using Apimanager_backend.Data;
using Public;
using System.Reflection;

namespace Apimanager_backend.Services
{
    // PluginLoaderService.cs
    public class PluginLoaderService
    {
        private readonly IWebHostEnvironment _env;
        private readonly ILogger<PluginLoaderService> _logger;

        public PluginLoaderService(
            IWebHostEnvironment env,
            ILogger<PluginLoaderService> logger)
        {
            _env = env;
            _logger = logger;
        }

        public void LoadPlugins(IServiceCollection services)
        {
            var pluginsDir = Path.Combine(_env.ContentRootPath, "ApiHandler");
            Directory.CreateDirectory(pluginsDir);

            foreach (var dllPath in Directory.GetFiles(pluginsDir, "*.dll"))
            {
                try
                {
                    var assembly = LoadPluginAssembly(dllPath);
                    RegisterPluginServices(assembly, services);
                    _logger.LogInformation($"已加载插件: {Path.GetFileName(dllPath)}");
                }
                catch (Exception ex)
                {
                    _logger.LogError(ex, $"加载插件失败: {dllPath}");
                }
            }
        }

        private Assembly LoadPluginAssembly(string dllPath)
        {
            // 使用隔离的加载上下文
            var loadContext = new PluginLoadContext(dllPath);
            return loadContext.LoadFromAssemblyPath(dllPath);
        }

        private void RegisterPluginServices(Assembly assembly, IServiceCollection services)
        {
            foreach (var type in assembly.GetTypes())
            {
                if (typeof(IBillableApiHandler).IsAssignableFrom(type) &&
                    !type.IsInterface &&
                    !type.IsAbstract)
                {
                    services.AddTransient(typeof(IBillableApiHandler), type);
                    services.AddTransient(type); // 同时注册具体类型
                }
            }
        }
    }
}