#
#--
# Copyright (c) 2008, John Mettraux, jmettraux@gmail.com
#
# 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.
#
# (MIT license)
#++
#

#
# John Mettraux
#
# Made in Japan
#
# 2008/02/07
#

module Rufus::RTM
    
    def self.auth_get_frob #:nodoc:

        r = milk :method => "rtm.auth.getFrob"
        r["frob"]
    end

    def self.auth_get_frob_and_url #:nodoc:

        frob = auth_get_frob

        p = {}
        p['api_key'] = API_KEY
        p['perms'] = "delete"
        p['frob'] = frob
        sign p

        [
            frob,
            AUTH_ENDPOINT + "?" + p.collect { |k, v| "#{k}=#{v}" }.join("&")
        ]
    end

    def self.auth_get_token (frob) #:nodoc:

        begin
            milk(:method => "rtm.auth.getToken", :frob => frob)['auth']['token']
        rescue Exception => e
            nil
        end
    end

    #
    # ensuring the credentials are present...

    API_KEY = ENV['RTM_API_KEY']
    SHARED_SECRET = ENV['RTM_SHARED_SECRET']

    raise "API_KEY missing from environment, cannot use Rufus::RTM" \
        unless API_KEY
    
    FROB = ENV['RTM_FROB']
    AUTH_TOKEN = ENV['RTM_AUTH_TOKEN']

    unless FROB

        frob, auth_url = auth_get_frob_and_url

        puts <<-EOS

please visit this URL with your browser and then hit 'enter' :

#{auth_url}

        EOS

        STDIN.gets
        puts "ok, now getting auth token...\n"

        auth_token = auth_get_token frob

        if auth_token

            puts <<-EOS

here are your RTM_FROB and RTM_AUTH_TOKEN, make sure to place them
in your environment :

export RTM_FROB=#{frob}
export RTM_AUTH_TOKEN=#{auth_token}

            EOS
        else

            puts <<-EOS

couldn't get auth token, please retry...

            EOS
        end

        exit 0
    end

end