///<reference path="../../headers/common.d.ts" />

import _ from "lodash";
import coreModule from "app/core/core_module";
import Drop from "tether-drop";

export function infoPopover() {
  return {
    restrict: "E",
    template: '<i class="fa fa-info-circle"></i>',
    transclude: true,
    link: function(scope, elem, attrs, ctrl, transclude) {
      var offset = attrs.offset || "0 -10px";
      var position = attrs.position || "right middle";
      var classes = "drop-help drop-hide-out-of-bounds";
      var openOn = "hover";

      elem.addClass("gf-form-help-icon");

      if (attrs.wide) {
        classes += " drop-wide";
      }

      if (attrs.mode) {
        elem.addClass("gf-form-help-icon--" + attrs.mode);
      }

      transclude(function(clone, newScope) {
        var content = document.createElement("div");
        content.className = "markdown-html";

        _.each(clone, node => {
          content.appendChild(node);
        });

        var drop = new Drop({
          target: elem[0],
          content: content,
          position: position,
          classes: classes,
          openOn: openOn,
          hoverOpenDelay: 400,
          tetherOptions: {
            offset: offset,
            constraints: [
              {
                to: "window",
                attachment: "together",
                pin: true
              }
            ]
          }
        });

        var unbind = scope.$on("$destroy", function() {
          drop.destroy();
          unbind();
        });
      });
    }
  };
}

coreModule.directive("infoPopover", infoPopover);