using Hutopy.Infrastructure.Security;
using Hutopy.Modules.Identity.Configuration;
using Hutopy.Modules.Identity.Data;
using Microsoft.Extensions.Options;

namespace Hutopy.Modules.Identity.Handlers;

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

[PublicAPI]
public record RegisterResponse(
    string AccessToken,
    string RefreshToken);

[PublicAPI]
public class RegisterHandler(
    UserManager userManager,
    IOptionsSnapshot<JwtOptions> jwtOptions)
    : 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
        var existingUser = await userManager.FindByEmailAsync(request.Email);
        if (existingUser is not null)
        {
            await SendStringAsync(
                "A user with this email already exists",
                400,
                cancellation: ct);
            return;
        }

        // Create a refresh token
        var refreshToken = RefreshTokenGenerator.Next();
        
        // Split the name into firstname and lastname (if provided)
        var nameParts = request.Name.Split(' ', 2);
        var firstname = nameParts[0];
        var lastname = nameParts.Length > 1 ? nameParts[1] : string.Empty;

        // Create a new user
        var user = new User
        {
            UserName = request.Email,
            Email = request.Email,
            Firstname = firstname,
            Lastname = lastname,
            Alias = request.Name,
            RefreshToken = refreshToken,
            RefreshTokenExpiryTime = DateTime.UtcNow.Add(jwtOptions.Value.RefreshTokenLifetime)
        };

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

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

        // Generate JWT token
        var accessToken = JwtTokenHelper.GenerateJwtToken(
            expiresIn: jwtOptions.Value.Lifetime,
            issuer: jwtOptions.Value.Issuer,
            audience: jwtOptions.Value.Audience,
            key: jwtOptions.Value.Key,
            userId: user.Id.ToString(),
            email: user.Email ?? string.Empty,
            alias: user.Alias,
            firstname: user.Firstname ?? string.Empty,
            lastname: user.Lastname ?? string.Empty,
            portraitUrl: user.PortraitUrl);

        await SendOkAsync(
            new RegisterResponse(accessToken, user.RefreshToken),
            cancellation: ct);
    }
}