using System.Collections.Generic;

namespace AIPractice.Shared.Labels
{
    public enum GroupType
    {
        Image = 0,
        Roi =1,
        All = 2,
    }

    public abstract class LabelGroup : LabelObject
    {
        private RootLabel _root;

        /// <summary>
        /// Gets the group type.
        /// </summary>
        public GroupType Type { get; set; }

        /// <summary>
        /// Gets the labels belongs to this group.
        /// </summary>
        public IReadOnlyList<ImageLabel> Labels { get; }

        /// <summary>
        /// Gets or sets the root of this group
        /// </summary>
        public RootLabel Root
        {
            get => _root;
            set
            {
                if (_root != value)
                {
                    _root = value;
                    foreach(var label in Labels)
                    {
                        label.Root = _root;
                    }
                }
            }
        }


        protected LabelGroup(string id, string title, GroupType type, IEnumerable<ImageLabel> labels) : base(id, title)
        {
            Type = type;
            var list = new List<ImageLabel>(labels);
            Labels = list;
        }

        /// <summary>
        /// Add one label into the group.
        /// </summary>
        /// <param name="label">The label to be added. and the root label will be assigned to the label.</param>
        public void AddLabel(ImageLabel label)
        {
            var labelList = (List<ImageLabel>)Labels;
            if(!labelList.Contains(label))
            {
                labelList.Add(label);
                label.Root = _root;
            }
        }

        /// <summary>
        /// Remove the lable from the group.
        /// </summary>
        /// <param name="label">The label to be removed.</param>
        public void RemoveLabel(ImageLabel label)
        {
            var labelList = (List<ImageLabel>)Labels;
            if(labelList.Contains(label))
            {
                labelList.Remove(label);
            }   
        }

        /// <summary>
        /// Insert one label into the group on given index.
        /// </summary>
        /// <param name="index">The index to be insert.</param>
        /// <param name="label">The label to be added. and the root label will be assigned to the label.</param>
        public void InsertLabel(int index, ImageLabel label)
        {
            var labelList = (List<ImageLabel>)Labels;
            if (!labelList.Contains(label))
            {
                labelList.Insert(index,label);
                label.Root = _root;
            }
        }
    }
}