import React, { useState } from 'react'
import { useParams, useNavigate, Link } from 'react-router-dom'
import { useQuery, useMutation, useQueryClient } from '@tanstack/react-query'
import {
  FaArrowLeft,
  FaSave,
  FaTimes,
  FaBuilding,
  FaUser,
  FaMapMarkerAlt,
  FaIdCard,
  FaCreditCard,
  FaExclamationTriangle,
} from 'react-icons/fa'
import classNames from 'classnames'
import { CustomerSegmentEnum, CustomerTypeEnum } from '../../../types/crm'
import { mockBusinessParties, mockBusinessPartyNew } from '../../../mocks/mockBusinessParties'
import { BusinessParty, BusinessPartyStatusEnum, PaymentTerms } from '../../../types/common'
import { Container } from '@/components/shared'
import { ROUTES_ENUM } from '@/routes/route.constant'
import {
  getBusinessPartyStatusText,
  getCustomerSegmentText,
  getCustomerTypeText,
  getPaymentTermsText,
} from '@/utils/erp'
import { mockCurrencies } from '@/mocks/mockCurrencies'

const CustomerEdit: React.FC = () => {
  const { id } = useParams<{ id: string }>()
  const navigate = useNavigate()
  const queryClient = useQueryClient()
  const [activeTab, setActiveTab] = useState('basic')
  const [isDirty, setIsDirty] = useState(false)

  const {
    data: customer,
    isLoading,
    error,
  } = useQuery({
    queryKey: ['customer', id],
    queryFn: async () => {
      await new Promise((resolve) => setTimeout(resolve, 300))
      const found = mockBusinessParties.find((c) => c.id === id)
      if (!found) throw new Error('Müşteri bulunamadı')
      return found
    },
  })

  const [formData, setFormData] = useState<BusinessParty>(mockBusinessPartyNew)

  // Initialize form data when customer is loaded
  React.useEffect(() => {
    if (customer) {
      setFormData(mockBusinessParties.find((c) => c.id === id) || mockBusinessPartyNew)
    }
  }, [customer, id])

  const updateMutation = useMutation({
    mutationFn: async (data: BusinessParty) => {
      await new Promise((resolve) => setTimeout(resolve, 1000))
      // Simulate API call
      return { ...customer, ...data }
    },
    onSuccess: () => {
      queryClient.invalidateQueries({ queryKey: ['customers'] })
      queryClient.invalidateQueries({ queryKey: ['customer', id] })
      setIsDirty(false)
      navigate(ROUTES_ENUM.protected.crm.customersDetail.replace(':id', id || 'new'))
    },
  })

  const handleInputChange = (field: string, value: string | number) => {
    const keys = field.split('.')
    if (keys.length === 2) {
      const [section, subField] = keys
      setFormData((prev: any) => {
        if (section === 'primaryContact') {
          return {
            ...prev,
            primaryContact: {
              ...prev.primaryContact,
              [subField]: value,
            },
          }
        } else if (section === 'address') {
          return {
            ...prev,
            address: {
              ...prev.address,
              [subField]: value,
            },
          }
        }
        return prev
      })
    } else {
      setFormData((prev) => ({
        ...prev,
        [field]: value,
      }))
    }
    setIsDirty(true)
  }

  const handleSubmit = (e: React.FormEvent) => {
    e.preventDefault()

    updateMutation.mutate(formData)
  }

  const handleCancel = () => {
    if (isDirty) {
      if (window.confirm('Değişiklikleriniz kaydedilmedi. Çıkmak istediğinizden emin misiniz?')) {
        navigate(ROUTES_ENUM.protected.crm.customersDetail.replace(':id', id!))
      }
    } else {
      navigate(ROUTES_ENUM.protected.crm.customersDetail.replace(':id', id!))
    }
  }

  if (isLoading) {
    return (
      <div className="min-h-screen bg-gray-50 p-6">
        <div className="mx-auto">
          <div className="animate-pulse">
            <div className="h-8 bg-gray-200 rounded w-1/4 mb-6"></div>
            <div className="bg-white rounded-lg shadow p-6">
              <div className="space-y-4">
                {[...Array(8)].map((_, i) => (
                  <div key={i} className="h-10 bg-gray-200 rounded"></div>
                ))}
              </div>
            </div>
          </div>
        </div>
      </div>
    )
  }

  if (error || !customer) {
    return (
      <div className="min-h-screen bg-gray-50 p-6">
        <div className="mx-auto">
          <div className="bg-red-50 border border-red-200 rounded-lg p-6">
            <div className="flex items-center">
              <FaExclamationTriangle className="h-8 w-8 text-red-600 mr-3" />
              <div>
                <h3 className="text-lg font-medium text-red-800">Müşteri Bulunamadı</h3>
                <p className="text-red-600">Düzenlemek istediğiniz müşteri mevcut değil.</p>
              </div>
            </div>
            <div className="mt-4">
              <button
                onClick={() => navigate(ROUTES_ENUM.protected.crm.customers)}
                className="inline-flex items-center px-4 py-2 bg-red-600 text-white rounded-lg hover:bg-red-700 transition-colors"
              >
                <FaArrowLeft className="w-4 h-4 mr-2" />
                Müşteri Listesine Dön
              </button>
            </div>
          </div>
        </div>
      </div>
    )
  }

  const tabs = [
    { id: 'basic', label: 'Temel Bilgiler', icon: FaBuilding },
    { id: 'contact', label: 'İletişim', icon: FaUser },
    { id: 'business', label: 'İş Bilgileri', icon: FaIdCard },
    { id: 'financial', label: 'Finansal', icon: FaCreditCard },
  ]

  return (
    <Container>
      <div className="space-y-2">
        <form onSubmit={handleSubmit}>
          {/* Header */}
          <div className="bg-white border-b border-gray-200">
            <div className="mx-auto px-4 py-3">
              {/* Breadcrumb */}
              <div className="flex items-center space-x-2 text-xs text-gray-500 mb-3">
                <Link to={ROUTES_ENUM.protected.crm.customers} className="hover:text-blue-600">
                  Müşteriler
                </Link>
                <span>/</span>
                <Link
                  to={ROUTES_ENUM.protected.crm.customersDetail.replace(':id', id || 'new')}
                  className="hover:text-blue-600"
                >
                  {customer.name}
                </Link>
                <span>/</span>
                <span className="text-gray-900">Düzenle</span>
              </div>

              {/* Header */}
              <div className="flex items-center justify-between">
                <div className="flex items-center space-x-4">
                  <button
                    type="button"
                    onClick={handleCancel}
                    className="p-1.5 text-gray-600 hover:text-gray-900 hover:bg-gray-100 rounded-lg transition-colors"
                  >
                    <FaArrowLeft className="w-5 h-5" />
                  </button>

                  <div className="flex items-center space-x-4">
                    <div className="w-12 h-12 bg-gradient-to-br from-blue-500 to-blue-600 rounded-lg flex items-center justify-center text-white shadow-lg">
                      <FaBuilding className="w-8 h-8" />
                    </div>

                    <div>
                      <h2 className="text-2xl font-bold text-gray-900">Müşteri Düzenle</h2>
                      <p className="text-sm text-gray-600">{customer.name}</p>
                    </div>
                  </div>
                </div>

                <div className="flex items-center space-x-2">
                  <button
                    type="button"
                    onClick={handleCancel}
                    className="inline-flex items-center px-3 py-1.5 text-sm border border-gray-300 bg-white text-gray-700 rounded-lg hover:bg-gray-50 transition-colors"
                  >
                    <FaTimes className="w-4 h-4 mr-2" />
                    İptal
                  </button>
                  <button
                    type="submit"
                    disabled={!isDirty || updateMutation.isPending}
                    className={classNames(
                      'inline-flex items-center px-3 py-1.5 text-sm rounded-lg transition-colors',
                      isDirty && !updateMutation.isPending
                        ? 'bg-blue-600 text-white hover:bg-blue-700'
                        : 'bg-gray-300 text-gray-500 cursor-not-allowed',
                    )}
                  >
                    {updateMutation.isPending ? (
                      <>
                        <div className="animate-spin w-4 h-4 mr-2 border-2 border-white border-t-transparent rounded-full"></div>
                        Kaydediliyor...
                      </>
                    ) : (
                      <>
                        <FaSave className="w-4 h-4 mr-2" />
                        Kaydet
                      </>
                    )}
                  </button>
                </div>
              </div>
            </div>
          </div>

          {/* Tabs */}
          <div className="bg-white border-b border-gray-200">
            <div className="mx-auto px-4">
              <nav className="flex space-x-8">
                {tabs.map((tab) => (
                  <button
                    key={tab.id}
                    type="button"
                    onClick={() => setActiveTab(tab.id)}
                    className={classNames(
                      'flex items-center space-x-2 py-3 px-1 border-b-2 font-medium text-sm transition-colors',
                      activeTab === tab.id
                        ? 'border-blue-500 text-blue-600'
                        : 'border-transparent text-gray-500 hover:text-gray-700 hover:border-gray-300',
                    )}
                  >
                    <tab.icon className="w-4 h-4" />
                    <span>{tab.label}</span>
                  </button>
                ))}
              </nav>
            </div>
          </div>

          {/* Form Content */}
          <div className="mx-auto py-4">
            {activeTab === 'basic' && (
              <div className="bg-white rounded-lg shadow p-4">
                <h3 className="text-base font-semibold text-gray-900 mb-4 flex items-center">
                  <FaBuilding className="w-5 h-5 mr-2" />
                  Temel Bilgiler
                </h3>

                <div className="grid grid-cols-1 md:grid-cols-2 gap-4">
                  <div>
                    <label className="block text-xs font-medium text-gray-700 mb-1">
                      Müşteri Kodu *
                    </label>
                    <input
                      type="text"
                      value={formData.code}
                      onChange={(e) => handleInputChange('code', e.target.value)}
                      className="w-full px-3 py-1.5 text-sm border border-gray-300 rounded-lg focus:ring-2 focus:ring-blue-500 focus:border-transparent"
                      required
                    />
                  </div>

                  <div>
                    <label className="block text-xs font-medium text-gray-700 mb-1">
                      Şirket Adı *
                    </label>
                    <input
                      type="text"
                      value={formData.name}
                      onChange={(e) => handleInputChange('name', e.target.value)}
                      className="w-full px-3 py-1.5 text-sm border border-gray-300 rounded-lg focus:ring-2 focus:ring-blue-500 focus:border-transparent"
                      required
                    />
                  </div>

                  <div>
                    <label className="block text-xs font-medium text-gray-700 mb-1">
                      Müşteri Tipi
                    </label>
                    <select
                      value={formData.customerType}
                      onChange={(e) => handleInputChange('customerType', e.target.value)}
                      className="w-full px-3 py-1.5 text-sm border border-gray-300 rounded-lg focus:ring-2 focus:ring-blue-500 focus:border-transparent"
                    >
                      {Object.values(CustomerTypeEnum).map((type) => (
                        <option key={type} value={type}>
                          {getCustomerTypeText(type)}
                        </option>
                      ))}
                    </select>
                  </div>

                  <div>
                    <label className="block text-xs font-medium text-gray-700 mb-1">Sektör</label>
                    <input
                      type="text"
                      value={formData.industry}
                      onChange={(e) => handleInputChange('industry', e.target.value)}
                      className="w-full px-3 py-1.5 text-sm border border-gray-300 rounded-lg focus:ring-2 focus:ring-blue-500 focus:border-transparent"
                      placeholder="Teknoloji, İmalat, Hizmet vb."
                    />
                  </div>

                  <div className="md:col-span-2">
                    <label className="block text-xs font-medium text-gray-700 mb-1">Website</label>
                    <input
                      type="url"
                      value={formData.website}
                      onChange={(e) => handleInputChange('website', e.target.value)}
                      className="w-full px-3 py-1.5 text-sm border border-gray-300 rounded-lg focus:ring-2 focus:ring-blue-500 focus:border-transparent"
                      placeholder="https://www.ornek.com"
                    />
                  </div>

                  <div>
                    <label className="block text-xs font-medium text-gray-700 mb-1">
                      Müşteri Durumu
                    </label>
                    <select
                      value={formData.status}
                      onChange={(e) => handleInputChange('status', e.target.value)}
                      className="w-full px-3 py-1.5 text-sm border border-gray-300 rounded-lg focus:ring-2 focus:ring-blue-500 focus:border-transparent"
                    >
                      {Object.values(BusinessPartyStatusEnum).map((status) => (
                        <option key={status} value={status}>
                          {getBusinessPartyStatusText(status)}
                        </option>
                      ))}
                    </select>
                  </div>

                  <div>
                    <label className="block text-xs font-medium text-gray-700 mb-1">
                      Müşteri Segmenti
                    </label>
                    <select
                      value={formData.customerSegment}
                      onChange={(e) => handleInputChange('customerSegment', e.target.value)}
                      className="w-full px-3 py-1.5 text-sm border border-gray-300 rounded-lg focus:ring-2 focus:ring-blue-500 focus:border-transparent"
                    >
                      {Object.values(CustomerSegmentEnum).map((segment) => (
                        <option key={segment} value={segment}>
                          {getCustomerSegmentText(segment)}
                        </option>
                      ))}
                    </select>
                  </div>
                </div>
              </div>
            )}

            {activeTab === 'contact' && (
              <div className="space-y-4">
                {/* Primary Contact */}
                <div className="bg-white rounded-lg shadow p-4">
                  <h3 className="text-base font-semibold text-gray-900 mb-4 flex items-center">
                    <FaUser className="w-5 h-5 mr-2" />
                    Ana İletişim Kişisi
                  </h3>

                  <div className="grid grid-cols-1 md:grid-cols-2 gap-4">
                    <div>
                      <label className="block text-xs font-medium text-gray-700 mb-1">Ad *</label>
                      <input
                        type="text"
                        value={formData.primaryContact?.firstName}
                        onChange={(e) =>
                          handleInputChange('primaryContact.firstName', e.target.value)
                        }
                        className="w-full px-3 py-1.5 text-sm border border-gray-300 rounded-lg focus:ring-2 focus:ring-blue-500 focus:border-transparent"
                        required
                      />
                    </div>

                    <div>
                      <label className="block text-xs font-medium text-gray-700 mb-1">
                        Soyad *
                      </label>
                      <input
                        type="text"
                        value={formData.primaryContact?.lastName}
                        onChange={(e) =>
                          handleInputChange('primaryContact.lastName', e.target.value)
                        }
                        className="w-full px-3 py-1.5 text-sm border border-gray-300 rounded-lg focus:ring-2 focus:ring-blue-500 focus:border-transparent"
                        required
                      />
                    </div>

                    <div>
                      <label className="block text-xs font-medium text-gray-700 mb-1">Ünvan</label>
                      <input
                        type="text"
                        value={formData.primaryContact?.title}
                        onChange={(e) => handleInputChange('primaryContact.title', e.target.value)}
                        className="w-full px-3 py-1.5 text-sm border border-gray-300 rounded-lg focus:ring-2 focus:ring-blue-500 focus:border-transparent"
                        placeholder="Genel Müdür, Satış Direktörü vb."
                      />
                    </div>

                    <div>
                      <label className="block text-xs font-medium text-gray-700 mb-1">
                        Departman
                      </label>
                      <input
                        type="text"
                        value={formData.primaryContact?.department}
                        onChange={(e) =>
                          handleInputChange('primaryContact.department', e.target.value)
                        }
                        className="w-full px-3 py-1.5 text-sm border border-gray-300 rounded-lg focus:ring-2 focus:ring-blue-500 focus:border-transparent"
                        placeholder="Satış, Pazarlama, İnsan Kaynakları vb."
                      />
                    </div>

                    <div>
                      <label className="block text-xs font-medium text-gray-700 mb-1">
                        E-posta *
                      </label>
                      <input
                        type="email"
                        value={formData.primaryContact?.email}
                        onChange={(e) => handleInputChange('primaryContact.email', e.target.value)}
                        className="w-full px-3 py-1.5 text-sm border border-gray-300 rounded-lg focus:ring-2 focus:ring-blue-500 focus:border-transparent"
                        required
                      />
                    </div>

                    <div>
                      <label className="block text-xs font-medium text-gray-700 mb-1">
                        Telefon
                      </label>
                      <input
                        type="tel"
                        value={formData.primaryContact?.phoneNumber}
                        onChange={(e) => handleInputChange('primaryContact.phoneNumber', e.target.value)}
                        className="w-full px-3 py-1.5 text-sm border border-gray-300 rounded-lg focus:ring-2 focus:ring-blue-500 focus:border-transparent"
                        placeholder="+90 (212) 555 0123"
                      />
                    </div>

                    <div className="md:col-span-2">
                      <label className="block text-xs font-medium text-gray-700 mb-1">
                        Mobil Telefon
                      </label>
                      <input
                        type="tel"
                        value={formData.primaryContact?.mobileNumber}
                        onChange={(e) => handleInputChange('primaryContact.mobile', e.target.value)}
                        className="w-full px-3 py-1.5 text-sm border border-gray-300 rounded-lg focus:ring-2 focus:ring-blue-500 focus:border-transparent"
                        placeholder="+90 (555) 123 4567"
                      />
                    </div>
                  </div>
                </div>

                {/* Address */}
                <div className="bg-white rounded-lg shadow p-4">
                  <h3 className="text-base font-semibold text-gray-900 mb-4 flex items-center">
                    <FaMapMarkerAlt className="w-5 h-5 mr-2" />
                    Adres Bilgileri
                  </h3>

                  <div className="grid grid-cols-1 gap-4">
                    <div>
                      <label className="block text-xs font-medium text-gray-700 mb-1">
                        Adres *
                      </label>
                      <textarea
                        value={formData.address?.street}
                        onChange={(e) => handleInputChange('address.street', e.target.value)}
                        rows={3}
                        className="w-full px-3 py-1.5 text-sm border border-gray-300 rounded-lg focus:ring-2 focus:ring-blue-500 focus:border-transparent"
                        placeholder="Sokak, cadde, mahalle, bina no vb."
                        required
                      />
                    </div>

                    <div className="grid grid-cols-1 md:grid-cols-2 lg:grid-cols-4 gap-4">
                      <div>
                        <label className="block text-xs font-medium text-gray-700 mb-1">
                          Şehir *
                        </label>
                        <input
                          type="text"
                          value={formData.address?.city}
                          onChange={(e) => handleInputChange('address.city', e.target.value)}
                          className="w-full px-3 py-1.5 text-sm border border-gray-300 rounded-lg focus:ring-2 focus:ring-blue-500 focus:border-transparent"
                          required
                        />
                      </div>

                      <div>
                        <label className="block text-xs font-medium text-gray-700 mb-1">
                          İl/Eyalet
                        </label>
                        <input
                          type="text"
                          value={formData.address?.state}
                          onChange={(e) => handleInputChange('address.state', e.target.value)}
                          className="w-full px-3 py-1.5 text-sm border border-gray-300 rounded-lg focus:ring-2 focus:ring-blue-500 focus:border-transparent"
                        />
                      </div>

                      <div>
                        <label className="block text-xs font-medium text-gray-700 mb-1">
                          Posta Kodu
                        </label>
                        <input
                          type="text"
                          value={formData.address?.postalCode}
                          onChange={(e) => handleInputChange('address.postalCode', e.target.value)}
                          className="w-full px-3 py-1.5 text-sm border border-gray-300 rounded-lg focus:ring-2 focus:ring-blue-500 focus:border-transparent"
                        />
                      </div>

                      <div>
                        <label className="block text-xs font-medium text-gray-700 mb-1">
                          Ülke *
                        </label>
                        <input
                          type="text"
                          value={formData.address?.country}
                          onChange={(e) => handleInputChange('address.country', e.target.value)}
                          className="w-full px-3 py-1.5 text-sm border border-gray-300 rounded-lg focus:ring-2 focus:ring-blue-500 focus:border-transparent"
                          required
                        />
                      </div>
                    </div>
                  </div>
                </div>
              </div>
            )}

            {activeTab === 'business' && (
              <div className="bg-white rounded-lg shadow p-4">
                <h3 className="text-base font-semibold text-gray-900 mb-4 flex items-center">
                  <FaIdCard className="w-5 h-5 mr-2" />
                  İş Bilgileri
                </h3>

                <div className="grid grid-cols-1 md:grid-cols-2 gap-4">
                  <div>
                    <label className="block text-xs font-medium text-gray-700 mb-1">
                      Vergi Numarası
                    </label>
                    <input
                      type="text"
                      value={formData.taxNumber}
                      onChange={(e) => handleInputChange('taxNumber', e.target.value)}
                      className="w-full px-3 py-1.5 text-sm border border-gray-300 rounded-lg focus:ring-2 focus:ring-blue-500 focus:border-transparent"
                      placeholder="1234567890"
                    />
                  </div>

                  <div>
                    <label className="block text-xs font-medium text-gray-700 mb-1">
                      Sicil Numarası
                    </label>
                    <input
                      type="text"
                      value={formData.registrationNumber}
                      onChange={(e) => handleInputChange('registrationNumber', e.target.value)}
                      className="w-full px-3 py-1.5 text-sm border border-gray-300 rounded-lg focus:ring-2 focus:ring-blue-500 focus:border-transparent"
                      placeholder="123456789"
                    />
                  </div>

                  <div className="md:col-span-2">
                    <label className="block text-xs font-medium text-gray-700 mb-1">
                      Atanmış Satış Temsilcisi
                    </label>
                    <input
                      type="text"
                      value={formData.assignedSalesRep}
                      onChange={(e) => handleInputChange('assignedSalesRep', e.target.value)}
                      className="w-full px-3 py-1.5 text-sm border border-gray-300 rounded-lg focus:ring-2 focus:ring-blue-500 focus:border-transparent"
                      placeholder="Satış temsilcisi adı"
                    />
                  </div>
                </div>
              </div>
            )}

            {activeTab === 'financial' && (
              <div className="bg-white rounded-lg shadow p-4">
                <h3 className="text-base font-semibold text-gray-900 mb-4 flex items-center">
                  <FaCreditCard className="w-5 h-5 mr-2" />
                  Finansal Bilgiler
                </h3>

                <div className="grid grid-cols-1 md:grid-cols-2 gap-4">
                  <div>
                    <label className="block text-xs font-medium text-gray-700 mb-1">
                      Kredi Limiti (₺)
                    </label>
                    <input
                      type="number"
                      value={formData.creditLimit}
                      onChange={(e) => handleInputChange('creditLimit', Number(e.target.value))}
                      className="w-full px-3 py-1.5 text-sm border border-gray-300 rounded-lg focus:ring-2 focus:ring-blue-500 focus:border-transparent"
                      min="0"
                      step="1000"
                    />
                  </div>

                  <div>
                    <label className="block text-xs font-medium text-gray-700 mb-1">
                      Para Birimi
                    </label>
                    <select
                      value={formData.currency}
                      onChange={(e) => handleInputChange('currency', e.target.value)}
                      className="w-full px-3 py-1.5 text-sm border border-gray-300 rounded-lg focus:ring-2 focus:ring-blue-500 focus:border-transparent"
                    >
                      {mockCurrencies.map((currency) => (
                        <option key={currency.value} value={currency.value}>
                          {currency.value} - {currency.label}
                        </option>
                      ))}
                    </select>
                  </div>

                  <div className="md:col-span-2">
                    <label className="block text-xs font-medium text-gray-700 mb-1">
                      Ödeme Koşulları
                    </label>
                    <select
                      value={formData.paymentTerms}
                      onChange={(e) => handleInputChange('paymentTerms', e.target.value)}
                      className="w-full px-3 py-1.5 text-sm border border-gray-300 rounded-lg focus:ring-2 focus:ring-blue-500 focus:border-transparent"
                    >
                      {Object.values(PaymentTerms).map((term) => (
                        <option key={term} value={term}>
                          {getPaymentTermsText(term)}
                        </option>
                      ))}
                    </select>
                  </div>
                </div>
              </div>
            )}
          </div>
        </form>
      </div>
    </Container>
  )
}

export default CustomerEdit