class GraphQL::Query::InputValidationResult

def self.from_problem(explanation, path = nil, extensions: nil, message: nil)
  result = self.new
  result.add_problem(explanation, path, extensions: extensions, message: message)
  result
end

def add_problem(explanation, path = nil, extensions: nil, message: nil)
  @problems ||= []
  @valid = false
  problem = { "path" => path || [], "explanation" => explanation }
  if extensions
    problem["extensions"] = extensions
  end
  if message
    problem["message"] = message
  end
  @problems.push(problem)
end

def initialize(valid: true, problems: nil)
  @valid = valid
  @problems = problems
end

def merge_result!(path, inner_result)
  return if inner_result.nil? || inner_result.valid?
  if inner_result.problems
    inner_result.problems.each do |p|
      item_path = [path, *p["path"]]
      add_problem(p["explanation"], item_path, message: p["message"], extensions: p["extensions"])
    end
  end
  # It could have been explicitly set on inner_result (if it had no problems)
  @valid = false
end

def valid?
  @valid
end