// =============================================================================
// TOM Generator PDF Export
// Export TOMs to PDF format
// =============================================================================

import {
  TOMGeneratorState,
  DerivedTOM,
  CONTROL_CATEGORIES,
} from '../types'
import { getControlById } from '../controls/loader'

// =============================================================================
// TYPES
// =============================================================================

export interface PDFExportOptions {
  language: 'de' | 'en'
  includeNotApplicable: boolean
  includeEvidence: boolean
  includeGapAnalysis: boolean
  companyLogo?: string
  primaryColor?: string
  pageSize?: 'A4' | 'LETTER'
  orientation?: 'portrait' | 'landscape'
}

const DEFAULT_OPTIONS: PDFExportOptions = {
  language: 'de',
  includeNotApplicable: false,
  includeEvidence: true,
  includeGapAnalysis: true,
  primaryColor: '#1a56db',
  pageSize: 'A4',
  orientation: 'portrait',
}

// =============================================================================
// PDF CONTENT STRUCTURE
// =============================================================================

export interface PDFSection {
  type: 'title' | 'heading' | 'subheading' | 'paragraph' | 'table' | 'list' | 'pagebreak'
  content?: string
  items?: string[]
  table?: {
    headers: string[]
    rows: string[][]
  }
  style?: {
    color?: string
    fontSize?: number
    bold?: boolean
    italic?: boolean
    align?: 'left' | 'center' | 'right'
  }
}

/**
 * Generate PDF content structure for TOMs
 */
export function generatePDFContent(
  state: TOMGeneratorState,
  options: Partial<PDFExportOptions> = {}
): PDFSection[] {
  const opts = { ...DEFAULT_OPTIONS, ...options }
  const sections: PDFSection[] = []

  // Title page
  sections.push({
    type: 'title',
    content: opts.language === 'de'
      ? 'Technische und Organisatorische Maßnahmen (TOMs)'
      : 'Technical and Organizational Measures (TOMs)',
    style: { color: opts.primaryColor, fontSize: 24, bold: true, align: 'center' },
  })

  sections.push({
    type: 'paragraph',
    content: opts.language === 'de'
      ? 'gemäß Art. 32 DSGVO'
      : 'according to Art. 32 GDPR',
    style: { fontSize: 14, align: 'center' },
  })

  // Company information
  if (state.companyProfile) {
    sections.push({
      type: 'paragraph',
      content: state.companyProfile.name,
      style: { fontSize: 16, bold: true, align: 'center' },
    })

    sections.push({
      type: 'paragraph',
      content: `${opts.language === 'de' ? 'Branche' : 'Industry'}: ${Array.isArray(state.companyProfile.industry) ? state.companyProfile.industry.join(', ') : state.companyProfile.industry}`,
      style: { align: 'center' },
    })

    sections.push({
      type: 'paragraph',
      content: `${opts.language === 'de' ? 'Stand' : 'Date'}: ${new Date().toLocaleDateString(opts.language === 'de' ? 'de-DE' : 'en-US')}`,
      style: { align: 'center' },
    })
  }

  sections.push({ type: 'pagebreak' })

  // Table of Contents
  sections.push({
    type: 'heading',
    content: opts.language === 'de' ? 'Inhaltsverzeichnis' : 'Table of Contents',
    style: { color: opts.primaryColor },
  })

  const tocItems = [
    opts.language === 'de' ? '1. Zusammenfassung' : '1. Summary',
    opts.language === 'de' ? '2. Schutzbedarf' : '2. Protection Level',
    opts.language === 'de' ? '3. Maßnahmenübersicht' : '3. Measures Overview',
  ]

  let sectionNum = 4
  for (const category of CONTROL_CATEGORIES) {
    const categoryTOMs = state.derivedTOMs.filter((tom) => {
      const control = getControlById(tom.controlId)
      return control?.category === category.id &&
        (opts.includeNotApplicable || tom.applicability !== 'NOT_APPLICABLE')
    })
    if (categoryTOMs.length > 0) {
      tocItems.push(`${sectionNum}. ${category.name[opts.language]}`)
      sectionNum++
    }
  }

  if (opts.includeGapAnalysis && state.gapAnalysis) {
    tocItems.push(`${sectionNum}. ${opts.language === 'de' ? 'Lückenanalyse' : 'Gap Analysis'}`)
  }

  sections.push({
    type: 'list',
    items: tocItems,
  })

  sections.push({ type: 'pagebreak' })

  // Executive Summary
  sections.push({
    type: 'heading',
    content: opts.language === 'de' ? '1. Zusammenfassung' : '1. Summary',
    style: { color: opts.primaryColor },
  })

  const totalTOMs = state.derivedTOMs.length
  const requiredTOMs = state.derivedTOMs.filter((t) => t.applicability === 'REQUIRED').length
  const implementedTOMs = state.derivedTOMs.filter((t) => t.implementationStatus === 'IMPLEMENTED').length

  sections.push({
    type: 'paragraph',
    content: opts.language === 'de'
      ? `Dieses Dokument beschreibt die technischen und organisatorischen Maßnahmen (TOMs) gemäß Art. 32 DSGVO. Insgesamt wurden ${totalTOMs} Kontrollen bewertet, davon ${requiredTOMs} als erforderlich eingestuft. Aktuell sind ${implementedTOMs} Maßnahmen vollständig umgesetzt.`
      : `This document describes the technical and organizational measures (TOMs) according to Art. 32 GDPR. A total of ${totalTOMs} controls were evaluated, of which ${requiredTOMs} are classified as required. Currently, ${implementedTOMs} measures are fully implemented.`,
  })

  // Summary statistics table
  sections.push({
    type: 'table',
    table: {
      headers: opts.language === 'de'
        ? ['Kategorie', 'Anzahl', 'Erforderlich', 'Umgesetzt']
        : ['Category', 'Count', 'Required', 'Implemented'],
      rows: generateCategorySummary(state.derivedTOMs, opts),
    },
  })

  // Protection Level
  sections.push({
    type: 'heading',
    content: opts.language === 'de' ? '2. Schutzbedarf' : '2. Protection Level',
    style: { color: opts.primaryColor },
  })

  if (state.riskProfile) {
    sections.push({
      type: 'paragraph',
      content: opts.language === 'de'
        ? `Der ermittelte Schutzbedarf beträgt: **${formatProtectionLevel(state.riskProfile.protectionLevel, opts.language)}**`
        : `The determined protection level is: **${formatProtectionLevel(state.riskProfile.protectionLevel, opts.language)}**`,
    })

    sections.push({
      type: 'table',
      table: {
        headers: opts.language === 'de'
          ? ['Schutzziel', 'Bewertung (1-5)', 'Bedeutung']
          : ['Protection Goal', 'Rating (1-5)', 'Meaning'],
        rows: [
          [
            opts.language === 'de' ? 'Vertraulichkeit' : 'Confidentiality',
            String(state.riskProfile.ciaAssessment.confidentiality),
            getCIAMeaning(state.riskProfile.ciaAssessment.confidentiality, opts.language),
          ],
          [
            opts.language === 'de' ? 'Integrität' : 'Integrity',
            String(state.riskProfile.ciaAssessment.integrity),
            getCIAMeaning(state.riskProfile.ciaAssessment.integrity, opts.language),
          ],
          [
            opts.language === 'de' ? 'Verfügbarkeit' : 'Availability',
            String(state.riskProfile.ciaAssessment.availability),
            getCIAMeaning(state.riskProfile.ciaAssessment.availability, opts.language),
          ],
        ],
      },
    })

    if (state.riskProfile.dsfaRequired) {
      sections.push({
        type: 'paragraph',
        content: opts.language === 'de'
          ? '⚠️ HINWEIS: Aufgrund der Verarbeitung ist eine Datenschutz-Folgenabschätzung (DSFA) nach Art. 35 DSGVO erforderlich.'
          : '⚠️ NOTE: Due to the processing, a Data Protection Impact Assessment (DPIA) according to Art. 35 GDPR is required.',
        style: { bold: true, color: '#dc2626' },
      })
    }
  }

  // Measures Overview
  sections.push({
    type: 'heading',
    content: opts.language === 'de' ? '3. Maßnahmenübersicht' : '3. Measures Overview',
    style: { color: opts.primaryColor },
  })

  sections.push({
    type: 'table',
    table: {
      headers: opts.language === 'de'
        ? ['ID', 'Maßnahme', 'Anwendbarkeit', 'Status']
        : ['ID', 'Measure', 'Applicability', 'Status'],
      rows: state.derivedTOMs
        .filter((tom) => opts.includeNotApplicable || tom.applicability !== 'NOT_APPLICABLE')
        .map((tom) => [
          tom.controlId,
          tom.name,
          formatApplicability(tom.applicability, opts.language),
          formatImplementationStatus(tom.implementationStatus, opts.language),
        ]),
    },
  })

  // Detailed sections by category
  let currentSection = 4
  for (const category of CONTROL_CATEGORIES) {
    const categoryTOMs = state.derivedTOMs.filter((tom) => {
      const control = getControlById(tom.controlId)
      return control?.category === category.id &&
        (opts.includeNotApplicable || tom.applicability !== 'NOT_APPLICABLE')
    })

    if (categoryTOMs.length === 0) continue

    sections.push({ type: 'pagebreak' })

    sections.push({
      type: 'heading',
      content: `${currentSection}. ${category.name[opts.language]}`,
      style: { color: opts.primaryColor },
    })

    sections.push({
      type: 'paragraph',
      content: `${opts.language === 'de' ? 'Rechtsgrundlage' : 'Legal Basis'}: ${category.gdprReference}`,
      style: { italic: true },
    })

    for (const tom of categoryTOMs) {
      sections.push({
        type: 'subheading',
        content: `${tom.controlId}: ${tom.name}`,
      })

      sections.push({
        type: 'paragraph',
        content: tom.aiGeneratedDescription || tom.description,
      })

      sections.push({
        type: 'list',
        items: [
          `${opts.language === 'de' ? 'Typ' : 'Type'}: ${formatType(getControlById(tom.controlId)?.type || 'TECHNICAL', opts.language)}`,
          `${opts.language === 'de' ? 'Anwendbarkeit' : 'Applicability'}: ${formatApplicability(tom.applicability, opts.language)}`,
          `${opts.language === 'de' ? 'Begründung' : 'Reason'}: ${tom.applicabilityReason}`,
          `${opts.language === 'de' ? 'Umsetzungsstatus' : 'Implementation Status'}: ${formatImplementationStatus(tom.implementationStatus, opts.language)}`,
          ...(tom.responsiblePerson ? [`${opts.language === 'de' ? 'Verantwortlich' : 'Responsible'}: ${tom.responsiblePerson}`] : []),
          ...(opts.includeEvidence && tom.linkedEvidence.length > 0
            ? [`${opts.language === 'de' ? 'Verknüpfte Nachweise' : 'Linked Evidence'}: ${tom.linkedEvidence.length}`]
            : []),
        ],
      })
    }

    currentSection++
  }

  // Gap Analysis
  if (opts.includeGapAnalysis && state.gapAnalysis) {
    sections.push({ type: 'pagebreak' })

    sections.push({
      type: 'heading',
      content: `${currentSection}. ${opts.language === 'de' ? 'Lückenanalyse' : 'Gap Analysis'}`,
      style: { color: opts.primaryColor },
    })

    sections.push({
      type: 'paragraph',
      content: opts.language === 'de'
        ? `Gesamtscore: ${state.gapAnalysis.overallScore}%`
        : `Overall Score: ${state.gapAnalysis.overallScore}%`,
      style: { fontSize: 16, bold: true },
    })

    if (state.gapAnalysis.missingControls.length > 0) {
      sections.push({
        type: 'subheading',
        content: opts.language === 'de' ? 'Fehlende Maßnahmen' : 'Missing Measures',
      })

      sections.push({
        type: 'table',
        table: {
          headers: opts.language === 'de'
            ? ['ID', 'Maßnahme', 'Priorität']
            : ['ID', 'Measure', 'Priority'],
          rows: state.gapAnalysis.missingControls.map((mc) => {
            const control = getControlById(mc.controlId)
            return [
              mc.controlId,
              control?.name[opts.language] || 'Unknown',
              mc.priority,
            ]
          }),
        },
      })
    }

    if (state.gapAnalysis.recommendations.length > 0) {
      sections.push({
        type: 'subheading',
        content: opts.language === 'de' ? 'Empfehlungen' : 'Recommendations',
      })

      sections.push({
        type: 'list',
        items: state.gapAnalysis.recommendations,
      })
    }
  }

  // Footer
  sections.push({
    type: 'paragraph',
    content: opts.language === 'de'
      ? `Generiert am ${new Date().toLocaleDateString('de-DE')} mit dem TOM Generator`
      : `Generated on ${new Date().toLocaleDateString('en-US')} with the TOM Generator`,
    style: { italic: true, align: 'center', fontSize: 10 },
  })

  return sections
}

// =============================================================================
// HELPER FUNCTIONS
// =============================================================================

function generateCategorySummary(
  toms: DerivedTOM[],
  opts: PDFExportOptions
): string[][] {
  const summary: string[][] = []

  for (const category of CONTROL_CATEGORIES) {
    const categoryTOMs = toms.filter((tom) => {
      const control = getControlById(tom.controlId)
      return control?.category === category.id
    })

    if (categoryTOMs.length === 0) continue

    const required = categoryTOMs.filter((t) => t.applicability === 'REQUIRED').length
    const implemented = categoryTOMs.filter((t) => t.implementationStatus === 'IMPLEMENTED').length

    summary.push([
      category.name[opts.language],
      String(categoryTOMs.length),
      String(required),
      String(implemented),
    ])
  }

  return summary
}

function formatProtectionLevel(level: string, language: 'de' | 'en'): string {
  const levels: Record<string, Record<'de' | 'en', string>> = {
    NORMAL: { de: 'Normal', en: 'Normal' },
    HIGH: { de: 'Hoch', en: 'High' },
    VERY_HIGH: { de: 'Sehr hoch', en: 'Very High' },
  }
  return levels[level]?.[language] || level
}

function formatType(type: string, language: 'de' | 'en'): string {
  const types: Record<string, Record<'de' | 'en', string>> = {
    TECHNICAL: { de: 'Technisch', en: 'Technical' },
    ORGANIZATIONAL: { de: 'Organisatorisch', en: 'Organizational' },
  }
  return types[type]?.[language] || type
}

function formatImplementationStatus(status: string, language: 'de' | 'en'): string {
  const statuses: Record<string, Record<'de' | 'en', string>> = {
    NOT_IMPLEMENTED: { de: 'Nicht umgesetzt', en: 'Not Implemented' },
    PARTIAL: { de: 'Teilweise', en: 'Partial' },
    IMPLEMENTED: { de: 'Umgesetzt', en: 'Implemented' },
  }
  return statuses[status]?.[language] || status
}

function formatApplicability(applicability: string, language: 'de' | 'en'): string {
  const apps: Record<string, Record<'de' | 'en', string>> = {
    REQUIRED: { de: 'Erforderlich', en: 'Required' },
    RECOMMENDED: { de: 'Empfohlen', en: 'Recommended' },
    OPTIONAL: { de: 'Optional', en: 'Optional' },
    NOT_APPLICABLE: { de: 'N/A', en: 'N/A' },
  }
  return apps[applicability]?.[language] || applicability
}

function getCIAMeaning(rating: number, language: 'de' | 'en'): string {
  const meanings: Record<number, Record<'de' | 'en', string>> = {
    1: { de: 'Sehr gering', en: 'Very Low' },
    2: { de: 'Gering', en: 'Low' },
    3: { de: 'Mittel', en: 'Medium' },
    4: { de: 'Hoch', en: 'High' },
    5: { de: 'Sehr hoch', en: 'Very High' },
  }
  return meanings[rating]?.[language] || String(rating)
}

// =============================================================================
// PDF BLOB GENERATION
// Note: For production, use jspdf or pdfmake library
// =============================================================================

/**
 * Generate a PDF file as a Blob
 * This is a placeholder - in production, use jspdf or similar library
 */
export async function generatePDFBlob(
  state: TOMGeneratorState,
  options: Partial<PDFExportOptions> = {}
): Promise<Blob> {
  const content = generatePDFContent(state, options)

  // Convert to simple text-based content for now
  // In production, use jspdf library
  const textContent = content
    .map((section) => {
      switch (section.type) {
        case 'title':
          return `\n\n${'='.repeat(60)}\n${section.content}\n${'='.repeat(60)}\n`
        case 'heading':
          return `\n\n${section.content}\n${'-'.repeat(40)}\n`
        case 'subheading':
          return `\n${section.content}\n`
        case 'paragraph':
          return `${section.content}\n`
        case 'list':
          return section.items?.map((item) => `  • ${item}`).join('\n') + '\n'
        case 'table':
          if (section.table) {
            const headerLine = section.table.headers.join(' | ')
            const separator = '-'.repeat(headerLine.length)
            const rows = section.table.rows.map((row) => row.join(' | ')).join('\n')
            return `\n${headerLine}\n${separator}\n${rows}\n`
          }
          return ''
        case 'pagebreak':
          return '\n\n' + '='.repeat(60) + '\n\n'
        default:
          return ''
      }
    })
    .join('')

  return new Blob([textContent], { type: 'application/pdf' })
}

// =============================================================================
// FILENAME GENERATION
// =============================================================================

/**
 * Generate a filename for the PDF export
 */
export function generatePDFFilename(
  state: TOMGeneratorState,
  language: 'de' | 'en' = 'de'
): string {
  const companyName = state.companyProfile?.name?.replace(/[^a-zA-Z0-9]/g, '-') || 'unknown'
  const date = new Date().toISOString().split('T')[0]
  const prefix = language === 'de' ? 'TOMs' : 'TOMs'
  return `${prefix}-${companyName}-${date}.pdf`
}

// Types are exported at their definition site above