'use client';

/**
 * 재고 조정 팝업 (기획서 Page 78)
 *
 * - 품목 선택 (검색)
 * - 유형 필터 셀렉트 박스 (전체, 유형 목록)
 * - 테이블: 로트번호, 품목코드, 품목유형, 품목명, 규격, 단위, 재고량, 증감 수량
 * - 증감 수량: 양수/음수 입력 가능
 * - 취소/저장 버튼
 */

import { useState, useMemo, useCallback } from 'react';
import { Search, Loader2 } from 'lucide-react';
import { Button } from '@/components/ui/button';
import { Input } from '@/components/ui/input';
import {
  Dialog,
  DialogContent,
  DialogHeader,
  DialogTitle,
  DialogDescription,
  VisuallyHidden,
} from '@/components/ui/dialog';
import {
  Select,
  SelectContent,
  SelectItem,
  SelectTrigger,
  SelectValue,
} from '@/components/ui/select';
import {
  Table,
  TableBody,
  TableCell,
  TableHead,
  TableHeader,
  TableRow,
} from '@/components/ui/table';
import { toast } from 'sonner';
import type { InventoryAdjustmentItem } from './types';

// 목데이터 - 품목 유형 목록
const ITEM_TYPE_OPTIONS = [
  { value: 'all', label: '전체' },
  { value: 'raw', label: '원자재' },
  { value: 'sub', label: '부자재' },
  { value: 'part', label: '부품' },
  { value: 'product', label: '완제품' },
];

// 목데이터 - 재고 품목 목록
const MOCK_STOCK_ITEMS: InventoryAdjustmentItem[] = [
  { id: '1', lotNo: 'LOT-2026-001', itemCode: 'STEEL-001', itemType: '원자재', itemName: 'SUS304 스테인리스 판재', specification: '1000x2000x3T', unit: 'EA', stockQty: 100 },
  { id: '2', lotNo: 'LOT-2026-002', itemCode: 'ELEC-002', itemType: '부품', itemName: 'MCU 컨트롤러 IC', specification: 'STM32F103C8T6', unit: 'EA', stockQty: 500 },
  { id: '3', lotNo: 'LOT-2026-003', itemCode: 'PLAS-003', itemType: '부자재', itemName: 'ABS 사출 케이스', specification: '150x100x50', unit: 'SET', stockQty: 200 },
  { id: '4', lotNo: 'LOT-2026-004', itemCode: 'STEEL-002', itemType: '원자재', itemName: '알루미늄 프로파일', specification: '40x40x2000L', unit: 'EA', stockQty: 50 },
  { id: '5', lotNo: 'LOT-2026-005', itemCode: 'ELEC-005', itemType: '부품', itemName: 'DC 모터 24V', specification: '24V 100RPM', unit: 'EA', stockQty: 80 },
  { id: '6', lotNo: 'LOT-2026-006', itemCode: 'CHEM-001', itemType: '부자재', itemName: '에폭시 접착제', specification: '500ml', unit: 'EA', stockQty: 300 },
  { id: '7', lotNo: 'LOT-2026-007', itemCode: 'ELEC-007', itemType: '부품', itemName: '커패시터 100uF', specification: '100uF 50V', unit: 'EA', stockQty: 1000 },
];

interface Props {
  open: boolean;
  onOpenChange: (open: boolean) => void;
  onSave?: (items: InventoryAdjustmentItem[]) => void;
}

export function InventoryAdjustmentDialog({ open, onOpenChange, onSave }: Props) {
  const [search, setSearch] = useState('');
  const [typeFilter, setTypeFilter] = useState('all');
  const [adjustments, setAdjustments] = useState<Record<string, number | undefined>>({});
  const [isSaving, setIsSaving] = useState(false);

  // 필터링된 품목 목록
  const filteredItems = useMemo(() => {
    return MOCK_STOCK_ITEMS.filter((item) => {
      const matchesSearch = !search ||
        item.itemCode.toLowerCase().includes(search.toLowerCase()) ||
        item.itemName.toLowerCase().includes(search.toLowerCase()) ||
        item.lotNo.toLowerCase().includes(search.toLowerCase());
      const matchesType = typeFilter === 'all' || item.itemType === ITEM_TYPE_OPTIONS.find(o => o.value === typeFilter)?.label;
      return matchesSearch && matchesType;
    });
  }, [search, typeFilter]);

  // 증감 수량 변경
  const handleAdjustmentChange = useCallback((itemId: string, value: string) => {
    const numValue = value === '' || value === '-' ? undefined : Number(value);
    setAdjustments((prev) => ({
      ...prev,
      [itemId]: numValue,
    }));
  }, []);

  // 저장
  const handleSave = async () => {
    const itemsWithAdjustment = MOCK_STOCK_ITEMS
      .filter((item) => adjustments[item.id] !== undefined && adjustments[item.id] !== 0)
      .map((item) => ({ ...item, adjustmentQty: adjustments[item.id] }));

    if (itemsWithAdjustment.length === 0) {
      toast.error('증감 수량을 입력해주세요.');
      return;
    }

    setIsSaving(true);
    try {
      onSave?.(itemsWithAdjustment);
      toast.success('재고 조정이 저장되었습니다.');
      handleClose();
    } catch {
      toast.error('저장 중 오류가 발생했습니다.');
    } finally {
      setIsSaving(false);
    }
  };

  // 닫기 (상태 초기화)
  const handleClose = () => {
    setSearch('');
    setTypeFilter('all');
    setAdjustments({});
    onOpenChange(false);
  };

  return (
    <Dialog open={open} onOpenChange={handleClose}>
      <DialogContent className="max-w-[700px] max-h-[80vh] flex flex-col">
        <DialogHeader>
          <DialogTitle className="text-lg font-semibold">재고 조정</DialogTitle>
          <VisuallyHidden><DialogDescription>재고 수량 조정</DialogDescription></VisuallyHidden>
        </DialogHeader>

        <div className="flex flex-col gap-4 flex-1 min-h-0">
          {/* 품목 선택 - 검색 */}
          <div className="font-medium text-sm">품목 선택</div>
          <div className="relative">
            <Input
              value={search}
              onChange={(e) => setSearch(e.target.value)}
              placeholder="품목코드, 품목명, 로트번호 검색"
              className="pr-10"
            />
            <Search className="absolute right-3 top-1/2 -translate-y-1/2 w-4 h-4 text-muted-foreground" />
          </div>

          {/* 총 건수 + 유형 필터 */}
          <div className="flex items-center justify-between">
            <span className="text-sm text-muted-foreground">
              총 <strong>{filteredItems.length}</strong>건
            </span>
            <Select value={typeFilter} onValueChange={setTypeFilter}>
              <SelectTrigger className="min-w-[120px] w-auto h-8 text-sm">
                <SelectValue />
              </SelectTrigger>
              <SelectContent>
                {ITEM_TYPE_OPTIONS.map((option) => (
                  <SelectItem key={option.value} value={option.value}>
                    {option.label}
                  </SelectItem>
                ))}
              </SelectContent>
            </Select>
          </div>

          {/* 테이블 */}
          <div className="flex-1 overflow-auto border rounded-md">
            <Table>
              <TableHeader>
                <TableRow className="bg-gray-50">
                  <TableHead className="text-center w-[100px]">로트번호</TableHead>
                  <TableHead className="text-center w-[90px]">품목코드</TableHead>
                  <TableHead className="text-center w-[70px]">품목유형</TableHead>
                  <TableHead className="min-w-[120px]">품목명</TableHead>
                  <TableHead className="w-[90px]">규격</TableHead>
                  <TableHead className="text-center w-[50px]">단위</TableHead>
                  <TableHead className="text-center w-[70px]">재고량</TableHead>
                  <TableHead className="text-center w-[90px]">증감 수량</TableHead>
                </TableRow>
              </TableHeader>
              <TableBody>
                {filteredItems.map((item) => (
                  <TableRow key={item.id}>
                    <TableCell className="text-center text-sm">{item.lotNo}</TableCell>
                    <TableCell className="text-center text-sm">{item.itemCode}</TableCell>
                    <TableCell className="text-center text-sm">{item.itemType}</TableCell>
                    <TableCell className="text-sm">{item.itemName}</TableCell>
                    <TableCell className="text-sm">{item.specification}</TableCell>
                    <TableCell className="text-center text-sm">{item.unit}</TableCell>
                    <TableCell className="text-center text-sm">{item.stockQty}</TableCell>
                    <TableCell className="text-center">
                      <Input
                        type="number"
                        value={adjustments[item.id] ?? ''}
                        onChange={(e) => handleAdjustmentChange(item.id, e.target.value)}
                        className="h-8 text-sm text-center w-[80px] mx-auto"
                        placeholder="0"
                      />
                    </TableCell>
                  </TableRow>
                ))}
                {filteredItems.length === 0 && (
                  <TableRow>
                    <TableCell colSpan={8} className="text-center py-8 text-muted-foreground">
                      검색 결과가 없습니다.
                    </TableCell>
                  </TableRow>
                )}
              </TableBody>
            </Table>
          </div>

          {/* 하단 버튼 */}
          <div className="flex justify-center gap-3 pt-2">
            <Button
              variant="outline"
              onClick={handleClose}
              className="min-w-[120px]"
              disabled={isSaving}
            >
              취소
            </Button>
            <Button
              variant="default"
              onClick={handleSave}
              className="min-w-[120px] bg-gray-900 text-white hover:bg-gray-800"
              disabled={isSaving}
            >
              {isSaving && <Loader2 className="w-4 h-4 mr-1 animate-spin" />}
              저장
            </Button>
          </div>
        </div>
      </DialogContent>
    </Dialog>
  );
}