using System;
using System.Collections.Generic;
using JD.Collections.Interfaces;
using JD.TeaBoxAddinSystem.Addins.Description.Conditions;

namespace JD.TeaBoxAddinSystem.Addins.Description
{
    /// <summary>
    /// Defines an <see cref="ExtensionNode"/> in an <see cref="ExtensionPoint"/>.
    /// </summary>
    public sealed class ExtensionNodeDescription : NodeDescription
    {
        #region Variables

        private const string AnonymousId = "<anonymous>";

        internal const string IdAttributeName = "id";
        internal const string InsertAfterAttributeName = "insertafter";
        internal const string InsertBeforeAttributeName = "insertbefore";
                
        private readonly ExtensionNodeDescriptionCollection m_childNodes = new ExtensionNodeDescriptionCollection();
        private readonly AddinObjectCollection<ConditionInfo> m_conditions = new AddinObjectCollection<ConditionInfo>();
        
        #endregion

        #region Constructor

        /// <summary>
        /// Constructor.
        /// </summary>
        /// <param name="name"></param>
        public ExtensionNodeDescription(string name)
            : base(name)
        {
        }

        #endregion

        #region Properties
        
        /// <summary>
        /// Child Nodes.
        /// </summary>
        public IKeyedList<string, ExtensionNodeDescription> ChildNodes
        {
            get
            {
                return m_childNodes;
            }
        }

        /// <summary>
        /// Conditions that affect this node.
        /// </summary>
        public IList<ConditionInfo> Conditions
        {
            get
            {
                return m_conditions;
            }
        }

        /// <summary>
        /// Id.
        /// </summary>
        public string Id
        {
            get
            {
                return Attributes[IdAttributeName];
            }
            set
            {
                Attributes[IdAttributeName] = value;
            }
        }

        /// <summary>
        /// Id to display in error messages.
        /// </summary>
        internal string DisplayId
        {
            get
            {
                string id = Id;
                if (!string.IsNullOrEmpty(id))
                {
                    return id;
                }
                return AnonymousId;
            }
        }

        /// <summary>
        /// Gets/Sets the extension node Ids (comma separated) that this node should be inserted after.
        /// </summary>
        /// <remarks>
        /// This is no guarantee. If there is circular dependency between the nodes, this order will probably not be respected
        /// </remarks>
        public string InsertAfter
        {
            get
            {
                return Attributes[InsertAfterAttributeName];
            }
            set
            {
                Attributes[InsertAfterAttributeName] = value;
            }
        }

        /// <summary>
        /// Gets/Sets the extension node Ids (comma separated) that this node should be inserted before.
        /// </summary>
        /// <remarks>
        /// This is no guarantee. If there is circular dependency between the nodes, this order will probably not be respected
        /// </remarks>
        public string InsertBefore
        {
            get
            {
                return Attributes[InsertBeforeAttributeName];
            }
            set
            {
                Attributes[InsertBeforeAttributeName] = value;
            }
        }

        #endregion

        #region Methods

        /// <summary>
        /// Overriden.
        /// </summary>
        /// <param name="e"></param>
        internal override void OnModuleChanged(EventArgs e)
        {
            m_childNodes.Owner = Module;
            m_conditions.Owner = Module;
            base.OnModuleChanged(e);
        }

        /// <summary>
        /// Overriden.
        /// </summary>
        /// <returns></returns>
        public override string ToString()
        {
            return
                $"[ExtensionNodeDescription ({Name}): Id={(string.IsNullOrEmpty(Id) ? AnonymousId : Id)}, {ChildNodes.Count} child nodes, {Conditions.Count} conditions]";
        }

        #endregion
    }
}