import React, { useState, useEffect, useCallback } from 'react'
import { useNavigate, useParams } from 'react-router-dom'
import {
  FaSave,
  FaTimes,
  FaCog,
  FaCalendar,
  FaExclamationTriangle,
  FaMapMarkerAlt,
  FaWrench,
} from 'react-icons/fa'
import LoadingSpinner from '../../../components/common/LoadingSpinner'
import {
  CriticalityLevelEnum,
  PmWorkCenter,
  PmWorkCenterSpecification,
  WorkCenterStatusEnum,
} from '../../../types/pm'
import { mockWorkCenters } from '../../../mocks/mockWorkCenters'
import { mockDepartments } from '../../../mocks/mockDepartments'
import { HrDepartment } from '../../../types/hr'
import { Container } from '@/components/shared'
import { ROUTES_ENUM } from '@/routes/route.constant'

interface ValidationErrors {
  [key: string]: string
}

const WorkCenterForm: React.FC = () => {
  const navigate = useNavigate()
  const { id } = useParams<{ id: string }>()
  const isEdit = Boolean(id)

  const [loading, setLoading] = useState(false)
  const [saving, setSaving] = useState(false)
  const [errors, setErrors] = useState<ValidationErrors>({})
  const [departments, setDepartments] = useState<HrDepartment[]>([])

  const [formData, setFormData] = useState<PmWorkCenter>({
    id: '',
    code: '',
    name: '',
    description: '',
    workCenterId: '',
    workCenterType: {
      id: '',
      code: '',
      name: '',
      category: '',
      isActive: true,
    },
    manufacturer: '',
    model: '',
    serialNumber: '',
    installationDate: new Date('2022-03-15'),
    warrantyExpiry: new Date('2022-03-15'),
    location: '',
    departmentId: '',
    status: WorkCenterStatusEnum.Operational,
    criticality: CriticalityLevelEnum.Medium,
    specifications: [],
    maintenancePlans: [],
    workOrders: [],
    downTimeHistory: [],
    capacity: 0,
    costPerHour: 0,
    setupTime: 0,
    machineType: '',
    isActive: true,
    creationTime: new Date('2022-03-15'),
    lastModificationTime: new Date('2024-01-15'),
  })

  const loadDepartments = useCallback(async () => {
    try {
      setDepartments(mockDepartments)
    } catch (error) {
      console.error('Error loading departments:', error)
    }
  }, [])

  const loadFormData = useCallback(async () => {
    setLoading(true)
    try {
      if (isEdit && id) {
        // Simulate API call
        await new Promise((resolve) => setTimeout(resolve, 1000))
        const mockWorkCenter: PmWorkCenter = mockWorkCenters.find((eq) => eq.id === id)!

        setFormData(mockWorkCenter)
      }
    } catch (error) {
      console.error('Error loading form data:', error)
    } finally {
      setLoading(false)
    }
  }, [isEdit, id])

  useEffect(() => {
    loadDepartments()
    loadFormData()
  }, [loadDepartments, loadFormData])

  const validateForm = (): boolean => {
    const newErrors: ValidationErrors = {}

    if (!formData.code.trim()) {
      newErrors.workCenterCode = 'İş Merkezi kodu zorunludur'
    }
    if (!formData.name.trim()) {
      newErrors.name = 'İş Merkezi adı zorunludur'
    }
    if (!formData.workCenterType) {
      newErrors.workCenterType = 'İş Merkezi tipi seçilmelidir'
    }
    if (!formData.location.trim()) {
      newErrors.location = 'Lokasyon zorunludur'
    }
    if (!formData.departmentId) {
      newErrors.departmentId = 'Departman seçilmelidir'
    }
    if (!formData.installationDate) {
      newErrors.installationDate = 'Kurulum tarihi zorunludur'
    }

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

  const handleInputChange = (
    field: keyof PmWorkCenter,
    value: string | boolean | PmWorkCenterSpecification[],
  ) => {
    setFormData((prev) => ({
      ...prev,
      [field]: value,
    }))

    // Clear error when user starts typing
    if (errors[field]) {
      setErrors((prev) => ({
        ...prev,
        [field]: '',
      }))
    }
  }

  const addSpecification = () => {
    const newSpec: PmWorkCenterSpecification = {
      id: '',
      workCenterId: '',
      specificationName: '',
      specificationValue: '',
      unit: '',
      isRequired: false,
    }

    setFormData((prev) => ({
      ...prev,
      specifications: [...prev.specifications, newSpec],
    }))
  }

  const updateSpecification = (
    index: number,
    field: keyof PmWorkCenterSpecification,
    value: string | boolean,
  ) => {
    const updatedSpecs = [...formData.specifications]
    updatedSpecs[index] = { ...updatedSpecs[index], [field]: value }
    setFormData((prev) => ({
      ...prev,
      specifications: updatedSpecs,
    }))
  }

  const removeSpecification = (index: number) => {
    setFormData((prev) => ({
      ...prev,
      specifications: prev.specifications.filter((_, i) => i !== index),
    }))
  }

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

    if (!validateForm()) {
      return
    }

    setSaving(true)
    try {
      // Simulate API call
      await new Promise((resolve) => setTimeout(resolve, 2000))

      console.log('WorkCenter data:', {
        ...formData,
        id: isEdit ? id : undefined,
      })

      // Show success message
      alert(isEdit ? 'İş Merkezi başarıyla güncellendi!' : 'İş Merkezi başarıyla oluşturuldu!')

      // Navigate back to list
      navigate(ROUTES_ENUM.protected.maintenance.workcenters)
    } catch (error) {
      console.error('Error saving Workcenter:', error)
      alert('Bir hata oluştu. Lütfen tekrar deneyin.')
    } finally {
      setSaving(false)
    }
  }

  const handleCancel = () => {
    navigate(ROUTES_ENUM.protected.maintenance.workcenters)
  }

  if (loading) {
    return <LoadingSpinner />
  }

  return (
    <Container>
      <div className="space-y-2">
        {/* Header */}
        <div className="flex items-center justify-between">
          <div>
            <h2 className="text-lg font-semibold text-gray-900">
              {isEdit ? 'İş Merkezi Düzenle' : 'Yeni İş Merkezi'}
            </h2>
            <p className="text-sm text-gray-600 mt-1">
              {isEdit
                ? 'Mevcut iş merkezi bilgilerini güncelleyin'
                : 'Yeni iş merkezi bilgilerini girin'}
            </p>
          </div>
        </div>

        {/* Form */}
        <form onSubmit={handleSubmit} className="space-y-3">
          {/* Basic Information */}
          <div className="bg-white shadow rounded-lg">
            <div className="px-4 py-3 border-b border-gray-200">
              <h3 className="text-base font-medium text-gray-900 flex items-center">
                <FaCog className="w-5 h-5 mr-2" />
                Genel Bilgiler
              </h3>
            </div>

            <div className="px-4 py-3 space-y-3">
              <div className="grid grid-cols-1 md:grid-cols-2 gap-4">
                <div>
                  <label className="block text-sm font-medium text-gray-700 mb-1">
                    İş Merkezi Kodu *
                  </label>
                  <select
                    value={formData.workCenterId}
                    onChange={(e) => handleInputChange('workCenterId', e.target.value)}
                    className={`block w-full px-2.5 py-1.5 text-sm border rounded-md shadow-sm focus:outline-none focus:ring-1 ${
                      errors.workCenterId
                        ? 'border-red-300 focus:border-red-500 focus:ring-red-500'
                        : 'border-gray-300 focus:border-blue-500 focus:ring-blue-500'
                    }`}
                  >
                    <option value="">İş Merkezi Seçin</option>
                    {mockWorkCenters.map((workCenter) => (
                      <option key={workCenter.id} value={workCenter.id}>
                        {workCenter.code} - {workCenter.name}
                      </option>
                    ))}
                  </select>
                  {errors.workCenterId && (
                    <p className="mt-1 text-sm text-red-600">{errors.workCenterId}</p>
                  )}
                </div>

                <div>
                  <label className="block text-sm font-medium text-gray-700 mb-1">
                    İş Merkezi Tipi *
                  </label>
                  <select
                    value={formData.workCenterType?.id}
                    onChange={(e) => handleInputChange('workCenterType', e.target.value)}
                    className={`block w-full px-2.5 py-1.5 text-sm border rounded-md shadow-sm focus:outline-none focus:ring-1 ${
                      errors.workCenterType
                        ? 'border-red-300 focus:border-red-500 focus:ring-red-500'
                        : 'border-gray-300 focus:border-blue-500 focus:ring-blue-500'
                    }`}
                  >
                    <option value="">Tip seçin</option>
                    <option value="MACHINE">Makine</option>
                    <option value="VEHICLE">Araç</option>
                    <option value="TOOL">Alet</option>
                    <option value="FACILITY">Tesis</option>
                    <option value="SYSTEM">Sistem</option>
                    <option value="OTHER">Diğer</option>
                  </select>
                  {errors.workCenterType && (
                    <p className="mt-1 text-sm text-red-600">{errors.workCenterType}</p>
                  )}
                </div>
              </div>

              <div>
                <label className="block text-sm font-medium text-gray-700 mb-1">
                  İş Merkezi Adı *
                </label>
                <input
                  type="text"
                  value={formData.name}
                  onChange={(e) => handleInputChange('name', e.target.value)}
                  className={`block w-full px-2.5 py-1.5 text-sm border rounded-md shadow-sm focus:outline-none focus:ring-1 ${
                    errors.name
                      ? 'border-red-300 focus:border-red-500 focus:ring-red-500'
                      : 'border-gray-300 focus:border-blue-500 focus:ring-blue-500'
                  }`}
                  placeholder="İş Merkezi adı"
                />
                {errors.name && <p className="mt-1 text-sm text-red-600">{errors.name}</p>}
              </div>

              <div>
                <label className="block text-sm font-medium text-gray-700 mb-1">Açıklama</label>
                <textarea
                  value={formData.description}
                  onChange={(e) => handleInputChange('description', e.target.value)}
                  rows={2}
                  className="block w-full px-2.5 py-1.5 text-sm border border-gray-300 rounded-md shadow-sm focus:outline-none focus:ring-1 focus:border-blue-500 focus:ring-blue-500"
                  placeholder="İş Merkezi açıklaması"
                />
              </div>

              <div className="grid grid-cols-1 md:grid-cols-3 gap-4">
                <div>
                  <label className="block text-sm font-medium text-gray-700 mb-1">Üretici</label>
                  <input
                    type="text"
                    value={formData.manufacturer}
                    onChange={(e) => handleInputChange('manufacturer', e.target.value)}
                    className="block w-full px-2.5 py-1.5 text-sm border border-gray-300 rounded-md shadow-sm focus:outline-none focus:ring-1 focus:border-blue-500 focus:ring-blue-500"
                    placeholder="Üretici firma"
                  />
                </div>

                <div>
                  <label className="block text-sm font-medium text-gray-700 mb-1">Model</label>
                  <input
                    type="text"
                    value={formData.model}
                    onChange={(e) => handleInputChange('model', e.target.value)}
                    className="block w-full px-2.5 py-1.5 text-sm border border-gray-300 rounded-md shadow-sm focus:outline-none focus:ring-1 focus:border-blue-500 focus:ring-blue-500"
                    placeholder="Model numarası"
                  />
                </div>

                <div>
                  <label className="block text-sm font-medium text-gray-700 mb-1">
                    Seri Numarası
                  </label>
                  <input
                    type="text"
                    value={formData.serialNumber}
                    onChange={(e) => handleInputChange('serialNumber', e.target.value)}
                    className="block w-full px-2.5 py-1.5 text-sm border border-gray-300 rounded-md shadow-sm focus:outline-none focus:ring-1 focus:border-blue-500 focus:ring-blue-500"
                    placeholder="Seri numarası"
                  />
                </div>
              </div>
            </div>
          </div>

          {/* Location and Status */}
          <div className="bg-white shadow rounded-lg">
            <div className="px-4 py-3 border-b border-gray-200">
              <h3 className="text-base font-medium text-gray-900 flex items-center">
                <FaMapMarkerAlt className="w-5 h-5 mr-2" />
                Lokasyon ve Durum
              </h3>
            </div>

            <div className="px-4 py-3 space-y-3">
              <div>
                <label className="block text-sm font-medium text-gray-700 mb-1">Lokasyon *</label>
                <input
                  type="text"
                  value={formData.location}
                  onChange={(e) => handleInputChange('location', e.target.value)}
                  className={`block w-full px-2.5 py-1.5 text-sm border rounded-md shadow-sm focus:outline-none focus:ring-1 ${
                    errors.location
                      ? 'border-red-300 focus:border-red-500 focus:ring-red-500'
                      : 'border-gray-300 focus:border-blue-500 focus:ring-blue-500'
                  }`}
                  placeholder="İş Merkezinin bulunduğu lokasyon"
                />
                {errors.location && <p className="mt-1 text-sm text-red-600">{errors.location}</p>}
              </div>

              <div className="grid grid-cols-1 md:grid-cols-3 gap-4">
                <div>
                  <label className="block text-sm font-medium text-gray-700 mb-1">
                    Departman *
                  </label>
                  <select
                    value={formData.departmentId}
                    onChange={(e) => handleInputChange('departmentId', e.target.value)}
                    className={`block w-full px-2.5 py-1.5 text-sm border rounded-md shadow-sm focus:outline-none focus:ring-1 ${
                      errors.departmentId
                        ? 'border-red-300 focus:border-red-500 focus:ring-red-500'
                        : 'border-gray-300 focus:border-blue-500 focus:ring-blue-500'
                    }`}
                  >
                    <option value="">Departman seçin</option>
                    {departments.map((dept) => (
                      <option key={dept.id} value={dept.id}>
                        {dept.name}
                      </option>
                    ))}
                  </select>
                  {errors.departmentId && (
                    <p className="mt-1 text-sm text-red-600">{errors.departmentId}</p>
                  )}
                </div>

                <div>
                  <label className="block text-sm font-medium text-gray-700 mb-1">Durum</label>
                  <select
                    value={formData.status}
                    onChange={(e) => handleInputChange('status', e.target.value)}
                    className="block w-full px-2.5 py-1.5 text-sm border border-gray-300 rounded-md shadow-sm focus:outline-none focus:ring-1 focus:border-blue-500 focus:ring-blue-500"
                  >
                    <option value="OPERATIONAL">Çalışır Durumda</option>
                    <option value="DOWN">Arızalı</option>
                    <option value="MAINTENANCE">Bakımda</option>
                    <option value="RETIRED">Kullanım Dışı</option>
                  </select>
                </div>

                <div>
                  <label className="block text-sm font-medium text-gray-700 mb-1">
                    Kritiklik Seviyesi
                  </label>
                  <select
                    value={formData.criticality}
                    onChange={(e) => handleInputChange('criticality', e.target.value)}
                    className="block w-full px-2.5 py-1.5 text-sm border border-gray-300 rounded-md shadow-sm focus:outline-none focus:ring-1 focus:border-blue-500 focus:ring-blue-500"
                  >
                    <option value="LOW">Düşük</option>
                    <option value="MEDIUM">Orta</option>
                    <option value="HIGH">Yüksek</option>
                    <option value="CRITICAL">Kritik</option>
                  </select>
                </div>
              </div>
            </div>
          </div>

          {/* Date Information */}
          <div className="bg-white shadow rounded-lg">
            <div className="px-4 py-3 border-b border-gray-200">
              <h3 className="text-base font-medium text-gray-900 flex items-center">
                <FaCalendar className="w-5 h-5 mr-2" />
                Tarih Bilgileri
              </h3>
            </div>

            <div className="px-4 py-3 space-y-3">
              <div className="grid grid-cols-1 md:grid-cols-2 gap-4">
                <div>
                  <label className="block text-sm font-medium text-gray-700 mb-1">
                    Kurulum Tarihi *
                  </label>
                  <input
                    type="date"
                    value={formData.installationDate.toISOString()}
                    onChange={(e) => handleInputChange('installationDate', e.target.value)}
                    className={`block w-full px-2.5 py-1.5 text-sm border rounded-md shadow-sm focus:outline-none focus:ring-1 ${
                      errors.installationDate
                        ? 'border-red-300 focus:border-red-500 focus:ring-red-500'
                        : 'border-gray-300 focus:border-blue-500 focus:ring-blue-500'
                    }`}
                  />
                  {errors.installationDate && (
                    <p className="mt-1 text-sm text-red-600">{errors.installationDate}</p>
                  )}
                </div>

                <div>
                  <label className="block text-sm font-medium text-gray-700 mb-1">
                    Garanti Bitiş Tarihi
                  </label>
                  <input
                    type="date"
                    value={formData.warrantyExpiry?.toISOString()}
                    onChange={(e) => handleInputChange('warrantyExpiry', e.target.value)}
                    className="block w-full px-2.5 py-1.5 text-sm border border-gray-300 rounded-md shadow-sm focus:outline-none focus:ring-1 focus:border-blue-500 focus:ring-blue-500"
                  />
                </div>
              </div>
            </div>
          </div>

          {/* Specifications */}
          <div className="bg-white shadow rounded-lg">
            <div className="px-4 py-3 border-b border-gray-200">
              <div className="flex items-center justify-between">
                <h3 className="text-base font-medium text-gray-900 flex items-center">
                  <FaWrench className="w-5 h-5 mr-2" />
                  Teknik Özellikler
                </h3>
                <button
                  type="button"
                  onClick={addSpecification}
                  className="inline-flex items-center px-2.5 py-1.5 border border-transparent text-sm leading-4 font-medium rounded-md text-blue-700 bg-blue-100 hover:bg-blue-200 focus:outline-none focus:ring-2 focus:ring-offset-2 focus:ring-blue-500"
                >
                  <FaCog className="w-4 h-4 mr-1" />
                  Özellik Ekle
                </button>
              </div>
            </div>

            <div className="px-4 py-3">
              {formData.specifications.length === 0 ? (
                <p className="text-gray-500 text-sm">Henüz teknik özellik eklenmemiş.</p>
              ) : (
                <div className="space-y-3">
                  {formData.specifications.map((spec, index) => (
                    <div key={index} className="grid grid-cols-1 md:grid-cols-4 gap-3 items-end">
                      <div>
                        <label className="block text-sm font-medium text-gray-700 mb-1">
                          Özellik Adı
                        </label>
                        <input
                          type="text"
                          value={spec.specificationName}
                          onChange={(e) =>
                            updateSpecification(index, 'specificationName', e.target.value)
                          }
                          className="block w-full px-2.5 py-1.5 text-sm border border-gray-300 rounded-md shadow-sm focus:outline-none focus:ring-1 focus:border-blue-500 focus:ring-blue-500"
                          placeholder="Özellik adı"
                        />
                      </div>

                      <div>
                        <label className="block text-sm font-medium text-gray-700 mb-1">
                          Değer
                        </label>
                        <input
                          type="text"
                          value={spec.specificationValue}
                          onChange={(e) =>
                            updateSpecification(index, 'specificationValue', e.target.value)
                          }
                          className="block w-full px-2.5 py-1.5 text-sm border border-gray-300 rounded-md shadow-sm focus:outline-none focus:ring-1 focus:border-blue-500 focus:ring-blue-500"
                          placeholder="Değer"
                        />
                      </div>

                      <div>
                        <label className="block text-sm font-medium text-gray-700 mb-1">
                          Birim
                        </label>
                        <input
                          type="text"
                          value={spec.unit}
                          onChange={(e) => updateSpecification(index, 'unit', e.target.value)}
                          className="block w-full px-2.5 py-1.5 text-sm border border-gray-300 rounded-md shadow-sm focus:outline-none focus:ring-1 focus:border-blue-500 focus:ring-blue-500"
                          placeholder="Birim"
                        />
                      </div>

                      <div className="flex items-center space-x-2">
                        <label className="flex items-center">
                          <input
                            type="checkbox"
                            checked={spec.isRequired}
                            onChange={(e) =>
                              updateSpecification(index, 'isRequired', e.target.checked)
                            }
                            className="h-4 w-4 text-blue-600 focus:ring-blue-500 border-gray-300 rounded"
                          />
                          <span className="ml-2 text-sm text-gray-700">Zorunlu</span>
                        </label>
                        <button
                          type="button"
                          onClick={() => removeSpecification(index)}
                          className="inline-flex items-center p-1.5 border border-transparent text-sm font-medium rounded text-red-700 bg-red-100 hover:bg-red-200"
                        >
                          <FaExclamationTriangle className="w-3 h-3" />
                        </button>
                      </div>
                    </div>
                  ))}
                </div>
              )}
            </div>
          </div>

          {/* Status */}
          <div className="bg-white shadow rounded-lg">
            <div className="px-4 py-3">
              <div className="flex items-center">
                <input
                  type="checkbox"
                  id="isActive"
                  checked={formData.isActive}
                  onChange={(e) => handleInputChange('isActive', e.target.checked)}
                  className="h-4 w-4 text-blue-600 focus:ring-blue-500 border-gray-300 rounded"
                />
                <label htmlFor="isActive" className="ml-2 block text-sm text-gray-900">
                  Aktif
                </label>
              </div>
            </div>
          </div>

          {/* Form Actions */}
          <div className="flex items-center justify-end space-x-2 bg-white px-4 py-3 rounded-lg shadow">
            <button
              type="button"
              onClick={handleCancel}
              className="inline-flex items-center px-3 py-1.5 border border-gray-300 shadow-sm text-sm font-medium rounded-md text-gray-700 bg-white hover:bg-gray-50 focus:outline-none focus:ring-2 focus:ring-offset-2 focus:ring-blue-500"
            >
              <FaTimes className="w-4 h-4 mr-2" />
              İptal
            </button>
            <button
              type="submit"
              disabled={saving}
              className="inline-flex items-center px-3 py-1.5 border border-transparent text-sm font-medium rounded-md shadow-sm text-white bg-blue-600 hover:bg-blue-700 focus:outline-none focus:ring-2 focus:ring-offset-2 focus:ring-blue-500 disabled:opacity-50 disabled:cursor-not-allowed"
            >
              {saving ? (
                <>
                  <div className="animate-spin rounded-full h-4 w-4 border-b-2 border-white mr-2"></div>
                  Kaydediliyor...
                </>
              ) : (
                <>
                  <FaSave className="w-4 h-4 mr-2" />
                  {isEdit ? 'Güncelle' : 'Kaydet'}
                </>
              )}
            </button>
          </div>
        </form>
      </div>
    </Container>
  )
}

export default WorkCenterForm