konstitisyon.nu/components/versions/export-pdf-button.js

'use client'

import {useState} from 'react'
import PropTypes from 'prop-types'
import Button from '@mui/material/Button'
import CircularProgress from '@mui/material/CircularProgress'
import PictureAsPdfIcon from '@mui/icons-material/PictureAsPdf'
import {formatDate} from '@/lib/format.js'

export default function ExportPdfButton({versionData, size = 'medium', variant = 'outlined'}) {
  const [isExporting, setIsExporting] = useState(false)

  const handleExportPdf = async () => {
    setIsExporting(true)

    try {
      const {default: jsPDF} = await import('jspdf')
      const {default: html2canvas} = await import('html2canvas')

      // Créer un élément temporaire avec le contenu formaté
      const tempDiv = document.createElement('div')
      tempDiv.style.cssText = `
        padding: 40px;
        font-family: 'Roboto', Arial, sans-serif;
        line-height: 1.6;
        color: #333;
        background-color: white;
        width: 210mm;
        position: fixed;
        top: -9999px;
        left: -9999px;
        z-index: -1;
      `

      const authorName = versionData.user_created?.split('-')[0] || 'Système'
      const createdAt = new Date(versionData.date_created)
      const threeDaysAgo = new Date(Date.now() - (3 * 24 * 60 * 60 * 1000))
      const voteStatus = createdAt < threeDaysAgo ? 'fermé' : 'ouvert'
      const voteColor = voteStatus === 'ouvert' ? '#2e7d32' : '#d32f2f'

      tempDiv.innerHTML = `
        <div style="margin-bottom: 30px; border-bottom: 2px solid #1976d2; padding-bottom: 20px;">
          <h1 style="color: #1976d2; margin: 0 0 10px 0; font-size: 28px; font-weight: bold;">
            ${versionData.name}
          </h1>
          <div style="margin-top: 15px;">
            <p style="margin: 5px 0; color: #666; font-size: 14px;">
              <strong>Auteur :</strong> @${authorName}
            </p>
            <p style="margin: 5px 0; color: #666; font-size: 14px;">
              <strong>Date de création :</strong> ${formatDate(versionData.date_created, 'PPpp')}
            </p>
            <p style="margin: 5px 0; color: #666; font-size: 14px;">
              <strong>Statut du vote :</strong> 
              <span style="color: ${voteColor}; font-weight: bold;">${voteStatus}</span>
            </p>
          </div>
        </div>
        
        <div style="margin-bottom: 20px;">
          <h2 style="color: #333; font-size: 20px; margin-bottom: 15px; font-weight: bold;">
            Contenu
          </h2>
          <div style="white-space: pre-wrap; font-size: 14px; line-height: 1.8; text-align: justify;">
            ${versionData.delta?.contenu || 'Aucun contenu disponible'}
          </div>
        </div>
        
        <div style="margin-top: 40px; padding-top: 20px; border-top: 1px solid #eee; font-size: 12px; color: #888; text-align: center;">
          Exporté depuis Konstitisyon.la le ${formatDate(new Date(), 'PPpp')}
        </div>
      `

      document.body.append(tempDiv)

      // Générer le canvas avec une meilleure qualité
      const canvas = await html2canvas(tempDiv, {
        scale: 2,
        useCORS: true,
        allowTaint: true,
        backgroundColor: '#ffffff',
        width: tempDiv.scrollWidth,
        height: tempDiv.scrollHeight
      })

      tempDiv.remove()

      // Créer le PDF
      const imgData = canvas.toDataURL('image/png', 1)
      const pdf = new jsPDF('p', 'mm', 'a4') // eslint-disable-line new-cap

      const pageWidth = pdf.internal.pageSize.getWidth()
      const pageHeight = pdf.internal.pageSize.getHeight()
      const imgWidth = pageWidth
      const imgHeight = (canvas.height * imgWidth) / canvas.width

      let heightLeft = imgHeight
      let position = 0

      // Ajouter la première page
      pdf.addImage(imgData, 'PNG', 0, position, imgWidth, imgHeight)
      heightLeft -= pageHeight

      // Ajouter des pages supplémentaires si nécessaire
      while (heightLeft >= 0) {
        position = heightLeft - imgHeight
        pdf.addPage()
        pdf.addImage(imgData, 'PNG', 0, position, imgWidth, imgHeight)
        heightLeft -= pageHeight
      }

      // Nom du fichier sécurisé
      const fileName = `${versionData.name.replaceAll(/[^a-zA-Z\d\s]/g, '').replaceAll(/\s+/g, '_')}_${formatDate(new Date(), 'yyyy-MM-dd')}.pdf`
      pdf.save(fileName)
    } catch (error) {
      console.error('Erreur lors de l\'export PDF:', error)
    } finally {
      setIsExporting(false)
    }
  }

  return (
    <Button
      variant={variant}
      size={size}
      startIcon={isExporting ? <CircularProgress size={16} /> : <PictureAsPdfIcon />}
      disabled={isExporting}
      sx={{
        minWidth: size === 'small' ? 'auto' : undefined,
        '&:disabled': {
          opacity: 0.6
        }
      }}
      onClick={handleExportPdf}
    >
      {isExporting ? 'Export...' : (size === 'small' ? 'PDF' : 'Exporter PDF')}
    </Button>
  )
}

ExportPdfButton.propTypes = {
  versionData: PropTypes.object.isRequired,
  size: PropTypes.oneOf(['small', 'medium', 'large']),
  variant: PropTypes.oneOf(['text', 'outlined', 'contained'])
}