using BlackRock.Reporting.API.Authentication;
using BlackRock.Reporting.API.Core.Models;
using BlackRock.Reporting.API.Mediator.AuthenticationMediator.Models;
using BlackRock.Reporting.API.Mediator.UserMediator.Model;
using MediatR;
using Microsoft.AspNetCore.Identity;

namespace BlackRock.Reporting.API.Mediator.AuthenticationMediator.Commands
{
    public class RefreshCommand : CredentialsCommand, IRequest<Result<CredentialsCommand>>
    {
    }

    public class RefreshCommandHandlers : IRequestHandler<RefreshCommand, Result<CredentialsCommand>>
    {
        private readonly ILogger<RefreshCommand> logger;
        private readonly IJwtManager jwtManager;
        private readonly IRefreshTokenManager refreshTokenManager;
        private readonly UserManager<ApplicationUser> userManager;

        public RefreshCommandHandlers(ILogger<RefreshCommand> logger, IJwtManager jwtManager, IRefreshTokenManager refreshTokenManager, UserManager<ApplicationUser> userManager)
        {
            this.logger = logger;
            this.jwtManager = jwtManager;
            this.refreshTokenManager = refreshTokenManager;
            this.userManager = userManager;
        }
        public async Task<Result<CredentialsCommand>> Handle(RefreshCommand command, CancellationToken cancellationToken)
        {
            if (command is null)
                throw new ArgumentException($"Parameter {nameof(command)} must not be null");

            try
            {
                var userName = jwtManager.GetUserName(command.JwtToken);

                var user = await userManager.FindByNameAsync(userName);

                if (!(await refreshTokenManager.ValidateRefreshToken(user, command.RefreshToken)))
                    throw new UnauthorizedAccessException("Invalid token");

                var token = jwtManager.GenerateToken(userName);

                if (token == null)
                    throw new UnauthorizedAccessException("Token is not valid");

                return new Result<CredentialsCommand>
                {
                    Data = new CredentialsCommand
                    {
                        JwtToken = token,
                        RefreshToken = command.RefreshToken
                    }
                };
            }
            catch (Exception ex)
            {
                logger.LogError(ex, "Faild to add data to DB.");
                return new Result<CredentialsCommand> { IsSuccess = false, Error = "Faild to add data to DB." };
            }
        }
    }
}