import React, { useState } from 'react';
import { Button, Input } from '../../../ui';
import { AddressAutocomplete } from '../../../ui/AddressAutocomplete';
import { useRegisterBakery } from '../../../../api/hooks/tenant';
import { BakeryRegistration } from '../../../../api/types/tenant';
import { AddressResult } from '../../../../services/api/geocodingApi';
import { useWizardContext } from '../context';
import { poiContextApi } from '../../../../services/api/poiContextApi';

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

export const RegisterTenantStep: React.FC<RegisterTenantStepProps> = ({
  onComplete,
  isFirstStep
}) => {
  const wizardContext = useWizardContext();
  const [formData, setFormData] = useState<BakeryRegistration>({
    name: '',
    address: '',
    postal_code: '',
    phone: '',
    city: 'Madrid',
    business_type: 'bakery',
    business_model: 'individual_bakery'
  });

  const [errors, setErrors] = useState<Record<string, string>>({});
  const registerBakery = useRegisterBakery();

  const handleInputChange = (field: keyof BakeryRegistration, value: string) => {
    setFormData(prev => ({
      ...prev,
      [field]: value
    }));

    if (errors[field]) {
      setErrors(prev => ({
        ...prev,
        [field]: ''
      }));
    }
  };

  const handleAddressSelect = (address: AddressResult) => {
    setFormData(prev => ({
      ...prev,
      address: address.display_name,
      city: address.address.city || address.address.municipality || address.address.suburb || prev.city,
      postal_code: address.address.postcode || prev.postal_code,
    }));
  };

  const handleCoordinatesChange = (lat: number, lon: number) => {
    // Store coordinates in the wizard context immediately
    // This allows the POI detection step to access location information when it's available
    wizardContext.updateLocation({ latitude: lat, longitude: lon });
    console.log('Coordinates captured and stored:', { latitude: lat, longitude: lon });
  };

  const validateForm = () => {
    const newErrors: Record<string, string> = {};

    // Required fields according to backend BakeryRegistration schema
    if (!formData.name.trim()) {
      newErrors.name = 'El nombre de la panadería es obligatorio';
    } else if (formData.name.length < 2 || formData.name.length > 200) {
      newErrors.name = 'El nombre debe tener entre 2 y 200 caracteres';
    }

    if (!formData.address.trim()) {
      newErrors.address = 'La dirección es obligatoria';
    } else if (formData.address.length < 10 || formData.address.length > 500) {
      newErrors.address = 'La dirección debe tener entre 10 y 500 caracteres';
    }

    if (!formData.postal_code.trim()) {
      newErrors.postal_code = 'El código postal es obligatorio';
    } else if (!/^\d{5}$/.test(formData.postal_code)) {
      newErrors.postal_code = 'El código postal debe tener exactamente 5 dígitos';
    }

    if (!formData.phone.trim()) {
      newErrors.phone = 'El número de teléfono es obligatorio';
    } else if (formData.phone.length < 9 || formData.phone.length > 20) {
      newErrors.phone = 'El teléfono debe tener entre 9 y 20 caracteres';
    } else {
      // Basic Spanish phone validation
      const phone = formData.phone.replace(/[\s\-\(\)]/g, '');
      const patterns = [
        /^(\+34|0034|34)?[6789]\d{8}$/, // Mobile
        /^(\+34|0034|34)?9\d{8}$/       // Landline
      ];
      if (!patterns.some(pattern => pattern.test(phone))) {
        newErrors.phone = 'Introduce un número de teléfono español válido';
      }
    }

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

  const handleSubmit = async () => {
    if (!validateForm()) {
      return;
    }

    try {
      const tenant = await registerBakery.mutateAsync(formData);

      // Trigger POI detection in the background (non-blocking)
      // This replaces the removed POI Detection step
      const bakeryLocation = wizardContext.state.bakeryLocation;
      if (bakeryLocation?.latitude && bakeryLocation?.longitude && tenant.id) {
        // Run POI detection asynchronously without blocking the wizard flow
        poiContextApi.detectPOIs(
          tenant.id,
          bakeryLocation.latitude,
          bakeryLocation.longitude,
          false // use_cache = false for initial detection
        ).then((result) => {
          console.log(`✅ POI detection completed automatically for tenant ${tenant.id}:`, result.summary);

          // Phase 3: Handle calendar suggestion if available
          if (result.calendar_suggestion) {
            const suggestion = result.calendar_suggestion;
            console.log(`📊 Calendar suggestion available:`, {
              calendar: suggestion.calendar_name,
              confidence: `${suggestion.confidence_percentage}%`,
              should_auto_assign: suggestion.should_auto_assign
            });

            // Store suggestion in wizard context for later use
            // Frontend can show this in settings or a notification later
            if (suggestion.confidence_percentage >= 75) {
              console.log(`✅ High confidence suggestion: ${suggestion.calendar_name} (${suggestion.confidence_percentage}%)`);
              // TODO: Show notification to admin about high-confidence suggestion
            } else {
              console.log(`📋 Lower confidence suggestion: ${suggestion.calendar_name} (${suggestion.confidence_percentage}%)`);
              // TODO: Store for later review in settings
            }
          }
        }).catch((error) => {
          console.warn('⚠️  Background POI detection failed (non-blocking):', error);
          // This is non-critical, so we don't block the user
        });
      }

      // Update the wizard context with tenant info
      onComplete({
        tenant,
        tenantId: tenant.id,
        bakeryLocation: wizardContext.state.bakeryLocation
      });
    } catch (error) {
      console.error('Error registering bakery:', error);
      setErrors({ submit: 'Error al registrar la panadería. Por favor, inténtalo de nuevo.' });
    }
  };

  return (
    <div className="space-y-4 md:space-y-6">
      <div className="grid grid-cols-1 md:grid-cols-2 gap-4 md:gap-6">
        <Input
          label="Nombre de la Panadería"
          placeholder="Ingresa el nombre de tu panadería"
          value={formData.name}
          onChange={(e) => handleInputChange('name', e.target.value)}
          error={errors.name}
          isRequired
        />

        <Input
          label="Teléfono"
          type="tel"
          placeholder="+34 123 456 789"
          value={formData.phone}
          onChange={(e) => handleInputChange('phone', e.target.value)}
          error={errors.phone}
          isRequired
        />

        <div className="md:col-span-2">
          <label className="block text-sm font-medium text-gray-700 mb-1">
            Dirección <span className="text-red-500">*</span>
          </label>
          <AddressAutocomplete
            value={formData.address}
            placeholder="Enter bakery address..."
            onAddressSelect={(address) => {
              console.log('Selected:', address.display_name);
              handleAddressSelect(address);
            }}
            onCoordinatesChange={handleCoordinatesChange}
            countryCode="es"
            required
          />
          {errors.address && (
            <div className="mt-1 text-sm text-red-600">
              {errors.address}
            </div>
          )}
        </div>

        <Input
          label="Código Postal"
          placeholder="28001"
          value={formData.postal_code}
          onChange={(e) => handleInputChange('postal_code', e.target.value)}
          error={errors.postal_code}
          isRequired
          maxLength={5}
        />

        <Input
          label="Ciudad (Opcional)"
          placeholder="Madrid"
          value={formData.city}
          onChange={(e) => handleInputChange('city', e.target.value)}
          error={errors.city}
        />
      </div>

      {errors.submit && (
        <div className="text-[var(--color-error)] text-sm bg-[var(--color-error)]/10 p-3 rounded-lg">
          {errors.submit}
        </div>
      )}

      <div className="flex justify-end">
        <Button
          onClick={handleSubmit}
          isLoading={registerBakery.isPending}
          loadingText="Registrando..."
          size="lg"
        >
          Crear Panadería y Continuar
        </Button>
      </div>
    </div>
  );
};