"use client";

/**
 * 데이터 변환 노드 속성 편집 (개선 버전)
 */

import { useEffect, useState } from "react";
import { Plus, Trash2, Wand2, ArrowRight } from "lucide-react";
import { Label } from "@/components/ui/label";
import { Input } from "@/components/ui/input";
import { Button } from "@/components/ui/button";
import { ScrollArea } from "@/components/ui/scroll-area";
import { Select, SelectContent, SelectItem, SelectTrigger, SelectValue } from "@/components/ui/select";
import { useFlowEditorStore } from "@/lib/stores/flowEditorStore";
import type { DataTransformNodeData } from "@/types/node-editor";

interface DataTransformPropertiesProps {
  nodeId: string;
  data: DataTransformNodeData;
}

const TRANSFORM_TYPES = [
  { value: "UPPERCASE", label: "대문자 변환", category: "기본" },
  { value: "LOWERCASE", label: "소문자 변환", category: "기본" },
  { value: "TRIM", label: "공백 제거", category: "기본" },
  { value: "CONCAT", label: "문자열 결합", category: "기본" },
  { value: "SPLIT", label: "문자열 분리", category: "기본" },
  { value: "REPLACE", label: "문자열 치환", category: "기본" },
  { value: "EXPLODE", label: "행 확장 (1→N)", category: "고급" },
  { value: "CAST", label: "타입 변환", category: "고급" },
  { value: "FORMAT", label: "형식화", category: "고급" },
  { value: "CALCULATE", label: "계산식", category: "고급" },
  { value: "JSON_EXTRACT", label: "JSON 추출", category: "고급" },
  { value: "CUSTOM", label: "사용자 정의", category: "고급" },
] as const;

export function DataTransformProperties({ nodeId, data }: DataTransformPropertiesProps) {
  const { updateNode, nodes, edges } = useFlowEditorStore();

  const [displayName, setDisplayName] = useState(data.displayName || "데이터 변환");
  const [transformations, setTransformations] = useState(data.transformations || []);

  // 소스 필드 목록 (연결된 입력 노드에서 가져오기)
  const [sourceFields, setSourceFields] = useState<Array<{ name: string; label?: string }>>([]);

  // 데이터 변경 시 로컬 상태 업데이트
  useEffect(() => {
    setDisplayName(data.displayName || "데이터 변환");
    setTransformations(data.transformations || []);
  }, [data]);

  // 연결된 소스 노드에서 필드 가져오기
  useEffect(() => {
    const inputEdges = edges.filter((edge) => edge.target === nodeId);
    const sourceNodeIds = inputEdges.map((edge) => edge.source);
    const sourceNodes = nodes.filter((node) => sourceNodeIds.includes(node.id));

    const fields: Array<{ name: string; label?: string }> = [];
    sourceNodes.forEach((node) => {
      if (node.type === "tableSource" && node.data.fields) {
        node.data.fields.forEach((field: any) => {
          fields.push({
            name: field.name,
            label: field.label || field.displayName,
          });
        });
      } else if (node.type === "externalDBSource" && node.data.fields) {
        node.data.fields.forEach((field: any) => {
          fields.push({
            name: field.name,
            label: field.label || field.displayName,
          });
        });
      }
    });

    setSourceFields(fields);
  }, [nodeId, nodes, edges]);

  const handleAddTransformation = () => {
    setTransformations([
      ...transformations,
      {
        type: "UPPERCASE" as const,
        sourceField: "",
        targetField: "",
      },
    ]);
  };

  const handleRemoveTransformation = (index: number) => {
    const newTransformations = transformations.filter((_, i) => i !== index);
    setTransformations(newTransformations);

    // 즉시 반영
    updateNode(nodeId, {
      displayName,
      transformations: newTransformations,
    });
  };

  const handleTransformationChange = (index: number, field: string, value: any) => {
    const newTransformations = [...transformations];

    // 필드 변경 시 라벨도 함께 저장
    if (field === "sourceField") {
      const sourceField = sourceFields.find((f) => f.name === value);
      newTransformations[index] = {
        ...newTransformations[index],
        sourceField: value,
        sourceFieldLabel: sourceField?.label,
      };
    } else if (field === "targetField") {
      // 타겟 필드는 새로 생성하는 필드이므로 라벨은 사용자가 직접 입력
      newTransformations[index] = {
        ...newTransformations[index],
        targetField: value,
      };
    } else {
      newTransformations[index] = { ...newTransformations[index], [field]: value };
    }

    setTransformations(newTransformations);
  };

  const handleSave = () => {
    updateNode(nodeId, {
      displayName,
      transformations,
    });
  };

  const renderTransformationFields = (transform: any, index: number) => {
    const commonFields = (
      <>
        {/* 소스 필드 */}
        {transform.type !== "CONCAT" && (
          <div>
            <Label className="text-xs text-gray-600">소스 필드</Label>
            <Select
              value={transform.sourceField || ""}
              onValueChange={(value) => handleTransformationChange(index, "sourceField", value)}
            >
              <SelectTrigger className="mt-1 h-8 text-xs">
                <SelectValue placeholder="소스 필드 선택" />
              </SelectTrigger>
              <SelectContent>
                {sourceFields.length === 0 ? (
                  <div className="p-2 text-center text-xs text-gray-400">연결된 소스 노드가 없습니다</div>
                ) : (
                  sourceFields.map((field) => (
                    <SelectItem key={field.name} value={field.name} className="text-xs">
                      <div className="flex items-center justify-between gap-2">
                        <span className="font-medium">{field.label || field.name}</span>
                        {field.label && field.label !== field.name && (
                          <span className="text-muted-foreground font-mono text-xs">{field.name}</span>
                        )}
                      </div>
                    </SelectItem>
                  ))
                )}
              </SelectContent>
            </Select>
          </div>
        )}

        {/* 타겟 필드 */}
        <div>
          <Label className="text-xs text-gray-600">타겟 필드명 (선택)</Label>
          <Input
            value={transform.targetField || ""}
            onChange={(e) => handleTransformationChange(index, "targetField", e.target.value)}
            placeholder="비어있으면 소스 필드에 적용"
            className="mt-1 h-8 text-xs"
          />
          <p className="mt-1 text-xs text-gray-400">
            {transform.targetField ? (
              transform.targetField === transform.sourceField ? (
                <span className="text-indigo-600">✓ 소스 필드를 덮어씁니다</span>
              ) : (
                <span className="text-green-600">✓ 새 필드를 생성합니다</span>
              )
            ) : (
              <span className="text-indigo-600">비어있음: 소스 필드를 덮어씁니다</span>
            )}
          </p>
        </div>
      </>
    );

    // 타입별 추가 필드
    switch (transform.type) {
      case "EXPLODE":
        return (
          <>
            {commonFields}
            <div>
              <Label className="text-xs text-gray-600">구분자</Label>
              <Input
                value={transform.delimiter || ","}
                onChange={(e) => handleTransformationChange(index, "delimiter", e.target.value)}
                placeholder="예: , 또는 ; 또는 |"
                className="mt-1 h-8 text-xs"
              />
              <p className="mt-1 text-xs text-gray-400">이 문자로 분리하여 여러 행으로 확장합니다</p>
            </div>
          </>
        );

      case "CONCAT":
        return (
          <>
            {/* CONCAT은 다중 소스 필드를 지원 - 간소화 버전 */}
            <div>
              <Label className="text-xs text-gray-600">첫 번째 필드</Label>
              <Select
                value={transform.sourceField || ""}
                onValueChange={(value) => handleTransformationChange(index, "sourceField", value)}
              >
                <SelectTrigger className="mt-1 h-8 text-xs">
                  <SelectValue placeholder="첫 번째 필드 선택" />
                </SelectTrigger>
                <SelectContent>
                  {sourceFields.map((field) => (
                    <SelectItem key={field.name} value={field.name} className="text-xs">
                      {field.label || field.name}
                    </SelectItem>
                  ))}
                </SelectContent>
              </Select>
            </div>
            <div>
              <Label className="text-xs text-gray-600">구분자</Label>
              <Input
                value={transform.separator || " "}
                onChange={(e) => handleTransformationChange(index, "separator", e.target.value)}
                placeholder="예: 공백 또는 , 또는 -"
                className="mt-1 h-8 text-xs"
              />
            </div>
            {commonFields}
          </>
        );

      case "SPLIT":
        return (
          <>
            {commonFields}
            <div>
              <Label className="text-xs text-gray-600">구분자</Label>
              <Input
                value={transform.delimiter || ","}
                onChange={(e) => handleTransformationChange(index, "delimiter", e.target.value)}
                placeholder="예: , 또는 ; 또는 |"
                className="mt-1 h-8 text-xs"
              />
            </div>
            <div>
              <Label className="text-xs text-gray-600">인덱스 (0부터 시작)</Label>
              <Input
                type="number"
                value={transform.splitIndex !== undefined ? transform.splitIndex : 0}
                onChange={(e) => handleTransformationChange(index, "splitIndex", parseInt(e.target.value))}
                placeholder="0"
                className="mt-1 h-8 text-xs"
              />
              <p className="mt-1 text-xs text-gray-400">분리된 값 중 몇 번째를 가져올지 지정 (0=첫번째)</p>
            </div>
          </>
        );

      case "REPLACE":
        return (
          <>
            {commonFields}
            <div>
              <Label className="text-xs text-gray-600">찾을 문자열</Label>
              <Input
                value={transform.searchValue || ""}
                onChange={(e) => handleTransformationChange(index, "searchValue", e.target.value)}
                placeholder="예: old"
                className="mt-1 h-8 text-xs"
              />
            </div>
            <div>
              <Label className="text-xs text-gray-600">바꿀 문자열</Label>
              <Input
                value={transform.replaceValue || ""}
                onChange={(e) => handleTransformationChange(index, "replaceValue", e.target.value)}
                placeholder="예: new"
                className="mt-1 h-8 text-xs"
              />
            </div>
          </>
        );

      case "CAST":
        return (
          <>
            {commonFields}
            <div>
              <Label className="text-xs text-gray-600">변환할 타입</Label>
              <Select
                value={transform.castType || "string"}
                onValueChange={(value) => handleTransformationChange(index, "castType", value)}
              >
                <SelectTrigger className="mt-1 h-8 text-xs">
                  <SelectValue />
                </SelectTrigger>
                <SelectContent>
                  <SelectItem value="string" className="text-xs">
                    문자열 (String)
                  </SelectItem>
                  <SelectItem value="number" className="text-xs">
                    숫자 (Number)
                  </SelectItem>
                  <SelectItem value="boolean" className="text-xs">
                    불린 (Boolean)
                  </SelectItem>
                  <SelectItem value="date" className="text-xs">
                    날짜 (Date)
                  </SelectItem>
                </SelectContent>
              </Select>
            </div>
          </>
        );

      case "CALCULATE":
      case "FORMAT":
      case "JSON_EXTRACT":
      case "CUSTOM":
        return (
          <>
            {commonFields}
            <div>
              <Label className="text-xs text-gray-600">표현식</Label>
              <Input
                value={transform.expression || ""}
                onChange={(e) => handleTransformationChange(index, "expression", e.target.value)}
                placeholder="예: field1 + field2"
                className="mt-1 h-8 text-xs"
              />
              <p className="mt-1 text-xs text-gray-400">
                {transform.type === "CALCULATE" && "계산 수식을 입력하세요 (예: field1 + field2)"}
                {transform.type === "FORMAT" && "형식 문자열을 입력하세요 (예: {0}-{1})"}
                {transform.type === "JSON_EXTRACT" && "JSON 경로를 입력하세요 (예: $.data.name)"}
                {transform.type === "CUSTOM" && "JavaScript 표현식을 입력하세요"}
              </p>
            </div>
          </>
        );

      default:
        // UPPERCASE, LOWERCASE, TRIM 등
        return commonFields;
    }
  };

  return (
    <ScrollArea className="h-full">
      <div className="space-y-4 p-4">
        {/* 헤더 */}
        <div className="flex items-center gap-2 rounded-md bg-indigo-50 p-2">
          <Wand2 className="h-4 w-4 text-indigo-600" />
          <span className="font-semibold text-indigo-600">데이터 변환</span>
        </div>

        {/* 기본 정보 */}
        <div>
          <h3 className="mb-3 text-sm font-semibold">기본 정보</h3>
          <div>
            <Label htmlFor="displayName" className="text-xs">
              표시 이름
            </Label>
            <Input
              id="displayName"
              value={displayName}
              onChange={(e) => setDisplayName(e.target.value)}
              className="mt-1"
              placeholder="노드 표시 이름"
            />
          </div>
        </div>

        {/* 변환 규칙 */}
        <div>
          <div className="mb-2 flex items-center justify-between">
            <div>
              <h3 className="text-sm font-semibold">변환 규칙</h3>
              <p className="text-xs text-gray-500">데이터를 변환할 규칙을 추가하세요</p>
            </div>
            <Button size="sm" variant="outline" onClick={handleAddTransformation} className="h-7 px-2 text-xs">
              <Plus className="mr-1 h-3 w-3" />
              규칙 추가
            </Button>
          </div>

          {transformations.length === 0 ? (
            <div className="rounded border border-dashed bg-gray-50 p-4 text-center text-xs text-gray-500">
              변환 규칙을 추가하세요
            </div>
          ) : (
            <div className="space-y-3">
              {transformations.map((transform, index) => (
                <div key={index} className="rounded border bg-indigo-50 p-3">
                  <div className="mb-2 flex items-center justify-between">
                    <span className="text-xs font-medium text-indigo-700">변환 #{index + 1}</span>
                    <Button
                      size="sm"
                      variant="ghost"
                      onClick={() => handleRemoveTransformation(index)}
                      className="h-6 w-6 p-0 text-red-600 hover:text-red-700"
                    >
                      <Trash2 className="h-3 w-3" />
                    </Button>
                  </div>

                  <div className="space-y-2">
                    {/* 변환 타입 선택 */}
                    <div>
                      <Label className="text-xs text-gray-600">변환 타입</Label>
                      <Select
                        value={transform.type}
                        onValueChange={(value) => handleTransformationChange(index, "type", value)}
                      >
                        <SelectTrigger className="mt-1 h-8 text-xs">
                          <SelectValue />
                        </SelectTrigger>
                        <SelectContent>
                          <div className="px-2 py-1 text-xs font-semibold text-gray-500">기본 변환</div>
                          {TRANSFORM_TYPES.filter((t) => t.category === "기본").map((type) => (
                            <SelectItem key={type.value} value={type.value} className="text-xs">
                              {type.label}
                            </SelectItem>
                          ))}
                          <div className="px-2 py-1 text-xs font-semibold text-gray-500">고급 변환</div>
                          {TRANSFORM_TYPES.filter((t) => t.category === "고급").map((type) => (
                            <SelectItem key={type.value} value={type.value} className="text-xs">
                              {type.label}
                            </SelectItem>
                          ))}
                        </SelectContent>
                      </Select>
                    </div>

                    {/* 타입별 필드 렌더링 */}
                    {renderTransformationFields(transform, index)}
                  </div>
                </div>
              ))}
            </div>
          )}
        </div>

        {/* 적용 버튼 */}
        <div className="sticky bottom-0 border-t bg-white pt-3">
          <Button onClick={handleSave} className="w-full" size="sm">
            적용
          </Button>
          <p className="mt-2 text-center text-xs text-gray-500">✅ 변경 사항이 즉시 노드에 반영됩니다.</p>
        </div>
      </div>
    </ScrollArea>
  );
}