export const extractJSON = (str?: string) => {
  if (!str) return
  let firstOpen = 0,
    firstClose = 0,
    candidate = ''
  firstOpen = str.indexOf('{', firstOpen + 1)
  do {
    firstClose = str.lastIndexOf('}')
    if (firstClose <= firstOpen) {
      return
    }
    do {
      candidate = str.substring(firstOpen, firstClose + 1)
      try {
        let result = JSON.parse(candidate)
        return { result, start: firstOpen < 0 ? 0 : firstOpen, end: firstClose }
      } catch (e) {}
      firstClose = str.substring(0, firstClose).lastIndexOf('}')
    } while (firstClose > firstOpen)
    firstOpen = str.indexOf('{', firstOpen + 1)
  } while (firstOpen != -1)
}

export const parseJSON = (str?: string | null): any | undefined => {
  if (!str) return undefined
  try {
    const parsed = JSON.parse(str)
    return typeof parsed === 'object' ? parsed : undefined
  } catch (error) {
    return undefined
  }
}