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# to you under the Apache License, Version 2.0 (the
# "License"); you may not use this file except in compliance
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#
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module Selenium
  module WebDriver
    module Remote
      # @api private
      class Response
        attr_reader :code, :payload
        attr_writer :payload

        def initialize(code, payload = nil)
          @code    = code
          @payload = payload || {}

          assert_ok
        end

        def error
          klass = Error.for_code(status) || return

          ex = klass.new(error_message)
          ex.set_backtrace(caller)
          add_backtrace ex

          ex
        end

        def error_message
          val = value

          case val
          when Hash
            msg = val['message']
            return 'unknown error' unless msg
            msg << ": #{val['alert']['text'].inspect}" if val['alert'].is_a?(Hash) && val['alert']['text']
            msg << " (#{val['class']})" if val['class']
            msg
          when String
            val
          else
            "unknown error, status=#{status}: #{val.inspect}"
          end
        end

        def [](key)
          @payload[key]
        end

        private

        def assert_ok
          e = error
          raise e if e
          return unless @code.nil? || @code >= 400
          raise Error::ServerError, self
        end

        def add_backtrace(ex)
          return unless value.is_a?(Hash) && value['stackTrace']

          server_trace = value['stackTrace']

          backtrace = server_trace.map do |frame|
            next unless frame.is_a?(Hash)

            file = frame['fileName']
            line = frame['lineNumber']
            meth = frame['methodName']

            class_name = frame['className']
            file = "#{class_name}(#{file})" if class_name

            meth = 'unknown' if meth.nil? || meth.empty?

            "[remote server] #{file}:#{line}:in `#{meth}'"
          end.compact

          ex.set_backtrace(backtrace + ex.backtrace)
        end

        def error_payload
          # Even errors are wrapped in 'value' for w3c
          # Grab 'value' key for error, leave original payload alone and let the bridge process
          @error_payload ||= !@payload.key?('sessionId') ? @payload['value'] : @payload
        end

        def status
          return unless error_payload.is_a? Hash
          @status ||= error_payload['status'] || error_payload['error']
        end

        def value
          return unless error_payload.is_a? Hash
          @value ||= error_payload['value'] || error_payload['message']
        end
      end # Response
    end # Remote
  end # WebDriver
end # Selenium