DEV: Introduce dedicated controller and route for `discovery.filter` (#20837)

Instead of being tied to the old implementation and constraints, a
dedicated route and controller for the `discovery.filter` app route will
allow us to iterate on changes much faster.

app/assets/javascripts/discourse/app/components/d-navigation.hbs

@@ -1,33 +1,19 @@
-{{#if this.isQueryFilterMode}}
-  <div class="topic-query-filter">
-    <div class="topic-query-filter__input">
-      {{d-icon "filter" class="topic-query-filter__icon"}}
-      <Input
-        class="topic-query-filter__filter-term"
-        @value={{this.queryString}}
-        @enter={{action @updateTopicsListQueryParams this.queryString}}
-        @type="text"
-      />
-    </div>
-  </div>
-{{else}}
-  <BreadCrumbs
-    @categories={{this.categories}}
-    @category={{this.category}}
-    @noSubcategories={{this.noSubcategories}}
-    @tag={{this.tag}}
-    @additionalTags={{this.additionalTags}}
-  />
+<BreadCrumbs
+  @categories={{this.categories}}
+  @category={{this.category}}
+  @noSubcategories={{this.noSubcategories}}
+  @tag={{this.tag}}
+  @additionalTags={{this.additionalTags}}
+/>
 
-  {{#unless this.additionalTags}}
-    {{! nav bar doesn't work with tag intersections }}
-    <NavigationBar
-      @navItems={{this.navItems}}
-      @filterMode={{this.filterMode}}
-      @category={{this.category}}
-    />
-  {{/unless}}
-{{/if}}
+{{#unless this.additionalTags}}
+  {{! nav bar doesn't work with tag intersections }}
+  <NavigationBar
+    @navItems={{this.navItems}}
+    @filterMode={{this.filterMode}}
+    @category={{this.category}}
+  />
+{{/unless}}
 
 <div class="navigation-controls">
   {{#if (and this.notCategoriesRoute this.site.mobileView this.canBulk)}}

app/assets/javascripts/discourse/app/components/d-navigation.js

@@ -6,18 +6,11 @@ import { NotificationLevels } from "discourse/lib/notification-levels";
 import { getOwner } from "discourse-common/lib/get-owner";
 import { htmlSafe } from "@ember/template";
 import { inject as service } from "@ember/service";
-import { equal } from "@ember/object/computed";
 
 export default Component.extend(FilterModeMixin, {
   router: service(),
   dialog: service(),
   tagName: "",
-  queryString: "",
-
-  init() {
-    this._super(...arguments);
-    this.queryString = this.filterQueryString;
-  },
 
   // Should be a `readOnly` instead but some themes/plugins still pass
   // the `categories` property into this component
@@ -147,8 +140,6 @@ export default Component.extend(FilterModeMixin, {
     return controller.canBulkSelect;
   },
 
-  isQueryFilterMode: equal("filterMode", "filter"),
-
   actions: {
     changeCategoryNotificationLevel(notificationLevel) {
       this.category.setNotification(notificationLevel);

app/assets/javascripts/discourse/app/controllers/discovery-filter.js

@@ -0,0 +1,33 @@
+import Controller from "@ember/controller";
+import { action } from "@ember/object";
+import { tracked } from "@glimmer/tracking";
+
+export default class extends Controller {
+  @tracked status = "";
+
+  queryParams = ["status"];
+
+  get queryString() {
+    let paramStrings = [];
+
+    this.queryParams.forEach((key) => {
+      if (this[key]) {
+        paramStrings.push(`${key}:${this[key]}`);
+      }
+    });
+
+    return paramStrings.join(" ");
+  }
+
+  @action
+  updateTopicsListQueryParams(queryString) {
+    for (const match of queryString.matchAll(/(\w+):([^:\s]+)/g)) {
+      const key = match[1];
+      const value = match[2];
+
+      if (this.queryParams.includes(key)) {
+        this.set(key, value);
+      }
+    }
+  }
+}

app/assets/javascripts/discourse/app/controllers/discovery-sortable.js

@@ -1,6 +1,4 @@
 import Controller, { inject as controller } from "@ember/controller";
-import discourseComputed from "discourse-common/utils/decorators";
-import { action } from "@ember/object";
 
 // Just add query params here to have them automatically passed to topic list filters.
 export const queryParams = {
@@ -29,31 +27,6 @@ export const queryParams = {
 const controllerOpts = {
   discoveryTopics: controller("discovery/topics"),
   queryParams: Object.keys(queryParams),
-
-  @discourseComputed(...Object.keys(queryParams))
-  queryString() {
-    let paramStrings = [];
-
-    this.queryParams.forEach((key) => {
-      if (this[key]) {
-        paramStrings.push(`${key}:${this[key]}`);
-      }
-    });
-
-    return paramStrings.join(" ");
-  },
-
-  @action
-  updateTopicsListQueryParams(queryString) {
-    for (const match of queryString.matchAll(/(\w+):([^:\s]+)/g)) {
-      const key = match[1];
-      const value = match[2];
-
-      if (controllerOpts.queryParams.includes(key)) {
-        this.set(key, value);
-      }
-    }
-  },
 };
 
 // Default to `undefined`

app/assets/javascripts/discourse/app/controllers/navigation/default.js

@@ -6,7 +6,6 @@ import { TRACKED_QUERY_PARAM_VALUE } from "discourse/lib/topic-list-tracked-filt
 
 export default Controller.extend(FilterModeMixin, {
   discovery: controller(),
-  discoveryFilter: controller("discovery.filter"),
   router: service(),
 
   @discourseComputed("router.currentRoute.queryParams.f")

app/assets/javascripts/discourse/app/controllers/navigation/filter.js

@@ -0,0 +1,12 @@
+import Controller, { inject as controller } from "@ember/controller";
+
+export default class extends Controller {
+  @controller("discovery/filter") discoveryFilter;
+
+  queryString = "";
+
+  constructor() {
+    super(...arguments);
+    this.queryString = this.discoveryFilter.queryString;
+  }
+}

app/assets/javascripts/discourse/app/pre-initializers/dynamic-route-builders.js

@@ -11,13 +11,6 @@ export default {
   name: "dynamic-route-builders",
 
   initialize(_container, app) {
-    app.register(
-      "controller:discovery.filter",
-      DiscoverySortableController.extend()
-    );
-
-    app.register("route:discovery.filter", buildTopicRoute("filter"));
-
     app.register(
       "controller:discovery.category",
       DiscoverySortableController.extend()

app/assets/javascripts/discourse/app/routes/discovery-filter.js

@@ -0,0 +1,53 @@
+import I18n from "I18n";
+
+import DiscourseRoute from "discourse/routes/discourse";
+import { isEmpty } from "@ember/utils";
+import { action } from "@ember/object";
+
+export default class extends DiscourseRoute {
+  queryParams = {
+    status: { replace: true, refreshModel: true },
+  };
+
+  model(data) {
+    return this.store.findFiltered("topicList", {
+      filter: "filter",
+      params: this.#filterQueryParams(data),
+    });
+  }
+
+  titleToken() {
+    const filterText = I18n.t("filters.filter.title");
+    return I18n.t("filters.with_topics", { filter: filterText });
+  }
+
+  setupController(_controller, model) {
+    this.controllerFor("discovery/topics").setProperties({ model });
+  }
+
+  renderTemplate() {
+    this.render("navigation/filter", { outlet: "navigation-bar" });
+
+    this.render("discovery/topics", {
+      controller: "discovery/topics",
+      outlet: "list-container",
+    });
+  }
+
+  // TODO(tgxworld): This action is required by the `discovery/topics` controller which is not necessary for this route.
+  // Figure out a way to remove this.
+  @action
+  changeSort() {}
+
+  #filterQueryParams(data) {
+    const params = {};
+
+    Object.keys(this.queryParams).forEach((key) => {
+      if (!isEmpty(data[key])) {
+        params[key] = data[key];
+      }
+    });
+
+    return params;
+  }
+}

app/assets/javascripts/discourse/app/templates/navigation/default.hbs

@@ -9,7 +9,5 @@
     @hasDraft={{this.currentUser.has_topic_draft}}
     @createTopic={{route-action "createTopic"}}
     @skipCategoriesNavItem={{this.skipCategoriesNavItem}}
-    @filterQueryString={{this.discoveryFilter.queryString}}
-    @updateTopicsListQueryParams={{this.discoveryFilter.updateTopicsListQueryParams}}
   />
 </DSection>

app/assets/javascripts/discourse/app/templates/navigation/filter.hbs

@@ -0,0 +1,20 @@
+<DSection
+  @bodyClass="navigation-filter"
+  @class="navigation-container"
+  @scrollTop={{false}}
+>
+  <div class="topic-query-filter">
+    <div class="topic-query-filter__input">
+      {{d-icon "filter" class="topic-query-filter__icon"}}
+      <Input
+        class="topic-query-filter__filter-term"
+        @value={{this.queryString}}
+        @enter={{action
+          this.discoveryFilter.updateTopicsListQueryParams
+          this.queryString
+        }}
+        @type="text"
+      />
+    </div>
+  </div>
+</DSection>