using System.Threading.Tasks;

using BirdsiteLive.DAL.Contracts;

namespace BirdsiteLive.Domain.BusinessUseCases
{
    public interface IProcessFollowUser
    {
        Task ExecuteAsync(
            string followerUsername,
            string followerDomain,
            string twitterUsername,
            string followerInbox,
            string sharedInbox,
            string followerActorId
        );
    }

    public class ProcessFollowUser : IProcessFollowUser
    {
        private readonly IFollowersDal _followerDal;
        private readonly ITwitterUserDal _twitterUserDal;

        #region Ctor
        public ProcessFollowUser(IFollowersDal followerDal, ITwitterUserDal twitterUserDal)
        {
            _followerDal = followerDal;
            _twitterUserDal = twitterUserDal;
        }
        #endregion

        public async Task ExecuteAsync(
            string followerUsername,
            string followerDomain,
            string twitterUsername,
            string followerInbox,
            string sharedInbox,
            string followerActorId
        )
        {
            // Get Follower and Twitter Users
            var follower = await _followerDal.GetFollowerAsync(followerUsername, followerDomain);
            if (follower == null)
            {
                await _followerDal.CreateFollowerAsync(
                    followerUsername,
                    followerDomain,
                    followerInbox,
                    sharedInbox,
                    followerActorId
                );
                follower = await _followerDal.GetFollowerAsync(followerUsername, followerDomain);
            }

            var twitterUser = await _twitterUserDal.GetTwitterUserAsync(twitterUsername);
            if (twitterUser == null)
            {
                await _twitterUserDal.CreateTwitterUserAsync(twitterUsername, -1);
                twitterUser = await _twitterUserDal.GetTwitterUserAsync(twitterUsername);
            }

            // Update Follower
            var twitterUserId = twitterUser.Id;
            if (!follower.Followings.Contains(twitterUserId))
                follower.Followings.Add(twitterUserId);

            if (!follower.FollowingsSyncStatus.ContainsKey(twitterUserId))
                follower.FollowingsSyncStatus.Add(twitterUserId, -1);

            // Save Follower
            await _followerDal.UpdateFollowerAsync(follower);
        }
    }
}