import alpacaService from "../../../lib/alpacaClient";

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 range = url.searchParams.get("range") || "1M"; // 1D, 1W, 1M, 3M, 1Y, 3Y, ALL

  if (!ticker) {
    return Response.json({ error: "Ticker is required" }, { status: 400 });
  }

  try {
    // Normalize timeframe to Alpaca API expected values
    function mapToAlpacaTimeframe(tf: string) {
      switch (tf) {
        case "1H":
          return "1Hour";
        case "1D":
          return "1Day";
        case "1W":
        case "1M":
          return "1Day"; // weekly/monthly UI ranges use daily bars
        default:
          return tf; // 1Min,5Min,15Min,30Min expected to be supported
      }
    }
    const alpacaTimeframe = mapToAlpacaTimeframe(timeframe);

    // Get latest bar for current price (uses paper by default unless mode=live)
    let price = 0;
    try {
      const last = await alpacaService.fetchLatestBar(ticker, alpacaTimeframe);
      price = last ? (last.ClosePrice ?? last.c ?? 0) : 0;
    } catch (tradeErr) {
      console.error(`API quote/${ticker}: fetchLatestBar failed`, tradeErr);
    }
    
    // Calculate start date based on range
    const startDate = new Date();
    const isIntraday = ["1Min", "5Min", "15Min", "30Min", "1H"].includes(timeframe);
    
    if (range === "1D") {
      startDate.setDate(startDate.getDate() - 1);
    } else if (range === "1W") {
      startDate.setDate(startDate.getDate() - 7);
    } else if (range === "1M") {
      startDate.setMonth(startDate.getMonth() - 1);
    } else if (range === "3M") {
      startDate.setMonth(startDate.getMonth() - 3);
    } else if (range === "1Y") {
      startDate.setFullYear(startDate.getFullYear() - 1);
    } else if (range === "3Y") {
      startDate.setFullYear(startDate.getFullYear() - 3);
    } else if (range === "ALL") {
      startDate.setFullYear(startDate.getFullYear() - 10); // Max 10 years
    } else if (isIntraday) {
      startDate.setDate(startDate.getDate() - 30); // Default 30 days for intraday
    }
    
    const barsOptions: any = { limit: 1000 }; // High limit for time range
    // For daily/non-intraday queries pass just the date part (YYYY-MM-DD)
    if (!isIntraday) {
      barsOptions.start = startDate.toISOString().split('T')[0];
    } else {
      // For intraday, pass full ISO start to be precise
      barsOptions.start = startDate.toISOString();
    }
    
    const barsArray = await alpacaService.fetchBars(ticker, alpacaTimeframe, barsOptions);

    // 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 volume = typeof bar.Volume === 'number' ? bar.Volume : (typeof bar.v === 'number' ? bar.v : 0);

      // Normalize timestamp to ISO string so client can parse reliably
      const rawTs = bar.Timestamp ?? bar.t ?? bar.T ?? bar.timestamp;
      let dateObj: Date | null = null;
      if (rawTs != null) {
        if (typeof rawTs === 'number') {
          // If it's likely in seconds (< 1e12) convert to ms
          const asMs = rawTs > 1e12 ? rawTs : rawTs * 1000;
          dateObj = new Date(asMs);
        } else {
          dateObj = new Date(rawTs);
        }
      }
      const iso = dateObj && !isNaN(dateObj.getTime()) ? dateObj.toISOString() : null;

      return {
        t: iso,
        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 && bar.t);

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