import { getSermonNote, getUserByUsername, getDatabase } from '~/server/utils/database'
import { getSessionUsername } from '~/server/utils/auth'

export default defineEventHandler(async (event) => {
  const username = await getSessionUsername(event)
  
  if (!username) {
    throw createError({
      statusCode: 401,
      message: 'Unauthorized'
    })
  }

  const sermonId = parseInt(event.context.params?.sermonId || '')
  
  if (!sermonId) {
    throw createError({
      statusCode: 400,
      message: 'Invalid sermon ID'
    })
  }

  // Get user info
  const user = getUserByUsername(username)
  if (!user) {
    throw createError({
      statusCode: 400,
      message: 'User not found'
    })
  }

  // Get sermon info
  const db = getDatabase()
  const sermon = db.prepare('SELECT * FROM sermons WHERE id = ?').get(sermonId) as any
  
  if (!sermon) {
    throw createError({
      statusCode: 404,
      message: 'Sermon not found'
    })
  }

  // Get user's notes
  const noteRecord = getSermonNote(user.id!, sermonId)
  // Convert HTML to plain text for download
  const htmlToText = (html: string) => {
    if (!html) return 'No notes taken'
    return html
      .replace(/<br\s*\/?>/gi, '\n')
      .replace(/<\/p>/gi, '\n')
      .replace(/<p[^>]*>/gi, '')
      .replace(/<\/h[1-6]>/gi, '\n')
      .replace(/<h[1-6][^>]*>/gi, '')
      .replace(/<li[^>]*>/gi, '• ')
      .replace(/<\/li>/gi, '\n')
      .replace(/<[^>]+>/g, '')
      .replace(/&nbsp;/g, ' ')
      .replace(/&amp;/g, '&')
      .replace(/&lt;/g, '<')
      .replace(/&gt;/g, '>')
      .replace(/&quot;/g, '"')
      .trim()
  }
  const userNotes = htmlToText(noteRecord?.notes || '')

  // Format bible references
  let bibleReferencesText = ''
  try {
    const refs = JSON.parse(sermon.bible_references)
    bibleReferencesText = refs.map((ref: any) => 
      `${ref.reference} (${ref.version})\n${ref.text}`
    ).join('\n\n')
  } catch {
    bibleReferencesText = sermon.bible_references
  }

  // Format date
  const formatDate = (dateString: string) => {
    const date = new Date(dateString + 'T00:00:00')
    return date.toLocaleDateString('en-US', { 
      year: 'numeric', 
      month: 'long', 
      day: 'numeric' 
    })
  }

  const dates = [sermon.date]
  if (sermon.dates) {
    try {
      const additionalDates = JSON.parse(sermon.dates)
      dates.push(...additionalDates)
    } catch {}
  }
  const sermonDate = dates.map(formatDate).join(' - ')

  // Create formatted text content
  const textContent = `
================================================================================
New Life Christian Church - SERMON NOTES
================================================================================

Title: ${sermon.title}
Date: ${sermonDate}

================================================================================
BIBLE REFERENCES
================================================================================

${bibleReferencesText}

================================================================================
PERSONAL APPLIANCE
================================================================================

${sermon.personal_appliance}

================================================================================
PASTOR'S CHALLENGE
================================================================================

${sermon.pastors_challenge}

================================================================================
MY NOTES
================================================================================

${userNotes}
`.trim()

  // Set headers for file download
  setResponseHeaders(event, {
    'Content-Type': 'text/plain; charset=utf-8',
    'Content-Disposition': `attachment; filename="${sermon.slug}-notes.txt"`
  })

  return textContent
})