path: root/src/obswebsocket.cr

require "json"
require "pretty_print"
require "http"
require "uuid"

struct Nil
  def as_s?
    self
  end
end

module OBSWebSocket
  extend self
  def req( type : String, id : String, data : ( String | Nil | JSON::Any ) = nil )
    request = JSON.build do |json|
      json.object do
        json.field "op", 6
        json.field "d" do
          json.object do
            json.field "requestType", type
            json.field "requestId", id
            if data
              json.field "requestData", data
            end
          end
        end
      end
    end
    return( request.to_s )
  end

  class SourceMissingException < Exception
  end

  class ResponseDataMissingException < Exception
  end

  class Server
    @@reqchan = Channel( Tuple( ( Channel( JSON::Any ) | Nil ), String ) ).new
    @scenecollection = OBSWebSocket::SceneCollection.new( @@reqchan )
    @@inputs = OBSWebSocket::Inputs.new( @@reqchan )
    @@scenes = OBSWebSocket::SceneList.new( @@reqchan, @@inputs )
    @sources = OBSWebSocket::Sources.new( @@reqchan, @@inputs, @@scenes )
    @outputs = OBSWebSocket::Outputs.new( @@reqchan )
    @video = OBSWebSocket::VideoSettings.new( @@reqchan )
    @stats = OBSWebSocket::Stats.new( @@reqchan )
    @negotiated = false
    @connecterror = 0
    def negotiated?
      return @negotiated
    end
    def reqchan
      return @@reqchan
    end
    def scenecollection
      return @scenecollection
    end
    def scenes
      return @@scenes
    end
    def inputs
      return @@inputs
    end
    def outputs
      return @outputs
    end
    def sources
      return @sources
    end
    def video
      return @video
    end
    def stats
      return @stats
    end
    def transition!
      reschan = Channel( JSON::Any ).new
      @@reqchan.send( { reschan, OBSWebSocket.req( "TriggerStudioModeTransition", UUID.random.to_s ) } )
      return reschan.receive
    end
    # request channel, response channel
    def send( json : String )
      self.reqchan.send( { nil, json } )
    end
    def send( reschan : ( Channel( JSON::Any ) | Nil ), json : String )
      self.reqchan.send( { reschan, json } )
    end
    def request( type : String, id : String, data : ( String | Nil | JSON::Any ) = nil )
      request = JSON.build do |json|
        json.object do
          json.field "op", 6
          json.field "d" do
            json.object do
              json.field "requestType", type
              json.field "requestId", id
              if data
                json.field "requestData", data
              end
            end
          end
        end
      end
      self.reqchan.send( { nil, request.to_s } )
    end
    def request( reschan : ( Channel( JSON::Any ) | Nil ), type : String, id : String, data : ( String | Nil | JSON::Any ) = nil )
      request = JSON.build do |json|
        json.object do
          json.field "op", 6
          json.field "d" do
            json.object do
              json.field "requestType", type
              json.field "requestId", id
              if data
                json.field "requestData", data
              end
            end
          end
        end
      end
      self.reqchan.send( { reschan, request.to_s } )
    end
    def initialize( uri : String, password : String | Nil = nil )
      spawn do
        loop do
          obs_pubsub = HTTP::WebSocket.new( URI.parse( uri ), HTTP::Headers{"Cookie" => "SESSIONID=1235", "Sec-WebSocket-Protocol" => "obswebsocket.json"} )
          openrequests = Hash( String, Channel( JSON::Any ) ).new
          eventsubs = Array( Channel(JSON::Any) ).new
          #metachan = Channel( Tuple( String, Channel( JSON::Any ) ) ).new
          spawn do
            queue = Array( Tuple( Channel( JSON::Any ) | Nil, String ) ).new
            while msgtuple = @@reqchan.receive
              if msgtuple[1] == "clear queue"
                queue.each do | msg |
                  reschan = msg[0]
                  print( "SENT: " )
                  json = JSON.parse(msg[1])
                  pp json
                  if reschan
                    openrequests[ json["d"]["requestId"].as_s ] = reschan
                  end
                  obs_pubsub.send( msg[1] )
                end
              elsif msgtuple[1] == "break"
                break
              elsif msgtuple[1] == "subscribe events"
                reschan = msgtuple[0]
                if reschan
                  eventsubs.push(reschan)
                end
              elsif @negotiated
                reschan = msgtuple[0]
                print "SENT: "
                json = JSON.parse( msgtuple[1] )
                pp json
                if reschan
                  openrequests[ json["d"]["requestId"].as_s ] = reschan
                end
                obs_pubsub.send( msgtuple[1] )
              elsif JSON.parse( msgtuple[1] )["op"].as_i64 == 1
                print "SENT: "
                json = JSON.parse( msgtuple[1] )
                pp json
                obs_pubsub.send( msgtuple[1] )
              else
                print "QUEUED: "
                pp msgtuple[1]
                queue.push( { msgtuple[0], msgtuple[1] } )
              end
            end
          end
          obs_pubsub.on_message do | message |
            json = JSON.parse( message )
            print( "RECEIVED: ")
            print( json.to_pretty_json )
            print( "\n")
            if json["error"]?
              puts json["error"]
              next
            end
            case json["op"].as_i64
            when 0 # hello

              hello = JSON.build do |j|
                j.object do
                  j.field "op", 1
                  j.field "d" do
                    j.object do
                      j.field "rpcVersion", 1
                      j.field "eventSubscriptions", 526335
                      if json["d"]["authentication"]? && password
                        secret = Base64.encode(OpenSSL::Digest.new("sha256").update( password + json["d"]["authentication"]["salt"].as_s    ).final).chomp
                        auth =   Base64.encode(OpenSSL::Digest.new("sha256").update( secret + json["d"]["authentication"]["challenge"].as_s ).final).chomp
                        j.field "authentication", auth
                      end
                    end
                  end
                end
              end

              self.send( hello.to_s )
            when 2 # identified
                @negotiated = true
                @connecterror = 0
                self.reqchan.send( { nil, "clear queue" } )
            when 5 # event
              eventsubs.each do | eventchan |
                eventchan.send( json["d"] )
              end
              # A Fiber.yield occurs immediately after this to make sure "json" doesn't get overwritten before we can use it.
              spawn do
                d = json["d"]
                case d["eventType"].as_s
                when "CurrentPreviewSceneChanged"
                  edata = d["eventData"]
                  @@scenes.previewcache( edata["sceneName"].as_s )
                when "CurrentProgramSceneChanged"
                  edata = d["eventData"]
                  @@scenes.programcache( edata["sceneName"].as_s )
                when "InputCreated"
                  edata = d["eventData"]
                  @@inputs[edata["inputName"].to_s] = OBSWebSocket::Input.new( @@reqchan, edata )
                when "InputNameChanged"
                  edata = d["eventData"]
                  @@inputs.renamecache( edata["oldInputName"].as_s, edata["inputName"].as_s )
                when "InputRemoved"
                  edata = d["eventData"]
                  @@inputs.deletecache( edata["inputName"].as_s )
                when "SceneItemRemoved"
                  edata = d["eventData"]
                  @@scenes[edata["sceneName"].to_s].deletecache( edata["sceneItemId"].as_i64, edata["sourceName"].as_s )
                when "SceneItemEnableStateChanged"
                  edata = d["eventData"]
                  @@scenes[edata["sceneName"].as_s][edata["sceneItemId"].as_i64].enabledcache( edata["sceneItemEnabled"].as_bool )
                when "SceneItemTransformChanged"
                  edata = d["eventData"]
                  transform = edata["sceneItemTransform"]
                  sceneitem = @@scenes[edata["sceneName"].as_s][edata["sceneItemId"].as_i64]
                  sceneitem.transform.cache( transform )
                  if ( transform["sourceHeight"].as_f.to_i64 > 0 ) && ( transform["sourceWidth"].as_f.to_i64 > 0 )
                    sources.last_known_real_transform_add( sceneitem.name, transform )
                  end
                when "SourceDestroyed"
                  # We always dynamically assemble sources from inputs and scenes, so this event is ignored.
                when "SourceFilterEnableStateChanged"
                  edata = json["d"]["eventData"]
                  if ( source = @sources[edata["sourceName"].as_s]? )
                      puts "SourceFilterEnableStateChanged: #{source.class}"
                      source.filters[edata["filterName"].as_s].enabledcache( edata["filterEnabled"].as_bool )
                  else
                    raise SourceMissingException.new( "SourceFilterEnableStateChanged: missing source #{ edata["sourceName"].as_s}" )
                  end
                end
              end
              Fiber.yield
            when 7 # response
              # A Fiber.yield occurs immediately after this to make sure "json" doesn't get overwritten before we can use it.
              spawn do
                d = json["d"]
                if d["requestStatus"]["result"].as_bool == false
                  puts "ERROR: #{d["requestType"].as_s} #{d["requestStatus"]["code"].as_i64}: #{d["requestStatus"]["comment"].as_s}"
                end
                if openrequests[ d["requestId"].as_s ]?
                  channel = openrequests[ d["requestId"].as_s ]
                  channel.send( d )
                  channel.close
                  openrequests.delete( d["requestId"].as_s )
                else
                  puts "PUBSUBREAD THREAD: no response channel known for requestId: #{ d["requestId"].as_s }"
                end
              end
              Fiber.yield
            end
          end
          obs_pubsub.run
        rescue ex : Socket::ConnectError | IO::Error
          if @connecterror < 3
            print ex.message
            @connecterror += 1
            ( @connecterror == 3 ) && ( @connecterror += 1 ) && print ". Suppressing further repeat errors."
            print "\n"
          end
        rescue ex
          pp ex
          pp ex.backtrace?
        ensure
          obs_pubsub && obs_pubsub.close
          @negotiated = false
          @@reqchan.send( { nil, "break" } ) # ask reader fiber to terminate
          # Should we invalidate all the cached ORM data here?
          sleep 10
        end
      end
    end
  end

  class Outputs
    @outputs = Hash( String, OBSWebSocket::Output ).new
    def initialize( @reqchan : Channel( Tuple( Channel( JSON::Any ) | Nil, String ) ) )
    end
    def populate
      reschan = Channel( JSON::Any ).new
      @reqchan.send( { reschan, OBSWebSocket.req( "GetOutputList", UUID.random.to_s ) } )
      d = reschan.receive
      if ( rdata = d["responseData"]? )
        print "OUTPUTS THREAD: "
        pp rdata
        rdata["outputs"].as_a.each do | output |
          @outputs[output["outputName"].as_s] = OBSWebSocket::Output.new( @reqchan, output )
        end
      else
        raise ResponseDataMissingException.new( "#{d["requestType"].as_s} #{d["requestStatus"]["code"].as_i64}: #{d["requestStatus"]["comment"].as_s}" )
      end
    end
    def []( key : String )
      @outputs[key]? || populate
      @outputs[key]
    end
    def to_h
      @outputs.empty? && populate
      @outputs
    end
  end

  class Output
    getter status : OBSWebSocket::OutputStatus
    getter flags : Hash( String, Bool )
    getter state : Hash( String, String | Bool | Int64 | Float64 | Hash( String, Bool ) )
    def initialize( @reqchan : Channel( Tuple( Channel( JSON::Any ) | Nil, String ) ), json : JSON::Any )
      @flags = Hash( String, Bool ).from_json(json["outputFlags"].to_json)
      @status = OBSWebSocket::OutputStatus.new( @reqchan, json["outputName"].as_s )
      @state = Hash(String, String | Bool | Int64 | Float64 | Hash( String, Bool ) ).from_json(json.to_json)
    end
  end

  class OutputStatus
    @age = Int64.new( 0 )
    @status = Hash(String, String | Bool | Int64 | Float64 ).new
    getter name : String
    def initialize( @reqchan : Channel( Tuple( Channel( JSON::Any ) | Nil, String ) ), @name : String )
    end
    def populate
      reschan = Channel( JSON::Any ).new
      @reqchan.send( { reschan, OBSWebSocket.req( "GetOutputStatus", UUID.random.to_s, JSON.parse( { "outputName" => @name }.to_json ) ) } )
      d = reschan.receive
      if ( rdata = d["responseData"]? )
        @age = Time.utc.to_unix
        @status = Hash(String, String | Bool | Int64 | Float64 ).from_json(rdata.to_json)
      else
        raise ResponseDataMissingException.new( "#{d["requestType"].as_s} #{d["requestStatus"]["code"].as_i64}: #{d["requestStatus"]["comment"].as_s}" )
      end
    end
    def []( key : String )
      ( @age < ( Time.utc.to_unix - 10 ) ) && populate
      @status[key]? || populate
      @status[key]
    end
    def to_h : Hash(String, String | Bool | Int64 | Float64 )
      ( @age < ( Time.utc.to_unix - 10 ) ) && populate
      @status.empty? && populate
      @status
    end
  end

  class VideoSettings
    @settings = Hash(String, String | Bool | Int64 | Float64 ).new
    def initialize( @reqchan : Channel( Tuple( Channel( JSON::Any ) | Nil, String ) ) )
    end
    def populate
      reschan = Channel( JSON::Any ).new
      @reqchan.send( { reschan, OBSWebSocket.req( "GetVideoSettings", UUID.random.to_s ) } )
      d = reschan.receive
      if ( rdata = d["responseData"]? )
        @settings = Hash(String, String | Bool | Int64 | Float64 ).from_json(rdata.to_json)
      else
        raise ResponseDataMissingException.new( "#{d["requestType"].as_s} #{d["requestStatus"]["code"].as_i64}: #{d["requestStatus"]["comment"].as_s}" )
      end
    end
    def settings
      @settings.empty? && populate
      @settings
    end
    def []( key : String )
      @settings[key]? || populate
      @settings[key]
    end
    def to_h
      @settings.empty? && populate
      @settings
    end
  end

  class Stats
    @stats = Hash(String, String | Bool | Int64 | Float64 ).new
    @age = Int64.new( 0 )
    def initialize( @reqchan : Channel( Tuple( Channel( JSON::Any ) | Nil, String ) ) )
    end
    def populate
      reschan = Channel( JSON::Any ).new
      @reqchan.send( { reschan, OBSWebSocket.req( "GetStats", UUID.random.to_s ) } )
      d = reschan.receive
      if ( rdata = d["responseData"]? )
        @stats = Hash(String, String | Bool | Int64 | Float64 ).from_json(rdata.to_json)
        @age = Time.utc.to_unix
      else
        raise ResponseDataMissingException.new( "#{d["requestType"].as_s} #{d["requestStatus"]["code"].as_i64}: #{d["requestStatus"]["comment"].as_s}" )
      end
    end
    def []( key : String )
      ( @age < ( Time.utc.to_unix - 10 ) ) && populate
      @stats[key]? || populate
      @stats[key]
    end
    def to_h : Hash(String, String | Bool | Int64 | Float64 )
      @stats.empty? && populate
      @stats
    end
  end

  class SceneCollection # Note: distinct from SceneList
    @current = String.new
    @list = Hash( String, OBSWebSocket::SceneList ).new
    @reqchan = Channel( Tuple( Channel( JSON::Any ) | Nil, String ) ).new
    def initialize( @reqchan : Channel( Tuple( Channel( JSON::Any ) | Nil, String ) ) )
    end
    def populate
      reschan = Channel( JSON::Any ).new
      @reqchan.send( { reschan, OBSWebSocket.req( "GetSceneCollectionList", UUID.random.to_s ) } )
      d = reschan.receive
      if ( rdata = d["responseData"]? )
        @current = rdata["currentSceneCollectionName"].as_s
        rdata["sceneCollections"].as_a.each{ | scenecollection |
          @list[scenecollection.as_s] = OBSWebSocket::SceneList.new( @reqchan )
        }
      else
        raise ResponseDataMissingException.new( "#{d["requestType"].as_s} #{d["requestStatus"]["code"].as_i64}: #{d["requestStatus"]["comment"].as_s}" )
      end
      return true
    end
    def current()
       @current.empty? && populate()
       return @current
    end
    def []( scenelist : String )
      if list[scenelist]?
        return list[scenelist]
      else
        self.populate
      end
    end
  end

  class SceneList # Note: distinct from SceneCollection
    @scenes_by_index = Array(String).new
    @scenes = Hash(String, OBSWebSocket::Scene).new
    @program = String.new
    @preview = String.new
    def initialize( @reqchan : Channel( Tuple( Channel( JSON::Any ) | Nil, String ) ), @inputs : OBSWebSocket::Inputs )
    end
    def populate
      reschan = Channel( JSON::Any ).new
      @reqchan.send( { reschan, OBSWebSocket.req( "GetSceneList", UUID.random.to_s ) } )
      d = reschan.receive
      if ( rdata = d["responseData"]? )
        @program = rdata["currentProgramSceneName"].as_s
        @preview = rdata["currentPreviewSceneName"].as_s
        rdata["scenes"].as_a.each_with_index{ | scene, i |
          name = scene["sceneName"].as_s
          @scenes_by_index.push(name)
          @scenes[name] = OBSWebSocket::Scene.new( @reqchan, name, self )
        }
      else
        raise ResponseDataMissingException.new( "#{d["requestType"].as_s} #{d["requestStatus"]["code"].as_i64}: #{d["requestStatus"]["comment"].as_s}" )
      end
      return true
    end
    def invalidate
      puts "SCENELIST THREAD: scenes invalidated"
      @scenes_by_index = Array(String).new
      @scenes = Hash(String, OBSWebSocket::Scene).new
      @program = String.new
      @preview = String.new
    end
    def programcache( v : String )
      @program = v
    end
    def program
      @program.empty? && populate()
      @scenes[@program]
    end
    def previewcache( v : String )
      @preview = v
    end
    def preview
      @preview.empty? && populate()
      @scenes[@preview]
    end
    def current
      @program.empty? && populate
      @scenes[@program]
    end
    def []( index : Int ) : OBSWebSocket::Scene
      @scenes_by_index[index]? || populate
      @scenes[@scenes_by_index[index]]? || populate
      @scenes[@scenes_by_index[index]]
    end
    def []( index : String ) : OBSWebSocket::Scene
      @scenes[index]? || populate
      @scenes[index]
    end
    def []?( index : String ) : OBSWebSocket::Scene | Nil
      @scenes[index]? || populate
      @scenes[index]?
    end
    def to_h : Hash( String, OBSWebSocket::Scene )
      @scenes.empty? && populate
      return @scenes
    end
  end

  class Scene
    @items_by_id    = Hash( Int64, OBSWebSocket::SceneItem ).new
    @items_by_name  = Hash( String, Int64 ).new
    @items_by_index = Array( Int64 ).new
    @subscenes      = Array( OBSWebSocket::Scene ).new
    getter filters  : OBSWebSocket::SourceFilters
    getter name     : String
    getter parent   : OBSWebSocket::SceneList # needed for reverse metasceneitem lookup
    @age            = Int64.new( 0 )
    def initialize( @reqchan : Channel( Tuple( Channel( JSON::Any ) | Nil, String ) ), @name : String, @parent : OBSWebSocket::SceneList )
      @filters  = OBSWebSocket::SourceFilters.new( @reqchan, @name )
    end
    def populate
      reschan = Channel( JSON::Any ).new
      @reqchan.send( { reschan, OBSWebSocket.req( "GetSceneItemList", UUID.random.to_s, JSON.parse( { "sceneName" => @name }.to_json ) ) } )
      d = reschan.receive
      if ( rdata = d["responseData"]? )
        # handle "sourceType": "OBS_SOURCE_TYPE_SCENE"
        rdata["sceneItems"].as_a.each_with_index{ | item, i |
          sname = item["sourceName"].as_s
          siid   = item["sceneItemId"].as_i64
          @items_by_id[siid] = OBSWebSocket::SceneItem.new( @reqchan, @name, item )
          @items_by_index.push( siid )
          @items_by_name[sname] = siid
          if item["sourceType"].as_s == "OBS_SOURCE_TYPE_SCENE"
            @subscenes.push( @parent[sname] )
          end
        }
      @age = Time.utc.to_unix
      else
        raise ResponseDataMissingException.new( "#{d["requestType"].as_s} #{d["requestStatus"]["code"].as_i64}: #{d["requestStatus"]["comment"].as_s}" )
      end
      return true
    end
    # Sources may be present a scene via other scenes.
    # We can still look these up by source name.
    # Note: OBS refuses to create a referential loop
    def metascene : Hash( String, Array( OBSWebSocket::SceneItem ) )
      @subscenes.empty? && populate
      metascene = Hash( String, Array( OBSWebSocket::SceneItem ) ).new
      newsubscenes = @subscenes
      while ( subscene = newsubscenes.shift? )
        subscene.to_h.each do | siname, sceneitem |
          if sceneitem.type == "OBS_SOURCE_TYPE_SCENE"
            newsubscenes.push( parent[siname] )
          end
          metascene[ siname ]? || ( metascene[ siname ] = Array( OBSWebSocket::SceneItem ).new )
          metascene[ siname ].push( sceneitem )
        end
      end
      @items_by_id.values.each do | sitem |
        metascene[ sitem.name ]? || ( metascene[ sitem.name ] = Array( OBSWebSocket::SceneItem ).new )
        metascene[ sitem.name ].push( sitem )
      end
      return metascene
    end
    # less requests generated with this method
    # but Nil union is more annoying
    # FIXME: See metascene()
    def metasceneitem?( name : String ) : OBSWebSocket::SceneItem | Nil
      result = nil
      if self[name]?
        result = self[name]
      else
        @subscenes.each do | scene |
          if scene[name]?
            result = scene[name]
            break
          end
        end
      end
      return result
    end
    def []?( name : String ) : OBSWebSocket::SceneItem | Nil
      ( @items_by_name[name]? || ( @age > 0 ) ) || populate
      if @items_by_name[name]?
        ( @items_by_id[ @items_by_name[name] ]? || ( @age > 0 ) ) || populate
        return @items_by_id[ @items_by_name[name] ]
      else
        return nil
      end
    end
    def []( name : String ) : OBSWebSocket::SceneItem
      @items_by_name[name]? || populate
      @items_by_id[ @items_by_name[name] ]? || populate
      return @items_by_id[ @items_by_name[name] ]
    end
    def []( id : Int64 ) : OBSWebSocket::SceneItem
      @items_by_id[id]? || populate
      return @items_by_id[id]
    end
    def by_index( index : Int64 )
      @items_by_index[index]? || populate
      @items_by_id[ @items_by_index[index] ]? || populate
      return @items_by_id[ @items_by_index[index] ]
    end
    def to_h : Hash( String, OBSWebSocket::SceneItem )
      @items_by_id.empty? && populate
      hash = Hash( String, OBSWebSocket::SceneItem ).new
      @items_by_name.each do | key, value |
        hash[key] = @items_by_id[value]
      end
      return hash
    end
    def current!
      program!
    end
    def program!
      reschan = Channel( JSON::Any ).new
      @reqchan.send( { reschan, OBSWebSocket.req( "SetCurrentProgramScene", UUID.random.to_s, JSON.parse( { "sceneName" => @name }.to_json ) ) } )
      reschan.receive # we get weird behavior on transitions unless we block here
    end
    def preview!
      reschan = Channel( JSON::Any ).new
      @reqchan.send( { reschan, OBSWebSocket.req( "SetCurrentPreviewScene", UUID.random.to_s, JSON.parse( { "sceneName" => @name }.to_json ) ) } )
      reschan.receive # we get weird behavior on transitions unless we block here
    end
    def createinput( iname : String, kind : String, settings : OBSWebSocket::InputSettings | Hash( String, String | Bool | Int64 | Float64 ) | Nil = nil, enabled : Bool = true )
      reqdata = ( Hash( String, String | Bool | Int64 | Float64 | Hash( String, String | Bool | Int64 | Float64 ) ) ).new
      reqdata["sceneName"] = @name
      reqdata["inputName"] = iname
      reqdata["inputKind"] = kind
      if settings
        reqdata["inputSettings"] = settings.to_h
      end
      unless enabled
        reqdata["sceneItemEnabled"] = false
      end

      reschan = Channel( JSON::Any ).new
      @reqchan.send( { reschan, OBSWebSocket.req( "CreateInput", UUID.random.to_s, JSON.parse(reqdata.to_json) ) } )
      d = reschan.receive
      # maybe block until the event comes in?
      # will have to depend on the EventSubscription state
      if d["requestStatus"]["result"].as_bool # success?
        # "responseData": { "sceneItemId": 219 }
        # Is this ever useful? It's a lot more requests than to just redo the entire GetSceneItemList
        #siid = d["responseData"]["sceneItemId"].as_i64
        parent.@inputs.deletecache
        self.deletecache
      end
      return d

    end
    def deletecache( )

      @items_by_id    = Hash( Int64, OBSWebSocket::SceneItem ).new
      @items_by_name  = Hash( String, Int64 ).new
      @items_by_index = Array( Int64 ).new
      @subscenes      = Array( OBSWebSocket::Scene ).new
    end
    def deletecache( siid : Int64, siname : String )
      @items_by_id.delete( siid )
      @items_by_name.delete( siname )
      @items_by_index.delete( siid )
    end
  end

  class SceneItem
    getter id        : Int64
    getter name      : String
    getter kind      : ( String | Nil )
    getter type      : String
    getter scenename : String
    getter enabled   : Bool
    getter blendmode : ( String | Nil )
    getter locked    : Bool
    getter transform : OBSWebSocket::SceneItemTransform
    def initialize( @reqchan : Channel( Tuple( Channel( JSON::Any ) | Nil, String ) ), @scenename : String, json : JSON::Any )
      @id      = json["sceneItemId"].as_i64
      @name    = json["sourceName"].as_s
      @kind    = json["inputKind"]?.as_s?
      @type    = json["sourceType"].as_s
      @locked  = json["sceneItemLocked"].as_bool
      @enabled = json["sceneItemEnabled"].as_bool
      @blendmode = json["sceneItemBlendmode"]?.as_s?
      @transform = OBSWebSocket::SceneItemTransform.new( @reqchan, json["sceneItemTransform"], @name, @id )
    end
    def enabledcache( v : Bool )
      @enabled = v
    end
    def enabled
      @enabled
    end
    def toggle!
      if @enabled
        disable!
      else
        enable!
      end
    end
    def enable!
      @reqchan.send( { nil, OBSWebSocket.req( "SetSceneItemEnabled", UUID.random.to_s, JSON.parse( { "sceneName" => @scenename, "sceneItemId" => @id, "sceneItemEnabled" => true }.to_json ) ) } )
    end
    def disable!
      @reqchan.send( { nil, OBSWebSocket.req( "SetSceneItemEnabled", UUID.random.to_s, JSON.parse( { "sceneName" => @scenename, "sceneItemId" => @id, "sceneItemEnabled" => false }.to_json ) ) } )
    end
    def transform( newtransform : OBSWebSocket::SceneItemTransform | Hash( String, String | Bool | Int64 | Float64 ) )
      reqdata = ( Hash( String, String | Bool | Int64 | Float64 | Hash( String, String | Bool | Int64 | Float64 ) ) ).new
      reqdata["sceneItemId"] = @id.to_i64
      reqdata["sceneName"] = @scenename
      reqdata["sceneItemTransform"] = Hash( String, String | Bool | Int64 | Float64).new.merge( newtransform.to_h )
      reschan = Channel( JSON::Any ).new
      @reqchan.send( { reschan, OBSWebSocket.req( "SetSceneItemTransform", UUID.random.to_s, JSON.parse(reqdata.to_json) ) } )
      d = reschan.receive
    end
  end

  class SceneItemTransform
    @sceneitemtransform = Hash(String, String | Bool | Int64 | Float64 ).new
    def initialize( @reqchan : Channel( Tuple( Channel( JSON::Any ) | Nil, String ) ), json : JSON::Any, @sceneitemname : String, @sceneitemid : Int64 )
      @sceneitemtransform = Hash(String, String | Bool | Int64 | Float64 ).from_json(json.to_json)
    end
    def populate
      reschan = Channel( JSON::Any ).new
      @reqchan.send( { reschan, OBSWebSocket.req( "GetSceneItemTransform", UUID.random.to_s, JSON.parse( { "sceneName" => @sceneitemname, "sceneItemId" => @sceneitemid }.to_json ) ) } )
      d = reschan.receive
      if ( rdata = d["responseData"]? )
        @sceneitemtransform = Hash(String, String | Bool | Int64 | Float64 ).from_json(rdata["sceneItemTransform"].to_json)
      else
        raise ResponseDataMissingException.new( "#{d["requestType"].as_s} #{d["requestStatus"]["code"].as_i64}: #{d["requestStatus"]["comment"].as_s}" )
      end
    end
    def []( key : String )
      @sceneitemtransform[key]? || populate
      @sceneitemtransform[key]
    end
    def to_h
      @sceneitemtransform.empty? && populate
      @sceneitemtransform
    end
    def cache( newtransform = JSON::Any | Hash(String, String | Bool | Int64 | Float64 ) )
        @sceneitemtransform = Hash(String, String | Bool | Int64 | Float64 ).from_json(newtransform.to_json)
    end
  end

  class Sources
    getter scenes : OBSWebSocket::SceneList
    getter inputs : OBSWebSocket::Inputs
    @last_known_real_transform = Hash( String, OBSWebSocket::SceneItemTransform ).new
    def initialize( @reqchan : Channel( Tuple( Channel( JSON::Any ) | Nil, String ) ), @inputs : OBSWebSocket::Inputs, @scenes : OBSWebSocket::SceneList )
    end
    def []?( index : String ) : OBSWebSocket::Scene | OBSWebSocket::Input | Nil
      if @inputs[index]?
        return @inputs[index]
      elsif @scenes[index]?
        return @scenes[index]
      else
        return nil
      end
    end
    def to_h() : Hash( String, OBSWebSocket::Scene | OBSWebSocket::Input )
      return @inputs.to_h.merge( @scenes.to_h )
    end
    def last_known_real_transform_add( sourcename : String, transform : JSON::Any )
      @last_known_real_transform[ sourcename ] = OBSWebSocket::SceneItemTransform.new( @reqchan, transform, sourcename, 0.to_i64 )
    end
    def last_known_real_transform( sourcename : String ) : OBSWebSocket::SceneItemTransform
      @last_known_real_transform[ sourcename ]
    end
    def last_known_real_transform?( sourcename : String ) : OBSWebSocket::SceneItemTransform | Nil
      @last_known_real_transform[ sourcename ]?
    end
  end

  class Inputs
    @inputs = Hash( String, OBSWebSocket::Input ).new
    def initialize( @reqchan : Channel( Tuple( Channel( JSON::Any ) | Nil, String ) ) )
    end
    def populate
      reschan = Channel( JSON::Any ).new
      @reqchan.send( { reschan, OBSWebSocket.req( "GetInputList", UUID.random.to_s) } )
      d = reschan.receive
      if ( rdata = d["responseData"]? )
        rdata["inputs"].as_a.each{ | input |
          @inputs[input["inputName"].as_s] = OBSWebSocket::Input.new( @reqchan, input )
        }
      else
        raise ResponseDataMissingException.new( "#{d["requestType"].as_s} #{d["requestStatus"]["code"].as_i64}: #{d["requestStatus"]["comment"].as_s}" )
      end
    end
    def []?( index : String ) : OBSWebSocket::Input | Nil
      @inputs[index]? || populate
      return @inputs[index]?
    end
    def []( index : String )
      @inputs[index]? || populate
      return @inputs[index]
    end
    def []=( index : String, input = OBSWebSocket::Input )
      @inputs[index] = input
    end
    def to_h : Hash( String, OBSWebSocket::Input )
      @inputs.empty? && populate
      return @inputs
    end
    def renamecache( old : String, new : String )
      @inputs[new] = @inputs[old]
      @inputs.delete( old )
      @inputs[new].namecache( new )
    end
    def deletecache()
      @inputs = Hash( String, OBSWebSocket::Input ).new
    end
    def deletecache( input : String )
      @inputs.delete( input )
    end
  end

  class Input
    getter kind : String
    getter name : String
    getter settings : OBSWebSocket::InputSettings
    getter filters  : OBSWebSocket::SourceFilters
    def initialize( @reqchan : Channel( Tuple( Channel( JSON::Any ) | Nil, String ) ), json : JSON::Any )
      @kind = json["inputKind"].as_s
      @name = json["inputName"].as_s
      @settings = OBSWebSocket::InputSettings.new( @reqchan, @name )
      @filters  = OBSWebSocket::SourceFilters.new( @reqchan, @name )
    end
    def delete!( )
      reschan = Channel( JSON::Any ).new
      @reqchan.send( { reschan, OBSWebSocket.req( "RemoveInput", UUID.random.to_s, JSON.parse({ "inputName" => @name }.to_json) ) } )
      d = reschan.receive
    end
    def namecache( name : String )
      @name = name
      @settings.namecache( name )

      @filters.to_h.values.each do | value |
        value.sourcenamecache( name )
      end
    end
  end

  class InputSettings
    @inputsettings = Hash(String, String | Bool | Int64 | Float64 ).new
    @inputkind = String.new
    getter name : String
    def initialize( @reqchan : Channel( Tuple( Channel( JSON::Any ) | Nil, String ) ), @name : String )
    end
    def initialize( @reqchan : Channel( Tuple( Channel( JSON::Any ) | Nil, String ) ), @name : String, @inputkind : String, @inputsettings : Hash( String, String | Bool | Int64 | Float64 ) )
    end
    def populate
      reschan = Channel( JSON::Any ).new
      @reqchan.send( { reschan, OBSWebSocket.req( "GetInputSettings", UUID.random.to_s, JSON.parse( { "inputName" => @name }.to_json ) ) } )
      d = reschan.receive
      if ( rdata = d["responseData"]? )
        @inputsettings = Hash(String, String | Bool | Int64 | Float64 ).from_json(rdata["inputSettings"].to_json)
        @inputkind = rdata["inputKind"].as_s
      else
        raise ResponseDataMissingException.new( "#{d["requestType"].as_s} #{d["requestStatus"]["code"].as_i64}: #{d["requestStatus"]["comment"].as_s}" )
      end
    end
    def kind
      @inputkind.empty? && populate
      @inputkind
    end
    def []( key : String )
      @inputsettings[key]? || populate
      @inputsettings[key]
    end
    def to_h
      @inputsettings.empty? && populate
      @inputsettings
    end
    def namecache( name : String)
      @name = name
    end
  end

  class SourceFilters # Note: a property of both OBSWebSocket::Input and OBSWebSocket::Scene
    @filters_by_name = Hash( String, OBSWebSocket::SourceFilter ).new
    @filters_by_index = Array( String ).new
    getter sourcename : String
    def initialize( @reqchan : Channel( Tuple( Channel( JSON::Any ) | Nil, String ) ), @sourcename : String )
    end
    def populate
      reschan = Channel( JSON::Any ).new
      @reqchan.send( { reschan, OBSWebSocket.req( "GetSourceFilterList", UUID.random.to_s, JSON.parse( { "sourceName" => @sourcename }.to_json ) ) } )
      d = reschan.receive
      if ( rdata = d["responseData"]? )
        rdata["filters"].as_a.each do | filter |
          name = filter["filterName"].as_s
          @filters_by_index.push( name )
          @filters_by_name[name] = OBSWebSocket::SourceFilter.new( @reqchan, @sourcename, filter )
        end
      else
        raise ResponseDataMissingException.new( "#{d["requestType"].as_s} #{d["requestStatus"]["code"].as_i64}: #{d["requestStatus"]["comment"].as_s}" )
      end
    end
    def []( index : Int64 )
      @filters_by_index[index]? || populate
      @filters_by_name[@filters_by_index[index]]? || populate
      @filters_by_name[@filters_by_index[index]]
    end
    def []?( key : String ) : OBSWebSocket::SourceFilter | Nil
      @filters_by_name[key]? || populate
      @filters_by_name[key]?
    end
    def []( key : String )
      @filters_by_name[key]? || populate
      @filters_by_name[key]
    end
    def to_h
      @filters_by_name.empty? && populate
      @filters_by_name
    end
  end

  class SourceFilter
    getter name       : String
    getter kind       : String
    getter enabled    : Bool
    getter settings   : OBSWebSocket::SourceFilterSettings
    getter sourcename : String
    def initialize( @reqchan : Channel( Tuple( Channel( JSON::Any ) | Nil, String ) ), @sourcename, json : JSON::Any )
      @kind = json["filterKind"].as_s
      @name = json["filterName"].as_s
      @enabled = json["filterEnabled"].as_bool
      @settings = OBSWebSocket::SourceFilterSettings.new( @reqchan, @name, json["filterSettings"] )
    end
    def toggle!
      if @enabled
        disable!
      else
        enable!
      end
    end
    def enable!
      reschan = Channel( JSON::Any ).new
      @reqchan.send( { reschan, OBSWebSocket.req( "SetSourceFilterEnabled", UUID.random.to_s, JSON.parse( { "sourceName" => @sourcename, "filterName" => @name, "filterEnabled" => true }.to_json ) ) } )
      d = reschan.receive
      return d["requestStatus"]["result"].as_bool
    end
    def disable!
      reschan = Channel( JSON::Any ).new
      @reqchan.send( { reschan, OBSWebSocket.req( "SetSourceFilterEnabled", UUID.random.to_s, JSON.parse( { "sourceName" => @sourcename, "filterName" => @name, "filterEnabled" => false }.to_json ) ) } )
      d = reschan.receive
      return d["requestStatus"]["result"].as_bool
    end
    def enabledcache( bool : Bool )
      @enabled = bool
    end
    def sourcenamecache( name : String )
      @sourcename = name
    end
  end

  class SourceFilterSettings
    getter settings : Hash(String, String | Bool | Int64 | Float64 )
    getter sourcename : String
    def initialize( @reqchan : Channel( Tuple( Channel( JSON::Any ) | Nil, String ) ), @sourcename, json : JSON::Any )
      @settings = Hash(String, String | Bool | Int64 | Float64 ).from_json(json.to_json)
    end
    # do we need to populate() this somehow?
    # SetSourceFilterSettings is available, but
    # GetSourceFilterSettings is not. Must use
    # GetSourceFilters instead.
    def []( key : String )
      @settings[key]
    end
    def to_h
      @settings
    end

  end
end