Mengenrabatt: Staffel im Rechner und eine Seite im Web
agentd task 4027a3aa01be47e9b677e7c687e4b183
This commit is contained in:
agentd
@@ -16,6 +16,57 @@ public static class PriceCalculator
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throw new ArgumentOutOfRangeException(nameof(discountPercent), "A discount is between 0 and 100 percent.");
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}
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return price - discountPercent;
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return price * (1m - discountPercent / 100m);
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}
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/// <summary>Rounds an amount to the nearest 0.05, rounding halves away from zero.</summary>
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public static decimal RoundToFiveRappen(decimal amount)
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{
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return Math.Round(amount * 20m, MidpointRounding.AwayFromZero) / 20m;
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}
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/// <summary>Returns the quantity discount percent for a quantity: 0, 5 or 10.</summary>
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public static int GetQuantityDiscountPercent(int quantity)
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{
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if (quantity < 1)
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{
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throw new ArgumentOutOfRangeException(nameof(quantity), "A quantity must be at least 1.");
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}
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return quantity switch
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{
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>= 50 => 10,
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>= 10 => 5,
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_ => 0,
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};
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}
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/// <summary>
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/// Calculates the total: percentage discount on the unit price first, then the quantity
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/// discount on the total, then rounds the end amount to the nearest 0.05.
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/// </summary>
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public static decimal CalculateTotal(decimal unitPrice, int quantity, decimal discountPercent)
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{
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if (unitPrice < 0)
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{
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throw new ArgumentOutOfRangeException(nameof(unitPrice), "A price cannot be negative.");
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}
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if (quantity < 1)
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{
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throw new ArgumentOutOfRangeException(nameof(quantity), "A quantity must be at least 1.");
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}
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if (discountPercent is < 0 or > 100)
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{
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throw new ArgumentOutOfRangeException(nameof(discountPercent), "A discount is between 0 and 100 percent.");
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}
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var discountedUnitPrice = ApplyDiscount(unitPrice, discountPercent);
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var totalBeforeQuantityDiscount = discountedUnitPrice * quantity;
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var quantityDiscountPercent = GetQuantityDiscountPercent(quantity);
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var totalBeforeRounding = totalBeforeQuantityDiscount * (1m - quantityDiscountPercent / 100m);
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return RoundToFiveRappen(totalBeforeRounding);
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}
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}
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@@ -33,4 +33,94 @@ public sealed class PriceCalculatorTests
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{
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Assert.Throws<ArgumentOutOfRangeException>(() => PriceCalculator.ApplyDiscount(100m, 101m));
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}
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[Fact]
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public void Quantity_9_gets_no_quantity_discount()
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{
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Assert.Equal(0, PriceCalculator.GetQuantityDiscountPercent(9));
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}
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[Fact]
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public void Quantity_10_gets_five_percent_quantity_discount()
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{
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Assert.Equal(5, PriceCalculator.GetQuantityDiscountPercent(10));
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}
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[Fact]
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public void Quantity_49_gets_five_percent_quantity_discount()
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{
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Assert.Equal(5, PriceCalculator.GetQuantityDiscountPercent(49));
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}
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[Fact]
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public void Quantity_50_gets_ten_percent_quantity_discount()
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{
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Assert.Equal(10, PriceCalculator.GetQuantityDiscountPercent(50));
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}
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[Fact]
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public void Quantity_below_one_is_refused()
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{
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Assert.Throws<ArgumentOutOfRangeException>(() => PriceCalculator.GetQuantityDiscountPercent(0));
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}
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[Fact]
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public void Total_applies_five_percent_quantity_discount()
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{
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Assert.Equal(950m, PriceCalculator.CalculateTotal(100m, 10, 0m));
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}
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[Fact]
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public void Total_applies_percentage_discount_before_quantity_discount()
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{
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Assert.Equal(712.5m, PriceCalculator.CalculateTotal(100m, 10, 25m));
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}
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[Fact]
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public void Total_applies_ten_percent_quantity_discount_for_fifty_pieces()
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{
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Assert.Equal(4500m, PriceCalculator.CalculateTotal(100m, 50, 0m));
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}
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[Fact]
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public void Rounding_rounds_up_to_the_nearest_five_rappen()
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{
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Assert.Equal(1.25m, PriceCalculator.RoundToFiveRappen(1.23m));
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}
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[Fact]
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public void Rounding_rounds_down_to_the_nearest_five_rappen()
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{
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Assert.Equal(1.20m, PriceCalculator.RoundToFiveRappen(1.21m));
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}
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[Fact]
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public void Rounding_rounds_midpoints_away_from_zero()
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{
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Assert.Equal(1.15m, PriceCalculator.RoundToFiveRappen(1.125m));
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}
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[Fact]
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public void Total_rounds_after_the_quantity_discount()
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{
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Assert.Equal(15.85m, PriceCalculator.CalculateTotal(1.67m, 10, 0m));
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}
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[Fact]
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public void Total_refuses_a_negative_unit_price()
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{
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Assert.Throws<ArgumentOutOfRangeException>(() => PriceCalculator.CalculateTotal(-1m, 1, 0m));
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}
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[Fact]
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public void Total_refuses_a_quantity_below_one()
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{
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Assert.Throws<ArgumentOutOfRangeException>(() => PriceCalculator.CalculateTotal(10m, 0, 0m));
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}
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[Fact]
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public void Total_refuses_a_discount_above_100_percent()
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{
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Assert.Throws<ArgumentOutOfRangeException>(() => PriceCalculator.CalculateTotal(10m, 1, 101m));
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}
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}
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@@ -1,344 +1,9 @@
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<!-- * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * -->
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<!-- * * * * * * * * * * * The content below * * * * * * * * * * * -->
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<!-- * * * * * * * * * * is only a placeholder * * * * * * * * * * -->
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<!-- * * * * * * * * * * and can be replaced. * * * * * * * * * * -->
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<!-- * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * -->
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<!-- * * * * * * * * * Delete the template below * * * * * * * * * -->
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<!-- * * * * * * * to get started with your project! * * * * * * * -->
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<!-- * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * -->
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<style>
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:host {
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--bright-blue: oklch(51.01% 0.274 263.83);
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--electric-violet: oklch(53.18% 0.28 296.97);
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--french-violet: oklch(47.66% 0.246 305.88);
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--vivid-pink: oklch(69.02% 0.277 332.77);
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--hot-red: oklch(61.42% 0.238 15.34);
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--orange-red: oklch(63.32% 0.24 31.68);
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--gray-900: oklch(19.37% 0.006 300.98);
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--gray-700: oklch(36.98% 0.014 302.71);
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--gray-400: oklch(70.9% 0.015 304.04);
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--red-to-pink-to-purple-vertical-gradient: linear-gradient(
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180deg,
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var(--orange-red) 0%,
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var(--vivid-pink) 50%,
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var(--electric-violet) 100%
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);
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--red-to-pink-to-purple-horizontal-gradient: linear-gradient(
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90deg,
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var(--orange-red) 0%,
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var(--vivid-pink) 50%,
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var(--electric-violet) 100%
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);
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--pill-accent: var(--bright-blue);
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font-family: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto,
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Helvetica, Arial, sans-serif, "Apple Color Emoji", "Segoe UI Emoji",
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"Segoe UI Symbol";
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box-sizing: border-box;
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-webkit-font-smoothing: antialiased;
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-moz-osx-font-smoothing: grayscale;
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display: block;
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height: 100dvh;
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}
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h1 {
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font-size: 3.125rem;
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color: var(--gray-900);
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font-weight: 500;
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line-height: 100%;
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letter-spacing: -0.125rem;
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margin: 0;
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font-family: "Inter Tight", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto,
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Helvetica, Arial, sans-serif, "Apple Color Emoji", "Segoe UI Emoji",
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"Segoe UI Symbol";
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}
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p {
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margin: 0;
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color: var(--gray-700);
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}
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main {
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width: 100%;
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min-height: 100%;
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display: flex;
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justify-content: center;
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align-items: center;
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padding: 1rem;
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box-sizing: inherit;
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position: relative;
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}
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.angular-logo {
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max-width: 9.2rem;
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}
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.content {
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display: flex;
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justify-content: space-around;
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width: 100%;
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max-width: 700px;
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margin-bottom: 3rem;
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}
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.content h1 {
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margin-top: 1.75rem;
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}
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.content p {
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margin-top: 1.5rem;
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}
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.divider {
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width: 1px;
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background: var(--red-to-pink-to-purple-vertical-gradient);
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margin-inline: 0.5rem;
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}
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.pill-group {
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display: flex;
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flex-direction: column;
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align-items: start;
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flex-wrap: wrap;
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gap: 1.25rem;
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}
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.pill {
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display: flex;
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align-items: center;
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--pill-accent: var(--bright-blue);
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background: color-mix(in srgb, var(--pill-accent) 5%, transparent);
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color: var(--pill-accent);
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padding-inline: 0.75rem;
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padding-block: 0.375rem;
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border-radius: 2.75rem;
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border: 0;
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transition: background 0.3s ease;
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font-family: var(--inter-font);
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font-size: 0.875rem;
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font-style: normal;
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font-weight: 500;
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line-height: 1.4rem;
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letter-spacing: -0.00875rem;
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text-decoration: none;
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white-space: nowrap;
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}
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.pill:hover {
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background: color-mix(in srgb, var(--pill-accent) 15%, transparent);
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}
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.pill-group .pill:nth-child(6n + 1) {
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--pill-accent: var(--bright-blue);
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}
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.pill-group .pill:nth-child(6n + 2) {
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--pill-accent: var(--electric-violet);
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}
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.pill-group .pill:nth-child(6n + 3) {
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--pill-accent: var(--french-violet);
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}
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.pill-group .pill:nth-child(6n + 4),
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.pill-group .pill:nth-child(6n + 5),
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.pill-group .pill:nth-child(6n + 6) {
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--pill-accent: var(--hot-red);
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}
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.pill-group svg {
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margin-inline-start: 0.25rem;
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}
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.social-links {
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display: flex;
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align-items: center;
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gap: 0.73rem;
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margin-top: 1.5rem;
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}
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.social-links path {
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transition: fill 0.3s ease;
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fill: var(--gray-400);
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}
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.social-links a:hover svg path {
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fill: var(--gray-900);
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}
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@media screen and (max-width: 650px) {
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.content {
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flex-direction: column;
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width: max-content;
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}
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.divider {
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height: 1px;
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width: 100%;
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background: var(--red-to-pink-to-purple-horizontal-gradient);
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margin-block: 1.5rem;
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}
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}
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</style>
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<main class="main">
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<div class="content">
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<div class="left-side">
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<svg
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xmlns="http://www.w3.org/2000/svg"
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viewBox="0 0 982 239"
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fill="none"
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class="angular-logo"
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>
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<g clip-path="url(#a)">
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<path
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fill="url(#b)"
|
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|
||||
d="M27.4896 1.52422C27.9301 1.96749 28.2463 2.51866 28.4068 3.12258C29.0004 5.35161 29.0004 10 29.0004 10C29.0004 10 29.0004 14.6484 28.4068 16.8774C28.2463 17.4813 27.9301 18.0325 27.4896 18.4758C27.0492 18.9191 26.5 19.2389 25.8972 19.4032C23.6778 20 14.8068 20 14.8068 20C14.8068 20 5.93586 20 3.71651 19.4032C3.11363 19.2389 2.56449 18.9191 2.12405 18.4758C1.68361 18.0325 1.36732 17.4813 1.20683 16.8774C0.613281 14.6484 0.613281 10 0.613281 10C0.613281 10 0.613281 5.35161 1.20683 3.12258C1.36732 2.51866 1.68361 1.96749 2.12405 1.52422C2.56449 1.08095 3.11363 0.76113 3.71651 0.596774C5.93586 0 14.8068 0 14.8068 0C14.8068 0 23.6778 0 25.8972 0.596774C26.5 0.76113 27.0492 1.08095 27.4896 1.52422ZM19.3229 10L11.9036 5.77905V14.221L19.3229 10Z"
|
||||
/>
|
||||
</svg>
|
||||
</a>
|
||||
</div>
|
||||
</div>
|
||||
</div>
|
||||
<header class="app-header">
|
||||
<h1 class="app-title">{{ title() }}</h1>
|
||||
<nav class="app-nav">
|
||||
<a routerLink="/mengenrabatt" class="app-nav-link">Mengenrabatt-Rechner</a>
|
||||
</nav>
|
||||
</header>
|
||||
<main class="app-main">
|
||||
<router-outlet />
|
||||
</main>
|
||||
|
||||
<!-- * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * -->
|
||||
<!-- * * * * * * * * * * * The content above * * * * * * * * * * * * -->
|
||||
<!-- * * * * * * * * * * is only a placeholder * * * * * * * * * * * -->
|
||||
<!-- * * * * * * * * * * and can be replaced. * * * * * * * * * * * -->
|
||||
<!-- * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * -->
|
||||
<!-- * * * * * * * * * * End of Placeholder * * * * * * * * * * * * -->
|
||||
<!-- * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * -->
|
||||
|
||||
|
||||
<router-outlet />
|
||||
|
||||
@@ -1,3 +1,7 @@
|
||||
import { Routes } from '@angular/router';
|
||||
import { MengenrabattRechner } from './mengenrabatt-rechner/mengenrabatt-rechner';
|
||||
|
||||
export const routes: Routes = [];
|
||||
export const routes: Routes = [
|
||||
{ path: 'mengenrabatt', component: MengenrabattRechner },
|
||||
{ path: '', pathMatch: 'full', redirectTo: 'mengenrabatt' },
|
||||
];
|
||||
|
||||
@@ -0,0 +1,41 @@
|
||||
:host {
|
||||
display: block;
|
||||
min-height: 100dvh;
|
||||
font-family: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
|
||||
color: var(--app-fg, #1a1a1a);
|
||||
background: var(--app-bg, #f7f7f7);
|
||||
}
|
||||
|
||||
.app-header {
|
||||
display: flex;
|
||||
align-items: center;
|
||||
gap: 1.5rem;
|
||||
padding: 1rem 1.5rem;
|
||||
background: var(--app-header-bg, #ffffff);
|
||||
border-bottom: 1px solid var(--app-border, #d0d0d0);
|
||||
}
|
||||
|
||||
.app-title {
|
||||
margin: 0;
|
||||
font-size: 1.25rem;
|
||||
font-weight: 600;
|
||||
}
|
||||
|
||||
.app-nav {
|
||||
display: flex;
|
||||
gap: 1rem;
|
||||
}
|
||||
|
||||
.app-nav-link {
|
||||
color: var(--app-link, #0a58ca);
|
||||
text-decoration: none;
|
||||
}
|
||||
|
||||
.app-nav-link:hover,
|
||||
.app-nav-link:focus {
|
||||
text-decoration: underline;
|
||||
}
|
||||
|
||||
.app-main {
|
||||
display: block;
|
||||
}
|
||||
|
||||
@@ -1,10 +1,13 @@
|
||||
import { TestBed } from '@angular/core/testing';
|
||||
import { provideRouter } from '@angular/router';
|
||||
import { App } from './app';
|
||||
import { routes } from './app.routes';
|
||||
|
||||
describe('App', () => {
|
||||
beforeEach(async () => {
|
||||
await TestBed.configureTestingModule({
|
||||
imports: [App],
|
||||
providers: [provideRouter(routes)],
|
||||
}).compileComponents();
|
||||
});
|
||||
|
||||
@@ -14,10 +17,20 @@ describe('App', () => {
|
||||
expect(app).toBeTruthy();
|
||||
});
|
||||
|
||||
it('should render title', async () => {
|
||||
it('should render the app title', async () => {
|
||||
const fixture = TestBed.createComponent(App);
|
||||
fixture.detectChanges();
|
||||
await fixture.whenStable();
|
||||
const compiled = fixture.nativeElement as HTMLElement;
|
||||
expect(compiled.querySelector('h1')?.textContent).toContain('Hello, web');
|
||||
expect(compiled.querySelector('h1')?.textContent).toContain('Preisrechner');
|
||||
});
|
||||
|
||||
it('should render the navigation link to the volume discount calculator', async () => {
|
||||
const fixture = TestBed.createComponent(App);
|
||||
fixture.detectChanges();
|
||||
await fixture.whenStable();
|
||||
const compiled = fixture.nativeElement as HTMLElement;
|
||||
const link = compiled.querySelector('a[href="/mengenrabatt"]');
|
||||
expect(link?.textContent).toContain('Mengenrabatt-Rechner');
|
||||
});
|
||||
});
|
||||
|
||||
@@ -1,12 +1,13 @@
|
||||
import { Component, signal } from '@angular/core';
|
||||
import { RouterOutlet } from '@angular/router';
|
||||
import { ChangeDetectionStrategy, Component, signal } from '@angular/core';
|
||||
import { RouterLink, RouterOutlet } from '@angular/router';
|
||||
|
||||
@Component({
|
||||
selector: 'app-root',
|
||||
imports: [RouterOutlet],
|
||||
changeDetection: ChangeDetectionStrategy.OnPush,
|
||||
imports: [RouterOutlet, RouterLink],
|
||||
templateUrl: './app.html',
|
||||
styleUrl: './app.scss'
|
||||
styleUrl: './app.scss',
|
||||
})
|
||||
export class App {
|
||||
protected readonly title = signal('web');
|
||||
protected readonly title = signal('Preisrechner');
|
||||
}
|
||||
|
||||
54
web/src/app/mengenrabatt-rechner/mengenrabatt-rechner.html
Normal file
54
web/src/app/mengenrabatt-rechner/mengenrabatt-rechner.html
Normal file
@@ -0,0 +1,54 @@
|
||||
<section class="mengenrabatt-rechner">
|
||||
<h1>Mengenrabatt-Rechner</h1>
|
||||
|
||||
<div class="field">
|
||||
<label for="unit-price">Stückpreis (CHF)</label>
|
||||
<input
|
||||
id="unit-price"
|
||||
type="number"
|
||||
inputmode="decimal"
|
||||
min="0"
|
||||
step="0.05"
|
||||
[value]="unitPriceInput()"
|
||||
(input)="unitPriceInput.set($any($event.target).value)"
|
||||
/>
|
||||
</div>
|
||||
|
||||
<div class="field">
|
||||
<label for="quantity">Menge</label>
|
||||
<input
|
||||
id="quantity"
|
||||
type="number"
|
||||
inputmode="numeric"
|
||||
min="1"
|
||||
step="1"
|
||||
[value]="quantityInput()"
|
||||
(input)="quantityInput.set($any($event.target).value)"
|
||||
/>
|
||||
</div>
|
||||
|
||||
<div class="field">
|
||||
<label for="percent-discount">Prozentrabatt (%)</label>
|
||||
<input
|
||||
id="percent-discount"
|
||||
type="number"
|
||||
inputmode="decimal"
|
||||
min="0"
|
||||
max="100"
|
||||
step="0.1"
|
||||
[value]="percentDiscountInput()"
|
||||
(input)="percentDiscountInput.set($any($event.target).value)"
|
||||
/>
|
||||
</div>
|
||||
|
||||
<dl class="result">
|
||||
<div class="result-row">
|
||||
<dt>Endbetrag</dt>
|
||||
<dd data-testid="endbetrag">{{ endbetragLabel() }}</dd>
|
||||
</div>
|
||||
<div class="result-row">
|
||||
<dt>Staffelstufe</dt>
|
||||
<dd data-testid="staffelstufe">{{ staffelLabel() }}</dd>
|
||||
</div>
|
||||
</dl>
|
||||
</section>
|
||||
55
web/src/app/mengenrabatt-rechner/mengenrabatt-rechner.scss
Normal file
55
web/src/app/mengenrabatt-rechner/mengenrabatt-rechner.scss
Normal file
@@ -0,0 +1,55 @@
|
||||
.mengenrabatt-rechner {
|
||||
display: grid;
|
||||
gap: 1rem;
|
||||
max-width: 32rem;
|
||||
margin: 2rem auto;
|
||||
padding: 1.5rem;
|
||||
border: 1px solid var(--app-border, #d0d0d0);
|
||||
border-radius: 0.5rem;
|
||||
font-family: inherit;
|
||||
}
|
||||
|
||||
.mengenrabatt-rechner h1 {
|
||||
margin: 0;
|
||||
font-size: 1.5rem;
|
||||
}
|
||||
|
||||
.field {
|
||||
display: grid;
|
||||
gap: 0.25rem;
|
||||
}
|
||||
|
||||
.field label {
|
||||
font-weight: 600;
|
||||
}
|
||||
|
||||
.field input {
|
||||
padding: 0.5rem 0.75rem;
|
||||
font: inherit;
|
||||
border: 1px solid var(--app-border, #d0d0d0);
|
||||
border-radius: 0.25rem;
|
||||
}
|
||||
|
||||
.result {
|
||||
display: grid;
|
||||
gap: 0.5rem;
|
||||
margin: 0;
|
||||
padding-top: 1rem;
|
||||
border-top: 1px solid var(--app-border, #d0d0d0);
|
||||
}
|
||||
|
||||
.result-row {
|
||||
display: flex;
|
||||
justify-content: space-between;
|
||||
align-items: baseline;
|
||||
margin: 0;
|
||||
}
|
||||
|
||||
.result-row dt {
|
||||
font-weight: 600;
|
||||
}
|
||||
|
||||
.result-row dd {
|
||||
margin: 0;
|
||||
font-variant-numeric: tabular-nums;
|
||||
}
|
||||
107
web/src/app/mengenrabatt-rechner/mengenrabatt-rechner.spec.ts
Normal file
107
web/src/app/mengenrabatt-rechner/mengenrabatt-rechner.spec.ts
Normal file
@@ -0,0 +1,107 @@
|
||||
import { TestBed, ComponentFixture } from '@angular/core/testing';
|
||||
import { MengenrabattRechner } from './mengenrabatt-rechner';
|
||||
|
||||
function setInputs(
|
||||
fixture: ComponentFixture<MengenrabattRechner>,
|
||||
unitPrice: string,
|
||||
quantity: string,
|
||||
percent: string,
|
||||
): void {
|
||||
const inputs = fixture.nativeElement.querySelectorAll('input');
|
||||
(inputs[0] as HTMLInputElement).value = unitPrice;
|
||||
inputs[0].dispatchEvent(new Event('input'));
|
||||
(inputs[1] as HTMLInputElement).value = quantity;
|
||||
inputs[1].dispatchEvent(new Event('input'));
|
||||
(inputs[2] as HTMLInputElement).value = percent;
|
||||
inputs[2].dispatchEvent(new Event('input'));
|
||||
fixture.detectChanges();
|
||||
}
|
||||
|
||||
function compute(unitPrice: string, quantity: string, percent: string): {
|
||||
endbetrag: string;
|
||||
staffelstufe: string;
|
||||
} {
|
||||
const fixture = TestBed.createComponent(MengenrabattRechner);
|
||||
fixture.detectChanges();
|
||||
setInputs(fixture, unitPrice, quantity, percent);
|
||||
const compiled = fixture.nativeElement as HTMLElement;
|
||||
return {
|
||||
endbetrag: (compiled.querySelector('[data-testid="endbetrag"]')?.textContent ?? '').trim(),
|
||||
staffelstufe: (compiled.querySelector('[data-testid="staffelstufe"]')?.textContent ?? '').trim(),
|
||||
};
|
||||
}
|
||||
|
||||
describe('MengenrabattRechner', () => {
|
||||
beforeEach(async () => {
|
||||
await TestBed.configureTestingModule({
|
||||
imports: [MengenrabattRechner],
|
||||
}).compileComponents();
|
||||
});
|
||||
|
||||
describe('quantity tiers', () => {
|
||||
it('uses the 0% tier for 9 pieces', () => {
|
||||
const { endbetrag, staffelstufe } = compute('10', '9', '0');
|
||||
expect(staffelstufe).toBe('0 % (1–9 Stück)');
|
||||
expect(endbetrag).toContain('90.00');
|
||||
});
|
||||
|
||||
it('switches to the 5% tier at 10 pieces', () => {
|
||||
const { endbetrag, staffelstufe } = compute('10', '10', '0');
|
||||
expect(staffelstufe).toBe('5 % (10–49 Stück)');
|
||||
expect(endbetrag).toContain('95.00');
|
||||
});
|
||||
|
||||
it('stays on the 5% tier at 49 pieces', () => {
|
||||
const { endbetrag, staffelstufe } = compute('1', '49', '0');
|
||||
expect(staffelstufe).toBe('5 % (10–49 Stück)');
|
||||
// 1 * 0.95 * 49 = 46.55
|
||||
expect(endbetrag).toContain('46.55');
|
||||
});
|
||||
|
||||
it('switches to the 10% tier at 50 pieces', () => {
|
||||
const { endbetrag, staffelstufe } = compute('1', '50', '0');
|
||||
expect(staffelstufe).toBe('10 % (ab 50 Stück)');
|
||||
// 1 * 0.9 * 50 = 45.00
|
||||
expect(endbetrag).toContain('45.00');
|
||||
});
|
||||
});
|
||||
|
||||
describe('discount pipeline', () => {
|
||||
it('applies percentage discount first, then the quantity tier discount (100/10/25 → 712.50)', () => {
|
||||
const { endbetrag, staffelstufe } = compute('100', '10', '25');
|
||||
// 100 * 0.75 = 75; 75 * 10 = 750; quantity tier 5%: 750 * 0.95 = 712.50
|
||||
expect(endbetrag).toContain('712.50');
|
||||
expect(staffelstufe).toBe('5 % (10–49 Stück)');
|
||||
});
|
||||
});
|
||||
|
||||
describe('rounding to 0.05', () => {
|
||||
it('rounds 1.23 up to 1.25', () => {
|
||||
const { endbetrag } = compute('1.23', '1', '0');
|
||||
// 1 piece is in the 1–9 tier (0%); rounded to 0.05: 1.23 -> 1.25
|
||||
expect(endbetrag).toContain('1.25');
|
||||
});
|
||||
});
|
||||
|
||||
describe('invalid input', () => {
|
||||
it('shows the placeholder when inputs are empty', () => {
|
||||
const { endbetrag, staffelstufe } = compute('', '', '');
|
||||
expect(endbetrag).toBe('—');
|
||||
expect(staffelstufe).toBe('—');
|
||||
});
|
||||
|
||||
it('shows the placeholder for a non-integer quantity', () => {
|
||||
const { endbetrag } = compute('10', '3.5', '0');
|
||||
expect(endbetrag).toBe('—');
|
||||
});
|
||||
});
|
||||
|
||||
describe('DOM output', () => {
|
||||
it('renders the Endbetrag with two decimals and the German Staffelstufe label', () => {
|
||||
const { endbetrag, staffelstufe } = compute('100', '10', '25');
|
||||
expect(endbetrag).toMatch(/\d+\.\d{2}/);
|
||||
expect(endbetrag).toContain('712.50');
|
||||
expect(staffelstufe).toBe('5 % (10–49 Stück)');
|
||||
});
|
||||
});
|
||||
});
|
||||
99
web/src/app/mengenrabatt-rechner/mengenrabatt-rechner.ts
Normal file
99
web/src/app/mengenrabatt-rechner/mengenrabatt-rechner.ts
Normal file
@@ -0,0 +1,99 @@
|
||||
import { ChangeDetectionStrategy, Component, computed, signal } from '@angular/core';
|
||||
|
||||
interface DiscountTier {
|
||||
readonly minQuantity: number;
|
||||
readonly maxQuantity: number | null;
|
||||
readonly percent: number;
|
||||
readonly label: string;
|
||||
}
|
||||
|
||||
const TIERS: readonly DiscountTier[] = [
|
||||
{ minQuantity: 1, maxQuantity: 9, percent: 0, label: '0 % (1–9 Stück)' },
|
||||
{ minQuantity: 10, maxQuantity: 49, percent: 5, label: '5 % (10–49 Stück)' },
|
||||
{ minQuantity: 50, maxQuantity: null, percent: 10, label: '10 % (ab 50 Stück)' },
|
||||
];
|
||||
|
||||
const PERCENT_DIVISOR = 100;
|
||||
const ROUNDING_STEP = 20; // 1 / 0.05 → multiply before rounding
|
||||
|
||||
function tierFor(quantity: number): DiscountTier | null {
|
||||
for (const tier of TIERS) {
|
||||
if (quantity >= tier.minQuantity && (tier.maxQuantity === null || quantity <= tier.maxQuantity)) {
|
||||
return tier;
|
||||
}
|
||||
}
|
||||
return null;
|
||||
}
|
||||
|
||||
function parseNumber(value: string): number | null {
|
||||
if (value.trim() === '') {
|
||||
return null;
|
||||
}
|
||||
const parsed = Number(value.replace(',', '.'));
|
||||
return Number.isFinite(parsed) ? parsed : null;
|
||||
}
|
||||
|
||||
function formatChf(value: number): string {
|
||||
return `CHF\u00a0${value.toFixed(2)}`;
|
||||
}
|
||||
|
||||
@Component({
|
||||
selector: 'app-mengenrabatt-rechner',
|
||||
changeDetection: ChangeDetectionStrategy.OnPush,
|
||||
imports: [],
|
||||
templateUrl: './mengenrabatt-rechner.html',
|
||||
styleUrl: './mengenrabatt-rechner.scss',
|
||||
})
|
||||
export class MengenrabattRechner {
|
||||
protected readonly unitPriceInput = signal('');
|
||||
protected readonly quantityInput = signal('');
|
||||
protected readonly percentDiscountInput = signal('');
|
||||
|
||||
private readonly unitPrice = computed(() => parseNumber(this.unitPriceInput()));
|
||||
private readonly quantity = computed(() => {
|
||||
const value = parseNumber(this.quantityInput());
|
||||
if (value === null || !Number.isInteger(value) || value <= 0) {
|
||||
return null;
|
||||
}
|
||||
return value;
|
||||
});
|
||||
private readonly percentDiscount = computed(() => {
|
||||
const value = parseNumber(this.percentDiscountInput());
|
||||
if (value === null || value < 0 || value > 100) {
|
||||
return null;
|
||||
}
|
||||
return value;
|
||||
});
|
||||
|
||||
protected readonly tier = computed<DiscountTier | null>(() => {
|
||||
const quantity = this.quantity();
|
||||
return quantity === null ? null : tierFor(quantity);
|
||||
});
|
||||
|
||||
private readonly total = computed<number | null>(() => {
|
||||
const unitPrice = this.unitPrice();
|
||||
const quantity = this.quantity();
|
||||
const percentDiscount = this.percentDiscount();
|
||||
const tier = this.tier();
|
||||
if (
|
||||
unitPrice === null ||
|
||||
unitPrice < 0 ||
|
||||
quantity === null ||
|
||||
percentDiscount === null ||
|
||||
tier === null
|
||||
) {
|
||||
return null;
|
||||
}
|
||||
const discountedUnit = unitPrice * (1 - percentDiscount / PERCENT_DIVISOR);
|
||||
const subtotal = discountedUnit * quantity;
|
||||
const withTierDiscount = subtotal * (1 - tier.percent / PERCENT_DIVISOR);
|
||||
return Math.round(withTierDiscount * ROUNDING_STEP) / ROUNDING_STEP;
|
||||
});
|
||||
|
||||
protected readonly endbetragLabel = computed<string>(() => {
|
||||
const value = this.total();
|
||||
return value === null ? '—' : formatChf(value);
|
||||
});
|
||||
|
||||
protected readonly staffelLabel = computed<string>(() => this.tier()?.label ?? '—');
|
||||
}
|
||||
Reference in New Issue
Block a user