src/entities/Font/lib/helpers/createFontCollection.svelte.ts

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+/**
+ * Font collection store
+ *
+ * Main font collection cache using Svelte stores.
+ * Integrates with TanStack Query for advanced caching and deduplication.
+ *
+ * Provides derived stores for filtered/sorted fonts.
+ */
+
+import type {
+    FontCollectionFilters,
+    FontCollectionSort,
+    FontCollectionState,
+    UnifiedFont,
+} from '$entities/Font/model/types';
+import { createCollectionCache } from '$shared/lib/fetch/collectionCache';
+
+export const DEFAULT_SORT: FontCollectionSort = { field: 'name', direction: 'asc' };
+
+/**
+ * Create font collection store
+ *
+ * @param initialState - Initial state for collection
+ * @returns Font collection store instance
+ *
+ * @example
+ * ```ts
+ * const fontCollection = createFontCollectionStore({
+ *     fonts: {},
+ *     filters: {},
+ *     sort: { field: 'name', direction: 'asc' }
+ * });
+ *
+ * // Add fonts to collection
+ * fontCollection.addFonts([font1, font2]);
+ *
+ * // Use in component
+ * $fontCollection.filteredFonts
+ * ```
+ */
+export function createFontCollection(
+    initialState?: Partial<FontCollectionState>,
+) {
+    const cache = createCollectionCache<UnifiedFont>({
+        defaultTTL: 5 * 60 * 1000, // 5 minutes
+        maxSize: 1000,
+    });
+
+    let fonts = $state(initialState?.fonts ?? {});
+    let filters = $state<FontCollectionFilters>(initialState?.filters ?? { searchQuery: '' });
+    let sort = $state<FontCollectionSort>(initialState?.sort ?? DEFAULT_SORT);
+
+    // const state: Writable<FontCollectionState> = writable({
+    //     ...defaultState,
+    //     ...initialState,
+    // });
+
+    // const isLoading = writable(false);
+    let isLoading = $state<boolean>(false);
+    // const error = writable<string | undefined>();
+    let error = $state<string | undefined>();
+
+    // Derived store for fonts as array
+    // const fonts = derived(state, $state => {
+    //     return Object.values($state.fonts);
+    // });
+    //
+
+    const filtrationArray = $derived([
+        (font: UnifiedFont) => filters.providers?.includes(font.provider),
+        (font: UnifiedFont) => filters.categories?.includes(font.category),
+        (font: UnifiedFont) => filters.subsets?.some(subset => font.subsets.includes(subset)),
+        (font: UnifiedFont) =>
+            filters.searchQuery
+                ? font.name.toLowerCase().includes(filters.searchQuery.toLowerCase())
+                : true,
+    ]);
+
+    const filteredFonts = $derived(
+        Object.values(fonts).filter(font => {
+            return filtrationArray.every(filter => filter(font));
+        }),
+    );
+
+    // Derived store for filtered fonts
+    // const filteredFonts = derived([state, fonts], ([$state, $fonts]) => {
+    //     let filtered = [...$fonts];
+
+    //     // Apply search filter
+    //     if ($state.filters.searchQuery) {
+    //         const query = $state.filters.searchQuery.toLowerCase();
+    //         filtered = filtered.filter(font => font.name.toLowerCase().includes(query));
+    //     }
+
+    //     // Apply provider filter
+    //     if ($state.filters.provider) {
+    //         filtered = filtered.filter(
+    //             font => font.provider === $state.filters.provider,
+    //         );
+    //     }
+
+    //     // Apply category filter
+    //     if ($state.filters.category) {
+    //         filtered = filtered.filter(
+    //             font => font.category === $state.filters.category,
+    //         );
+    //     }
+
+    //     // Apply subset filter
+    //     if ($state.filters.subsets?.length) {
+    //         filtered = filtered.filter(font =>
+    //             $state.filters.subsets!.some(subset => font.subsets.includes(subset as FontSubset))
+    //         );
+    //     }
+
+    //     // Apply sort
+    //     const { field, direction } = $state.sort;
+    //     const multiplier = direction === 'asc' ? 1 : -1;
+
+    //     filtered.sort((a, b) => {
+    //         let comparison = 0;
+
+    //         if (field === 'name') {
+    //             comparison = a.name.localeCompare(b.name);
+    //         } else if (field === 'popularity') {
+    //             const aPop = a.metadata.popularity ?? 0;
+    //             const bPop = b.metadata.popularity ?? 0;
+    //             comparison = aPop - bPop;
+    //         } else if (field === 'category') {
+    //             comparison = a.category.localeCompare(b.category);
+    //         }
+
+    //         return comparison * multiplier;
+    //     });
+
+    //     return filtered;
+    // });
+
+    // Derived store for count
+    // const count = derived(fonts, $fonts => $fonts.length);
+
+    const count = $derived(fonts.size);
+
+    return {
+        get fonts() {
+            return fonts;
+        },
+        set fonts(newFonts) {
+            fonts = newFonts;
+        },
+        get filteredFonts() {
+            return filteredFonts;
+        },
+        get filters() {
+            return filters;
+        },
+        set filters(newFilters) {
+            filters = newFilters;
+        },
+        get searchQuery() {
+            return filters.searchQuery;
+        },
+        set searchQuery(newSearchQuery) {
+            filters = {
+                ...filters,
+                searchQuery: newSearchQuery,
+            };
+        },
+        get sort() {
+            return sort;
+        },
+        set sort(newSort) {
+            sort = newSort;
+        },
+        get count() {
+            return count;
+        },
+        get isLoading() {
+            return isLoading;
+        },
+        set isLoading(value) {
+            isLoading = value;
+        },
+        get error() {
+            return error;
+        },
+        set error(value) {
+            error = value;
+        },
+        addFonts(newFonts: UnifiedFont[]) {
+            fonts = newFonts.reduce((acc, font) => {
+                cache.set(font.id, font);
+                return { ...acc, [font.id]: font };
+            }, fonts);
+        },
+        addFont(font: UnifiedFont) {
+            cache.set(font.id, font);
+            fonts = Object.fromEntries(Object.entries(fonts).concat([[font.id, font]]));
+        },
+        removeFont(fontId: string) {
+            cache.remove(fontId);
+            fonts = Object.fromEntries(Object.entries(fonts).filter(([id]) => id !== fontId));
+        },
+        clearFonts() {
+            fonts = {};
+            cache.clear();
+        },
+        clearFilters() {
+            filters = {
+                searchQuery: '',
+                providers: [],
+                categories: [],
+            };
+        },
+        clearSort() {
+            sort = DEFAULT_SORT;
+        },
+        getFontById(fontId: string) {
+            return fonts[fontId];
+        },
+    };
+}
+
+export type FontCollectionStore = ReturnType<typeof createFontCollection>;

src/entities/Font/model/store/fontCollection.svelte.ts

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+import { createFontCollection } from '../../lib';
+
+export const fontCollection = createFontCollection();