T hoguet/issue5 (#37)

* enregistrer les calendar settings dans le localstorage
Fixes #5

* Refactor calendar settings service to use a definitions map for settings and update related components to access settings via a getter method

* Update src/app/services/calendar-settings-service.ts

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

* Refactor calendar settings service to utilize a new storedSignal implementation for localStorage persistence and restore the stored-signal utility

* Update typescript-eslint to version 8.46.3 and enhance error handling in storedSignal function

* Update src/app/services/calendar-settings-service.ts

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

* Enhance storedSignal function to accept an Injector for improved context handling in localStorage persistence

* Skip initial execution in storedSignal effect to prevent unnecessary localStorage writes

* Refactor get method in CalendarSettingsService to throw an error if the setting ID doesn't exist

---------

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

src/app/services/calendar-settings-service.ts

@@ -1,8 +1,8 @@
-import { Injectable, signal, WritableSignal } from '@angular/core';
+import { Injectable, WritableSignal, inject, Injector } from '@angular/core';
+import { storedSignal } from '../shared/utils/stored-signal';
 
-interface CalendarSetting {
-	signal: WritableSignal<boolean>;
-	id: string;
+interface SettingDefinition {
+	defaultValue: boolean;
 	description: string;
 }
 
@@ -10,19 +10,59 @@ interface CalendarSetting {
 	providedIn: 'root',
 })
 export class CalendarSettingsService {
-	readonly showWeekNumbers = signal(false);
-	readonly samediMalin = signal(true);
+	private readonly injector = inject(Injector);
 
-	readonly settings: readonly CalendarSetting[] = [
-		{
-			signal: this.showWeekNumbers,
-			id: 'showWeekNumbers',
-			description: 'Afficher les numéros de semaine',
-		},
-		{
-			signal: this.samediMalin,
-			id: 'samediMalin',
-			description: 'Activer le Samedi Malin',
-		},
-	];
+	private readonly definitions = new Map<string, SettingDefinition>([
+		[
+			'showWeekNumbers',
+			{
+				defaultValue: false,
+				description: 'Afficher les numéros de semaine',
+			},
+		],
+		[
+			'samediMalin',
+			{
+				defaultValue: true,
+				description: 'Activer le Samedi Malin',
+			},
+		],
+	]);
+
+	private readonly signals = new Map<string, WritableSignal<boolean>>();
+
+	readonly settingsArray: ReadonlyArray<{
+		id: string;
+		signal: WritableSignal<boolean>;
+		description: string;
+	}>;
+
+	constructor() {
+		for (const [id, def] of this.definitions) {
+			const storageKey = `calendarSettings.${id}`;
+			this.signals.set(id, storedSignal(storageKey, def.defaultValue, this.injector));
+		}
+
+		this.settingsArray = Array.from(this.definitions.entries()).map(([id, def]) => ({
+			id,
+			signal: this.signals.get(id)!,
+			description: def.description,
+		}));
+	}
+
+	/**
+	 * Returns the signal for the given setting ID.
+	 * @throws Error if the setting ID doesn't exist
+	 */
+	get(id: string): WritableSignal<boolean> {
+		const signal = this.signals.get(id);
+		if (!signal) {
+			throw new Error(`Setting with id "${id}" does not exist`);
+		}
+		return signal;
+	}
+
+	getDescription(id: string): string {
+		return this.definitions.get(id)?.description ?? '';
+	}
 }