magic.cr

require "json"

abstract class Plugin
  ALL = {} of String => Plugin.class

  macro inherited
    ALL[{{@type.name}}] = {{@type.name.id}}
  end
end

class PluginOne < Plugin
  json_mapping({one: String})

  def self.magic(pull)
    new(pull)
  end
end

class PluginTwo < Plugin
  json_mapping({two: String})

  def self.magic(pull)
    new(pull)
  end
end

class Plugins
  def self.new(pull : JSON::PullParser)
    plugins = [] of Plugin
    pull.read_object do |key|
      plugin_class = Plugin::ALL[key]
      plugins << plugin_class.magic(pull)
    end
    plugins
  end
end

class Config
  json_mapping({plugins: Plugins})
end

json = %(
  {
    "plugins": {
      "PluginOne": {
        "one": "HOLA"
      },
      "PluginTwo": {
        "two": "CHAU"
      }
    }
  }
)

config = Config.from_json(json)
pp config