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import { ShoppingItem, FilterType, FavouriteItem, Unit } from '../models';
import Fuse from 'fuse.js';
interface StoredListData {
items: ShoppingItem[];
listName: string;
listDescription: string;
favourites?: FavouriteItem[];
}
const STORAGE_KEY = 'nimmit-shopping-list';
@Injectable({
providedIn: 'root'
})
export class ShoppingListService {
// Haupt-Daten
private readonly _items = signal<ShoppingItem[]>([]);
private readonly _listName = signal('Meine Einkaufsliste');
private readonly _listDescription = signal('Tippe auf +, um Produkte hinzuzufügen');
private readonly _favourites = signal<FavouriteItem[]>([]);
private readonly _loaded = signal(false);
// Public readonly signals
readonly items = this._items.asReadonly();
readonly listName = this._listName.asReadonly();
readonly listDescription = this._listDescription.asReadonly();
readonly favourites = this._favourites.asReadonly();
readonly loaded = this._loaded.asReadonly();
constructor() {
this.loadFromStorage();
// Auto-save bei Änderungen
effect(() => {
const data: StoredListData = {
items: this._items(),
listName: this._listName(),
listDescription: this._listDescription(),
favourites: this._favourites()
};
this.saveToStorage(data);
});
}
private loadFromStorage(): void {
try {
const stored = localStorage.getItem(STORAGE_KEY);
Eif (stored) {
const data: StoredListData = JSON.parse(stored);
// Dates wiederherstellen
const items = data.items.map(item => ({
...item,
createdAt: new Date(item.createdAt),
updatedAt: new Date(item.updatedAt)
}));
this._items.set(items);
this._listName.set(data.listName || 'Meine Einkaufsliste');
this._listDescription.set(data.listDescription || 'Tippe auf +, um Produkte hinzuzufügen');
Eif (data.favourites) {
this._favourites.set(data.favourites);
}
}
} catch (e) {
console.error('Fehler beim Laden der Daten:', e);
} finally {
this._loaded.set(true);
}
}
private saveToStorage(data: StoredListData): void {
try {
localStorage.setItem(STORAGE_KEY, JSON.stringify(data));
} catch (e) {
console.error('Fehler beim Speichern der Daten:', e);
}
}
// Computed values
readonly allCount = computed(() => this._items().length);
readonly notPurchasedCount = computed(
() => this._items().filter((item) => item.purchasedQuantity < item.totalQuantity).length
);
readonly purchasedCount = computed(
() => this._items().filter((item) => item.purchasedQuantity >= item.totalQuantity).length
);
readonly progressPercentage = computed(() => {
const total = this.allCount();
Eif (total === 0) return 0;
return (this.purchasedCount() / total) * 100;
});
/**
* Fügt ein neues Item zur Liste hinzu
*/
addItem(item: Omit<ShoppingItem, 'id' | 'createdAt' | 'updatedAt' | 'purchasedQuantity'>): void {
const newItem: ShoppingItem = {
...item,
id: crypto.randomUUID(),
purchasedQuantity: 0,
createdAt: new Date(),
updatedAt: new Date(),
};
this._items.update(items => [...items, newItem]);
}
/**
* Markiert ein Item als gekauft
*/
markAsPurchased(itemId: string): void {
this._items.update(items =>
items.map(item =>
item.id === itemId
? { ...item, purchasedQuantity: item.totalQuantity, updatedAt: new Date() }
: item
)
);
}
/**
* Markiert ein Item als nicht gekauft
*/
markAsNotPurchased(itemId: string): void {
this._items.update(items =>
items.map(item =>
item.id === itemId
? { ...item, purchasedQuantity: 0, updatedAt: new Date() }
: item
)
);
}
/**
* Erhöht die eingekaufte Menge um 1
*/
incrementPurchasedQuantity(itemId: string): void {
this._items.update(items =>
items.map(item =>
item.id === itemId && item.purchasedQuantity < item.totalQuantity
? { ...item, purchasedQuantity: item.purchasedQuantity + 1, updatedAt: new Date() }
: item
)
);
}
/**
* Verringert die eingekaufte Menge um 1
*/
decrementPurchasedQuantity(itemId: string): void {
this._items.update(items =>
items.map(item =>
item.id === itemId && item.purchasedQuantity > 0
? { ...item, purchasedQuantity: item.purchasedQuantity - 1, updatedAt: new Date() }
: item
)
);
}
/**
* Aktualisiert ein Item
*/
updateItem(itemId: string, updates: Partial<ShoppingItem>): void {
this._items.update(items =>
items.map(item =>
item.id === itemId
? { ...item, ...updates, updatedAt: new Date() }
: item
)
);
}
/**
* Löscht ein Item
*/
deleteItem(itemId: string): void {
this._items.update(items => items.filter(item => item.id !== itemId));
}
/**
* Filtert Items basierend auf Filter-Typ, Suchbegriff und Kategorien
*/
getFilteredItems(filter: FilterType, searchQuery: string, selectedCategories: string[] = []): ShoppingItem[] {
const fuse = new Fuse<ShoppingItem>(this._items(), {
keys: ['name', 'category'],
threshold: 0.4,
});
let result: ShoppingItem[] = searchQuery
? fuse.search(searchQuery).map(r => r.item)
: this._items();
// Kategorie-Filter
Eif (selectedCategories.length > 0) {
result = result.filter((item: ShoppingItem) => selectedCategories.includes(item.category));
}
// Tab-Filter
if (filter === 'notPurchased') {
result = result.filter((item: ShoppingItem) => item.purchasedQuantity < item.totalQuantity);
E} else if (filter === 'purchased') {
result = result.filter((item: ShoppingItem) => item.purchasedQuantity >= item.totalQuantity);
}
return result;
}
/**
* Prüft ob ein Item gekauft ist
*/
isPurchased(item: ShoppingItem): boolean {
return item.purchasedQuantity >= item.totalQuantity;
}
/**
* Generiert den Status-Text
*/
getStatusText(item: ShoppingItem): string {
return `${item.purchasedQuantity} von ${item.totalQuantity} gekauft`;
}
/**
* Aktualisiert Listennamen und Beschreibung
*/
updateListInfo(name: string, description: string): void {
this._listName.set(name);
this._listDescription.set(description);
}
// --- Favourites ---
/**
* Toggles a favourite item. If it exists, removes it. If it doesn't, adds it.
*/
toggleFavourite(name: string, category: string, unit: Unit, size?: number): void {
const trimmedName = name.trim();
Eif (!trimmedName) return;
const existingId = this.findFavouriteId(trimmedName, unit, size);
if (existingId) {
this.removeFavourite(existingId);
} else {
this.addFavourite(trimmedName, category, unit, size);
}
}
addFavourite(name: string, category: string, unit: Unit, size?: number): void {
const newFav: FavouriteItem = {
id: crypto.randomUUID(),
name,
category,
unit,
size
};
this._favourites.update(favs => [...favs, newFav]);
}
removeFavourite(id: string): void {
this._favourites.update(favs => favs.filter(f => f.id !== id));
}
updateFavourite(id: string, updates: Partial<FavouriteItem>): void {
this._favourites.update(favs =>
favs.map(fav => (fav.id === id ? { ...fav, ...updates } : fav))
);
}
/**
* Helper to find if a specific combination of name/unit/size is already a favourite
*/
findFavouriteId(name: string, unit: Unit, size?: number): string | undefined {
const trimmedName = name.trim().toLowerCase();
const existing = this._favourites().find(f =>
f.name.toLowerCase() === trimmedName &&
f.unit === unit &&
f.size === size
);
return existing?.id;
}
isCurrentFavourite(name: string, unit: Unit, size?: number): boolean {
return !!this.findFavouriteId(name, unit, size);
}
}
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