"use client";

import React, { useEffect, useState } from "react";
import { useParams, useSearchParams } from "next/navigation";
import { Button } from "@/components/ui/button";
import { Loader2, ArrowLeft, Smartphone, Tablet, RotateCcw, RotateCw } from "lucide-react";
import { screenApi } from "@/lib/api/screen";
import { ScreenDefinition, LayoutData } from "@/types/screen";
import { useRouter } from "next/navigation";
import { toast } from "sonner";
import { initializeComponents } from "@/lib/registry/components";
import { DynamicComponentRenderer } from "@/lib/registry/DynamicComponentRenderer";
import { ScreenPreviewProvider } from "@/contexts/ScreenPreviewContext";
import { useAuth } from "@/hooks/useAuth";
import { TableOptionsProvider } from "@/contexts/TableOptionsContext";
import { TableSearchWidgetHeightProvider } from "@/contexts/TableSearchWidgetHeightContext";
import { ScreenContextProvider } from "@/contexts/ScreenContext";
import { SplitPanelProvider } from "@/lib/registry/components/split-panel-layout/SplitPanelContext";
import { ActiveTabProvider } from "@/contexts/ActiveTabContext";
import { ScreenMultiLangProvider } from "@/contexts/ScreenMultiLangContext";
import {
  PopLayoutDataV3,
  PopLayoutModeKey,
  ensureV3Layout,
  isV3Layout,
} from "@/components/pop/designer/types/pop-layout";
import {
  PopLayoutRenderer,
  hasBaseLayout,
  getEffectiveModeLayout,
} from "@/components/pop/designer/renderers";
import { 
  useResponsiveMode, 
  useResponsiveModeWithOverride,
  type DeviceType,
} from "@/hooks/useDeviceOrientation";

// 디바이스별 크기 (프리뷰 모드용)
const DEVICE_SIZES: Record<DeviceType, Record<"landscape" | "portrait", { width: number; height: number; label: string }>> = {
  mobile: {
    landscape: { width: 667, height: 375, label: "모바일 가로" },
    portrait: { width: 375, height: 667, label: "모바일 세로" },
  },
  tablet: {
    landscape: { width: 1024, height: 768, label: "태블릿 가로" },
    portrait: { width: 768, height: 1024, label: "태블릿 세로" },
  },
};

// ========================================
// 헬퍼 함수
// ========================================

const getModeKey = (device: DeviceType, isLandscape: boolean): PopLayoutModeKey => {
  if (device === "tablet") {
    return isLandscape ? "tablet_landscape" : "tablet_portrait";
  }
  return isLandscape ? "mobile_landscape" : "mobile_portrait";
};

// v3.0 레이아웃인지 확인
const isPopLayoutV3 = (layout: any): layout is PopLayoutDataV3 => {
  return layout && layout.version === "pop-3.0" && layout.layouts && layout.components;
};

// v1/v2 레이아웃인지 확인 (마이그레이션 대상)
const isPopLayout = (layout: any): boolean => {
  return layout && (
    layout.version === "pop-1.0" ||
    layout.version === "pop-2.0" ||
    layout.version === "pop-3.0"
  );
};

// ========================================
// 메인 컴포넌트
// ========================================

function PopScreenViewPage() {
  const params = useParams();
  const searchParams = useSearchParams();
  const router = useRouter();
  const screenId = parseInt(params.screenId as string);

  const isPreviewMode = searchParams.get("preview") === "true";

  // 반응형 모드 감지 (화면 크기에 따라 tablet/mobile, landscape/portrait 자동 전환)
  // 프리뷰 모드에서는 수동 전환 가능
  const { mode, setDevice, setOrientation, isAutoDetect } = useResponsiveModeWithOverride(
    isPreviewMode ? "tablet" : undefined,
    isPreviewMode ? true : undefined
  );

  // 현재 모드 정보
  const deviceType = mode.device;
  const isLandscape = mode.isLandscape;
  const currentModeKey = mode.modeKey;

  const { user, userName, companyCode } = useAuth();

  const [screen, setScreen] = useState<ScreenDefinition | null>(null);
  const [layout, setLayout] = useState<LayoutData | null>(null);
  const [popLayoutV3, setPopLayoutV3] = useState<PopLayoutDataV3 | null>(null);
  const [loading, setLoading] = useState(true);
  const [error, setError] = useState<string | null>(null);

  const [formData, setFormData] = useState<Record<string, unknown>>({});
  const [selectedRowsData, setSelectedRowsData] = useState<any[]>([]);
  const [tableRefreshKey, setTableRefreshKey] = useState(0);

  // 컴포넌트 초기화
  useEffect(() => {
    const initComponents = async () => {
      try {
        await initializeComponents();
      } catch (error) {
        console.error("POP 화면 컴포넌트 초기화 실패:", error);
      }
    };
    initComponents();
  }, []);

  // 화면 및 POP 레이아웃 로드
  useEffect(() => {
    const loadScreen = async () => {
      try {
        setLoading(true);
        setError(null);

        const screenData = await screenApi.getScreen(screenId);
        setScreen(screenData);

        try {
          const popLayout = await screenApi.getLayoutPop(screenId);

          if (popLayout && isPopLayout(popLayout)) {
            // v1/v2/v3 → v3로 변환
            const v3Layout = ensureV3Layout(popLayout);
            setPopLayoutV3(v3Layout);
            
            const componentCount = Object.keys(v3Layout.components).length;
            console.log(`[POP] v3 레이아웃 로드됨: ${componentCount}개 컴포넌트`);
            
            if (!isV3Layout(popLayout)) {
              console.log("[POP] v1/v2 → v3 자동 마이그레이션 완료");
            }
          } else if (popLayout && popLayout.components && Array.isArray(popLayout.components) && popLayout.components.length > 0) {
            // 이전 형식 (레거시 components 구조)
            console.log("[POP] 레거시 레이아웃 로드:", popLayout.components.length, "개 컴포넌트");
            setLayout(popLayout as LayoutData);
          } else {
            console.log("[POP] 레이아웃 없음");
            setPopLayoutV3(null);
            setLayout(null);
          }
        } catch (layoutError) {
          console.warn("[POP] 레이아웃 로드 실패:", layoutError);
          setPopLayoutV3(null);
          setLayout(null);
        }
      } catch (error) {
        console.error("[POP] 화면 로드 실패:", error);
        setError("화면을 불러오는데 실패했습니다.");
        toast.error("화면을 불러오는데 실패했습니다.");
      } finally {
        setLoading(false);
      }
    };

    if (screenId) {
      loadScreen();
    }
  }, [screenId]);

  const currentDevice = DEVICE_SIZES[deviceType][isLandscape ? "landscape" : "portrait"];

  if (loading) {
    return (
      <div className="flex h-screen w-full items-center justify-center bg-gray-100">
        <div className="text-center">
          <Loader2 className="mx-auto h-10 w-10 animate-spin text-blue-500" />
          <p className="mt-4 text-gray-600">POP 화면 로딩 중...</p>
        </div>
      </div>
    );
  }

  if (error || !screen) {
    return (
      <div className="flex h-screen w-full items-center justify-center bg-gray-100">
        <div className="text-center max-w-md p-6">
          <div className="mx-auto mb-4 flex h-16 w-16 items-center justify-center rounded-full bg-red-100">
            <span className="text-2xl">!</span>
          </div>
          <h2 className="mb-2 text-xl font-bold text-gray-800">화면을 찾을 수 없습니다</h2>
          <p className="mb-4 text-gray-600">{error || "요청하신 POP 화면이 존재하지 않습니다."}</p>
          <Button onClick={() => router.back()} variant="outline">
            <ArrowLeft className="mr-2 h-4 w-4" />
            돌아가기
          </Button>
        </div>
      </div>
    );
  }

  return (
    <ScreenPreviewProvider isPreviewMode={isPreviewMode}>
      <ActiveTabProvider>
        <TableOptionsProvider>
          <div className="h-screen bg-gray-100 flex flex-col overflow-hidden">
            {/* 상단 툴바 (프리뷰 모드에서만) */}
            {isPreviewMode && (
              <div className="sticky top-0 z-50 bg-white border-b shadow-sm">
                <div className="flex items-center justify-between px-4 py-2">
                  <div className="flex items-center gap-2">
                    <Button variant="ghost" size="sm" onClick={() => window.close()}>
                      <ArrowLeft className="h-4 w-4 mr-1" />
                      닫기
                    </Button>
                    <span className="text-sm font-medium">{screen.screenName}</span>
                    <span className="text-xs text-gray-400">
                      ({currentModeKey.replace("_", " ")})
                    </span>
                  </div>

                  <div className="flex items-center gap-2">
                    <div className="flex items-center gap-1 bg-gray-100 rounded-lg p-1">
                      <Button
                        variant={deviceType === "mobile" ? "default" : "ghost"}
                        size="sm"
                        onClick={() => setDevice("mobile")}
                        className="gap-1"
                      >
                        <Smartphone className="h-4 w-4" />
                        모바일
                      </Button>
                      <Button
                        variant={deviceType === "tablet" ? "default" : "ghost"}
                        size="sm"
                        onClick={() => setDevice("tablet")}
                        className="gap-1"
                      >
                        <Tablet className="h-4 w-4" />
                        태블릿
                      </Button>
                    </div>

                    <div className="flex items-center gap-1 bg-gray-100 rounded-lg p-1">
                      <Button
                        variant={isLandscape ? "default" : "ghost"}
                        size="sm"
                        onClick={() => setOrientation(true)}
                        className="gap-1"
                      >
                        <RotateCw className="h-4 w-4" />
                        가로
                      </Button>
                      <Button
                        variant={!isLandscape ? "default" : "ghost"}
                        size="sm"
                        onClick={() => setOrientation(false)}
                        className="gap-1"
                      >
                        <RotateCcw className="h-4 w-4" />
                        세로
                      </Button>
                    </div>

                    {/* 자동 감지 모드 버튼 */}
                    <Button
                      variant={isAutoDetect ? "default" : "outline"}
                      size="sm"
                      onClick={() => {
                        setDevice(undefined);
                        setOrientation(undefined);
                      }}
                      className="gap-1"
                    >
                      자동
                    </Button>
                  </div>

                  <Button variant="ghost" size="sm" onClick={() => window.location.reload()}>
                    <RotateCcw className="h-4 w-4" />
                  </Button>
                </div>
              </div>
            )}

            {/* POP 화면 컨텐츠 */}
            <div className={`flex-1 flex flex-col ${isPreviewMode ? "py-4 overflow-auto items-center" : ""}`}>
              {/* 현재 모드 표시 (일반 모드) */}
              {!isPreviewMode && (
                <div className="absolute top-2 right-2 z-10 bg-black/50 text-white text-xs px-2 py-1 rounded">
                  {currentModeKey.replace("_", " ")}
                </div>
              )}

              <div
                className={`bg-white transition-all duration-300 ${isPreviewMode ? "shadow-2xl rounded-3xl overflow-hidden border-8 border-gray-800" : "w-full h-full"}`}
                style={isPreviewMode ? {
                  width: currentDevice.width,
                  height: currentDevice.height,
                  flexShrink: 0,
                } : undefined}
              >
                {/* POP 레이아웃 v3.0 렌더링 */}
                {popLayoutV3 ? (
                  <PopLayoutV3Renderer
                    layout={popLayoutV3}
                    modeKey={currentModeKey}
                  />
                ) : layout && layout.components && layout.components.length > 0 ? (
                  // 레거시 형식 (components 구조) - 호환성 유지
                  <ScreenMultiLangProvider components={layout.components} companyCode={companyCode}>
                    <div className="relative w-full min-h-full p-4">
                      {layout.components
                        .filter((component) => !component.parentId)
                        .map((component) => (
                          <div
                            key={component.id}
                            style={{
                              position: component.position ? "absolute" : "relative",
                              left: component.position?.x || 0,
                              top: component.position?.y || 0,
                              width: component.size?.width || "100%",
                              height: component.size?.height || "auto",
                              zIndex: component.position?.z || 1,
                            }}
                          >
                            <DynamicComponentRenderer
                              component={component}
                              isDesignMode={false}
                              isInteractive={true}
                              formData={formData}
                              onDataflowComplete={() => { }}
                              screenId={screenId}
                              tableName={screen?.tableName}
                              userId={user?.userId}
                              userName={userName}
                              companyCode={companyCode}
                              selectedRowsData={selectedRowsData}
                              onSelectedRowsChange={(_, selectedData) => {
                                setSelectedRowsData(selectedData);
                              }}
                              refreshKey={tableRefreshKey}
                              onRefresh={() => {
                                setTableRefreshKey((prev) => prev + 1);
                                setSelectedRowsData([]);
                              }}
                              onFormDataChange={(fieldName, value) => {
                                setFormData((prev) => ({ ...prev, [fieldName]: value }));
                              }}
                            />
                          </div>
                        ))}
                    </div>
                  </ScreenMultiLangProvider>
                ) : (
                  // 빈 화면
                  <div className="flex flex-col items-center justify-center min-h-[400px] p-8 text-center">
                    <div className="w-16 h-16 rounded-full bg-gray-100 flex items-center justify-center mb-4">
                      <Smartphone className="h-8 w-8 text-gray-400" />
                    </div>
                    <h3 className="text-lg font-semibold text-gray-800 mb-2">
                      화면이 비어있습니다
                    </h3>
                    <p className="text-sm text-gray-500 max-w-xs">
                      POP 화면 디자이너에서 컴포넌트를 추가하여 화면을 구성하세요.
                    </p>
                  </div>
                )}
              </div>
            </div>
          </div>
        </TableOptionsProvider>
      </ActiveTabProvider>
    </ScreenPreviewProvider>
  );
}

// ========================================
// POP 레이아웃 v3.0 렌더러
// ========================================
interface PopLayoutV3RendererProps {
  layout: PopLayoutDataV3;
  modeKey: PopLayoutModeKey;
}

function PopLayoutV3Renderer({ layout, modeKey }: PopLayoutV3RendererProps) {
  // 태블릿 가로 모드가 기준으로 설정되어 있는지 확인
  if (!hasBaseLayout(layout)) {
    return (
      <div className="flex flex-col items-center justify-center min-h-[400px] p-8 text-center">
        <div className="w-16 h-16 rounded-full bg-yellow-100 flex items-center justify-center mb-4">
          <span className="text-2xl">!</span>
        </div>
        <h3 className="text-lg font-semibold text-gray-800 mb-2">
          화면이 설정되지 않았습니다
        </h3>
        <p className="text-sm text-gray-500 max-w-xs">
          POP 화면 디자이너에서 태블릿 가로 모드 레이아웃을 먼저 설정해주세요.
        </p>
      </div>
    );
  }

  // 현재 모드에 맞는 레이아웃 가져오기
  const { modeLayout, isConverted, sourceModeKey } = getEffectiveModeLayout(layout, modeKey);

  return (
    <div className="w-full h-full flex flex-col">
      {isConverted && (
        <div className="mx-2 mt-2 px-2 py-1 bg-yellow-50 border border-yellow-200 rounded text-xs text-yellow-700 shrink-0">
          {sourceModeKey} 기준 자동 변환됨
        </div>
      )}

      <PopLayoutRenderer
        layout={layout}
        modeKey={modeKey}
        customModeLayout={isConverted ? modeLayout : undefined}
        isDesignMode={false}
        className="flex-1"
        style={{ height: "100%" }}
      />
    </div>
  );
}

// Provider 래퍼
export default function PopScreenViewPageWrapper() {
  return (
    <TableSearchWidgetHeightProvider>
      <ScreenContextProvider>
        <SplitPanelProvider>
          <PopScreenViewPage />
        </SplitPanelProvider>
      </ScreenContextProvider>
    </TableSearchWidgetHeightProvider>
  );
}