Start refactor of backend

WretchedMachinesBackend/.gitignore

@@ -0,0 +1,484 @@
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WretchedMachinesBackend/Contracts/Data/CustomerDto.cs

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+namespace Customers.Api.Contracts.Data;
+
+public class CustomerDto
+{
+    public string Id { get; init; } = default!;
+
+    public string Username { get; init; } = default!;
+
+    public string FullName { get; init; } = default!;
+
+    public string Email { get; init; } = default!;
+
+    public DateTime DateOfBirth { get; init; }
+}

WretchedMachinesBackend/Contracts/Data/UserDto.cs

@@ -0,0 +1,16 @@
+namespace Users.Api.Contracts.Data;
+
+public class UserDto
+{
+    public string Id { get; init; } = default!;
+
+    public string Username { get; init; } = default!;
+
+    public string Email { get; init; } = default!;
+    
+    public byte[] PasswordHash { get; init; } = default!;
+
+    public DateTime Created { get; init; }
+
+    public DateTime Updated { get; init; }
+}

WretchedMachinesBackend/Contracts/Requests/CreateCustomerRequest.cs

@@ -0,0 +1,12 @@
+namespace Customers.Api.Contracts.Requests;
+
+public class CreateCustomerRequest
+{
+    public string Username { get; init; } = default!;
+
+    public string FullName { get; init; } = default!;
+
+    public string Email { get; init; } = default!;
+
+    public DateTime DateOfBirth { get; init; }
+}

WretchedMachinesBackend/Contracts/Requests/DeleteCustomerRequest.cs

@@ -0,0 +1,6 @@
+namespace Customers.Api.Contracts.Requests;
+
+public class DeleteCustomerRequest
+{
+    public Guid Id { get; init; }
+}

WretchedMachinesBackend/Contracts/Requests/GetCustomerRequest.cs

@@ -0,0 +1,6 @@
+namespace Customers.Api.Contracts.Requests;
+
+public class GetCustomerRequest
+{
+    public Guid Id { get; init; }
+}

WretchedMachinesBackend/Contracts/Requests/UpdateCustomerRequest.cs

@@ -0,0 +1,14 @@
+namespace Customers.Api.Contracts.Requests;
+
+public class UpdateCustomerRequest
+{
+    public Guid Id { get; init; }
+
+    public string Username { get; init; } = default!;
+
+    public string FullName { get; init; } = default!;
+
+    public string Email { get; init; } = default!;
+
+    public DateTime DateOfBirth { get; init; }
+}

WretchedMachinesBackend/Contracts/Responses/CustomerResponse.cs

@@ -0,0 +1,14 @@
+namespace Customers.Api.Contracts.Responses;
+
+public class CustomerResponse
+{
+    public Guid Id { get; init; }
+
+    public string Username { get; init; } = default!;
+
+    public string FullName { get; init; } = default!;
+
+    public string Email { get; init; } = default!;
+
+    public DateTime DateOfBirth { get; init; }
+}

WretchedMachinesBackend/Contracts/Responses/GetAllCustomersResponse.cs

@@ -0,0 +1,6 @@
+namespace Customers.Api.Contracts.Responses;
+
+public class GetAllCustomersResponse
+{
+    public IEnumerable<CustomerResponse> Customers { get; init; } = Enumerable.Empty<CustomerResponse>();
+}

WretchedMachinesBackend/Contracts/Responses/ValidationFailureResponse.cs

@@ -0,0 +1,6 @@
+namespace Customers.Api.Contracts.Responses;
+
+public class ValidationFailureResponse
+{
+    public List<string> Errors { get; init; } = new();
+}

WretchedMachinesBackend/Database/DatabaseInitializer.cs

@@ -0,0 +1,24 @@
+using Dapper;
+
+namespace Customers.Api.Database;
+
+public class DatabaseInitializer
+{
+    private readonly IDbConnectionFactory _connectionFactory;
+
+    public DatabaseInitializer(IDbConnectionFactory connectionFactory)
+    {
+        _connectionFactory = connectionFactory;
+    }
+
+    public async Task InitializeAsync()
+    {
+        using var connection = await _connectionFactory.CreateConnectionAsync();
+        await connection.ExecuteAsync(@"CREATE TABLE IF NOT EXISTS Customers (
+        Id CHAR(36) PRIMARY KEY, 
+        Username TEXT NOT NULL,
+        FullName TEXT NOT NULL,
+        Email TEXT NOT NULL,
+        DateOfBirth TEXT NOT NULL)");
+    }
+}

WretchedMachinesBackend/Database/DbConnectionFactory.cs

@@ -0,0 +1,26 @@
+using System.Data;
+using Microsoft.Data.Sqlite;
+
+namespace Customers.Api.Database;
+
+public interface IDbConnectionFactory
+{
+    public Task<IDbConnection> CreateConnectionAsync();
+}
+
+public class SqliteConnectionFactory : IDbConnectionFactory
+{
+    private readonly string _connectionString;
+
+    public SqliteConnectionFactory(string connectionString)
+    {
+        _connectionString = connectionString;
+    }
+
+    public async Task<IDbConnection> CreateConnectionAsync()
+    {
+        var connection = new SqliteConnection(_connectionString);
+        await connection.OpenAsync();
+        return connection;
+    }
+}

WretchedMachinesBackend/Domain/Common/CustomerId.cs

@@ -0,0 +1,14 @@
+using ValueOf;
+
+namespace Customers.Api.Domain.Common;
+
+public class CustomerId : ValueOf<Guid, CustomerId>
+{
+    protected override void Validate()
+    {
+        if (Value == Guid.Empty)
+        {
+            throw new ArgumentException("Customer Id cannot be empty", nameof(CustomerId));
+        }
+    }
+}

WretchedMachinesBackend/Domain/Common/DateOfBirth.cs

@@ -0,0 +1,20 @@
+using FluentValidation;
+using FluentValidation.Results;
+using ValueOf;
+
+namespace Customers.Api.Domain.Common;
+
+public class DateOfBirth : ValueOf<DateOnly, DateOfBirth>
+{
+    protected override void Validate()
+    {
+        if (Value > DateOnly.FromDateTime(DateTime.Now))
+        {
+            const string message = "Your date of birth cannot be in the future";
+            throw new ValidationException(message, new []
+            {
+                new ValidationFailure(nameof(DateOfBirth), message)
+            });
+        }
+    }
+}

WretchedMachinesBackend/Domain/Common/EmailAddress.cs

@@ -0,0 +1,25 @@
+using System.Text.RegularExpressions;
+using FluentValidation;
+using FluentValidation.Results;
+using ValueOf;
+
+namespace Customers.Api.Domain.Common;
+
+public class EmailAddress : ValueOf<string, EmailAddress>
+{
+    private static readonly Regex EmailRegex =
+        new("^[\\w!#$%&’*+/=?`{|}~^-]+(?:\\.[\\w!#$%&’*+/=?`{|}~^-]+)*@(?:[a-zA-Z0-9-]+\\.)+[a-zA-Z]{2,6}$",
+            RegexOptions.Compiled | RegexOptions.IgnoreCase);
+
+    protected override void Validate()
+    {
+        if (!EmailRegex.IsMatch(Value))
+        {
+            var message = $"{Value} is not a valid email address";
+            throw new ValidationException(message, new []
+            {
+                new ValidationFailure(nameof(EmailAddress), message)
+            });
+        }
+    }
+}

WretchedMachinesBackend/Domain/Common/FullName.cs

@@ -0,0 +1,24 @@
+using System.Text.RegularExpressions;
+using FluentValidation;
+using FluentValidation.Results;
+using ValueOf;
+
+namespace Customers.Api.Domain.Common;
+
+public class FullName : ValueOf<string, FullName>
+{
+    private static readonly Regex FullNameRegex =
+        new("^[a-z ,.'-]+$", RegexOptions.Compiled | RegexOptions.IgnoreCase);
+
+    protected override void Validate()
+    {
+        if (!FullNameRegex.IsMatch(Value))
+        {
+            var message = $"{Value} is not a valid full name";
+            throw new ValidationException(message, new []
+            {
+                new ValidationFailure(nameof(FullName), message)
+            });
+        }
+    }
+}

WretchedMachinesBackend/Domain/Common/Username.cs

@@ -0,0 +1,24 @@
+using System.Text.RegularExpressions;
+using FluentValidation;
+using FluentValidation.Results;
+using ValueOf;
+
+namespace Customers.Api.Domain.Common;
+
+public class Username : ValueOf<string, Username>
+{
+    private static readonly Regex UsernameRegex =
+        new("^[a-z\\d](?:[a-z\\d]|-(?=[a-z\\d])){0,38}$", RegexOptions.Compiled | RegexOptions.IgnoreCase);
+
+    protected override void Validate()
+    {
+        if (!UsernameRegex.IsMatch(Value))
+        {
+            var message = $"{Value} is not a valid username";
+            throw new ValidationException(message, new []
+            {
+                new ValidationFailure(nameof(Username), message)
+            });
+        }
+    }
+}

WretchedMachinesBackend/Domain/Customer.cs

@@ -0,0 +1,16 @@
+using Customers.Api.Domain.Common;
+
+namespace Customers.Api.Domain;
+
+public class Customer
+{
+    public CustomerId Id { get; init; } = CustomerId.From(Guid.NewGuid());
+
+    public Username Username { get; init; } = default!;
+
+    public FullName FullName { get; init; } = default!;
+
+    public EmailAddress Email { get; init; } = default!;
+
+    public DateOfBirth DateOfBirth { get; init; } = default!;
+}

WretchedMachinesBackend/Endpoints/CreateCustomerEndpoint.cs

@@ -0,0 +1,30 @@
+using Customers.Api.Contracts.Requests;
+using Customers.Api.Contracts.Responses;
+using Customers.Api.Mapping;
+using Customers.Api.Services;
+using FastEndpoints;
+using Microsoft.AspNetCore.Authorization;
+
+namespace Customers.Api.Endpoints;
+
+[HttpPost("customers"), AllowAnonymous]
+public class CreateCustomerEndpoint : Endpoint<CreateCustomerRequest, CustomerResponse>
+{
+    private readonly ICustomerService _customerService;
+
+    public CreateCustomerEndpoint(ICustomerService customerService)
+    {
+        _customerService = customerService;
+    }
+
+    public override async Task HandleAsync(CreateCustomerRequest req, CancellationToken ct)
+    {
+        var customer = req.ToCustomer();
+
+        await _customerService.CreateAsync(customer);
+
+        var customerResponse = customer.ToCustomerResponse();
+        await SendCreatedAtAsync<GetCustomerEndpoint>(
+            new { Id = customer.Id.Value }, customerResponse, generateAbsoluteUrl: true, cancellation: ct);
+    }
+}

WretchedMachinesBackend/Endpoints/DeleteCustomerEndpoint.cs

@@ -0,0 +1,29 @@
+using Customers.Api.Contracts.Requests;
+using Customers.Api.Services;
+using FastEndpoints;
+using Microsoft.AspNetCore.Authorization;
+
+namespace Customers.Api.Endpoints;
+
+[HttpDelete("customers/{id:guid}"), AllowAnonymous]
+public class DeleteCustomerEndpoint : Endpoint<DeleteCustomerRequest>
+{
+    private readonly ICustomerService _customerService;
+
+    public DeleteCustomerEndpoint(ICustomerService customerService)
+    {
+        _customerService = customerService;
+    }
+
+    public override async Task HandleAsync(DeleteCustomerRequest req, CancellationToken ct)
+    {
+        var deleted = await _customerService.DeleteAsync(req.Id);
+        if (!deleted)
+        {
+            await SendNotFoundAsync(ct);
+            return;
+        }
+
+        await SendNoContentAsync(ct);
+    }
+}

WretchedMachinesBackend/Endpoints/GetAllCustomersEndpoint.cs

@@ -0,0 +1,25 @@
+using Customers.Api.Contracts.Responses;
+using Customers.Api.Mapping;
+using Customers.Api.Services;
+using FastEndpoints;
+using Microsoft.AspNetCore.Authorization;
+
+namespace Customers.Api.Endpoints;
+
+[HttpGet("customers"), AllowAnonymous]
+public class GetAllCustomersEndpoint : EndpointWithoutRequest<GetAllCustomersResponse>
+{
+    private readonly ICustomerService _customerService;
+
+    public GetAllCustomersEndpoint(ICustomerService customerService)
+    {
+        _customerService = customerService;
+    }
+
+    public override async Task HandleAsync(CancellationToken ct)
+    {
+        var customers = await _customerService.GetAllAsync();
+        var customersResponse = customers.ToCustomersResponse();
+        await SendOkAsync(customersResponse, ct);
+    }
+}

WretchedMachinesBackend/Endpoints/GetCustomerEndpoint.cs

@@ -0,0 +1,33 @@
+using Customers.Api.Contracts.Requests;
+using Customers.Api.Contracts.Responses;
+using Customers.Api.Mapping;
+using Customers.Api.Services;
+using FastEndpoints;
+using Microsoft.AspNetCore.Authorization;
+
+namespace Customers.Api.Endpoints;
+
+[HttpGet("customers/{id:guid}"), AllowAnonymous]
+public class GetCustomerEndpoint : Endpoint<GetCustomerRequest, CustomerResponse>
+{
+    private readonly ICustomerService _customerService;
+
+    public GetCustomerEndpoint(ICustomerService customerService)
+    {
+        _customerService = customerService;
+    }
+
+    public override async Task HandleAsync(GetCustomerRequest req, CancellationToken ct)
+    {
+        var customer = await _customerService.GetAsync(req.Id);
+
+        if (customer is null)
+        {
+            await SendNotFoundAsync(ct);
+            return;
+        }
+
+        var customerResponse = customer.ToCustomerResponse();
+        await SendOkAsync(customerResponse, ct);
+    }
+}

WretchedMachinesBackend/Endpoints/UpdateCustomerEndpoint.cs

@@ -0,0 +1,36 @@
+using Customers.Api.Contracts.Requests;
+using Customers.Api.Contracts.Responses;
+using Customers.Api.Mapping;
+using Customers.Api.Services;
+using FastEndpoints;
+using Microsoft.AspNetCore.Authorization;
+
+namespace Customers.Api.Endpoints;
+
+[HttpPut("customers/{id:guid}"), AllowAnonymous]
+public class UpdateCustomerEndpoint : Endpoint<UpdateCustomerRequest, CustomerResponse>
+{
+    private readonly ICustomerService _customerService;
+
+    public UpdateCustomerEndpoint(ICustomerService customerService)
+    {
+        _customerService = customerService;
+    }
+
+    public override async Task HandleAsync(UpdateCustomerRequest req, CancellationToken ct)
+    {
+        var existingCustomer = await _customerService.GetAsync(req.Id);
+
+        if (existingCustomer is null)
+        {
+            await SendNotFoundAsync(ct);
+            return;
+        }
+
+        var customer = req.ToCustomer();
+        await _customerService.UpdateAsync(customer);
+
+        var customerResponse = customer.ToCustomerResponse();
+        await SendOkAsync(customerResponse, ct);
+    }
+}

WretchedMachinesBackend/Mapping/ApiContractToDomainMapper.cs

@@ -0,0 +1,32 @@
+using Customers.Api.Contracts.Requests;
+using Customers.Api.Domain;
+using Customers.Api.Domain.Common;
+
+namespace Customers.Api.Mapping;
+
+public static class ApiContractToDomainMapper
+{
+    public static Customer ToCustomer(this CreateCustomerRequest request)
+    {
+        return new Customer
+        {
+            Id = CustomerId.From(Guid.NewGuid()),
+            Email = EmailAddress.From(request.Email),
+            Username = Username.From(request.Username),
+            FullName = FullName.From(request.FullName),
+            DateOfBirth = DateOfBirth.From(DateOnly.FromDateTime(request.DateOfBirth))
+        };
+    }
+
+    public static Customer ToCustomer(this UpdateCustomerRequest request)
+    {
+        return new Customer
+        {
+            Id = CustomerId.From(request.Id),
+            Email = EmailAddress.From(request.Email),
+            Username = Username.From(request.Username),
+            FullName = FullName.From(request.FullName),
+            DateOfBirth = DateOfBirth.From(DateOnly.FromDateTime(request.DateOfBirth))
+        };
+    }
+}

WretchedMachinesBackend/Mapping/DomainToApiContractMapper.cs

@@ -0,0 +1,34 @@
+using Customers.Api.Contracts.Responses;
+using Customers.Api.Domain;
+
+namespace Customers.Api.Mapping;
+
+public static class DomainToApiContractMapper
+{
+    public static CustomerResponse ToCustomerResponse(this Customer customer)
+    {
+        return new CustomerResponse
+        {
+            Id = customer.Id.Value,
+            Email = customer.Email.Value,
+            Username = customer.Username.Value,
+            FullName = customer.FullName.Value,
+            DateOfBirth = customer.DateOfBirth.Value.ToDateTime(TimeOnly.MinValue)
+        };
+    }
+
+    public static GetAllCustomersResponse ToCustomersResponse(this IEnumerable<Customer> customers)
+    {
+        return new GetAllCustomersResponse
+        {
+            Customers = customers.Select(x => new CustomerResponse
+            {
+                Id = x.Id.Value,
+                Email = x.Email.Value,
+                Username = x.Username.Value,
+                FullName = x.FullName.Value,
+                DateOfBirth = x.DateOfBirth.Value.ToDateTime(TimeOnly.MinValue)
+            })
+        };
+    }
+}

WretchedMachinesBackend/Mapping/DomainToDtoMapper.cs

@@ -0,0 +1,19 @@
+using Customers.Api.Contracts.Data;
+using Customers.Api.Domain;
+
+namespace Customers.Api.Mapping;
+
+public static class DomainToDtoMapper
+{
+    public static CustomerDto ToCustomerDto(this Customer customer)
+    {
+        return new CustomerDto
+        {
+            Id = customer.Id.Value.ToString(),
+            Email = customer.Email.Value,
+            Username = customer.Username.Value,
+            FullName = customer.FullName.Value,
+            DateOfBirth = customer.DateOfBirth.Value.ToDateTime(TimeOnly.MinValue)
+        };
+    }
+}

WretchedMachinesBackend/Mapping/DtoToDomainMapper.cs

@@ -0,0 +1,20 @@
+using Customers.Api.Contracts.Data;
+using Customers.Api.Domain;
+using Customers.Api.Domain.Common;
+
+namespace Customers.Api.Mapping;
+
+public static class DtoToDomainMapper
+{
+    public static Customer ToCustomer(this CustomerDto customerDto)
+    {
+        return new Customer
+        {
+            Id = CustomerId.From(Guid.Parse(customerDto.Id)),
+            Email = EmailAddress.From(customerDto.Email),
+            Username = Username.From(customerDto.Username),
+            FullName = FullName.From(customerDto.FullName),
+            DateOfBirth = DateOfBirth.From(DateOnly.FromDateTime(customerDto.DateOfBirth))
+        };
+    }
+}

WretchedMachinesBackend/Program.cs

@@ -0,0 +1,44 @@
+var builder = WebApplication.CreateBuilder(args);
+
+// Add services to the container.
+// Learn more about configuring Swagger/OpenAPI at https://aka.ms/aspnetcore/swashbuckle
+builder.Services.AddEndpointsApiExplorer();
+builder.Services.AddSwaggerGen();
+
+var app = builder.Build();
+
+// Configure the HTTP request pipeline.
+if (app.Environment.IsDevelopment())
+{
+    app.UseSwagger();
+    app.UseSwaggerUI();
+}
+
+app.UseHttpsRedirection();
+
+var summaries = new[]
+{
+    "Freezing", "Bracing", "Chilly", "Cool", "Mild", "Warm", "Balmy", "Hot", "Sweltering", "Scorching"
+};
+
+app.MapGet("/weatherforecast", () =>
+{
+    var forecast =  Enumerable.Range(1, 5).Select(index =>
+        new WeatherForecast
+        (
+            DateOnly.FromDateTime(DateTime.Now.AddDays(index)),
+            Random.Shared.Next(-20, 55),
+            summaries[Random.Shared.Next(summaries.Length)]
+        ))
+        .ToArray();
+    return forecast;
+})
+.WithName("GetWeatherForecast")
+.WithOpenApi();
+
+app.Run();
+
+record WeatherForecast(DateOnly Date, int TemperatureC, string? Summary)
+{
+    public int TemperatureF => 32 + (int)(TemperatureC / 0.5556);
+}

WretchedMachinesBackend/Properties/launchSettings.json

@@ -0,0 +1,41 @@
+{
+  "$schema": "http://json.schemastore.org/launchsettings.json",
+  "iisSettings": {
+    "windowsAuthentication": false,
+    "anonymousAuthentication": true,
+    "iisExpress": {
+      "applicationUrl": "http://localhost:63472",
+      "sslPort": 44301
+    }
+  },
+  "profiles": {
+    "http": {
+      "commandName": "Project",
+      "dotnetRunMessages": true,
+      "launchBrowser": true,
+      "launchUrl": "swagger",
+      "applicationUrl": "http://localhost:5190",
+      "environmentVariables": {
+        "ASPNETCORE_ENVIRONMENT": "Development"
+      }
+    },
+    "https": {
+      "commandName": "Project",
+      "dotnetRunMessages": true,
+      "launchBrowser": true,
+      "launchUrl": "swagger",
+      "applicationUrl": "https://localhost:7119;http://localhost:5190",
+      "environmentVariables": {
+        "ASPNETCORE_ENVIRONMENT": "Development"
+      }
+    },
+    "IIS Express": {
+      "commandName": "IISExpress",
+      "launchBrowser": true,
+      "launchUrl": "swagger",
+      "environmentVariables": {
+        "ASPNETCORE_ENVIRONMENT": "Development"
+      }
+    }
+  }
+}

WretchedMachinesBackend/Repositories/CustomerRepository.cs

@@ -0,0 +1,56 @@
+using Customers.Api.Contracts.Data;
+using Customers.Api.Database;
+using Dapper;
+
+namespace Customers.Api.Repositories;
+
+public class CustomerRepository : ICustomerRepository
+{
+    private readonly IDbConnectionFactory _connectionFactory;
+
+    public CustomerRepository(IDbConnectionFactory connectionFactory)
+    {
+        _connectionFactory = connectionFactory;
+    }
+
+    public async Task<bool> CreateAsync(CustomerDto customer)
+    {
+        using var connection = await _connectionFactory.CreateConnectionAsync();
+        var result = await connection.ExecuteAsync(
+            @"INSERT INTO Customers (Id, Username, FullName, Email, DateOfBirth) 
+            VALUES (@Id, @Username, @FullName, @Email, @DateOfBirth)",
+            customer);
+        return result > 0;
+    }
+
+    public async Task<CustomerDto?> GetAsync(Guid id)
+    {
+        using var connection = await _connectionFactory.CreateConnectionAsync();
+        return await connection.QuerySingleOrDefaultAsync<CustomerDto>(
+            "SELECT * FROM Customers WHERE Id = @Id LIMIT 1", new { Id = id.ToString() });
+    }
+
+    public async Task<IEnumerable<CustomerDto>> GetAllAsync()
+    {
+        using var connection = await _connectionFactory.CreateConnectionAsync();
+        return await connection.QueryAsync<CustomerDto>("SELECT * FROM Customers");
+    }
+
+    public async Task<bool> UpdateAsync(CustomerDto customer)
+    {
+        using var connection = await _connectionFactory.CreateConnectionAsync();
+        var result = await connection.ExecuteAsync(
+            @"UPDATE Customers SET Username = @Username, FullName = @FullName, Email = @Email, 
+                 DateOfBirth = @DateOfBirth WHERE Id = @Id",
+            customer);
+        return result > 0;
+    }
+
+    public async Task<bool> DeleteAsync(Guid id)
+    {
+        using var connection = await _connectionFactory.CreateConnectionAsync();
+        var result = await connection.ExecuteAsync(@"DELETE FROM Customers WHERE Id = @Id",
+            new {Id = id.ToString()});
+        return result > 0;
+    }
+}

WretchedMachinesBackend/Repositories/ICustomerRepository.cs

@@ -0,0 +1,16 @@
+using Customers.Api.Contracts.Data;
+
+namespace Customers.Api.Repositories;
+
+public interface ICustomerRepository
+{
+    Task<bool> CreateAsync(CustomerDto customer);
+
+    Task<CustomerDto?> GetAsync(Guid id);
+
+    Task<IEnumerable<CustomerDto>> GetAllAsync();
+
+    Task<bool> UpdateAsync(CustomerDto customer);
+
+    Task<bool> DeleteAsync(Guid id);
+}

WretchedMachinesBackend/Services/CustomerService.cs

@@ -0,0 +1,56 @@
+using Customers.Api.Domain;
+using Customers.Api.Mapping;
+using Customers.Api.Repositories;
+using FluentValidation;
+using FluentValidation.Results;
+
+namespace Customers.Api.Services;
+
+public class CustomerService : ICustomerService
+{
+    private readonly ICustomerRepository _customerRepository;
+
+    public CustomerService(ICustomerRepository customerRepository)
+    {
+        _customerRepository = customerRepository;
+    }
+
+    public async Task<bool> CreateAsync(Customer customer)
+    {
+        var existingUser = await _customerRepository.GetAsync(customer.Id.Value);
+        if (existingUser is not null)
+        {
+            var message = $"A user with id {customer.Id} already exists";
+            throw new ValidationException(message, new []
+            {
+                new ValidationFailure(nameof(Customer), message)
+            });
+        }
+
+        var customerDto = customer.ToCustomerDto();
+        return await _customerRepository.CreateAsync(customerDto);
+    }
+
+    public async Task<Customer?> GetAsync(Guid id)
+    {
+        var customerDto = await _customerRepository.GetAsync(id);
+        return customerDto?.ToCustomer();
+    }
+
+    public async Task<IEnumerable<Customer>> GetAllAsync()
+    {
+        var customerDtos = await _customerRepository.GetAllAsync();
+        return customerDtos.Select(x => x.ToCustomer());
+    }
+
+    public async Task<bool> UpdateAsync(Customer customer)
+    {
+        var customerDto = customer.ToCustomerDto();
+        return await _customerRepository.UpdateAsync(customerDto);
+    }
+
+    public async Task<bool> DeleteAsync(Guid id)
+    {
+        return await _customerRepository.DeleteAsync(id);
+    }
+}

WretchedMachinesBackend/Services/ICustomerService.cs

@@ -0,0 +1,16 @@
+using Customers.Api.Domain;
+
+namespace Customers.Api.Services;
+
+public interface ICustomerService
+{
+    Task<bool> CreateAsync(Customer customer);
+
+    Task<Customer?> GetAsync(Guid id);
+
+    Task<IEnumerable<Customer>> GetAllAsync();
+
+    Task<bool> UpdateAsync(Customer customer);
+
+    Task<bool> DeleteAsync(Guid id);
+}

WretchedMachinesBackend/Summaries/CreateCustomerSummary.cs

@@ -0,0 +1,16 @@
+using Customers.Api.Contracts.Responses;
+using Customers.Api.Endpoints;
+using FastEndpoints;
+
+namespace Customers.Api.Summaries;
+
+public class CreateCustomerSummary : Summary<CreateCustomerEndpoint>
+{
+    public CreateCustomerSummary()
+    {
+        Summary = "Creates a new customer in the system";
+        Description = "Creates a new customer in the system";
+        Response<CustomerResponse>(201, "Customer was successfully created");
+        Response<ValidationFailureResponse>(400, "The request did not pass validation checks");
+    }
+}

WretchedMachinesBackend/Summaries/DeleteCustomerSummary.cs

@@ -0,0 +1,15 @@
+using Customers.Api.Endpoints;
+using FastEndpoints;
+
+namespace Customers.Api.Summaries;
+
+public class DeleteCustomerSummary : Summary<DeleteCustomerEndpoint>
+{
+    public DeleteCustomerSummary()
+    {
+        Summary = "Deleted a customer the system";
+        Description = "Deleted a customer the system";
+        Response(204, "The customer was deleted successfully");
+        Response(404, "The customer was not found in the system");
+    }
+}

WretchedMachinesBackend/Summaries/GetAllCustomersSummary.cs

@@ -0,0 +1,15 @@
+using Customers.Api.Contracts.Responses;
+using Customers.Api.Endpoints;
+using FastEndpoints;
+
+namespace Customers.Api.Summaries;
+
+public class GetAllCustomersSummary : Summary<GetAllCustomersEndpoint>
+{
+    public GetAllCustomersSummary()
+    {
+        Summary = "Returns all the customers in the system";
+        Description = "Returns all the customers in the system";
+        Response<GetAllCustomersResponse>(200, "All customers in the system are returned");
+    }
+}

WretchedMachinesBackend/Summaries/GetCustomerSummary.cs

@@ -0,0 +1,16 @@
+using Customers.Api.Contracts.Responses;
+using Customers.Api.Endpoints;
+using FastEndpoints;
+
+namespace Customers.Api.Summaries;
+
+public class GetCustomerSummary : Summary<GetCustomerEndpoint>
+{
+    public GetCustomerSummary()
+    {
+        Summary = "Returns a single customer by id";
+        Description = "Returns a single customer by id";
+        Response<GetAllCustomersResponse>(200, "Successfully found and returned the customer");
+        Response(404, "The customer does not exist in the system");
+    }
+}

WretchedMachinesBackend/Summaries/UpdateCustomerSummary.cs

@@ -0,0 +1,16 @@
+using Customers.Api.Contracts.Responses;
+using Customers.Api.Endpoints;
+using FastEndpoints;
+
+namespace Customers.Api.Summaries;
+
+public class UpdateCustomerSummary : Summary<UpdateCustomerEndpoint>
+{
+    public UpdateCustomerSummary()
+    {
+        Summary = "Updates an existing customer in the system";
+        Description = "Updates an existing customer in the system";
+        Response<CustomerResponse>(201, "Customer was successfully updated");
+        Response<ValidationFailureResponse>(400, "The request did not pass validation checks");
+    }
+}

WretchedMachinesBackend/Validation/CreateCustomerRequestValidator.cs

@@ -0,0 +1,15 @@
+using Customers.Api.Contracts.Requests;
+using FluentValidation;
+
+namespace Customers.Api.Validation;
+
+public class CreateCustomerRequestValidator : AbstractValidator<CreateCustomerRequest>
+{
+    public CreateCustomerRequestValidator()
+    {
+        RuleFor(x => x.FullName).NotEmpty();
+        RuleFor(x => x.Email).NotEmpty();
+        RuleFor(x => x.Username).NotEmpty();
+        RuleFor(x => x.DateOfBirth).NotEmpty();
+    }
+}

WretchedMachinesBackend/Validation/UpdateCustomerRequestValidator.cs

@@ -0,0 +1,15 @@
+using Customers.Api.Contracts.Requests;
+using FluentValidation;
+
+namespace Customers.Api.Validation;
+
+public class UpdateCustomerRequestValidator : AbstractValidator<UpdateCustomerRequest>
+{
+    public UpdateCustomerRequestValidator()
+    {
+        RuleFor(x => x.FullName).NotEmpty();
+        RuleFor(x => x.Email).NotEmpty();
+        RuleFor(x => x.Username).NotEmpty();
+        RuleFor(x => x.DateOfBirth).NotEmpty();
+    }
+}

WretchedMachinesBackend/Validation/ValidationExceptionMiddleware.cs

@@ -0,0 +1,32 @@
+using Customers.Api.Contracts.Responses;
+using FluentValidation;
+
+namespace Customers.Api.Validation;
+
+public class ValidationExceptionMiddleware
+{
+    private readonly RequestDelegate _request;
+
+    public ValidationExceptionMiddleware(RequestDelegate request)
+    {
+        _request = request;
+    }
+
+    public async Task InvokeAsync(HttpContext context)
+    {
+        try
+        {
+            await _request(context);
+        }
+        catch (ValidationException exception)
+        {
+            context.Response.StatusCode = 400;
+            var messages = exception.Errors.Select(x => x.ErrorMessage).ToList();
+            var validationFailureResponse = new ValidationFailureResponse
+            {
+                Errors = messages
+            };
+            await context.Response.WriteAsJsonAsync(validationFailureResponse);
+        }
+    }
+}

WretchedMachinesBackend/WretchedMachinesBackend.csproj

@@ -0,0 +1,24 @@
+<Project Sdk="Microsoft.NET.Sdk.Web">
+
+  <PropertyGroup>
+    <TargetFramework>net8.0</TargetFramework>
+    <Nullable>enable</Nullable>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <InvariantGlobalization>true</InvariantGlobalization>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <PackageReference Include="Dapper" Version="2.1.35" />
+    <PackageReference Include="FastEndpoints" Version="5.26.0" />
+    <PackageReference Include="FastEndpoints.Swagger" Version="5.26.0" />
+    <PackageReference Include="Microsoft.AspNetCore.OpenApi" Version="8.0.0" />
+    <PackageReference Include="Microsoft.Data.Sqlite" Version="8.0.6" />
+    <PackageReference Include="Swashbuckle.AspNetCore" Version="6.4.0" />
+    <PackageReference Include="ValueOf" Version="2.0.31" />
+  </ItemGroup>
+
+  <ItemGroup>
+    <ProjectReference Include="..\DataAccess\DataAccess.csproj" />
+  </ItemGroup>
+
+</Project>

WretchedMachinesBackend/WretchedMachinesBackend.http

@@ -0,0 +1,6 @@
+@WretchedMachinesBackend_HostAddress = http://localhost:5190
+
+GET {{WretchedMachinesBackend_HostAddress}}/weatherforecast/
+Accept: application/json
+
+###

WretchedMachinesBackend/WretchedMachinesBackend.sln

@@ -0,0 +1,25 @@
+
+Microsoft Visual Studio Solution File, Format Version 12.00
+# Visual Studio Version 17
+VisualStudioVersion = 17.5.002.0
+MinimumVisualStudioVersion = 10.0.40219.1
+Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "WretchedMachinesBackend", "WretchedMachinesBackend.csproj", "{A9D8EB0B-C828-47D2-99ED-94ABF8BB3D75}"
+EndProject
+Global
+	GlobalSection(SolutionConfigurationPlatforms) = preSolution
+		Debug|Any CPU = Debug|Any CPU
+		Release|Any CPU = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(ProjectConfigurationPlatforms) = postSolution
+		{A9D8EB0B-C828-47D2-99ED-94ABF8BB3D75}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{A9D8EB0B-C828-47D2-99ED-94ABF8BB3D75}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{A9D8EB0B-C828-47D2-99ED-94ABF8BB3D75}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{A9D8EB0B-C828-47D2-99ED-94ABF8BB3D75}.Release|Any CPU.Build.0 = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(SolutionProperties) = preSolution
+		HideSolutionNode = FALSE
+	EndGlobalSection
+	GlobalSection(ExtensibilityGlobals) = postSolution
+		SolutionGuid = {4B866C14-5893-473B-AD16-A48F3F277F01}
+	EndGlobalSection
+EndGlobal

WretchedMachinesBackend/appsettings.Development.json

@@ -0,0 +1,8 @@
+{
+  "Logging": {
+    "LogLevel": {
+      "Default": "Information",
+      "Microsoft.AspNetCore": "Warning"
+    }
+  }
+}

WretchedMachinesBackend/appsettings.json

@@ -0,0 +1,9 @@
+{
+  "Logging": {
+    "LogLevel": {
+      "Default": "Information",
+      "Microsoft.AspNetCore": "Warning"
+    }
+  },
+  "AllowedHosts": "*"
+}