'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'

// Helper function to render markdown to HTML
const renderMarkdownToHtml = async content => {
  if (!content) {
    return 'Aucun contenu disponible'
  }

  // Check if content contains markdown syntax
  const hasMarkdown = content.includes('**')
    || content.includes('*')
    || content.includes('#')
    || content.includes('[')
    || content.includes('`')
    || content.includes('> ')
    || content.includes('- ')
    || content.includes('1. ')

  if (!hasMarkdown) {
    // Simple text with line breaks
    return content.replaceAll('\n', '<br>')
  }

  try {
    // Dynamic import of markdown parser
    const {marked} = await import('marked')
    // Configure marked for better PDF rendering
    marked.setOptions({
      breaks: true, // Convert \n to <br>
      gfm: true, // GitHub flavored markdown
      headerIds: false, // No header IDs needed for PDF
      mangle: false // Don't mangle email addresses
    })

    return marked(content)
  } catch (error) {
    console.warn('Failed to parse markdown, falling back to plain text:', error)
    return content.replaceAll('\n', '<br>')
  }
}

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;
      `

      // Add CSS styles for markdown elements
      const styleElement = document.createElement('style')
      styleElement.textContent = `
        .pdf-content h1, .pdf-content h2, .pdf-content h3, .pdf-content h4, .pdf-content h5, .pdf-content h6 {
          margin: 20px 0 10px 0;
          font-weight: bold;
          color: #333;
        }
        .pdf-content h1 { font-size: 24px; color: #1976d2; }
        .pdf-content h2 { font-size: 20px; }
        .pdf-content h3 { font-size: 18px; }
        .pdf-content h4 { font-size: 16px; }
        .pdf-content p { margin: 10px 0; }
        .pdf-content strong, .pdf-content b { font-weight: bold; }
        .pdf-content em, .pdf-content i { font-style: italic; }
        .pdf-content ul, .pdf-content ol { 
          margin: 10px 0; 
          padding-left: 25px; 
        }
        .pdf-content li { margin: 5px 0; }
        .pdf-content blockquote { 
          margin: 15px 0; 
          padding: 10px 20px; 
          border-left: 4px solid #1976d2; 
          background-color: #f5f5f5; 
          font-style: italic; 
        }
        .pdf-content code { 
          background-color: #f5f5f5; 
          padding: 2px 4px; 
          border-radius: 3px; 
          font-family: 'Courier New', monospace; 
          font-size: 13px; 
        }
        .pdf-content pre { 
          background-color: #f5f5f5; 
          padding: 15px; 
          border-radius: 5px; 
          overflow-x: auto; 
          margin: 15px 0; 
        }
        .pdf-content pre code { 
          background: none; 
          padding: 0; 
        }
        .pdf-content a { color: #1976d2; text-decoration: underline; }
        .pdf-content hr { 
          border: none; 
          border-top: 1px solid #ccc; 
          margin: 20px 0; 
        }
        .pdf-content table { 
          border-collapse: collapse; 
          margin: 15px 0; 
          width: 100%; 
        }
        .pdf-content th, .pdf-content td { 
          border: 1px solid #ccc; 
          padding: 8px; 
          text-align: left; 
        }
        .pdf-content th { 
          background-color: #f5f5f5; 
          font-weight: bold; 
        }
      `
      document.head.append(styleElement)

      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'

      // Render markdown content to HTML
      const renderedContent = await renderMarkdownToHtml(versionData.delta?.contenu)

      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 class="pdf-content" style="font-size: 14px; line-height: 1.8; text-align: justify;">
            ${renderedContent}
          </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()
      styleElement.remove() // Clean up styles

      // 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'])
}