// Copyright (c) 2023 Open Anolis Community Distro SIG, all rights reserved.
//
// Author: Jacob Wang <jacob.wang@openanolis.org>
//         Xiao Lun <xiaolun@linux.alibaba.com>
//         Zhao Hang <zhaohang_mskdxl@qq.com>

package file

import (
	"fmt"
	"io/ioutil"
	"os"
	"path/filepath"
)

type File struct {
	path string
}

func New(path string) *File {
	return &File{
		path: path,
	}
}

func (f *File) Write(path string, content []byte) error {
	w, err := os.OpenFile(filepath.Join(f.path, path), os.O_CREATE|os.O_TRUNC|os.O_RDWR, 0o644)
	if err != nil {
		return fmt.Errorf("could not open file: %v", err)
	}

	_, err = w.Write(content)
	if err != nil {
		return fmt.Errorf("could not write file to file: %v", err)
	}

	// Close, just like writing a file.
	if err := w.Close(); err != nil {
		return fmt.Errorf("could not close file writer to source: %v", err)
	}

	return nil
}

func (f *File) Read(path string) ([]byte, error) {
	r, err := os.OpenFile(filepath.Join(f.path, path), os.O_RDONLY, 0o644)
	if err != nil {
		if os.IsNotExist(err) {
			return nil, nil
		}
		return nil, err
	}

	body, err := ioutil.ReadAll(r)
	if err != nil {
		return nil, err
	}

	return body, nil
}

func (f *File) Exists(path string) (bool, error) {
	_, err := os.Stat(filepath.Join(f.path, path))
	if !os.IsNotExist(err) {
		if !os.IsExist(err) {
			return false, err
		}
		return true, nil
	}

	return false, nil
}