using JD.LogService;
using JD.TeaBoxAddinSystem.Addins.Description;
using JD.TeaBoxAddinSystem.Addins.Internal;

namespace JD.TeaBoxAddinSystem.Addins
{
    /// <summary>
    /// A lazy-obtained resource.
    /// </summary>
    public class LazyResourceReference<T> : LazyReference<T>
    {
        #region Constructor

        /// <summary>
        /// Constructor.
        /// </summary>
        /// <param name="node"></param>
        /// <param name="resourcename"></param>
        public LazyResourceReference(Node node, string resourcename)
            : base(node, resourcename)
        { }

        #endregion
    
        #region Methods

        /// <summary>
        /// Creates the value.
        /// </summary>
        /// <param name="resources"></param>
        /// <param name="resourceName"></param>
        /// <returns></returns>
        protected virtual T CreateValue(IResources resources, string resourceName)
        {
            return (T)resources.GetObject(resourceName);
        }

        /// <summary>
        /// Creates an instance from the module.
        /// </summary>
        /// <returns></returns>
        protected override T LoadValue()
        {
            T value = CreateValue(Node.Module.Resources, ResourceName);
            if (ReferenceEquals(value, null))
            {
                AddinManager.Log(new Error(LogCategory.Error, "Unable to create the resource named '{0}'.", ResourceName) { Origin = FileLocation });
            }
            return value;
        }

        #endregion       
    }
}