"use client";

import React, { useState, useCallback } from "react";
import {
  ReactFlow,
  Node,
  Edge,
  Controls,
  Background,
  MiniMap,
  useNodesState,
  useEdgesState,
  addEdge,
  Connection,
} from "@xyflow/react";
import "@xyflow/react/dist/style.css";
import { ScreenNode } from "./ScreenNode";
import { CustomEdge } from "./CustomEdge";

// 노드 및 엣지 타입 정의
const nodeTypes = {
  screenNode: ScreenNode,
};

const edgeTypes = {
  customEdge: CustomEdge,
};

interface DataFlowDesignerProps {
  companyCode: string;
  onSave?: (relationships: any[]) => void;
}

export const DataFlowDesigner: React.FC<DataFlowDesignerProps> = ({ companyCode, onSave }) => {
  const [nodes, setNodes, onNodesChange] = useNodesState([]);
  const [edges, setEdges, onEdgesChange] = useEdgesState([]);
  const [selectedField, setSelectedField] = useState<{
    screenId: string;
    fieldName: string;
  } | null>(null);

  // 노드 연결 처리
  const onConnect = useCallback(
    (params: Connection) => {
      const newEdge = {
        ...params,
        type: "customEdge",
        data: {
          relationshipType: "one-to-one",
          connectionType: "simple-key",
          label: "1:1 연결",
        },
      };
      setEdges((eds) => addEdge(newEdge, eds));
    },
    [setEdges],
  );

  // 필드 클릭 처리
  const handleFieldClick = useCallback((screenId: string, fieldName: string) => {
    setSelectedField({ screenId, fieldName });
  }, []);

  // 샘플 화면 노드 추가
  const addSampleNode = useCallback(() => {
    const newNode: Node = {
      id: `screen-${Date.now()}`,
      type: "screenNode",
      position: { x: Math.random() * 300, y: Math.random() * 200 },
      data: {
        screen: {
          screenId: `screen-${Date.now()}`,
          screenName: `샘플 화면 ${nodes.length + 1}`,
          screenCode: `SCREEN${nodes.length + 1}`,
          tableName: `table_${nodes.length + 1}`,
          fields: [
            { 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" },
          ],
        },
        onFieldClick: handleFieldClick,
      },
    };

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

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

  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">데이터 흐름 관리</h2>

            {/* 회사 정보 */}
            <div className="mb-6 rounded-lg bg-blue-50 p-4">
              <div className="text-sm font-medium text-blue-600">회사 코드</div>
              <div className="text-lg font-bold text-blue-800">{companyCode}</div>
            </div>

            {/* 컨트롤 버튼들 */}
            <div className="space-y-3">
              <button
                onClick={addSampleNode}
                className="w-full rounded-lg bg-blue-500 p-3 font-medium text-white transition-colors hover:bg-blue-600"
              >
                + 샘플 화면 추가
              </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>화면 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 필드 정보 */}
            {selectedField && (
              <div className="mt-6 rounded-lg border border-yellow-200 bg-yellow-50 p-4">
                <div className="mb-2 text-sm font-semibold text-yellow-800">선택된 필드</div>
                <div className="text-sm text-yellow-700">
                  <div>화면: {selectedField.screenId}</div>
                  <div>필드: {selectedField.fieldName}</div>
                </div>
                <button
                  onClick={() => setSelectedField(null)}
                  className="mt-2 text-xs text-yellow-600 hover:text-yellow-800"
                >
                  선택 해제
                </button>
              </div>
            )}
          </div>
        </div>

        {/* React Flow 캔버스 */}
        <div className="relative flex-1">
          <ReactFlow
            nodes={nodes}
            edges={edges}
            onNodesChange={onNodesChange}
            onEdgesChange={onEdgesChange}
            onConnect={onConnect}
            nodeTypes={nodeTypes}
            edgeTypes={edgeTypes}
            fitView
            attributionPosition="bottom-left"
          >
            <Controls />
            <MiniMap
              nodeColor={(node) => {
                switch (node.type) {
                  case "screenNode":
                    return "#3B82F6";
                  default:
                    return "#6B7280";
                }
              }}
            />
            <Background variant="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">데이터 흐름 설계를 시작하세요</div>
                <div className="text-sm">왼쪽 사이드바에서 "샘플 화면 추가" 버튼을 클릭하세요</div>
              </div>
            </div>
          )}
        </div>
      </div>
    </div>
  );
};