List<Request> requests = new()
{
    new Request() { Uuid= Guid.Parse("a1b5c571-a859-4bb8-9fd2-7431ddd6c464"), Title = "Дополнительное соглашение на расценку", Student = "Иванов Иван Иванович", DateAgreement = new DateTime(2023, 7, 01), AgreementValid = true },
    new Request() { Uuid= Guid.Parse("53d08f8c-19f5-4028-8e92-520470c8f747"), Title = "Дополнительное соглашение на продление срока проживания", Student = "Петров Петр Петрович", DateAgreement = new DateTime(2023, 5, 01), AgreementValid = false },
};

var builder = WebApplication.CreateBuilder(args);

builder.Services.AddEndpointsApiExplorer();
builder.Services.AddSwaggerGen();

var app = builder.Build();

if (app.Environment.IsDevelopment())
{
    app.UseSwagger();
    app.UseSwaggerUI();
}

app.UseHttpsRedirection();

app.MapGet("/", () =>
{
    return requests.Select(r => new RequestEntityDto()
    {
        Uuid = r.Uuid,
        Title = r.Title,
        DateAgreement = r.DateAgreement,
        Student = r.Student,
        AgreementValid = r.AgreementValid,
    });
})
.WithName("GetRequests")
.WithOpenApi();

app.MapGet("/{uuid}", (Guid uuid) =>
{
    var request = requests.FirstOrDefault(r => r.Uuid == uuid);
    if (request == null)
        return Results.NotFound();
    return Results.Json(new RequestEntityDto()
    {
        Uuid = request.Uuid,
        Title = request.Title,
        DateAgreement = request.DateAgreement,
        Student = request.Student,
        AgreementValid = request.AgreementValid,
    });
})
.WithName("GetRequestByGUID")
.WithOpenApi();

app.MapPost("/{title}/{Student}/{DateAgreement}/{AgreementValid}", (string title, string Student, DateTime DateAgreement, bool AgreementValid) =>
{
    Guid NewGuid = Guid.NewGuid();
    requests.Add(new Request() { Uuid = NewGuid, Title = (string)title, Student = (string)Student, DateAgreement = (DateTime)DateAgreement, AgreementValid = (bool)AgreementValid });

    var request = requests.FirstOrDefault(r => r.Uuid == NewGuid);
    if (request == null)
        return Results.NotFound();
    return Results.Json(new RequestEntityDto()
    {
        Uuid = request.Uuid,
        Title = request.Title,
        DateAgreement = request.DateAgreement,
        Student = request.Student,
        AgreementValid = request.AgreementValid,
    });
})
.WithName("PostRequest")
.WithOpenApi();

app.MapPatch("/{uuid}/{title}/{Student}/{DateAgreement}/{AgreementValid}", (Guid uuid, string? title, string? Student, DateTime DateAgreement, bool AgreementValid) =>
{
    var request = requests.FirstOrDefault(r => r.Uuid == uuid);
    if (request == null)
        return Results.NotFound();
    if (title != null) request.Title = title;
    if (Student != ",") request.Student = Student;
    if (DateAgreement != request.DateAgreement) request.DateAgreement = DateAgreement;
    if (AgreementValid != request.AgreementValid) request.AgreementValid = AgreementValid;

    return Results.Json(new RequestEntityDto()
    {
        Uuid = request.Uuid,
        Title = request.Title,
        DateAgreement = request.DateAgreement,
        Student = request.Student,
        AgreementValid = request.AgreementValid,
    });
})
.WithName("UpdateRequest")
.WithOpenApi();

app.MapDelete("/{uuid}", (Guid uuid) =>
{
    var request = requests.FirstOrDefault(r => r.Uuid == uuid);
    if (request == null)
        return Results.NotFound();
    requests.Remove(request);
    return Results.Json(new RequestEntityDto()
    {
        Uuid = request.Uuid,
        Title = request.Title,
        DateAgreement = request.DateAgreement,
        Student = request.Student,
        AgreementValid = request.AgreementValid,
    });
})
.WithName("DeleteRequestByGUID")
.WithOpenApi();

app.Run();

public class Request
{
    public Guid Uuid { get; set; }
    public string Title { get; set; } = string.Empty;
    public string Student { get; set; } = string.Empty;
    public DateTime DateAgreement { get; set; }
    public bool AgreementValid { get; set; }
}

public class RequestEntityDto : Request { }