class SlatePlainSerializer
  include Interactor

  def call
    @value = context.json ? JSON.parse(context.json) : context.fail!("No string passed")
    context.text = serialize(@value["document"])
  rescue => error
    context.fail!(
      error: error
    )
  end


  def serialize(node)
    delimiter = "\n"

    if
      node["object"] === "document" ||
      (node["object"] === "block")

      node["nodes"].map { |item|
       serialize(item)
     }.join(delimiter)
    else
      node["text"] ? node["text"] : get_text(node)
    end
  end

  def is_block_list(nodes)
    nodes.all? { |item|  item["object"] == "block" }
  end


  def get_text(node)
    children = (node["object"] === "text") ? node["leaves"] : node["nodes"]
    children.reduce("") { |memo, n| memo + n["text"] }
  end
end