MoneyMap/MoneyMap.Tests/Services/CardServiceTests.cs

using MoneyMap.Models;
using MoneyMap.Services;
using MoneyMap.Tests.TestHelpers;
using Xunit;

namespace MoneyMap.Tests.Services;

public class CardServiceTests
{
    [Fact]
    public async Task GetAllCardsWithStatsAsync_ReturnsCardsWithTransactionCounts()
    {
        // Arrange
        using var context = DbContextHelper.CreateInMemoryContext();
        var service = new CardService(context);

        var account = new Account
        {
            Id = 1,
            Institution = "Test Bank",
            AccountType = AccountType.Checking,
            Last4 = "1234",
            Owner = "Test Owner"
        };
        context.Accounts.Add(account);

        var card1 = new Card
        {
            Id = 1,
            AccountId = 1,
            Issuer = "VISA",
            Last4 = "1111",
            Owner = "John Doe"
        };
        var card2 = new Card
        {
            Id = 2,
            AccountId = 1,
            Issuer = "Mastercard",
            Last4 = "2222",
            Owner = "Jane Smith"
        };
        context.Cards.AddRange(card1, card2);

        var transaction = new Transaction
        {
            Date = DateTime.Now,
            Amount = -50.00m,
            Name = "Test",
            Memo = "Test",
            AccountId = 1,
            CardId = 1
        };
        context.Transactions.Add(transaction);
        await context.SaveChangesAsync();

        // Act
        var result = await service.GetAllCardsWithStatsAsync();

        // Assert
        Assert.Equal(2, result.Count);
        var card1Stats = result.First(c => c.Card.Id == 1);
        Assert.Equal(1, card1Stats.TransactionCount);
        var card2Stats = result.First(c => c.Card.Id == 2);
        Assert.Equal(0, card2Stats.TransactionCount);
    }

    [Fact]
    public async Task CanDeleteCardAsync_ReturnsFalse_WhenCardHasTransactions()
    {
        // Arrange
        using var context = DbContextHelper.CreateInMemoryContext();
        var service = new CardService(context);

        var account = new Account
        {
            Id = 1,
            Institution = "Test Bank",
            AccountType = AccountType.Checking,
            Last4 = "1234",
            Owner = "Test Owner"
        };
        context.Accounts.Add(account);

        var card = new Card
        {
            Id = 1,
            AccountId = 1,
            Issuer = "VISA",
            Last4 = "9999",
            Owner = "Test Owner"
        };
        context.Cards.Add(card);

        var transaction = new Transaction
        {
            Date = DateTime.Now,
            Amount = -50.00m,
            Name = "Test",
            Memo = "Test",
            AccountId = 1,
            CardId = 1
        };
        context.Transactions.Add(transaction);
        await context.SaveChangesAsync();

        // Act
        var result = await service.CanDeleteCardAsync(1);

        // Assert
        Assert.False(result.CanDelete);
        Assert.Contains("transaction", result.Reason, StringComparison.OrdinalIgnoreCase);
    }

    [Fact]
    public async Task CanDeleteCardAsync_ReturnsTrue_WhenCardHasNoTransactions()
    {
        // Arrange
        using var context = DbContextHelper.CreateInMemoryContext();
        var service = new CardService(context);

        var account = new Account
        {
            Id = 1,
            Institution = "Test Bank",
            AccountType = AccountType.Checking,
            Last4 = "1234",
            Owner = "Test Owner"
        };
        context.Accounts.Add(account);

        var card = new Card
        {
            Id = 1,
            AccountId = 1,
            Issuer = "VISA",
            Last4 = "9999",
            Owner = "Test Owner"
        };
        context.Cards.Add(card);
        await context.SaveChangesAsync();

        // Act
        var result = await service.CanDeleteCardAsync(1);

        // Assert
        Assert.True(result.CanDelete);
    }

    [Fact]
    public async Task DeleteCardAsync_SuccessfullyDeletesCard_WhenNoTransactions()
    {
        // Arrange
        using var context = DbContextHelper.CreateInMemoryContext();
        var service = new CardService(context);

        var account = new Account
        {
            Id = 1,
            Institution = "Test Bank",
            AccountType = AccountType.Checking,
            Last4 = "1234",
            Owner = "Test Owner"
        };
        context.Accounts.Add(account);

        var card = new Card
        {
            Id = 1,
            AccountId = 1,
            Issuer = "VISA",
            Last4 = "9999",
            Owner = "Test Owner"
        };
        context.Cards.Add(card);
        await context.SaveChangesAsync();

        // Act
        var result = await service.DeleteCardAsync(1);

        // Assert
        Assert.True(result.Success);
        Assert.Empty(context.Cards);
    }

    [Fact]
    public async Task DeleteCardAsync_FailsToDelete_WhenCardHasTransactions()
    {
        // Arrange
        using var context = DbContextHelper.CreateInMemoryContext();
        var service = new CardService(context);

        var account = new Account
        {
            Id = 1,
            Institution = "Test Bank",
            AccountType = AccountType.Checking,
            Last4 = "1234",
            Owner = "Test Owner"
        };
        context.Accounts.Add(account);

        var card = new Card
        {
            Id = 1,
            AccountId = 1,
            Issuer = "VISA",
            Last4 = "9999",
            Owner = "Test Owner"
        };
        context.Cards.Add(card);

        var transaction = new Transaction
        {
            Date = DateTime.Now,
            Amount = -50.00m,
            Name = "Test",
            Memo = "Test",
            AccountId = 1,
            CardId = 1
        };
        context.Transactions.Add(transaction);
        await context.SaveChangesAsync();

        // Act
        var result = await service.DeleteCardAsync(1);

        // Assert
        Assert.False(result.Success);
        Assert.Single(context.Cards);
    }
}