#
# Author:: Patrick Wright (<patrick@chef.io>)
# Copyright:: Copyright (c) 2015 Chef, Inc.
# License:: Apache License, Version 2.0
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#     http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
#

require "net/http"
require "json"
require "mixlib/install/artifact_info"

module Mixlib
  class Install
    class Backend
      class Omnitruck
        ENDPOINT = "https://omnitruck.chef.io/".freeze

        attr_accessor :options

        def initialize(options)
          @options = options
        end

        def info
          # If we are querying a single platform we need to call metadata
          # endpoint otherwise we need to call versions endpoint in omnitruck
          if options.platform
            build = omnitruck_get("metadata", p: options.platform,
                                              pv: options.platform_version,
                                              m: options.architecture,
                                              v: options.product_version
                                 )
            ArtifactInfo.from_json(build,
                                   platform: options.platform,
                                   platform_version: options.platform_version,
                                   architecture: options.architecture
            )
          else
            builds = omnitruck_get("versions", v: options.product_version)
            ArtifactInfo.from_metadata_map(builds)
          end
        end

        private

        def omnitruck_get(resource, parameters)
          uri = URI.parse(ENDPOINT)
          http = Net::HTTP.new(uri.host, uri.port)
          http.use_ssl = (uri.scheme == "https")

          path = "/#{options.channel}/#{options.product_name}/#{resource}"
          full_path = [path, URI.encode_www_form(parameters)].join("?")
          request = Net::HTTP::Get.new(full_path)
          request["Accept"] = "application/json"

          res = http.request(request)

          # Raise if response is not 2XX
          res.value
          res.body
        end
      end
    end
  end
end