discourse/app/assets/javascripts/admin/addon/routes/admin-customize-themes.js

import { action } from "@ember/object";
import { inject as service } from "@ember/service";
import Route from "@ember/routing/route";
import showModal from "discourse/lib/show-modal";
import I18n from "I18n";
import { next } from "@ember/runloop";

export default class AdminCustomizeThemesRoute extends Route {
  @service dialog;

  queryParams = {
    repoUrl: null,
    repoName: null,
  };

  model() {
    return this.store.findAll("theme");
  }

  setupController(controller, model) {
    super.setupController(controller, model);
    controller.set("editingTheme", false);

    if (controller.repoUrl) {
      next(() => {
        showModal("admin-install-theme", {
          admin: true,
        }).setProperties({
          uploadUrl: controller.repoUrl,
          uploadName: controller.repoName,
          selection: "directRepoInstall",
        });
      });
    }
  }

  @action
  installModal() {
    const currentTheme = this.controllerFor("adminCustomizeThemes.show").model;
    if (currentTheme?.warnUnassignedComponent) {
      this.dialog.yesNoConfirm({
        message: I18n.t("admin.customize.theme.unsaved_parent_themes"),
        didConfirm: () => {
          currentTheme.set("recentlyInstalled", false);
          showModal("admin-install-theme", { admin: true });
        },
      });
    } else {
      showModal("admin-install-theme", { admin: true });
    }
  }

  @action
  addTheme(theme) {
    this.refresh();
    theme.setProperties({ recentlyInstalled: true });
    this.transitionTo("adminCustomizeThemes.show", theme.get("id"), {
      queryParams: {
        repoName: null,
        repoUrl: null,
      },
    });
  }
}