module Fog
  module Compute
    class Google
      class Mock
        def get_server(server_name, zone_name)
          server = self.data[:servers][server_name]
          get_zone(zone_name)
          zone = self.data[:zones][zone_name]
          if server.nil? or server["zone"] != zone["selfLink"]
            return build_excon_response({
              "error" => {
                "errors" => [
                 {
                  "domain" => "global",
                  "reason" => "notFound",
                  "message" => "The resource 'projects/#{@project}/zones/#{zone_name}/instances/#{server_name}' was not found"
                 }
                ],
                "code" => 404,
                "message" => "The resource 'projects/#{@project}/zones/#{zone_name}/instances/#{server_name}' was not found"
              }
            })
          end

          # transition the server through the provisioning -> staging -> running states
          creation_time = Time.iso8601(server['creationTimestamp'])
          case server['status']
          when 'PROVISIONING'
            if Time.now - creation_time > Fog::Mock.delay/2
              server['status'] = 'STAGING'
            end
          when 'STAGING'
            if Time.now - creation_time > Fog::Mock.delay
              server['status'] = 'RUNNING'
            end
          when 'STOPPED'
            if server['mock-deletionTimestamp']
              # stopped -> terminated
              if Time.now - Time.iso8601(server['mock-deletionTimestamp']) > Fog::Mock.delay
                server['status'] = 'TERMINATED'
              end
            else
              # TODO stopped -> provisioning
            end
          when 'TERMINATED'
            if Time.now - Time.iso8601(server['mock-deletionTimestamp']) > Fog::Mock.delay
              self.data[:servers][server_name] = nil
            end
          end

          build_excon_response(server)
        end
      end

      class Real
        def get_server(server_name, zone_name)
          if zone_name.is_a? Excon::Response
            zone = zone_name.body["name"]
          else
            zone = zone_name
          end

          api_method = @compute.instances.get
          parameters = {
            'project' => @project,
            'zone' => zone,
            'instance' => server_name
          }

          request(api_method, parameters)
        end
      end
    end
  end
end