I've added JSDoc comments to interface hooks and utils.

This change introduces JSDoc-style comments to several TypeScript files within your `src/interface` directory to improve code understanding and maintainability, focusing on hooks and utility functions.

- `src/interface/hooks/BackgroundDataLoader.ts`: I added comments to all exported functions and the `BackgroundDB` interface, detailing IndexedDB interactions for background image storage.
- `src/interface/hooks/SettingsPopup.ts`: I documented the public methods of the `SettingsPopup` singleton, which handles event notifications for settings popup closures.
- `src/interface/utils/themeImageHandlers.ts`: I added comments to all exported functions, explaining their roles in managing images within custom themes (uploading, removing, etc.).
- `src/interface/hooks/BackgroundUpdates.ts`: I documented the `BackgroundUpdates` singleton class and its methods, used for broadcasting generic background update events.
- `src/interface/hooks/ThemeUpdates.ts`: I documented the `ThemeUpdates` singleton class and its methods, responsible for broadcasting theme-related update events.

src/interface/hooks/BackgroundDataLoader.ts

@@ -1,8 +1,20 @@
 import { type DBSchema, type IDBPDatabase, openDB } from "idb";
 
+/**
+ * Defines the schema for the IndexedDB database used for storing background image data.
+ *
+ * @interface BackgroundDB
+ * @extends {DBSchema}
+ * @property {object} backgrounds - The object store for background images.
+ * @property {string} backgrounds.key - The type of the key for the object store (in this case, it's `id` as defined in `keyPath`).
+ * @property {object} backgrounds.value - The structure of the objects stored.
+ * @property {string} backgrounds.value.id - The unique identifier for the background image record.
+ * @property {string} backgrounds.value.type - The MIME type of the image (e.g., "image/png", "image/jpeg").
+ * @property {Blob} backgrounds.value.blob - The binary large object (Blob) containing the image data.
+ */
 interface BackgroundDB extends DBSchema {
   backgrounds: {
-    key: string;
+    key: string; // Corresponds to the 'id' property due to keyPath: "id"
     value: {
       id: string;
       type: string;
@@ -13,6 +25,14 @@ interface BackgroundDB extends DBSchema {
 
 let db: IDBPDatabase<BackgroundDB> | null = null;
 
+/**
+ * Initializes and opens an IndexedDB connection or returns an existing one.
+ * If the database doesn't exist or needs an upgrade, the `upgrade` callback
+ * creates the 'backgrounds' object store with 'id' as the keyPath.
+ *
+ * @async
+ * @returns {Promise<IDBPDatabase<BackgroundDB>>} A promise that resolves with the database instance.
+ */
 export async function openDatabase(): Promise<IDBPDatabase<BackgroundDB>> {
   if (db) return db;
 
@@ -25,6 +45,12 @@ export async function openDatabase(): Promise<IDBPDatabase<BackgroundDB>> {
   return db;
 }
 
+/**
+ * Retrieves all background image records from the 'backgrounds' object store in IndexedDB.
+ *
+ * @async
+ * @returns {Promise<Array<{id: string, type: string, blob: Blob}>>} A promise that resolves with an array of all background image records.
+ */
 export async function readAllData(): Promise<
   Array<{ id: string; type: string; blob: Blob }>
 > {
@@ -32,6 +58,16 @@ export async function readAllData(): Promise<
   return db.getAll("backgrounds");
 }
 
+/**
+ * Writes or updates a background image record in the 'backgrounds' object store.
+ * If a record with the given `id` already exists, it will be updated. Otherwise, a new record is created.
+ *
+ * @async
+ * @param {string} id - The unique identifier for the background image record.
+ * @param {string} type - The MIME type of the image (e.g., "image/png").
+ * @param {Blob} blob - The Blob object containing the image data.
+ * @returns {Promise<void>} A promise that resolves when the data has been successfully written.
+ */
 export async function writeData(
   id: string,
   type: string,
@@ -41,16 +77,37 @@ export async function writeData(
   await db.put("backgrounds", { id, type, blob });
 }
 
+/**
+ * Deletes a background image record from the 'backgrounds' object store by its ID.
+ *
+ * @async
+ * @param {string} id - The unique identifier of the background image record to delete.
+ * @returns {Promise<void>} A promise that resolves when the data has been successfully deleted.
+ */
 export async function deleteData(id: string): Promise<void> {
   const db = await openDatabase();
   await db.delete("backgrounds", id);
 }
 
+/**
+ * Clears all records from the 'backgrounds' object store in IndexedDB.
+ *
+ * @async
+ * @returns {Promise<void>} A promise that resolves when all data has been successfully cleared.
+ */
 export async function clearAllData(): Promise<void> {
   const db = await openDatabase();
   await db.clear("backgrounds");
 }
 
+/**
+ * Retrieves a single background image record from the 'backgrounds' object store by its ID.
+ *
+ * @async
+ * @param {string} id - The unique identifier of the background image record to retrieve.
+ * @returns {Promise<{id: string, type: string, blob: Blob} | undefined>} A promise that resolves with the
+ *                                                                        background image record if found, or undefined otherwise.
+ */
 export async function getDataById(
   id: string,
 ): Promise<{ id: string; type: string; blob: Blob } | undefined> {
@@ -58,6 +115,10 @@ export async function getDataById(
   return db.get("backgrounds", id);
 }
 
+/**
+ * Closes the active IndexedDB connection and nullifies the global `db` variable.
+ * This is important to release resources and allow for proper database management.
+ */
 export function closeDatabase(): void {
   if (db) {
     db.close();
@@ -65,12 +126,24 @@ export function closeDatabase(): void {
   }
 }
 
-// Helper function to check if IndexedDB is supported
+/**
+ * Checks if IndexedDB is supported by the current browser environment.
+ *
+ * @returns {boolean} True if IndexedDB is supported, false otherwise.
+ */
 export function isIndexedDBSupported(): boolean {
   return "indexedDB" in window;
 }
 
-// Helper function to check if there's enough storage space
+/**
+ * Estimates available storage space and checks if it's sufficient for the specified `requiredSpace`.
+ * Uses the `navigator.storage.estimate()` API if available.
+ * If the API is not available or cannot determine space, it defaults to assuming enough space is available.
+ *
+ * @async
+ * @param {number} requiredSpace - The amount of storage space required, in bytes.
+ * @returns {Promise<boolean>} A promise that resolves with true if enough space is estimated to be available, false otherwise.
+ */
 export async function hasEnoughStorageSpace(
   requiredSpace: number,
 ): Promise<boolean> {

src/interface/hooks/BackgroundUpdates.ts

@@ -1,11 +1,21 @@
 type BackgroundUpdateCallback = () => void;
 
+/**
+ * A singleton class used to notify listeners about generic background updates or events.
+ * These updates typically signify that UI components or other parts of the application
+ * might need to refresh or re-evaluate background-related data (e.g., after a new background
+ * image is added, removed, or changed).
+ */
 class BackgroundUpdates {
   private static instance: BackgroundUpdates;
   private listeners: Set<BackgroundUpdateCallback> = new Set();
 
   private constructor() {}
 
+  /**
+   * Gets the singleton instance of the BackgroundUpdates class.
+   * @returns {BackgroundUpdates} The singleton instance.
+   */
   public static getInstance(): BackgroundUpdates {
     if (!BackgroundUpdates.instance) {
       BackgroundUpdates.instance = new BackgroundUpdates();
@@ -13,14 +23,31 @@ class BackgroundUpdates {
     return BackgroundUpdates.instance;
   }
 
+  /**
+   * Registers a callback function to be invoked when a background update is triggered.
+   *
+   * @param {BackgroundUpdateCallback} callback The function to call when a background update occurs.
+   *                                            This callback takes no arguments and returns void.
+   */
   public addListener(callback: BackgroundUpdateCallback): void {
     this.listeners.add(callback);
   }
 
+  /**
+   * Unregisters a previously added callback function.
+   * After calling this method, the provided callback will no longer be invoked when a background update is triggered.
+   *
+   * @param {BackgroundUpdateCallback} callback The callback function to remove from the listeners.
+   */
   public removeListener(callback: BackgroundUpdateCallback): void {
     this.listeners.delete(callback);
   }
 
+  /**
+   * Invokes all registered listener callbacks, signifying that a background update has occurred.
+   * This method should be called whenever a change to background data happens that requires
+   * other parts of the application to be notified.
+   */
   public triggerUpdate(): void {
     this.listeners.forEach((callback) => callback());
   }

src/interface/hooks/SettingsPopup.ts

@@ -21,14 +21,30 @@ class SettingsPopup {
     return SettingsPopup.instance;
   }
 
+  /**
+   * Registers a callback function to be invoked when the settings popup is closed.
+   *
+   * @param {SettingsPopupCallback} callback The function to call when the settings popup closes.
+   *                                         This callback takes no arguments and returns void.
+   */
   public addListener(callback: SettingsPopupCallback): void {
     this.listeners.add(callback);
   }
 
+  /**
+   * Unregisters a previously added callback function.
+   * After calling this method, the provided callback will no longer be invoked when the settings popup closes.
+   *
+   * @param {SettingsPopupCallback} callback The callback function to remove from the listeners.
+   */
   public removeListener(callback: SettingsPopupCallback): void {
     this.listeners.delete(callback);
   }
 
+  /**
+   * Invokes all registered listener callbacks.
+   * This method should be called when the settings popup is closed to notify all subscribed components or services.
+   */
   public triggerClose(): void {
     this.listeners.forEach((callback) => callback());
   }

src/interface/hooks/ThemeUpdates.ts

@@ -1,11 +1,21 @@
 type ThemeUpdateCallback = () => void;
 
+/**
+ * A singleton class used to notify listeners about theme-related updates.
+ * These updates can include events like theme changes, custom theme modifications,
+ * or any other event that might require UI components to refresh their appearance
+ * or re-apply theme styles.
+ */
 class ThemeUpdates {
   private static instance: ThemeUpdates;
   private listeners: Set<ThemeUpdateCallback> = new Set();
 
   private constructor() {}
 
+  /**
+   * Gets the singleton instance of the ThemeUpdates class.
+   * @returns {ThemeUpdates} The singleton instance.
+   */
   public static getInstance(): ThemeUpdates {
     if (!ThemeUpdates.instance) {
       ThemeUpdates.instance = new ThemeUpdates();
@@ -13,14 +23,31 @@ class ThemeUpdates {
     return ThemeUpdates.instance;
   }
 
+  /**
+   * Registers a callback function to be invoked when a theme update is triggered.
+   *
+   * @param {ThemeUpdateCallback} callback The function to call when a theme update occurs.
+   *                                       This callback takes no arguments and returns void.
+   */
   public addListener(callback: ThemeUpdateCallback): void {
     this.listeners.add(callback);
   }
 
+  /**
+   * Unregisters a previously added callback function.
+   * After calling this method, the provided callback will no longer be invoked when a theme update is triggered.
+   *
+   * @param {ThemeUpdateCallback} callback The callback function to remove from the listeners.
+   */
   public removeListener(callback: ThemeUpdateCallback): void {
     this.listeners.delete(callback);
   }
 
+  /**
+   * Invokes all registered listener callbacks, signifying that a theme-related update has occurred.
+   * This method should be called whenever a change related to themes happens that requires
+   * other parts of the application to be notified.
+   */
   public triggerUpdate(): void {
     this.listeners.forEach((callback) => callback());
   }