import type { Event } from 'nostr-tools'
import type { Article } from '@/types/nostr'

/**
 * Parse article metadata from Nostr event
 */
export function parseArticleFromEvent(event: Event): Article | null {
  try {
    const content = event.content

    // Parse article metadata from tags
    const titleTag = event.tags.find((tag) => tag[0] === 'title')
    const previewTag = event.tags.find((tag) => tag[0] === 'preview')
    const zapTag = event.tags.find((tag) => tag[0] === 'zap')
    const invoiceTag = event.tags.find((tag) => tag[0] === 'invoice')
    const paymentHashTag = event.tags.find((tag) => tag[0] === 'payment_hash')

    const title = titleTag?.[1] || 'Untitled'
    const preview = previewTag?.[1] || content.substring(0, 200)
    const zapAmount = zapTag ? parseInt(zapTag[1] || '800') : 800

    // Extract invoice information from tags
    const invoice = invoiceTag?.[1] || undefined
    const paymentHash = paymentHashTag?.[1] || undefined

    // Split content: preview is in the note, full content is in private message
    const lines = content.split('\n')
    const previewContent = preview || lines[0] || content.substring(0, 200)

    return {
      id: event.id,
      pubkey: event.pubkey,
      title,
      preview: previewContent,
      content: '', // Full content will be loaded from private message
      createdAt: event.created_at,
      zapAmount,
      paid: false,
      invoice,
      paymentHash,
    }
  } catch (e) {
    console.error('Error parsing article:', e)
    return null
  }
}