File size: 1,675 Bytes
63f6453 | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 | /**
* Alışveriş sepeti. Fiyatlar kuruş (tam sayı) olarak tutulur.
*/
class Cart {
constructor() {
this.items = new Map(); // sku -> { name, unitPrice, qty }
this.coupon = null;
}
add(sku, name, unitPrice, qty = 1) {
if (!Number.isInteger(unitPrice) || unitPrice < 0) throw new TypeError('unitPrice negatif olmayan tam sayı olmalı');
if (!Number.isInteger(qty) || qty < 1) throw new RangeError('qty en az 1 olmalı');
const cur = this.items.get(sku);
if (cur) cur.qty += qty;
else this.items.set(sku, { name, unitPrice, qty });
return this;
}
remove(sku, qty = Infinity) {
const cur = this.items.get(sku);
if (!cur) return false;
if (qty >= cur.qty) this.items.delete(sku);
else cur.qty -= qty;
return true;
}
subtotal() {
let sum = 0;
for (const { unitPrice, qty } of this.items.values()) sum += unitPrice * qty;
return sum;
}
applyCoupon(code) {
const coupons = { YUZDE10: { type: 'percent', value: 10 }, INDIRIM50: { type: 'fixed', value: 5000 } };
const c = coupons[String(code).toUpperCase()];
if (!c) throw new Error('Geçersiz kupon');
this.coupon = c;
}
discount() {
const sub = this.subtotal();
if (!this.coupon) return 0;
if (this.coupon.type === 'percent') return Math.round((sub * this.coupon.value) / 100);
return Math.min(this.coupon.value, sub);
}
shipping() {
const afterDiscount = this.subtotal() - this.discount();
if (this.items.size === 0) return 0;
return afterDiscount >= 50000 ? 0 : 2999;
}
total() {
return this.subtotal() - this.discount() + this.shipping();
}
}
module.exports = { Cart };
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