// FPSMS-frontend/src/components/PickOrderSearch/PickExecutionForm.tsx
"use client";

import {
  Box,
  Button,
  Dialog,
  DialogActions,
  DialogContent,
  DialogTitle,
  FormControl,
  Grid,
  InputLabel,
  MenuItem,
  Select,
  TextField,
  Typography,
} from "@mui/material";
import { useCallback, useEffect, useState } from "react";
import { useTranslation } from "react-i18next";
import { GetPickOrderLineInfo, PickExecutionIssueData } from "@/app/api/pickOrder/actions";
import { fetchEscalationCombo } from "@/app/api/user/actions";

interface LotPickData {
  id: number; 
  lotId: number;
  lotNo: string;
  expiryDate: string;
  location: string;
  stockUnit: string;
  inQty: number;
  outQty: number;
  holdQty: number;
  totalPickedByAllPickOrders: number;
  availableQty: number;
  requiredQty: number;
  actualPickQty: number;
  lotStatus: string;
  lotAvailability: 'available' | 'insufficient_stock' | 'expired' | 'status_unavailable'|'rejected';
  stockOutLineId?: number;
  stockOutLineStatus?: string;
  stockOutLineQty?: number;
}

interface PickExecutionFormProps {
  open: boolean;
  onClose: () => void;
  onSubmit: (data: PickExecutionIssueData) => Promise<void>;
  selectedLot: LotPickData | null;
  selectedPickOrderLine: (GetPickOrderLineInfo & { pickOrderCode: string }) | null;
  pickOrderId?: number;
  pickOrderCreateDate: any;
  // ✅ Remove these props since we're not handling normal cases
  // onNormalPickSubmit?: (lineId: number, lotId: number, qty: number) => Promise<void>;
  // selectedRowId?: number | null;
}

// 定义错误类型
interface FormErrors {
  actualPickQty?: string;
  missQty?: string;
  badItemQty?: string;
  issueRemark?: string;
  handledBy?: string;
}

const PickExecutionForm: React.FC<PickExecutionFormProps> = ({
  open,
  onClose,
  onSubmit,
  selectedLot,
  selectedPickOrderLine,
  pickOrderId,
  pickOrderCreateDate,
  // ✅ Remove these props
  // onNormalPickSubmit,
  // selectedRowId,
}) => {
  const { t } = useTranslation();
  const [formData, setFormData] = useState<Partial<PickExecutionIssueData>>({});
  const [errors, setErrors] = useState<FormErrors>({});
  const [loading, setLoading] = useState(false);
  const [handlers, setHandlers] = useState<Array<{ id: number; name: string }>>([]);

  // 计算剩余可用数量
  const calculateRemainingAvailableQty = useCallback((lot: LotPickData) => {
    const remainingQty = lot.inQty - lot.outQty;
    return Math.max(0, remainingQty);
  }, []);
  const calculateRequiredQty = useCallback((lot: LotPickData) => {
    // ✅ Use the original required quantity, not subtracting actualPickQty
    // The actualPickQty in the form should be independent of the database value
    return lot.requiredQty || 0;
  }, []);
  
  // 获取处理人员列表
  useEffect(() => {
    const fetchHandlers = async () => {
      try {
        const escalationCombo = await fetchEscalationCombo();
        setHandlers(escalationCombo);
      } catch (error) {
        console.error("Error fetching handlers:", error);
      }
    };
    
    fetchHandlers();
  }, []);

  // 初始化表单数据 - 每次打开时都重新初始化
  useEffect(() => {
    if (open && selectedLot && selectedPickOrderLine && pickOrderId) {
      const getSafeDate = (dateValue: any): string => {
        if (!dateValue) return new Date().toISOString().split('T')[0];
        try {
          const date = new Date(dateValue);
          if (isNaN(date.getTime())) {
            return new Date().toISOString().split('T')[0];
          }
          return date.toISOString().split('T')[0];
        } catch {
          return new Date().toISOString().split('T')[0];
        }
      };

      // 计算剩余可用数量
      const remainingAvailableQty = calculateRemainingAvailableQty(selectedLot);
      const requiredQty = calculateRequiredQty(selectedLot);
      console.log("=== PickExecutionForm Debug ===");
      console.log("selectedLot:", selectedLot);
      console.log("inQty:", selectedLot.inQty);
      console.log("outQty:", selectedLot.outQty);
      console.log("holdQty:", selectedLot.holdQty);
      console.log("availableQty:", selectedLot.availableQty);
      console.log("calculated remainingAvailableQty:", remainingAvailableQty);
      console.log("=== End Debug ===");
      setFormData({
        pickOrderId: pickOrderId,
        pickOrderCode: selectedPickOrderLine.pickOrderCode,
        pickOrderCreateDate: getSafeDate(pickOrderCreateDate),
        pickExecutionDate: new Date().toISOString().split('T')[0],
        pickOrderLineId: selectedPickOrderLine.id,
        itemId: selectedPickOrderLine.itemId,
        itemCode: selectedPickOrderLine.itemCode,
        itemDescription: selectedPickOrderLine.itemName,
        lotId: selectedLot.lotId,
        lotNo: selectedLot.lotNo,
        storeLocation: selectedLot.location,
        requiredQty: selectedLot.requiredQty,
        actualPickQty: selectedLot.actualPickQty || 0,
        missQty: 0,
        badItemQty: 0, // 初始化为 0，用户需要手动输入
        issueRemark: '',
        pickerName: '',
        handledBy: undefined,
      });
    }
  }, [open, selectedLot, selectedPickOrderLine, pickOrderId, pickOrderCreateDate, calculateRemainingAvailableQty]);

  const handleInputChange = useCallback((field: keyof PickExecutionIssueData, value: any) => {
    setFormData(prev => ({ ...prev, [field]: value }));
    // 清除错误
    if (errors[field as keyof FormErrors]) {
      setErrors(prev => ({ ...prev, [field]: undefined }));
    }
  }, [errors]);

  // ✅ Update form validation to require either missQty > 0 OR badItemQty > 0
  const validateForm = (): boolean => {
    const newErrors: FormErrors = {};
    
    if (formData.actualPickQty === undefined || formData.actualPickQty < 0) {
      newErrors.actualPickQty = t('Qty is required');
    }
    
    // ✅ FIXED: Check if actual pick qty exceeds remaining available qty
    if (formData.actualPickQty && formData.actualPickQty > remainingAvailableQty) {
      newErrors.actualPickQty = t('Qty is not allowed to be greater than remaining available qty');
    }
    
    // ✅ FIXED: Check if actual pick qty exceeds required qty (use original required qty)
    if (formData.actualPickQty && formData.actualPickQty > (selectedLot?.requiredQty || 0)) {
      newErrors.actualPickQty = t('Qty is not allowed to be greater than required qty');
    }
    
    // ✅ NEW: Require either missQty > 0 OR badItemQty > 0 (at least one issue must be reported)
    const hasMissQty = formData.missQty && formData.missQty > 0;
    const hasBadItemQty = formData.badItemQty && formData.badItemQty > 0;
    
    if (!hasMissQty && !hasBadItemQty) {
      newErrors.missQty = t('At least one issue must be reported');
      newErrors.badItemQty = t('At least one issue must be reported');
    }
    
    setErrors(newErrors);
    return Object.keys(newErrors).length === 0;
  };

  const handleSubmit = async () => {
    if (!validateForm() || !formData.pickOrderId) {
      return;
    }

    setLoading(true);
    try {
      await onSubmit(formData as PickExecutionIssueData);
      onClose();
    } catch (error) {
      console.error('Error submitting pick execution issue:', error);
    } finally {
      setLoading(false);
    }
  };

  const handleClose = () => {
    setFormData({});
    setErrors({});
    onClose();
  };

  if (!selectedLot || !selectedPickOrderLine) {
    return null;
  }

  const remainingAvailableQty = calculateRemainingAvailableQty(selectedLot);
  const requiredQty = calculateRequiredQty(selectedLot);
  
  return (
    <Dialog open={open} onClose={handleClose} maxWidth="sm" fullWidth>
      <DialogTitle>
        {t('Pick Execution Issue Form')} {/* ✅ Always show issue form title */}
      </DialogTitle>
      <DialogContent>
        <Box sx={{ mt: 2 }}>
          {/* ✅ Add instruction text */}
          <Grid container spacing={2}>
            <Grid item xs={12}>
              <Box sx={{ p: 2, backgroundColor: '#fff3cd', borderRadius: 1, mb: 2 }}>
                <Typography variant="body2" color="warning.main">
                  <strong>{t('Note:')}</strong> {t('This form is for reporting issues only. You must report either missing items or bad items.')}
                </Typography>
              </Box>
            </Grid>
            
            {/* ✅ Keep the existing form fields */}
            <Grid item xs={6}>
              <TextField
                fullWidth
                label={t('Required Qty')}
                value={selectedLot?.requiredQty || 0} 
                disabled
                variant="outlined"
               // helperText={t('Still need to pick')}
              />
            </Grid>
            
            <Grid item xs={6}>
              <TextField
                fullWidth
                label={t('Remaining Available Qty')}
                value={remainingAvailableQty}
                disabled
                variant="outlined"
               // helperText={t('Available in warehouse')}
              />
            </Grid>

            <Grid item xs={12}>
              <TextField
                fullWidth
                label={t('Actual Pick Qty')}
                type="number"
                value={formData.actualPickQty || 0}
                onChange={(e) => handleInputChange('actualPickQty', parseFloat(e.target.value) || 0)}
                error={!!errors.actualPickQty}
                helperText={errors.actualPickQty || `${t('Max')}: ${Math.min(remainingAvailableQty, selectedLot?.requiredQty || 0)}`}
                variant="outlined"
              />
            </Grid>

            <Grid item xs={12}>
              <TextField
                fullWidth
                label={t('Missing item Qty')}
                type="number"
                value={formData.missQty || 0}
                onChange={(e) => handleInputChange('missQty', parseFloat(e.target.value) || 0)}
                error={!!errors.missQty}
               // helperText={errors.missQty || t('Enter missing quantity (required if no bad items)')}
                variant="outlined"
              />
            </Grid>

            <Grid item xs={12}>
              <TextField
                fullWidth
                label={t('Bad Item Qty')}
                type="number"
                value={formData.badItemQty || 0}
                onChange={(e) => handleInputChange('badItemQty', parseFloat(e.target.value) || 0)}
                error={!!errors.badItemQty}
               // helperText={errors.badItemQty || t('Enter bad item quantity (required if no missing items)')}
                variant="outlined"
              />
            </Grid>
            
            {/* ✅ Show issue description and handler fields when bad items > 0 */}
            {(formData.badItemQty && formData.badItemQty > 0) ? (
              <>
                <Grid item xs={12}>
                  <TextField
                    fullWidth
                    id="issueRemark"
                    label={t('Issue Remark')}
                    multiline
                    rows={4}
                    value={formData.issueRemark || ''}
                    onChange={(e) => handleInputChange('issueRemark', e.target.value)}
                    error={!!errors.issueRemark}
                    helperText={errors.issueRemark}
                    //placeholder={t('Describe the issue with bad items')}
                    variant="outlined"
                  />
                </Grid>
                
                <Grid item xs={12}>
                  <FormControl fullWidth error={!!errors.handledBy}>
                    <InputLabel>{t('handler')}</InputLabel>
                    <Select
                      value={formData.handledBy ? formData.handledBy.toString() : ''}
                      onChange={(e) => handleInputChange('handledBy', e.target.value ? parseInt(e.target.value) : undefined)}
                      label={t('handler')}
                    >
                      {handlers.map((handler) => (
                        <MenuItem key={handler.id} value={handler.id.toString()}>
                          {handler.name}
                        </MenuItem>
                      ))}
                    </Select>
                    {errors.handledBy && (
                      <Typography variant="caption" color="error" sx={{ mt: 0.5, ml: 1.75 }}>
                        {errors.handledBy}
                      </Typography>
                    )}
                  </FormControl>
                </Grid>
              </>
            ) : (<></>)}
          </Grid>
        </Box>
      </DialogContent>
      <DialogActions>
        <Button onClick={handleClose} disabled={loading}>
          {t('cancel')}
        </Button>
        <Button 
          onClick={handleSubmit} 
          variant="contained" 
          disabled={loading}
        >
          {loading ? t('submitting') : t('submit')}
        </Button>
      </DialogActions>
    </Dialog>
  );
};

export default PickExecutionForm;