type TipTapNode = {
  type?: string
  text?: string
  content?: TipTapNode[]
}

/** True when TipTap JSON has no meaningful text (blank doc / empty paragraph). */
export function isEmptyTipTapDoc(content: Record<string, unknown> | null | undefined): boolean {
  if (!content) return true
  return !tipTapNodeHasText(content as TipTapNode)
}

/** Ensure TipTap JSON is a valid editable doc (at least one block node). */
export function ensureMinimalTipTapDoc(
  content: Record<string, unknown> | null | undefined
): Record<string, unknown> {
  if (
    content &&
    content.type === "doc" &&
    Array.isArray(content.content) &&
    content.content.length > 0
  ) {
    return content
  }
  return { type: "doc", content: [{ type: "paragraph" }] }
}

function tipTapNodeHasText(node: TipTapNode | TipTapNode[] | null | undefined): boolean {
  if (!node) return false
  if (Array.isArray(node)) {
    return node.some((child) => tipTapNodeHasText(child))
  }
  if (typeof node.text === "string" && node.text.trim() !== "") {
    return true
  }
  if (Array.isArray(node.content)) {
    return node.content.some((child) => tipTapNodeHasText(child))
  }
  return false
}