From a29b80efbbeb03f5da20672d0d54c72be5e75594 Mon Sep 17 00:00:00 2001
From: Ilia Mashkov <hikkikomori7@gmail.com>
Date: Tue, 13 Jan 2026 20:02:20 +0300
Subject: [PATCH] feature: Create BaseFontStore class with Tanstack query logic
 and FontshareStore, GoogleFontsStore based on it

---
 .../Font/model/store/baseFontStore.svelte.ts  | 156 ++++++++++++++++++
 .../Font/model/store/fontshareStore.svelte.ts |  32 ++++
 .../model/store/googleFontsStore.svelte.ts    |  27 +++
 3 files changed, 215 insertions(+)
 create mode 100644 src/entities/Font/model/store/baseFontStore.svelte.ts
 create mode 100644 src/entities/Font/model/store/fontshareStore.svelte.ts
 create mode 100644 src/entities/Font/model/store/googleFontsStore.svelte.ts

diff --git a/src/entities/Font/model/store/baseFontStore.svelte.ts b/src/entities/Font/model/store/baseFontStore.svelte.ts
new file mode 100644
index 0000000..d9ffd12
--- /dev/null
+++ b/src/entities/Font/model/store/baseFontStore.svelte.ts
@@ -0,0 +1,156 @@
+import { queryClient } from '$shared/api/queryClient';
+import {
+    type QueryKey,
+    QueryObserver,
+    type QueryObserverOptions,
+    type QueryObserverResult,
+} from '@tanstack/query-core';
+import type { UnifiedFont } from '../types';
+
+/** */
+export abstract class BaseFontStore<TParams extends Record<string, any>> {
+    // params = $state<TParams>({} as TParams);
+    cleanup: () => void;
+
+    #bindings = $state<(() => Partial<TParams>)[]>([]);
+    #internalParams = $state<TParams>({} as TParams);
+
+    params = $derived.by(() => {
+        let merged = { ...this.#internalParams };
+
+        // Loop through every "Cable" plugged into the store
+        for (const getter of this.#bindings) {
+            merged = { ...merged, ...getter() };
+        }
+
+        return merged as TParams;
+    });
+
+    protected result = $state<QueryObserverResult<UnifiedFont[], Error>>({} as any);
+    protected observer: QueryObserver<UnifiedFont[], Error>;
+    protected qc = queryClient;
+
+    constructor(initialParams: TParams) {
+        this.#internalParams = initialParams;
+
+        this.observer = new QueryObserver(this.qc, this.getOptions());
+
+        // Sync TanStack -> Svelte State
+        this.observer.subscribe(r => {
+            this.result = r;
+        });
+
+        // Sync Svelte State -> TanStack Options
+        this.cleanup = $effect.root(() => {
+            $effect(() => {
+                this.observer.setOptions(this.getOptions());
+            });
+        });
+    }
+
+    /**
+     * Mandatory: Child must define how to fetch data and what the key is.
+     */
+    protected abstract getQueryKey(params: TParams): QueryKey;
+    protected abstract fetchFn(params: TParams): Promise<UnifiedFont[]>;
+
+    private getOptions(params = this.params): QueryObserverOptions<UnifiedFont[], Error> {
+        return {
+            queryKey: this.getQueryKey(params),
+            queryFn: () => this.fetchFn(params),
+            staleTime: 5 * 60 * 1000,
+        };
+    }
+
+    // --- Common Getters ---
+    get fonts() {
+        return this.result.data ?? [];
+    }
+    get isLoading() {
+        return this.result.isLoading;
+    }
+    get isFetching() {
+        return this.result.isFetching;
+    }
+    get isError() {
+        return this.result.isError;
+    }
+    get isEmpty() {
+        return !this.isLoading && this.fonts.length === 0;
+    }
+
+    // --- Common Actions ---
+
+    addBinding(getter: () => Partial<TParams>) {
+        this.#bindings.push(getter);
+
+        return () => {
+            this.#bindings = this.#bindings.filter(b => b !== getter);
+        };
+    }
+
+    setParams(newParams: Partial<TParams>) {
+        this.#internalParams = { ...this.params, ...newParams };
+    }
+    /**
+     * Invalidate cache and refetch
+     */
+    invalidate() {
+        this.qc.invalidateQueries({ queryKey: this.getQueryKey(this.params) });
+    }
+
+    destroy() {
+        this.cleanup();
+    }
+
+    /**
+     * Manually refetch
+     */
+    async refetch() {
+        await this.observer.refetch();
+    }
+
+    /**
+     * Prefetch with different params (for hover states, pagination, etc.)
+     */
+    async prefetch(params: TParams) {
+        await this.qc.prefetchQuery(this.getOptions(params));
+    }
+
+    /**
+     * Cancel ongoing queries
+     */
+    cancel() {
+        this.qc.cancelQueries({
+            queryKey: this.getQueryKey(this.params),
+        });
+    }
+
+    /**
+     * Clear cache for current params
+     */
+    clearCache() {
+        this.qc.removeQueries({
+            queryKey: this.getQueryKey(this.params),
+        });
+    }
+
+    /**
+     * Get cached data without triggering fetch
+     */
+    getCachedData() {
+        return this.qc.getQueryData<UnifiedFont[]>(
+            this.getQueryKey(this.params),
+        );
+    }
+
+    /**
+     * Set data manually (optimistic updates)
+     */
+    setQueryData(updater: (old: UnifiedFont[] | undefined) => UnifiedFont[]) {
+        this.qc.setQueryData(
+            this.getQueryKey(this.params),
+            updater,
+        );
+    }
+}
diff --git a/src/entities/Font/model/store/fontshareStore.svelte.ts b/src/entities/Font/model/store/fontshareStore.svelte.ts
new file mode 100644
index 0000000..cec798d
--- /dev/null
+++ b/src/entities/Font/model/store/fontshareStore.svelte.ts
@@ -0,0 +1,32 @@
+import type { FontshareParams } from '../../api';
+import { fetchFontshareFontsQuery } from '../services';
+import type { UnifiedFont } from '../types';
+import { BaseFontStore } from './baseFontStore.svelte';
+
+/**
+ * Fontshare store wrapping TanStack Query with runes
+ */
+export class FontshareStore extends BaseFontStore<FontshareParams> {
+    constructor(initialParams: FontshareParams = {}) {
+        super(initialParams);
+    }
+
+    protected getQueryKey(params: FontshareParams) {
+        return ['fontshare', params] as const;
+    }
+
+    protected async fetchFn(params: FontshareParams): Promise<UnifiedFont[]> {
+        return fetchFontshareFontsQuery(params);
+    }
+
+    // Provider-specific methods (shortcuts)
+    setSearch(search: string) {
+        this.setParams({ q: search } as any);
+    }
+}
+
+export function createFontshareStore(params: FontshareParams = {}) {
+    return new FontshareStore(params);
+}
+
+export const fontshareStore = new FontshareStore();
diff --git a/src/entities/Font/model/store/googleFontsStore.svelte.ts b/src/entities/Font/model/store/googleFontsStore.svelte.ts
new file mode 100644
index 0000000..428c476
--- /dev/null
+++ b/src/entities/Font/model/store/googleFontsStore.svelte.ts
@@ -0,0 +1,27 @@
+import type { GoogleFontsParams } from '../../api';
+import { fetchGoogleFontsQuery } from '../services';
+import type { UnifiedFont } from '../types';
+import { BaseFontStore } from './baseFontStore.svelte';
+
+/**
+ * Google Fonts store wrapping TanStack Query with runes
+ */
+export class GoogleFontsStore extends BaseFontStore<GoogleFontsParams> {
+    constructor(initialParams: GoogleFontsParams = {}) {
+        super(initialParams);
+    }
+
+    protected getQueryKey(params: GoogleFontsParams) {
+        return ['googleFonts', params] as const;
+    }
+
+    protected async fetchFn(params: GoogleFontsParams): Promise<UnifiedFont[]> {
+        return fetchGoogleFontsQuery(params);
+    }
+}
+
+export function createFontshareStore(params: GoogleFontsParams = {}) {
+    return new GoogleFontsStore(params);
+}
+
+export const googleFontsStore = new GoogleFontsStore();