using Hutopy.Modules.Identity.Data;
using Hutopy.Modules.Identity.Services;
using Microsoft.AspNetCore.Identity;

namespace Hutopy.Modules.Identity.Handlers;

[PublicAPI]
public record RegisterRequest(
    string Email,
    string Password,
    string Name);

[PublicAPI]
public record RegisterResponse(
    string Message);

[PublicAPI]
public class RegisterHandler(
    UserManager userManager,
    EmailVerificationService emailVerificationService)
    : Endpoint<RegisterRequest, RegisterResponse>
{
    public override void Configure()
    {
        AllowAnonymous();
        Post("/api/users/register");
        Options(o => o.WithTags("Users"));
    }

    public override async Task HandleAsync(
        RegisterRequest request,
        CancellationToken ct)
    {
        // Check if the user already exists
        User? existingUser = await userManager.FindByEmailAsync(request.Email);
        if (existingUser is not null)
        {
            await SendStringAsync(
                "A user with this email already exists",
                400,
                cancellation: ct);
            return;
        }

        // Split the name into firstname and lastname (if provided)
        string[] nameParts = request.Name.Split(' ', 2);
        string firstname = nameParts[0];
        string lastname = nameParts.Length > 1 ? nameParts[1] : string.Empty;

        // Create a new user
        User user = new()
        {
            UserName = request.Email,
            Email = request.Email,
            Firstname = firstname,
            Lastname = lastname,
            Alias = request.Name
        };

        IdentityResult result = await userManager.CreateAsync(
            user,
            request.Password);

        if (!result.Succeeded)
        {
            await SendStringAsync(
                result.Errors.First().Description,
                400,
                cancellation: ct);
            return;
        }

        await emailVerificationService.SendVerificationEmailAsync(user);

        await SendOkAsync(
            new RegisterResponse("Registration successful! Please check your email to verify your account."),
            ct);
    }
}