using FileService.Domain.Events;
using FileService.Domain.ValueObjects;
using IM.DomainCommons;

namespace FileService.Domain.Entities
{
    public class UploadTask:AggregateRootEntity
    {
        public Guid UploaderId { get; private set; }
        public Guid ConversationId { get; private set; }
        public string? ChatType { get; private set; }
        public Guid? TargetId { get; private set; }
        public FileName FileName { get; private set; }
        public long FileSize { get; private set; }
        public ContentType ContentType { get; private set; }
        public StorageLocation StorageLocation { get; private set; }
        public UploadTaskState State { get; private set; }
        public CheckSum CheckSum { get; private set; }
        public Guid? ResultFileId { get; private set; }
        public string? FailureReason { get; private set; }

        private UploadTask() { }

        public UploadTask(Guid uploaderId, Guid conversationId, string? chatType, Guid? targetId, FileName fileName, long fileSize, ContentType contentType, StorageLocation? storageLocation, CheckSum checkSum)
        {
            UploaderId = uploaderId;
            ConversationId = conversationId;
            ChatType = chatType?.ToUpperInvariant();
            TargetId = targetId;
            FileName = fileName;
            FileSize = fileSize;
            ContentType = contentType;
            StorageLocation = storageLocation ?? new StorageLocation();
            CheckSum = checkSum;
        }

        public void StartUpload(StorageLocation? location = null)
        {
            if (location != null) StorageLocation = location; State = UploadTaskState.Uploading;
        }

        public void StartMerging(StorageLocation location)
        {
            StorageLocation = location;
            State = UploadTaskState.Merging;
            FailureReason = null;
            NotifyModified();
        }

        public void CompleteUpload(Guid fileId)
        {
            ResultFileId = fileId;
            State = UploadTaskState.Completed;
            FailureReason = null;
            NotifyModified();
            AddDomainEvent(new UploadTaskCompletedDomainEvent(this));
        }

        public void Fail(string reason)
        {
            State = UploadTaskState.Failed;
            FailureReason = reason.Length > 500 ? reason[..500] : reason;
            NotifyModified();
        }
    }
}