'use strict';

angular.module('habitrpg')
.factory('Pusher', ['$rootScope', 'STORAGE_SETTINGS_ID', 'Groups', 'Shared', '$state', 'Chat',
  function($rootScope, STORAGE_SETTINGS_ID, Groups, Shared, $state, Chat) {
    var settings = JSON.parse(localStorage.getItem(STORAGE_SETTINGS_ID));
    var IS_PUSHER_ENABLED = window.env['PUSHER:ENABLED'] === 'true';

    var partyId;
    var onActivityEvent;

    var api = {
      pusher: undefined,
      socketId: undefined, // when defined the user is connected
    };

    function connectToPusher (partyId, reconnecting) {
      api.pusher = new Pusher(window.env['PUSHER:KEY'], {
        encrypted: true,
        authEndpoint: '/api/v3/user/auth/pusher',
        auth: {
          headers: {
            'x-api-user': settings && settings.auth && settings.auth.apiId,
            'x-api-key': settings && settings.auth && settings.auth.apiToken,
          },
        },
      });

      // Disconnect after 30m of inactivity
      var DISCONNECTION_AFTER = 1800000; // 30m
      var disconnectionTimeout;

      var awaitIdle = function() {
        if(disconnectionTimeout) clearTimeout(disconnectionTimeout);
        disconnectionTimeout = setTimeout(function () {
          $(document).off('mousemove keydown mousedown touchstart', awaitIdle);
          disconnectPusher();
        }, DISCONNECTION_AFTER);
      };

      awaitIdle();
      $(document).on('mousemove keydown mousedown touchstart', awaitIdle);

      api.pusher.connection.bind('error', function(err) {
        console.error(err);
        // TODO if( err.data.code === 4004 ) detected connection limit
      });

      api.pusher.connection.bind('connected', function () {
        $rootScope.pusherSocketId = api.socketId = api.pusher.connection.socket_id;
      });

      var partyChannelName = 'presence-group-' + partyId;
      var partyChannel = api.pusher.subscribe(partyChannelName);

      // When an error occurs while joining the channel
      partyChannel.bind('pusher:subscription_error', function(status) {
        console.error('Impossible to join the Pusher channel for your party, status: ', status);
      });

      // When the user correctly enters the party channel
      partyChannel.bind('pusher:subscription_succeeded', function(pusherMembers) {
        // Wait for the party to be loaded
        Groups.party(reconnecting ? true : false).then(function (party) {
          // If we just reconnected after some inactivity, sync the party
          if (reconnecting === true) {
            _.assign($rootScope.party, party);
            $rootScope.loadingParty = false; // make sure the party is set as loaded
          }

          $rootScope.party.onlineUsers = pusherMembers.count;
          
          $rootScope.party.members.forEach(function (member) {
            if (pusherMembers.members[member._id]) {
              member.online = true;
            }
          });
        });
        
        // When a member enters the party channel
        partyChannel.bind('pusher:member_added', function(pusherMember) {
          $rootScope.$apply(function() {
            $rootScope.party.members.find(function (partyMember) {
              if (partyMember._id === pusherMember.id) {
                partyMember.online = true;
                return true;
              }
            });
            $rootScope.party.onlineUsers++;
          });
        });

        // When a member leaves the party channel
        partyChannel.bind('pusher:member_removed', function(pusherMember) {
          $rootScope.$apply(function() {
            $rootScope.party.onlineUsers--;
            $rootScope.party.members.find(function (partyMember) {
              if (partyMember._id === pusherMember.id) {
                partyMember.online = false;
                return true;
              }
            });
          }); 
        });
      });

      // When the user is booted from the party, they get disconnected from Pusher
      partyChannel.bind('user-removed', function (data) {
        if (data.userId === user._id) {
          api.pusher.unsubscribe(partyChannelName);
        }
      });

      // Same when the user leaves the party
      partyChannel.bind('user-left', function (data) {
        if (data.userId === user._id) {
          api.pusher.unsubscribe(partyChannelName);
        }
      });

      // When a new chat message is posted
      partyChannel.bind('new-chat', function (data) {
        Groups.party().then(function () { // wait for the party to be fully loaded
          $rootScope.loadingParty = false; // make sure the party is set as loaded

          // Update the party data
          Groups.data.party.chat.unshift(data);
          Groups.data.party.chat.splice(200);

          // If a system message comes in, sync the party as quest status may have changed
          if (data.uuid === 'system') {
            Groups.party(true).then(function (syncedParty) {
              // Assign and not replace so that all the references get the modifications
              _.assign($rootScope.party, syncedParty);
            });
          }

          if ($state.is('options.social.party')) { // if we're on the party page, mark the chat as read
            Chat.markChatSeen($rootScope.party._id);
          } else { // show a notification
            $rootScope.User.user.newMessages[$rootScope.party._id] = {
              name: $rootScope.party.name,
              value: true,
            };
          }
        });
      });
    };

    function disconnectPusher () {
      api.pusher.disconnect();

      var awaitActivity = function() {
        $(document).off('mousemove keydown mousedown touchstart', awaitActivity);
        connectToPusher(partyId, true);
      };

      $(document).on('mousemove keydown mousedown touchstart', awaitActivity);
    };

    // Setup chat channels once app is ready, only for parties for now
    var clearAppLoadedListener = $rootScope.$watch('appLoaded', function (after) {
      if (!after) return;
      clearAppLoadedListener(); // clean the event listerner

      if (!IS_PUSHER_ENABLED) return;

      var user = $rootScope.user;

      // Connect the user to Pusher and to the party's chat channel
      partyId = user && $rootScope.user.party && $rootScope.user.party._id;
      if (!partyId) return;

      connectToPusher(partyId);
    });

    return api;
  }]);