/*
 * Cluster - Implements a simple cluster
 *
 * Author: Phillip Piper
 * Date: 3-March-2011 10:53 pm
 *
 * Change log:
 * 2011-03-03  JPP  - First version
 * 
 * Copyright (C) 2011-2014 Phillip Piper
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 *
 * If you wish to use this code in a closed source application, please contact phillip.piper@gmail.com.
 */

using System;

namespace BrightIdeasSoftware {

    /// <summary>
    /// Concrete implementation of the ICluster interface.
    /// </summary>
    public class Cluster : ICluster {

        #region Life and death

        /// <summary>
        /// Create a cluster
        /// </summary>
        /// <param name="key">The key for the cluster</param>
        public Cluster(object key) {
            this.Count = 1;
            this.ClusterKey = key;
        }

        #endregion

        #region Public overrides

        /// <summary>
        /// Return a string representation of this cluster
        /// </summary>
        /// <returns></returns>
        public override string ToString() {
            return this.DisplayLabel ?? "[empty]";
        }

        #endregion

        #region Implementation of ICluster

        /// <summary>
        /// Gets or sets how many items belong to this cluster
        /// </summary>
        public int Count {
            get { return count; }
            set { count = value; }
        }
        private int count;

        /// <summary>
        /// Gets or sets the label that will be shown to the user to represent
        /// this cluster
        /// </summary>
        public string DisplayLabel {
            get { return displayLabel; }
            set { displayLabel = value; }
        }
        private string displayLabel;

        /// <summary>
        /// Gets or sets the actual data object that all members of this cluster
        /// have commonly returned.
        /// </summary>
        public object ClusterKey {
            get { return clusterKey; }
            set { clusterKey = value; }
        }
        private object clusterKey;

        #endregion

        #region Implementation of IComparable

        /// <summary>
        /// Return an indication of the ordering between this object and the given one
        /// </summary>
        /// <param name="other"></param>
        /// <returns></returns>
        public int CompareTo(object other) {
            if (other == null || other == System.DBNull.Value)
                return 1;

            if (other is not ICluster otherCluster)
                return 1;

            if (this.ClusterKey is string keyAsString)
                return String.Compare(keyAsString, otherCluster.ClusterKey as string, StringComparison.CurrentCultureIgnoreCase);

            if (this.ClusterKey is IComparable keyAsComparable)
                return keyAsComparable.CompareTo(otherCluster.ClusterKey);

            return -1;
        }

        #endregion
    }
}
