// Copyright (c) 2024 Celestino Amoroso (celestino.amoroso@gmail.com).
// All rights reserved.

// gzip-util.go
package utils

import (
	"bufio"
	"compress/gzip"
	"fmt"
	"io"
	"strings"
)

const GZIP_SUFFIX = ".gz"

func CreateGzipReader(in io.Reader) (reader *bufio.Reader, err error) {
	var inflate *gzip.Reader
	if inflate, err = gzip.NewReader(in); err != nil {
		err = fmt.Errorf("can't inflate gzipped input stream: %v", err)
	} else {
		reader = bufio.NewReader(inflate)
	}
	return
}

func CreateGzipFile(in io.Reader, fileName string) (reader *bufio.Reader, err error) {
	var inflate *gzip.Reader
	if len(fileName) > 0 && strings.HasSuffix(fileName, GZIP_SUFFIX) {
		if inflate, err = gzip.NewReader(in); err != nil {
			err = fmt.Errorf("can't inflate gzipped input stream %#v: %v", fileName, err)
		} else {
			reader = bufio.NewReader(inflate)
		}
	} else {
		reader = bufio.NewReader(in)
	}
	return
}