using MongoDB.Driver;
using MongoDB.Entities;

using PrivaPub.Models.Social;

namespace PrivaPub.Domain.Social
{
	public static class Notifications
	{
		public static async Task Add(string avatarId, NotificationType type, string fromAccountId, string fromActorUri, string postId,
			CancellationToken token, string emoji = default, string emojiUrl = default, string text = default)
		{
			if (string.IsNullOrEmpty(avatarId) || avatarId == fromAccountId && type != NotificationType.Poll)
				return;
			if ((await Relationships.Hidden.AuthorsHiddenFrom(avatarId, new[] { fromActorUri }, forNotifications: true, token)).Count > 0)
				return;
			var action = await NotificationPolicies.Judge(avatarId, type, fromAccountId, fromActorUri, postId, token);
			if (action == NotificationAction.Drop)
				return;
			try
			{
				var notification = new Notification
				{
					AvatarId = avatarId,
					Type = type,
					FromAccountId = fromAccountId,
					FromActorURI = fromActorUri,
					PostId = postId,
					Emoji = emoji,
					EmojiURL = emojiUrl,
					Text = text,
					DedupeKey = emoji == default ? $"{type}|{avatarId}|{fromActorUri}|{postId}" : $"{type}|{avatarId}|{fromActorUri}|{postId}|{emoji}",
					Filtered = action == NotificationAction.Filter
				};
				await DB.Default.SaveAsync(notification, token);
				// filtered: in its account's request, told to no stream
				if (notification.Filtered)
				{
					await NotificationPolicies.Requested(notification, token);
					return;
				}
				var told = new Timelines.Streams.Event("notification", notification.ID);
				Timelines.Streams.ToPersona(avatarId, new Timelines.Streams.Key(Timelines.Streams.User), told);
				Timelines.Streams.ToPersona(avatarId, new Timelines.Streams.Key(Timelines.Streams.UserNotification), told);
			}
			catch (MongoWriteException ex) when (ex.WriteError?.Category == ServerErrorCategory.DuplicateKey)
			{
			}
		}
	}
}