package order

import (
    "testing"
    "github.com/perfect-panel/server/internal/model/coupon"
)

func TestCalculateCoupon_Percent(t *testing.T) {
    c := &coupon.Coupon{Type: 1, Discount: 10}
    got := calculateCoupon(1000, c)
    if got != 100 {
        t.Fatalf("percent coupon expected 100, got %d", got)
    }
}

func TestCalculateCoupon_PercentRounding(t *testing.T) {
    c := &coupon.Coupon{Type: 1, Discount: 10}
    got := calculateCoupon(999, c) // 999*10% = 99.9 → round to 100
    if got != 100 {
        t.Fatalf("percent coupon rounding expected 100, got %d", got)
    }
}

func TestCalculateCoupon_FixedCap(t *testing.T) {
    c := &coupon.Coupon{Type: 2, Discount: 300}
    got := calculateCoupon(200, c)
    if got != 200 {
        t.Fatalf("fixed coupon capped by amount expected 200, got %d", got)
    }
}