class WsChatController < WsController
 

     def start_polling_messages
         connection_store[:clients].each do |client|
             client.add_message_callback do |message|

                 #noinspection RubyAssignmentExpressionInConditionalInspection

                 if message.body

                     process_incoming_message(message.from, message.to, message.body, message.attribute('chat_id').to_s)

                 elsif request = message.first_element('sync_contacts_request')
                     # toto mozem prijat len ako admin multichatu
                     send_contacts(message.from, message.to, request.attribute('chat_id').to_s)
                 elsif answer = message.first_element('synced_contacts')
                     # toto mozem prijat len ako ucastnik multichatu (nie admin)
                     contacts = xml_contacts_to_array(answer)

                     set_contacts_in_multichat(find_client(message.to.strip.to_s), answer.attribute('chat_id').to_s, message.from.to_s, contacts)

                     sync_contacts_frontend(message.from, message.to, answer.attribute('chat_id').to_s, contacts)

                 elsif answer = message.first_element('exported_chat')
                     contacts = xml_contacts_to_array(message.first_element('exported_chat'))
                     import_people_in_chat(message.from, message.to, answer.attribute('chat_id').to_s, contacts)

                 elsif message.attribute('destroy_multichat')
                     destroy_multichat(message.to, message.attribute('chat_id').to_s)
                 elsif message.attribute('req_update_contacts')
                     added   = xml_contacts_to_array(message.first_element('added'))
                     removed = xml_contacts_to_array(message.first_element('removed'))
                     update_attendants_in_multichat(message.from, message.to, message.attribute('chat_id').to_s, removed, added)

                 end
                 #TODO: upozornit na pisanie spravy
                 #TODO: odoslat informaciu o tom, ze pisem spravu
                 #else
                 #    send_message 'app.chat.messageState',
                 #                 state: message.chat_state,
                 #                 from: message.from.strip.to_s,
                 #                 to: message.to.strip.to_s,
                 #                 message: message.body,
                 #                 chat_id: if message.attribute(:is_simulating) then message.attribute(:chat_id) end
             end
         end
     end
 

     def import_people_in_chat(owner, me, chat_id, contacts)

         #Rails.logger.debug ['imported chat arrived', message.to_s, chat_id]

         client = find_client(me.strip.to_s)

         set_contacts_in_multichat(client, chat_id, owner.to_s, contacts)

 
         send_message 'app.chat.importChat',

                      owner:    owner.strip.to_s,

                      chat_id:  chat_id,

                      contacts: strip_all(contacts)

     end
 

     # Owner vytvori najprv u seba novy multichat

     def new_multichat

         me = message[:chatOwner]

         hash = Digest::SHA2.hexdigest(me)

         chat_id = hash + Time.now.to_f.to_s

         client = find_client(me)
 

         set_contacts_in_multichat(client, chat_id, client.jid.to_s)

         trigger_success id: chat_id

     end
 

     # Owner posle novemu cloveku informaciu o chat_id a kontaktoch

     def add_to_multichat

         client = find_client(message[:chatOwner])
 

         chat_id  = message[:chatId]

         add      = message[:jid]

         add_resource = find_multichat_supported(add)

         if add_resource
             connection_store[:opened_chats][client][chat_id][:attendants] << add_resource
             #Rails.logger.debug ['adding to multichat', add_resource]

             contacts = connection_store[:opened_chats][client][chat_id][:attendants]

             contacts.each do |contact|
                 client.send(MessageBuilder::export_multichat(client.jid.to_s, contact, chat_id, contacts))
             end

             trigger_success
         else
             #Rails.logger.debug ['adding to multichat failure', connection_store[:presences][add]]
             trigger_failure
         end

     end

 
     def send_chat_message

         me = message[:from]
         client = find_client(me)

         my_jid = client.jid.to_s

         if client

             chat_id = message[:chatId]
             if chat_id

                 attendants = connection_store[:opened_chats][client][chat_id][:attendants] + [connection_store[:opened_chats][client][chat_id][:owner]]

                 attendants -= [my_jid]

                 messages = MessageBuilder::build_multi_messages(message[:message], my_jid, attendants, chat_id)

             else

                 messages = [MessageBuilder::build_message(message[:message], my_jid, message[:to])]

             end

 
             # Xmpp4r doesn't support XEP-0033 (multicast messages)
             messages.each do |message|
                 client.send(message)
             end
 

             trigger_success message[:message]
         else
             trigger_failure

         end
     end
 

     def request_sync_chat_contacts

         client = find_client(message[:me])
         chat_id = message[:chatId]
 
         owner = connection_store[:opened_chats][client][chat_id][:owner]
         client.send(MessageBuilder::ask_for_multichat_contacts(client.jid.strip.to_s, owner, chat_id))
     end
 

     def i_closed_multichat
         chat_id = message[:chatId]
         client  = find_client(message[:me])

         me      = client.jid.to_s

         owner   = connection_store[:opened_chats][client][chat_id][:owner]
 
         if owner == me
             attendants = connection_store[:opened_chats][client][chat_id][:attendants]
             attendants.each do |attendant|

                 client.send(MessageBuilder::kick_from_multichat(me, attendant, chat_id))

             end
         else
             changes = {removed: [me]}
             client.send(MessageBuilder::req_update_multichat_contacts(me, owner, chat_id, changes))
         end

 
         connection_store[:opened_chats][client].delete(chat_id)

     end
 

     def kick_from_multichat
         chat_id = message[:chatId]
         client  = find_client(message[:me])
         kick_stripped = message[:kick]
 
         contacts = connection_store[:opened_chats][client][chat_id][:attendants]
         kick = contacts.find do |contact|
             contact =~ /^#{kick_stripped}/
         end
 
         return if kick.nil?
 
         contacts -= [kick]
         connection_store[:opened_chats][client][chat_id][:attendants] = contacts
 
         client.send(MessageBuilder::kick_from_multichat(client.jid.to_s, kick, chat_id))
 
         if contacts.empty?
             connection_store[:opened_chats][client].delete(chat_id)
             send_message 'app.chat.destroyMultichat', chat_id: chat_id
         else
             contacts.each do |contact|
                 client.send(MessageBuilder::send_multichat_contacts(client.jid.to_s, contact, chat_id, contacts))
             end
         end
     end
 

     private
 

     def process_incoming_message(from, to, body, chat_id = nil)

         send_message 'app.chat.messageReceived',

                      from: from.to_s,
                      to: to.strip.to_s,

                      message: body,
                      chat_id: chat_id

     end

     def send_contacts(to, me, chat_id)
         client = find_client(me.strip.to_s)

         contacts = connection_store[:opened_chats][client][chat_id][:attendants]

         client.send(MessageBuilder::send_multichat_contacts(me.to_s, to.to_s, chat_id, contacts))

     end
 

     def update_attendants_in_multichat(owner, me, chat_id, removed, added)
         client = find_client(me.strip.to_s)

 
         contacts = connection_store[:opened_chats][client][chat_id][:attendants]

         contacts -= removed
         contacts += added

 
         connection_store[:opened_chats][client][chat_id][:attendants] = contacts
 
         if contacts.empty?

             destroy_multichat(me, chat_id)

         else
             contacts.each do |contact|

                 client.send(MessageBuilder::send_multichat_contacts(me.to_s, contact, chat_id, contacts))

             end

             sync_contacts_frontend(owner, me, chat_id, contacts)

         end
     end

 end