/**
 * @isTemplate true
 * @memberOf Template
 * @function dynamic
 * @summary Choose a template to include dynamically, by name.
 * @locus Templates
 * @param {String} template The name of the template to include.
 * @param {Object} [data] Optional. The data context in which to include the template.
 */

Template.__dynamicWithDataContext.helpers({
  chooseTemplate: function (name) {
    return Template[name] || null;
  }
});

Template.__dynamic.helpers({
  dataContextPresent: function () {
    return _.has(this, "data");
  },
  checkContext: function () {
    if (! _.has(this, "template")) {
      throw new Error("Must specify name in the 'template' argument " +
                      "to {{> Template.dynamic}}.");
    }

    _.each(this, function (v, k) {
      if (k !== "template" && k !== "data") {
        throw new Error("Invalid argument to {{> Template.dynamic}}: " +
                        k);
      }
    });
  }
});