import { useLoaderData, useNavigate, useLocation } from "react-router";
import TradingViewChart from "../components/TradingViewChart";
import Navbar from "../components/Navbar";

export const meta = () => [{ title: "Stock Detail - AITrader" }];

interface LoaderData {
  ticker: string;
  position: { qty: number; avg_entry_price: number; current_price: number; market_value: number; unrealized_pl: number } | null;
  orders: any[];
  bars: any[];
  timeframe: string;
  range: string;
}

const TIMEFRAMES = [
  { value: "1D", label: "1 Day" },
  { value: "5Min", label: "5 Min" },
  { value: "15Min", label: "15 Min" },
  { value: "1H", label: "1 Hour" },
  { value: "1W", label: "1 Week" },
];

const RANGES = [
  { value: "1D", label: "1 Day" },
  { value: "1W", label: "1 Week" },
  { value: "1M", label: "1 Month" },
  { value: "3M", label: "3 Months" },
  { value: "1Y", label: "1 Year" },
  { value: "3Y", label: "3 Years" },
  { value: "ALL", label: "All" },
];

export async function loader({ params, request }: { params: { ticker: string }; request: Request }) {
  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";
  
  // Build base URL from request for server-side fetches
  const reqUrl = new URL(request.url);
  const host = request.headers.get("host") || reqUrl.host;
  const protocol = reqUrl.protocol;
  const baseUrl = `${protocol}//${host}`;

  let position = null;
  let orders = [];
  let bars = [];
  
  try {
    // Fetch positions
    const posRes = await fetch(`${baseUrl}/api/alpaca/positions`);
    const positions = posRes.ok ? await posRes.json() : [];
    position = positions.find((p: any) => p.ticker === ticker) ?? null;

    // Fetch orders
    const ordRes = await fetch(`${baseUrl}/api/alpaca/orders`);
    const ordersData = ordRes.ok ? await ordRes.json() : { orders: [] };
    orders = ordersData.orders?.filter((o: any) => o.symbol === ticker) || [];

    // Fetch bars for chart with timeframe and range
    const barsRes = await fetch(`${baseUrl}/api/alpaca/quote/${ticker}?timeframe=${timeframe}&range=${range}`);
    const barsData = barsRes.ok ? await barsRes.json() : null;
    bars = barsData?.bars || [];
  } catch (err) {
    console.error(`analyze/${ticker}: loader error`, err);
  }

  return Response.json({ ticker, position, orders, bars, timeframe, range });
}

export default function StockDetail() {
  const { ticker, position, orders, bars, timeframe, range } = useLoaderData() as LoaderData;
  const navigate = useNavigate();
  const location = useLocation();

  const updateParams = (newTimeframe: string, newRange: string) => {
    const searchParams = new URLSearchParams(location.search);
    searchParams.set("timeframe", newTimeframe);
    searchParams.set("range", newRange);
    navigate(`${location.pathname}?${searchParams.toString()}`, { replace: true });
  };

  // Convert Alpaca bars to TradingView format
  // Keep full timestamp for intraday, use date-only for daily
  // Sort bars by timestamp to ensure ascending order
  const sortedBars = [...(bars || [])].sort((a, b) => {
    const timeA = a.t ? new Date(a.t).getTime() : 0;
    const timeB = b.t ? new Date(b.t).getTime() : 0;
    return timeA - timeB;
  });
  
  const chartData = sortedBars?.map((bar: any) => {
    // Handle timestamp - could be string, number, or Date
    let time: string | number = "";
    if (bar.t) {
      const date = new Date(bar.t);
      if (!isNaN(date.getTime())) {
        // Use Unix timestamp for intraday, date string for daily
        time = ["1Min", "5Min", "15Min", "30Min", "1H"].includes(timeframe) 
          ? Math.floor(date.getTime() / 1000) 
          : date.toISOString().split('T')[0];
      }
    }
    return {
      time,
      open: bar.o,
      high: bar.h,
      low: bar.l,
      close: bar.c,
    };
  })
  // Remove duplicates by time (keep first occurrence) and filter valid bars
  .filter((bar: any, index: number, arr: any[]) => 
    bar.time && bar.open != null && bar.high != null && bar.low != null && bar.close != null &&
    index === arr.findIndex((b: any) => b.time === bar.time)
  ) || [];

  return (
    <div className="min-h-screen bg-gradient-to-br from-gray-50 to-blue-50">
      <Navbar />
      <div className="mx-auto max-w-7xl px-6 py-8">
        <h1 className="text-3xl font-bold text-gray-900 mb-6">{ticker} Detail</h1>
        
        <div className="bg-white rounded-xl shadow-lg p-6 mb-6 border border-gray-200">
          <div className="flex items-center gap-4 mb-4">
            <span className="text-gray-700 font-medium">Timeframe:</span>
            <select
              value={timeframe}
              onChange={(e) => updateParams(e.target.value, range)}
              className="border border-gray-300 rounded-lg px-3 py-1.5 text-gray-900 focus:ring-2 focus:ring-blue-500"
            >
              {TIMEFRAMES.map((tf) => (
                <option key={tf.value} value={tf.value}>{tf.label}</option>
              ))}
            </select>
            
            <span className="text-gray-700 font-medium">Range:</span>
            <select
              value={range}
              onChange={(e) => updateParams(timeframe, e.target.value)}
              className="border border-gray-300 rounded-lg px-3 py-1.5 text-gray-900 focus:ring-2 focus:ring-blue-500"
            >
              {RANGES.map((r) => (
                <option key={r.value} value={r.value}>{r.label}</option>
              ))}
            </select>
          </div>
          
          <TradingViewChart ticker={ticker} data={chartData} />
        </div>
        
        <div className="mt-6 bg-white rounded-xl shadow-lg p-6 border border-gray-200">
          <h2 className="text-xl font-bold text-gray-900 mb-4">Position</h2>
          {position ? (
            <div className="overflow-x-auto">
              <table className="w-full text-sm">
                <tbody>
                  <tr className="border-b border-gray-100">
                    <td className="py-2 px-3 font-medium text-gray-700">Quantity</td>
                    <td className="py-2 px-3 text-gray-900">{position.qty} shares</td>
                  </tr>
                  <tr className="border-b border-gray-100">
                    <td className="py-2 px-3 font-medium text-gray-700">Ticker</td>
                    <td className="py-2 px-3 text-gray-900">{ticker}</td>
                  </tr>
                  <tr className="border-b border-gray-100">
                    <td className="py-2 px-3 font-medium text-gray-700">Current Value</td>
                    <td className="py-2 px-3 text-gray-900">${position.market_value.toFixed(2)}</td>
                  </tr>
                  <tr>
                    <td className="py-2 px-3 font-medium text-gray-700">Earnings</td>
                    <td className={`py-2 px-3 font-bold ${position.unrealized_pl >= 0 ? "text-green-600" : "text-red-600"}`}>
                      ${position.unrealized_pl.toFixed(2)}
                    </td>
                  </tr>
                </tbody>
              </table>
            </div>
          ) : (
            <p className="text-gray-600">No position held</p>
          )}
        </div>
        
        <div className="mt-6 bg-white rounded-xl shadow-lg p-6 border border-gray-200">
          <h2 className="text-xl font-bold text-gray-900 mb-4">Recent Orders</h2>
          {orders.length === 0 ? (
            <p className="text-gray-500">No orders found for {ticker}</p>
          ) : (
            <div className="overflow-x-auto">
              <table className="w-full text-sm">
                <thead>
                  <tr className="border-b border-gray-200">
                    <th className="text-left py-2 px-3 font-medium text-gray-700">Side</th>
                    <th className="text-left py-2 px-3 font-medium text-gray-700">Qty</th>
                    <th className="text-left py-2 px-3 font-medium text-gray-700">Status</th>
                    <th className="text-left py-2 px-3 font-medium text-gray-700">Filled Price</th>
                    <th className="text-left py-2 px-3 font-medium text-gray-700">Filled At</th>
                  </tr>
                </thead>
                <tbody>
                  {orders.map((order: any, i: number) => (
                    <tr key={order.id || i} className="border-b border-gray-100">
                      <td className="py-2 px-3">
                        <span className={order.side === "buy" ? "text-green-600" : "text-red-600"}>
                          {order.side?.toUpperCase()}
                        </span>
                      </td>
                      <td className="py-2 px-3 text-gray-900">{order.qty}</td>
                      <td className="py-2 px-3 text-gray-900">{order.status}</td>
                      <td className="py-2 px-3 text-gray-900">
                        {order.filled_avg_price ? `$${parseFloat(order.filled_avg_price).toFixed(2)}` : "-"}
                      </td>
                      <td className="py-2 px-3 text-gray-600">
                        {order.filled_at ? new Date(order.filled_at).toLocaleDateString() : "-"}
                      </td>
                    </tr>
                  ))}
                </tbody>
              </table>
            </div>
          )}
        </div>
      </div>
    </div>
  );
}