using DysonNetwork.Shared.Proto;
using Grpc.Core;
using NodaTime;
using Duration = NodaTime.Duration;

namespace DysonNetwork.Drive.Storage
{
    public class FileReferenceServiceGrpc(FileReferenceService fileReferenceService)
        : Shared.Proto.FileReferenceService.FileReferenceServiceBase
    {
        public override async Task<Shared.Proto.CloudFileReference> CreateReference(CreateReferenceRequest request,
            ServerCallContext context)
        {
            Instant? expiredAt = null;
            if (request.ExpiredAt != null)
                expiredAt = Instant.FromUnixTimeSeconds(request.ExpiredAt.Seconds);
            else if (request.Duration != null)
                expiredAt = SystemClock.Instance.GetCurrentInstant() +
                            Duration.FromTimeSpan(request.Duration.ToTimeSpan());

            var reference = await fileReferenceService.CreateReferenceAsync(
                request.FileId,
                request.Usage,
                request.ResourceId,
                expiredAt
            );
            return reference.ToProtoValue();
        }

        public override async Task<GetReferencesResponse> GetReferences(GetReferencesRequest request,
            ServerCallContext context)
        {
            var references = await fileReferenceService.GetReferencesAsync(request.FileId);
            var response = new GetReferencesResponse();
            response.References.AddRange(references.Select(r => r.ToProtoValue()));
            return response;
        }

        public override async Task<GetReferenceCountResponse> GetReferenceCount(GetReferenceCountRequest request,
            ServerCallContext context)
        {
            var count = await fileReferenceService.GetReferenceCountAsync(request.FileId);
            return new GetReferenceCountResponse { Count = count };
        }

        public override async Task<GetReferencesResponse> GetResourceReferences(GetResourceReferencesRequest request,
            ServerCallContext context)
        {
            var references = await fileReferenceService.GetResourceReferencesAsync(request.ResourceId, request.Usage);
            var response = new GetReferencesResponse();
            response.References.AddRange(references.Select(r => r.ToProtoValue()));
            return response;
        }

        public override async Task<GetResourceFilesResponse> GetResourceFiles(GetResourceFilesRequest request,
            ServerCallContext context)
        {
            var files = await fileReferenceService.GetResourceFilesAsync(request.ResourceId, request.Usage);
            var response = new GetResourceFilesResponse();
            response.Files.AddRange(files.Select(f => f.ToProtoValue()));
            return response;
        }

        public override async Task<DeleteResourceReferencesResponse> DeleteResourceReferences(
            DeleteResourceReferencesRequest request, ServerCallContext context)
        {
            var deletedCount = 0;
            if (request.Usage is null)
                deletedCount = await fileReferenceService.DeleteResourceReferencesAsync(request.ResourceId);
            else
                deletedCount =
                    await fileReferenceService.DeleteResourceReferencesAsync(request.ResourceId, request.Usage!);
            return new DeleteResourceReferencesResponse { DeletedCount = deletedCount };
        }

        public override async Task<DeleteReferenceResponse> DeleteReference(DeleteReferenceRequest request,
            ServerCallContext context)
        {
            var success = await fileReferenceService.DeleteReferenceAsync(Guid.Parse(request.ReferenceId));
            return new DeleteReferenceResponse { Success = success };
        }

        public override async Task<UpdateResourceFilesResponse> UpdateResourceFiles(UpdateResourceFilesRequest request,
            ServerCallContext context)
        {
            Instant? expiredAt = null;
            if (request.ExpiredAt != null)
            {
                expiredAt = Instant.FromUnixTimeSeconds(request.ExpiredAt.Seconds);
            }
            else if (request.Duration != null)
            {
                expiredAt = SystemClock.Instance.GetCurrentInstant() +
                            Duration.FromTimeSpan(request.Duration.ToTimeSpan());
            }

            var references = await fileReferenceService.UpdateResourceFilesAsync(
                request.ResourceId,
                request.FileIds,
                request.Usage,
                expiredAt
            );
            var response = new UpdateResourceFilesResponse();
            response.References.AddRange(references.Select(r => r.ToProtoValue()));
            return response;
        }

        public override async Task<SetReferenceExpirationResponse> SetReferenceExpiration(
            SetReferenceExpirationRequest request, ServerCallContext context)
        {
            Instant? expiredAt = null;
            if (request.ExpiredAt != null)
            {
                expiredAt = Instant.FromUnixTimeSeconds(request.ExpiredAt.Seconds);
            }
            else if (request.Duration != null)
            {
                expiredAt = SystemClock.Instance.GetCurrentInstant() +
                            Duration.FromTimeSpan(request.Duration.ToTimeSpan());
            }

            var success =
                await fileReferenceService.SetReferenceExpirationAsync(Guid.Parse(request.ReferenceId), expiredAt);
            return new SetReferenceExpirationResponse { Success = success };
        }

        public override async Task<SetFileReferencesExpirationResponse> SetFileReferencesExpiration(
            SetFileReferencesExpirationRequest request, ServerCallContext context)
        {
            var expiredAt = Instant.FromUnixTimeSeconds(request.ExpiredAt.Seconds);
            var updatedCount = await fileReferenceService.SetFileReferencesExpirationAsync(request.FileId, expiredAt);
            return new SetFileReferencesExpirationResponse { UpdatedCount = updatedCount };
        }

        public override async Task<HasFileReferencesResponse> HasFileReferences(HasFileReferencesRequest request,
            ServerCallContext context)
        {
            var hasReferences = await fileReferenceService.HasFileReferencesAsync(request.FileId);
            return new HasFileReferencesResponse { HasReferences = hasReferences };
        }
    }
}