// =============================================================================
// Obligations Document — HTML Builder: Sections 6–11
// =============================================================================

import type { Obligation, ObligationComplianceCheckResult, ObligationComplianceIssueSeverity } from '../obligations-compliance'
import { OBLIGATION_SEVERITY_LABELS_DE, OBLIGATION_SEVERITY_COLORS } from '../obligations-compliance'
import {
  STATUS_LABELS_DE,
  STATUS_BADGE_CLASSES,
  PRIORITY_LABELS_DE,
  PRIORITY_BADGE_CLASSES,
} from './types-defaults'
import { escHtml, formatDateDE, daysBetween } from './helpers'
import type { ObligationDocumentOrgHeader, ObligationDocumentRevision } from './types-defaults'

export function buildSection6(bySource: Map<string, Obligation[]>): string {
  const priorityOrder: Record<string, number> = { critical: 0, high: 1, medium: 2, low: 3 }

  let html = `
<div class="section">
  <div class="section-header">6. Detaillierte Pflichten</div>
  <div class="section-body">
`

  for (const [source, obls] of bySource.entries()) {
    const sorted = [...obls].sort((a, b) => {
      const pa = priorityOrder[a.priority] ?? 2
      const pb = priorityOrder[b.priority] ?? 2
      if (pa !== pb) return pa - pb
      return a.title.localeCompare(b.title)
    })

    html += `    <h3 style="color: #5b21b6; margin: 20px 0 10px 0; font-size: 11pt;">${escHtml(source)} <span style="font-weight: 400; font-size: 9pt; color: #64748b;">(${sorted.length} Pflichten)</span></h3>
`

    for (const o of sorted) {
      const statusLabel = STATUS_LABELS_DE[o.status] || o.status
      const statusBadge = STATUS_BADGE_CLASSES[o.status] || 'badge-draft'
      const priorityLabel = PRIORITY_LABELS_DE[o.priority] || o.priority
      const priorityBadge = PRIORITY_BADGE_CLASSES[o.priority] || 'badge-draft'
      const deadlineStr = o.deadline ? formatDateDE(o.deadline) : '—'
      const evidenceStr = o.evidence && o.evidence.length > 0
        ? o.evidence.map(e => escHtml(e)).join(', ')
        : '<em style="color: #d97706;">Kein Nachweis</em>'
      const systemsStr = o.linked_systems && o.linked_systems.length > 0
        ? o.linked_systems.map(s => escHtml(s)).join(', ')
        : '—'

      html += `
    <div class="policy-detail">
      <div class="policy-detail-header">
        <span>${escHtml(o.title)}</span>
        <span class="badge ${statusBadge}">${escHtml(statusLabel)}</span>
      </div>
      <div class="policy-detail-body">
        <table>
          <tr><th>Rechtsquelle</th><td>${escHtml(o.source)} ${escHtml(o.source_article || '')}</td></tr>
          <tr><th>Beschreibung</th><td>${escHtml(o.description || '—')}</td></tr>
          <tr><th>Prioritaet</th><td><span class="badge ${priorityBadge}">${escHtml(priorityLabel)}</span></td></tr>
          <tr><th>Status</th><td><span class="badge ${statusBadge}">${escHtml(statusLabel)}</span></td></tr>
          <tr><th>Verantwortlich</th><td>${escHtml(o.responsible || '—')}</td></tr>
          <tr><th>Frist</th><td>${deadlineStr}</td></tr>
          <tr><th>Nachweise</th><td>${evidenceStr}</td></tr>
          <tr><th>Betroffene Systeme</th><td>${systemsStr}</td></tr>
          ${o.linked_vendor_ids && o.linked_vendor_ids.length > 0 ? `<tr><th>Auftragsverarbeiter</th><td>${o.linked_vendor_ids.map(id => escHtml(id)).join(', ')}</td></tr>` : ''}
          ${o.notes ? `<tr><th>Notizen</th><td>${escHtml(o.notes)}</td></tr>` : ''}
        </table>
      </div>
    </div>
`
    }
  }

  html += `  </div>
</div>
`
  return html
}

export function buildSection7(roleMap: Map<string, Obligation[]>): string {
  let html = `
<div class="section page-break">
  <div class="section-header">7. Verantwortlichkeiten</div>
  <div class="section-body">
    <p>Die folgende Rollenmatrix zeigt, welche Personen oder Abteilungen fuer welche Pflichten
    die Umsetzungsverantwortung tragen:</p>
    <table>
      <tr><th>Verantwortlich</th><th>Pflichten</th><th>Anzahl</th><th>Davon offen</th></tr>
`
  for (const [role, obls] of roleMap.entries()) {
    const openCount = obls.filter(o => o.status !== 'completed').length
    const titles = obls.slice(0, 5).map(o => escHtml(o.title))
    const suffix = obls.length > 5 ? `, ... (+${obls.length - 5})` : ''
    html += `      <tr>
        <td>${escHtml(role)}</td>
        <td>${titles.join('; ')}${suffix}</td>
        <td>${obls.length}</td>
        <td>${openCount}</td>
      </tr>
`
  }

  html += `    </table>
  </div>
</div>
`
  return html
}

export function buildSection8(obligations: Obligation[], _today: string): string {
  const now = new Date()
  const withDeadline = obligations
    .filter(o => o.deadline && o.status !== 'completed')
    .sort((a, b) => new Date(a.deadline!).getTime() - new Date(b.deadline!).getTime())

  const overdue = withDeadline.filter(o => new Date(o.deadline!) < now)
  const upcoming = withDeadline.filter(o => new Date(o.deadline!) >= now)

  let html = `
<div class="section">
  <div class="section-header">8. Fristen und Termine</div>
  <div class="section-body">
`
  if (overdue.length > 0) {
    html += `    <h4 style="color: #dc2626; margin-bottom: 8px;">Ueberfaellige Pflichten (${overdue.length})</h4>
    <table>
      <tr><th>Pflicht</th><th>Regulierung</th><th>Frist</th><th>Tage ueberfaellig</th><th>Prioritaet</th></tr>
`
    for (const o of overdue) {
      const days = daysBetween(new Date(o.deadline!), now)
      html += `      <tr>
        <td>${escHtml(o.title)}</td>
        <td>${escHtml(o.source)}</td>
        <td>${formatDateDE(o.deadline)}</td>
        <td><span class="badge badge-critical">${days} Tage</span></td>
        <td><span class="badge ${PRIORITY_BADGE_CLASSES[o.priority] || 'badge-draft'}">${escHtml(PRIORITY_LABELS_DE[o.priority] || o.priority)}</span></td>
      </tr>
`
    }
    html += `    </table>
`
  }

  if (upcoming.length > 0) {
    html += `    <h4 style="color: #5b21b6; margin: 16px 0 8px 0;">Anstehende Fristen (${upcoming.length})</h4>
    <table>
      <tr><th>Pflicht</th><th>Regulierung</th><th>Frist</th><th>Verbleibend</th><th>Verantwortlich</th></tr>
`
    for (const o of upcoming.slice(0, 20)) {
      const days = daysBetween(now, new Date(o.deadline!))
      html += `      <tr>
        <td>${escHtml(o.title)}</td>
        <td>${escHtml(o.source)}</td>
        <td>${formatDateDE(o.deadline)}</td>
        <td>${days} Tage</td>
        <td>${escHtml(o.responsible || '—')}</td>
      </tr>
`
    }
    if (upcoming.length > 20) {
      html += `      <tr><td colspan="5" style="text-align: center; color: #64748b;">... und ${upcoming.length - 20} weitere</td></tr>
`
    }
    html += `    </table>
`
  }

  if (withDeadline.length === 0) {
    html += `    <p><em>Keine offenen Pflichten mit Fristen vorhanden.</em></p>
`
  }

  html += `  </div>
</div>
`
  return html
}

export function buildSection9(obligations: Obligation[]): string {
  const withEvidence = obligations.filter(o => o.evidence && o.evidence.length > 0)
  const withoutEvidence = obligations.filter(o => !o.evidence || o.evidence.length === 0)

  let html = `
<div class="section page-break">
  <div class="section-header">9. Nachweisverzeichnis</div>
  <div class="section-body">
    <p>${withEvidence.length} von ${obligations.length} Pflichten haben Nachweise hinterlegt.</p>
`
  if (withEvidence.length > 0) {
    html += `    <table>
      <tr><th>Pflicht</th><th>Regulierung</th><th>Nachweise</th><th>Status</th></tr>
`
    for (const o of withEvidence) {
      html += `      <tr>
        <td>${escHtml(o.title)}</td>
        <td>${escHtml(o.source)}</td>
        <td>${o.evidence!.map(e => escHtml(e)).join(', ')}</td>
        <td><span class="badge ${STATUS_BADGE_CLASSES[o.status] || 'badge-draft'}">${escHtml(STATUS_LABELS_DE[o.status] || o.status)}</span></td>
      </tr>
`
    }
    html += `    </table>
`
  }

  if (withoutEvidence.length > 0) {
    html += `    <p style="margin-top: 12px;"><strong>Pflichten ohne Nachweise (${withoutEvidence.length}):</strong></p>
    <ul style="margin: 4px 0 8px 24px; font-size: 9pt; color: #d97706;">
`
    for (const o of withoutEvidence.slice(0, 15)) {
      html += `      <li>${escHtml(o.title)} (${escHtml(o.source)})</li>
`
    }
    if (withoutEvidence.length > 15) {
      html += `      <li>... und ${withoutEvidence.length - 15} weitere</li>
`
    }
    html += `    </ul>
`
  }

  html += `  </div>
</div>
`
  return html
}

export function buildSection10(complianceResult: ObligationComplianceCheckResult | null): string {
  let html = `
<div class="section">
  <div class="section-header">10. Compliance-Status</div>
  <div class="section-body">
`
  if (complianceResult) {
    const scoreClass = complianceResult.score >= 90 ? 'score-excellent'
      : complianceResult.score >= 75 ? 'score-good'
      : complianceResult.score >= 50 ? 'score-needs-work'
      : 'score-poor'
    const scoreLabel = complianceResult.score >= 90 ? 'Ausgezeichnet'
      : complianceResult.score >= 75 ? 'Gut'
      : complianceResult.score >= 50 ? 'Verbesserungswuerdig'
      : 'Mangelhaft'

    html += `    <p><span class="score-box ${scoreClass}">${complianceResult.score}/100</span> ${escHtml(scoreLabel)}</p>
    <table style="margin-top: 12px;">
      <tr><th>Kennzahl</th><th>Wert</th></tr>
      <tr><td>Geprueft am</td><td>${formatDateDE(complianceResult.checkedAt)}</td></tr>
      <tr><td>Befunde gesamt</td><td>${complianceResult.summary.total}</td></tr>
      <tr><td>Kritisch</td><td>${complianceResult.summary.critical}</td></tr>
      <tr><td>Hoch</td><td>${complianceResult.summary.high}</td></tr>
      <tr><td>Mittel</td><td>${complianceResult.summary.medium}</td></tr>
      <tr><td>Niedrig</td><td>${complianceResult.summary.low}</td></tr>
    </table>
`
    if (complianceResult.issues.length > 0) {
      html += `    <p style="margin-top: 12px;"><strong>Befunde nach Schweregrad:</strong></p>
    <table>
      <tr><th>Schweregrad</th><th>Befund</th><th>Betroffene Pflichten</th><th>Empfehlung</th></tr>
`
      const severityOrder: ObligationComplianceIssueSeverity[] = ['CRITICAL', 'HIGH', 'MEDIUM', 'LOW']
      for (const sev of severityOrder) {
        const issuesForSev = complianceResult.issues.filter(i => i.severity === sev)
        for (const issue of issuesForSev) {
          html += `      <tr>
        <td><span class="badge badge-${sev.toLowerCase()}" style="color: ${OBLIGATION_SEVERITY_COLORS[sev]}">${OBLIGATION_SEVERITY_LABELS_DE[sev]}</span></td>
        <td>${escHtml(issue.message)}</td>
        <td>${issue.affectedObligations.length > 0 ? issue.affectedObligations.length + ' Pflicht(en)' : '—'}</td>
        <td>${escHtml(issue.recommendation)}</td>
      </tr>
`
        }
      }
      html += `    </table>
`
    } else {
      html += `    <p style="margin-top: 8px;"><em>Keine Beanstandungen. Alle Pflichten sind konform.</em></p>
`
    }
  } else {
    html += `    <p><em>Compliance-Check wurde noch nicht ausgefuehrt. Fuehren Sie den Check im
    Pflichtenregister-Tab durch, um den Status in das Dokument aufzunehmen.</em></p>
`
  }

  html += `  </div>
</div>
`
  return html
}

export function buildSection11(
  revisions: ObligationDocumentRevision[],
  orgHeader: ObligationDocumentOrgHeader,
  today: string
): string {
  let html = `
<div class="section">
  <div class="section-header">11. Aenderungshistorie</div>
  <div class="section-body">
    <table>
      <tr><th>Version</th><th>Datum</th><th>Autor</th><th>Aenderungen</th></tr>
`
  if (revisions.length > 0) {
    for (const rev of revisions) {
      html += `      <tr>
        <td>${escHtml(rev.version)}</td>
        <td>${formatDateDE(rev.date)}</td>
        <td>${escHtml(rev.author)}</td>
        <td>${escHtml(rev.changes)}</td>
      </tr>
`
    }
  } else {
    html += `      <tr>
        <td>${escHtml(orgHeader.documentVersion)}</td>
        <td>${today}</td>
        <td>${escHtml(orgHeader.dpoName || orgHeader.responsiblePerson || '—')}</td>
        <td>Erstversion des Pflichtenregisters</td>
      </tr>
`
  }

  html += `    </table>
  </div>
</div>
`
  return html
}

export function buildFooter(orgName: string, today: string, version: string): string {
  return `
<div class="page-footer">
  <span>Pflichtenregister — ${escHtml(orgName)}</span>
  <span>Stand: ${today} | Version ${escHtml(version)}</span>
</div>

</body>
</html>`
}