using System;
using System.Runtime.Serialization;
using Umbraco.Cms.Core.Models.Entities;

namespace Umbraco.Cms.Core.Models
{
    /// <summary>
    /// Represents a Relation between two items
    /// </summary>
    [Serializable]
    [DataContract(IsReference = true)]
    public class Relation : EntityBase, IRelation
    {
        //NOTE: The datetime column from umbracoRelation is set on CreateDate on the Entity
        private int _parentId;
        private int _childId;
        private IRelationType _relationType;
        private string _comment;

        /// <summary>
        /// Constructor for constructing the entity to be created
        /// </summary>
        /// <param name="parentId"></param>
        /// <param name="childId"></param>
        /// <param name="relationType"></param>
        public Relation(int parentId, int childId, IRelationType relationType)
        {
            _parentId = parentId;
            _childId = childId;
            _relationType = relationType;
        }

        /// <summary>
        /// Constructor for reconstructing the entity from the data source
        /// </summary>
        /// <param name="parentId"></param>
        /// <param name="childId"></param>
        /// <param name="parentObjectType"></param>
        /// <param name="childObjectType"></param>
        /// <param name="relationType"></param>
        public Relation(int parentId, int childId, Guid parentObjectType, Guid childObjectType, IRelationType relationType)
        {
            _parentId = parentId;
            _childId = childId;
            _relationType = relationType;
            ParentObjectType = parentObjectType;
            ChildObjectType = childObjectType;
        }


        /// <summary>
        /// Gets or sets the Parent Id of the Relation (Source)
        /// </summary>
        [DataMember]
        public int ParentId
        {
            get => _parentId;
            set => SetPropertyValueAndDetectChanges(value, ref _parentId, nameof(ParentId));
        }

        [DataMember]
        public Guid ParentObjectType { get; set; }

        /// <summary>
        /// Gets or sets the Child Id of the Relation (Destination)
        /// </summary>
        [DataMember]
        public int ChildId
        {
            get => _childId;
            set => SetPropertyValueAndDetectChanges(value, ref _childId, nameof(ChildId));
        }

        [DataMember]
        public Guid ChildObjectType { get; set; }

        /// <summary>
        /// Gets or sets the <see cref="RelationType"/> for the Relation
        /// </summary>
        [DataMember]
        public IRelationType RelationType
        {
            get => _relationType;
            set => SetPropertyValueAndDetectChanges(value, ref _relationType, nameof(RelationType));
        }

        /// <summary>
        /// Gets or sets a comment for the Relation
        /// </summary>
        [DataMember]
        public string Comment
        {
            get => _comment;
            set => SetPropertyValueAndDetectChanges(value, ref _comment, nameof(Comment));
        }

        /// <summary>
        /// Gets the Id of the <see cref="RelationType"/> that this Relation is based on.
        /// </summary>
        [IgnoreDataMember]
        public int RelationTypeId => _relationType.Id;
    }
}