#
# Copyright Michael Orlitzky
#
# http://michael.orlitzky.com/
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# http://www.fsf.org/licensing/licenses/gpl.html
#

require 'src/website'

class Howcast < Website

  VALID_HOWCAST_URL_REGEX = /^(http:\/\/)?(www\.)?howcast\.com\/videos\/(\d+)-(.+)$/

  def self.owns_url?(url)
    return url =~ VALID_HOWCAST_URL_REGEX
  end

 
  def get_video_url()
    video_id = parse_video_id()
    xml_url = "http://www.howcast.com/videos/#{video_id}.xml"
    xml_data = self.get_page_data(xml_url)
    filepath = parse_file_path_from_xml(xml_data)
    
    return "http://www.howcast.com#{filepath}"
  end

  protected;

  def parse_video_id()
    # This regex just pulls out the video id
    id_regex = /\/(\d+)-/
    matches = id_regex.match(@url)

    if matches.nil?
      raise StandardError.new('The URL is a valid Howcast URL, but does not match on the digit portion of the regex. Since the digit portion is a subset of the "valid" regex, this should never occur.')
    end
    
    return matches[1]
  end


  def parse_file_path_from_xml(data)
    file_path_regex = /<filename>(.*?)<\/filename>/
    matches = file_path_regex.match(data)

    if matches.nil?
      raise StandardError.new("Couldn't parse the <filename> tag from the XML file.")
    end

    return matches[1]
  end

end