'use client'

import React, { useState, useEffect, Suspense } from 'react'
import { useRouter, useSearchParams } from 'next/navigation'
import Link from 'next/link'
import { useSDK } from '@/lib/sdk'
import type { AdvisoryForm } from './_types'
import { industryToDomain } from './_data'
import { StepIndicator } from './_components/StepIndicator'
import { Step1Basics } from './_components/Step1Basics'
import { Step2DataCategories } from './_components/Step2DataCategories'
import { Step3Purposes } from './_components/Step3Purposes'
import { Step4Automation } from './_components/Step4Automation'
import { Step5Hosting } from './_components/Step5Hosting'
import { Step6Transfer } from './_components/Step6Transfer'
import { Step7Retention } from './_components/Step7Retention'
import { Step8Contracts } from './_components/Step8Contracts'
import { NavigationButtons } from './_components/NavigationButtons'
import { ResultView } from './_components/ResultView'

// =============================================================================
// MAIN COMPONENT
// =============================================================================

function AdvisoryBoardPageInner() {
  const router = useRouter()
  const searchParams = useSearchParams()
  const { state: sdkState } = useSDK()
  const editId = searchParams.get('edit')
  const isEditMode = !!editId

  const [currentStep, setCurrentStep] = useState(1)
  const [isSubmitting, setIsSubmitting] = useState(false)
  const [editLoading, setEditLoading] = useState(false)
  const [result, setResult] = useState<unknown>(null)
  const [error, setError] = useState<string | null>(null)

  // Derive domain from company profile industry
  const profileIndustry = sdkState.companyProfile?.industry
  const derivedDomain = industryToDomain(
    Array.isArray(profileIndustry) ? profileIndustry : profileIndustry ? [profileIndustry] : []
  )

  // Form state — tile-based multi-select via arrays
  const [form, setForm] = useState<AdvisoryForm>({
    title: '',
    use_case_text: '',
    domain: 'general',
    category: '',
    data_categories: [],
    custom_data_types: [],
    purposes: [],
    automation: '',
    // BetrVG / works council
    employee_monitoring: false,
    hr_decision_support: false,
    works_council_consulted: false,
    // Domain-specific contexts (Annex III)
    hr_automated_screening: false,
    hr_automated_rejection: false,
    hr_candidate_ranking: false,
    hr_bias_audits: false,
    hr_agg_visible: false,
    hr_human_review: false,
    hr_performance_eval: false,
    edu_grade_influence: false,
    edu_exam_evaluation: false,
    edu_student_selection: false,
    edu_minors: false,
    edu_teacher_review: false,
    hc_diagnosis: false,
    hc_treatment: false,
    hc_triage: false,
    hc_patient_data: false,
    hc_medical_device: false,
    hc_clinical_validation: false,
    // Legal
    leg_legal_advice: false, leg_court_prediction: false, leg_client_confidential: false,
    // Public Sector
    pub_admin_decision: false, pub_benefit_allocation: false, pub_transparency: false,
    // Critical Infrastructure
    crit_grid_control: false, crit_safety_critical: false, crit_redundancy: false,
    // Automotive
    auto_autonomous: false, auto_safety: false, auto_functional_safety: false,
    // Retail
    ret_pricing: false, ret_profiling: false, ret_credit_scoring: false, ret_dark_patterns: false,
    // IT Security
    its_surveillance: false, its_threat_detection: false, its_data_retention: false,
    // Logistics
    log_driver_tracking: false, log_workload_scoring: false,
    // Construction
    con_tenant_screening: false, con_worker_safety: false,
    // Marketing
    mkt_deepfake: false, mkt_minors: false, mkt_targeting: false, mkt_labeled: false,
    // Manufacturing
    mfg_machine_safety: false, mfg_ce_required: false, mfg_validated: false,
    // Agriculture
    agr_pesticide: false, agr_animal_welfare: false, agr_environmental: false,
    // Social Services
    soc_vulnerable: false, soc_benefit: false, soc_case_mgmt: false,
    // Hospitality
    hos_guest_profiling: false, hos_dynamic_pricing: false, hos_review_manipulation: false,
    // Insurance
    ins_risk_class: false, ins_claims: false, ins_premium: false, ins_fraud: false,
    // Investment
    inv_algo_trading: false, inv_advice: false, inv_robo: false,
    // Defense
    def_dual_use: false, def_export: false, def_classified: false,
    // Supply Chain
    sch_supplier: false, sch_human_rights: false, sch_environmental: false,
    // Facility
    fac_access: false, fac_occupancy: false, fac_energy: false,
    // Sports
    spo_athlete: false, spo_fan: false, spo_doping: false,
    // Finance / Banking
    fin_credit_scoring: false, fin_aml_kyc: false, fin_algo_decisions: false, fin_customer_profiling: false,
    // General
    gen_affects_people: false, gen_automated_decisions: false, gen_sensitive_data: false,
    hosting_provider: '',
    hosting_region: '',
    model_usage: [],
    transfer_targets: [],
    transfer_countries: [],
    transfer_mechanism: '',
    retention_period: '',
    retention_purpose: '',
    contracts: [],
    subprocessors: '',
  })

  const updateForm = (updates: Partial<AdvisoryForm>) => {
    setForm(prev => ({ ...prev, ...updates }))
  }

  // Auto-set domain from profile
  useEffect(() => {
    if (!isEditMode && derivedDomain !== 'general') {
      updateForm({ domain: derivedDomain })
    }
  // eslint-disable-next-line react-hooks/exhaustive-deps
  }, [derivedDomain])

  // Pre-fill form when in edit mode
  useEffect(() => {
    if (!editId) return
    setEditLoading(true)
    fetch(`/api/sdk/v1/ucca/assessments/${editId}`)
      .then(r => r.json())
      .then(data => {
        const intake = data.intake || {}
        setForm({
          title: data.title || '',
          use_case_text: intake.use_case_text || '',
          domain: data.domain || 'general',
          category: data.category || intake.category || '',
          data_categories: intake.data_categories || [],
          custom_data_types: intake.data_types?.custom_data_types || intake.custom_data_types || [],
          purposes: intake.purposes || [],
          automation: intake.automation || '',
          hosting_provider: intake.hosting?.provider || '',
          hosting_region: intake.hosting?.region || '',
          model_usage: intake.model_usage_list || [],
          transfer_targets: intake.transfer_targets || [],
          transfer_countries: intake.international_transfer?.countries || intake.transfer_countries || [],
          transfer_mechanism: intake.transfer_mechanism || intake.international_transfer?.mechanism || '',
          retention_period: intake.retention_period || '',
          retention_purpose: intake.retention?.purpose || intake.retention_purpose || '',
          contracts: intake.contracts_list || [],
          subprocessors: intake.contracts?.subprocessors || intake.subprocessors || '',
        })
      })
      .catch(() => {})
      .finally(() => setEditLoading(false))
  }, [editId])

  const handleSubmit = async () => {
    setIsSubmitting(true)
    setError(null)
    try {
      const intake = {
        title: form.title,
        use_case_text: form.use_case_text,
        domain: form.domain,
        category: form.category,
        data_categories: form.data_categories,
        custom_data_types: form.custom_data_types.filter(s => s.trim()),
        purposes: form.purposes,
        automation: form.automation,
        hosting: {
          provider: form.hosting_provider,
          region: form.hosting_region,
        },
        model_usage_list: form.model_usage,
        transfer_targets: form.transfer_targets,
        transfer_countries: form.transfer_countries,
        transfer_mechanism: form.transfer_mechanism,
        retention_period: form.retention_period,
        retention_purpose: form.retention_purpose,
        contracts_list: form.contracts,
        subprocessors: form.subprocessors,
        employee_monitoring: form.employee_monitoring,
        hr_decision_support: form.hr_decision_support,
        works_council_consulted: form.works_council_consulted,
        // Domain-specific contexts
        hr_context: ['hr', 'recruiting'].includes(form.domain) ? {
          automated_screening: form.hr_automated_screening,
          automated_rejection: form.hr_automated_rejection,
          candidate_ranking: form.hr_candidate_ranking,
          bias_audits_done: form.hr_bias_audits,
          agg_categories_visible: form.hr_agg_visible,
          human_review_enforced: form.hr_human_review,
          performance_evaluation: form.hr_performance_eval,
        } : undefined,
        education_context: ['education', 'higher_education', 'vocational_training', 'research'].includes(form.domain) ? {
          grade_influence: form.edu_grade_influence,
          exam_evaluation: form.edu_exam_evaluation,
          student_selection: form.edu_student_selection,
          minors_involved: form.edu_minors,
          teacher_review_required: form.edu_teacher_review,
        } : undefined,
        healthcare_context: ['healthcare', 'medical_devices', 'pharma', 'elderly_care'].includes(form.domain) ? {
          diagnosis_support: form.hc_diagnosis,
          treatment_recommendation: form.hc_treatment,
          triage_decision: form.hc_triage,
          patient_data_processed: form.hc_patient_data,
          medical_device: form.hc_medical_device,
          clinical_validation: form.hc_clinical_validation,
        } : undefined,
        legal_context: ['legal', 'consulting', 'tax_advisory'].includes(form.domain) ? {
          legal_advice: form.leg_legal_advice,
          court_prediction: form.leg_court_prediction,
          client_confidential: form.leg_client_confidential,
        } : undefined,
        public_sector_context: ['public_sector', 'defense', 'justice'].includes(form.domain) ? {
          admin_decision: form.pub_admin_decision,
          benefit_allocation: form.pub_benefit_allocation,
          transparency_ensured: form.pub_transparency,
        } : undefined,
        critical_infra_context: ['energy', 'utilities', 'oil_gas'].includes(form.domain) ? {
          grid_control: form.crit_grid_control,
          safety_critical: form.crit_safety_critical,
          redundancy_exists: form.crit_redundancy,
        } : undefined,
        automotive_context: ['automotive', 'aerospace'].includes(form.domain) ? {
          autonomous_driving: form.auto_autonomous,
          safety_relevant: form.auto_safety,
          functional_safety: form.auto_functional_safety,
        } : undefined,
        retail_context: ['retail', 'ecommerce', 'wholesale'].includes(form.domain) ? {
          pricing_personalized: form.ret_pricing,
          credit_scoring: form.ret_credit_scoring,
          dark_patterns: form.ret_dark_patterns,
        } : undefined,
        it_security_context: ['it_services', 'cybersecurity', 'telecom'].includes(form.domain) ? {
          employee_surveillance: form.its_surveillance,
          threat_detection: form.its_threat_detection,
          data_retention_logs: form.its_data_retention,
        } : undefined,
        logistics_context: ['logistics'].includes(form.domain) ? {
          driver_tracking: form.log_driver_tracking,
          workload_scoring: form.log_workload_scoring,
        } : undefined,
        construction_context: ['construction', 'real_estate', 'facility_management'].includes(form.domain) ? {
          tenant_screening: form.con_tenant_screening,
          worker_safety: form.con_worker_safety,
        } : undefined,
        marketing_context: ['marketing', 'media', 'entertainment'].includes(form.domain) ? {
          deepfake_content: form.mkt_deepfake,
          behavioral_targeting: form.mkt_targeting,
          minors_targeted: form.mkt_minors,
          ai_content_labeled: form.mkt_labeled,
        } : undefined,
        manufacturing_context: ['mechanical_engineering', 'electrical_engineering', 'plant_engineering', 'chemicals', 'food_beverage'].includes(form.domain) ? {
          machine_safety: form.mfg_machine_safety,
          ce_marking_required: form.mfg_ce_required,
          safety_validated: form.mfg_validated,
        } : undefined,
        agriculture_context: ['agriculture', 'forestry', 'fishing'].includes(form.domain) ? {
          pesticide_ai: form.agr_pesticide,
          animal_welfare: form.agr_animal_welfare,
          environmental_data: form.agr_environmental,
        } : undefined,
        social_services_context: ['social_services', 'nonprofit'].includes(form.domain) ? {
          vulnerable_groups: form.soc_vulnerable,
          benefit_decision: form.soc_benefit,
          case_management: form.soc_case_mgmt,
        } : undefined,
        hospitality_context: ['hospitality', 'tourism'].includes(form.domain) ? {
          guest_profiling: form.hos_guest_profiling,
          dynamic_pricing: form.hos_dynamic_pricing,
          review_manipulation: form.hos_review_manipulation,
        } : undefined,
        insurance_context: ['insurance'].includes(form.domain) ? {
          risk_classification: form.ins_risk_class,
          claims_automation: form.ins_claims,
          premium_calculation: form.ins_premium,
          fraud_detection: form.ins_fraud,
        } : undefined,
        investment_context: ['investment'].includes(form.domain) ? {
          algo_trading: form.inv_algo_trading,
          investment_advice: form.inv_advice,
          robo_advisor: form.inv_robo,
        } : undefined,
        defense_context: ['defense'].includes(form.domain) ? {
          dual_use: form.def_dual_use,
          export_controlled: form.def_export,
          classified_data: form.def_classified,
        } : undefined,
        supply_chain_context: ['textiles', 'packaging'].includes(form.domain) ? {
          supplier_monitoring: form.sch_supplier,
          human_rights_check: form.sch_human_rights,
          environmental_impact: form.sch_environmental,
        } : undefined,
        facility_context: ['facility_management'].includes(form.domain) ? {
          access_control_ai: form.fac_access,
          occupancy_tracking: form.fac_occupancy,
          energy_optimization: form.fac_energy,
        } : undefined,
        sports_context: ['sports'].includes(form.domain) ? {
          athlete_tracking: form.spo_athlete,
          fan_profiling: form.spo_fan,
        } : undefined,
        store_raw_text: true,
        // Finance/Banking and General don't need separate context structs —
        // their fields are evaluated via existing FinancialContext or generic rules
      }

      const url = isEditMode
        ? `/api/sdk/v1/ucca/assessments/${editId}`
        : '/api/sdk/v1/ucca/assess'
      const method = isEditMode ? 'PUT' : 'POST'

      const response = await fetch(url, {
        method,
        headers: { 'Content-Type': 'application/json' },
        body: JSON.stringify(intake),
      })

      if (!response.ok) {
        const errData = await response.json().catch(() => null)
        throw new Error(errData?.error || `HTTP ${response.status}`)
      }

      if (isEditMode) {
        router.push(`/sdk/use-cases/${editId}`)
        return
      }

      const data = await response.json()
      setResult(data)
    } catch (err) {
      setError(err instanceof Error ? err.message : 'Fehler bei der Bewertung')
    } finally {
      setIsSubmitting(false)
    }
  }

  // If we have a result, show it
  if (result) {
    return (
      <ResultView
        result={result}
        onGoToAssessment={(id) => router.push(`/sdk/use-cases/${id}`)}
        onGoToOverview={() => router.push('/sdk/use-cases')}
      />
    )
  }

  return (
    <div className="max-w-3xl mx-auto space-y-6">
      {/* Header */}
      <div className="flex items-center justify-between">
        <div>
          <h1 className="text-2xl font-bold text-gray-900">
            {isEditMode ? 'Assessment bearbeiten' : 'Use Case Workshop'}
          </h1>
          <p className="mt-1 text-gray-500">
            {isEditMode
              ? 'Angaben anpassen und Assessment neu bewerten'
              : 'Erfassen Sie Ihren KI-Anwendungsfall Schritt fuer Schritt'}
          </p>
        </div>
        <Link
          href="/sdk/advisory-board/documentation"
          className="inline-flex items-center gap-2 px-4 py-2 text-sm text-purple-600 hover:text-purple-700 hover:bg-purple-50 border border-purple-300 rounded-lg transition-colors"
        >
          UCCA-Dokumentation
        </Link>
      </div>

      {/* Edit loading indicator */}
      {editLoading && (
        <div className="bg-purple-50 border border-purple-200 rounded-lg p-4 text-purple-700 text-sm">
          Lade Assessment-Daten...
        </div>
      )}

      <StepIndicator currentStep={currentStep} onStepClick={setCurrentStep} />

      {/* Error */}
      {error && (
        <div className="bg-red-50 border border-red-200 rounded-lg p-4 text-red-700">{error}</div>
      )}

      {/* Step Content */}
      <div className="bg-white rounded-xl border border-gray-200 p-6">
        {currentStep === 1 && (
          <Step1Basics form={form} updateForm={updateForm} profileIndustry={profileIndustry} />
        )}
        {currentStep === 2 && <Step2DataCategories form={form} updateForm={updateForm} />}
        {currentStep === 3 && <Step3Purposes form={form} updateForm={updateForm} />}
        {currentStep === 4 && <Step4Automation form={form} updateForm={updateForm} />}
        {currentStep === 5 && <Step5Hosting form={form} updateForm={updateForm} />}
        {currentStep === 6 && <Step6Transfer form={form} updateForm={updateForm} />}
        {currentStep === 7 && <Step7Retention form={form} updateForm={updateForm} />}
        {currentStep === 8 && <Step8Contracts form={form} updateForm={updateForm} />}
      </div>

      <NavigationButtons
        currentStep={currentStep}
        isSubmitting={isSubmitting}
        isEditMode={isEditMode}
        titleEmpty={!form.title}
        onBack={() => currentStep > 1 ? setCurrentStep(currentStep - 1) : router.push('/sdk/use-cases')}
        onNext={() => setCurrentStep(currentStep + 1)}
        onSubmit={handleSubmit}
      />
    </div>
  )
}

export default function AdvisoryBoardPage() {
  return (
    <Suspense fallback={<div className="flex items-center justify-center h-64 text-gray-500">Lade...</div>}>
      <AdvisoryBoardPageInner />
    </Suspense>
  )
}
