/**
 * CSV Booking Creation Page
 *
 * Multi-step form for creating a CSV-based booking request
 */

'use client';

import { useState, useEffect, Suspense } from 'react';
import { useRouter, useSearchParams } from 'next/navigation';
import type { CsvRateSearchResult } from '@/types/rates';
import { createCsvBooking } from '@/lib/api/bookings';

interface BookingForm {
  // Rate data (pre-filled from search results)
  carrierName: string;
  carrierEmail: string;
  origin: string;
  destination: string;
  volumeCBM: number;
  weightKG: number;
  palletCount: number;
  priceUSD: number;
  priceEUR: number;
  primaryCurrency: 'USD' | 'EUR';
  transitDays: number;
  containerType: string;

  // Documents to upload
  documents: File[];

  // Optional notes
  notes?: string;
}

const DOCUMENT_TYPES = [
  { value: 'BILL_OF_LADING', label: 'Bill of Lading (Connaissement)' },
  { value: 'PACKING_LIST', label: 'Packing List (Liste de colisage)' },
  { value: 'COMMERCIAL_INVOICE', label: 'Commercial Invoice (Facture commerciale)' },
  { value: 'CERTIFICATE_OF_ORIGIN', label: 'Certificate of Origin (Certificat d\'origine)' },
  { value: 'OTHER', label: 'Autre document' },
];

const MAX_FILE_SIZE = 5 * 1024 * 1024; // 5MB
const ACCEPTED_FILE_TYPES = ['.pdf', '.doc', '.docx', '.jpg', '.jpeg', '.png'];

function NewBookingPageContent() {
  const router = useRouter();
  const searchParams = useSearchParams();
  const [currentStep, setCurrentStep] = useState(1);
  const [isSubmitting, setIsSubmitting] = useState(false);
  const [error, setError] = useState<string | null>(null);

  const [formData, setFormData] = useState<BookingForm>({
    carrierName: '',
    carrierEmail: '',
    origin: '',
    destination: '',
    volumeCBM: 0,
    weightKG: 0,
    palletCount: 0,
    priceUSD: 0,
    priceEUR: 0,
    primaryCurrency: 'EUR',
    transitDays: 0,
    containerType: '',
    documents: [],
    notes: '',
  });

  // Load rate data from URL params
  useEffect(() => {
    const rateDataParam = searchParams.get('rateData');
    if (rateDataParam) {
      try {
        const rateData: CsvRateSearchResult = JSON.parse(decodeURIComponent(rateDataParam));
        setFormData(prev => ({
          ...prev,
          carrierName: rateData.companyName,
          carrierEmail: rateData.companyEmail,
          origin: rateData.origin,
          destination: rateData.destination,
          volumeCBM: parseFloat(searchParams.get('volumeCBM') || '0'),
          weightKG: parseFloat(searchParams.get('weightKG') || '0'),
          palletCount: parseInt(searchParams.get('palletCount') || '0'),
          priceUSD: rateData.priceUSD,
          priceEUR: rateData.priceEUR,
          primaryCurrency: rateData.primaryCurrency as 'USD' | 'EUR',
          transitDays: rateData.transitDays,
          containerType: rateData.containerType,
        }));
      } catch (err) {
        console.error('Failed to parse rate data:', err);
        setError('Données de tarif invalides');
      }
    } else {
      // No rate data - redirect back to search
      router.push('/dashboard/search-advanced');
    }
  }, [searchParams, router]);

  const handleFileChange = (files: FileList | null) => {
    if (!files) return;

    const newFiles: File[] = [];
    const errors: string[] = [];

    Array.from(files).forEach(file => {
      // Check file size
      if (file.size > MAX_FILE_SIZE) {
        errors.push(`${file.name}: Fichier trop volumineux (max 5MB)`);
        return;
      }

      // Check file type
      const fileExtension = '.' + file.name.split('.').pop()?.toLowerCase();
      if (!ACCEPTED_FILE_TYPES.includes(fileExtension)) {
        errors.push(`${file.name}: Type de fichier non accepté`);
        return;
      }

      newFiles.push(file);
    });

    if (errors.length > 0) {
      setError(errors.join('\n'));
    } else {
      setError(null);
    }

    setFormData(prev => ({
      ...prev,
      documents: [...prev.documents, ...newFiles],
    }));
  };

  const removeDocument = (index: number) => {
    setFormData(prev => ({
      ...prev,
      documents: prev.documents.filter((_, i) => i !== index),
    }));
  };

  const handleSubmit = async () => {
    setIsSubmitting(true);
    setError(null);

    try {
      // Create FormData for multipart upload
      const formDataToSend = new FormData();

      // Append all booking data
      formDataToSend.append('carrierName', formData.carrierName);
      formDataToSend.append('carrierEmail', formData.carrierEmail);
      formDataToSend.append('origin', formData.origin);
      formDataToSend.append('destination', formData.destination);
      formDataToSend.append('volumeCBM', formData.volumeCBM.toString());
      formDataToSend.append('weightKG', formData.weightKG.toString());
      formDataToSend.append('palletCount', formData.palletCount.toString());
      formDataToSend.append('priceUSD', formData.priceUSD.toString());
      formDataToSend.append('priceEUR', formData.priceEUR.toString());
      formDataToSend.append('primaryCurrency', formData.primaryCurrency);
      formDataToSend.append('transitDays', formData.transitDays.toString());
      formDataToSend.append('containerType', formData.containerType);

      if (formData.notes) {
        formDataToSend.append('notes', formData.notes);
      }

      // Append documents
      formData.documents.forEach((file) => {
        formDataToSend.append('documents', file);
      });

      // Send to API using client function
      const result = await createCsvBooking(formDataToSend);

      // Redirect to success page
      router.push(`/dashboard/bookings?success=true&id=${result.id}`);
    } catch (err) {
      console.error('Booking creation error:', err);
      setError(err instanceof Error ? err.message : 'Une erreur est survenue');
    } finally {
      setIsSubmitting(false);
    }
  };

  const canProceedToStep2 = formData.carrierName && formData.origin && formData.destination;
  const canProceedToStep3 = formData.documents.length >= 1;
  const canSubmit = canProceedToStep3;

  const formatPrice = (price: number, currency: string) => {
    return new Intl.NumberFormat('fr-FR', {
      style: 'currency',
      currency: currency,
    }).format(price);
  };

  return (
    <div className="min-h-screen bg-gradient-to-br from-blue-50 to-indigo-100 py-12 px-4">
      <div className="max-w-4xl mx-auto">
        {/* Header */}
        <div className="mb-8">
          <button
            onClick={() => router.back()}
            className="mb-4 flex items-center text-blue-600 hover:text-blue-800 font-medium"
          >
            ← Retour aux résultats
          </button>

          <div className="bg-white rounded-lg shadow-md p-6">
            <h1 className="text-3xl font-bold text-gray-900 mb-2">Nouvelle demande de réservation</h1>
            <p className="text-gray-600">
              Envoyez une demande de réservation directement au transporteur
            </p>
          </div>
        </div>

        {/* Progress Steps */}
        <div className="mb-8">
          <div className="flex items-center justify-between">
            {[1, 2, 3].map(step => (
              <div key={step} className="flex items-center flex-1">
                <div className="flex items-center">
                  <div
                    className={`w-10 h-10 rounded-full flex items-center justify-center font-semibold ${
                      currentStep >= step
                        ? 'bg-blue-600 text-white'
                        : 'bg-gray-200 text-gray-600'
                    }`}
                  >
                    {step}
                  </div>
                  <div className="ml-3">
                    <p
                      className={`text-sm font-medium ${
                        currentStep >= step ? 'text-blue-600' : 'text-gray-500'
                      }`}
                    >
                      {step === 1 && 'Détails'}
                      {step === 2 && 'Documents'}
                      {step === 3 && 'Révision'}
                    </p>
                  </div>
                </div>
                {step < 3 && (
                  <div
                    className={`flex-1 h-1 mx-4 ${
                      currentStep > step ? 'bg-blue-600' : 'bg-gray-200'
                    }`}
                  />
                )}
              </div>
            ))}
          </div>
        </div>

        {/* Error Message */}
        {error && (
          <div className="mb-6 bg-red-50 border-2 border-red-200 rounded-lg p-4">
            <div className="flex items-start">
              <span className="text-2xl mr-3">⚠️</span>
              <div>
                <h4 className="font-semibold text-red-900 mb-1">Erreur</h4>
                <p className="text-red-700 whitespace-pre-line">{error}</p>
              </div>
            </div>
          </div>
        )}

        {/* Step Content */}
        <div className="bg-white rounded-lg shadow-lg p-8">
          {/* Step 1: Transport Details (Read-only) */}
          {currentStep === 1 && (
            <div>
              <h2 className="text-2xl font-bold text-gray-900 mb-6">
                Détails du transport
              </h2>

              <div className="space-y-6">
                {/* Carrier Info */}
                <div className="bg-blue-50 border-2 border-blue-200 rounded-lg p-6">
                  <h3 className="text-lg font-semibold text-gray-900 mb-4">
                    Transporteur
                  </h3>
                  <div className="grid grid-cols-2 gap-4">
                    <div>
                      <p className="text-sm text-gray-600">Nom</p>
                      <p className="font-semibold text-gray-900">{formData.carrierName}</p>
                    </div>
                    <div>
                      <p className="text-sm text-gray-600">Email</p>
                      <p className="font-semibold text-gray-900">{formData.carrierEmail}</p>
                    </div>
                  </div>
                </div>

                {/* Route Info */}
                <div className="bg-gray-50 rounded-lg p-6">
                  <h3 className="text-lg font-semibold text-gray-900 mb-4">
                    Trajet
                  </h3>
                  <div className="flex items-center justify-between">
                    <div className="text-center">
                      <p className="text-sm text-gray-600 mb-1">Origine</p>
                      <p className="text-xl font-bold text-blue-600">{formData.origin}</p>
                    </div>
                    <div className="flex-1 mx-8">
                      <div className="border-t-2 border-dashed border-gray-300 relative">
                        <div className="absolute top-1/2 left-1/2 transform -translate-x-1/2 -translate-y-1/2 bg-white px-3">
                          <span className="text-sm text-gray-600">{formData.transitDays} jours</span>
                        </div>
                      </div>
                    </div>
                    <div className="text-center">
                      <p className="text-sm text-gray-600 mb-1">Destination</p>
                      <p className="text-xl font-bold text-blue-600">{formData.destination}</p>
                    </div>
                  </div>
                </div>

                {/* Shipment Details */}
                <div className="grid grid-cols-2 md:grid-cols-4 gap-4">
                  <div className="bg-gray-50 rounded-lg p-4">
                    <p className="text-xs text-gray-600 mb-1">Volume</p>
                    <p className="text-lg font-bold text-gray-900">{formData.volumeCBM} CBM</p>
                  </div>
                  <div className="bg-gray-50 rounded-lg p-4">
                    <p className="text-xs text-gray-600 mb-1">Poids</p>
                    <p className="text-lg font-bold text-gray-900">{formData.weightKG} kg</p>
                  </div>
                  <div className="bg-gray-50 rounded-lg p-4">
                    <p className="text-xs text-gray-600 mb-1">Palettes</p>
                    <p className="text-lg font-bold text-gray-900">{formData.palletCount || 'N/A'}</p>
                  </div>
                  <div className="bg-gray-50 rounded-lg p-4">
                    <p className="text-xs text-gray-600 mb-1">Type</p>
                    <p className="text-lg font-bold text-gray-900">{formData.containerType}</p>
                  </div>
                </div>

                {/* Pricing */}
                <div className="bg-green-50 border-2 border-green-200 rounded-lg p-6">
                  <h3 className="text-lg font-semibold text-gray-900 mb-4">
                    Prix estimé
                  </h3>
                  <div className="flex items-center justify-between">
                    <div>
                      <p className="text-sm text-gray-600">Prix en EUR</p>
                      <p className="text-3xl font-bold text-green-600">
                        {formatPrice(formData.priceEUR, 'EUR')}
                      </p>
                    </div>
                    {formData.priceUSD > 0 && (
                      <div className="text-right">
                        <p className="text-sm text-gray-600">Prix en USD</p>
                        <p className="text-xl font-semibold text-gray-700">
                          {formatPrice(formData.priceUSD, 'USD')}
                        </p>
                      </div>
                    )}
                  </div>
                </div>
              </div>

              <div className="mt-8 flex justify-end">
                <button
                  onClick={() => setCurrentStep(2)}
                  disabled={!canProceedToStep2}
                  className="px-8 py-3 bg-blue-600 text-white rounded-lg hover:bg-blue-700 disabled:bg-gray-400 disabled:cursor-not-allowed font-semibold"
                >
                  Continuer →
                </button>
              </div>
            </div>
          )}

          {/* Step 2: Document Upload */}
          {currentStep === 2 && (
            <div>
              <h2 className="text-2xl font-bold text-gray-900 mb-6">
                Documents requis
              </h2>

              <div className="mb-6 bg-yellow-50 border-2 border-yellow-200 rounded-lg p-4">
                <div className="flex items-start">
                  <span className="text-2xl mr-3">📋</span>
                  <div>
                    <h4 className="font-semibold text-yellow-900 mb-1">Information importante</h4>
                    <p className="text-sm text-yellow-800">
                      Veuillez télécharger au moins <strong>1 document</strong> pour continuer.
                      Formats acceptés: PDF, DOC, DOCX, JPG, PNG (max 5MB par fichier)
                    </p>
                  </div>
                </div>
              </div>

              {/* File Upload */}
              <div className="space-y-4 mb-8">
                <div className="border-2 border-dashed border-gray-300 rounded-lg p-8 text-center hover:border-blue-400 transition-colors">
                  <input
                    type="file"
                    id="file-upload"
                    multiple
                    accept={ACCEPTED_FILE_TYPES.join(',')}
                    onChange={(e) => handleFileChange(e.target.files)}
                    className="hidden"
                  />
                  <label
                    htmlFor="file-upload"
                    className="cursor-pointer flex flex-col items-center"
                  >
                    <svg
                      className="w-16 h-16 text-gray-400 mb-4"
                      fill="none"
                      stroke="currentColor"
                      viewBox="0 0 24 24"
                    >
                      <path
                        strokeLinecap="round"
                        strokeLinejoin="round"
                        strokeWidth={2}
                        d="M7 16a4 4 0 01-.88-7.903A5 5 0 1115.9 6L16 6a5 5 0 011 9.9M15 13l-3-3m0 0l-3 3m3-3v12"
                      />
                    </svg>
                    <p className="text-lg font-semibold text-gray-700 mb-2">
                      Cliquez pour sélectionner des fichiers
                    </p>
                    <p className="text-sm text-gray-500">
                      ou glissez-déposez vos documents ici
                    </p>
                  </label>
                </div>

                {/* Document Type Suggestions */}
                <div className="bg-gray-50 rounded-lg p-4">
                  <p className="text-sm font-semibold text-gray-700 mb-2">
                    Documents recommandés :
                  </p>
                  <ul className="text-sm text-gray-600 space-y-1">
                    {DOCUMENT_TYPES.map(type => (
                      <li key={type.value}>• {type.label}</li>
                    ))}
                  </ul>
                </div>
              </div>

              {/* Uploaded Files List */}
              {formData.documents.length > 0 && (
                <div className="mb-8">
                  <h3 className="text-lg font-semibold text-gray-900 mb-4">
                    Documents sélectionnés ({formData.documents.length})
                  </h3>
                  <div className="space-y-2">
                    {formData.documents.map((file, index) => (
                      <div
                        key={index}
                        className="flex items-center justify-between bg-gray-50 rounded-lg p-4 border border-gray-200"
                      >
                        <div className="flex items-center space-x-3">
                          <svg
                            className="w-6 h-6 text-blue-600"
                            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>
                          <div>
                            <p className="font-medium text-gray-900">{file.name}</p>
                            <p className="text-xs text-gray-500">
                              {(file.size / 1024 / 1024).toFixed(2)} MB
                            </p>
                          </div>
                        </div>
                        <button
                          onClick={() => removeDocument(index)}
                          className="text-red-600 hover:text-red-800 font-medium text-sm"
                        >
                          Supprimer
                        </button>
                      </div>
                    ))}
                  </div>
                </div>
              )}

              {/* Optional Notes */}
              <div className="mb-8">
                <label className="block text-sm font-medium text-gray-700 mb-2">
                  Notes ou instructions spéciales (optionnel)
                </label>
                <textarea
                  value={formData.notes || ''}
                  onChange={(e) => setFormData(prev => ({ ...prev, notes: e.target.value }))}
                  rows={4}
                  className="w-full px-4 py-2 border border-gray-300 rounded-lg focus:ring-2 focus:ring-blue-500 focus:border-blue-500"
                  placeholder="Ajoutez des instructions spéciales pour le transporteur..."
                />
              </div>

              <div className="flex justify-between">
                <button
                  onClick={() => setCurrentStep(1)}
                  className="px-8 py-3 bg-gray-200 text-gray-700 rounded-lg hover:bg-gray-300 font-semibold"
                >
                  ← Retour
                </button>
                <button
                  onClick={() => setCurrentStep(3)}
                  disabled={!canProceedToStep3}
                  className="px-8 py-3 bg-blue-600 text-white rounded-lg hover:bg-blue-700 disabled:bg-gray-400 disabled:cursor-not-allowed font-semibold"
                >
                  Continuer →
                </button>
              </div>
            </div>
          )}

          {/* Step 3: Review & Submit */}
          {currentStep === 3 && (
            <div>
              <h2 className="text-2xl font-bold text-gray-900 mb-6">
                Révision et envoi
              </h2>

              <div className="space-y-6 mb-8">
                {/* Summary */}
                <div className="bg-blue-50 border-2 border-blue-200 rounded-lg p-6">
                  <h3 className="text-lg font-semibold text-gray-900 mb-4">
                    Récapitulatif
                  </h3>
                  <div className="space-y-3">
                    <div className="flex justify-between">
                      <span className="text-gray-600">Transporteur :</span>
                      <span className="font-semibold text-gray-900">{formData.carrierName}</span>
                    </div>
                    <div className="flex justify-between">
                      <span className="text-gray-600">Trajet :</span>
                      <span className="font-semibold text-gray-900">
                        {formData.origin} → {formData.destination}
                      </span>
                    </div>
                    <div className="flex justify-between">
                      <span className="text-gray-600">Volume :</span>
                      <span className="font-semibold text-gray-900">{formData.volumeCBM} CBM</span>
                    </div>
                    <div className="flex justify-between">
                      <span className="text-gray-600">Poids :</span>
                      <span className="font-semibold text-gray-900">{formData.weightKG} kg</span>
                    </div>
                    <div className="flex justify-between">
                      <span className="text-gray-600">Documents :</span>
                      <span className="font-semibold text-gray-900">
                        {formData.documents.length} fichier(s)
                      </span>
                    </div>
                    <div className="flex justify-between border-t pt-3 mt-3">
                      <span className="text-gray-900 font-semibold">Prix total :</span>
                      <span className="text-2xl font-bold text-green-600">
                        {formatPrice(formData.priceEUR, 'EUR')}
                      </span>
                    </div>
                  </div>
                </div>

                {/* What happens next */}
                <div className="bg-yellow-50 border-2 border-yellow-200 rounded-lg p-6">
                  <h3 className="text-lg font-semibold text-gray-900 mb-3">
                    📧 Que se passe-t-il ensuite ?
                  </h3>
                  <ul className="space-y-2 text-sm text-gray-700">
                    <li className="flex items-start">
                      <span className="mr-2">1.</span>
                      <span>
                        Votre demande sera <strong>envoyée par email</strong> au transporteur ({formData.carrierEmail})
                      </span>
                    </li>
                    <li className="flex items-start">
                      <span className="mr-2">2.</span>
                      <span>
                        Le transporteur recevra tous vos documents et détails de transport
                      </span>
                    </li>
                    <li className="flex items-start">
                      <span className="mr-2">3.</span>
                      <span>
                        Il pourra <strong>accepter ou refuser</strong> la demande directement depuis son email
                      </span>
                    </li>
                    <li className="flex items-start">
                      <span className="mr-2">4.</span>
                      <span>
                        Vous recevrez une <strong>notification</strong> dès que le transporteur répond (sous 7 jours maximum)
                      </span>
                    </li>
                  </ul>
                </div>

                {/* Terms */}
                <div className="bg-gray-50 rounded-lg p-4">
                  <label className="flex items-start cursor-pointer">
                    <input
                      type="checkbox"
                      className="mt-1 h-4 w-4 text-blue-600 focus:ring-blue-500 border-gray-300 rounded"
                      required
                    />
                    <span className="ml-3 text-sm text-gray-700">
                      Je confirme que les informations fournies sont exactes et que j'accepte les{' '}
                      <a href="#" className="text-blue-600 hover:underline">
                        conditions générales
                      </a>
                    </span>
                  </label>
                </div>
              </div>

              <div className="flex justify-between">
                <button
                  onClick={() => setCurrentStep(2)}
                  disabled={isSubmitting}
                  className="px-8 py-3 bg-gray-200 text-gray-700 rounded-lg hover:bg-gray-300 font-semibold disabled:opacity-50"
                >
                  ← Retour
                </button>
                <button
                  onClick={handleSubmit}
                  disabled={!canSubmit || isSubmitting}
                  className="px-8 py-3 bg-green-600 text-white rounded-lg hover:bg-green-700 disabled:bg-gray-400 disabled:cursor-not-allowed font-semibold"
                >
                  {isSubmitting ? (
                    <span className="flex items-center">
                      <div className="animate-spin rounded-full h-5 w-5 border-b-2 border-white mr-2"></div>
                      Envoi en cours...
                    </span>
                  ) : (
                    '✓ Envoyer la demande'
                  )}
                </button>
              </div>
            </div>
          )}
        </div>
      </div>
    </div>
  );
}

export default function NewBookingPage() {
  return (
    <Suspense fallback={<div className="min-h-screen flex items-center justify-center">Chargement...</div>}>
      <NewBookingPageContent />
    </Suspense>
  );
}