timeframe
    const startDate = new Date();
    const isIntraday = ["1Min", "5Min", "15Min", "30Min", "1H"].includes(timeframe);
    
    if (timeframe === "1D") {
      startDate.setDate(startDate.getDate() - Math.min(limit, 30));
    } else if (timeframe === "1W") {
      startDate.setDate(startDate.getDate() - (limit * 7));
    } else if (timeframe === "1M") {
      startDate.setMonth(startDate.getMonth() - limit);
    } else if (isIntraday) {
      startDate.setDate(startDate.getDate() - Math.floor(limit / 5));
    }
    
    const barsOptions: any = { timeframe, limit };
    if (timeframe !== "1Min" && timeframe !== "5Min") {
      barsOptions.start = startDate.toISOString().split('T')[0];
    }
    
    console.log(`API quote/${ticker}: calling getBarsV2 with timeframe=${timeframe}, limit=${limit}`);
    const bars = await alpaca.getBarsV2(ticker, barsOptions);
    console.log(`API quote/${ticker}: getBarsV2 returned`, typeof bars, bars?.constructor?.name);
    
    // Convert async generator to array
    // Alpaca v2 API returns AlpacaBar with capitalized property names
    const barsArray = [];
    try {
      for await (const bar of bars) {
        console.log(`API quote/${ticker}: received bar =`, JSON.stringify(bar));
        barsArray.push(bar);
      }
    } catch (genErr) {
      console.error(`API quote/${ticker}: error iterating bars`, genErr);
    }
    
    console.log(`API quote/${ticker}: raw bars count = ${barsArray.length}`);
    if (barsArray.length > 0) {
      console.log(`API quote/${ticker}: first bar =`, JSON.stringify(barsArray[0]));
    } else {
      console.log(`API quote/${ticker}: no bars returned from Alpaca, generator may be empty`);
    }

    // Transform to chart format
    const transformedBars = barsArray.map((bar: any) => {
      // AlpacaBarV2 transforms lowercase to capitalized: o->OpenPrice, h->HighPrice, etc.
      const open = typeof bar.OpenPrice === 'number' ? bar.OpenPrice : (typeof bar.o === 'number' ? bar.o : 0);
      const high = typeof bar.HighPrice === 'number' ? bar.HighPrice : (typeof bar.h === 'number' ? bar.h : 0);
      const low = typeof bar.LowPrice === 'number' ? bar.LowPrice : (typeof bar.l === 'number' ? bar.l : 0);
      const close = typeof bar.ClosePrice === 'number' ? bar.ClosePrice : (typeof bar.c === 'number' ? bar.c : 0);
      const timestamp = bar.Timestamp ?? bar.t;
      const volume = typeof bar.Volume === 'number' ? bar.Volume : (typeof bar.v === 'number' ? bar.v : 0);
      
      return {
        t: timestamp,
        o: open,
        h: high,
        l: low,
        c: close,
        v: volume,
      };
    }).filter((bar: any) => bar.o > 0 && bar.h > 0 && bar.l > 0 && bar.c > 0);
    
    console.log(`API quote/${ticker}: returning ${transformedBars.length} bars`);

    return Response.json({
      ticker,
      price,
      bars: transformedBars,
    });
  } catch (error) {
    console.error("Alpaca data error:", error);
    return Response.json({ ticker, price: 0, bars: [] }, { status: 500 });
  }
}