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require 'net/https'
require 'ipaddr'

module Selenium
  module WebDriver
    module Remote
      module Http
        # @api private
        class Default < Common
          attr_accessor :proxy

          private

          def http
            @http ||= (
            http = new_http_client
            if server_url.scheme == 'https'
              http.use_ssl = true
              http.verify_mode = OpenSSL::SSL::VERIFY_NONE
            end

            if @timeout
              http.open_timeout = @timeout
              http.read_timeout = @timeout
            end

            http
            )
          end

          MAX_RETRIES = 3

          def request(verb, url, headers, payload, redirects = 0)
            retries = 0

            begin
              request = new_request_for(verb, url, headers, payload)
              response = response_for(request)
            rescue Errno::ECONNABORTED, Errno::ECONNRESET, Errno::EADDRINUSE
              # a retry is sometimes needed on Windows XP where we may quickly
              # run out of ephemeral ports
              #
              # A more robust solution is bumping the MaxUserPort setting
              # as described here:
              #
              # http://msdn.microsoft.com/en-us/library/aa560610%28v=bts.20%29.aspx
              raise if retries >= MAX_RETRIES
              retries += 1

              retry
            rescue Errno::EADDRNOTAVAIL => ex
              # a retry is sometimes needed when the port becomes temporarily unavailable
              raise if retries >= MAX_RETRIES
              retries += 1
              sleep 2
              retry

            rescue Errno::ECONNREFUSED => ex
              raise ex.class, "using proxy: #{proxy.http}" if use_proxy?
              raise
            end

            if response.is_a? Net::HTTPRedirection
              raise Error::WebDriverError, 'too many redirects' if redirects >= MAX_REDIRECTS
              request(:get, URI.parse(response['Location']), DEFAULT_HEADERS.dup, nil, redirects + 1)
            else
              create_response response.code, response.body, response.content_type
            end
          end

          def new_request_for(verb, url, headers, payload)
            req = Net::HTTP.const_get(verb.to_s.capitalize).new(url.path, headers)

            if server_url.userinfo
              req.basic_auth server_url.user, server_url.password
            end

            req.body = payload if payload

            req
          end

          def response_for(request)
            http.request request
          end

          def new_http_client
            if use_proxy?
              url = @proxy.http
              unless proxy.respond_to?(:http) && url
                raise Error::WebDriverError, "expected HTTP proxy, got #{@proxy.inspect}"
              end

              proxy = URI.parse(url)

              clazz = Net::HTTP::Proxy(proxy.host, proxy.port, proxy.user, proxy.password)
              clazz.new(server_url.host, server_url.port)
            else
              Net::HTTP.new server_url.host, server_url.port
            end
          end

          def proxy
            @proxy ||= (
            proxy = ENV['http_proxy'] || ENV['HTTP_PROXY']
            no_proxy = ENV['no_proxy'] || ENV['NO_PROXY']

            if proxy
              proxy = "http://#{proxy}" unless proxy.start_with?('http://')
              Proxy.new(http: proxy, no_proxy: no_proxy)
            end
            )
          end

          def use_proxy?
            return false if proxy.nil?

            if proxy.no_proxy
              ignored = proxy.no_proxy.split(',').any? do |host|
                host == '*' ||
                  host == server_url.host || (
                begin
                  IPAddr.new(host).include?(server_url.host)
                rescue ArgumentError
                  false
                end
                  )
              end

              !ignored
            else
              true
            end
          end
        end # Default
      end # Http
    end # Remote
  end # WebDriver
end # Selenium