package util

import (
	"github.com/fsnotify/fsnotify"
	"go.uber.org/zap"
)

func DirWatch(monitorDir string, addChan chan string) {
	logger := zap.L()

	watcher, err := fsnotify.NewWatcher()
	if err != nil {
		logger.Error("create dir watcher failed:", zap.Error(err))
	}
	defer watcher.Close()

	err = watcher.Add(monitorDir)
	if err != nil {
		logger.Error("add monitor dir failed:", zap.Error(err))
	}

	for {
		select {
		case event, ok := <-watcher.Events:
			if !ok {
				return
			}

			if event.Op&fsnotify.Create == fsnotify.Create {
				logger.Info("file add in watcher dir", zap.String("file_name", event.Name))
				addChan <- event.Name
			}

			if event.Op&fsnotify.Remove == fsnotify.Remove {
				logger.Info("file remove in watcher dir", zap.String("file_name", event.Name))
			}
		case err, ok := <-watcher.Errors:
			if !ok {
				logger.Error("monitor watcher error channel closed", zap.Bool("channel_status", ok))
				return
			}

			logger.Error("monitor watcher error occurred", zap.Error(err))
		}
	}
}