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require 'yaml'
require 'action_mailer'
require 'sms_notifier'

# Copyright (c) 2008-2010 Brendan G. Lim (brendan@intridea.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.

module SMSFu
  RAILS_CONFIG_ROOT = defined?(Rails) ?
    (Rails.env == 'test' ? "#{File.dirname(__FILE__)}/../templates" : "#{RAILS_ROOT}/config") :
    (defined?(RAILS_ENV) ? (RAILS_ENV == 'test' ? "#{File.dirname(__FILE__)}/../templates" : "#{RAILS_ROOT}/config") : 
      "#{File.dirname(__FILE__)}/../templates")
            
  @config     ||= YAML::load(File.open("#{RAILS_CONFIG_ROOT}/sms_fu.yml"))
  @@carriers  ||= @config['carriers'] 
  @@from_address = @config['config']['from_address']
  
  class << self
    def carrier_name(key)
      carriers[key]['name']
    end

    def carriers
      @@carriers.dup
    end

    def deliver(number,carrier,message,options={})
      raise SMSFuException.new("Can't deliver blank message to #{format_number(number)}") if message.nil? or message.empty?
      options[:limit] ||= message.length
      options[:from]  ||= @@from_address
      message = message[0..options[:limit]-1]
      sms_email = sms_email(format_number(number),carrier)

      SmsNotifier.deliver_sms_message(sms_email,message,options[:from])
    rescue SMSFuException => exception
      raise exception
    end

    def sms_address(number,carrier)
      number = format_number(number)
      sms_email(number,carrier)
    end

    private

    def format_number(number)
      pre_formatted = number.gsub("-","").strip
      formatted =  (pre_formatted.length == 11 && pre_formatted[0,1] == "1") ? pre_formatted[1..pre_formatted.length] : pre_formatted
      return is_valid?(formatted) ? formatted : (raise SMSFuException.new("Phone number (#{number}) is not formatted correctly"))
    end

    def is_valid?(number)
      number.length >= 10 && number[/^.\d+$/]
    end  

    def sms_email(phone_number, carrier)
      raise SMSFuException.new("Specified carrier, #{carrier} is not supported.") unless @@carriers.has_key?(carrier.downcase)
      "#{phone_number}#{@@carriers[carrier.downcase]['value']}"
    end 
  end
   
  class SMSFuException < StandardError; end
end