import { logContentSpacing, reprString } from '@/lib/content-spacing-debug'
import customEmojiService from '@/services/custom-emoji.service'
import { emojis, shortcodeToEmoji } from '@tiptap/extension-emoji'
import { JSONContent } from '@tiptap/react'
import { nip19 } from 'nostr-tools'

export function parseEditorJsonToText(node?: JSONContent) {
  const rawJoined = _parseEditorJsonToText(node)
  let text = rawJoined.trim()
  const trace = rawJoined.includes('nostr:') || /npub1|nprofile1/.test(rawJoined)
  if (trace) {
    logContentSpacing('parseEditorJsonToText:joined', {
      beforeTrimRepr: reprString(rawJoined),
      afterTrimRepr: reprString(text)
    })
  }
  const regex = /(?:^|\s)(nevent|naddr|nprofile|npub)1[a-zA-Z0-9]+/g

  text = text.replace(regex, (match) => {
    const trimmed = match.trim()
    const leadingSpace = match.startsWith(' ') ? ' ' : ''

    try {
      nip19.decode(trimmed)
      return `${leadingSpace}nostr:${trimmed}`
    } catch {
      return match
    }
  })

  // Ensure space before nostr: when not already preceded by space (fixes "Like:nostr:npub" and "Like:\nnostr:npub")
  const beforeNostrSpacePass = text
  text = text.replace(/(.)(?=nostr:)/g, (_, prev) => (prev === ' ' ? prev : prev + ' '))
  if (trace) {
    logContentSpacing('parseEditorJsonToText:after-nostr-prefix-pass', {
      beforeRepr: reprString(beforeNostrSpacePass),
      afterRepr: reprString(text)
    })
  }
  return text
}

function _parseEditorJsonToText(node?: JSONContent): string {
  if (!node) return ''

  if (typeof node === 'string') return node

  if (node.type === 'text') {
    return node.text || ''
  }

  if (node.type === 'hardBreak') {
    return '\n'
  }

  if (Array.isArray(node.content)) {
    return (
      node.content.map(_parseEditorJsonToText).join('') + (node.type === 'paragraph' ? '\n' : '')
    )
  }

  switch (node.type) {
    case 'paragraph':
      return '\n'
    case 'mention':
      return node.attrs ? `nostr:${node.attrs.id}` : ''
    case 'emoji':
      return parseEmojiNodeName(node.attrs?.name)
    default:
      return ''
  }
}

function parseEmojiNodeName(name?: string): string {
  if (!name) return ''
  if (customEmojiService.isCustomEmojiId(name)) {
    const custom = customEmojiService.getEmojiById(name)
    return custom ? `:${custom.shortcode}:` : `:${name}:`
  }
  const native = shortcodeToEmoji(name, emojis) ?? shortcodeToEmoji(name.replace(/\s+/g, '_'), emojis)
  return native?.emoji ?? `:${name}:`
}