using NewLife.Log;
using NewLife.Reflection;

namespace NewLife.Web;

/// <summary>插件助手</summary>
public static class PluginHelper
{
    /// <summary>加载插件</summary>
    /// <param name="typeName"></param>
    /// <param name="disname"></param>
    /// <param name="dll"></param>
    /// <param name="linkName"></param>
    /// <param name="urls">提供下载地址的多个目标页面</param>
    /// <returns></returns>
    public static Type? LoadPlugin(String typeName, String? disname, String dll, String linkName, String? urls = null)
    {
        if (typeName.IsNullOrEmpty()) throw new ArgumentNullException(nameof(typeName));

        //var type = typeName.GetTypeEx(true);
        var type = Type.GetType(typeName);
        if (type != null) return type;

        if (dll.IsNullOrEmpty()) return null;

        lock (typeName)
        {
            var set = Setting.Current;

            var file = "";
            if (!dll.IsNullOrEmpty())
            {
                // 先检查当前目录，再检查插件目录
                file = dll.GetCurrentPath();
                if (!File.Exists(file)) file = dll.GetFullPath();
                if (!File.Exists(file)) file = dll.GetBasePath();
                if (!File.Exists(file)) file = set.PluginPath.CombinePath(dll).GetFullPath();
                if (!File.Exists(file)) file = set.PluginPath.CombinePath(dll).GetBasePath();
            }

            if (linkName.IsNullOrEmpty()) return null;

            // 按类型名锁定，超时取不到锁，则放弃
            if (!Monitor.TryEnter(typeName, 15_000)) return null;

            //lock (typeName)
            {
                type = Type.GetType(typeName);
                if (type != null) return type;

                if (urls.IsNullOrEmpty()) urls = set.PluginServer;

                // 如果本地没有数据库，则从网络下载
                if (!File.Exists(file))
                {
                    XTrace.WriteLine("{0}不存在或平台版本不正确，准备联网获取 {1}", !disname.IsNullOrEmpty() ? disname : dll, urls);

                    var client = new WebClientX()
                    {
                        Log = XTrace.Log
                    };
                    var dir = Path.GetDirectoryName(file);
                    var file2 = client.DownloadLinkAndExtract(urls, linkName, dir);
                    client.TryDispose();
                }
                if (!File.Exists(file))
                {
                    XTrace.WriteLine("未找到 {0} {1}", disname, dll);
                    return null;
                }

                //return Assembly.LoadFrom(file).GetType(typeName);
                return typeName.GetTypeEx(true);
            }
        }
    }
}