using AutoMapper;
using MediatR;
using mws.backend.dotnet.application.Common;
using mws.backend.dotnet.application.Users;

namespace mws.backend.dotnet.application.Auth;

public record LoginCommand(LoginRequest Request) : IRequest<LoginResponse>;

public class LoginHandler(IUnitOfWork uow, IPasswordHasher passwordHasher, ITokenService tokenService, IMapper mapper)
    : IRequestHandler<LoginCommand, LoginResponse>
{
    public async Task<LoginResponse> Handle(LoginCommand command, CancellationToken ct)
    {
        var username = command.Request.Username.Trim();
        var user = await uow.Users.GetByUsernameWithRoleAsync(username, ct);

        if (user is null || !passwordHasher.Verify(command.Request.Password, user.PasswordHash))
        {
            throw new UnauthorizedException("Invalid username or password");
        }

        if (!user.IsActive)
        {
            throw new ForbiddenException("Account disabled");
        }

        return new LoginResponse
        {
            Token = tokenService.CreateToken(user.Id, user.Username),
            User = mapper.Map<UserDto>(user),
        };
    }
}