using System;
using JD.Kernel.StaticHelpers;
using JD.Kernel.Structs;
using JD.LogService;

namespace JD.TeaBoxAddinSystem.Addins.Description
{
    /// <summary>
    /// An object that is owned by a particular module of an <see cref="Addin"/>.
    /// </summary>
    public abstract class AddinObject
    {
        #region Variables

        private Module m_module;
        private FileLocation? m_fileLocation;

        #endregion
        
        #region Properties

        /// <summary>
        /// Addin that owns this object. Can be null.
        /// </summary>
        public Addin Addin
        {
            get
            {
                if (Module == null)
                {
                    return null;
                }

                return Module.GetAddin();
            }
        }

        /// <summary>
        /// Module that owns this object. Can be null.
        /// </summary>
        public Module Module
        {
            get
            {
                return m_module;
            }
            internal set
            {
                if (m_module != value)
                {
                    Throw.InvalidOperationIf(m_module != null && value != null, "Addin object already belongs to another module.");
                    m_module = value;
                    OnModuleChanged(EventArgs.Empty);
                }
            }
        }

        /// <summary>
        /// Location where this element is defined, if any.
        /// </summary>
        public FileLocation? FileLocation
        {
            get
            {
                return m_fileLocation;
            }
            set
            {
                ThrowIfLoaded();
                m_fileLocation = value;
            }
        }

        #endregion

        #region Methods

        /// <summary>
        /// Throws an <see cref="InvalidOperationException"/> if loaded.
        /// </summary>
        internal void ThrowIfLoaded()
        {
            if (Addin != null)
            {
                Addin.ThrowIfLoaded();
            }
        }

        /// <summary>
        /// GetAddin.
        /// </summary>
        /// <returns></returns>
        internal virtual Addin GetAddin()
        {
            return null;
        }

        /// <summary>
        /// Called when the <see cref="Addin"/> that owns this object changes.
        /// </summary>
        /// <param name="e"></param>
        internal virtual void OnModuleChanged(EventArgs e)
        {
        }

        #region Logging

        internal void LogError(string msg, params object[] args)
        {
            LogError(LogCategory.Error, msg, args);
        }

        internal void LogWarning(string msg, params object[] args)
        {
            LogError(LogCategory.Warning, msg, args);
        }

        private void LogError(LogCategory category, string msg, params object[] args)
        {
            AddinManager.Log(new Error(category, msg, args) { Origin = FileLocation.GetValueOrDefault() });
        }

        #endregion

        #endregion
    }
}