using MongoDB.Entities;

using PrivaPub.Federation.Actors;
using PrivaPub.Models.Federation;
using PrivaPub.Models.Group;

using GroupEntity = PrivaPub.Models.Group.Group;

namespace PrivaPub.Federation.Inbox
{
	public static class ForeignMembers
	{
		public static async Task<bool> IsAcceptedFollower(LocalActor group, string actorUri, CancellationToken token) =>
			await DB.Default.Find<Follower>()
				.Match(f => f.LocalActorId == group.Id && f.LocalActorKind == LocalActorKind.Group && f.ActorURI == actorUri && f.IsAccepted)
				.ExecuteAnyAsync(token);

		public static async Task AddForeignMember(string groupId, string actorUri, CancellationToken token)
		{
			var group = await DB.Default.Find<GroupEntity>().MatchID(groupId).ExecuteFirstAsync(token);
			if (group == default || group.Members.Any(m => m.IsForeign && m.AvatarId == actorUri))
				return;
			group.Members.Add(new GroupMember { AvatarId = actorUri, IsForeign = true });
			group.UpdatedAt = DateTime.UtcNow;
			await DB.Default.SaveAsync(group, token);
		}

		public static async Task RemoveForeignMember(string groupId, string actorUri, CancellationToken token)
		{
			var group = await DB.Default.Find<GroupEntity>().MatchID(groupId).ExecuteFirstAsync(token);
			if (group == default || group.Members.RemoveAll(m => m.IsForeign && m.AvatarId == actorUri) == 0)
				return;
			group.UpdatedAt = DateTime.UtcNow;
			await DB.Default.SaveAsync<GroupEntity>(group, token);
		}
	}
}