import React, { useState, useRef } from 'react';
import { useTranslation } from 'react-i18next';
import { Button } from '../../../ui/Button';
import { useCurrentTenant } from '../../../../stores/tenant.store';
import { useCreateIngredient, useClassifyBatch } from '../../../../api/hooks/inventory';
import { useValidateImportFile, useImportSalesData } from '../../../../api/hooks/sales';
import type { ImportValidationResponse } from '../../../../api/types/dataImport';
import type { ProductSuggestionResponse } from '../../../../api/types/inventory';
import { useAuth } from '../../../../contexts/AuthContext';
import { BatchAddIngredientsModal } from '../../inventory/BatchAddIngredientsModal';

interface UploadSalesDataStepProps {
  onNext: () => void;
  onPrevious: () => void;
  onComplete: (data?: any) => void;
  isFirstStep: boolean;
  isLastStep: boolean;
}

interface ProgressState {
  stage: string;
  progress: number;
  message: string;
}

interface InventoryItemForm {
  id: string; // Unique ID for UI tracking
  name: string;
  product_type: string;
  category: string;
  unit_of_measure: string;
  stock_quantity: number;
  cost_per_unit: number;
  estimated_shelf_life_days: number;
  requires_refrigeration: boolean;
  requires_freezing: boolean;
  is_seasonal: boolean;
  low_stock_threshold: number;
  reorder_point: number;
  notes: string;
  // AI suggestion metadata (if from AI)
  isSuggested: boolean;
  confidence_score?: number;
  sales_data?: {
    total_quantity: number;
    average_daily_sales: number;
  };
}

export const UploadSalesDataStep: React.FC<UploadSalesDataStepProps> = ({
  onComplete,
  isFirstStep
}) => {
  const { t } = useTranslation();
  const [selectedFile, setSelectedFile] = useState<File | null>(null);
  const [isValidating, setIsValidating] = useState(false);
  const [validationResult, setValidationResult] = useState<ImportValidationResponse | null>(null);
  const [inventoryItems, setInventoryItems] = useState<InventoryItemForm[]>([]);
  const [showInventoryStep, setShowInventoryStep] = useState(false);
  const [error, setError] = useState<string>('');
  const [progressState, setProgressState] = useState<ProgressState | null>(null);
  const [showGuide, setShowGuide] = useState(false);
  const fileInputRef = useRef<HTMLInputElement>(null);

  // Form state for adding/editing
  const [isAdding, setIsAdding] = useState(false);
  const [editingId, setEditingId] = useState<string | null>(null);
  const [showBatchModal, setShowBatchModal] = useState(false);
  const [formData, setFormData] = useState<InventoryItemForm>({
    id: '',
    name: '',
    product_type: 'ingredient',
    category: '',
    unit_of_measure: 'kg',
    stock_quantity: 0,
    cost_per_unit: 0,
    estimated_shelf_life_days: 30,
    requires_refrigeration: false,
    requires_freezing: false,
    is_seasonal: false,
    low_stock_threshold: 0,
    reorder_point: 0,
    notes: '',
    isSuggested: false,
  });
  const [formErrors, setFormErrors] = useState<Record<string, string>>({});

  const currentTenant = useCurrentTenant();
  const { user } = useAuth();
  const validateFileMutation = useValidateImportFile();
  const createIngredient = useCreateIngredient();
  const importMutation = useImportSalesData();
  const classifyBatchMutation = useClassifyBatch();

  const handleFileSelect = async (event: React.ChangeEvent<HTMLInputElement>) => {
    const file = event.target.files?.[0];
    if (file) {
      setSelectedFile(file);
      setValidationResult(null);
      setError('');
      await handleAutoValidateAndClassify(file);
    }
  };

  const handleDrop = async (event: React.DragEvent<HTMLDivElement>) => {
    event.preventDefault();
    const file = event.dataTransfer.files[0];
    if (file) {
      setSelectedFile(file);
      setValidationResult(null);
      setError('');
      await handleAutoValidateAndClassify(file);
    }
  };

  const handleDragOver = (event: React.DragEvent<HTMLDivElement>) => {
    event.preventDefault();
  };

  const handleAutoValidateAndClassify = async (file: File) => {
    if (!currentTenant?.id) return;

    setIsValidating(true);
    setError('');
    setProgressState({ stage: 'preparing', progress: 0, message: 'Preparando validación automática del archivo...' });

    try {
      // Step 1: Validate the file
      const validationResult = await validateFileMutation.mutateAsync({
        tenantId: currentTenant.id,
        file
      });

      if (validationResult && validationResult.is_valid !== undefined) {
        setValidationResult(validationResult);
        setProgressState({ stage: 'analyzing', progress: 60, message: 'Validación exitosa. Generando sugerencias automáticamente...' });
        await generateInventorySuggestionsAuto(validationResult);
      } else {
        setError('Respuesta de validación inválida del servidor');
        setProgressState(null);
        setIsValidating(false);
      }
    } catch (error) {
      setError('Error validando archivo: ' + (error instanceof Error ? error.message : 'Error desconocido'));
      setProgressState(null);
      setIsValidating(false);
    }
  };

  const generateInventorySuggestionsAuto = async (validationData: ImportValidationResponse) => {
    if (!currentTenant?.id) {
      setError('No hay datos de validación disponibles para generar sugerencias');
      setIsValidating(false);
      setProgressState(null);
      return;
    }

    try {
      setProgressState({ stage: 'analyzing', progress: 65, message: 'Analizando productos de ventas...' });

      const products = validationData.product_list?.map((productName: string) => ({
        product_name: productName
      })) || [];

      if (products.length === 0) {
        setError('No se encontraron productos en los datos de ventas');
        setProgressState(null);
        setIsValidating(false);
        return;
      }

      setProgressState({ stage: 'classifying', progress: 75, message: 'Clasificando productos con IA...' });

      const classificationResponse = await classifyBatchMutation.mutateAsync({
        tenantId: currentTenant.id,
        products
      });

      setProgressState({ stage: 'preparing', progress: 90, message: 'Preparando sugerencias de inventario...' });

      // Convert AI suggestions to inventory items (NOT created yet, just added to list)
      const items: InventoryItemForm[] = classificationResponse.suggestions.map((suggestion: ProductSuggestionResponse, index: number) => {
        const defaultStock = Math.max(
          Math.ceil((suggestion.sales_data?.average_daily_sales || 1) * 7),
          1
        );
        const estimatedCost = suggestion.category === 'Dairy' ? 5.0 :
                             suggestion.category === 'Baking Ingredients' ? 2.0 : 3.0;
        const minimumStock = Math.max(1, Math.ceil(defaultStock * 0.2));
        const reorderPoint = Math.max(minimumStock + 2, Math.ceil(defaultStock * 0.3), minimumStock + 1);

        return {
          id: `ai-${index}-${Date.now()}`,
          name: suggestion.suggested_name,
          product_type: suggestion.product_type,
          category: suggestion.category,
          unit_of_measure: suggestion.unit_of_measure,
          stock_quantity: defaultStock,
          cost_per_unit: estimatedCost,
          estimated_shelf_life_days: suggestion.estimated_shelf_life_days || 30,
          requires_refrigeration: suggestion.requires_refrigeration,
          requires_freezing: suggestion.requires_freezing,
          is_seasonal: suggestion.is_seasonal,
          low_stock_threshold: minimumStock,
          reorder_point: reorderPoint,
          notes: `AI generado - Confianza: ${Math.round(suggestion.confidence_score * 100)}%`,
          isSuggested: true,
          confidence_score: suggestion.confidence_score,
          sales_data: suggestion.sales_data ? {
            total_quantity: suggestion.sales_data.total_quantity,
            average_daily_sales: suggestion.sales_data.average_daily_sales,
          } : undefined,
        };
      });

      setInventoryItems(items);
      setShowInventoryStep(true);
      setProgressState(null);
      setIsValidating(false);
    } catch (err) {
      console.error('Error generating inventory suggestions:', err);
      setError('Error al generar sugerencias de inventario. Por favor, inténtalo de nuevo.');
      setProgressState(null);
      setIsValidating(false);
    }
  };

  // Form validation
  const validateForm = (): boolean => {
    const newErrors: Record<string, string> = {};

    if (!formData.name.trim()) {
      newErrors.name = 'El nombre es requerido';
    }
    if (!formData.category.trim()) {
      newErrors.category = 'La categoría es requerida';
    }
    if (formData.stock_quantity < 0) {
      newErrors.stock_quantity = 'El stock debe ser 0 o mayor';
    }
    if (formData.cost_per_unit < 0) {
      newErrors.cost_per_unit = 'El costo debe ser 0 o mayor';
    }
    if (formData.estimated_shelf_life_days <= 0) {
      newErrors.estimated_shelf_life_days = 'Los días de caducidad deben ser mayores a 0';
    }

    setFormErrors(newErrors);
    return Object.keys(newErrors).length === 0;
  };

  // Add or update item in list
  const handleSubmitForm = (e: React.FormEvent) => {
    e.preventDefault();
    if (!validateForm()) return;

    if (editingId) {
      // Update existing item
      setInventoryItems(items =>
        items.map(item =>
          item.id === editingId ? { ...formData, id: editingId } : item
        )
      );
      setEditingId(null);
    } else {
      // Add new item
      const newItem: InventoryItemForm = {
        ...formData,
        id: `manual-${Date.now()}`,
        isSuggested: false,
      };
      setInventoryItems(items => [...items, newItem]);
    }

    resetForm();
  };

  const resetForm = () => {
    setFormData({
      id: '',
      name: '',
      product_type: 'ingredient',
      category: '',
      unit_of_measure: 'kg',
      stock_quantity: 0,
      cost_per_unit: 0,
      estimated_shelf_life_days: 30,
      requires_refrigeration: false,
      requires_freezing: false,
      is_seasonal: false,
      low_stock_threshold: 0,
      reorder_point: 0,
      notes: '',
      isSuggested: false,
    });
    setFormErrors({});
    setIsAdding(false);
    setEditingId(null);
  };

  const handleEdit = (item: InventoryItemForm) => {
    setFormData(item);
    setEditingId(item.id);
    setIsAdding(true);
  };

  const handleDelete = (itemId: string) => {
    if (!window.confirm('¿Estás seguro de que quieres eliminar este ingrediente de la lista?')) {
      return;
    }
    setInventoryItems(items => items.filter(item => item.id !== itemId));
  };

  // Create all inventory items when Next is clicked
  const handleNext = async () => {
    if (inventoryItems.length === 0) {
      setError('Por favor agrega al menos un ingrediente antes de continuar');
      return;
    }

    if (!currentTenant?.id) {
      setError('No se encontró información del tenant');
      return;
    }

    setProgressState({
      stage: 'creating_inventory',
      progress: 10,
      message: `Creando ${inventoryItems.length} ingredientes...`
    });

    try {
      // Create all ingredients in parallel
      const creationPromises = inventoryItems.map(item => {
        const ingredientData = {
          name: item.name,
          product_type: item.product_type,
          category: item.category,
          unit_of_measure: item.unit_of_measure,
          low_stock_threshold: item.low_stock_threshold,
          max_stock_level: item.stock_quantity * 2,
          reorder_point: item.reorder_point,
          shelf_life_days: item.estimated_shelf_life_days,
          requires_refrigeration: item.requires_refrigeration,
          requires_freezing: item.requires_freezing,
          is_seasonal: item.is_seasonal,
          average_cost: item.cost_per_unit,
          notes: item.notes || undefined,
        };

        return createIngredient.mutateAsync({
          tenantId: currentTenant.id,
          ingredientData
        }).then(created => ({
          ...created,
          initialStock: item.stock_quantity
        }));
      });

      const results = await Promise.allSettled(creationPromises);

      const createdIngredients = results
        .filter(r => r.status === 'fulfilled')
        .map(r => (r as PromiseFulfilledResult<any>).value);

      const failedCount = results.filter(r => r.status === 'rejected').length;

      if (failedCount > 0) {
        console.warn(`${failedCount} ingredientes fallaron al crear de ${inventoryItems.length}`);
      }

      console.log(`Creados exitosamente ${createdIngredients.length} ingredientes`);

      // Import sales data if available
      setProgressState({
        stage: 'importing_sales',
        progress: 50,
        message: 'Importando datos de ventas...'
      });

      let salesImportResult = null;
      try {
        if (selectedFile) {
          const result = await importMutation.mutateAsync({
            tenantId: currentTenant.id,
            file: selectedFile
          });
          salesImportResult = result;
          if (result.success) {
            console.log('Datos de ventas importados exitosamente');
          }
        }
      } catch (importError) {
        console.error('Error importando datos de ventas:', importError);
      }

      setProgressState(null);

      // Complete step
      onComplete({
        createdIngredients,
        totalItems: createdIngredients.length,
        validationResult,
        file: selectedFile,
        salesImportResult,
        inventoryConfigured: true,
        shouldAutoCompleteSuppliers: true,
        userId: user?.id
      });
    } catch (err) {
      console.error('Error creando ingredientes:', err);
      setError('Error al crear ingredientes. Por favor, inténtalo de nuevo.');
      setProgressState(null);
    }
  };

  const formatFileSize = (bytes: number) => {
    if (bytes === 0) return '0 Bytes';
    const k = 1024;
    const sizes = ['Bytes', 'KB', 'MB', 'GB'];
    const i = Math.floor(Math.log(bytes) / Math.log(k));
    return parseFloat((bytes / Math.pow(k, i)).toFixed(2)) + ' ' + sizes[i];
  };

  const categoryOptions = [
    'Baking Ingredients',
    'Dairy',
    'Fruits',
    'Vegetables',
    'Meat',
    'Seafood',
    'Spices',
    'Other'
  ];

  const unitOptions = ['kg', 'g', 'L', 'ml', 'units', 'dozen'];

  // INVENTORY LIST VIEW (after AI suggestions loaded)
  if (showInventoryStep) {
    const canContinue = inventoryItems.length >= 1;

    return (
      <div className="space-y-6">
        {/* Why This Matters */}
        <div className="bg-[var(--color-info)]/10 border border-[var(--color-info)]/20 rounded-lg p-4">
          <h3 className="font-semibold text-[var(--text-primary)] mb-2 flex items-center gap-2">
            <svg className="w-5 h-5 text-[var(--color-info)]" fill="none" stroke="currentColor" viewBox="0 0 24 24">
              <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={2} d="M13 16h-1v-4h-1m1-4h.01M21 12a9 9 0 11-18 0 9 9 0 0118 0z" />
            </svg>
            {t('onboarding:ai_suggestions.why_title', 'Configurar Inventario')}
          </h3>
          <p className="text-sm text-[var(--text-secondary)]">
            Revisa y edita los ingredientes sugeridos por IA. Puedes agregar más ingredientes manualmente. Cuando hagas clic en "Siguiente", se crearán todos los ingredientes.
          </p>
        </div>

        {/* Inventory Items List */}
        <div>
          <h4 className="text-sm font-medium text-[var(--text-secondary)] mb-3">
            Ingredientes ({inventoryItems.length})
          </h4>

          {inventoryItems.length > 0 ? (
            <div className="space-y-3">
              {inventoryItems.map((item) => (
                <div
                  key={item.id}
                  className="p-4 bg-[var(--bg-secondary)] border border-[var(--border-secondary)] rounded-lg"
                >
                  <div className="flex items-start justify-between">
                    <div className="flex-1">
                      <div className="flex items-center gap-2">
                        <h5 className="font-medium text-[var(--text-primary)]">
                          {item.name}
                        </h5>
                        {item.isSuggested && item.confidence_score && (
                          <span className="text-xs bg-[var(--color-info)]/10 text-[var(--color-info)] px-2 py-0.5 rounded-full">
                            IA {Math.round(item.confidence_score * 100)}%
                          </span>
                        )}
                      </div>
                      <p className="text-sm text-[var(--text-secondary)] mt-1">
                        {item.category} • {item.unit_of_measure}
                      </p>
                      <div className="mt-2 flex items-center gap-4 text-xs text-[var(--text-secondary)]">
                        <span>Stock: {item.stock_quantity} {item.unit_of_measure}</span>
                        <span>Costo: €{item.cost_per_unit.toFixed(2)}/{item.unit_of_measure}</span>
                        <span>Caducidad: {item.estimated_shelf_life_days} días</span>
                      </div>
                      {item.sales_data && (
                        <div className="mt-2 text-xs text-[var(--text-tertiary)]">
                          📊 Ventas: {item.sales_data.average_daily_sales.toFixed(1)}/día
                        </div>
                      )}
                    </div>
                    <div className="flex items-center gap-2 ml-4">
                      <button
                        onClick={() => handleEdit(item)}
                        className="p-2 text-[var(--text-secondary)] hover:text-[var(--color-primary)] hover:bg-[var(--bg-primary)] rounded transition-colors"
                        title="Editar"
                      >
                        <svg className="w-4 h-4" fill="none" stroke="currentColor" viewBox="0 0 24 24">
                          <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={2} d="M11 5H6a2 2 0 00-2 2v11a2 2 0 002 2h11a2 2 0 002-2v-5m-1.414-9.414a2 2 0 112.828 2.828L11.828 15H9v-2.828l8.586-8.586z" />
                        </svg>
                      </button>
                      <button
                        onClick={() => handleDelete(item.id)}
                        className="p-2 text-[var(--text-secondary)] hover:text-[var(--color-error)] hover:bg-[var(--color-error)]/10 rounded transition-colors"
                        title="Eliminar"
                      >
                        <svg className="w-4 h-4" fill="none" stroke="currentColor" viewBox="0 0 24 24">
                          <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={2} d="M19 7l-.867 12.142A2 2 0 0116.138 21H7.862a2 2 0 01-1.995-1.858L5 7m5 4v6m4-6v6m1-10V4a1 1 0 00-1-1h-4a1 1 0 00-1 1v3M4 7h16" />
                        </svg>
                      </button>
                    </div>
                  </div>
                </div>
              ))}
            </div>
          ) : (
            <div className="text-center py-8 border border-dashed border-[var(--border-secondary)] rounded-lg">
              <p className="text-[var(--text-tertiary)] text-sm">
                No hay ingredientes en la lista todavía
              </p>
            </div>
          )}
        </div>

        {/* Add/Edit Form */}
        {isAdding ? (
          <div className="border-2 border-[var(--color-primary)] rounded-lg p-4 bg-gradient-to-br from-[var(--color-primary)]/5 to-transparent">
            <h4 className="font-semibold text-[var(--text-primary)] mb-4">
              {editingId ? 'Editar Ingrediente' : 'Agregar Ingrediente Manualmente'}
            </h4>
            <form onSubmit={handleSubmitForm} className="space-y-4">
              <div className="grid grid-cols-1 md:grid-cols-2 gap-4">
                <div>
                  <label className="block text-sm font-medium text-[var(--text-primary)] mb-1">
                    Nombre *
                  </label>
                  <input
                    type="text"
                    value={formData.name}
                    onChange={(e) => setFormData({ ...formData, name: e.target.value })}
                    className="w-full px-3 py-2 bg-[var(--bg-primary)] border border-[var(--border-secondary)] rounded-lg focus:outline-none focus:ring-2 focus:ring-[var(--color-primary)] text-[var(--text-primary)]"
                    placeholder="Ej: Harina de trigo"
                  />
                  {formErrors.name && (
                    <p className="text-xs text-[var(--color-error)] mt-1">{formErrors.name}</p>
                  )}
                </div>

                <div>
                  <label className="block text-sm font-medium text-[var(--text-primary)] mb-1">
                    Categoría *
                  </label>
                  <select
                    value={formData.category}
                    onChange={(e) => setFormData({ ...formData, category: e.target.value })}
                    className="w-full px-3 py-2 bg-[var(--bg-primary)] border border-[var(--border-secondary)] rounded-lg focus:outline-none focus:ring-2 focus:ring-[var(--color-primary)] text-[var(--text-primary)]"
                  >
                    <option value="">Seleccionar...</option>
                    {categoryOptions.map(cat => (
                      <option key={cat} value={cat}>{cat}</option>
                    ))}
                  </select>
                  {formErrors.category && (
                    <p className="text-xs text-[var(--color-error)] mt-1">{formErrors.category}</p>
                  )}
                </div>

                <div>
                  <label className="block text-sm font-medium text-[var(--text-primary)] mb-1">
                    Unidad de Medida
                  </label>
                  <select
                    value={formData.unit_of_measure}
                    onChange={(e) => setFormData({ ...formData, unit_of_measure: e.target.value })}
                    className="w-full px-3 py-2 bg-[var(--bg-primary)] border border-[var(--border-secondary)] rounded-lg focus:outline-none focus:ring-2 focus:ring-[var(--color-primary)] text-[var(--text-primary)]"
                  >
                    {unitOptions.map(unit => (
                      <option key={unit} value={unit}>{unit}</option>
                    ))}
                  </select>
                </div>

                <div>
                  <label className="block text-sm font-medium text-[var(--text-primary)] mb-1">
                    Stock Inicial
                  </label>
                  <input
                    type="number"
                    min="0"
                    step="0.01"
                    value={formData.stock_quantity}
                    onChange={(e) => setFormData({ ...formData, stock_quantity: parseFloat(e.target.value) || 0 })}
                    className="w-full px-3 py-2 bg-[var(--bg-primary)] border border-[var(--border-secondary)] rounded-lg focus:outline-none focus:ring-2 focus:ring-[var(--color-primary)] text-[var(--text-primary)]"
                  />
                  {formErrors.stock_quantity && (
                    <p className="text-xs text-[var(--color-error)] mt-1">{formErrors.stock_quantity}</p>
                  )}
                </div>

                <div>
                  <label className="block text-sm font-medium text-[var(--text-primary)] mb-1">
                    Costo por Unidad (€)
                  </label>
                  <input
                    type="number"
                    min="0"
                    step="0.01"
                    value={formData.cost_per_unit}
                    onChange={(e) => setFormData({ ...formData, cost_per_unit: parseFloat(e.target.value) || 0 })}
                    className="w-full px-3 py-2 bg-[var(--bg-primary)] border border-[var(--border-secondary)] rounded-lg focus:outline-none focus:ring-2 focus:ring-[var(--color-primary)] text-[var(--text-primary)]"
                  />
                  {formErrors.cost_per_unit && (
                    <p className="text-xs text-[var(--color-error)] mt-1">{formErrors.cost_per_unit}</p>
                  )}
                </div>

                <div>
                  <label className="block text-sm font-medium text-[var(--text-primary)] mb-1">
                    Días de Caducidad
                  </label>
                  <input
                    type="number"
                    min="1"
                    value={formData.estimated_shelf_life_days}
                    onChange={(e) => setFormData({ ...formData, estimated_shelf_life_days: parseInt(e.target.value) || 30 })}
                    className="w-full px-3 py-2 bg-[var(--bg-primary)] border border-[var(--border-secondary)] rounded-lg focus:outline-none focus:ring-2 focus:ring-[var(--color-primary)] text-[var(--text-primary)]"
                  />
                  {formErrors.estimated_shelf_life_days && (
                    <p className="text-xs text-[var(--color-error)] mt-1">{formErrors.estimated_shelf_life_days}</p>
                  )}
                </div>

                <div>
                  <label className="block text-sm font-medium text-[var(--text-primary)] mb-1">
                    Stock Mínimo
                  </label>
                  <input
                    type="number"
                    min="0"
                    value={formData.low_stock_threshold}
                    onChange={(e) => setFormData({ ...formData, low_stock_threshold: parseInt(e.target.value) || 0 })}
                    className="w-full px-3 py-2 bg-[var(--bg-primary)] border border-[var(--border-secondary)] rounded-lg focus:outline-none focus:ring-2 focus:ring-[var(--color-primary)] text-[var(--text-primary)]"
                  />
                </div>

                <div>
                  <label className="block text-sm font-medium text-[var(--text-primary)] mb-1">
                    Punto de Reorden
                  </label>
                  <input
                    type="number"
                    min="0"
                    value={formData.reorder_point}
                    onChange={(e) => setFormData({ ...formData, reorder_point: parseInt(e.target.value) || 0 })}
                    className="w-full px-3 py-2 bg-[var(--bg-primary)] border border-[var(--border-secondary)] rounded-lg focus:outline-none focus:ring-2 focus:ring-[var(--color-primary)] text-[var(--text-primary)]"
                  />
                </div>
              </div>

              <div className="flex items-center gap-4">
                <label className="flex items-center gap-2 text-sm text-[var(--text-primary)]">
                  <input
                    type="checkbox"
                    checked={formData.requires_refrigeration}
                    onChange={(e) => setFormData({ ...formData, requires_refrigeration: e.target.checked })}
                    className="rounded"
                  />
                  Requiere Refrigeración
                </label>
                <label className="flex items-center gap-2 text-sm text-[var(--text-primary)]">
                  <input
                    type="checkbox"
                    checked={formData.requires_freezing}
                    onChange={(e) => setFormData({ ...formData, requires_freezing: e.target.checked })}
                    className="rounded"
                  />
                  Requiere Congelación
                </label>
                <label className="flex items-center gap-2 text-sm text-[var(--text-primary)]">
                  <input
                    type="checkbox"
                    checked={formData.is_seasonal}
                    onChange={(e) => setFormData({ ...formData, is_seasonal: e.target.checked })}
                    className="rounded"
                  />
                  Estacional
                </label>
              </div>

              <div>
                <label className="block text-sm font-medium text-[var(--text-primary)] mb-1">
                  Notas (opcional)
                </label>
                <textarea
                  value={formData.notes}
                  onChange={(e) => setFormData({ ...formData, notes: e.target.value })}
                  rows={2}
                  className="w-full px-3 py-2 bg-[var(--bg-primary)] border border-[var(--border-secondary)] rounded-lg focus:outline-none focus:ring-2 focus:ring-[var(--color-primary)] text-[var(--text-primary)]"
                  placeholder="Información adicional..."
                />
              </div>

              <div className="flex gap-2 pt-2">
                <button
                  type="submit"
                  className="px-4 py-2 bg-[var(--color-primary)] text-white rounded-lg hover:bg-[var(--color-primary-dark)] transition-colors font-medium"
                >
                  {editingId ? 'Guardar Cambios' : 'Agregar a Lista'}
                </button>
                <button
                  type="button"
                  onClick={resetForm}
                  className="px-4 py-2 text-[var(--text-secondary)] hover:text-[var(--text-primary)] hover:bg-[var(--bg-primary)] rounded-lg transition-colors"
                >
                  Cancelar
                </button>
              </div>
            </form>
          </div>
        ) : (
          <div className="grid grid-cols-2 gap-3">
            <button
              type="button"
              onClick={() => setIsAdding(true)}
              className="p-4 border-2 border-dashed border-[var(--border-secondary)] rounded-lg hover:border-[var(--color-primary)] hover:bg-[var(--bg-secondary)] transition-colors group"
            >
              <div className="flex items-center justify-center gap-2 text-[var(--text-secondary)] group-hover:text-[var(--color-primary)]">
                <svg className="w-5 h-5" fill="none" stroke="currentColor" viewBox="0 0 24 24">
                  <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={2} d="M12 6v6m0 0v6m0-6h6m-6 0H6" />
                </svg>
                <span className="font-medium">
                  Agregar Uno
                </span>
              </div>
            </button>
            <button
              type="button"
              onClick={() => setShowBatchModal(true)}
              className="p-4 border-2 border-dashed border-[var(--color-primary)]/30 rounded-lg hover:border-[var(--color-primary)] hover:bg-[var(--color-primary)]/5 transition-colors group"
            >
              <div className="flex items-center justify-center gap-2 text-[var(--color-primary)]">
                <svg className="w-5 h-5" fill="none" stroke="currentColor" viewBox="0 0 24 24">
                  <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={2} d="M9 12h6m-6 4h6m2 5H7a2 2 0 01-2-2V5a2 2 0 012-2h5.586a1 1 0 01.707.293l5.414 5.414a1 1 0 01.293.707V19a2 2 0 01-2 2z" />
                </svg>
                <span className="font-medium">
                  Agregar Varios
                </span>
              </div>
            </button>
          </div>
        )}

        {error && (
          <div className="bg-[var(--color-error)]/10 border border-[var(--color-error)]/20 rounded-lg p-4">
            <p className="text-[var(--color-error)]">{error}</p>
          </div>
        )}

        {/* Progress during creation */}
        {progressState && (
          <div className="bg-[var(--bg-secondary)] rounded-lg p-4">
            <div className="flex justify-between text-sm mb-2">
              <span className="font-medium">{progressState.message}</span>
              <span>{progressState.progress}%</span>
            </div>
            <div className="w-full bg-[var(--bg-tertiary)] rounded-full h-2">
              <div
                className="bg-[var(--color-primary)] h-2 rounded-full transition-all duration-300"
                style={{ width: `${progressState.progress}%` }}
              />
            </div>
          </div>
        )}

        {/* Navigation - Show Next button when minimum requirement met */}
        {!isAdding && (
          <div className="flex items-center justify-between pt-6 border-t border-[var(--border-secondary)] mt-6">
            <div className="flex items-center gap-2">
              {canContinue ? (
                <div className="flex items-center gap-2 text-sm text-[var(--color-success)]">
                  <svg className="w-5 h-5" fill="none" stroke="currentColor" viewBox="0 0 24 24">
                    <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={2} d="M9 12l2 2 4-4m6 2a9 9 0 11-18 0 9 9 0 0118 0z" />
                  </svg>
                  <span>
                    {inventoryItems.length} ingrediente(s) - ¡Listo para continuar!
                  </span>
                </div>
              ) : (
                <p className="text-sm text-[var(--color-warning)]">
                  Agrega al menos 1 ingrediente para continuar
                </p>
              )}
            </div>
            <button
              onClick={handleNext}
              disabled={!canContinue || !!progressState}
              className="px-6 py-2.5 bg-[var(--color-primary)] text-white rounded-lg hover:bg-[var(--color-primary-dark)] disabled:opacity-50 disabled:cursor-not-allowed transition-colors font-medium flex items-center gap-2"
            >
              {progressState ? 'Creando...' : 'Siguiente'}
              →
            </button>
          </div>
        )}

        {/* Batch Add Modal */}
        <BatchAddIngredientsModal
          isOpen={showBatchModal}
          onClose={() => setShowBatchModal(false)}
          onCreated={(ingredients) => {
            // Add all created ingredients to the list
            const newItems: InventoryItemForm[] = ingredients.map(ing => ({
              id: ing.id,
              name: ing.name,
              product_type: ing.product_type,
              category: ing.category,
              unit_of_measure: ing.unit_of_measure,
              stock_quantity: 0,
              cost_per_unit: ing.average_cost || 0,
              estimated_shelf_life_days: ing.shelf_life_days || 30,
              requires_refrigeration: ing.requires_refrigeration || false,
              requires_freezing: ing.requires_freezing || false,
              is_seasonal: ing.is_seasonal || false,
              low_stock_threshold: ing.low_stock_threshold || 0,
              reorder_point: ing.reorder_point || 0,
              notes: ing.notes || '',
              isSuggested: false,
            }));
            setInventoryItems([...inventoryItems, ...newItems]);
            setShowBatchModal(false);
          }}
          tenantId={currentTenant?.id || ''}
        />
      </div>
    );
  }

  // FILE UPLOAD VIEW (initial step)
  return (
    <div className="space-y-6">
      <div className="text-center">
        <p className="text-[var(--text-secondary)] mb-6">
          Sube tus datos de ventas (formato CSV o JSON) y automáticamente validaremos y generaremos sugerencias de inventario inteligentes.
        </p>
      </div>

      {/* File Format Guide */}
      <div className="bg-[var(--color-info)]/10 border border-[var(--color-info)]/20 rounded-lg p-4">
        <div className="flex items-start justify-between">
          <div className="flex items-center gap-2 mb-2">
            <svg className="w-5 h-5 text-[var(--color-info)]" fill="none" stroke="currentColor" viewBox="0 0 24 24">
              <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={2} d="M13 16h-1v-4h-1m1-4h.01M21 12a9 9 0 11-18 0 9 9 0 0118 0z" />
            </svg>
            <h3 className="font-semibold text-[var(--text-primary)]">
              {t('onboarding:steps.inventory_setup.file_format_guide.title', 'Guía de Formato de Archivo')}
            </h3>
          </div>
          <button
            onClick={() => setShowGuide(!showGuide)}
            className="text-[var(--color-info)] hover:text-[var(--color-primary)] text-sm font-medium"
          >
            {showGuide ? 'Ocultar Guía' : 'Ver Guía Completa'}
          </button>
        </div>

        <div className="text-sm text-[var(--text-secondary)] space-y-1">
          <p>
            <strong className="text-[var(--text-primary)]">Formatos Soportados:</strong>{' '}
            CSV, JSON, Excel (XLSX) • Tamaño máximo: 10MB
          </p>
          <p>
            <strong className="text-[var(--text-primary)]">Columnas Requeridas:</strong>{' '}
            Fecha, Nombre del Producto, Cantidad Vendida
          </p>
        </div>

        {showGuide && (
          <div className="mt-4 pt-4 border-t border-[var(--border-secondary)] space-y-3 text-sm text-[var(--text-secondary)]">
            <p>✓ Detección multiidioma de columnas</p>
            <p>✓ Validación automática con reporte detallado</p>
            <p>✓ Clasificación de productos con IA</p>
            <p>✓ Sugerencias inteligentes de inventario</p>
          </div>
        )}
      </div>

      {/* File Upload Area */}
      <div
        className={`border-2 border-dashed rounded-lg p-8 text-center transition-colors ${
          selectedFile
            ? 'border-[var(--color-success)] bg-[var(--color-success)]/5'
            : 'border-[var(--border-secondary)] hover:border-[var(--color-primary)] hover:bg-[var(--color-primary)]/5'
        }`}
        onDrop={handleDrop}
        onDragOver={handleDragOver}
      >
        <input
          ref={fileInputRef}
          type="file"
          accept=".csv,.json"
          onChange={handleFileSelect}
          className="hidden"
        />

        {selectedFile ? (
          <div className="space-y-4">
            <div className="text-[var(--color-success)]">
              <svg className="mx-auto h-12 w-12 mb-4" fill="none" stroke="currentColor" viewBox="0 0 24 24">
                <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={2} d="M9 12l2 2 4-4m6 2a9 9 0 11-18 0 9 9 0 0118 0z" />
              </svg>
              <p className="text-lg font-medium">Archivo Seleccionado</p>
              <p className="text-[var(--text-secondary)]">{selectedFile.name}</p>
              <p className="text-sm text-[var(--text-tertiary)]">
                {formatFileSize(selectedFile.size)}
              </p>
            </div>
            <Button
              variant="outline"
              onClick={() => fileInputRef.current?.click()}
            >
              Elegir Archivo Diferente
            </Button>
          </div>
        ) : (
          <div className="space-y-4">
            <svg className="mx-auto h-12 w-12 text-[var(--text-tertiary)]" stroke="currentColor" fill="none" viewBox="0 0 48 48">
              <path d="M28 8H12a4 4 0 00-4 4v20m32-12v8m0 0v8a4 4 0 01-4 4H12a4 4 0 01-4-4v-4m32-4l-3.172-3.172a4 4 0 00-5.656 0L28 28M8 32l9.172-9.172a4 4 0 015.656 0L28 28m0 0l4 4m4-24h8m-4-4v8m-12 4h.02" strokeWidth={2} strokeLinecap="round" strokeLinejoin="round" />
            </svg>
            <div>
              <p className="text-lg font-medium">Arrastra tus datos de ventas aquí</p>
              <p className="text-[var(--text-secondary)]">o haz clic para seleccionar archivos</p>
              <p className="text-sm text-[var(--text-tertiary)] mt-2">
                Formatos soportados: CSV, JSON (máx 100MB)<br/>
                <span className="text-[var(--color-primary)]">Validación y sugerencias automáticas</span>
              </p>
            </div>
            <Button
              variant="outline"
              onClick={() => fileInputRef.current?.click()}
            >
              Elegir Archivo
            </Button>
          </div>
        )}
      </div>

      {/* Progress */}
      {progressState && (
        <div className="bg-[var(--bg-secondary)] rounded-lg p-4">
          <div className="flex justify-between text-sm mb-2">
            <span className="font-medium">{progressState.message}</span>
            <span>{progressState.progress}%</span>
          </div>
          <div className="w-full bg-[var(--bg-tertiary)] rounded-full h-2">
            <div
              className="bg-[var(--color-primary)] h-2 rounded-full transition-all duration-300"
              style={{ width: `${progressState.progress}%` }}
            />
          </div>
        </div>
      )}

      {/* Validation Results */}
      {validationResult && (
        <div className="bg-[var(--color-success)]/10 border border-[var(--color-success)]/20 rounded-lg p-4">
          <h3 className="font-semibold text-[var(--color-success)] mb-2">¡Validación Exitosa!</h3>
          <div className="space-y-2 text-sm">
            <p>Registros totales: {validationResult.total_records}</p>
            <p>Registros válidos: {validationResult.valid_records}</p>
            {validationResult.invalid_records > 0 && (
              <p className="text-[var(--color-warning)]">
                Registros inválidos: {validationResult.invalid_records}
              </p>
            )}
          </div>
        </div>
      )}

      {/* Error */}
      {error && (
        <div className="bg-[var(--color-error)]/10 border border-[var(--color-error)]/20 rounded-lg p-4">
          <p className="text-[var(--color-error)]">{error}</p>
        </div>
      )}

      {/* Status indicator */}
      {selectedFile && !showInventoryStep && (
        <div className="flex items-center justify-center px-4 py-2 bg-[var(--bg-secondary)] rounded-lg">
          {isValidating ? (
            <>
              <div className="animate-spin rounded-full h-4 w-4 border-b-2 border-[var(--color-primary)] mr-2"></div>
              <span className="text-sm text-[var(--text-secondary)]">Procesando automáticamente...</span>
            </>
          ) : validationResult ? (
            <>
              <svg className="w-4 h-4 text-[var(--color-success)] mr-2" fill="none" stroke="currentColor" viewBox="0 0 24 24">
                <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={2} d="M5 13l4 4L19 7" />
              </svg>
              <span className="text-sm text-[var(--color-success)]">Archivo procesado exitosamente</span>
            </>
          ) : null}
        </div>
      )}
    </div>
  );
};