using Akari.Prototype.Protos;
using Akari.Prototype.Server.Services;
using Akari.Prototype.Server.Utils;
using Google.Protobuf;
using Grpc.Core;
using Microsoft.Extensions.Logging;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;

namespace Akari.Prototype.Server
{
    public class AkariService : AkariApi.AkariApiBase
    {
        private readonly ILogger<AkariService> _logger;
        private readonly IApplicationsManager _applications;

        public AkariService(ILogger<AkariService> logger, IApplicationsManager applications)
        {
            _logger = logger;
            _applications = applications;
        }

        public override Task<DecryptResponse> Decrypt(DecryptRequest request, ServerCallContext context)
        {
            if (!_applications.Contains(request.Application))
            {
                return Task.FromResult(new DecryptResponse()
                {
                    ErrorMessage = "Application not found"
                });
            }

            if (!_applications.VerifyToken(request.Application, request.Token))
            {
                return Task.FromResult(new DecryptResponse()
                {
                    ErrorMessage = "Wrong token"
                });
            }

            if (_applications.TryRetrieveKey(request.Application, request.Token, out var key))
            {
                return Task.FromResult(new DecryptResponse()
                {
                    Plain = ByteString.CopyFrom(Security.AesGcmDecrypt(key, request.Encrypted.ToByteArray()))
                });
            }

            return Task.FromResult(new DecryptResponse()
            {
                ErrorMessage = "No fingerprint auth found for this application"
            });
        }

        public override Task<EncryptResponse> Encrypt(EncryptRequest request, ServerCallContext context)
        {
            if (!_applications.Contains(request.Application))
            {
                return Task.FromResult(new EncryptResponse()
                {
                    ErrorMessage = "Application not found"
                });
            }

            if (!_applications.VerifyToken(request.Application, request.Token))
            {
                return Task.FromResult(new EncryptResponse()
                {
                    ErrorMessage = "Wrong token"
                });
            }

            if (_applications.TryRetrieveKey(request.Application, request.Token, out var key))
            {
                return Task.FromResult(new EncryptResponse()
                {
                    Encrypted = ByteString.CopyFrom(Security.AesGcmEncrypt(key, request.Plain.ToByteArray()))
                });
            }

            return Task.FromResult(new EncryptResponse()
            {
                ErrorMessage = "No fingerprint auth found for this application"
            });
        }
    }
}