import { createFileRoute } from "@tanstack/react-router";
import { useState, useEffect } from "react";
import { sharesApi } from "@/lib/api-client";
import { fetchStockQuotes, fetchStockQuote, getStockBoard, type StockQuote } from "@/lib/stock-api";
import { Card, CardContent, CardHeader, CardTitle } from "@/components/ui/card";
import { Button } from "@/components/ui/button";
import { TrendingUp, TrendingDown, Calendar, Share2 } from "lucide-react";
import { Link } from "@tanstack/react-router";
import { toast } from "sonner";

export const Route = createFileRoute("/share/$code")({
  component: SharePage,
});

interface CollectionInfo {
  id: number;
  name: string;
  description: string | null;
}

interface StockRecord {
  id: number;
  stock_code: string;
  stock_name: string;
  added_at: string;
  added_price: number | null;
}

function SharePage() {
  const { code } = Route.useParams();
  const [collection, setCollection] = useState<CollectionInfo | null>(null);
  const [stocks, setStocks] = useState<(StockRecord & { quote?: StockQuote })[]>([]);
  const [loading, setLoading] = useState(true);
  const [error, setError] = useState<string | null>(null);

  useEffect(() => {
    loadSharedData();
  }, [code]);

  const loadSharedData = async () => {
    setLoading(true);
    setError(null);
    try {
      // sharesApi.get 返回集合信息（含股票列表）
      const data = await sharesApi.get(code);

      if (!data) {
        setError("分享链接无效");
        setLoading(false);
        return;
      }

      setCollection({
        id: data.id,
        name: data.name,
        description: data.description,
      });

      const stocksData = data.stocks || [];

      const stockRecords: StockRecord[] = stocksData || [];

      // 批量获取实时行情
      if (stockRecords.length > 0) {
        const codes = stockRecords.map((s) => s.stock_code);
        const quoteMap = await fetchStockQuotesFromCodes(codes);

        const merged = stockRecords.map((record) => ({
          ...record,
          quote: quoteMap.get(record.stock_code),
        }));
        setStocks(merged);
      } else {
        setStocks([]);
      }
    } catch (err) {
      console.error("加载失败:", err);
      const msg = err instanceof Error ? err.message : "加载数据失败";
      setError(msg);
    } finally {
      setLoading(false);
    }
  };

  const fetchStockQuotesFromCodes = async (codes: string[]): Promise<Map<string, StockQuote>> => {
    const map = new Map<string, StockQuote>();
    await Promise.all(
      codes.map(async (code) => {
        try {
          const quote = await fetchStockQuote(code);
          if (quote) map.set(code, quote);
        } catch {
          // 忽略单个股票获取失败
        }
      })
    );
    return map;
  };

  const copyShareLink = async () => {
    const link = window.location.href;
    try {
      await navigator.clipboard.writeText(link);
      toast.success("链接已复制到剪贴板");
    } catch (err) {
      toast.error("复制失败");
    }
  };

  if (loading) {
    return (
      <div className="min-h-screen flex items-center justify-center">
        <p className="text-muted-foreground">加载中...</p>
      </div>
    );
  }

  if (error) {
    return (
      <div className="min-h-screen flex items-center justify-center">
        <div className="text-center">
          <p className="text-xl font-semibold mb-2">加载失败</p>
          <p className="text-muted-foreground">{error}</p>
        </div>
      </div>
    );
  }

  if (!collection) {
    return (
      <div className="min-h-screen flex items-center justify-center">
        <div className="text-center">
          <p className="text-xl font-semibold mb-2">分享链接无效</p>
          <p className="text-muted-foreground">该链接可能已过期或不存在</p>
        </div>
      </div>
    );
  }

  return (
    <div className="min-h-screen bg-gradient-to-br from-background via-muted/30 to-background">
      <div className="container mx-auto px-4 py-8 max-w-6xl">
        {/* Header */}
        <Card className="mb-6 shadow-lg">
          <CardContent className="p-6">
            <div className="flex items-center justify-between">
              <div>
                <h1 className="text-3xl font-bold mb-2">{collection.name}</h1>
                {collection.description && (
                  <p className="text-muted-foreground">{collection.description}</p>
                )}
              </div>
              <Button onClick={copyShareLink} variant="outline">
                <Share2 className="mr-2 h-4 w-4" />
                分享
              </Button>
            </div>
          </CardContent>
        </Card>

        {/* Stocks List */}
        {stocks.length === 0 ? (
          <Card>
            <CardContent className="p-12 text-center text-muted-foreground">
              <p>该集合暂无股票</p>
            </CardContent>
          </Card>
        ) : (
          <div className="grid grid-cols-1 md:grid-cols-2 lg:grid-cols-3 gap-6">
            {stocks.map((stock) => {
              const quote = stock.quote;
              const currentPrice = quote?.currentPrice;
              const addedPrice = stock.added_price;
              
              let changePercent = 0;
              let hasChange = false;
              let isPositive = true;

              if (currentPrice && addedPrice && addedPrice > 0) {
                changePercent = ((currentPrice - addedPrice) / addedPrice) * 100;
                hasChange = true;
                isPositive = changePercent >= 0;
              }

              return (
                <Link
                  key={stock.id}
                  to="/stock/$code"
                  params={{ code: stock.stock_code }}
                  search={{ from: `share/${code}` }}
                  className="block"
                >
                  <Card className="hover:shadow-lg transition-shadow cursor-pointer h-full">
                    <CardHeader>
                      <CardTitle className="flex items-center justify-between">
                        <div className="flex items-center gap-2 min-w-0">
                          <span className="truncate">{stock.stock_name}</span>
                          {(() => {
                            const board = getStockBoard(stock.stock_code);
                            if (!board.label) return null;
                            return (
                              <span className={`inline-flex items-center justify-center w-4 h-4 rounded-sm text-[9px] font-bold leading-none shrink-0 ${board.className}`}>
                                {board.label}
                              </span>
                            );
                          })()}
                        </div>
                        <span className="text-sm font-normal text-muted-foreground shrink-0 ml-2">
                          {stock.stock_code}
                        </span>
                      </CardTitle>
                    </CardHeader>
                    <CardContent>
                      <div className="space-y-3">
                        {/* Current Price */}
                        <div>
                          <p className="text-2xl font-bold">
                            {currentPrice ? `¥${currentPrice.toFixed(2)}` : "—"}
                          </p>
                        </div>

                        {/* Added Info and Change */}
                        <div className="pt-2 border-t space-y-2">
                          <div className="flex items-center gap-2 text-sm text-muted-foreground">
                            <Calendar className="h-4 w-4" />
                            <span>
                              添加于 {new Date(stock.added_at).toLocaleDateString("zh-CN")}
                            </span>
                          </div>
                          
                          {addedPrice && (
                            <p className="text-sm text-muted-foreground">
                              添加价: ¥{addedPrice.toFixed(2)}
                            </p>
                          )}

                          {hasChange && (
                            <div className={`flex items-center gap-1 ${isPositive ? "text-red-500" : "text-green-500"}`}>
                              {isPositive ? (
                                <TrendingUp className="h-4 w-4" />
                              ) : (
                                <TrendingDown className="h-4 w-4" />
                              )}
                              <span className="font-semibold">
                                {isPositive ? "+" : ""}{changePercent.toFixed(2)}%
                              </span>
                            </div>
                          )}
                        </div>
                      </div>
                    </CardContent>
                  </Card>
                </Link>
              );
            })}
          </div>
        )}
      </div>
    </div>
  );
}