package watchers

import (
	"fmt"
	"strings"
	"sync"

	"Moonshark/router"
	"Moonshark/runner"
	"Moonshark/utils/color"
	"Moonshark/utils/logger"
)

// Global watcher manager instance with explicit creation
var (
	globalManager     *WatcherManager
	globalManagerOnce sync.Once
)

// GetWatcherManager returns the global watcher manager, creating it if needed
func GetWatcherManager() *WatcherManager {
	globalManagerOnce.Do(func() {
		globalManager = NewWatcherManager(DefaultPollInterval)
	})
	return globalManager
}

// ShutdownWatcherManager closes the global watcher manager if it exists
func ShutdownWatcherManager() {
	if globalManager != nil {
		globalManager.Close()
		globalManager = nil
	}
}

// WatchLuaRouter sets up a watcher for a LuaRouter's routes directory
func WatchLuaRouter(router *router.LuaRouter, runner *runner.Runner, routesDir string) (*DirectoryWatcher, error) {
	manager := GetWatcherManager()

	config := DirectoryWatcherConfig{
		Dir:       routesDir,
		Callback:  router.Refresh,
		Recursive: true,
	}

	watcher, err := manager.WatchDirectory(config)
	if err != nil {
		return nil, fmt.Errorf("failed to watch directory: %w", err)
	}

	logger.Info("Started watching Lua routes! %s", color.Yellow(routesDir))
	return watcher, nil
}

// WatchLuaModules sets up watchers for Lua module directories
func WatchLuaModules(luaRunner *runner.Runner, libDirs []string) ([]*DirectoryWatcher, error) {
	manager := GetWatcherManager()
	watchers := make([]*DirectoryWatcher, 0, len(libDirs))

	for _, dir := range libDirs {
		config := DirectoryWatcherConfig{
			Dir: dir,
			EnhancedCallback: func(changes []FileChange) error {
				for _, change := range changes {
					if !change.IsDeleted && strings.HasSuffix(change.Path, ".lua") {
						luaRunner.NotifyFileChanged(change.Path)
					}
				}
				return nil
			},
			Recursive: true,
		}

		watcher, err := manager.WatchDirectory(config)
		if err != nil {
			// Error handling...
		}

		watchers = append(watchers, watcher)
		logger.Info("Started watching Lua modules! %s", color.Yellow(dir))
	}

	return watchers, nil
}