SimpleRouter = FilteredRouter.extend({
  
  initialize: function() {
    FilteredRouter.prototype.initialize.call(this);
    this.filter(this.require_login, {only: ['submit']});
    this.filter(this.start_request);
    this.filter(this.require_profile);
    this.filter(this.requirePost, {only: ['post_page', 'post_edit']});
  },

  start_request: function(page){
    // runs at every new page change

    // openedComments is an Array that tracks which comments
    // have been expanded by the user, to make sure they stay expanded
    Session.set("openedComments", null);

    // currentScroll stores the position of the user in the page
    Session.set('currentScroll', null);

    document.title = getSetting("title");

    // set all errors who have already been seen to not show anymore
    clearSeenErrors();
    
    // log this request with mixpanel, etc
    instrumentRequest();
    
    return page;
  },

  require_login: function(page) {
    if (Meteor.user()) {
      return page;
    } else {
      return 'signin';
    }
  },

  // if the user is logged in but their profile isn't filled out enough
  require_profile: function(page) {
    var user = Meteor.user();
    if (user && Meteor.userLoaded() && ! userProfileComplete(user)){
      Session.set('selectedUserId', user._id);
      return 'user_email';
    } else {
      return page;
    }
  },
  
  // if we are on a page that requires a post, as set in selectedPostId
  requirePost: function(page) {
    if (Posts.findOne(Session.get('selectedPostId'))) {
      return page;
    } else if (! Session.get('postReady')) {
      return 'loading';
    } else {
      return 'not_found';
    }
  },
  
  requireSettings: function() {
    // TO DO
  },

  // wait for the subscription to be ready, this one is only used manually
  awaitSubscription: function(page, subName) {
    return Session.get(subName) ? page : 'loading';
  },
  
  routes: {
    '': 'top',
    'top':'top',
    'top/':'top',
    'top/:page':'top',
    'new':'new',
    'new/':'new',
    'new/:page':'new',
    'pending':'pending',
    'digest/:year/:month/:day':'digest',
    'digest':'digest',
    'digest/':'digest',
    'test':'test',
    'signin':'signin',
    'signup':'signup',
    'submit':'submit',
    'invite':'invite',
    'posts/deleted':'post_deleted',
    'posts/:id/edit':'post_edit',
    'posts/:id/comment/:comment_id':'post',
    'posts/:id':'post',
    'comments/deleted':'comment_deleted',   
    'comments/:id':'comment',
    'comments/:id/reply':'comment_reply',
    'comments/:id/edit':'comment_edit',
    'settings':'settings',
    'admin':'admin',
    'categories':'categories',
    'users':'users',
    'account':'user_edit',
    'forgot_password':'forgot_password',
    'users/:id': 'user_profile',
    'users/:id/edit':'user_edit',
    ':year/:month/:day':'digest',
  },
  top: function() {
    var self = this;
    
    // XXX: where do we go if not? Should the if be in the goto (so it's reactive?)
    if(canView(Meteor.user(), 'replace')) {
      self.goto(function() {
        return self.awaitSubscription('posts_top', 'topPostsReady');
      });
    }
  },
  new: function(page) {
    var self = this;
    
    if(canView(Meteor.user(), 'replace')) {
      self.goto(function() {
        return self.awaitSubscription('posts_new', 'newPostsReady');
      });
    }
  },
  pending: function(page) {
    var self = this;
    if(canPost(Meteor.user(), 'replace')) {
      self.goto(function() {
        return self.awaitSubscription('posts_pending', 'pendingPostsReady');
      });
    }
  },  
  digest: function(year, month, day){
    var self = this;
    
    if(canView(Meteor.user(), 'replace')) {
      var date = (typeof day === 'undefined') ? new Date() : new Date(year, month-1, day);
      
      sessionSetObject('currentDate', date);
      
      self.goto(function() {
        return self.awaitSubscription('posts_digest', 'digestPostsReady');
      });
    } 
  },
  post: function(id, commentId) {
    var self = this;

    Session.set('selectedPostId', id);
    if(typeof commentId !== 'undefined')
      Session.set('scrollToCommentId', commentId); 
        
    // on post page, we show the comment recursion
    window.repress_recursion=false;
    // reset the new comment time at each new request of the post page
    window.newCommentTimestamp=new Date();

    self.goto(function() {
      return self.awaitSubscription('post_page', 'postReady');
    });
  },
  post_edit: function(id) {
    var self = this;

    Session.set('selectedPostId', id); 
    self.goto(function() {
      return self.awaitSubscription('post_edit', 'postReady');
    });
  },
  comment: function(id) {
    var self = this;

    Session.set('selectedCommentId', id);
    window.repress_recursion=true;
    window.newCommentTimestamp=new Date();
    self.goto(function() {
      return self.awaitSubscription('comment_page', 'commentReady');
    });
  },
  comment_reply: function(id) {
    var self = this;

    Session.set('selectedCommentId', id);
    window.repress_recursion=true;
    window.newCommentTimestamp=new Date();
    self.goto(function() {
      return self.awaitSubscription('comment_reply', 'commentReady');
    });
  },
  comment_edit: function(id) {
    var self = this;
    
    Session.set('selectedCommentId', id);
    window.newCommentTimestamp=new Date();
    self.goto(function() {
      return self.awaitSubscription('comment_edit', 'commentReady');
    });
  },
  user_profile: function(id){
    if(typeof id !== undefined){
      Session.set('selectedUserId', id);
    }
    this.goto('user_profile');
  },
  user_edit: function(id){
    if(typeof id !== undefined){
      Session.set('selectedUserId', id);
    }
    this.goto('user_edit');
  },
  signup: function() { this.goto('signup'); },
  signin: function() { this.goto('signin'); },
  invite: function() { this.goto('no_invite'); },
  submit: function() { this.goto('post_submit'); },
  settings: function() { this.goto('settings'); },
  users: function() { this.goto('users'); },
  post_deleted: function() { this.goto('post_deleted'); },
  comment_deleted: function() { this.goto('comment_deleted'); },
  forgot_password: function() { this.goto('user_password'); },
  admin: function() { this.goto('admin'); },
  categories: function() { this.goto('categories'); }  
});
  
var Router = new SimpleRouter();