using System;
using System.Linq;
using System.Resources;
using JD.Kernel.StaticHelpers;

namespace JD.TeaBoxAddinSystem.Addins.Description.FileReferences
{
    /// <summary>
    /// A reference to a resource file embedded in an assembly.
    /// </summary>
    public class AssemblyResourceFileReference : ResourceFileReference
    {
        #region Variables

        private AssemblyFileReference m_owner;

        #endregion

        #region Constructor

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

        #endregion

        #region Properties

        /// <summary>
        /// Owner of this resource file reference.
        /// </summary>
        /// <remarks>
        /// Set automatically when adding an <see cref="AssemblyResourceFileReference"/> to an <see cref="AssemblyFileReference"/>.
        /// </remarks>
        public AssemblyFileReference Owner
        {
            get
            {
                return m_owner;
            }
            internal set
            {
                Throw.InvalidOperationIf(m_owner != null && value != null, "This AssemblyResourceFileReference is already owned by another AssemblyFileReference.");
                m_owner = value;
            }
        }

        #endregion

        #region Methods

        /// <summary>
        /// Overriden.
        /// </summary>
        /// <returns></returns>
        protected override ResourceManager LoadImpl()
        {
            if (Owner != null && Owner.Runtime.Assembly != null)
            {
                string baseName = Filename;
                if (baseName.EndsWith(ResourcesExtension, StringComparison.Ordinal))
                {
                    baseName = baseName.Substring(0, baseName.Length - ResourcesExtension.Length);
                }

                var assembly = Owner.Runtime.Assembly;
                var existingResources = assembly.GetManifestResourceNames();
                if (!existingResources.Contains(baseName + ResourcesExtension, StringComparer.OrdinalIgnoreCase))
                {
                    throw new InvalidProgramException(
                        $"Could not find any resource named {baseName + ResourcesExtension} in assembly {assembly.FullName}. Available resources are: '{string.Join(", ", existingResources)}'");
                }

                return new ResourceManager(baseName, assembly);
            }
            return null;
        }

        #endregion
    }
}