require 'time'
require 'json'
require 'howitzer/exceptions'

module Howitzer
  module MailgunApi
    class UnitClient
      attr_reader :url, :options, :block, :body, :code

      def initialize(url, options = {}, _backwards_compatibility = nil, &block)
        @url = url
        @block = block
        @options = options
        @body = nil
        @code = nil
      end

      def [](resource_path, &new_block)
        if block_given? then self.class.new(resource_path, options, &new_block)
        elsif block then self.class.new(resource_path, options, &block)
        else
          self.class.new(resource_path, options)
        end
      end

      def get(_options, _query_string = nil)
        Response.new(response_generator('bounces'))
      rescue StandardError => e
        raise Howitzer::CommunicationError.new(e), e.response
      end

      private

      def response_generator(resource_endpoint)
        case resource_endpoint
        when 'messages'
          t = Time.now
          id = "<#{t.to_i}.#{rand(99_999_999)}.5817@example.com>"
          @body = JSON.generate('message' => 'Queued. Thank you.', 'id' => id)
        when 'bounces'
          @body = JSON.generate(
            'total_count' => 1,
            'items' => {
              'created_at' => 'Fri, 21 Oct 2011 11:02:55 GMT',
              'code' => 550,
              'address' => 'baz@example.com',
              'error' => 'Message was not accepted -- invalid mailbox. Local mailbox baz@example.com is" +
                           " unavailable: user not found'
            }
          )
        when 'lists'
          @body = JSON.generate(
            'member' => {
              'vars' => { 'age' => 26 },
              'name' => 'Foo Bar',
              'subscribed' => false,
              'address' => 'bar@example.com'
            },
            'message' => 'Mailing list member has been updated'
          )
        when 'campaigns'
          @body = JSON.generate('message' => 'Campaign has been deleted', 'id' => 'ABC123')
        end
        self
      end
    end
  end
end