"use client";

import React, { useState, useCallback } from "react";
import { Button } from "@/components/ui/button";
import { Input } from "@/components/ui/input";
import { Badge } from "@/components/ui/badge";
import { Checkbox } from "@/components/ui/checkbox";
import {
  Dialog,
  DialogContent,
  DialogDescription,
  DialogFooter,
  DialogHeader,
  DialogTitle,
  DialogTrigger,
} from "@/components/ui/dialog";
import {
  Table,
  TableBody,
  TableCell,
  TableHead,
  TableHeader,
  TableRow,
} from "@/components/ui/table";
import { Search, X, ChevronLeft, ChevronRight } from "lucide-react";
import { useDebounce } from "@/hooks/use-debounce";
import { searchMaterialsForDialog, MaterialSearchItem } from "./material-service";

/**
 * 자재 단일 선택 Dialog 컴포넌트
 *
 * @description
 * - TanStack Table을 사용한 효율적인 자재 선택 Dialog
 * - 페이지네이션으로 데이터를 조회하고 클라이언트 사이드에서 검색 필터링
 * - 버튼 클릭 시 Dialog가 열리고, 자재를 선택하면 Dialog가 닫히며 결과를 반환
 *
 * @MaterialSearchItem_Structure
 * 상태에서 관리되는 자재 객체의 형태:
 * ```typescript
 * interface MaterialSearchItem {
 *   materialCode: string;        // 자재코드 (MATNR)
 *   materialName: string;        // 자재명 (ZZNAME)
 *   displayText: string;         // 표시용 텍스트 (code + " - " + name)
 * }
 * ```
 *
 * @state
 * - open: Dialog 열림/닫힘 상태
 * - selectedMaterial: 현재 선택된 자재 (단일)
 * - tempSelectedMaterial: Dialog 내에서 임시로 선택된 자재 (확인 버튼 클릭 전까지)
 * - searchQuery: 검색어
 * - currentPage: 현재 페이지
 * - searchResults: 검색 결과
 * - isSearching: 검색 중 상태
 * - error: 에러 상태
 *
 * @callback
 * - onMaterialSelect: 자재 선택 완료 시 호출되는 콜백
 *   - 매개변수: MaterialSearchItem | null
 *   - 선택된 자재 정보 또는 null (선택 해제 시)
 *
 * @usage
 * ```tsx
 * <MaterialSelectorDialogSingle
 *   triggerLabel="자재 선택"
 *   selectedMaterial={selectedMaterial}
 *   onMaterialSelect={(material) => {
 *     setSelectedMaterial(material);
 *     console.log('선택된 자재:', material);
 *   }}
 *   placeholder="자재코드를 검색하세요..."
 * />
 * ```
 */

interface MaterialSelectorDialogSingleProps {
  /** Dialog를 여는 트리거 버튼 텍스트 */
  triggerLabel?: string;
  /** 현재 선택된 자재 */
  selectedMaterial?: MaterialSearchItem | null;
  /** 자재 선택 완료 시 호출되는 콜백 */
  onMaterialSelect?: (material: MaterialSearchItem | null) => void;
  /** 검색 입력창 placeholder */
  placeholder?: string;
  /** Dialog 제목 */
  title?: string;
  /** Dialog 설명 */
  description?: string;
  /** 트리거 버튼 비활성화 여부 */
  disabled?: boolean;
  /** 트리거 버튼 variant */
  triggerVariant?: "default" | "destructive" | "outline" | "secondary" | "ghost" | "link";
  /** 제외할 자재코드들 */
  excludeMaterialCodes?: Set<string>;
}

export function MaterialSelectorDialogSingle({
  triggerLabel = "자재 선택",
  selectedMaterial = null,
  onMaterialSelect,
  placeholder = "자재코드를 검색하세요...",
  title = "자재 선택",
  description = "원하는 자재를 검색하고 선택해주세요.",
  disabled = false,
  triggerVariant = "outline",
  excludeMaterialCodes,
}: MaterialSelectorDialogSingleProps) {
  // Dialog 열림/닫힘 상태
  const [open, setOpen] = useState(false);

  // Dialog 내에서 임시로 선택된 자재 (확인 버튼 클릭 전까지)
  const [tempSelectedMaterial, setTempSelectedMaterial] = useState<MaterialSearchItem | null>(null);

  // 검색어
  const [searchQuery, setSearchQuery] = useState("");

  // 페이지네이션 상태
  const [currentPage, setCurrentPage] = useState(1);
  const [searchResults, setSearchResults] = useState<MaterialSearchItem[]>([]);
  const [pagination, setPagination] = useState({
    page: 1,
    perPage: 10,
    total: 0,
    pageCount: 0,
    hasNextPage: false,
    hasPrevPage: false,
  });

  // 로딩 상태
  const [isSearching, setIsSearching] = useState(false);

  // 에러 상태
  const [error, setError] = useState<string | null>(null);

  // Debounce 적용된 검색어
  const debouncedSearchQuery = useDebounce(searchQuery, 300);

  // 검색 실행 함수
  const performSearch = useCallback(async (query: string, page: number = 1) => {
    setIsSearching(true);
    setError(null);

    try {
      const result = await searchMaterialsForDialog(query, page, 10);

      if (result.success) {
        setSearchResults(result.data);
        setPagination(result.pagination);
        setCurrentPage(page);
      } else {
        setSearchResults([]);
        setError(result.error || "검색 중 오류가 발생했습니다.");
        setPagination({
          page: 1,
          perPage: 10,
          total: 0,
          pageCount: 0,
          hasNextPage: false,
          hasPrevPage: false,
        });
      }
    } catch (err) {
      console.error("자재 검색 실패:", err);
      setSearchResults([]);
      setError("검색 중 오류가 발생했습니다.");
      setPagination({
        page: 1,
        perPage: 10,
        total: 0,
        pageCount: 0,
        hasNextPage: false,
        hasPrevPage: false,
      });
    } finally {
      setIsSearching(false);
    }
  }, []);

  // Dialog 열림 시 초기화 및 첫 검색
  const handleOpenChange = useCallback((newOpen: boolean) => {
    setOpen(newOpen);
    if (newOpen) {
      setTempSelectedMaterial(selectedMaterial || null);
      setSearchQuery("");
      setCurrentPage(1);
      // 초기 데이터 로드
      performSearch("", 1);
    }
  }, [selectedMaterial, performSearch]);

  // 검색어 변경 시 검색 실행
  React.useEffect(() => {
    if (open) {
      setCurrentPage(1);
      performSearch(debouncedSearchQuery, 1);
    }
  }, [debouncedSearchQuery, performSearch, open]);

  // 페이지 변경 처리
  const handlePageChange = useCallback((newPage: number) => {
    if (newPage >= 1 && newPage <= pagination.pageCount) {
      setCurrentPage(newPage);
      performSearch(debouncedSearchQuery, newPage);
    }
  }, [pagination.pageCount, performSearch, debouncedSearchQuery]);

  // 자재 선택 처리
  const handleMaterialSelect = useCallback((material: MaterialSearchItem) => {
    setTempSelectedMaterial(material);
  }, []);

  // 선택 해제
  const handleClear = useCallback(() => {
    setTempSelectedMaterial(null);
  }, []);

  // 확인 버튼 클릭 시 선택 완료
  const handleConfirm = useCallback(() => {
    onMaterialSelect?.(tempSelectedMaterial);
    setOpen(false);
  }, [tempSelectedMaterial, onMaterialSelect]);

  // 취소 버튼 클릭 시
  const handleCancel = useCallback(() => {
    setTempSelectedMaterial(selectedMaterial || null);
    setOpen(false);
  }, [selectedMaterial]);

  return (
    <Dialog open={open} onOpenChange={handleOpenChange}>
      <DialogTrigger asChild>
        <Button variant={triggerVariant} disabled={disabled}>
          {selectedMaterial ? (
            <span className="truncate">
              {selectedMaterial.displayText}
            </span>
          ) : (
            triggerLabel
          )}
        </Button>
      </DialogTrigger>

      <DialogContent className="max-w-4xl max-h-[80vh]">
        <DialogHeader>
          <DialogTitle>{title}</DialogTitle>
          <DialogDescription>{description}</DialogDescription>
        </DialogHeader>

        <div className="space-y-4">
          {/* 검색 입력창 */}
          <div className="relative">
            <Search className="absolute left-3 top-1/2 transform -translate-y-1/2 text-gray-400 h-4 w-4" />
            <Input
              placeholder={placeholder}
              value={searchQuery}
              onChange={(e) => setSearchQuery(e.target.value)}
              className="pl-10"
            />
          </div>

          {/* 선택된 자재 표시 */}
          {tempSelectedMaterial && (
            <div className="flex items-center gap-2 p-3 bg-blue-50 rounded-lg border">
              <span className="text-sm font-medium text-blue-900">선택됨:</span>
              <Badge variant="secondary" className="gap-1">
                <span>{tempSelectedMaterial.displayText}</span>
                <button
                  type="button"
                  onClick={handleClear}
                  className="ml-1 h-3 w-3 rounded-sm hover:bg-red-100 flex items-center justify-center"
                >
                  <X className="h-3 w-3 hover:text-red-500" />
                </button>
              </Badge>
            </div>
          )}

          {/* 테이블 */}
          <div className="border rounded-lg max-h-96 overflow-y-auto">
            {isSearching ? (
              <div className="p-8 text-center text-muted-foreground">
                검색 중...
              </div>
            ) : error ? (
              <div className="p-8 text-center text-red-500">
                {error}
              </div>
            ) : (
              <Table>
                <TableHeader>
                  <TableRow>
                    <TableHead className="w-12">선택</TableHead>
                    <TableHead>자재코드</TableHead>
                    <TableHead>자재명</TableHead>
                  </TableRow>
                </TableHeader>
                <TableBody>
                  {searchResults.length === 0 ? (
                    <TableRow>
                      <TableCell colSpan={3} className="text-center py-8 text-muted-foreground">
                        {debouncedSearchQuery.trim() ? "검색 결과가 없습니다." : "자재가 없습니다."}
                      </TableCell>
                    </TableRow>
                  ) : (
                    searchResults.map((material) => {
                      const isExcluded = excludeMaterialCodes?.has(material.materialCode);
                      const isSelected = tempSelectedMaterial?.materialCode === material.materialCode;

                      return (
                        <TableRow
                          key={material.materialCode}
                          className={`cursor-pointer hover:bg-muted/50 ${
                            isExcluded ? 'opacity-50 cursor-not-allowed' : ''
                          } ${isSelected ? 'bg-blue-50' : ''}`}
                          onClick={() => {
                            if (!isExcluded) {
                              handleMaterialSelect(material);
                            }
                          }}
                        >
                          <TableCell>
                            <Checkbox
                              checked={isSelected}
                              disabled={isExcluded}
                              onCheckedChange={() => {
                                if (!isExcluded) {
                                  handleMaterialSelect(material);
                                }
                              }}
                            />
                          </TableCell>
                          <TableCell className="font-mono text-sm">
                            {material.materialCode}
                            {isExcluded && (
                              <span className="ml-2 text-xs bg-red-100 text-red-600 px-2 py-1 rounded">
                                제외됨
                              </span>
                            )}
                          </TableCell>
                          <TableCell>{material.materialName}</TableCell>
                        </TableRow>
                      );
                    })
                  )}
                </TableBody>
              </Table>
            )}
          </div>

          {/* 페이지네이션 */}
          {searchResults.length > 0 && pagination.pageCount > 1 && (
            <div className="flex items-center justify-between">
              <div className="text-sm text-muted-foreground">
                총 {pagination.total}개 중 {(pagination.page - 1) * pagination.perPage + 1}-
                {Math.min(pagination.page * pagination.perPage, pagination.total)}개 표시
              </div>
              <div className="flex items-center gap-2">
                <Button
                  variant="outline"
                  size="sm"
                  onClick={() => handlePageChange(currentPage - 1)}
                  disabled={!pagination.hasPrevPage || isSearching}
                >
                  <ChevronLeft className="h-4 w-4" />
                  이전
                </Button>
                <span className="text-sm">
                  {pagination.page} / {pagination.pageCount}
                </span>
                <Button
                  variant="outline"
                  size="sm"
                  onClick={() => handlePageChange(currentPage + 1)}
                  disabled={!pagination.hasNextPage || isSearching}
                >
                  다음
                  <ChevronRight className="h-4 w-4" />
                </Button>
              </div>
            </div>
          )}
        </div>

        <DialogFooter className="gap-2">
          <Button variant="outline" onClick={handleCancel}>
            취소
          </Button>
          {tempSelectedMaterial && (
            <Button variant="ghost" onClick={handleClear}>
              선택 해제
            </Button>
          )}
          <Button onClick={handleConfirm}>
            확인
          </Button>
        </DialogFooter>
      </DialogContent>
    </Dialog>
  );
}

/**
 * 사용 예시:
 *
 * ```tsx
 * const [selectedMaterial, setSelectedMaterial] = useState<MaterialSearchItem | null>(null);
 *
 * return (
 *   <MaterialSelectorDialogSingle
 *     triggerLabel="자재 선택"
 *     selectedMaterial={selectedMaterial}
 *     onMaterialSelect={(material) => {
 *       setSelectedMaterial(material);
 *       if (material) {
 *         console.log('선택된 자재:', {
 *           code: material.materialCode,
 *           name: material.materialName,
 *           displayText: material.displayText
 *         });
 *       } else {
 *         console.log('자재 선택이 해제되었습니다.');
 *       }
 *     }}
 *     title="자재 선택"
 *     description="필요한 자재를 검색하고 선택해주세요."
 *   />
 * );
 * ```
 */