🎨 Save active contest type (#1845)

src/lib/components/TaskTables/TaskTable.svelte

@@ -16,6 +16,7 @@
 
   import TaskTableBodyCell from '$lib/components/TaskTables/TaskTableBodyCell.svelte';
 
+  import { activeContestTypeStore } from '$lib/stores/active_contest_type.svelte';
   import {
     contestTableProviders,
     type ContestTableProviders,
@@ -31,7 +32,7 @@
   let { taskResults, isLoggedIn }: Props = $props();
 
   // Prepare contest table provider based on the active contest type.
-  let activeContestType = $state<ContestTableProviders>('abcLatest20Rounds');
+  let activeContestType = $derived(activeContestTypeStore.get());
 
   let provider: ContestTableProvider = $derived(
     contestTableProviders[activeContestType as ContestTableProviders],
@@ -112,8 +113,10 @@
 <ButtonGroup class="m-4 contents-center">
   {#each Object.entries(contestTableProviders) as [type, config]}
     <Button
-      onclick={() => (activeContestType = type as ContestTableProviders)}
-      class={activeContestType === type ? 'active-button-class' : ''}
+      onclick={() => activeContestTypeStore.set(type as ContestTableProviders)}
+      class={activeContestTypeStore.isSame(type as ContestTableProviders)
+        ? 'active-button-class'
+        : ''}
       aria-label={config.getMetadata().ariaLabel}
     >
       {config.getMetadata().buttonLabel}

src/lib/stores/active_contest_type.svelte.ts

@@ -0,0 +1,55 @@
+import { type ContestTableProviders } from '$lib/utils/contest_table_provider';
+
+/**
+ * Store that manages the active contest type selection.
+ *
+ * This class uses Svelte's state management to track which contest type
+ * is currently active button. It provides methods to get, set, and
+ * compare the active contest type.
+ *
+ * The store uses the ContestTableProviders type which represents
+ * different contest table configurations or data providers,
+ * with a default value of 'abcLatest20Rounds'.
+ */
+export class ActiveContestTypeStore {
+  value = $state<ContestTableProviders>('abcLatest20Rounds');
+
+  /**
+   * Creates an instance with the specified contest type.
+   *
+   * @param defaultContestType - The default contest type to initialize.
+   * Defaults to 'abcLatest20Rounds'.
+   */
+  constructor(defaultContestType: ContestTableProviders = 'abcLatest20Rounds') {
+    this.value = defaultContestType;
+  }
+
+  /**
+   * Gets the current contest table providers.
+   *
+   * @returns The current value of contest table providers.
+   */
+  get(): ContestTableProviders {
+    return this.value;
+  }
+
+  /**
+   * Sets the current contest type to the specified value.
+   *
+   * @param newContestType - The contest type to set as the current value
+   */
+  set(newContestType: ContestTableProviders): void {
+    this.value = newContestType;
+  }
+
+  /**
+   * Validates if the current contest type matches the provided contest type.
+   * @param contestType - The contest type to compare against
+   * @returns `true` if the current contest type matches the provided contest type, `false` otherwise
+   */
+  isSame(contestType: ContestTableProviders): boolean {
+    return this.value === contestType;
+  }
+}
+
+export const activeContestTypeStore = new ActiveContestTypeStore();

src/test/lib/stores/active_contest_type.svelte.test.ts

@@ -0,0 +1,50 @@
+import { describe, test, expect, beforeEach } from 'vitest';
+
+import type { ContestTableProviders } from '$lib/utils/contest_table_provider';
+import { ActiveContestTypeStore } from '$lib/stores/active_contest_type.svelte';
+
+describe('ActiveContestTypeStore', () => {
+  let store: ActiveContestTypeStore;
+
+  beforeEach(() => {
+    store = new ActiveContestTypeStore();
+  });
+
+  test('expects to initialize with default value', () => {
+    expect(store.get()).toBe('abcLatest20Rounds');
+  });
+
+  test('expects to return the current value when calling get()', () => {
+    expect(store.get()).toBe('abcLatest20Rounds');
+
+    // Change the value and verify get() returns the new value
+    store.value = 'abc319Onwards' as ContestTableProviders;
+    expect(store.get()).toBe('abc319Onwards');
+  });
+
+  test('expects to update the value when calling set()', () => {
+    store.set('fromAbc212ToAbc318' as ContestTableProviders);
+    expect(store.value).toBe('fromAbc212ToAbc318');
+    expect(store.get()).toBe('fromAbc212ToAbc318');
+
+    store.set('abc319Onwards' as ContestTableProviders);
+    expect(store.value).toBe('abc319Onwards');
+    expect(store.get()).toBe('abc319Onwards');
+  });
+
+  test('expects to correctly determine if contest type is the same with isSame()', () => {
+    expect(store.isSame('abcLatest20Rounds' as ContestTableProviders)).toBe(true);
+    expect(store.isSame('abc319Onwards' as ContestTableProviders)).toBe(false);
+    expect(store.isSame('fromAbc212ToAbc318' as ContestTableProviders)).toBe(false);
+
+    store.set('abc319Onwards' as ContestTableProviders);
+    expect(store.isSame('abc319Onwards' as ContestTableProviders)).toBe(true);
+    expect(store.isSame('abcLatest20Rounds' as ContestTableProviders)).toBe(false);
+    expect(store.isSame('fromAbc212ToAbc318' as ContestTableProviders)).toBe(false);
+
+    store.set('fromAbc212ToAbc318' as ContestTableProviders);
+    expect(store.isSame('fromAbc212ToAbc318' as ContestTableProviders)).toBe(true);
+    expect(store.isSame('abcLatest20Rounds' as ContestTableProviders)).toBe(false);
+    expect(store.isSame('abc319Onwards' as ContestTableProviders)).toBe(false);
+  });
+});