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

import angular from "angular";
import coreModule from "../core_module";

export class DeltaCtrl {
  observer: any;

  /** @ngInject */
  constructor(private $rootScope) {
    const waitForCompile = mutations => {
      if (mutations.length === 1) {
        this.$rootScope.appEvent("json-diff-ready");
      }
    };

    this.observer = new MutationObserver(waitForCompile);

    const observerConfig = {
      attributes: true,
      attributeFilter: ["class"],
      characterData: false,
      childList: true,
      subtree: false
    };

    this.observer.observe(angular.element(".delta-html")[0], observerConfig);
  }

  $onDestroy() {
    this.observer.disconnect();
  }
}

export function delta() {
  return {
    controller: DeltaCtrl,
    replace: false,
    restrict: "A"
  };
}
coreModule.directive("diffDelta", delta);

// Link to JSON line number
export class LinkJSONCtrl {
  /** @ngInject */
  constructor(private $scope, private $rootScope, private $anchorScroll) {}

  goToLine(line: number) {
    let unbind;

    const scroll = () => {
      this.$anchorScroll(`l${line}`);
      unbind();
    };

    this.$scope.switchView().then(() => {
      unbind = this.$rootScope.$on("json-diff-ready", scroll.bind(this));
    });
  }
}

export function linkJson() {
  return {
    controller: LinkJSONCtrl,
    controllerAs: "ctrl",
    replace: true,
    restrict: "E",
    scope: {
      line: "@lineDisplay",
      link: "@lineLink",
      switchView: "&"
    },
    template: `<a class="diff-linenum btn btn-inverse btn-small" ng-click="ctrl.goToLine(link)">Line {{ line }}</a>`
  };
}
coreModule.directive("diffLinkJson", linkJson);