module JamRuby
  # creates messages (implementation: protocol buffer) objects cleanly
  class MessageFactory

    CLIENT_TARGET         = "client"
    SERVER_TARGET         = "server"
    SESSION_TARGET_PREFIX = "session:"
    USER_TARGET_PREFIX    = "user:"
    CLIENT_TARGET_PREFIX  = "client:"

    def initialize()
      @type_values = {}

      Jampb::ClientMessage::Type.constants.each do |constant|
        @type_values[Jampb::ClientMessage::Type.const_get(constant)] = constant
      end

    end

    # given a string (bytes) payload, return a client message
    def parse_client_msg(payload)
      return Jampb::ClientMessage.parse(payload)
    end

    # create a login message using user/pass
    def login_with_user_pass(username, password, options = {})
      login = Jampb::Login.new(
        :username => username,
        :password => password,
        :client_id => options[:client_id]
      )

      return Jampb::ClientMessage.new(
        :type => ClientMessage::Type::LOGIN,
        :route_to => SERVER_TARGET,
        :login => login
      )
    end

    # create a login message using token (a cookie or similar)
    def login_with_token(token, options = {})
      login = Jampb::Login.new(
        :token => token,
        :client_id => options[:client_id]
      )

      return Jampb::ClientMessage.new(
        :type => ClientMessage::Type::LOGIN,
        :route_to => SERVER_TARGET,
        :login => login
      )
    end

    # create a login ack (login was successful)
    def login_ack(public_ip, client_id, token, heartbeat_interval, music_session_id, reconnected, user_id)
      login_ack = Jampb::LoginAck.new(
        :public_ip => public_ip,
        :client_id => client_id,
        :token => token,
        :heartbeat_interval => heartbeat_interval,
        :music_session_id => music_session_id,
        :reconnected => reconnected,
        :user_id => user_id
      )

      return Jampb::ClientMessage.new(
        :type => ClientMessage::Type::LOGIN_ACK,
        :route_to => CLIENT_TARGET,
        :login_ack => login_ack
      )
    end

    def download_available
      download_available = Jampb::DownloadAvailable.new

      return Jampb::ClientMessage.new(
          :type => ClientMessage::Type::DOWNLOAD_AVAILABLE,
          :route_to => CLIENT_TARGET,
          :download_available => download_available
      )
    end

    # create a music session login message
    def login_music_session(music_session)
      login_music_session = Jampb::LoginMusicSession.new(:music_session => music_session)

      return Jampb::ClientMessage.new(
        :type => ClientMessage::Type::LOGIN_MUSIC_SESSION,
        :route_to => SERVER_TARGET,
        :login_music_session => login_music_session
      )
    end

    # create a music session login message ack (success or on failure)
    def login_music_session_ack(error, error_reason)
      login_music_session_ack = Jampb::LoginMusicSessionAck.new(:error => error, :error_reason => error_reason)

      return Jampb::ClientMessage.new(
        :type => ClientMessage::Type::LOGIN_MUSIC_SESSION_ACK,
        :route_to => CLIENT_TARGET,
        :login_music_session_ack => login_music_session_ack
      )
    end

    # create a music session 'leave session' message
    def leave_music_session(music_session)
      leave_music_session = Jampb::LeaveMusicSession.new(:music_session => music_session)

      return Jampb::ClientMessage.new(
        :type => ClientMessage::Type::LEAVE_MUSIC_SESSION,
        :route_to => SERVER_TARGET,
        :leave_music_session => leave_music_session
      )
    end

    # create a music session leave message ack (success or on failure)
    def leave_music_session_ack(error, error_reason)
      leave_music_session_ack = Jampb::LeaveMusicSessionAck.new(:error => error, :error_reason => error_reason)

      return Jampb::ClientMessage.new(
        :type => ClientMessage::Type::LEAVE_MUSIC_SESSION_ACK,
        :route_to => CLIENT_TARGET,
        :leave_music_session_ack => leave_music_session_ack
      )
    end

    # create a heartbeat
    def heartbeat()
      heartbeat = Jampb::Heartbeat.new

      return Jampb::ClientMessage.new(
        :type => ClientMessage::Type::HEARTBEAT,
        :route_to => SERVER_TARGET,
        :heartbeat => heartbeat
      )
    end

    # create a heartbeat ack
    def heartbeat_ack()
      heartbeat_ack = Jampb::HeartbeatAck.new

      return Jampb::ClientMessage.new(
        :type => ClientMessage::Type::HEARTBEAT_ACK,
        :route_to => CLIENT_TARGET,
        :heartbeat_ack => heartbeat_ack
      )
    end

    # create a server bad state recovered msg
    def server_bad_state_recovered(original_message_id)
      recovered = Jampb::ServerBadStateRecovered.new()

      return Jampb::ClientMessage.new(
        :type => ClientMessage::Type::SERVER_BAD_STATE_RECOVERED,
        :route_to => CLIENT_TARGET,
        :server_bad_state_recovered => recovered,
        :in_reply_to => original_message_id
      )
    end

    # create a server error
    def server_generic_error(error_msg)
      error = Jampb::ServerGenericError.new(:error_msg => error_msg)

      return Jampb::ClientMessage.new(
        :type => ClientMessage::Type::SERVER_GENERIC_ERROR,
        :route_to => CLIENT_TARGET,
        :server_generic_error => error
      )
    end

    # create a server rejection error
    def server_rejection_error(error_msg)
      error = Jampb::ServerRejectionError.new(:error_msg => error_msg)

      return Jampb::ClientMessage.new(
        :type => ClientMessage::Type::SERVER_REJECTION_ERROR,
        :route_to => CLIENT_TARGET,
        :server_rejection_error => error
      )
    end

    # create a server rejection error
    def server_permission_error(original_message_id, error_msg)
      error = Jampb::ServerPermissionError.new(:error_msg => error_msg)

      return Jampb::ClientMessage.new(
        :type => ClientMessage::Type::SERVER_PERMISSION_ERROR,
        :route_to => CLIENT_TARGET,
        :server_permission_error => error,
        :in_reply_to => original_message_id
      )
    end

    # create a server bad state error
    def server_bad_state_error(original_message_id, error_msg)
      error = Jampb::ServerBadStateError.new(:error_msg => error_msg)

      return Jampb::ClientMessage.new(
        :type => ClientMessage::Type::SERVER_BAD_STATE_ERROR,
        :route_to => CLIENT_TARGET,
        :server_bad_state_error => error,
        :in_reply_to => original_message_id
      )
    end

    ###################################### NOTIFICATIONS ######################################

    # create a friend update message
    def friend_update(user_id, photo_url, online, msg)
      friend = Jampb::FriendUpdate.new(
        :user_id => user_id,
        :photo_url => photo_url,
        :online => online,
        :msg => msg
      )

      return Jampb::ClientMessage.new(
        :type => ClientMessage::Type::FRIEND_UPDATE,
        :route_to => USER_TARGET_PREFIX + user_id,
        :friend_update => friend
      )
    end

    # create a friend request message
    def friend_request(receiver_id, friend_request_id, photo_url, msg, notification_id, created_at)
      friend_request = Jampb::FriendRequest.new(
        :friend_request_id => friend_request_id, 
        :photo_url => photo_url,
        :msg => msg, 
        :notification_id => notification_id,
        :created_at => created_at
      )

      return Jampb::ClientMessage.new(
        :type => ClientMessage::Type::FRIEND_REQUEST,
        :route_to => USER_TARGET_PREFIX + receiver_id,
        :friend_request => friend_request
      )
    end

    # create a friend request acceptance message
    def friend_request_accepted(receiver_id, photo_url, msg, notification_id, created_at)
      friend_request_accepted = Jampb::FriendRequestAccepted.new(
        :photo_url => photo_url,
        :msg => msg, 
        :notification_id => notification_id,
        :created_at => created_at
      )

      return Jampb::ClientMessage.new(
        :type => ClientMessage::Type::FRIEND_REQUEST_ACCEPTED,
        :route_to => USER_TARGET_PREFIX + receiver_id,
        :friend_request_accepted => friend_request_accepted
      )
    end

    def new_user_follower(receiver_id, photo_url, msg, notification_id, created_at)
      new_user_follower = Jampb::NewUserFollower.new( 
        :photo_url => photo_url,
        :msg => msg, 
        :notification_id => notification_id,
        :created_at => created_at
      )

      return Jampb::ClientMessage.new(
        :type => ClientMessage::Type::NEW_USER_FOLLOWER,
        :route_to => USER_TARGET_PREFIX + receiver_id,
        :new_user_follower => new_user_follower
      )
    end

    def new_band_follower(receiver_id, photo_url, msg, notification_id, created_at)
      new_band_follower = Jampb::NewBandFollower.new(
        :photo_url => photo_url,
        :msg => msg, 
        :notification_id => notification_id,
        :created_at => created_at
      )

      return Jampb::ClientMessage.new(
        :type => ClientMessage::Type::NEW_BAND_FOLLOWER,
        :route_to => USER_TARGET_PREFIX + receiver_id,
        :new_band_follower => new_band_follower
      )
    end

    def session_invitation(receiver_id, session_id, msg, notification_id, created_at)
      session_invitation = Jampb::SessionInvitation.new(
        :session_id => session_id,
        :msg => msg,        
        :notification_id => notification_id,
        :created_at => created_at
      )

      return Jampb::ClientMessage.new(
        :type => ClientMessage::Type::SESSION_INVITATION,
        :route_to => USER_TARGET_PREFIX + receiver_id,
        :session_invitation => session_invitation
      )
    end

    # create a join request session message
    def join_request(join_request_id, session_id, photo_url, msg, notification_id, created_at)
      req = Jampb::JoinRequest.new(
        :join_request_id => join_request_id,
        :session_id => session_id,
        :photo_url => photo_url,
        :msg => msg,
        :notification_id => notification_id,
        :created_at => created_at
      )

      return Jampb::ClientMessage.new(
        :type => ClientMessage::Type::JOIN_REQUEST,
        :route_to => SESSION_TARGET_PREFIX + session_id,
        :join_request => req
      )
    end

    # create a join request approved session message
    def join_request_approved(join_request_id, session_id, photo_url, msg, notification_id, created_at)
      req_approved = Jampb::JoinRequestApproved.new(
        :join_request_id => join_request_id,
        :session_id => session_id,
        :photo_url => photo_url,
        :msg => msg,
        :notification_id => notification_id,
        :created_at => created_at
      )

      return Jampb::ClientMessage.new(
        :type => ClientMessage::Type::JOIN_REQUEST_APPROVED,
        :route_to => SESSION_TARGET_PREFIX + session_id,
        :join_request_approved => req_approved
      )
    end

    # create a join request rejected session message
    def join_request_rejected(join_request_id, session_id, photo_url, msg, notification_id, created_at)
      req_rejected = Jampb::JoinRequestRejected.new(
        :join_request_id => join_request_id,
        :session_id => session_id,
        :photo_url => photo_url,
        :msg => msg,
        :notification_id => notification_id,
        :created_at => created_at
      )

      return Jampb::ClientMessage.new(
        :type => ClientMessage::Type::JOIN_REQUEST_REJECTED,
        :route_to => SESSION_TARGET_PREFIX + session_id,
        :join_request_rejected => req_rejected
      )
    end

    def session_join(session_id, photo_url, msg)
      join = Jampb::SessionJoin.new(
        :session_id => session_id,
        :photo_url => photo_url,
        :msg => msg
      )

      return Jampb::ClientMessage.new(
        :type => ClientMessage::Type::SESSION_JOIN,
        :route_to => CLIENT_TARGET,
        :session_join => join
      )
    end

    def session_depart(session_id, photo_url, msg, recording_id = nil)
      left = Jampb::SessionDepart.new(
        :session_id => session_id,
        :photo_url => photo_url,
        :msg => msg,
        :recording_id => recording_id
      )

      return Jampb::ClientMessage.new(
        :type => ClientMessage::Type::SESSION_DEPART,
        :route_to => CLIENT_TARGET,
        :session_depart => left
      )
    end

    def musician_session_join(receiver_id, session_id, photo_url, msg, notification_id, created_at)
      musician_session_join = Jampb::MusicianSessionJoin.new(
        :session_id => session_id,
        :photo_url => photo_url,
        :msg => msg,
        :notification_id => notification_id,
        :created_at => created_at
      )

      return Jampb::ClientMessage.new(
        :type => ClientMessage::Type::MUSICIAN_SESSION_JOIN,
        :route_to => USER_TARGET_PREFIX + receiver_id,
        :musician_session_join => musician_session_join
      )
    end

    def band_session_join(receiver_id, session_id, photo_url, msg, notification_id, created_at)
      band_session_join = Jampb::BandSessionJoin.new(
          :session_id => session_id,
          :photo_url => photo_url,
          :msg => msg,
          :notification_id => notification_id,
          :created_at => created_at
        )

      return Jampb::ClientMessage.new(
        :type => ClientMessage::Type::BAND_SESSION_JOIN,
        :route_to => USER_TARGET_PREFIX + receiver_id,
        :band_session_join => band_session_join
      )
    end

    def musician_recording_saved(receiver_id, recording_id, photo_url, msg, notification_id, created_at)
      musician_recording_saved = Jampb::MusicianRecordingSaved.new(
        :recording_id => recording_id,
        :photo_url => photo_url,
        :msg => msg,
        :notification_id => notification_id,
        :created_at => created_at
      )

      return Jampb::ClientMessage.new(
        :type => ClientMessage::Type::MUSICIAN_RECORDING_SAVED,
        :route_to => USER_TARGET_PREFIX + receiver_id,
        :musician_recording_saved => musician_recording_saved
      )
    end

    def band_recording_saved(receiver_id, recording_id, photo_url, msg, notification_id, created_at)
      band_recording_saved = Jampb::BandRecordingSaved.new(
        :recording_id => recording_id,
        :photo_url => photo_url,
        :msg => msg,
        :notification_id => notification_id,
        :created_at => created_at
      )

      return Jampb::ClientMessage.new(
        :type => ClientMessage::Type::BAND_RECORDING_SAVED,
        :route_to => USER_TARGET_PREFIX + receiver_id,
        :band_recording_saved => band_recording_saved
      )
    end

    def recording_started(receiver_id, photo_url, msg)
      recording_started = Jampb::RecordingStarted.new(
        :photo_url => photo_url,
        :msg => msg
      )

      return Jampb::ClientMessage.new(
        :type => ClientMessage::Type::RECORDING_STARTED,
        :route_to => USER_TARGET_PREFIX + receiver_id,
        :recording_started => recording_started
      )
    end

    def recording_ended(receiver_id, photo_url, msg)
      recording_ended = Jampb::RecordingEnded.new(
        :photo_url => photo_url,
        :msg => msg
      )

      return Jampb::ClientMessage.new(
        :type => ClientMessage::Type::RECORDING_ENDED,
        :route_to => USER_TARGET_PREFIX + receiver_id,
        :recording_ended => recording_ended
      )
    end

    def recording_master_mix_complete
    end

    # create a band invitation message
    def band_invitation(receiver_id, invitation_id, band_id, photo_url, msg, notification_id, created_at)
      band_invitation = Jampb::BandInvitation.new(
          :band_invitation_id => invitation_id,
          :band_id => band_id,
          :photo_url => photo_url,
          :msg => msg,
          :notification_id => notification_id,
          :created_at => created_at
        )

      return Jampb::ClientMessage.new(
        :type => ClientMessage::Type::BAND_INVITATION,
        :route_to => USER_TARGET_PREFIX + receiver_id,
        :band_invitation => band_invitation
      )
    end

    # create a band invitation acceptance message
    def band_invitation_accepted(receiver_id, invitation_id, photo_url, msg, notification_id, created_at)
      band_invitation_accepted = Jampb::BandInvitationAccepted.new(
          :band_invitation_id => invitation_id,
          :photo_url => photo_url,
          :msg => msg,
          :notification_id => notification_id,
          :created_at => created_at
        )

      return Jampb::ClientMessage.new(
        :type => ClientMessage::Type::BAND_INVITATION_ACCEPTED,
        :route_to => USER_TARGET_PREFIX + receiver_id,
        :band_invitation_accepted => band_invitation_accepted
      )
    end

    # create a musician fresh session message
    def musician_session_fresh(session_id, user_id, username, photo_url)
      fresh = Jampb::MusicianSessionFresh.new(
        :session_id => session_id,
        :user_id => user_id,
        :username => username,
        :photo_url => photo_url
      )

      return Jampb::ClientMessage.new(
        :type => ClientMessage::Type::MUSICIAN_SESSION_FRESH,
        :route_to => CLIENT_TARGET,
        :musician_session_fresh => fresh
      )
    end

    # create a musician stale session message
    def musician_session_stale(session_id, user_id, username, photo_url)
      stale = Jampb::MusicianSessionStale.new(
        :session_id => session_id,
        :user_id => user_id,
        :username => username,
        :photo_url => photo_url
      )

      return Jampb::ClientMessage.new(
        :type => ClientMessage::Type::MUSICIAN_SESSION_STALE,
        :route_to => CLIENT_TARGET,
        :musician_session_stale => stale
      )
    end

    # create a test message to send in session
    def test_session_message(session_id, msg)
      test = Jampb::TestSessionMessage.new(:msg => msg)

      return Jampb::ClientMessage.new(
        :type => ClientMessage::Type::TEST_SESSION_MESSAGE,
        :route_to => SESSION_TARGET_PREFIX + session_id,
        :test_session_message => test
      )
    end

    ############## P2P CLIENT MESSAGES #################

    # send a request to do a ping
    def ping_request(client_id, from)
      ping_request = Jampb::PingRequest.new()

      return Jampb::ClientMessage.new(
        :type => ClientMessage::Type::PING_REQUEST,
        :route_to => CLIENT_TARGET_PREFIX + client_id,
        :from => from,
        :ping_request => ping_request
      )
    end

    # respond to a ping_request with an ack
    def ping_ack(client_id, from)
      ping_ack = Jampb::PingAck.new

      return Jampb::ClientMessage.new(
        :type => ClientMessage::Type::PING_ACK,
        :route_to => CLIENT_TARGET_PREFIX + client_id,
        :from => from,
        :ping_ack => ping_ack
      )
    end

    # create a test message to send in session
    def test_client_message(client_id, from, msg)
      test = Jampb::TestClientMessage.new(:msg => msg)

      return Jampb::ClientMessage.new(
        :type => ClientMessage::Type::TEST_CLIENT_MESSAGE,
        :route_to => CLIENT_TARGET_PREFIX + client_id,
        :from => from,
        :test_client_message => test
      )
    end

    ####################################################

    # is this message directed to the server?
    def server_directed? msg
       return msg.route_to == MessageFactory::SERVER_TARGET
    end

    # is this message directed to the client?
    def client_directed? msg
       return msg.route_to.start_with? MessageFactory::CLIENT_TARGET_PREFIX
    end

    # is this message directed to a (music) session?
    def session_directed? msg
       return msg.route_to.start_with? MessageFactory::SESSION_TARGET_PREFIX
    end

    # is this message directed to a user?
    def user_directed? msg
       return msg.route_to.start_with? MessageFactory::USER_TARGET_PREFIX
    end

    def extract_session(msg)
      return msg.route_to[MessageFactory::SESSION_TARGET_PREFIX..-1]
    end

    def get_message_type msg
      return @type_values[msg.type]
    end
  end
end