package main

import (
	"flag"
	"fmt"
	"os"
	"path/filepath"
	"regexp"
)

func main() {
	flag.Parse()
	if flag.NArg() == 0 {
		fmt.Println("Usage: cleaner <files>")
		os.Exit(1)
	}
	// regex to match " - 2025-07-08 01h31m45s - "
	re := regexp.MustCompile(` - (\d{4}-\d{2}-\d{2} \d{2}h\d{2}m\d{2}s) - `)

	for _, file := range flag.Args() {
		info, err := os.Stat(file)
		if err != nil {
			fmt.Printf("ERROR: %v\n", err)
			continue
		}
		if info.IsDir() {
			fmt.Printf("SKIP (directory): %s\n", file)
			continue
		}
		name := filepath.Base(file)
		match := re.FindStringSubmatch(name)
		if match == nil {
			fmt.Printf("SKIP (no date pattern): %s\n", name)
			continue
		}

		newName := match[1] + filepath.Ext(name)
		if name == newName {
			fmt.Printf("SKIP (already named): %s\n", name)
			continue
		}

		if _, err := os.Stat(newName); err == nil {
			fmt.Printf("SKIP (target exists): %s -> %s\n", name, newName)
			continue
		}

		err = os.Rename(name, newName)
		if err != nil {
			fmt.Printf("ERROR renaming %s: %v\n", name, err)
		} else {
			fmt.Printf("RENAMED: %s -> %s\n", name, newName)
		}
		continue
	}
}