#--
# Copyright (c) 2006 Shane Vitarana
#
# Permission is hereby granted, free of charge, to any person obtaining
# a copy of this software and associated documentation files (the
# "Software"), to deal in the Software without restriction, including
# without limitation the rights to use, copy, modify, merge, publish,
# distribute, sublicense, and/or sell copies of the Software, and to
# permit persons to whom the Software is furnished to do so, subject to
# the following conditions:
#
# The above copyright notice and this permission notice shall be
# included in all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
# EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
# MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
# NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
# LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
# OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
# WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
#++

require 'net/http'
require 'xmlsimple'

HOST = 'http://youtube.com'
API = '/api2_rest'

# Module that does all the work to send out the HTTP request and retrieve
# the XML response.  Inspired by the Flickr interface by Scott Raymond
# <http://redgreenblu.com/flickr/>.

module DirtyWork
  
  # All API methods are implemented with this method.
  # This method is like a remote method call, it encapsulates
  # the request/response cycle to the remote host. It extracts
  # the remote method API name based on the ruby method name.
  private
  def method_missing(method_id, *params)
    # params[0] is the argument to the YouTube API
    request(method_id.to_s.sub('_', '.'), *params)
  end

  private
  def request(method, *params)
    response = XmlSimple.xml_in(http_get(request_url(method, *params)), { 'ForceArray' => false })
    raise response['error']['description'] if response['status'] != 'ok'
    response
  end

  private
  def request_url(method, *params)
    param_list = String.new
    params[0].each_pair do |k,v|
      param_list << "&"+k.to_s+"="+v.to_s
    end
    url = "#{HOST}#{API}?method=youtube."+method+"&dev_id="+@dev_id+param_list
  end
  
  private
  def http_get(url)
    Net::HTTP.get_response(URI.parse(url)).body.to_s
  end
end