require "sinatra"

module Provider
  module ProviderFactory

    @@providers = {}

    def self.providers
      @@providers.keys
    end

    def self.get provider
      p = @@providers[provider]
      raise ::Sinatra::NotFound.new("Provider #{provider} not found") if p.nil?
      p
    end

    def self.all
      @@providers.values
    end

    def self.init conf
      # require providers here to get access to debug properties
      require_all

      ["ec2", "openstack", "static"].each do |p|
        begin
          o = Provider.const_get(p.capitalize).new(conf)
          if o.configured?
            @@providers[p] = o
            puts "Provider '#{p}' has been loaded"
          end
        rescue => e
          puts "Error while loading provider '#{p}': " + e.message
          next
        end
      end
    end

    def self.require_all
      ["ec2", "openstack", "static"].each do |provider|
        begin
          require_relative provider
        rescue LoadError => e
          puts "Can not load provider '#{provider}': " + e.message
        end
      end
    end

    def self.get_account_class provider
      case(provider)
      when ::Provider::Static::PROVIDER
        ::Devops::Model::StaticProviderAccount
      when ::Provider::Ec2::PROVIDER
        ::Devops::Model::Ec2ProviderAccount
      when ::Provider::Openstack::PROVIDER
        ::Devops::Model::OpenstackProviderAccount
      else
        nil
      end
    end

  end
end