import { parsePresentationProfileJson, type PresentationProfileData } from './profileJson'

export function readPresentationProfileData(jsonTag: string | undefined, content: string): PresentationProfileData | null {
  if (jsonTag) {
    return parsePresentationProfileJson(jsonTag)
  }

  // Backward compatibility: invisible format (with zero-width characters)
  const invisibleJsonMatch = content.match(/[\u200B\u200C]\[Metadata JSON\][\u200B\u200C]\n[\u200B\u200C](.+)[\u200B\u200C]$/s)
  if (invisibleJsonMatch?.[1]) {
    try {
      const cleanedJson = invisibleJsonMatch[1].replace(/[\u200B\u200C\u200D\u200E\u200F]/g, '').trim()
      return parsePresentationProfileJson(cleanedJson)
    } catch (invisibleJsonError) {
      console.error('Error parsing profile JSON from invisible content:', invisibleJsonError)
    }
  }

  // Backward compatibility: visible format
  const jsonMatch = content.match(/\[Metadata JSON\]\n(.+)$/s)
  if (jsonMatch?.[1]) {
    return parsePresentationProfileJson(jsonMatch[1].trim())
  }

  return null
}