require "json"

require_relative "util"
require_relative "mixin"

module OBSWS
  module Events
    module SUBS
      NONE = 0
      GENERAL = 1 << 0
      CONFIG = 1 << 1
      SCENES = 1 << 2
      INPUTS = 1 << 3
      TRANSITIONS = 1 << 4
      FILTERS = 1 << 5
      OUTPUTS = 1 << 6
      SCENEITEMS = 1 << 7
      MEDIAINPUTS = 1 << 8
      VENDORS = 1 << 9
      UI = 1 << 10

      LOW_VOLUME = GENERAL | CONFIG | SCENES | INPUTS | TRANSITIONS | FILTERS | OUTPUTS |
          SCENEITEMS | MEDIAINPUTS | VENDORS | UI

      INPUTVOLUMEMETERS = 1 << 16
      INPUTACTIVESTATECHANGED = 1 << 17
      INPUTSHOWSTATECHANGED = 1 << 18
      SCENEITEMTRANSFORMCHANGED = 1 << 19

      HIGH_VOLUME = INPUTVOLUMEMETERS | INPUTACTIVESTATECHANGED | INPUTSHOWSTATECHANGED |
          SCENEITEMTRANSFORMCHANGED

      ALL = LOW_VOLUME | HIGH_VOLUME
    end

    module Callbacks
      include Util

      def add_observer(observer)
        @observers = [] unless defined?(@observers)
        observer = [observer] if !observer.respond_to? :each
        observer.each { |o| @observers.append(o) }
      end

      def remove_observer(observer)
        @observers.delete(observer)
      end

      def notify_observers(event, data)
        if defined?(@observers)
          @observers.each do |o|
            if o.respond_to? "on_#{event.to_snake}"
              if data.empty?
                o.send("on_#{event.to_snake}")
              else
                o.send("on_#{event.to_snake}", data)
              end
            end
          end
        end
      end
    end

    class Client
      include Callbacks
      include Mixin::TearDown
      include Mixin::OPCodes

      def initialize(**kwargs)
        kwargs[:subs] ||= SUBS::LOW_VOLUME
        @base_client = Base.new(**kwargs)
        LOGGER.info("#{self} succesfully identified with server")
        @base_client.add_observer(self)
      end

      def to_s
        "#{self.class.name.split("::").last(2).join("::")}"
      end

      def update(op_code, data)
        if op_code == Mixin::OPCodes::EVENT
          event = data[:eventType]
          data = data.key?(:eventData) ? data[:eventData] : {}
          notify_observers(event, Mixin::Data.new(data, data.keys))
        end
      end
    end
  end
end