class Typhoeus::Form

def self.finalizer(form)
  proc { Curl.formfree(form.first) }
end

def formadd_file(name, filename, contenttype, file)
  Curl.formadd(@first, @last,
    :form_option, :copyname, :pointer, name,
    :form_option, :namelength, :long, Utils.bytesize(name),
    :form_option, :file, :string, file,
    :form_option, :filename, :string, filename,
    :form_option, :contenttype, :string, contenttype,
    :form_option, :end)
end

def formadd_param(name, contents)
  Curl.formadd(@first, @last,
    :form_option, :copyname, :pointer, name,
    :form_option, :namelength, :long, Utils.bytesize(name),
    :form_option, :copycontents, :pointer, contents,
    :form_option, :contentslength, :long, Utils.bytesize(contents),
    :form_option, :end)
end

def initialize(params = {})
  @params = params
  @first = ::FFI::MemoryPointer.new(:pointer)
  @last = ::FFI::MemoryPointer.new(:pointer)
  ObjectSpace.define_finalizer(self, self.class.finalizer(self))
end

def multipart?
  !traversal[:files].empty?
end

def process!
  # add params
  traversal[:params].each { |p| formadd_param(p[0], p[1]) }
  # add files
  traversal[:files].each { |file_args| formadd_file(*file_args) }
end

def to_s
  Typhoeus::Utils.traversal_to_param_string(traversal, false)
end

def traversal
  @traversal ||= Typhoeus::Utils.traverse_params_hash(params)
end