// Author: Orlys
// Github: https://github.com/Orlys

namespace Yuuna.Contracts.Modules
{
    using System;
    using System.Reflection;

    [AttributeUsage(AttributeTargets.Class)]
    public sealed class ModuleMetadataAttribute : Attribute, IModuleMetadata
    {
        public ModuleMetadataAttribute(string name)
        {
            this.Name = name;
        }

        public string Name { get; private set; }
        public string Author { get; set; }
        public string Url { get; set; }
        public string Description { get; set; }

        internal static IModuleMetadata GetMetadata(Type type)
        {
            var meta = type.GetCustomAttribute<ModuleMetadataAttribute>();
            if (meta is null)
                meta = new ModuleMetadataAttribute(type.Name);
            else if (string.IsNullOrWhiteSpace(meta.Name))
                meta.Name = type.Name;
            return meta;
        }
    }

    //public abstract class ModuleBase 
    //{
    //    private readonly PatternFactory _patternfactory;

    //    /// <summary>
    //    /// 中繼資料。
    //    /// </summary> 
    //    public ModuleMetadataAttribute Metadata { get; }

    //    internal IPatternSet Patterns => this._patternfactory;

    //    public ModuleBase()
    //    {
    //        this.Status = ModuleStatus.Uninitialized;
    //        this._patternfactory = new PatternFactory(this);
    //        this.Metadata = ModuleMetadataAttribute.GetMetadata(this.GetType());
    //    }


    //    /// <summary>
    //    /// 表示模組是否已初始化。
    //    /// </summary>
    //    public ModuleStatus Status { get; private set; }

    //    /// <summary>
    //    /// 初始化模組
    //    /// </summary>
    //    /// <param name="textSegmenter">分詞器</param>
    //    /// <param name="groupManager">群組管理</param>
    //    internal void Initialize(ITextSegmenter textSegmenter, IGroupManager groupManager)
    //    {
    //        if (this.Status.Equals(ModuleStatus.Uninitialized))
    //        {
    //            try
    //            {
    //                this.BuildPatterns(groupManager, this._patternfactory);
    //                textSegmenter.Load(groupManager);
    //                this.Status = ModuleStatus.Initialized;
    //                this.AfterInitialize();
    //            }
    //            catch //(Exception e)
    //            {
    //                this.Status = ModuleStatus.FailToInitialize;
    //            }
    //        }
    //    }


    //    /// <summary>
    //    /// 在初始化後引發。
    //    /// </summary>
    //    protected virtual void AfterInitialize()
    //    {
    //    }

    //    /// <summary>
    //    /// 建立模式規則。
    //    /// </summary>
    //    /// <param name="g"></param>
    //    /// <param name="p"></param>
    //    protected abstract void BuildPatterns(IGroupManager g, IPatternBuilder p);


    //}
}