[PM-30108] import discount from stripe (#6982)

* [PM-30108] import discount from stripe

* fix repo tests

* pr feedback

* wrap discounts in feature flag

* claude pr feedback

test/Admin.Test/Billing/Models/SubscriptionDiscountViewModelTests.cs

@@ -0,0 +1,168 @@
+using Bit.Admin.Billing.Models;
+using Bit.Core.Billing.Enums;
+
+namespace Admin.Test.Billing.Models;
+
+public class SubscriptionDiscountViewModelTests
+{
+    [Fact]
+    public void DiscountDisplay_WithPercentOff_ReturnsFormattedPercent()
+    {
+        var model = new SubscriptionDiscountViewModel
+        {
+            PercentOff = 25m
+        };
+
+        Assert.Equal("25% off", model.DiscountDisplay);
+    }
+
+    [Fact]
+    public void DiscountDisplay_WithDecimalPercentOff_ReturnsFormattedPercentWithDecimals()
+    {
+        var model = new SubscriptionDiscountViewModel
+        {
+            PercentOff = 33.5m
+        };
+
+        Assert.Equal("33.5% off", model.DiscountDisplay);
+    }
+
+    [Fact]
+    public void DiscountDisplay_WithWholeNumberPercentOff_ReturnsFormattedPercentWithoutDecimals()
+    {
+        var model = new SubscriptionDiscountViewModel
+        {
+            PercentOff = 50.00m
+        };
+
+        Assert.Equal("50% off", model.DiscountDisplay);
+    }
+
+    [Fact]
+    public void DiscountDisplay_WithAmountOff_ReturnsFormattedDollar()
+    {
+        var model = new SubscriptionDiscountViewModel
+        {
+            AmountOff = 1000
+        };
+
+        Assert.Equal("$10 off", model.DiscountDisplay);
+    }
+
+    [Fact]
+    public void DiscountDisplay_WithZeroAmountOff_ReturnsZero()
+    {
+        var model = new SubscriptionDiscountViewModel
+        {
+            AmountOff = 0
+        };
+
+        Assert.Equal("$0 off", model.DiscountDisplay);
+    }
+
+    [Fact]
+    public void IsRestrictedToNewUsersOnly_WithMatchingAudienceType_ReturnsTrue()
+    {
+        var model = new SubscriptionDiscountViewModel
+        {
+            AudienceType = DiscountAudienceType.UserHasNoPreviousSubscriptions
+        };
+
+        Assert.True(model.IsRestrictedToNewUsersOnly);
+    }
+
+    [Fact]
+    public void IsRestrictedToNewUsersOnly_WithAllUsersAudienceType_ReturnsFalse()
+    {
+        var model = new SubscriptionDiscountViewModel
+        {
+            AudienceType = DiscountAudienceType.AllUsers
+        };
+
+        Assert.False(model.IsRestrictedToNewUsersOnly);
+    }
+
+    [Fact]
+    public void IsAvailableToAllUsers_WithAllUsersAudienceType_ReturnsTrue()
+    {
+        var model = new SubscriptionDiscountViewModel
+        {
+            AudienceType = DiscountAudienceType.AllUsers
+        };
+
+        Assert.True(model.IsAvailableToAllUsers);
+    }
+
+    [Fact]
+    public void IsAvailableToAllUsers_WithRestrictedAudienceType_ReturnsFalse()
+    {
+        var model = new SubscriptionDiscountViewModel
+        {
+            AudienceType = DiscountAudienceType.UserHasNoPreviousSubscriptions
+        };
+
+        Assert.False(model.IsAvailableToAllUsers);
+    }
+
+    [Fact]
+    public void IsActive_WhenWithinDateRange_ReturnsTrue()
+    {
+        var model = new SubscriptionDiscountViewModel
+        {
+            StartDate = DateTime.UtcNow.AddDays(-1),
+            EndDate = DateTime.UtcNow.AddDays(1)
+        };
+
+        Assert.True(model.IsActive);
+    }
+
+    [Fact]
+    public void IsActive_WhenBeforeStartDate_ReturnsFalse()
+    {
+        var model = new SubscriptionDiscountViewModel
+        {
+            StartDate = DateTime.UtcNow.AddDays(1),
+            EndDate = DateTime.UtcNow.AddDays(2)
+        };
+
+        Assert.False(model.IsActive);
+    }
+
+    [Fact]
+    public void IsActive_WhenAfterEndDate_ReturnsFalse()
+    {
+        var model = new SubscriptionDiscountViewModel
+        {
+            StartDate = DateTime.UtcNow.AddDays(-2),
+            EndDate = DateTime.UtcNow.AddDays(-1)
+        };
+
+        Assert.False(model.IsActive);
+    }
+
+    [Fact]
+    public void IsActive_WhenExactlyOnStartDate_ReturnsTrue()
+    {
+        var now = DateTime.UtcNow;
+        var model = new SubscriptionDiscountViewModel
+        {
+            StartDate = now,
+            EndDate = now.AddDays(1)
+        };
+
+        Assert.True(model.IsActive);
+    }
+
+    [Fact]
+    public void IsActive_WhenCurrentTimeIsOnEndDate_ReturnsTrue()
+    {
+        var now = DateTime.UtcNow;
+        var model = new SubscriptionDiscountViewModel
+        {
+            StartDate = now.AddDays(-1),
+            EndDate = now.AddSeconds(1)
+        };
+
+        Assert.True(model.IsActive);
+    }
+}