// Copyright 2026 MarketAlly. All rights reserved.
// SPDX-License-Identifier: MIT

package plugins

import (
	"errors"
	"fmt"
	"os"
	"path/filepath"
	"plugin"

	"code.gitcaddy.com/server/v3/modules/log"
	"code.gitcaddy.com/server/v3/modules/setting"
)

// LoadAll loads all plugins from the configured plugin directory
func LoadAll() error {
	if !setting.Plugins.Enabled {
		log.Info("Plugin system is disabled")
		return nil
	}

	pluginDir := setting.Plugins.Path
	if pluginDir == "" {
		pluginDir = filepath.Join(setting.AppDataPath, "plugins")
	}

	// Check if plugin directory exists
	info, err := os.Stat(pluginDir)
	if os.IsNotExist(err) {
		log.Info("Plugin directory does not exist: %s", pluginDir)
		return nil
	}
	if err != nil {
		return fmt.Errorf("failed to stat plugin directory: %w", err)
	}
	if !info.IsDir() {
		return fmt.Errorf("plugin path is not a directory: %s", pluginDir)
	}

	log.Info("Loading plugins from: %s", pluginDir)

	// Find all .so files in the plugin directory
	entries, err := os.ReadDir(pluginDir)
	if err != nil {
		return fmt.Errorf("failed to read plugin directory: %w", err)
	}

	loadedCount := 0
	for _, entry := range entries {
		if entry.IsDir() {
			continue
		}

		name := entry.Name()
		if filepath.Ext(name) != ".so" {
			continue
		}

		pluginPath := filepath.Join(pluginDir, name)
		if err := loadPlugin(pluginPath); err != nil {
			log.Error("Failed to load plugin %s: %v", name, err)
			// Continue loading other plugins
			continue
		}
		loadedCount++
	}

	log.Info("Loaded %d plugin(s)", loadedCount)
	return nil
}

// loadPlugin loads a single plugin from a .so file
func loadPlugin(path string) error {
	log.Info("Loading plugin: %s", path)

	// Open the plugin
	p, err := plugin.Open(path)
	if err != nil {
		return fmt.Errorf("failed to open plugin: %w", err)
	}

	// Look for the Plugin symbol
	sym, err := p.Lookup("Plugin")
	if err != nil {
		return fmt.Errorf("plugin does not export 'Plugin' symbol: %w", err)
	}

	// The Plugin symbol should be a pointer to a Plugin interface implementation
	plug, ok := sym.(*Plugin)
	if !ok {
		// Try to see if it's the interface directly
		plugDirect, ok := sym.(Plugin)
		if !ok {
			return fmt.Errorf("Plugin symbol is not a plugins.Plugin (got %T)", sym)
		}
		Register(plugDirect)
		return nil
	}

	if plug == nil || *plug == nil {
		return errors.New("plugin symbol is nil")
	}

	Register(*plug)
	return nil
}