import { useState } from "react";
import { useQuery, useMutation } from "@tanstack/react-query";
import { useRoute, useLocation } from "wouter";
import { Button } from "@/components/ui/button";
import { Card, CardContent, CardHeader, CardTitle } from "@/components/ui/card";
import { Badge } from "@/components/ui/badge";
import { Input } from "@/components/ui/input";
import { TrendingUp, TrendingDown, DollarSign, Clock } from "lucide-react";
import { useToast } from "@/hooks/use-toast";
import { apiRequest, queryClient } from "@/lib/queryClient";
import Footer from "@/components/Footer";
import type { Article, PredictionMarket } from "@shared/schema";

export default function Article() {
  const [, params] = useRoute("/articles/:slug");
  const [, setLocation] = useLocation();
  const { toast } = useToast();
  const [betAmounts, setBetAmounts] = useState<Record<string, string>>({});

  const { data: article, isLoading: articleLoading } = useQuery<Article>({
    queryKey: ["/api/articles", params?.slug],
    enabled: !!params?.slug
  });

  const { data: markets = [], isLoading: marketsLoading } = useQuery<PredictionMarket[]>({
    queryKey: ["/api/articles", params?.slug, "markets"],
    enabled: !!params?.slug
  });

  const placeBetMutation = useMutation({
    mutationFn: async ({ marketId, side, amount }: { marketId: string; side: "yes" | "no"; amount: number }) => {
      return apiRequest(`/api/prediction-markets/${marketId}/bets`, {
        method: "POST",
        body: { side, amount }
      });
    },
    onSuccess: () => {
      toast({
        title: "베팅 성공",
        description: "예측시장 베팅이 성공적으로 완료되었습니다."
      });
      queryClient.invalidateQueries({ queryKey: ["/api/articles", params?.slug, "markets"] });
      setBetAmounts({});
    },
    onError: (error: any) => {
      toast({
        title: "베팅 실패",
        description: error.message || "베팅 처리 중 오류가 발생했습니다.",
        variant: "destructive"
      });
    }
  });

  const formatCurrency = (amount: string | number) => {
    return new Intl.NumberFormat('ko-KR', {
      style: 'currency',
      currency: 'KRW'
    }).format(Number(amount));
  };

  const formatPercentage = (value: number) => {
    return `${(value * 100).toFixed(1)}%`;
  };

  const formatDate = (dateString: string) => {
    return new Intl.DateTimeFormat('ko-KR', {
      year: 'numeric',
      month: 'long',
      day: 'numeric',
      hour: '2-digit',
      minute: '2-digit'
    }).format(new Date(dateString));
  };

  const handleBetAmountChange = (marketId: string, value: string) => {
    setBetAmounts(prev => ({
      ...prev,
      [marketId]: value
    }));
  };

  const handlePlaceBet = (marketId: string, side: "yes" | "no") => {
    const amount = parseFloat(betAmounts[marketId] || "0");
    if (amount <= 0) {
      toast({
        title: "잘못된 금액",
        description: "베팅 금액을 올바르게 입력해주세요.",
        variant: "destructive"
      });
      return;
    }

    placeBetMutation.mutate({ marketId, side, amount });
  };

  const parseArticleContent = (content: string) => {
    const sectionRegex = /##SECTION##(.+?)##/g;
    const parts: { type: 'section' | 'text'; content: string }[] = [];
    let lastIndex = 0;
    let match;

    while ((match = sectionRegex.exec(content)) !== null) {
      if (match.index > lastIndex) {
        parts.push({ type: 'text', content: content.slice(lastIndex, match.index) });
      }
      parts.push({ type: 'section', content: match[1] });
      lastIndex = match.index + match[0].length;
    }

    if (lastIndex < content.length) {
      parts.push({ type: 'text', content: content.slice(lastIndex) });
    }

    return parts;
  };

  if (articleLoading) {
    return (
      <div className="min-h-screen bg-gray-50">
        <header className="bg-white border-b border-gray-200 sticky top-0 z-50">
          <div className="max-w-7xl mx-auto px-6 py-4">
            <div className="flex items-center justify-between">
              <div className="flex items-center">
                <img 
                  src="/attached_assets/logo_black_1759181850935.png" 
                  alt="SAPIENS" 
                  className="h-5 w-auto cursor-pointer"
                  data-testid="logo-sapiens"
                  onClick={() => setLocation("/")}
                />
              </div>
            </div>
          </div>
        </header>

        <main className="max-w-7xl mx-auto px-6 py-8">
          <div className="animate-pulse">
            <div className="h-8 bg-gray-300 rounded mb-4 w-3/4"></div>
            <div className="h-4 bg-gray-300 rounded mb-6 w-1/2"></div>
            <div className="h-64 bg-gray-300 rounded mb-6"></div>
            <div className="space-y-2">
              <div className="h-4 bg-gray-300 rounded"></div>
              <div className="h-4 bg-gray-300 rounded"></div>
              <div className="h-4 bg-gray-300 rounded w-3/4"></div>
            </div>
          </div>
        </main>
      </div>
    );
  }

  if (!article) {
    return (
      <div className="min-h-screen bg-gray-50 flex items-center justify-center">
        <div className="text-center">
          <h1 className="text-2xl font-bold mb-4">기사를 찾을 수 없습니다</h1>
          <Button onClick={() => setLocation("/")}>홈으로 돌아가기</Button>
        </div>
      </div>
    );
  }

  return (
    <div className="min-h-screen bg-gray-50">
      {/* Header */}
      <header className="bg-white border-b border-gray-200 sticky top-0 z-50">
        <div className="max-w-7xl mx-auto px-6 py-4">
          <div className="flex items-center justify-between">
            <div className="flex items-center">
              <img 
                src="/attached_assets/logo_black_1759181850935.png" 
                alt="SAPIENS" 
                className="h-5 w-auto cursor-pointer"
                data-testid="logo-sapiens"
                onClick={() => setLocation("/")}
              />
            </div>
          </div>
        </div>
      </header>

      <main className="max-w-7xl mx-auto px-6 py-12">
        {/* Article Content */}
        <article className="mb-16 max-w-4xl mx-auto">
          <header className="mb-10">
            <h1 className="text-4xl font-bold mb-6 text-gray-900 leading-tight" data-testid="text-article-title">{article.title}</h1>
            {article.excerpt && (
              <p className="text-lg text-gray-600 mb-0 leading-relaxed" data-testid="text-article-excerpt">
                {article.excerpt}
              </p>
            )}
          </header>

          <div 
            className="text-base text-gray-800"
            data-testid="text-article-content"
          >
            {parseArticleContent(article.content).map((part, index) => {
              if (part.type === 'section') {
                return (
                  <h3 
                    key={index} 
                    className="text-lg font-bold mt-8 mb-3 text-gray-900"
                  >
                    {part.content.trim()}
                  </h3>
                );
              }
              return (
                <p key={index} className="mb-3 whitespace-pre-wrap leading-loose">
                  {part.content.trim()}
                </p>
              );
            })}
          </div>
        </article>

        {/* Prediction Markets Section */}
        <section>
          <div className="flex items-center space-x-3 mb-6">
            <TrendingUp className="h-6 w-6 text-primary" />
            <h2 className="text-2xl font-bold">관련 예측시장</h2>
          </div>

          {marketsLoading ? (
            <div className="space-y-4">
              {Array.from({ length: 3 }).map((_, i) => (
                <Card key={i} className="animate-pulse">
                  <CardContent className="p-6">
                    <div className="h-6 bg-gray-300 rounded mb-4 w-3/4"></div>
                    <div className="grid grid-cols-2 gap-4">
                      <div className="h-20 bg-gray-300 rounded"></div>
                      <div className="h-20 bg-gray-300 rounded"></div>
                    </div>
                  </CardContent>
                </Card>
              ))}
            </div>
          ) : markets.length > 0 ? (
            <div className="space-y-6">
              {markets.map((market) => (
                <Card key={market.id} className="border-primary/20">
                  <CardHeader>
                    <CardTitle className="flex items-center justify-between">
                      <span data-testid={`text-market-question-${market.id}`}>{market.question}</span>
                      <Badge variant="outline" className="flex items-center space-x-1">
                        <Clock className="h-3 w-3" />
                        <span>{formatDate(market.resolutionDate)}</span>
                      </Badge>
                    </CardTitle>
                  </CardHeader>
                  
                  <CardContent className="p-6">
                    <div className="grid grid-cols-1 md:grid-cols-2 gap-6">
                      {/* Yes Option */}
                      <div className="border rounded-lg p-4 bg-green-50 border-green-200">
                        <div className="flex items-center justify-between mb-3">
                          <div className="flex items-center space-x-2">
                            <TrendingUp className="h-5 w-5 text-green-600" />
                            <span className="font-semibold text-green-900">YES</span>
                          </div>
                          <div className="text-right">
                            <div className="text-sm text-green-700">현재 가격</div>
                            <div className="font-bold text-green-900" data-testid={`text-yes-price-${market.id}`}>
                              {formatPercentage(market.yesPrice)}
                            </div>
                          </div>
                        </div>
                        
                        <div className="space-y-3">
                          <Input
                            type="number"
                            placeholder="베팅 금액 (원)"
                            value={betAmounts[market.id] || ""}
                            onChange={(e) => handleBetAmountChange(market.id, e.target.value)}
                            className="border-green-300 focus:border-green-500"
                            data-testid={`input-bet-amount-${market.id}`}
                          />
                          <Button 
                            onClick={() => handlePlaceBet(market.id, "yes")}
                            disabled={placeBetMutation.isPending}
                            className="w-full bg-green-600 hover:bg-green-700"
                            data-testid={`button-bet-yes-${market.id}`}
                          >
                            <DollarSign className="h-4 w-4 mr-2" />
                            YES 베팅
                          </Button>
                        </div>
                      </div>

                      {/* No Option */}
                      <div className="border rounded-lg p-4 bg-red-50 border-red-200">
                        <div className="flex items-center justify-between mb-3">
                          <div className="flex items-center space-x-2">
                            <TrendingDown className="h-5 w-5 text-red-600" />
                            <span className="font-semibold text-red-900">NO</span>
                          </div>
                          <div className="text-right">
                            <div className="text-sm text-red-700">현재 가격</div>
                            <div className="font-bold text-red-900" data-testid={`text-no-price-${market.id}`}>
                              {formatPercentage(market.noPrice)}
                            </div>
                          </div>
                        </div>
                        
                        <div className="space-y-3">
                          <Input
                            type="number"
                            placeholder="베팅 금액 (원)"
                            value={betAmounts[market.id] || ""}
                            onChange={(e) => handleBetAmountChange(market.id, e.target.value)}
                            className="border-red-300 focus:border-red-500"
                            data-testid={`input-bet-amount-no-${market.id}`}
                          />
                          <Button 
                            onClick={() => handlePlaceBet(market.id, "no")}
                            disabled={placeBetMutation.isPending}
                            className="w-full bg-red-600 hover:bg-red-700"
                            data-testid={`button-bet-no-${market.id}`}
                          >
                            <DollarSign className="h-4 w-4 mr-2" />
                            NO 베팅
                          </Button>
                        </div>
                      </div>
                    </div>

                    {/* Market Stats */}
                    <div className="mt-4 pt-4 border-t border-gray-200">
                      <div className="grid grid-cols-3 gap-4 text-center text-sm text-muted-foreground">
                        <div>
                          <div className="font-semibold" data-testid={`text-total-volume-${market.id}`}>
                            {formatCurrency(market.totalVolume)}
                          </div>
                          <div>총 거래량</div>
                        </div>
                        <div>
                          <div className="font-semibold" data-testid={`text-total-bets-${market.id}`}>
                            {market.totalBets}
                          </div>
                          <div>총 베팅 수</div>
                        </div>
                        <div>
                          <div className="font-semibold">
                            {formatDate(market.resolutionDate)}
                          </div>
                          <div>결과 발표일</div>
                        </div>
                      </div>
                    </div>
                  </CardContent>
                </Card>
              ))}
            </div>
          ) : (
            <Card>
              <CardContent className="p-8 text-center text-muted-foreground">
                <TrendingUp className="h-12 w-12 mx-auto mb-4 opacity-50" />
                <h3 className="text-lg font-semibold mb-2">관련 예측시장이 없습니다</h3>
                <p>이 기사와 관련된 예측시장이 아직 생성되지 않았습니다.</p>
              </CardContent>
            </Card>
          )}
        </section>
      </main>

      {/* Footer */}
      <Footer />
    </div>
  );
}