using System;
using PanCardView.Enums;
using System.Collections.Generic;
using System.Linq;

namespace PanCardView.Utility
{
    public sealed class InteractionQueue
    {
        private readonly List<InteractionItem> _queue = new List<InteractionItem>();
        private readonly object _queueLocker = new object();

        public InteractionItem GetFirstItem(InteractionType type = InteractionType.User | InteractionType.Auto, InteractionState state = InteractionState.Regular | InteractionState.Removing)
        {
            lock (_queueLocker)
            {
                return _queue.FirstOrDefault(i => type.HasFlag(i.Type) && state.HasFlag(i.State));
            }
        }

        public void Add(Guid id, InteractionType type, InteractionState state = InteractionState.Regular)
        {
            lock (_queueLocker)
            {
                _queue.Add(InteractionItem.GetItem(id, type, state));
            }
        }

        public void Remove(Guid id)
        {
            lock (_queueLocker)
            {
                var item = _queue.FirstOrDefault(i => i.Id == id);
                _queue.Remove(InteractionItem.PutItem(item));
            }
        }

        public bool CheckLastId(Guid id, InteractionType type = InteractionType.User | InteractionType.Auto)
        {
            lock (_queueLocker)
            {
                return _queue.LastOrDefault(i => type.HasFlag(i.Type)).Id == id;
            }
        }
    }
}