"use client";

import { Loader2, TrendingUp } from "lucide-react";
import { useEffect, useState } from "react";
import { Badge } from "@/components/ui/badge";
import { Button } from "@/components/ui/button";
import {
  Dialog,
  DialogContent,
  DialogDescription,
  DialogHeader,
  DialogTitle,
} from "@/components/ui/dialog";
import { Input } from "@/components/ui/input";
import { Label } from "@/components/ui/label";
import {
  Select,
  SelectContent,
  SelectItem,
  SelectTrigger,
  SelectValue,
} from "@/components/ui/select";
import { Separator } from "@/components/ui/separator";
import { useSession } from "@/lib/hooks/use-session";

interface Listing {
  listing_id: number;
  item_name: string;
  quantity: number;
  current_bid_amount: number | null;
  min_bid_increment: number | null;
  initial_price_pix: number | null;
  initial_price_tibia_coins: number | null;
  initial_price_gold_coins: number | null;
  price_pix: number | null;
  price_tibia_coins: number | null;
  price_gold_coins: number | null;
  auction_ends_at: Date | null;
}

interface BidModalProps {
  open: boolean;
  onOpenChange: (open: boolean) => void;
  listing: Listing | null;
  onSuccess?: () => void;
}

export function BidModal({
  open,
  onOpenChange,
  listing,
  onSuccess,
}: BidModalProps) {
  const { user } = useSession();
  const [bidAmount, setBidAmount] = useState<string>("");
  const [paymentMethod, setPaymentMethod] = useState<string>("");
  const [loading, setLoading] = useState(false);
  const [error, setError] = useState<string | null>(null);
  const [bidHistory, setBidHistory] = useState<
    Array<{
      bid_id: number;
      bidder_id: number;
      bidder_name: string;
      bid_amount: number;
      bid_type: string | null;
      created_at: Date;
    }>
  >([]);
  const [loadingHistory, setLoadingHistory] = useState(false);

  if (!listing) return null;

  // Calcular valores
  const currentBid = listing.current_bid_amount || 0;
  const minIncrement = listing.min_bid_increment || 10;
  const minBid = currentBid + minIncrement;
  const initialPrice =
    listing.initial_price_pix ||
    listing.initial_price_tibia_coins ||
    listing.initial_price_gold_coins ||
    0;

  // Determinar métodos de pagamento disponíveis para lance
  const availableMethods: string[] = [];
  if (listing.price_pix || listing.initial_price_pix)
    availableMethods.push("pix");
  if (listing.price_tibia_coins || listing.initial_price_tibia_coins)
    availableMethods.push("tc");
  if (listing.price_gold_coins || listing.initial_price_gold_coins)
    availableMethods.push("gp");

  // Selecionar primeiro método disponível por padrão
  useEffect(() => {
    if (availableMethods.length > 0 && !paymentMethod) {
      setPaymentMethod(availableMethods[0]);
    }
  }, [paymentMethod]);

  // Atualizar valor do lance quando mudar
  useEffect(() => {
    if (bidAmount === "" && minBid > 0) {
      setBidAmount(minBid.toFixed(2));
    }
  }, [minBid, bidAmount]);

  // Buscar histórico de lances quando abrir modal
  useEffect(() => {
    if (open && listing) {
      fetchBidHistory();
    }
  }, [open, listing?.listing_id, fetchBidHistory, listing]);

  const fetchBidHistory = async () => {
    if (!listing) return;

    setLoadingHistory(true);
    try {
      const res = await fetch(
        `/api/listings/${listing.listing_id}/bids?limit=5`,
      );
      if (res.ok) {
        const data = await res.json();
        if (data.success) {
          setBidHistory(data.bids || []);
        }
      }
    } catch (error) {
      console.error("Erro ao buscar histórico de lances:", error);
    } finally {
      setLoadingHistory(false);
    }
  };

  const handleBid = async () => {
    const amount = parseFloat(bidAmount);

    if (Number.isNaN(amount) || amount <= 0) {
      setError("Valor do lance inválido");
      return;
    }

    if (amount < minBid) {
      setError(
        `Lance mínimo é ${minBid.toFixed(2)} (lance atual: ${currentBid.toFixed(2)} + incremento: ${minIncrement.toFixed(2)})`,
      );
      return;
    }

    if (!paymentMethod) {
      setError("Selecione um método de pagamento");
      return;
    }

    setLoading(true);
    setError(null);

    try {
      const response = await fetch(`/api/listings/${listing.listing_id}/bid`, {
        method: "POST",
        headers: {
          "Content-Type": "application/json",
        },
        body: JSON.stringify({
          amount,
          payment_method: paymentMethod,
        }),
      });

      const data = await response.json();

      if (!response.ok || !data.success) {
        throw new Error(data.error || "Erro ao processar lance");
      }

      // Sucesso - atualizar histórico
      await fetchBidHistory();
      if (onSuccess) {
        onSuccess();
      }
      onOpenChange(false);
      setBidAmount("");
    } catch (err) {
      setError(err instanceof Error ? err.message : "Erro ao processar lance");
    } finally {
      setLoading(false);
    }
  };

  const formatPrice = (price: number | null) => {
    if (!price) return "N/A";
    return `R$ ${price.toFixed(2)}`;
  };

  return (
    <Dialog open={open} onOpenChange={onOpenChange}>
      <DialogContent className="sm:max-w-[500px]">
        <DialogHeader>
          <DialogTitle>Dar Lance</DialogTitle>
          <DialogDescription>
            Informe o valor do seu lance para este leilão
          </DialogDescription>
        </DialogHeader>

        <div className="space-y-4">
          {/* Resumo do item */}
          <div className="bg-muted p-4 rounded-lg">
            <h3 className="font-semibold mb-2">{listing.item_name}</h3>
            <p className="text-sm text-muted-foreground">
              Quantidade: {listing.quantity}
            </p>
          </div>

          <Separator />

          {/* Informações do leilão */}
          <div className="space-y-3">
            <div className="grid grid-cols-2 gap-4">
              <div>
                <Label className="text-xs text-muted-foreground">
                  Preço Inicial
                </Label>
                <p className="text-lg font-semibold">
                  {formatPrice(initialPrice)}
                </p>
              </div>
              <div>
                <Label className="text-xs text-muted-foreground">
                  Lance Atual
                </Label>
                <p className="text-lg font-semibold text-primary">
                  {currentBid > 0 ? formatPrice(currentBid) : "Sem lances"}
                </p>
              </div>
            </div>

            <div className="grid grid-cols-2 gap-4">
              <div>
                <Label className="text-xs text-muted-foreground">
                  Incremento Mínimo
                </Label>
                <p className="text-sm font-medium">
                  {formatPrice(minIncrement)}
                </p>
              </div>
              <div>
                <Label className="text-xs text-muted-foreground">
                  Lance Mínimo Necessário
                </Label>
                <p className="text-sm font-semibold text-green-600">
                  {formatPrice(minBid)}
                </p>
              </div>
            </div>

            {listing.auction_ends_at && (
              <div>
                <Label className="text-xs text-muted-foreground">
                  Término do Leilão
                </Label>
                <p className="text-sm">
                  {new Date(listing.auction_ends_at).toLocaleString("pt-BR")}
                </p>
              </div>
            )}
          </div>

          <Separator />

          {/* Histórico de lances */}
          {bidHistory.length > 0 && (
            <div className="space-y-2">
              <Label className="text-sm font-medium">
                Histórico de Lances (Últimos 5)
              </Label>
              <div className="bg-muted rounded-lg p-3 space-y-2 max-h-48 overflow-y-auto">
                {bidHistory.map((bid, index) => {
                  const isCurrentUser = user?.userId === bid.bidder_id;
                  const isHighest = index === 0;
                  return (
                    <div
                      key={bid.bid_id}
                      className={`p-2 rounded ${
                        isCurrentUser
                          ? "bg-primary/10 border border-primary/20"
                          : ""
                      } ${isHighest ? "border-l-2 border-l-primary" : ""}`}
                    >
                      <div className="flex items-center justify-between">
                        <div className="flex-1">
                          <div className="flex items-center gap-2">
                            <span className="font-medium text-sm">
                              {isCurrentUser ? "Você" : bid.bidder_name}
                            </span>
                            {isHighest && (
                              <Badge variant="secondary" className="text-xs">
                                Líder
                              </Badge>
                            )}
                            {isCurrentUser && (
                              <Badge variant="outline" className="text-xs">
                                Seu lance
                              </Badge>
                            )}
                          </div>
                          <p className="text-xs text-muted-foreground">
                            {new Date(bid.created_at).toLocaleString("pt-BR")}
                          </p>
                        </div>
                        <span className="font-semibold text-primary">
                          R$ {bid.bid_amount.toFixed(2)}
                        </span>
                      </div>
                    </div>
                  );
                })}
              </div>
            </div>
          )}

          {loadingHistory && (
            <div className="text-center text-sm text-muted-foreground py-4">
              Carregando histórico...
            </div>
          )}

          <Separator />

          {/* Input do lance */}
          <div className="space-y-2">
            <Label htmlFor="bid-amount">Valor do Lance (R$)</Label>
            <Input
              id="bid-amount"
              type="number"
              step="0.01"
              min={minBid}
              value={bidAmount}
              onChange={(e) => setBidAmount(e.target.value)}
              placeholder={minBid.toFixed(2)}
              className="text-lg"
            />
            <p className="text-xs text-muted-foreground">
              Valor mínimo: {formatPrice(minBid)}
            </p>
          </div>

          {/* Seleção de método de pagamento */}
          {availableMethods.length > 0 && (
            <div className="space-y-2">
              <Label htmlFor="payment-method">Método de Pagamento</Label>
              <Select value={paymentMethod} onValueChange={setPaymentMethod}>
                <SelectTrigger id="payment-method">
                  <SelectValue placeholder="Selecione o método" />
                </SelectTrigger>
                <SelectContent>
                  {availableMethods.map((method) => (
                    <SelectItem key={method} value={method}>
                      {method.toUpperCase()}
                    </SelectItem>
                  ))}
                </SelectContent>
              </Select>
            </div>
          )}

          {error && (
            <div className="bg-destructive/10 text-destructive p-3 rounded-lg text-sm">
              {error}
            </div>
          )}

          <Separator />

          {/* Botões */}
          <div className="flex gap-2 justify-end">
            <Button
              variant="outline"
              onClick={() => onOpenChange(false)}
              disabled={loading}
            >
              Cancelar
            </Button>
            <Button
              onClick={handleBid}
              disabled={
                loading ||
                !bidAmount ||
                parseFloat(bidAmount) < minBid ||
                !paymentMethod
              }
            >
              {loading ? (
                <>
                  <Loader2 className="h-4 w-4 mr-2 animate-spin" />
                  Processando...
                </>
              ) : (
                <>
                  <TrendingUp className="h-4 w-4 mr-2" />
                  Confirmar Lance
                </>
              )}
            </Button>
          </div>
        </div>
      </DialogContent>
    </Dialog>
  );
}