(feat:background) Create stores for supported games & Create a React hook for fetching the background

src/backend/stores/mihoyo.ts

@@ -1,28 +1,103 @@
+import { useEffect, useState } from "preact/hooks";
+
 import { create } from "zustand";
 import { persist, createJSONStorage } from "zustand/middleware";
 
 import { invoke } from "@tauri-apps/api";
+import { exists } from "@tauri-apps/api/fs";
+import { convertFileSrc } from "@tauri-apps/api/tauri";
 
-export type GenshinStore = {
+import { LauncherResponse, StoreWrite } from "@backend/types.ts";
+import { AppDataPath, LauncherUrls } from "@app/constants.ts";
+
+export type GameDataStore = {
     backgroundHash: string;
+
+    fetchLatestBackground: () => Promise<void>;
 };
 
-export const useGenshinStore = create(
+export const useGenshinStore = create<GameDataStore>()(
     persist(
-        (): GenshinStore => ({
-            backgroundHash: ""
+        (set): GameDataStore => ({
+            backgroundHash: "",
+            fetchLatestBackground: () => fetchLatestBackground(
+                set as StoreWrite, LauncherUrls.GENSHIN_IMPACT)
         }),
         {
-            name: "genshin",
+            name: "genshin_data",
+            storage: createJSONStorage(() => localStorage)
+        }
+    )
+);
+
+export const useStarRailStore = create<GameDataStore>()(
+    persist(
+        (set) => ({
+            backgroundHash: "",
+            fetchLatestBackground: () => fetchLatestBackground(
+                set as StoreWrite, LauncherUrls.STAR_RAIL)
+        }),
+        {
+            name: "starrail_data",
             storage: createJSONStorage(() => localStorage)
         }
     )
 );
 
+/**
+ * Fetches the latest background image.
+ *
+ * @param set The store write function.
+ * @param serviceUrl The URL used for fetching the background.
+ */
+export async function fetchLatestBackground(set: StoreWrite, serviceUrl: string): Promise<void> {
+    // Fetch the launcher data.
+    const launcherData = await fetch(serviceUrl, { cache: "force-cache" });
+    const responseData = await launcherData.json() as LauncherResponse;
+
+    // Check if the background exists on the system.
+    const backgroundUrl = responseData.data.adv.background;
+    const backgroundHash = backgroundUrl.split("/").pop()?.substring(0, 32);
+    if (backgroundHash == undefined) throw new Error("Unable to find the hash of the background.");
+
+    // Check if the file exists on the system.
+    const filePath = `${AppDataPath}/bg/${backgroundHash}.png`;
+    if (!await exists(filePath)) {
+        // Download the image.
+        await invoke("download_file", {
+            url: backgroundUrl, toFile: filePath
+        });
+
+        // Update the store.
+        set({ backgroundHash });
+    }
+}
+
+/**
+ * Attempts to get the file of the background.
+ *
+ * @param hash The hash of the background.
+ */
+export async function getBackgroundFile(hash: string): Promise<string> {
+    return convertFileSrc(`${AppDataPath}/bg/${hash}.png`);
+}
+
 /**
  * React hook which returns the URL of the locally cached background image.
  */
 export function useBackground() {
-    const { backgroundHash } = useGenshinStore();
+    const { backgroundHash, fetchLatestBackground } = useGenshinStore();
     const [background, setBackground] = useState<string | null>(null);
+
+    useEffect(() => {
+        (async () => {
+            if (backgroundHash != "") {
+                setBackground(await getBackgroundFile(backgroundHash));
+            } else {
+                fetchLatestBackground();
+            }
+        })();
+    }, [backgroundHash, fetchLatestBackground]);
+
+    return background;
 }