"use client";

import {
  Clock,
  Eye,
  Heart,
  MessageSquare,
  MousePointerClick,
  TrendingUp,
} from "lucide-react";
import { useEffect, useState } from "react";
import { Card, CardContent, CardHeader, CardTitle } from "@/components/ui/card";
import { Skeleton } from "@/components/ui/skeleton";
import { useSession } from "@/lib/hooks/use-session";

interface AdAnalytics {
  ad_id: number;
  impressions: number;
  clicks: number;
  ctr: number;
  avg_view_duration: number;
  bounce_rate: number;
  inquiries: number;
  favorites: number;
  conversion_rate: number;
  time_to_sell: number | null;
  last_updated: Date;
}

interface Listing {
  listing_id: number;
  item_name: string;
  listing_status: string;
}

export function AnalyticsDashboard() {
  const { user } = useSession();
  const [listings, setListings] = useState<Listing[]>([]);
  const [selectedAd, setSelectedAd] = useState<number | null>(null);
  const [analytics, setAnalytics] = useState<AdAnalytics | null>(null);
  const [loading, setLoading] = useState(true);

  useEffect(() => {
    if (user?.userId) {
      loadUserListings();
    }
  }, [user?.userId, loadUserListings]);

  useEffect(() => {
    if (selectedAd) {
      loadAnalytics(selectedAd);
    }
  }, [selectedAd, loadAnalytics]);

  const loadUserListings = async () => {
    setLoading(true);
    try {
      const res = await fetch("/api/listings/my");
      if (res.ok) {
        const data = await res.json();
        setListings(data.listings || []);
        if (data.listings && data.listings.length > 0) {
          setSelectedAd(data.listings[0].listing_id);
        }
      }
    } catch (error) {
      console.error("Erro ao carregar anúncios:", error);
    } finally {
      setLoading(false);
    }
  };

  const loadAnalytics = async (adId: number) => {
    try {
      const res = await fetch(`/api/telemetry/analytics?adId=${adId}`);
      if (res.ok) {
        const data = await res.json();
        setAnalytics(data.analytics);
      }
    } catch (error) {
      console.error("Erro ao carregar analytics:", error);
    }
  };

  if (!user) {
    return (
      <div className="text-center py-12">
        <p className="text-muted-foreground">
          Faça login para ver suas analytics
        </p>
      </div>
    );
  }

  if (loading) {
    return (
      <div className="space-y-6">
        <Skeleton className="h-8 w-64" />
        <div className="grid grid-cols-1 md:grid-cols-3 gap-6">
          {Array.from({ length: 6 }).map((_, i) => (
            <Skeleton key={i} className="h-32" />
          ))}
        </div>
      </div>
    );
  }

  if (listings.length === 0) {
    return (
      <div className="text-center py-12">
        <p className="text-muted-foreground">
          Você ainda não tem anúncios. Crie um anúncio para ver as analytics.
        </p>
      </div>
    );
  }

  return (
    <div className="space-y-6">
      <div>
        <h1 className="text-3xl font-bold">Analytics dos Anúncios</h1>
        <p className="text-muted-foreground mt-1">
          Acompanhe o desempenho dos seus anúncios
        </p>
      </div>

      {/* Seletor de anúncio */}
      <div className="space-y-2">
        <label className="text-sm font-medium">Selecione um anúncio</label>
        <select
          className="w-full p-2 border rounded-md"
          value={selectedAd || ""}
          onChange={(e) => setSelectedAd(parseInt(e.target.value, 10))}
        >
          {listings.map((listing) => (
            <option key={listing.listing_id} value={listing.listing_id}>
              {listing.item_name} ({listing.listing_status})
            </option>
          ))}
        </select>
      </div>

      {/* Métricas */}
      {analytics && (
        <div className="grid grid-cols-1 md:grid-cols-2 lg:grid-cols-3 gap-6">
          <Card>
            <CardHeader>
              <CardTitle className="flex items-center gap-2">
                <Eye className="h-5 w-5" />
                Impressões
              </CardTitle>
            </CardHeader>
            <CardContent>
              <div className="text-3xl font-bold">{analytics.impressions}</div>
              <p className="text-sm text-muted-foreground mt-1">
                Visualizações do anúncio
              </p>
            </CardContent>
          </Card>

          <Card>
            <CardHeader>
              <CardTitle className="flex items-center gap-2">
                <MousePointerClick className="h-5 w-5" />
                Cliques
              </CardTitle>
            </CardHeader>
            <CardContent>
              <div className="text-3xl font-bold">{analytics.clicks}</div>
              <p className="text-sm text-muted-foreground mt-1">
                CTR: {analytics.ctr.toFixed(2)}%
              </p>
            </CardContent>
          </Card>

          <Card>
            <CardHeader>
              <CardTitle className="flex items-center gap-2">
                <Clock className="h-5 w-5" />
                Duração Média
              </CardTitle>
            </CardHeader>
            <CardContent>
              <div className="text-3xl font-bold">
                {analytics.avg_view_duration.toFixed(1)}s
              </div>
              <p className="text-sm text-muted-foreground mt-1">
                Tempo médio de visualização
              </p>
            </CardContent>
          </Card>

          <Card>
            <CardHeader>
              <CardTitle className="flex items-center gap-2">
                <TrendingUp className="h-5 w-5" />
                Bounce Rate
              </CardTitle>
            </CardHeader>
            <CardContent>
              <div className="text-3xl font-bold">
                {analytics.bounce_rate.toFixed(1)}%
              </div>
              <p className="text-sm text-muted-foreground mt-1">
                Usuários que saíram em menos de 3s
              </p>
            </CardContent>
          </Card>

          <Card>
            <CardHeader>
              <CardTitle className="flex items-center gap-2">
                <MessageSquare className="h-5 w-5" />
                Inquiries
              </CardTitle>
            </CardHeader>
            <CardContent>
              <div className="text-3xl font-bold">{analytics.inquiries}</div>
              <p className="text-sm text-muted-foreground mt-1">
                Mensagens recebidas
              </p>
            </CardContent>
          </Card>

          <Card>
            <CardHeader>
              <CardTitle className="flex items-center gap-2">
                <Heart className="h-5 w-5" />
                Favoritos
              </CardTitle>
            </CardHeader>
            <CardContent>
              <div className="text-3xl font-bold">{analytics.favorites}</div>
              <p className="text-sm text-muted-foreground mt-1">
                Usuários que favoritaram
              </p>
            </CardContent>
          </Card>

          {analytics.conversion_rate > 0 && (
            <Card>
              <CardHeader>
                <CardTitle>Taxa de Conversão</CardTitle>
              </CardHeader>
              <CardContent>
                <div className="text-3xl font-bold">
                  {analytics.conversion_rate.toFixed(2)}%
                </div>
                <p className="text-sm text-muted-foreground mt-1">
                  Taxa de vendas
                </p>
              </CardContent>
            </Card>
          )}

          {analytics.time_to_sell && (
            <Card>
              <CardHeader>
                <CardTitle>Tempo até Venda</CardTitle>
              </CardHeader>
              <CardContent>
                <div className="text-3xl font-bold">
                  {Math.round(analytics.time_to_sell)}h
                </div>
                <p className="text-sm text-muted-foreground mt-1">
                  Tempo médio até ser vendido
                </p>
              </CardContent>
            </Card>
          )}
        </div>
      )}
    </div>
  );
}