/*
 * # Semantic - Chatroom
 * http://github.com/jlukic/semantic-ui/
 *
 *
 * Copyright 2014 Contributors
 * Released under the MIT license
 * http://opensource.org/licenses/MIT
 *
 */

;(function ($, window, document, undefined) {

module.exports = function(parameters) {
  var
    $allModules    = $(this),
    moduleSelector = $allModules.selector || '',

    time           = new Date().getTime(),
    performance    = [],

    query          = arguments[0],
    methodInvoked  = (typeof query == 'string'),
    queryArguments = [].slice.call(arguments, 1),
    returnedValue
  ;
  $(this)
    .each(function() {
      var
        settings  = $.extend(true, {}, module.exports.settings, parameters),

        className = settings.className,
        namespace = settings.namespace,
        selector  = settings.selector,
        error     = settings.error,

        $module         = $(this),

        $expandButton   = $module.find(selector.expandButton),
        $userListButton = $module.find(selector.userListButton),

        $userList       = $module.find(selector.userList),
        $room           = $module.find(selector.room),
        $userCount      = $module.find(selector.userCount),

        $log            = $module.find(selector.log),
        $message        = $module.find(selector.message),

        $messageInput   = $module.find(selector.messageInput),
        $messageButton  = $module.find(selector.messageButton),

        instance        = $module.data('module'),
        element         = this,

        html            = '',
        users           = {},

        channel,
        loggedInUser,

        message,
        count,

        height,

        pusher,
        module
      ;

      module = {

        width: {
          log      : $log.width(),
          userList : $userList.outerWidth()
        },

        initialize: function() {

          // check error conditions
          if(Pusher === undefined) {
            module.error(error.pusher);
          }
          if(settings.key === undefined || settings.channelName === undefined) {
            module.error(error.key);
            return false;
          }
          else if( !(settings.endpoint.message || settings.endpoint.authentication) ) {
            module.error(error.endpoint);
            return false;
          }

          // define pusher
          pusher                       = new Pusher(settings.key);
          Pusher.channel_auth_endpoint = settings.endpoint.authentication;

          channel = pusher.subscribe(settings.channelName);

          channel.bind('pusher:subscription_succeeded', module.user.list.create);
          channel.bind('pusher:subscription_error', module.error);
          channel.bind('pusher:member_added', module.user.joined);
          channel.bind('pusher:member_removed', module.user.left);
          channel.bind('update_messages', module.message.receive);

          $.each(settings.customEvents, function(label, value) {
            channel.bind(label, value);
          });

          // bind module events
          $userListButton
            .on('click.' +  namespace, module.event.toggleUserList)
          ;
          $expandButton
            .on('click.'   +  namespace, module.event.toggleExpand)
          ;
          $messageInput
            .on('keydown.' +  namespace, module.event.input.keydown)
            .on('keyup.'   +  namespace, module.event.input.keyup)
          ;
          $messageButton
            .on('mouseenter.' +  namespace, module.event.hover)
            .on('mouseleave.' +  namespace, module.event.hover)
            .on('click.' +  namespace, module.event.submit)
          ;
          // scroll to bottom of chat log
          $log
            .animate({
              scrollTop: $log.prop('scrollHeight')
            }, 400)
          ;
          $module
            .data('module', module)
            .addClass(className.loading)
          ;

        },

        // refresh module
        refresh: function() {
          // reset width calculations
          $userListButton
            .removeClass(className.active)
          ;
          module.width = {
            log      : $log.width(),
            userList : $userList.outerWidth()
          };
          if( $userListButton.hasClass(className.active) ) {
            module.user.list.hide();
          }
          $module.data('module', module);
        },

        user: {

          updateCount: function() {
            if(settings.userCount) {
              users = $module.data('users');
              count = 0;
              $.each(users, function() {
                count++;
              });
              $userCount
                .html( settings.templates.userCount(count) )
              ;
            }
          },

          // add user to user list
          joined: function(member) {
            users = $module.data('users');
            if(member.id != 'anonymous' && users[ member.id ] === undefined ) {
              users[ member.id ] = member.info;
              if(settings.randomColor && member.info.color === undefined) {
                member.info.color = settings.templates.color(member.id);
              }
              html = settings.templates.userList(member.info);
              if(member.info.isAdmin) {
                $(html)
                  .prependTo($userList)
                ;
              }
              else {
                $(html)
                  .appendTo($userList)
                ;
              }
              if(settings.partingMessages) {
                $log
                  .append( settings.templates.joined(member.info) )
                ;
                module.message.scroll.test();
              }
              module.user.updateCount();
            }
          },

          // remove user from user list
          left: function(member) {
            users = $module.data('users');
            if(member !== undefined && member.id !== 'anonymous') {
              delete users[ member.id ];
              $module
                .data('users', users)
              ;
              $userList
                .find('[data-id='+ member.id + ']')
                  .remove()
              ;
              if(settings.partingMessages) {
                $log
                  .append( settings.templates.left(member.info) )
                ;
                module.message.scroll.test();
              }
              module.user.updateCount();
            }
          },

          list: {

            // receives list of members and generates user list
            create: function(members) {
              users = {};
              members.each(function(member) {
                if(member.id !== 'anonymous' && member.id !== 'undefined') {
                  if(settings.randomColor && member.info.color === undefined) {
                    member.info.color = settings.templates.color(member.id);
                  }
                  // sort list with admin first
                  html = (member.info.isAdmin)
                    ? settings.templates.userList(member.info) + html
                    : html + settings.templates.userList(member.info)
                  ;
                  users[ member.id ] = member.info;
                }
              });
              $module
                .data('users', users)
                .data('user', users[members.me.id] )
                .removeClass(className.loading)
              ;
              $userList
                .html(html)
              ;
              module.user.updateCount();
              $.proxy(settings.onJoin, $userList.children())();
            },

            // shows user list
            show: function() {
              $log
                .animate({
                  width: (module.width.log - module.width.userList)
                }, {
                  duration : settings.speed,
                  easing   : settings.easing,
                  complete : module.message.scroll.move
                })
              ;
            },

            // hides user list
            hide: function() {
              $log
                .stop()
                .animate({
                  width: (module.width.log)
                }, {
                  duration : settings.speed,
                  easing   : settings.easing,
                  complete : module.message.scroll.move
                })
              ;
            }

          }

        },

        message: {

          // handles scrolling of chat log
          scroll: {
            test: function() {
              height = $log.prop('scrollHeight') - $log.height();
              if( Math.abs($log.scrollTop() - height) < settings.scrollArea) {
                module.message.scroll.move();
              }
            },

            move: function() {
              height = $log.prop('scrollHeight') - $log.height();
              $log
                .scrollTop(height)
              ;
            }
          },

          // sends chat message
          send: function(message) {
            if( !module.utils.emptyString(message) ) {
              $.api({
                url    : settings.endpoint.message,
                method : 'POST',
                data   : {
                  'message': {
                    content   : message,
                    timestamp : new Date().getTime()
                  }
                }
              });
            }
          },

          // receives chat response and processes
          receive: function(response) {
            message      = response.data;
            users        = $module.data('users');
            loggedInUser = $module.data('user');
            if(users[ message.userID] !== undefined) {
              // logged in user's messages already pushed instantly
              if(loggedInUser === undefined || loggedInUser.id != message.userID) {
                message.user = users[ message.userID ];
                module.message.display(message);
              }
            }
          },

          // displays message in chat log
          display: function(message) {
            $log
              .append( settings.templates.message(message) )
            ;
            module.message.scroll.test();
            $.proxy(settings.onMessage, $log.children().last() )();
          }

        },

        expand: function() {
          $module
            .addClass(className.expand)
          ;
          $.proxy(settings.onExpand, $module )();
          module.refresh();
        },

        contract: function() {
          $module
            .removeClass(className.expand)
          ;
          $.proxy(settings.onContract, $module )();
          module.refresh();
        },

        event: {

          input: {

            keydown: function(event) {
              if(event.which == 13) {
                $messageButton
                  .addClass(className.down)
                ;
              }
            },

            keyup: function(event) {
              if(event.which == 13) {
                $messageButton
                  .removeClass(className.down)
                ;
                module.event.submit();
              }
            }

          },

          // handles message form submit
          submit: function() {
            var
              message      = $messageInput.val(),
              loggedInUser = $module.data('user')
            ;
            if(loggedInUser !== undefined && !module.utils.emptyString(message)) {
              module.message.send(message);
              // display immediately
              module.message.display({
                user: loggedInUser,
                text: message
              });
              module.message.scroll.move();
              $messageInput
                .val('')
              ;

            }
          },

          // handles button click on expand button
          toggleExpand: function() {
            if( !$module.hasClass(className.expand) ) {
              $expandButton
                .addClass(className.active)
              ;
              module.expand();
            }
            else {
              $expandButton
                .removeClass(className.active)
              ;
              module.contract();
            }
          },

          // handles button click on user list button
          toggleUserList: function() {
            if( !$log.is(':animated') ) {
              if( !$userListButton.hasClass(className.active) ) {
                $userListButton
                  .addClass(className.active)
                ;
                module.user.list.show();
              }
              else {
                $userListButton
                  .removeClass('active')
                ;
                module.user.list.hide();
              }
            }

          }
        },

        utils: {

          emptyString: function(string) {
            if(typeof string == 'string') {
              return (string.search(/\S/) == -1);
            }
            return false;
          }

        },

      setting: function(name, value) {
        if(value !== undefined) {
          if( $.isPlainObject(name) ) {
            $.extend(true, settings, name);
          }
          else {
            settings[name] = value;
          }
        }
        else {
          return settings[name];
        }
      },
      internal: function(name, value) {
        if( $.isPlainObject(name) ) {
          $.extend(true, module, name);
        }
        else if(value !== undefined) {
          module[name] = value;
        }
        else {
          return module[name];
        }
      },
      debug: function() {
        if(settings.debug) {
          if(settings.performance) {
            module.performance.log(arguments);
          }
          else {
            module.debug = Function.prototype.bind.call(console.info, console, settings.name + ':');
            module.debug.apply(console, arguments);
          }
        }
      },
      verbose: function() {
        if(settings.verbose && settings.debug) {
          if(settings.performance) {
            module.performance.log(arguments);
          }
          else {
            module.verbose = Function.prototype.bind.call(console.info, console, settings.name + ':');
            module.verbose.apply(console, arguments);
          }
        }
      },
      error: function() {
        module.error = Function.prototype.bind.call(console.error, console, settings.name + ':');
        module.error.apply(console, arguments);
      },
      performance: {
        log: function(message) {
          var
            currentTime,
            executionTime,
            previousTime
          ;
          if(settings.performance) {
            currentTime   = new Date().getTime();
            previousTime  = time || currentTime;
            executionTime = currentTime - previousTime;
            time          = currentTime;
            performance.push({
              'Element'        : element,
              'Name'           : message[0],
              'Arguments'      : [].slice.call(message, 1) || '',
              'Execution Time' : executionTime
            });
          }
          clearTimeout(module.performance.timer);
          module.performance.timer = setTimeout(module.performance.display, 100);
        },
        display: function() {
          var
            title = settings.name + ':',
            totalTime = 0
          ;
          time = false;
          clearTimeout(module.performance.timer);
          $.each(performance, function(index, data) {
            totalTime += data['Execution Time'];
          });
          title += ' ' + totalTime + 'ms';
          if(moduleSelector) {
            title += ' \'' + moduleSelector + '\'';
          }
          if( (console.group !== undefined || console.table !== undefined) && performance.length > 0) {
            console.groupCollapsed(title);
            if(console.table) {
              console.table(performance);
            }
            else {
              $.each(performance, function(index, data) {
                console.log(data['Name'] + ': ' + data['Execution Time']+'ms');
              });
            }
            console.groupEnd();
          }
          performance = [];
        }
      },
      invoke: function(query, passedArguments, context) {
        var
          maxDepth,
          found
        ;
        passedArguments = passedArguments || queryArguments;
        context         = element         || context;
        if(typeof query == 'string' && instance !== undefined) {
          query    = query.split(/[\. ]/);
          maxDepth = query.length - 1;
          $.each(query, function(depth, value) {
            if( $.isPlainObject( instance[value] ) && (depth != maxDepth) ) {
              instance = instance[value];
            }
            else if( instance[value] !== undefined ) {
              found = instance[value];
            }
            else {
              module.error(error.method, query);
            }
          });
        }
        if ( $.isFunction( found ) ) {
          return found.apply(context, passedArguments);
        }
        return found || false;
      }
    };

    if(methodInvoked) {
      if(instance === undefined) {
        module.initialize();
      }
      module.invoke(query);
    }
    else {
      if(instance !== undefined) {
        module.destroy();
      }
      module.initialize();
    }
  })
;
  return (returnedValue !== undefined)
    ? returnedValue
    : this
  ;
};

  module.exports.settings = {

    name            : 'Chat',
    debug           : false,
    namespace       : 'chat',

    channel         : 'present-chat',

    onJoin          : function(){},
    onMessage       : function(){},
    onExpand        : function(){},
    onContract      : function(){},

    customEvents    : {},

    partingMessages : false,
    userCount       : true,
    randomColor     : true,

    speed           : 300,
    easing          : 'easeOutQuint',

    // pixels from bottom of chat log that should trigger auto scroll to bottom
    scrollArea      : 9999,

    endpoint        : {
      message        : false,
      authentication : false
    },

    error: {
      method   : 'The method you called is not defined',
      endpoint : 'Please define a message and authentication endpoint.',
      key      : 'You must specify a pusher key and channel.',
      pusher   : 'You must include the Pusher library.'
    },

    className   : {
      expand  : 'expand',
      active  : 'active',
      hover   : 'hover',
      down    : 'down',
      loading : 'loading'
    },

    selector    : {
      userCount      : '.actions .message',
      userListButton : '.actions .list.button',
      expandButton   : '.actions .expand.button',
      room           : '.room',
      userList       : '.room .list',
      log            : '.room .log',
      message        : '.room .log .message',
      author         : '.room log .message .author',
      messageInput   : '.talk input',
      messageButton  : '.talk .send.button'
    },

    templates: {

      userCount: function(number) {
        return number + ' users in chat';
      },

      color: function(userID) {
        var
          colors = [
            '#000000',
            '#333333',
            '#666666',
            '#999999',
            '#CC9999',
            '#CC6666',
            '#CC3333',
            '#993333',
            '#663333',
            '#CC6633',
            '#CC9966',
            '#CC9933',
            '#999966',
            '#CCCC66',
            '#99CC66',
            '#669933',
            '#669966',
            '#33A3CC',
            '#336633',
            '#33CCCC',
            '#339999',
            '#336666',
            '#336699',
            '#6666CC',
            '#9966CC',
            '#333399',
            '#663366',
            '#996699',
            '#993366',
            '#CC6699'
          ]
        ;
        return colors[ Math.floor( Math.random() * colors.length) ];
      },

      message: function(message) {
        var
          html = ''
        ;
        if(message.user.isAdmin) {
          message.user.color = '#55356A';
          html += '<div class="admin message">';
          html += '<span class="quirky ui flag team"></span>';
        }
        /*
        else if(message.user.isPro) {
          html += '<div class="indent message">';
          html += '<span class="quirky ui flag pro"></span>';
        }
        */
        else {
          html += '<div class="message">';
        }
        html += '<p>';
        if(message.user.color !== undefined) {
          html += '<span class="author" style="color: ' + message.user.color + ';">' + message.user.name + '</span>: ';
        }
        else {
          html += '<span class="author">' + message.user.name + '</span>: ';
        }
        html += ''
          +   message.text
          + ' </p>'
          + '</div>'
        ;
        return html;
      },

      joined: function(member) {
        return (typeof member.name !== undefined)
          ? '<div class="status">' + member.name + ' has joined the chat.</div>'
          : false
        ;
      },
      left: function(member) {
        return (typeof member.name !== undefined)
          ? '<div class="status">' + member.name + ' has left the chat.</div>'
          : false
        ;
      },

      userList: function(member) {
        var
          html = ''
        ;
        if(member.isAdmin) {
          member.color = '#55356A';
        }
        html +=  ''
          + '<div class="user" data-id="' + member.id + '">'
          + ' <div class="image">'
          + '   <img src="' + member.avatarURL + '">'
          + ' </div>'
        ;
        if(member.color !== undefined) {
          html += ' <p><a href="/users/' + member.id + '" target="_blank" style="color: ' + member.color + ';">' + member.name + '</a></p>';
        }
        else {
          html += ' <p><a href="/users/' + member.id + '" target="_blank">' + member.name + '</a></p>';
        }
        html += '</div>';
        return html;
      }

    }

  };

})( require("jquery"), window , document );