"use client";

import { useState, useEffect } from "react";
import { Button } from "@/components/ui/button";
import { Input } from "@/components/ui/input";
import { Badge } from "@/components/ui/badge";
import { LoadingSpinner } from "@/components/common/LoadingSpinner";
import { useCommonCode } from "@/hooks/useCommonCode";
// import { useMultiLang } from "@/hooks/useMultiLang"; // 무한 루프 방지를 위해 임시 제거
import { CodeFormModal } from "./CodeFormModal";
import { AlertModal } from "@/components/common/AlertModal";
import { Search, Plus, Edit, Trash2, GripVertical } from "lucide-react";
import { cn } from "@/lib/utils";
import {
  DndContext,
  closestCenter,
  KeyboardSensor,
  PointerSensor,
  useSensor,
  useSensors,
  DragEndEvent,
} from "@dnd-kit/core";
import {
  arrayMove,
  SortableContext,
  sortableKeyboardCoordinates,
  verticalListSortingStrategy,
} from "@dnd-kit/sortable";
import { useSortable } from "@dnd-kit/sortable";
import { CSS } from "@dnd-kit/utilities";

interface CodeDetailPanelProps {
  categoryCode: string;
}

// 드래그 가능한 코드 아이템 컴포넌트
interface SortableCodeItemProps {
  code: any;
  onEdit: (code: any) => void;
  onDelete: (code: any) => void;
}

function SortableCodeItem({ code, onEdit, onDelete }: SortableCodeItemProps) {
  const { attributes, listeners, setNodeRef, transform, transition, isDragging } = useSortable({
    id: `${code.code_category}-${code.code_value}`,
  });

  const style = {
    transform: CSS.Transform.toString(transform),
    transition,
  };

  return (
    <div
      ref={setNodeRef}
      style={style}
      className={cn(
        "group flex items-center justify-between rounded-lg p-3 transition-colors",
        isDragging ? "border-2 border-blue-200 bg-blue-50 opacity-50 shadow-lg" : "hover:bg-muted",
      )}
      {...attributes}
    >
      {/* 드래그 핸들 */}
      <div className="mr-2 cursor-grab text-gray-400 hover:text-gray-600 active:cursor-grabbing" {...listeners}>
        <GripVertical className="h-4 w-4" />
      </div>

      <div className="min-w-0 flex-1">
        <div className="mb-1 flex items-center gap-2">
          <span className="text-sm font-medium">{code.code_name}</span>
          {code.is_active === "Y" ? (
            <Badge variant="secondary" className="text-xs">
              활성
            </Badge>
          ) : (
            <Badge variant="outline" className="text-xs">
              비활성
            </Badge>
          )}
        </div>
        <div className="text-muted-foreground flex items-center gap-2 text-xs">
          <span className="font-mono">{code.code_value}</span>
          {code.code_name_eng && <span>({code.code_name_eng})</span>}
        </div>
        {code.description && <p className="text-muted-foreground mt-1 text-xs">{code.description}</p>}
      </div>

      <div className="flex gap-1">
        <Button
          size="sm"
          variant="ghost"
          onClick={() => onEdit(code)}
          className="opacity-0 transition-opacity group-hover:opacity-100"
        >
          <Edit className="h-3 w-3" />
        </Button>
        <Button
          size="sm"
          variant="ghost"
          onClick={() => onDelete(code)}
          className="text-red-600 opacity-0 transition-opacity group-hover:opacity-100 hover:text-red-700"
        >
          <Trash2 className="h-3 w-3" />
        </Button>
      </div>
    </div>
  );
}

export function CodeDetailPanel({ categoryCode }: CodeDetailPanelProps) {
  // const { getText } = useMultiLang(); // 무한 루프 방지를 위해 임시 제거
  const { codes, setCodes, codesLoading, codesError, fetchCodes, deleteCode, reorderCodes } = useCommonCode();

  // 드래그앤드롭 센서 설정
  const sensors = useSensors(
    useSensor(PointerSensor),
    useSensor(KeyboardSensor, {
      coordinateGetter: sortableKeyboardCoordinates,
    }),
  );

  // 카테고리 변경 시 코드 조회
  useEffect(() => {
    if (categoryCode) {
      console.log("🔍 카테고리 변경됨, 코드 조회:", categoryCode);
      fetchCodes(categoryCode);
    }
  }, [categoryCode, fetchCodes]);

  // 로컬 상태
  const [searchTerm, setSearchTerm] = useState("");
  const [showActiveOnly, setShowActiveOnly] = useState(false); // 활성 필터 상태
  const [showFormModal, setShowFormModal] = useState(false);
  const [editingCode, setEditingCode] = useState<{ categoryCode: string; codeValue: string }>({
    categoryCode: "",
    codeValue: "",
  });
  const [showDeleteModal, setShowDeleteModal] = useState(false);
  const [deletingCode, setDeletingCode] = useState<{ categoryCode: string; codeValue: string }>({
    categoryCode: "",
    codeValue: "",
  });

  // 검색 및 활성 상태 필터링
  const filteredCodes = codes.filter((code) => {
    // 검색 조건
    const matchesSearch =
      code.code_name.toLowerCase().includes(searchTerm.toLowerCase()) ||
      code.code_value.toLowerCase().includes(searchTerm.toLowerCase());

    // 활성 상태 필터 조건
    const matchesActiveFilter = showActiveOnly ? code.is_active : true;

    return matchesSearch && matchesActiveFilter;
  });

  // 코드 생성 핸들러
  const handleCreateCode = () => {
    if (!categoryCode) return;

    setEditingCode({ categoryCode: "", codeValue: "" });
    setShowFormModal(true);
  };

  // 코드 수정 핸들러
  const handleEditCode = (codeValue: string) => {
    setEditingCode({ categoryCode, codeValue });
    setShowFormModal(true);
  };

  // 코드 삭제 핸들러
  const handleDeleteCode = (codeValue: string) => {
    setDeletingCode({ categoryCode, codeValue });
    setShowDeleteModal(true);
  };

  // 삭제 확인 핸들러
  const handleConfirmDelete = async () => {
    if (!deletingCode.categoryCode || !deletingCode.codeValue) return;

    try {
      await deleteCode(deletingCode.categoryCode, deletingCode.codeValue);
      setShowDeleteModal(false);
      setDeletingCode({ categoryCode: "", codeValue: "" });
    } catch (error) {
      console.error("코드 삭제 오류:", error);
      // 에러 처리는 useCommonCode 훅에서 처리됨
    }
  };

  // 드래그 종료 핸들러
  const handleDragEnd = async (event: DragEndEvent) => {
    const { active, over } = event;

    if (!over || active.id === over.id) {
      return;
    }

    const activeIndex = filteredCodes.findIndex((code) => `${code.code_category}-${code.code_value}` === active.id);
    const overIndex = filteredCodes.findIndex((code) => `${code.code_category}-${code.code_value}` === over.id);

    if (activeIndex !== overIndex) {
      // 전체 codes 배열에서 현재 카테고리의 코드들을 찾아서 재정렬
      const currentCategoryCodes = codes.filter((code) => code.code_category === categoryCode);
      const otherCategoryCodes = codes.filter((code) => code.code_category !== categoryCode);

      // 현재 카테고리 코드들의 순서를 변경
      const reorderedCategoryCodes = arrayMove(currentCategoryCodes, activeIndex, overIndex);

      // 전체 codes 배열 업데이트
      const newCodesArray = [...otherCategoryCodes, ...reorderedCategoryCodes];
      setCodes(newCodesArray);

      try {
        // 서버에 순서 변경 요청
        console.log("🔄 코드 순서 변경:", {
          categoryCode,
          from: activeIndex,
          to: overIndex,
          reorderedCodes: reorderedCategoryCodes.map((code) => code.code_value),
        });

        // 백엔드 API 호출 - 실제 DB에 순서 저장
        await reorderCodes(
          categoryCode,
          reorderedCategoryCodes.map((code, index) => ({
            codeValue: code.code_value,
            sortOrder: index + 1,
          })),
        );
      } catch (error) {
        console.error("순서 변경 실패:", error);
        // 실패 시 원래 순서로 복원
        fetchCodes(categoryCode);
      }
    }
  };

  // 카테고리가 선택되지 않은 경우
  if (!categoryCode) {
    return (
      <div className="text-muted-foreground flex h-64 items-center justify-center">
        <div className="text-center">
          <p className="mb-2 text-lg font-medium">카테고리를 선택하세요</p>
          <p className="text-sm">왼쪽에서 카테고리를 선택하면 해당 코드 목록이 표시됩니다.</p>
        </div>
      </div>
    );
  }

  // 에러 상태
  if (codesError) {
    return (
      <div className="p-4 text-center text-red-600">
        <p className="mb-2">❌ {codesError}</p>
        <Button onClick={() => fetchCodes(categoryCode)} variant="outline" size="sm">
          다시 시도
        </Button>
      </div>
    );
  }

  return (
    <div className="space-y-4">
      {/* 검색 및 추가 버튼 */}
      <div className="space-y-3 border-b p-4">
        <div className="flex gap-2">
          <div className="relative flex-1">
            <Search className="absolute top-1/2 left-3 h-4 w-4 -translate-y-1/2 transform text-gray-400" />
            <Input
              placeholder="코드 검색..."
              value={searchTerm}
              onChange={(e) => setSearchTerm(e.target.value)}
              className="pl-10"
            />
          </div>
        </div>

        {/* 활성 상태 필터 토글 */}
        <div className="flex items-center gap-2">
          <label className="flex cursor-pointer items-center gap-2 text-sm">
            <input
              type="checkbox"
              checked={showActiveOnly}
              onChange={(e) => setShowActiveOnly(e.target.checked)}
              className="h-4 w-4 rounded border-gray-300 bg-gray-100 text-blue-600 focus:ring-2 focus:ring-blue-500"
            />
            활성 코드만 표시
          </label>
        </div>

        <Button onClick={handleCreateCode} className="w-full" size="sm">
          <Plus className="mr-2 h-4 w-4" />새 코드
        </Button>
      </div>

      {/* 코드 목록 (드래그앤드롭) */}
      <div className="max-h-96 overflow-y-auto">
        {codesLoading ? (
          <div className="p-4 text-center">
            <LoadingSpinner size="sm" />
            <p className="text-muted-foreground mt-2 text-sm">코드를 불러오는 중...</p>
          </div>
        ) : filteredCodes.length === 0 ? (
          <div className="text-muted-foreground p-4 text-center">
            <p>코드가 없습니다.</p>
          </div>
        ) : (
          <DndContext sensors={sensors} collisionDetection={closestCenter} onDragEnd={handleDragEnd}>
            <SortableContext
              items={filteredCodes.map((code) => `${code.code_category}-${code.code_value}`)}
              strategy={verticalListSortingStrategy}
            >
              <div className="space-y-1">
                {filteredCodes.map((code) => (
                  <SortableCodeItem
                    key={`${code.code_category}-${code.code_value}`}
                    code={code}
                    onEdit={(code) => handleEditCode(code.code_value)}
                    onDelete={(code) => handleDeleteCode(code.code_value)}
                  />
                ))}
              </div>
            </SortableContext>
          </DndContext>
        )}
      </div>

      {/* 코드 폼 모달 */}
      {showFormModal && (
        <CodeFormModal
          isOpen={showFormModal}
          onClose={() => setShowFormModal(false)}
          categoryCode={categoryCode}
          editingCodeValue={editingCode.codeValue}
        />
      )}

      {/* 삭제 확인 모달 */}
      {showDeleteModal && (
        <AlertModal
          isOpen={showDeleteModal}
          onClose={() => setShowDeleteModal(false)}
          onConfirm={handleConfirmDelete}
          title="삭제 확인"
          message="이 코드를 삭제하시겠습니까?"
          confirmText="삭제"
          cancelText="취소"
          variant="destructive"
        />
      )}
    </div>
  );
}