Boards = new Mongo.Collection('boards');

Boards.attachSchema(new SimpleSchema({
  title: {
    type: String
  },
  slug: {
    type: String
  },
  archived: {
    type: Boolean
  },
  createdAt: {
    type: Date,
    denyUpdate: true
  },
  // XXX Inconsistent field naming
  modifiedAt: {
    type: Date,
    denyInsert: true,
    optional: true
  },
  // De-normalized number of users that have starred this board
  stars: {
    type: Number
  },
  // De-normalized label system
  'labels.$._id': {
    // We don't specify that this field must be unique in the board because that
    // will cause performance penalties and is not necessary since this field is
    // always set on the server.
    // XXX Actually if we create a new label, the `_id` is set on the client
    // without being overwritten by the server, could it be a problem?
    type: String
  },
  'labels.$.name': {
    type: String,
    optional: true
  },
  'labels.$.color': {
    type: String,
    allowedValues: [
      'green', 'yellow', 'orange', 'red', 'purple',
      'blue', 'sky', 'lime', 'pink', 'black'
    ]
  },
  // XXX We might want to maintain more informations under the member sub-
  // documents like de-normalized meta-data (the date the member joined the
  // board, the number of contributions, etc.).
  'members.$.userId': {
    type: String
  },
  'members.$.isAdmin': {
    type: Boolean
  },
  'members.$.isActive': {
    type: Boolean
  },
  permission: {
    type: String,
    allowedValues: ['public', 'private']
  },
  color: {
    type: String,
    allowedValues: ['nephritis', 'pomegranate', 'belize',
            'wisteria', 'midnight', 'pumpkin']
  }
}));

if (Meteor.isServer) {
  Boards.allow({
    insert: Meteor.userId,
    update: allowIsBoardAdmin,
    remove: allowIsBoardAdmin,
    fetch: ['members']
  });

  // The number of users that have starred this board is managed by trusted code
  // and the user is not allowed to update it
  Boards.deny({
    update: function(userId, board, fieldNames) {
      return _.contains(fieldNames, 'stars');
    },
    fetch: []
  });

  // We can't remove a member if it is the last administrator
  Boards.deny({
    update: function(userId, doc, fieldNames, modifier) {
      if (! _.contains(fieldNames, 'members'))
        return false;

      // We only care in case of a $pull operation, ie remove a member
      if (! _.isObject(modifier.$pull && modifier.$pull.members))
        return false;

      // If there is more than one admin, it's ok to remove anyone
      var nbAdmins = _.filter(doc.members, function(member) {
        return member.isAdmin;
      }).length;
      if (nbAdmins > 1)
        return false;

      // If all the previous conditions where verified, we can't remove
      // a user if it's an admin
      var removedMemberId = modifier.$pull.members.userId;
      return !! _.findWhere(doc.members, {
        userId: removedMemberId,
        isAdmin: true
      });
    },
    fetch: ['members']
  });
}

Boards.helpers({
  isPublic: function() {
    return this.permission === 'public';
  },
  lists: function() {
    return Lists.find({ boardId: this._id, archived: false },
                                                          { sort: { sort: 1 }});
  },
  activities: function() {
    return Activities.find({ boardId: this._id }, { sort: { createdAt: -1 }});
  },
  absoluteUrl: function() {
    return Router.path('Board', { boardId: this._id, slug: this.slug });
  },
  colorClass: function() {
    return 'board-color-' + this.color;
  }
});

Boards.before.insert(function(userId, doc) {
  // XXX We need to improve slug management. Only the id should be necessary
  // to identify a board in the code.
  // XXX If the board title is updated, the slug should also be updated.
  // In some cases (Chinese and Japanese for instance) the `getSlug` function
  // return an empty string. This is causes bugs in our application so we set
  // a default slug in this case.
  doc.slug = getSlug(doc.title) || 'board';
  doc.createdAt = new Date();
  doc.archived = false;
  doc.members = [{
    userId: userId,
    isAdmin: true,
    isActive: true
  }];
  doc.stars = 0;
  doc.color = Boards.simpleSchema()._schema.color.allowedValues[0];

  // Handle labels
  var colors = Boards.simpleSchema()._schema['labels.$.color'].allowedValues;
  var defaultLabelsColors = _.clone(colors).splice(0, 6);
  doc.labels = [];
  _.each(defaultLabelsColors, function(val) {
    doc.labels.push({
      _id: Random.id(6),
      name: '',
      color: val
    });
  });

  // We randomly chose one of the default background colors for the board
  if (Meteor.isClient) {
    doc.background = {
      type: 'color',
      color: Random.choice(Boards.simpleSchema()._schema.color.allowedValues)
    };
  }
});

Boards.before.update(function(userId, doc, fieldNames, modifier) {
  modifier.$set = modifier.$set || {};
  modifier.$set.modifiedAt = new Date();
});

if (Meteor.isServer) {
  // Let MongoDB ensure that a member is not included twice in the same board
  Meteor.startup(function() {
    Boards._collection._ensureIndex({
      _id: 1,
      'members.userId': 1
    }, { unique: true });
  });

  // Genesis: the first activity of the newly created board
  Boards.after.insert(function(userId, doc) {
    Activities.insert({
      type: 'board',
      activityTypeId: doc._id,
      activityType: 'createBoard',
      boardId: doc._id,
      userId: userId
    });
  });

  // If the user remove one label from a board, we cant to remove reference of
  // this label in any card of this board.
  Boards.after.update(function(userId, doc, fieldNames, modifier) {
    if (! _.contains(fieldNames, 'labels') ||
      ! modifier.$pull ||
      ! modifier.$pull.labels ||
      ! modifier.$pull.labels._id)
      return;

    var removedLabelId = modifier.$pull.labels._id;
    Cards.update(
      { boardId: doc._id },
      {
        $pull: {
          labels: removedLabelId
        }
      },
      { multi: true }
    );
  });

  // Add a new activity if we add or remove a member to the board
  Boards.after.update(function(userId, doc, fieldNames, modifier) {
    if (! _.contains(fieldNames, 'members'))
      return;

    var memberId;

    // Say hello to the new member
    if (modifier.$push && modifier.$push.members) {
      memberId = modifier.$push.members.userId;
      Activities.insert({
        type: 'member',
        activityType: 'addBoardMember',
        boardId: doc._id,
        userId: userId,
        memberId: memberId
      });
    }

    // Say goodbye to the former member
    if (modifier.$pull && modifier.$pull.members) {
      memberId = modifier.$pull.members.userId;
      Activities.insert({
        type: 'member',
        activityType: 'removeBoardMember',
        boardId: doc._id,
        userId: userId,
        memberId: memberId
      });
    }
  });
}