package fileutil

import (
	"crypto/sha256"
	"encoding/hex"
	"fmt"
	"io"
	"os"
)

func EnsureDir(path string) error {
	info, err := os.Stat(path)
	if os.IsNotExist(err) {
		return os.MkdirAll(path, 0755)
	}
	if err != nil {
		return err
	}
	if !info.IsDir() {
		return fmt.Errorf("file already exists at %s", path)
	}
	return nil
}

func FileExists(path string) bool {
	info, err := os.Stat(path)
	return err == nil && !info.IsDir()
}

func DeleteFile(path string) error {
	if !FileExists(path) {
		return nil
	}
	return os.Remove(path)
}

func GetFileHash(path string) (string, error) {
	file, err := os.Open(path)
	if err != nil {
		return "", err
	}
	defer file.Close()

	h := sha256.New()
	if _, err := io.Copy(h, file); err != nil {
		return "", err
	}

	return hex.EncodeToString(h.Sum(nil)), nil
}