"use client";

import { useCallback, useEffect, useRef, useState } from "react";
import { ChevronDown, ChevronUp } from "lucide-react";
import { useShallow } from "zustand/react/shallow";
import { cn } from "@/lib/utils";
import { Button } from "@/components/ui/button";
import { useKisRuntimeStore } from "@/features/dashboard/store/use-kis-runtime-store";
import { KisAuthForm } from "@/features/dashboard/components/auth/KisAuthForm";
import { StockSearchForm } from "@/features/dashboard/components/search/StockSearchForm";
import { StockSearchResults } from "@/features/dashboard/components/search/StockSearchResults";
import { useStockSearch } from "@/features/dashboard/hooks/useStockSearch";
import { useOrderBook } from "@/features/dashboard/hooks/useOrderBook";
import { useKisTradeWebSocket } from "@/features/dashboard/hooks/useKisTradeWebSocket";
import { useStockOverview } from "@/features/dashboard/hooks/useStockOverview";
import { useCurrentPrice } from "@/features/dashboard/hooks/useCurrentPrice";
import { DashboardLayout } from "@/features/dashboard/components/layout/DashboardLayout";
import { StockHeader } from "@/features/dashboard/components/header/StockHeader";
import { OrderBook } from "@/features/dashboard/components/orderbook/OrderBook";
import { OrderForm } from "@/features/dashboard/components/order/OrderForm";
import { StockLineChart } from "@/features/dashboard/components/chart/StockLineChart";
import type {
  DashboardStockItem,
  DashboardStockOrderBookResponse,
  DashboardStockSearchItem,
} from "@/features/dashboard/types/dashboard.types";

/**
 * @description 대시보드 메인 컨테이너
 * @see app/(main)/dashboard/page.tsx 로그인 완료 후 이 컴포넌트를 렌더링합니다.
 * @see features/dashboard/hooks/useStockSearch.ts 검색 입력/요청 상태를 관리합니다.
 * @see features/dashboard/hooks/useStockOverview.ts 선택 종목 상세 상태를 관리합니다.
 */
export function DashboardContainer() {
  const skipNextAutoSearchRef = useRef(false);
  const hasInitializedAuthPanelRef = useRef(false);

  // 모바일에서는 초기 진입 시 API 키 패널을 접어서 본문(차트/호가)을 먼저 보이게 합니다.
  const [isMobileViewport, setIsMobileViewport] = useState(false);
  const [isAuthPanelExpanded, setIsAuthPanelExpanded] = useState(true);

  const { verifiedCredentials, isKisVerified } = useKisRuntimeStore(
    useShallow((state) => ({
      verifiedCredentials: state.verifiedCredentials,
      isKisVerified: state.isKisVerified,
    })),
  );

  const {
    keyword,
    setKeyword,
    searchResults,
    setSearchResults,
    setError: setSearchError,
    isSearching,
    search,
    clearSearch,
  } = useStockSearch();

  const { selectedStock, loadOverview, updateRealtimeTradeTick } =
    useStockOverview();

  // 호가 실시간 데이터 (체결 WS에서 동일 소켓으로 수신)
  const [realtimeOrderBook, setRealtimeOrderBook] =
    useState<DashboardStockOrderBookResponse | null>(null);

  const handleOrderBookMessage = useCallback(
    (data: DashboardStockOrderBookResponse) => {
      setRealtimeOrderBook(data);
    },
    [],
  );

  // 1. Trade WebSocket (체결 + 호가 통합)
  const { latestTick, recentTradeTicks } = useKisTradeWebSocket(
    selectedStock?.symbol,
    verifiedCredentials,
    isKisVerified,
    updateRealtimeTradeTick,
    {
      orderBookSymbol: selectedStock?.symbol,
      onOrderBookMessage: handleOrderBookMessage,
    },
  );

  // 2. OrderBook (REST 초기 조회 + WS 실시간 병합)
  const { orderBook, isLoading: isOrderBookLoading } = useOrderBook(
    selectedStock?.symbol,
    selectedStock?.market,
    verifiedCredentials,
    isKisVerified,
    {
      enabled: !!selectedStock && !!verifiedCredentials && isKisVerified,
      externalRealtimeOrderBook: realtimeOrderBook,
    },
  );

  // 3. Price Calculation Logic (Hook)
  const {
    currentPrice,
    change,
    changeRate,
    prevClose: referencePrice,
  } = useCurrentPrice({
    stock: selectedStock,
    latestTick,
    orderBook,
  });

  useEffect(() => {
    const mediaQuery = window.matchMedia("(max-width: 767px)");

    const applyViewportMode = (matches: boolean) => {
      setIsMobileViewport(matches);

      // 최초 1회: 모바일이면 접힘, 데스크탑이면 펼침.
      if (!hasInitializedAuthPanelRef.current) {
        setIsAuthPanelExpanded(!matches);
        hasInitializedAuthPanelRef.current = true;
        return;
      }

      // 데스크탑으로 돌아오면 항상 펼쳐 사용성을 유지합니다.
      if (!matches) {
        setIsAuthPanelExpanded(true);
      }
    };

    applyViewportMode(mediaQuery.matches);

    const onViewportChange = (event: MediaQueryListEvent) => {
      applyViewportMode(event.matches);
    };
    mediaQuery.addEventListener("change", onViewportChange);

    return () => mediaQuery.removeEventListener("change", onViewportChange);
  }, []);

  useEffect(() => {
    if (skipNextAutoSearchRef.current) {
      skipNextAutoSearchRef.current = false;
      return;
    }

    if (!isKisVerified || !verifiedCredentials) {
      clearSearch();
      return;
    }

    const trimmed = keyword.trim();
    if (!trimmed) {
      clearSearch();
      return;
    }

    const timer = window.setTimeout(() => {
      search(trimmed, verifiedCredentials);
    }, 220);

    return () => window.clearTimeout(timer);
  }, [keyword, isKisVerified, verifiedCredentials, search, clearSearch]);

  function handleSearchSubmit(e: React.FormEvent) {
    e.preventDefault();
    if (!isKisVerified || !verifiedCredentials) {
      setSearchError("API 키 검증을 먼저 완료해 주세요.");
      return;
    }
    search(keyword, verifiedCredentials);
  }

  function handleSelectStock(item: DashboardStockSearchItem) {
    if (!isKisVerified || !verifiedCredentials) {
      setSearchError("API 키 검증을 먼저 완료해 주세요.");
      return;
    }

    // 이미 선택된 종목을 다시 누른 경우 불필요한 개요 API 재호출을 막습니다.
    if (selectedStock?.symbol === item.symbol) {
      setSearchResults([]);
      return;
    }

    // 카드 선택으로 keyword가 바뀔 때 자동 검색이 다시 돌지 않도록 1회 건너뜁니다.
    skipNextAutoSearchRef.current = true;
    setKeyword(item.name);
    setSearchResults([]);
    loadOverview(item.symbol, verifiedCredentials, item.market);
  }

  return (
    <div className="relative h-full flex flex-col">
      {/* ========== AUTH STATUS ========== */}
      <div className="flex-none border-b bg-muted/40 transition-all duration-300 ease-in-out">
        <div className="flex items-center justify-between gap-2 px-3 py-2 text-xs sm:px-4">
          <div className="flex items-center gap-2">
            <span className="font-semibold">KIS API 연결 상태:</span>
            {isKisVerified ? (
              <span className="text-green-600 font-medium flex items-center">
                <span className="mr-1.5 h-2 w-2 rounded-full bg-green-500 ring-2 ring-green-100" />
                연결됨 (
                {verifiedCredentials?.tradingEnv === "real" ? "실전" : "모의"})
              </span>
            ) : (
              <span className="text-muted-foreground flex items-center">
                <span className="mr-1.5 h-2 w-2 rounded-full bg-gray-300" />
                미연결
              </span>
            )}
          </div>

          <Button
            type="button"
            size="sm"
            variant="outline"
            onClick={() => setIsAuthPanelExpanded((prev) => !prev)}
            className={cn(
              "h-8 shrink-0 gap-1.5 px-2.5 text-[11px] font-semibold",
              "border-brand-200 bg-brand-50 text-brand-700 hover:bg-brand-100",
              !isAuthPanelExpanded && isMobileViewport && "ring-2 ring-brand-200",
            )}
          >
            {isAuthPanelExpanded ? (
              <>
                <ChevronUp className="h-3.5 w-3.5" />
                API 설정 접기
              </>
            ) : (
              <>
                <ChevronDown className="h-3.5 w-3.5" />
                API 설정 펼치기
              </>
            )}
          </Button>
        </div>

        <div
          className={cn(
            "overflow-hidden transition-[max-height,opacity] duration-300 ease-in-out",
            isAuthPanelExpanded
              ? "max-h-[560px] opacity-100"
              : "max-h-0 opacity-0",
          )}
        >
          <div className="p-4 border-t bg-background">
            <KisAuthForm />
          </div>
        </div>
      </div>

      {/* ========== SEARCH ========== */}
      <div className="flex-none p-4 border-b bg-background/95 backdrop-blur-sm z-30">
        <div className="max-w-2xl mx-auto space-y-2 relative">
          <StockSearchForm
            keyword={keyword}
            onKeywordChange={setKeyword}
            onSubmit={handleSearchSubmit}
            disabled={!isKisVerified}
            isLoading={isSearching}
          />
          {searchResults.length > 0 && (
            <div className="absolute top-full left-0 right-0 mt-1 z-50 bg-background border rounded-md shadow-lg max-h-80 overflow-y-auto overflow-x-hidden">
              <StockSearchResults
                items={searchResults}
                onSelect={handleSelectStock}
                selectedSymbol={
                  (selectedStock as DashboardStockItem | null)?.symbol
                }
              />
            </div>
          )}
        </div>
      </div>

      {/* ========== MAIN CONTENT ========== */}
      <div
        className={cn(
          "transition-opacity duration-200 h-full flex-1 min-h-0 overflow-x-hidden",
          !selectedStock && "opacity-20 pointer-events-none",
        )}
      >
        <DashboardLayout
          header={
            selectedStock ? (
              <StockHeader
                stock={selectedStock}
                price={currentPrice?.toLocaleString() ?? "0"}
                change={change?.toLocaleString() ?? "0"}
                changeRate={changeRate?.toFixed(2) ?? "0.00"}
                high={latestTick ? latestTick.high.toLocaleString() : undefined} // High/Low/Vol only from Tick or Static
                low={latestTick ? latestTick.low.toLocaleString() : undefined}
                volume={
                  latestTick
                    ? latestTick.accumulatedVolume.toLocaleString()
                    : undefined
                }
              />
            ) : null
          }
          chart={
            selectedStock ? (
              <div className="p-0 h-full flex flex-col">
                <StockLineChart
                  symbol={selectedStock.symbol}
                  candles={selectedStock.candles}
                  credentials={verifiedCredentials}
                  latestTick={latestTick}
                />
              </div>
            ) : (
              <div className="h-full flex items-center justify-center text-muted-foreground">
                차트 영역
              </div>
            )
          }
          orderBook={
            <OrderBook
              symbol={selectedStock?.symbol}
              referencePrice={referencePrice}
              currentPrice={currentPrice}
              latestTick={latestTick}
              recentTicks={recentTradeTicks}
              orderBook={orderBook}
              isLoading={isOrderBookLoading}
            />
          }
          orderForm={<OrderForm stock={selectedStock ?? undefined} />}
        />
      </div>
    </div>
  );
}