'use client';

/**
 * 재고 실사 모달
 *
 * 기능:
 * - 재고 목록 표시 (품목코드, 품목명, 규격, 단위, 실제 재고량)
 * - 실제 재고량 입력/수정
 * - 저장 시 일괄 업데이트
 */

import { useState, useEffect, useCallback } from 'react';
import { Loader2 } from 'lucide-react';
import { ContentSkeleton } from '@/components/ui/skeleton';
import {
  Dialog,
  DialogContent,
  DialogHeader,
  DialogTitle,
} from '@/components/ui/dialog';
import { Button } from '@/components/ui/button';
import { Input } from '@/components/ui/input';
import {
  Table,
  TableBody,
  TableCell,
  TableHead,
  TableHeader,
  TableRow,
} from '@/components/ui/table';
import { toast } from 'sonner';
import { isNextRedirectError } from '@/lib/utils/redirect-error';
import { updateStockAudit } from './actions';
import type { StockItem } from './types';

interface StockAuditModalProps {
  open: boolean;
  onOpenChange: (open: boolean) => void;
  stocks: StockItem[];
  onComplete?: () => void;
}

interface AuditItem {
  id: string;
  itemCode: string;
  itemName: string;
  specification: string;
  unit: string;
  actualQty: number;
  newActualQty: number;
}

export function StockAuditModal({
  open,
  onOpenChange,
  stocks,
  onComplete,
}: StockAuditModalProps) {
  const [auditItems, setAuditItems] = useState<AuditItem[]>([]);
  const [isLoading, setIsLoading] = useState(false);
  const [isSubmitting, setIsSubmitting] = useState(false);

  // 모달이 열릴 때 데이터 초기화
  useEffect(() => {
    if (open && stocks.length > 0) {
      setAuditItems(
        stocks.map((stock) => ({
          id: stock.id,
          itemCode: stock.itemCode,
          itemName: stock.itemName,
          specification: stock.specification || '',
          unit: stock.unit,
          actualQty: stock.actualQty,
          newActualQty: stock.actualQty,
        }))
      );
    }
  }, [open, stocks]);

  // 실제 재고량 변경 핸들러
  const handleQtyChange = useCallback((id: string, value: string) => {
    const numValue = value === '' ? 0 : parseFloat(value);
    if (isNaN(numValue)) return;

    setAuditItems((prev) =>
      prev.map((item) =>
        item.id === id ? { ...item, newActualQty: numValue } : item
      )
    );
  }, []);

  // 저장
  const handleSubmit = async () => {
    // 변경된 항목만 필터링
    const changedItems = auditItems.filter(
      (item) => item.actualQty !== item.newActualQty
    );

    if (changedItems.length === 0) {
      toast.info('변경된 항목이 없습니다.');
      return;
    }

    setIsSubmitting(true);
    try {
      const updates = changedItems.map((item) => ({
        id: item.id,
        actualQty: item.newActualQty,
      }));

      const result = await updateStockAudit(updates);

      if (result.success) {
        toast.success(`${changedItems.length}개 항목의 재고가 업데이트되었습니다.`);
        onOpenChange(false);
        onComplete?.();
      } else {
        toast.error(result.error || '재고 실사 저장에 실패했습니다.');
      }
    } catch (error) {
      if (isNextRedirectError(error)) throw error;
      console.error('[StockAuditModal] handleSubmit error:', error);
      toast.error('재고 실사 저장 중 오류가 발생했습니다.');
    } finally {
      setIsSubmitting(false);
    }
  };

  // 취소
  const handleCancel = () => {
    onOpenChange(false);
  };

  return (
    <Dialog open={open} onOpenChange={onOpenChange}>
      <DialogContent className="max-w-[95vw] md:max-w-[1200px] w-full p-0 gap-0 max-h-[80vh] flex flex-col">
        {/* 헤더 */}
        <DialogHeader className="p-6 pb-4 flex-shrink-0">
          <DialogTitle className="text-xl font-semibold">재고 실사</DialogTitle>
        </DialogHeader>

        <div className="px-6 pb-6 space-y-6 flex-1 overflow-hidden flex flex-col">
          {/* 테이블 */}
          {isLoading ? (
            <ContentSkeleton type="table" rows={6} />
          ) : auditItems.length === 0 ? (
            <div className="border rounded-lg flex-1">
              <Table>
                <TableHeader>
                  <TableRow className="bg-gray-50">
                    <TableHead className="text-center">품목코드</TableHead>
                    <TableHead className="text-center">품목명</TableHead>
                    <TableHead className="text-center">규격</TableHead>
                    <TableHead className="text-center">단위</TableHead>
                    <TableHead className="text-center">실제 재고량</TableHead>
                  </TableRow>
                </TableHeader>
                <TableBody>
                  <TableRow>
                    <TableCell colSpan={5} className="text-center py-12 text-gray-500">
                      재고 데이터가 없습니다.
                    </TableCell>
                  </TableRow>
                </TableBody>
              </Table>
            </div>
          ) : (
            <div className="border rounded-lg overflow-auto flex-1">
              <Table className="w-full">
                <TableHeader className="sticky top-0 bg-gray-50 z-10">
                  <TableRow className="bg-gray-50">
                    <TableHead className="text-center font-medium w-[15%]">품목코드</TableHead>
                    <TableHead className="text-center font-medium w-[30%]">품목명</TableHead>
                    <TableHead className="text-center font-medium w-[20%]">규격</TableHead>
                    <TableHead className="text-center font-medium w-[10%]">단위</TableHead>
                    <TableHead className="text-center font-medium w-[15%]">실제 재고량</TableHead>
                  </TableRow>
                </TableHeader>
                <TableBody>
                  {auditItems.map((item) => (
                    <TableRow key={item.id}>
                      <TableCell className="text-center font-medium">
                        {item.itemCode}
                      </TableCell>
                      <TableCell className="text-center max-w-[200px] truncate" title={item.itemName}>
                        {item.itemName}
                      </TableCell>
                      <TableCell className="text-center">{item.specification || '-'}</TableCell>
                      <TableCell className="text-center">{item.unit}</TableCell>
                      <TableCell className="text-center">
                        <Input
                          type="number"
                          value={item.newActualQty}
                          onChange={(e) => handleQtyChange(item.id, e.target.value)}
                          className="w-24 text-center mx-auto"
                          min={0}
                          step={1}
                        />
                      </TableCell>
                    </TableRow>
                  ))}
                </TableBody>
              </Table>
            </div>
          )}

          {/* 버튼 영역 */}
          <div className="flex gap-3 flex-shrink-0">
            <Button
              variant="outline"
              onClick={handleCancel}
              disabled={isSubmitting}
              className="flex-1 py-6 text-base font-medium"
            >
              취소
            </Button>
            <Button
              onClick={handleSubmit}
              disabled={isSubmitting}
              className="flex-1 py-6 text-base font-medium bg-gray-900 hover:bg-gray-800"
            >
              {isSubmitting ? (
                <>
                  <Loader2 className="w-4 h-4 mr-2 animate-spin" />
                  저장 중...
                </>
              ) : (
                '저장'
              )}
            </Button>
          </div>
        </div>
      </DialogContent>
    </Dialog>
  );
}