'use client'

// =============================================================================
// Step 1: Scope & Roles
// Company profile and role definition
// =============================================================================

import React, { useState, useEffect } from 'react'
import { useTOMGenerator } from '@/lib/sdk/tom-generator'
import {
  CompanyProfile,
  CompanyRole,
  CompanySize,
} from '@/lib/sdk/tom-generator/types'

// =============================================================================
// CONSTANTS
// =============================================================================

const COMPANY_SIZES: { value: CompanySize; label: string; description: string }[] = [
  { value: 'MICRO', label: 'Kleinstunternehmen', description: '< 10 Mitarbeiter' },
  { value: 'SMALL', label: 'Kleinunternehmen', description: '10-49 Mitarbeiter' },
  { value: 'MEDIUM', label: 'Mittelunternehmen', description: '50-249 Mitarbeiter' },
  { value: 'LARGE', label: 'Großunternehmen', description: '250-999 Mitarbeiter' },
  { value: 'ENTERPRISE', label: 'Konzern', description: '1000+ Mitarbeiter' },
]

const COMPANY_ROLES: { value: CompanyRole; label: string; description: string }[] = [
  {
    value: 'CONTROLLER',
    label: 'Verantwortlicher',
    description: 'Sie bestimmen Zweck und Mittel der Datenverarbeitung',
  },
  {
    value: 'PROCESSOR',
    label: 'Auftragsverarbeiter',
    description: 'Sie verarbeiten Daten im Auftrag eines Verantwortlichen',
  },
  {
    value: 'JOINT_CONTROLLER',
    label: 'Gemeinsam Verantwortlicher',
    description: 'Sie bestimmen gemeinsam mit anderen Zweck und Mittel',
  },
]

const INDUSTRIES = [
  'Software / IT',
  'Finanzdienstleistungen',
  'Gesundheitswesen',
  'E-Commerce / Handel',
  'Beratung / Professional Services',
  'Produktion / Industrie',
  'Bildung / Forschung',
  'Öffentlicher Sektor',
  'Medien / Kommunikation',
  'Transport / Logistik',
  'Sonstige',
]

// =============================================================================
// COMPONENT
// =============================================================================

export function ScopeRolesStep() {
  const { state, setCompanyProfile, completeCurrentStep } = useTOMGenerator()

  const [formData, setFormData] = useState<Partial<CompanyProfile>>({
    id: '',
    name: '',
    industry: '',
    size: 'MEDIUM',
    role: 'CONTROLLER',
    products: [],
    dpoPerson: '',
    dpoEmail: '',
    itSecurityContact: '',
  })

  const [productInput, setProductInput] = useState('')
  const [errors, setErrors] = useState<Record<string, string>>({})

  // Load existing data
  useEffect(() => {
    if (state.companyProfile) {
      setFormData(state.companyProfile)
    }
  }, [state.companyProfile])

  // Validation
  const validate = (): boolean => {
    const newErrors: Record<string, string> = {}

    if (!formData.name?.trim()) {
      newErrors.name = 'Unternehmensname ist erforderlich'
    }

    if (!formData.industry) {
      newErrors.industry = 'Bitte wählen Sie eine Branche'
    }

    if (!formData.role) {
      newErrors.role = 'Bitte wählen Sie eine Rolle'
    }

    if (formData.dpoEmail && !/^[^\s@]+@[^\s@]+\.[^\s@]+$/.test(formData.dpoEmail)) {
      newErrors.dpoEmail = 'Bitte geben Sie eine gültige E-Mail-Adresse ein'
    }

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

  // Handle form changes
  const handleChange = (
    e: React.ChangeEvent<HTMLInputElement | HTMLSelectElement>
  ) => {
    const { name, value } = e.target
    setFormData((prev) => ({ ...prev, [name]: value }))
    // Clear error when field is edited
    if (errors[name]) {
      setErrors((prev) => ({ ...prev, [name]: '' }))
    }
  }

  // Handle product addition
  const addProduct = () => {
    if (productInput.trim()) {
      setFormData((prev) => ({
        ...prev,
        products: [...(prev.products || []), productInput.trim()],
      }))
      setProductInput('')
    }
  }

  const removeProduct = (index: number) => {
    setFormData((prev) => ({
      ...prev,
      products: (prev.products || []).filter((_, i) => i !== index),
    }))
  }

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

    if (!validate()) return

    const profile: CompanyProfile = {
      id: formData.id || `company-${Date.now()}`,
      name: formData.name!,
      industry: formData.industry!,
      size: formData.size!,
      role: formData.role!,
      products: formData.products || [],
      dpoPerson: formData.dpoPerson || null,
      dpoEmail: formData.dpoEmail || null,
      itSecurityContact: formData.itSecurityContact || null,
    }

    setCompanyProfile(profile)
    completeCurrentStep(profile)
  }

  return (
    <form onSubmit={handleSubmit} className="space-y-6">
      {/* Company Name */}
      <div>
        <label className="block text-sm font-medium text-gray-700 mb-1">
          Unternehmensname <span className="text-red-500">*</span>
        </label>
        <input
          type="text"
          name="name"
          value={formData.name || ''}
          onChange={handleChange}
          className={`w-full px-3 py-2 border rounded-lg focus:ring-2 focus:ring-blue-500 focus:border-blue-500 ${
            errors.name ? 'border-red-500' : 'border-gray-300'
          }`}
          placeholder="z.B. Muster GmbH"
        />
        {errors.name && <p className="mt-1 text-sm text-red-500">{errors.name}</p>}
      </div>

      {/* Industry */}
      <div>
        <label className="block text-sm font-medium text-gray-700 mb-1">
          Branche <span className="text-red-500">*</span>
        </label>
        <select
          name="industry"
          value={formData.industry || ''}
          onChange={handleChange}
          className={`w-full px-3 py-2 border rounded-lg focus:ring-2 focus:ring-blue-500 focus:border-blue-500 ${
            errors.industry ? 'border-red-500' : 'border-gray-300'
          }`}
        >
          <option value="">Bitte wählen...</option>
          {INDUSTRIES.map((industry) => (
            <option key={industry} value={industry}>
              {industry}
            </option>
          ))}
        </select>
        {errors.industry && <p className="mt-1 text-sm text-red-500">{errors.industry}</p>}
      </div>

      {/* Company Size */}
      <div>
        <label className="block text-sm font-medium text-gray-700 mb-2">
          Unternehmensgröße <span className="text-red-500">*</span>
        </label>
        <div className="grid grid-cols-1 md:grid-cols-2 lg:grid-cols-3 gap-3">
          {COMPANY_SIZES.map((size) => (
            <label
              key={size.value}
              className={`relative flex items-start p-3 border rounded-lg cursor-pointer transition-all ${
                formData.size === size.value
                  ? 'border-blue-500 bg-blue-50'
                  : 'border-gray-200 hover:border-gray-300'
              }`}
            >
              <input
                type="radio"
                name="size"
                value={size.value}
                checked={formData.size === size.value}
                onChange={handleChange}
                className="sr-only"
              />
              <div>
                <span className="font-medium text-gray-900">{size.label}</span>
                <p className="text-sm text-gray-500">{size.description}</p>
              </div>
              {formData.size === size.value && (
                <div className="absolute top-2 right-2">
                  <svg className="w-5 h-5 text-blue-500" fill="currentColor" viewBox="0 0 20 20">
                    <path fillRule="evenodd" d="M10 18a8 8 0 100-16 8 8 0 000 16zm3.707-9.293a1 1 0 00-1.414-1.414L9 10.586 7.707 9.293a1 1 0 00-1.414 1.414l2 2a1 1 0 001.414 0l4-4z" clipRule="evenodd" />
                  </svg>
                </div>
              )}
            </label>
          ))}
        </div>
      </div>

      {/* Company Role */}
      <div>
        <label className="block text-sm font-medium text-gray-700 mb-2">
          Ihre Rolle nach DSGVO <span className="text-red-500">*</span>
        </label>
        <div className="space-y-3">
          {COMPANY_ROLES.map((role) => (
            <label
              key={role.value}
              className={`relative flex items-start p-4 border rounded-lg cursor-pointer transition-all ${
                formData.role === role.value
                  ? 'border-blue-500 bg-blue-50'
                  : 'border-gray-200 hover:border-gray-300'
              }`}
            >
              <input
                type="radio"
                name="role"
                value={role.value}
                checked={formData.role === role.value}
                onChange={handleChange}
                className="sr-only"
              />
              <div className="flex-1">
                <span className="font-medium text-gray-900">{role.label}</span>
                <p className="text-sm text-gray-500 mt-1">{role.description}</p>
              </div>
              {formData.role === role.value && (
                <div className="flex-shrink-0 ml-3">
                  <svg className="w-5 h-5 text-blue-500" fill="currentColor" viewBox="0 0 20 20">
                    <path fillRule="evenodd" d="M10 18a8 8 0 100-16 8 8 0 000 16zm3.707-9.293a1 1 0 00-1.414-1.414L9 10.586 7.707 9.293a1 1 0 00-1.414 1.414l2 2a1 1 0 001.414 0l4-4z" clipRule="evenodd" />
                  </svg>
                </div>
              )}
            </label>
          ))}
        </div>
        {errors.role && <p className="mt-1 text-sm text-red-500">{errors.role}</p>}
      </div>

      {/* Products/Services */}
      <div>
        <label className="block text-sm font-medium text-gray-700 mb-1">
          Produkte / Services
        </label>
        <div className="flex gap-2">
          <input
            type="text"
            value={productInput}
            onChange={(e) => setProductInput(e.target.value)}
            onKeyPress={(e) => e.key === 'Enter' && (e.preventDefault(), addProduct())}
            className="flex-1 px-3 py-2 border border-gray-300 rounded-lg focus:ring-2 focus:ring-blue-500 focus:border-blue-500"
            placeholder="z.B. Cloud CRM, API Services"
          />
          <button
            type="button"
            onClick={addProduct}
            className="px-4 py-2 bg-gray-100 text-gray-700 rounded-lg hover:bg-gray-200"
          >
            Hinzufügen
          </button>
        </div>
        {formData.products && formData.products.length > 0 && (
          <div className="flex flex-wrap gap-2 mt-2">
            {formData.products.map((product, index) => (
              <span
                key={index}
                className="inline-flex items-center gap-1 px-3 py-1 bg-blue-100 text-blue-800 rounded-full text-sm"
              >
                {product}
                <button
                  type="button"
                  onClick={() => removeProduct(index)}
                  className="hover:text-blue-600"
                >
                  <svg className="w-4 h-4" fill="none" stroke="currentColor" viewBox="0 0 24 24">
                    <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={2} d="M6 18L18 6M6 6l12 12" />
                  </svg>
                </button>
              </span>
            ))}
          </div>
        )}
      </div>

      {/* Contact Information */}
      <div className="border-t pt-6">
        <h3 className="text-lg font-medium text-gray-900 mb-4">Kontaktinformationen</h3>

        <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">
              Datenschutzbeauftragter
            </label>
            <input
              type="text"
              name="dpoPerson"
              value={formData.dpoPerson || ''}
              onChange={handleChange}
              className="w-full px-3 py-2 border border-gray-300 rounded-lg focus:ring-2 focus:ring-blue-500 focus:border-blue-500"
              placeholder="Name des DSB"
            />
          </div>

          <div>
            <label className="block text-sm font-medium text-gray-700 mb-1">
              E-Mail des DSB
            </label>
            <input
              type="email"
              name="dpoEmail"
              value={formData.dpoEmail || ''}
              onChange={handleChange}
              className={`w-full px-3 py-2 border rounded-lg focus:ring-2 focus:ring-blue-500 focus:border-blue-500 ${
                errors.dpoEmail ? 'border-red-500' : 'border-gray-300'
              }`}
              placeholder="dpo@example.de"
            />
            {errors.dpoEmail && <p className="mt-1 text-sm text-red-500">{errors.dpoEmail}</p>}
          </div>

          <div className="md:col-span-2">
            <label className="block text-sm font-medium text-gray-700 mb-1">
              IT-Security Ansprechpartner
            </label>
            <input
              type="text"
              name="itSecurityContact"
              value={formData.itSecurityContact || ''}
              onChange={handleChange}
              className="w-full px-3 py-2 border border-gray-300 rounded-lg focus:ring-2 focus:ring-blue-500 focus:border-blue-500"
              placeholder="Name oder Team"
            />
          </div>
        </div>
      </div>

      {/* Info Box */}
      <div className="bg-blue-50 border border-blue-200 rounded-lg p-4">
        <div className="flex gap-3">
          <svg className="w-5 h-5 text-blue-500 flex-shrink-0 mt-0.5" fill="currentColor" viewBox="0 0 20 20">
            <path fillRule="evenodd" d="M18 10a8 8 0 11-16 0 8 8 0 0116 0zm-7-4a1 1 0 11-2 0 1 1 0 012 0zM9 9a1 1 0 000 2v3a1 1 0 001 1h1a1 1 0 100-2v-3a1 1 0 00-1-1H9z" clipRule="evenodd" />
          </svg>
          <div>
            <h4 className="font-medium text-blue-900">Hinweis zur Rollenwahl</h4>
            <p className="text-sm text-blue-700 mt-1">
              Die Wahl Ihrer DSGVO-Rolle beeinflusst, welche TOMs für Sie relevant sind.
              Als <strong>Auftragsverarbeiter</strong> gelten zusätzliche Anforderungen nach Art. 28 DSGVO.
            </p>
          </div>
        </div>
      </div>
    </form>
  )
}

export default ScopeRolesStep