require "rack/request"
require "cgi"

module ChefZero
  class RestRequest
    def initialize(env, rest_base_prefix = [])
      @env = env
      @rest_base_prefix = rest_base_prefix
    end

    attr_reader :env
    attr_accessor :rest_base_prefix

    def base_uri
      # Load balancer awareness
      if env["HTTP_X_FORWARDED_PROTO"]
        scheme = env["HTTP_X_FORWARDED_PROTO"]
      else
        scheme = env["rack.url_scheme"]
      end
      @base_uri ||= "#{scheme}://#{env["HTTP_HOST"]}#{env["SCRIPT_NAME"]}"
    end

    def base_uri=(value)
      @base_uri = value
    end

    def api_version
      Integer(@env["HTTP_X_OPS_SERVER_API_VERSION"] || 0)
    end

    def api_v0?
      api_version == 0
    end

    def requestor
      @env["HTTP_X_OPS_USERID"]
    end

    def method
      @env["REQUEST_METHOD"]
    end

    def rest_path
      @rest_path ||= rest_base_prefix + env["PATH_INFO"].split("/").select { |part| part != "" }
    end

    def rest_path=(rest_path)
      @rest_path = rest_path
    end

    def body=(body)
      @body = body
    end

    def body
      @body ||= env["rack.input"].read
    end

    def query_params
      @query_params ||= begin
        params = Rack::Request.new(env).GET
        params.keys.each do |key|
          params[key] = self.class.rfc2396_parser.unescape(params[key])
        end
        params
      end
    end

    def to_s
      result = "#{method} #{rest_path.join("/")}"
      if query_params.size > 0
        result << "?#{query_params.map { |k, v| "#{k}=#{v}" }.join("&")}"
      end
      if body.chomp != ""
        result << "\n--- #{method} BODY ---\n"
        result << body
        result << "\n" unless body.end_with?("\n")
        result << "--- END #{method} BODY ---"
      end
      result
    end

    def self.rfc2396_parser
      @parser ||= URI::RFC2396_Parser.new
    end
  end
end