'use client';

/**
 * 입고처리 다이얼로그
 * - 발주 정보 표시
 * - 입고LOT*, 공급업체LOT, 입고수량* 입력 (필수)
 * - 입고위치, 비고 입력 (선택)
 */

import { useState, useCallback } from 'react';
import { Loader2 } from 'lucide-react';
import { Button } from '@/components/ui/button';
import { Input } from '@/components/ui/input';
import { Label } from '@/components/ui/label';
import { Textarea } from '@/components/ui/textarea';
import { QuantityInput } from '@/components/ui/quantity-input';
import {
  Dialog,
  DialogContent,
  DialogHeader,
  DialogTitle,
} from '@/components/ui/dialog';
import { Alert, AlertDescription } from '@/components/ui/alert';
import type { ReceivingDetail, ReceivingProcessFormData } from './types';

// LOT 번호 생성 함수 (YYMMDD-NN 형식)
function generateLotNo(): string {
  const now = new Date();
  const yy = String(now.getFullYear()).slice(-2);
  const mm = String(now.getMonth() + 1).padStart(2, '0');
  const dd = String(now.getDate()).padStart(2, '0');
  const random = String(Math.floor(Math.random() * 100)).padStart(2, '0');
  return `${yy}${mm}${dd}-${random}`;
}

interface Props {
  open: boolean;
  onOpenChange: (open: boolean) => void;
  detail: ReceivingDetail;
  onComplete: (formData: ReceivingProcessFormData) => void;
}

export function ReceivingProcessDialog({ open, onOpenChange, detail, onComplete }: Props) {
  // 폼 데이터
  const [receivingLot, setReceivingLot] = useState(() => generateLotNo());
  const [supplierLot, setSupplierLot] = useState('');
  const [receivingQty, setReceivingQty] = useState<string>((detail.orderQty ?? 0).toString());
  const [receivingLocation, setReceivingLocation] = useState('');
  const [remark, setRemark] = useState('');

  // 유효성 검사 에러
  const [validationErrors, setValidationErrors] = useState<string[]>([]);
  const [isSubmitting, setIsSubmitting] = useState(false);

  // 유효성 검사
  const validateForm = useCallback((): boolean => {
    const errors: string[] = [];

    if (!receivingLot.trim()) {
      errors.push('입고LOT는 필수 입력 항목입니다.');
    }

    if (!receivingQty.trim() || isNaN(Number(receivingQty)) || Number(receivingQty) <= 0) {
      errors.push('입고수량은 필수 입력 항목입니다. 유효한 숫자를 입력해주세요.');
    }

    // 입고위치는 선택 항목 (필수 검사 제거)

    setValidationErrors(errors);
    return errors.length === 0;
  }, [receivingLot, receivingQty]);

  // 입고 처리
  const handleSubmit = useCallback(async () => {
    if (!validateForm()) {
      return;
    }

    setIsSubmitting(true);

    const formData: ReceivingProcessFormData = {
      receivingQty: Number(receivingQty),
      receivingLot,
      supplierLot: supplierLot || undefined,
      receivingLocation: receivingLocation || undefined,
      remark: remark || undefined,
    };

    await onComplete(formData);
    setIsSubmitting(false);
  }, [validateForm, receivingLot, supplierLot, receivingQty, receivingLocation, remark, onComplete]);

  // 취소
  const handleCancel = useCallback(() => {
    onOpenChange(false);
  }, [onOpenChange]);

  // 다이얼로그 닫힐 때 상태 초기화
  const handleOpenChange = useCallback(
    (newOpen: boolean) => {
      if (!newOpen) {
        setValidationErrors([]);
      }
      onOpenChange(newOpen);
    },
    [onOpenChange]
  );

  return (
    <Dialog open={open} onOpenChange={handleOpenChange}>
      <DialogContent className="max-w-md">
        <DialogHeader>
          <DialogTitle>입고 처리</DialogTitle>
        </DialogHeader>

        <div className="space-y-6 mt-4">
          {/* 발주 정보 요약 */}
          <div className="grid grid-cols-2 gap-4 text-sm">
            <div>
              <span className="text-muted-foreground">발주번호:</span>{' '}
              <span className="font-medium">{detail.orderNo}</span>
            </div>
            <div>
              <span className="text-muted-foreground">공급업체:</span>{' '}
              <span className="font-medium">{detail.supplier}</span>
            </div>
            <div>
              <span className="text-muted-foreground">품목:</span>{' '}
              <span className="font-medium">{detail.itemName}</span>
            </div>
            <div>
              <span className="text-muted-foreground">발주수량:</span>{' '}
              <span className="font-medium">{detail.orderQty} {detail.orderUnit}</span>
            </div>
          </div>

          {/* Validation 에러 표시 */}
          {validationErrors.length > 0 && (
            <Alert className="bg-red-50 border-red-200">
              <AlertDescription className="text-red-900">
                <div className="flex items-start gap-2">
                  <span className="text-lg">⚠️</span>
                  <div className="flex-1">
                    <strong className="block mb-2">
                      입력 내용을 확인해주세요 ({validationErrors.length}개 오류)
                    </strong>
                    <ul className="space-y-1 text-sm">
                      {validationErrors.map((error, index) => (
                        <li key={index} className="flex items-start gap-1">
                          <span>•</span>
                          <span>{error}</span>
                        </li>
                      ))}
                    </ul>
                  </div>
                </div>
              </AlertDescription>
            </Alert>
          )}

          {/* 입력 필드 */}
          <div className="grid grid-cols-2 gap-4">
            <div className="space-y-2">
              <Label className="text-sm">
                입고LOT <span className="text-red-500">*</span>
              </Label>
              <Input
                value={receivingLot}
                onChange={(e) => {
                  setReceivingLot(e.target.value);
                  setValidationErrors([]);
                }}
                placeholder="예: 251223-41"
              />
            </div>
            <div className="space-y-2">
              <Label className="text-sm text-muted-foreground">공급업체LOT</Label>
              <Input
                value={supplierLot}
                onChange={(e) => setSupplierLot(e.target.value)}
                placeholder="예: 2402944"
              />
            </div>
            <div className="space-y-2">
              <Label className="text-sm">
                입고수량 <span className="text-red-500">*</span>
              </Label>
              <QuantityInput
                value={parseFloat(receivingQty) || 0}
                onChange={(value) => {
                  setReceivingQty(String(value ?? 0));
                  setValidationErrors([]);
                }}
                placeholder="수량 입력"
              />
            </div>
            <div className="space-y-2">
              <Label className="text-sm text-muted-foreground">입고위치</Label>
              <Input
                value={receivingLocation}
                onChange={(e) => setReceivingLocation(e.target.value)}
                placeholder="예: A-01"
              />
            </div>
          </div>

          {/* 비고 */}
          <div className="space-y-2">
            <Label className="text-sm text-muted-foreground">비고</Label>
            <Textarea
              value={remark}
              onChange={(e) => setRemark(e.target.value)}
              placeholder="특이사항 입력"
              rows={3}
            />
          </div>
        </div>

        {/* 버튼 영역 */}
        <div className="flex justify-end gap-2 mt-6 pt-4 border-t">
          <Button variant="outline" onClick={handleCancel} disabled={isSubmitting}>
            취소
          </Button>
          <Button onClick={handleSubmit} disabled={isSubmitting}>
            {isSubmitting ? (
              <>
                <Loader2 className="w-4 h-4 mr-1.5 animate-spin" />
                처리 중...
              </>
            ) : (
              '입고 처리'
            )}
          </Button>
        </div>
      </DialogContent>
    </Dialog>
  );
}