'use client'

import React from 'react'
import { DSFA, DSFA_SECTIONS, DSFASectionProgress } from '@/lib/sdk/dsfa/types'

interface DSFASidebarProps {
  dsfa: DSFA
  activeSection: number
  onSectionChange: (section: number) => void
}

// Calculate completion percentage for a section
function calculateSectionProgress(dsfa: DSFA, sectionNumber: number): number {
  switch (sectionNumber) {
    case 0: // Threshold Analysis
      if (!dsfa.threshold_analysis) return 0
      const ta = dsfa.threshold_analysis
      if (ta.dsfa_required !== undefined && ta.decision_justification) return 100
      if (ta.criteria_assessment?.some(c => c.applies)) return 50
      return 0

    case 1: // Processing Description
      const s1Fields = [
        dsfa.processing_purpose,
        dsfa.processing_description,
        dsfa.data_categories?.length,
        dsfa.legal_basis,
      ]
      return Math.round((s1Fields.filter(Boolean).length / s1Fields.length) * 100)

    case 2: // Necessity & Proportionality
      const s2Fields = [
        dsfa.necessity_assessment,
        dsfa.proportionality_assessment,
      ]
      return Math.round((s2Fields.filter(Boolean).length / s2Fields.length) * 100)

    case 3: // Risk Assessment
      if (!dsfa.risks?.length) return 0
      if (dsfa.overall_risk_level) return 100
      return 50

    case 4: // Mitigation Measures
      if (!dsfa.mitigations?.length) return 0
      if (dsfa.residual_risk_level) return 100
      return 50

    case 5: // Stakeholder Consultation (optional)
      if (dsfa.stakeholder_consultation_not_appropriate && dsfa.stakeholder_consultation_not_appropriate_reason) return 100
      if (dsfa.stakeholder_consultations?.length) return 100
      return 0

    case 6: // DPO & Authority Consultation
      const s6Fields = [
        dsfa.dpo_consulted,
        dsfa.dpo_opinion,
      ]
      const s6Progress = Math.round((s6Fields.filter(Boolean).length / s6Fields.length) * 100)
      // Add extra progress if authority consultation is documented when required
      if (dsfa.consultation_requirement?.consultation_required) {
        if (dsfa.authority_consulted) return s6Progress
        return Math.min(s6Progress, 75)
      }
      return s6Progress

    case 7: // Review & Maintenance
      if (!dsfa.review_schedule) return 0
      const rs = dsfa.review_schedule
      if (rs.next_review_date && rs.review_frequency_months && rs.review_responsible) return 100
      if (rs.next_review_date) return 50
      return 25

    default:
      return 0
  }
}

// Check if a section is complete
function isSectionComplete(dsfa: DSFA, sectionNumber: number): boolean {
  const progress = dsfa.section_progress
  switch (sectionNumber) {
    case 0: return progress.section_0_complete ?? false
    case 1: return progress.section_1_complete ?? false
    case 2: return progress.section_2_complete ?? false
    case 3: return progress.section_3_complete ?? false
    case 4: return progress.section_4_complete ?? false
    case 5: return progress.section_5_complete ?? false
    case 6: return progress.section_6_complete ?? false
    case 7: return progress.section_7_complete ?? false
    default: return false
  }
}

// Calculate overall DSFA progress
function calculateOverallProgress(dsfa: DSFA): number {
  const requiredSections = DSFA_SECTIONS.filter(s => s.required)
  let totalProgress = 0

  for (const section of requiredSections) {
    totalProgress += calculateSectionProgress(dsfa, section.number)
  }

  return Math.round(totalProgress / requiredSections.length)
}

export function DSFASidebar({ dsfa, activeSection, onSectionChange }: DSFASidebarProps) {
  const overallProgress = calculateOverallProgress(dsfa)

  // Group sections by category
  const thresholdSection = DSFA_SECTIONS.find(s => s.number === 0)
  const art35Sections = DSFA_SECTIONS.filter(s => s.number >= 1 && s.number <= 4)
  const stakeholderSection = DSFA_SECTIONS.find(s => s.number === 5)
  const consultationSection = DSFA_SECTIONS.find(s => s.number === 6)
  const reviewSection = DSFA_SECTIONS.find(s => s.number === 7)

  const renderSectionItem = (section: typeof DSFA_SECTIONS[0]) => {
    const progress = calculateSectionProgress(dsfa, section.number)
    const isComplete = isSectionComplete(dsfa, section.number) || progress === 100
    const isActive = activeSection === section.number

    return (
      <button
        key={section.number}
        onClick={() => onSectionChange(section.number)}
        className={`w-full flex items-center gap-3 px-3 py-2.5 rounded-lg text-left transition-all ${
          isActive
            ? 'bg-purple-100 text-purple-700'
            : 'hover:bg-gray-100 text-gray-700'
        }`}
      >
        {/* Status indicator */}
        <div className={`w-6 h-6 rounded-full flex items-center justify-center flex-shrink-0 ${
          isComplete
            ? 'bg-green-500 text-white'
            : isActive
              ? 'bg-purple-500 text-white'
              : 'bg-gray-200 text-gray-500'
        }`}>
          {isComplete ? (
            <svg className="w-4 h-4" fill="none" stroke="currentColor" viewBox="0 0 24 24">
              <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={2} d="M5 13l4 4L19 7" />
            </svg>
          ) : (
            <span className="text-xs font-medium">{section.number}</span>
          )}
        </div>

        {/* Section info */}
        <div className="flex-1 min-w-0">
          <div className="flex items-center gap-2">
            <span className={`text-sm font-medium truncate ${isActive ? 'text-purple-700' : ''}`}>
              {section.titleDE}
            </span>
            {!section.required && (
              <span className="text-[10px] px-1.5 py-0.5 bg-gray-200 text-gray-500 rounded">
                optional
              </span>
            )}
          </div>

          {/* Progress bar */}
          <div className="mt-1 h-1 bg-gray-200 rounded-full overflow-hidden">
            <div
              className={`h-full transition-all duration-300 ${
                isComplete ? 'bg-green-500' : 'bg-purple-500'
              }`}
              style={{ width: `${progress}%` }}
            />
          </div>
        </div>

        {/* Progress percentage */}
        <span className={`text-xs font-medium ${
          isComplete ? 'text-green-600' : 'text-gray-400'
        }`}>
          {progress}%
        </span>
      </button>
    )
  }

  return (
    <div className="bg-white rounded-xl border border-gray-200 p-4">
      {/* Overall Progress */}
      <div className="mb-6">
        <div className="flex items-center justify-between mb-2">
          <h3 className="text-sm font-semibold text-gray-900">DSFA Fortschritt</h3>
          <span className="text-lg font-bold text-purple-600">{overallProgress}%</span>
        </div>
        <div className="h-2 bg-gray-200 rounded-full overflow-hidden">
          <div
            className="h-full bg-gradient-to-r from-purple-500 to-purple-600 transition-all duration-500"
            style={{ width: `${overallProgress}%` }}
          />
        </div>
      </div>

      {/* Section 0: Threshold Analysis */}
      <div className="mb-4">
        <div className="text-xs font-medium text-gray-400 uppercase tracking-wider mb-2 px-3">
          Vorabpruefung
        </div>
        {thresholdSection && renderSectionItem(thresholdSection)}
      </div>

      {/* Sections 1-4: Art. 35 Abs. 7 */}
      <div className="mb-4">
        <div className="text-xs font-medium text-gray-400 uppercase tracking-wider mb-2 px-3">
          Art. 35 Abs. 7 DSGVO
        </div>
        <div className="space-y-1">
          {art35Sections.map(section => renderSectionItem(section))}
        </div>
      </div>

      {/* Section 5: Stakeholder Consultation */}
      <div className="mb-4">
        <div className="text-xs font-medium text-gray-400 uppercase tracking-wider mb-2 px-3">
          Betroffene
        </div>
        {stakeholderSection && renderSectionItem(stakeholderSection)}
      </div>

      {/* Section 6: DPO & Authority */}
      <div className="mb-4">
        <div className="text-xs font-medium text-gray-400 uppercase tracking-wider mb-2 px-3">
          Konsultation
        </div>
        {consultationSection && renderSectionItem(consultationSection)}
      </div>

      {/* Section 7: Review */}
      <div>
        <div className="text-xs font-medium text-gray-400 uppercase tracking-wider mb-2 px-3">
          Fortschreibung
        </div>
        {reviewSection && renderSectionItem(reviewSection)}
      </div>

      {/* Status Footer */}
      <div className="mt-6 pt-4 border-t border-gray-200">
        <div className="flex items-center justify-between text-sm">
          <span className="text-gray-500">Status</span>
          <span className={`px-2 py-1 rounded text-xs font-medium ${
            dsfa.status === 'draft' ? 'bg-gray-100 text-gray-600' :
            dsfa.status === 'in_review' ? 'bg-yellow-100 text-yellow-700' :
            dsfa.status === 'approved' ? 'bg-green-100 text-green-700' :
            dsfa.status === 'rejected' ? 'bg-red-100 text-red-700' :
            'bg-orange-100 text-orange-700'
          }`}>
            {dsfa.status === 'draft' ? 'Entwurf' :
             dsfa.status === 'in_review' ? 'In Pruefung' :
             dsfa.status === 'approved' ? 'Genehmigt' :
             dsfa.status === 'rejected' ? 'Abgelehnt' :
             'Ueberarbeitung'}
          </span>
        </div>

        {dsfa.version && (
          <div className="flex items-center justify-between text-sm mt-2">
            <span className="text-gray-500">Version</span>
            <span className="text-gray-700">{dsfa.version}</span>
          </div>
        )}
      </div>
    </div>
  )
}
