From 873a0209592090e84799f45dcb14b3c5a7f2189d Mon Sep 17 00:00:00 2001
From: Ilia Mashkov <hikkikomori7@gmail.com>
Date: Thu, 1 Jan 2026 15:48:45 +0300
Subject: [PATCH] feature(createFilterStore): create fiter store generator

---
 src/shared/store/createFilterStore.ts | 189 ++++++++++++++++++++++++++
 1 file changed, 189 insertions(+)
 create mode 100644 src/shared/store/createFilterStore.ts

diff --git a/src/shared/store/createFilterStore.ts b/src/shared/store/createFilterStore.ts
new file mode 100644
index 0000000..b632f53
--- /dev/null
+++ b/src/shared/store/createFilterStore.ts
@@ -0,0 +1,189 @@
+import { derived, Readable, Writable, writable } from 'svelte/store';
+
+export interface Category {
+    /**
+     * Category identifier
+     */
+    id: string;
+    /**
+     * Category name
+     */
+    name: string;
+    /**
+     * Category selected state
+     */
+    selected: boolean;
+}
+
+export interface FilterModel {
+    /**
+     * Search query
+     */
+    searchQuery?: string;
+    /**
+     * Categories
+     */
+    categories: Category[];
+}
+
+/**
+ * Model for reusable filter store with search support and category selection
+ */
+export interface FilterStore<T extends FilterModel> extends Writable<T> {
+    /**
+     * Get the store.
+     * @returns Readable store with filter data
+     */
+    getStore: () => Readable<T>;
+    /**
+     * Get the selected categories.
+     * @returns Readable store with selected categories
+     */
+    getSelectedCategories: () => Readable<Category[]>;
+    /**
+     * Get the filtered categories.
+     * @returns Readable store with filtered categories
+     */
+    getFilteredCategories: () => Readable<Category[]>;
+    /**
+     * Update the search query filter.
+     *
+     * @param searchQuery - Search text (undefined to clear)
+     */
+    setSearchQuery: (searchQuery: string | undefined) => void;
+    /**
+     * Clear the search query filter.
+     */
+    clearSearchQuery: () => void;
+    /**
+     * Select a category.
+     *
+     * @param category - Category to select
+     */
+    selectCategory: (categoryId: string) => void;
+    /**
+     * Deselect a category.
+     *
+     * @param category - Category to deselect
+     */
+    deselectCategory: (categoryId: string) => void;
+    /**
+     * Select all categories.
+     */
+    selectAllCategories: () => void;
+    /**
+     * Deselect all categories.
+     */
+    deselectAllCategories: () => void;
+}
+
+/**
+ * Create a filter store.
+ * @param initialState - Initial state of the filter store
+ * @returns FilterStore<T>
+ */
+export function createFilterStore<T extends FilterModel>(
+    initialState: T,
+): FilterStore<T> {
+    const { subscribe, set, update } = writable<T>(initialState);
+
+    return {
+        /*
+         * Expose subscribe, set, and update from Writable.
+         * This makes FilterStore compatible with Writable interface.
+         */
+        subscribe,
+        set,
+        update,
+        /**
+         * Get the current state of the filter store.
+         */
+        getStore: () => {
+            return {
+                subscribe,
+            };
+        },
+        /**
+         * Get the selected categories.
+         */
+        getSelectedCategories: () => {
+            return derived({ subscribe }, $store => {
+                return $store.categories.filter(category => category.selected);
+            });
+        },
+        /**
+         * Get the filtered categories.
+         */
+        getFilteredCategories: () => {
+            return derived({ subscribe }, $store => {
+                return $store.categories.filter(category =>
+                    category.name.includes($store.searchQuery || '')
+                );
+            });
+        },
+        /**
+         * Update the search query filter.
+         *
+         * @param searchQuery - Search text (undefined to clear)
+         */
+        setSearchQuery: (searchQuery: string | undefined) => {
+            update(state => ({
+                ...state,
+                searchQuery: searchQuery || undefined,
+            }));
+        },
+        /**
+         * Clear the search query filter.
+         */
+        clearSearchQuery: () => {
+            update(state => ({
+                ...state,
+                searchQuery: undefined,
+            }));
+        },
+        /**
+         * Select a category.
+         *
+         * @param categoryId - Category ID
+         */
+        selectCategory: (categoryId: string) => {
+            update(state => ({
+                ...state,
+                categories: state.categories.map(c =>
+                    c.id === categoryId ? { ...c, selected: true } : c
+                ),
+            }));
+        },
+        /**
+         * Deselect a category.
+         *
+         * @param categoryId - Category ID
+         */
+        deselectCategory: (categoryId: string) => {
+            update(state => ({
+                ...state,
+                categories: state.categories.map(c =>
+                    c.id === categoryId ? { ...c, selected: false } : c
+                ),
+            }));
+        },
+        /**
+         * Select all categories
+         */
+        selectAllCategories: () => {
+            update(state => ({
+                ...state,
+                categories: state.categories.map(c => ({ ...c, selected: true })),
+            }));
+        },
+        /**
+         * Deselect all categories
+         */
+        deselectAllCategories: () => {
+            update(state => ({
+                ...state,
+                categories: state.categories.map(c => ({ ...c, selected: false })),
+            }));
+        },
+    };
+}