feat(core): improve the mechanism to change tab

We no longer scrape the DOM to get the available views and switch between them. Instead, we rely on
the native javascript objects offered by Home Assistant. This method is more reliable and allow us
to switch view even when tabs are not visible in the UI, e.g. when inside a subview.

Ref. #68

src/configManager.ts

@@ -1,5 +1,5 @@
 import { Config } from "./config";
-import { Lovelace, LovelaceConfig, PanelLovelace } from "./ha/data/lovelace";
+import { Lovelace, LovelaceConfig, LovelaceViewConfig, PanelLovelace } from "./ha/data/lovelace";
 import { Logger } from "./logger";
 import { LOG_TAG } from "./loggerUtils";
 import { PageObjectManager } from "./pageObjectManager";
@@ -18,12 +18,72 @@ export interface LovelaceConfigCustom extends LovelaceConfig {
 
 class ConfigManager {
   private static currentConfig: Config = new Config();
+  private static panel: string | null = null;
+  private static views: LovelaceViewConfig[] | null = null;
+  private static currentUserId: string | null = null;
+
   private static rawConfig: unknown | null = null;
   private static configObservers: ConfigObserver[] = [];
 
-  public static current(): Config {
+  public static getCurrentConfig(): Config {
     return ConfigManager.currentConfig;
   }
+  public static getPanel(): string | null {
+    return ConfigManager.panel;
+  }
+  public static getViews(): LovelaceViewConfig[] | null {
+    return ConfigManager.views;
+  }
+  public static getCurrentViewName(): string | null {
+    const haPanelLovelace: (HTMLElement & PanelLovelaceCustom) | null = PageObjectManager.haPanelLovelace.getDomNode();
+    return haPanelLovelace?.route?.path?.replace("/", "") ?? null;
+  }
+  public static getCurrentViewIndex(): number | null {
+    const views = ConfigManager.views;
+    const currentViewName = ConfigManager.getCurrentViewName();
+
+    if (views == null || currentViewName == null) {
+      return null;
+    }
+
+    for (let i = 0; i < views.length; i++) {
+      if (views[i].path == null && String(i) == currentViewName) {
+        // If this view has no path, Home Assistant uses its index in the URL
+        return i;
+      }
+      if (views[i].path == currentViewName) {
+        return i;
+      }
+    }
+
+    return null;
+  }
+  public static isViewVisible(views:LovelaceViewConfig[], index: number): boolean {
+    const visibleOrEnabledUsers = views[index].visible;
+
+    if (visibleOrEnabledUsers == null || visibleOrEnabledUsers == true) {
+      return true;
+    }
+    if (visibleOrEnabledUsers == false) {
+      return false;
+    }
+
+    if (visibleOrEnabledUsers instanceof Array) {
+      for(const enabledUser of visibleOrEnabledUsers) {
+        if (enabledUser.user == ConfigManager.currentUserId) {
+          return true;
+        }
+      }
+      return false;
+    }
+
+    const exhaustiveCheck: never = visibleOrEnabledUsers;
+    throw new Error(`Unhandled case: ${exhaustiveCheck}`);
+  }
+
+  public static isViewHidden(views:LovelaceViewConfig[], index: number): boolean {
+    return !ConfigManager.isViewVisible(views, index);
+  }
 
   public static async readAndMonitorConfig() {
     // When changing dashboards and when updating the config via the UI, the hui-root element is
@@ -54,12 +114,24 @@ class ConfigManager {
     const haPanelLovelace: (HTMLElement & PanelLovelaceCustom) | null = PageObjectManager.haPanelLovelace.getDomNode();
 
     const rawConfig = haPanelLovelace?.lovelace?.config?.swipe_nav ?? {};
-    // TODO const views = haPanelLovelace?.lovelace?.config?.views ?? [];
-    // TODO const currentView = haPanelLovelace?.route?.path;
-
     if (JSON.stringify(rawConfig) != JSON.stringify(ConfigManager.rawConfig)) {
       ConfigManager.saveConfig(rawConfig);
     }
+
+    const panel = haPanelLovelace?.route?.prefix;
+    if (panel != null) {
+      ConfigManager.panel = panel.replace("/", "");
+    }
+
+    const views = haPanelLovelace?.lovelace?.config?.views;
+    if (views != null) {
+      ConfigManager.views = views;
+    }
+
+    const currentUserId = haPanelLovelace?.hass?.user?.id;
+    if (currentUserId != null) {
+      ConfigManager.currentUserId = currentUserId;
+    }
   }
 
   private static saveConfig(rawConfig: unknown) {

src/main.ts

@@ -10,9 +10,9 @@ console.info("%c↔️ Swipe navigation ↔️ - VERSION_PLACEHOLDER", "color: #
 
 async function run() {
 
-  Logger.setLoggerLevel(ConfigManager.current().getLoggerLevel());
+  Logger.setLoggerLevel(ConfigManager.getCurrentConfig().getLoggerLevel());
   ConfigManager.registerConfigObserver(new ConfigObserver(() => {
-    Logger.setLoggerLevel(ConfigManager.current().getLoggerLevel());
+    Logger.setLoggerLevel(ConfigManager.getCurrentConfig().getLoggerLevel());
     Logger.logi(LOG_TAG, "New configuration loaded.");
   }));