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Sisal::Providers::TropoProvider(token: '123')

module Sisal
  class Configuration
    def self.default
      config = new

      config.provider(:twilio,     :class => TwilioProvider)
      config.provider(:tropo,      :class => TropoProvider)
      config.provider(:clickatell, :class => ClickatellProvider)

      config
    end

    def initialize
      self.providers = Hash.new { |h,k| h[k] = {} }
    end

    def provider(name, params)
      providers[name].update(params)
    end

    # override the provide rather than merging
    def provider!(name, params)
      providers[name] = params
    end

    def default_provider
      providers[default_provider]
    end

    attr_accessor :providers
    attr_writer :default_provider
  end
end

module Sisal
  class << self
    def configuration
      self.configuration ||= Configuration.default
    end

    attr_writer :configuration
  end
end

config = Sisal.configuration

config.default_provider = :tropo

config.provider(:tropo, token: '123')
config.provider(:clickatell, api_id: '123', user: 'user', password: 'pass')
config.provider(:twilio, account_id: '123', token: '123', from: '552500')

config = Sisal.configuration

config.default_provider = :something

# add a new kind of provider
config.provider(:something, :class => SomethingProvider, ...)

# edit an existing provider
config.provider(:twilio, :token => "...")

# replace an existing provider's params
config.provider!(:tropo, :class => MyCustomTropoProvider, ...)

Sisal.configuration = ZomgObject
# ... you're on your own, buddy.