"use client";

import React, { useState, useCallback, useEffect, useRef } from "react";
import toast from "react-hot-toast";
import {
  ReactFlow,
  Node,
  Edge,
  Controls,
  Background,
  useNodesState,
  useEdgesState,
  BackgroundVariant,
  SelectionMode,
} from "@xyflow/react";
import "@xyflow/react/dist/style.css";
import { TableNode } from "./TableNode";
import { TableSelector } from "./TableSelector";
import { ConnectionSetupModal } from "./ConnectionSetupModal";
import { TableDefinition, TableRelationship, DataFlowAPI, DataFlowDiagram } from "@/lib/api/dataflow";

// 고유 ID 생성 함수
const generateUniqueId = (prefix: string, relationshipId?: number): string => {
  const timestamp = Date.now();
  const random = Math.random().toString(36).substr(2, 9);
  return `${prefix}-${relationshipId || timestamp}-${random}`;
};

// 테이블 노드 데이터 타입 정의
interface TableNodeData extends Record<string, unknown> {
  table: {
    tableName: string;
    displayName: string;
    description: string;
    columns: Array<{
      name: string;
      type: string;
      description: string;
    }>;
  };
  onColumnClick: (tableName: string, columnName: string) => void;
  selectedColumns: string[];
}

// 노드 및 엣지 타입 정의
const nodeTypes = {
  tableNode: TableNode,
};

const edgeTypes = {};

interface DataFlowDesignerProps {
  companyCode?: string;
  onSave?: (relationships: TableRelationship[]) => void;
  selectedDiagram?: DataFlowDiagram | string | null;
  relationshipId?: string;
  onBackToList?: () => void;
}

// TableRelationship 타입은 dataflow.ts에서 import

export const DataFlowDesigner: React.FC<DataFlowDesignerProps> = ({
  companyCode = "*",
  relationshipId,
  onSave,
  selectedDiagram,
  onBackToList, // eslint-disable-line @typescript-eslint/no-unused-vars
}) => {
  const [nodes, setNodes, onNodesChange] = useNodesState<Node<TableNodeData>>([]);
  const [edges, setEdges, onEdgesChange] = useEdgesState<Edge>([]);
  const [selectedColumns, setSelectedColumns] = useState<{
    [tableName: string]: string[];
  }>({});
  const [selectionOrder, setSelectionOrder] = useState<string[]>([]);
  const [selectedNodes, setSelectedNodes] = useState<string[]>([]);
  const [pendingConnection, setPendingConnection] = useState<{
    fromNode: { id: string; tableName: string; displayName: string };
    toNode: { id: string; tableName: string; displayName: string };
    fromColumn?: string;
    toColumn?: string;
    selectedColumnsData?: {
      [tableName: string]: {
        displayName: string;
        columns: string[];
      };
    };
  } | null>(null);
  const [relationships, setRelationships] = useState<TableRelationship[]>([]); // eslint-disable-line @typescript-eslint/no-unused-vars
  const toastShownRef = useRef(false); // eslint-disable-line @typescript-eslint/no-unused-vars

  // 키보드 이벤트 핸들러 (Del 키로 선택된 노드 삭제)
  useEffect(() => {
    const handleKeyDown = (event: KeyboardEvent) => {
      if (event.key === "Delete" && selectedNodes.length > 0) {
        // 선택된 노드들 삭제
        setNodes((prevNodes) => prevNodes.filter((node) => !selectedNodes.includes(node.id)));

        // 삭제된 노드들과 관련된 선택된 컬럼들도 정리
        const deletedTableNames = selectedNodes
          .filter((nodeId) => nodeId.startsWith("table-"))
          .map((nodeId) => nodeId.replace("table-", ""));

        setSelectedColumns((prev) => {
          const newColumns = { ...prev };
          deletedTableNames.forEach((tableName) => {
            delete newColumns[tableName];
          });
          return newColumns;
        });

        // 선택 순서도 정리
        setSelectionOrder((prev) => prev.filter((tableName) => !deletedTableNames.includes(tableName)));

        // 선택된 노드 초기화
        setSelectedNodes([]);

        toast.success(`${selectedNodes.length}개 테이블이 삭제되었습니다.`);
      }
    };

    window.addEventListener("keydown", handleKeyDown);
    return () => window.removeEventListener("keydown", handleKeyDown);
  }, [selectedNodes, setNodes]);

  // 컬럼 클릭 처리 (토글 방식, 최대 2개 테이블만 허용)
  const handleColumnClick = useCallback((tableName: string, columnName: string) => {
    setSelectedColumns((prev) => {
      const currentColumns = prev[tableName] || [];
      const isSelected = currentColumns.includes(columnName);
      const selectedTables = Object.keys(prev).filter((name) => prev[name] && prev[name].length > 0);

      if (isSelected) {
        // 선택 해제
        const newColumns = currentColumns.filter((column) => column !== columnName);
        if (newColumns.length === 0) {
          // eslint-disable-next-line @typescript-eslint/no-unused-vars
          const { [tableName]: removed, ...rest } = prev;
          // 선택 순서에서도 제거 (다음 렌더링에서)
          setTimeout(() => {
            setSelectionOrder((order) => order.filter((name) => name !== tableName));
          }, 0);
          return rest;
        }
        return { ...prev, [tableName]: newColumns };
      } else {
        // 새 선택
        if (selectedTables.length >= 2 && !selectedTables.includes(tableName)) {
          toast.error("최대 2개 테이블까지만 선택할 수 있습니다.");
          return prev;
        }

        const newColumns = [...currentColumns, columnName];
        const newSelection = { ...prev, [tableName]: newColumns };

        // 선택 순서 업데이트 (다음 렌더링에서)
        setTimeout(() => {
          setSelectionOrder((order) => {
            if (!order.includes(tableName)) {
              return [...order, tableName];
            }
            return order;
          });
        }, 0);

        return newSelection;
      }
    });
  }, []);

  // 선택된 관계도의 관계 로드
  const loadSelectedDiagramRelationships = useCallback(async () => {
    if (!relationshipId) return;

    try {
      console.log("🔍 관계도 로드 시작 (relationshipId):", relationshipId);
      toast.loading("관계도를 불러오는 중...", { id: "load-diagram" });

      // relationshipId로 해당 관계도의 모든 관계 조회
      const diagramRelationships = await DataFlowAPI.getDiagramRelationshipsByRelationshipId(relationshipId);
      console.log("📋 관계도 관계 데이터:", diagramRelationships);
      console.log("📋 첫 번째 관계 상세:", diagramRelationships[0]);
      console.log(
        "📋 관계 객체 키들:",
        diagramRelationships[0] ? Object.keys(diagramRelationships[0]) : "배열이 비어있음",
      );
      setRelationships(diagramRelationships);

      // 관계도의 모든 테이블 추출
      const tableNames = new Set<string>();
      diagramRelationships.forEach((rel) => {
        tableNames.add(rel.from_table_name);
        tableNames.add(rel.to_table_name);
      });
      console.log("📊 추출된 테이블 이름들:", Array.from(tableNames));

      // 테이블 정보 로드
      const allTables = await DataFlowAPI.getTables();
      console.log("🏢 전체 테이블 수:", allTables.length);
      const tableDefinitions: TableDefinition[] = [];

      for (const tableName of tableNames) {
        const foundTable = allTables.find((t) => t.tableName === tableName);
        console.log(`🔍 테이블 ${tableName} 검색 결과:`, foundTable);
        if (foundTable) {
          // 각 테이블의 컬럼 정보를 별도로 가져옴
          const columns = await DataFlowAPI.getTableColumns(tableName);
          console.log(`📋 테이블 ${tableName}의 컬럼 수:`, columns.length);
          tableDefinitions.push({
            tableName: foundTable.tableName,
            displayName: foundTable.displayName,
            description: foundTable.description,
            columns: columns,
          });
        } else {
          console.warn(`⚠️ 테이블 ${tableName}을 찾을 수 없습니다`);
        }
      }

      // 연결된 컬럼 정보 계산
      const connectedColumnsInfo: {
        [tableName: string]: { [columnName: string]: { direction: "source" | "target" | "both" } };
      } = {};

      diagramRelationships.forEach((rel) => {
        const fromTable = rel.from_table_name;
        const toTable = rel.to_table_name;
        const fromColumns = rel.from_column_name.split(",").map((col) => col.trim());
        const toColumns = rel.to_column_name.split(",").map((col) => col.trim());

        // 소스 테이블의 컬럼들을 source로 표시
        if (!connectedColumnsInfo[fromTable]) connectedColumnsInfo[fromTable] = {};
        fromColumns.forEach((col) => {
          if (connectedColumnsInfo[fromTable][col]) {
            connectedColumnsInfo[fromTable][col].direction = "both";
          } else {
            connectedColumnsInfo[fromTable][col] = { direction: "source" };
          }
        });

        // 타겟 테이블의 컬럼들을 target으로 표시
        if (!connectedColumnsInfo[toTable]) connectedColumnsInfo[toTable] = {};
        toColumns.forEach((col) => {
          if (connectedColumnsInfo[toTable][col]) {
            connectedColumnsInfo[toTable][col].direction = "both";
          } else {
            connectedColumnsInfo[toTable][col] = { direction: "target" };
          }
        });
      });

      // 테이블을 노드로 변환 (자동 레이아웃)
      const tableNodes = tableDefinitions.map((table, index) => {
        const x = (index % 3) * 400 + 100; // 3열 배치
        const y = Math.floor(index / 3) * 300 + 100;

        return {
          id: `table-${table.tableName}`,
          type: "tableNode",
          position: { x, y },
          data: {
            table: {
              tableName: table.tableName,
              displayName: table.displayName,
              description: table.description || "",
              columns: table.columns.map((col) => ({
                name: col.columnName,
                type: col.dataType || "varchar",
                description: col.description || "",
              })),
            },
            onColumnClick: handleColumnClick,
            selectedColumns: selectedColumns[table.tableName] || [],
            connectedColumns: connectedColumnsInfo[table.tableName] || {},
          } as TableNodeData,
        };
      });

      console.log("🎨 생성된 테이블 노드 수:", tableNodes.length);
      console.log("📍 테이블 노드 상세:", tableNodes);
      setNodes(tableNodes);

      // 관계를 엣지로 변환하여 표시 (컬럼별 연결)
      const relationshipEdges: Edge[] = [];

      diagramRelationships.forEach((rel) => {
        const fromTable = rel.from_table_name;
        const toTable = rel.to_table_name;
        const fromColumns = rel.from_column_name.split(",").map((col) => col.trim());
        const toColumns = rel.to_column_name.split(",").map((col) => col.trim());

        // 각 from 컬럼을 각 to 컬럼에 연결 (1:1 매핑이거나 many:many인 경우)
        const maxConnections = Math.max(fromColumns.length, toColumns.length);

        for (let i = 0; i < maxConnections; i++) {
          const fromColumn = fromColumns[i] || fromColumns[0]; // 컬럼이 부족하면 첫 번째 컬럼 재사용
          const toColumn = toColumns[i] || toColumns[0]; // 컬럼이 부족하면 첫 번째 컬럼 재사용

          relationshipEdges.push({
            id: generateUniqueId("edge", rel.relationship_id),
            source: `table-${fromTable}`,
            target: `table-${toTable}`,
            sourceHandle: `${fromTable}-${fromColumn}-source`,
            targetHandle: `${toTable}-${toColumn}-target`,
            type: "smoothstep",
            animated: false,
            style: {
              stroke: "#3b82f6",
              strokeWidth: 1.5,
              strokeDasharray: "none",
            },
            data: {
              relationshipId: rel.relationship_id,
              relationshipType: rel.relationship_type,
              connectionType: rel.connection_type,
              fromTable: fromTable,
              toTable: toTable,
              fromColumn: fromColumn,
              toColumn: toColumn,
            },
          });
        }
      });

      console.log("🔗 생성된 관계 에지 수:", relationshipEdges.length);
      console.log("📍 관계 에지 상세:", relationshipEdges);
      setEdges(relationshipEdges);
      toast.success("관계도를 불러왔습니다.", { id: "load-diagram" });
    } catch (error) {
      console.error("선택된 관계도 로드 실패:", error);
      toast.error("관계도를 불러오는데 실패했습니다.", { id: "load-diagram" });
    }
  }, [relationshipId, setNodes, setEdges, selectedColumns, handleColumnClick]);

  // 기존 관계 로드 (새 관계도 생성 시)
  const loadExistingRelationships = useCallback(async () => {
    if (selectedDiagram) return; // 선택된 관계도가 있으면 실행하지 않음

    try {
      const existingRelationships = await DataFlowAPI.getRelationshipsByCompany(companyCode);
      setRelationships(existingRelationships);

      // 기존 관계를 엣지로 변환하여 표시 (컬럼별 연결)
      const existingEdges: Edge[] = [];

      existingRelationships.forEach((rel) => {
        const fromTable = rel.from_table_name;
        const toTable = rel.to_table_name;
        const fromColumns = rel.from_column_name.split(",").map((col) => col.trim());
        const toColumns = rel.to_column_name.split(",").map((col) => col.trim());

        // 각 from 컬럼을 각 to 컬럼에 연결
        const maxConnections = Math.max(fromColumns.length, toColumns.length);

        for (let i = 0; i < maxConnections; i++) {
          const fromColumn = fromColumns[i] || fromColumns[0];
          const toColumn = toColumns[i] || toColumns[0];

          existingEdges.push({
            id: generateUniqueId("edge", rel.relationship_id),
            source: `table-${fromTable}`,
            target: `table-${toTable}`,
            sourceHandle: `${fromTable}-${fromColumn}-source`,
            targetHandle: `${toTable}-${toColumn}-target`,
            type: "smoothstep",
            animated: false,
            style: {
              stroke: "#3b82f6",
              strokeWidth: 1.5,
              strokeDasharray: "none",
            },
            data: {
              relationshipId: rel.relationship_id,
              relationshipType: rel.relationship_type,
              connectionType: rel.connection_type,
              fromTable: fromTable,
              toTable: toTable,
              fromColumn: fromColumn,
              toColumn: toColumn,
            },
          });
        }
      });

      setEdges(existingEdges);
    } catch (error) {
      console.error("기존 관계 로드 실패:", error);
      toast.error("기존 관계를 불러오는데 실패했습니다.");
    }
  }, [companyCode, setEdges, selectedDiagram]);

  // 컴포넌트 마운트 시 관계 로드
  useEffect(() => {
    if (companyCode) {
      if (relationshipId) {
        loadSelectedDiagramRelationships();
      } else {
        loadExistingRelationships();
      }
    }
  }, [companyCode, relationshipId, loadExistingRelationships, loadSelectedDiagramRelationships]);

  // 노드 선택 변경 핸들러
  const onSelectionChange = useCallback(({ nodes }: { nodes: Node<TableNodeData>[] }) => {
    const selectedNodeIds = nodes.map((node) => node.id);
    setSelectedNodes(selectedNodeIds);
  }, []);

  // 빈 onConnect 함수 (드래그 연결 비활성화)
  const onConnect = useCallback(() => {
    // 드래그로 연결하는 것을 방지
    return;
  }, []);

  // 선택된 컬럼이 변경될 때마다 기존 노드들 업데이트 및 selectionOrder 정리
  useEffect(() => {
    setNodes((prevNodes) =>
      prevNodes.map((node) => ({
        ...node,
        data: {
          ...node.data,
          selectedColumns: selectedColumns[node.data.table.tableName] || [],
        },
      })),
    );

    // selectionOrder에서 선택되지 않은 테이블들 제거
    const activeTables = Object.keys(selectedColumns).filter(
      (tableName) => selectedColumns[tableName] && selectedColumns[tableName].length > 0,
    );
    setSelectionOrder((prev) => prev.filter((tableName) => activeTables.includes(tableName)));
  }, [selectedColumns, setNodes]);

  // 연결 가능한 상태인지 확인
  const canCreateConnection = () => {
    const selectedTables = Object.keys(selectedColumns).filter(
      (tableName) => selectedColumns[tableName] && selectedColumns[tableName].length > 0,
    );

    // 최소 2개의 서로 다른 테이블에서 컬럼이 선택되어야 함
    return selectedTables.length >= 2;
  };

  // 컬럼 연결 설정 모달 열기
  const openConnectionModal = () => {
    const selectedTables = Object.keys(selectedColumns).filter(
      (tableName) => selectedColumns[tableName] && selectedColumns[tableName].length > 0,
    );

    if (selectedTables.length < 2) return;

    // 선택 순서에 따라 첫 번째와 두 번째 테이블 설정
    const orderedTables = selectionOrder.filter((name) => selectedTables.includes(name));
    const firstTableName = orderedTables[0];
    const secondTableName = orderedTables[1];
    const firstNode = nodes.find((node) => node.data.table.tableName === firstTableName);
    const secondNode = nodes.find((node) => node.data.table.tableName === secondTableName);

    if (!firstNode || !secondNode) return;

    // 첫 번째로 선택된 컬럼들 가져오기
    const firstTableColumns = selectedColumns[firstTableName] || [];
    const secondTableColumns = selectedColumns[secondTableName] || [];

    setPendingConnection({
      fromNode: {
        id: firstNode.id,
        tableName: firstNode.data.table.tableName,
        displayName: firstNode.data.table.displayName,
      },
      toNode: {
        id: secondNode.id,
        tableName: secondNode.data.table.tableName,
        displayName: secondNode.data.table.displayName,
      },
      // 선택된 첫 번째 컬럼을 연결 컬럼으로 설정
      fromColumn: firstTableColumns[0] || "",
      toColumn: secondTableColumns[0] || "",
      // 선택된 모든 컬럼 정보를 선택 순서대로 전달
      selectedColumnsData: (() => {
        const orderedData: { [key: string]: { displayName: string; columns: string[] } } = {};
        // selectionOrder 순서대로 데이터 구성 (첫 번째 선택이 먼저)
        orderedTables.forEach((tableName) => {
          const node = nodes.find((n) => n.data.table.tableName === tableName);
          if (node && selectedColumns[tableName]) {
            orderedData[tableName] = {
              displayName: node.data.table.displayName,
              columns: selectedColumns[tableName],
            };
          }
        });
        return orderedData;
      })(),
    });
  };

  // 실제 테이블 노드 추가
  const addTableNode = useCallback(
    async (table: TableDefinition) => {
      try {
        const newNode: Node<TableNodeData> = {
          id: `table-${table.tableName}`,
          type: "tableNode",
          position: { x: Math.random() * 300, y: Math.random() * 200 },
          data: {
            table: {
              tableName: table.tableName,
              displayName: table.displayName || table.tableName,
              description: table.description || "",
              columns: table.columns.map((col) => ({
                name: col.columnName || "unknown",
                type: col.dataType || col.dbType || "UNKNOWN",
                description:
                  col.columnLabel || col.displayName || col.description || col.columnName || "No description",
              })),
            },
            onColumnClick: handleColumnClick,
            selectedColumns: selectedColumns[table.tableName] || [],
          },
        };

        setNodes((nds) => nds.concat(newNode));
      } catch (error) {
        console.error("테이블 노드 추가 실패:", error);
        toast.error("테이블 정보를 불러오는데 실패했습니다.");
      }
    },
    [handleColumnClick, selectedColumns, setNodes],
  );

  // 샘플 테이블 노드 추가 (개발용)
  const addSampleNode = useCallback(() => {
    const tableName = `sample_table_${nodes.length + 1}`;
    const newNode: Node<TableNodeData> = {
      id: `sample-${Date.now()}`,
      type: "tableNode",
      position: { x: Math.random() * 300, y: Math.random() * 200 },
      data: {
        table: {
          tableName,
          displayName: `샘플 테이블 ${nodes.length + 1}`,
          description: `샘플 테이블 설명 ${nodes.length + 1}`,
          columns: [
            { name: "id", type: "INTEGER", description: "고유 식별자" },
            { name: "name", type: "VARCHAR(100)", description: "이름" },
            { name: "code", type: "VARCHAR(50)", description: "코드" },
            { name: "created_date", type: "TIMESTAMP", description: "생성일시" },
          ],
        },
        onColumnClick: handleColumnClick,
        selectedColumns: selectedColumns[tableName] || [],
      },
    };

    setNodes((nds) => nds.concat(newNode));
  }, [nodes.length, handleColumnClick, selectedColumns, setNodes]);

  // 노드 전체 삭제
  const clearNodes = useCallback(() => {
    setNodes([]);
    setEdges([]);
    setSelectedColumns({});
    setSelectionOrder([]);
    setSelectedNodes([]);
  }, [setNodes, setEdges]);

  // 현재 추가된 테이블명 목록 가져오기
  const getSelectedTableNames = useCallback(() => {
    return nodes.filter((node) => node.id.startsWith("table-")).map((node) => node.data.table.tableName);
  }, [nodes]);

  // 연결 설정 확인
  const handleConfirmConnection = useCallback(
    (relationship: TableRelationship) => {
      if (!pendingConnection) return;

      // 컬럼별 에지 생성
      const newEdges: Edge[] = [];
      const fromTable = relationship.from_table_name;
      const toTable = relationship.to_table_name;
      const fromColumns = relationship.from_column_name.split(",").map((col) => col.trim());
      const toColumns = relationship.to_column_name.split(",").map((col) => col.trim());

      const maxConnections = Math.max(fromColumns.length, toColumns.length);

      for (let i = 0; i < maxConnections; i++) {
        const fromColumn = fromColumns[i] || fromColumns[0];
        const toColumn = toColumns[i] || toColumns[0];

        newEdges.push({
          id: generateUniqueId("edge", relationship.relationship_id),
          source: pendingConnection.fromNode.id,
          target: pendingConnection.toNode.id,
          sourceHandle: `${fromTable}-${fromColumn}-source`,
          targetHandle: `${toTable}-${toColumn}-target`,
          type: "smoothstep",
          animated: false,
          style: {
            stroke: "#3b82f6",
            strokeWidth: 1.5,
            strokeDasharray: "none",
          },
          data: {
            relationshipId: relationship.relationship_id,
            relationshipType: relationship.relationship_type,
            connectionType: relationship.connection_type,
            fromTable: fromTable,
            toTable: toTable,
            fromColumn: fromColumn,
            toColumn: toColumn,
          },
        });
      }

      setEdges((eds) => [...eds, ...newEdges]);
      setRelationships((prev) => [...prev, relationship]);
      setPendingConnection(null);

      console.log("관계 생성 완료:", relationship);
      // 저장 콜백 호출 (필요한 경우)
      if (onSave) {
        // 현재 모든 관계를 수집하여 전달
        setRelationships((currentRelationships) => {
          onSave([...currentRelationships, relationship]);
          return currentRelationships;
        });
      }
    },
    [pendingConnection, setEdges, onSave],
  );

  // 연결 설정 취소
  const handleCancelConnection = useCallback(() => {
    setPendingConnection(null);
  }, []);

  return (
    <div className="data-flow-designer h-screen bg-gray-100">
      <div className="flex h-full">
        {/* 사이드바 */}
        <div className="w-80 border-r border-gray-200 bg-white shadow-lg">
          <div className="p-6">
            <h2 className="mb-6 text-xl font-bold text-gray-800">테이블 간 데이터 관계 설정</h2>

            {/* 테이블 선택기 */}
            <TableSelector
              companyCode={companyCode}
              onTableAdd={addTableNode}
              selectedTables={getSelectedTableNames()}
            />

            {/* 컨트롤 버튼들 */}
            <div className="space-y-3">
              <button
                onClick={addSampleNode}
                className="w-full rounded-lg bg-gray-500 p-3 font-medium text-white transition-colors hover:bg-gray-600"
              >
                + 샘플 테이블 추가 (개발용)
              </button>

              <button
                onClick={clearNodes}
                className="w-full rounded-lg bg-red-500 p-3 font-medium text-white transition-colors hover:bg-red-600"
              >
                전체 삭제
              </button>

              <button
                onClick={() => onSave && onSave([])}
                className="w-full rounded-lg bg-green-500 p-3 font-medium text-white transition-colors hover:bg-green-600"
              >
                저장
              </button>
            </div>

            {/* 통계 정보 */}
            <div className="mt-6 rounded-lg bg-gray-50 p-4">
              <div className="mb-2 text-sm font-semibold text-gray-700">통계</div>
              <div className="space-y-1 text-sm text-gray-600">
                <div className="flex justify-between">
                  <span>테이블 노드:</span>
                  <span className="font-medium">{nodes.length}개</span>
                </div>
                <div className="flex justify-between">
                  <span>연결:</span>
                  <span className="font-medium">{edges.length}개</span>
                </div>
              </div>
            </div>

            {/* 선택된 컬럼 정보 */}
            {Object.keys(selectedColumns).length > 0 && (
              <div className="mt-6 space-y-4">
                <div className="rounded-lg border border-blue-200 bg-blue-50 p-4">
                  <div className="mb-3 text-sm font-semibold text-blue-800">선택된 컬럼</div>
                  <div className="space-y-3">
                    {[...new Set(selectionOrder)]
                      .filter((tableName) => selectedColumns[tableName] && selectedColumns[tableName].length > 0)
                      .map((tableName, index, filteredOrder) => {
                        const columns = selectedColumns[tableName];
                        const node = nodes.find((n) => n.data.table.tableName === tableName);
                        const displayName = node?.data.table.displayName || tableName;

                        return (
                          <div key={`selected-${tableName}-${index}`}>
                            <div className="w-full min-w-0 rounded-lg border border-blue-300 bg-white p-3">
                              <div className="mb-2 flex flex-wrap items-center gap-2">
                                <div className="flex-shrink-0 rounded px-2 py-1 text-xs font-medium text-blue-600">
                                  {displayName}
                                </div>
                              </div>
                              <div className="flex w-full min-w-0 flex-wrap gap-1">
                                {columns.map((column, columnIndex) => (
                                  <div
                                    key={`${tableName}-${column}-${columnIndex}`}
                                    className="max-w-full truncate rounded-full border border-blue-200 bg-blue-100 px-2 py-1 text-xs text-blue-800"
                                    title={column}
                                  >
                                    {column}
                                  </div>
                                ))}
                              </div>
                            </div>
                            {/* 첫 번째 테이블 다음에 화살표 표시 */}
                            {index === 0 && filteredOrder.length > 1 && (
                              <div className="flex justify-center py-2">
                                <div className="text-gray-400">↓</div>
                              </div>
                            )}
                          </div>
                        );
                      })}
                  </div>
                  <div className="mt-3 flex gap-2">
                    <button
                      onClick={openConnectionModal}
                      disabled={!canCreateConnection()}
                      className={`w-full rounded px-3 py-1 text-xs font-medium transition-colors ${
                        canCreateConnection()
                          ? "cursor-pointer bg-blue-600 text-white hover:bg-blue-700"
                          : "cursor-not-allowed bg-gray-300 text-gray-500"
                      }`}
                    >
                      컬럼 연결 설정
                    </button>
                    <button
                      onClick={() => {
                        setSelectedColumns({});
                        setSelectionOrder([]);
                      }}
                      className="w-full cursor-pointer rounded bg-gray-200 px-3 py-1 text-xs font-medium text-gray-600 hover:bg-gray-300"
                    >
                      선택 초기화
                    </button>
                  </div>
                </div>
              </div>
            )}
          </div>
        </div>

        {/* React Flow 캔버스 */}
        <div className="relative flex-1">
          <ReactFlow
            nodes={nodes}
            edges={edges}
            onNodesChange={onNodesChange}
            onEdgesChange={onEdgesChange}
            onConnect={onConnect}
            onSelectionChange={onSelectionChange}
            nodeTypes={nodeTypes}
            edgeTypes={edgeTypes}
            fitView
            attributionPosition="bottom-left"
            panOnScroll={false}
            zoomOnScroll={true}
            zoomOnPinch={true}
            panOnDrag={[1, 2]}
            selectionOnDrag={true}
            multiSelectionKeyCode={null}
            selectNodesOnDrag={false}
            selectionMode={SelectionMode.Partial}
          >
            <Controls />

            <Background variant={BackgroundVariant.Dots} gap={20} size={1} color="#E5E7EB" />
          </ReactFlow>

          {/* 안내 메시지 */}
          {nodes.length === 0 && (
            <div className="pointer-events-none absolute inset-0 flex items-center justify-center">
              <div className="text-center text-gray-500">
                <div className="mb-2 text-2xl">📊</div>
                <div className="mb-1 text-lg font-medium">테이블 간 데이터 관계 설정을 시작하세요</div>
                <div className="text-sm">
                  <div>왼쪽 사이드바에서 테이블을 더블클릭하여 추가하세요</div>
                  <div className="mt-1 text-xs text-gray-400">테이블 선택 후 Del 키로 삭제 가능</div>
                </div>
              </div>
            </div>
          )}
        </div>
      </div>

      {/* 연결 설정 모달 */}
      <ConnectionSetupModal
        isOpen={!!pendingConnection}
        connection={pendingConnection}
        companyCode={companyCode}
        onConfirm={handleConfirmConnection}
        onCancel={handleCancelConnection}
      />
    </div>
  );
};