class Elelem::Conversation

def add(role: :user, content: "")
  role = role.to_sym
  raise "unknown role: #{role}" unless ROLES.include?(role)
  return if content.nil? || content.empty?
  if @items.last && @items.last[:role] == role
    @items.last[:content] += content
  else
    @items.push({ role: role, content: normalize(content) })
  end
end

def history
  @items
end

def initialize(items = [{ role: "system", content: system_prompt }])
  @items = items
end

def normalize(content)
  if content.is_a?(Array)
    content.join(", ")
  else
    content.to_s
  end
end

def system_prompt
  ERB.new(Pathname.new(__dir__).join("system_prompt.erb").read).result(binding)
end