using System.Reflection;
using Inspectron.Settings;
using Ninject;
using Serilog;
using VisionBuilder.UI.Common.Attributes;

namespace VisionBuilder.UI.Common.Plugins;

[ModulePriority(1000)]
public class PluginLoader:IVisionBuilderModule
{
    private readonly PluginSettings _settings;


    const string PLUGINS_DIRECTORY = "Plugins";
    public PluginLoader(PluginSettings settings)
    {
        _settings = settings;
    }

    public List<IPlugin> Plugins { get; } = new List<IPlugin>();

    private bool _isInitialized;
    public void InitializeModule()
    {
        if (_isInitialized)
        {
            return;
        }

        _isInitialized = true;
        Log.Information("Loading plugins...");
        var pluginsPath = Path.Combine("..", "Data", PLUGINS_DIRECTORY);
        Directory.CreateDirectory(pluginsPath);
        var pluginFolders = Directory.GetDirectories(pluginsPath);
        
        foreach (string folder in pluginFolders)
        {
            var pluginName = Path.GetFileNameWithoutExtension(folder);

            if (_settings.Plugins.All(p => p.Name != pluginName))
            {
                Log.Warning("Discovered new plugin:{PluginName}. Adding to settings and skipping.", pluginName);
                _settings.Plugins.Add(new PluginSettings.PluginFlag { Name = pluginName, Enabled = false });
                continue;
            }

            if (_settings.Plugins.Where(p => p.Name == pluginName).All(x=>!x.Enabled))
            {
                Log.Information("Skipping plugin {PluginName} as it is not enabled in settings.", pluginName);
                continue;
            }
            

            var assemblyPath = Path.Combine(folder, Path.GetFileNameWithoutExtension(folder) + ".dll");

            if (!File.Exists(assemblyPath))
            {
                Log.Warning("Plugin assembly not found: {AssemblyPath}", assemblyPath);
                continue;
            }
            try
            {
                LoadPluginAssembly(assemblyPath);
            }
            catch (Exception ex)
            {
                Log.Error(ex, "Failed to load plugin from {AssemblyPath}", assemblyPath);
            }
        }
        Log.Information("Plugin loading completed.");
    }

    private void LoadPluginAssembly(string assemblyPath)
    {
        var absPath = Path.GetFullPath(assemblyPath);
        var loadContext = new PluginLoadContext(absPath);
        var assembly = loadContext.LoadFromAssemblyPath(absPath);
        Log.Information("Loaded plugin assembly: {AssemblyName}", assembly.GetName().Name);
        foreach (var type in assembly.GetTypes())
        {
            if (type.IsAssignableTo(typeof(IPlugin)) && !type.IsAbstract)
            {
                Plugins.Add((IPlugin)Activator.CreateInstance(type));
                Log.Information("Loaded plugin: {PluginName}", type.Name);
            }


        }
    }

    
}