package utils

import (
    // "fmt"
    "os"
    "io"
    "path"
    "net/http"
    "archive/tar"
    "compress/gzip"
)

func DownloadFromUrl(dest string, url string, chmod os.FileMode) error {

    resp, err := http.Get(url)
    if err != nil {
        return err
    }
    defer resp.Body.Close()

    out, err := os.Create(dest)
    defer out.Close()
    if err != nil {
        return err
    }

    _, err = io.Copy(out, resp.Body)
    if err != nil {
        return err
    }

    os.Chmod(dest, chmod)

    return nil
}


func ExtractTarGz(dest string, gzipStream io.Reader) error {
    uncompressedStream, err := gzip.NewReader(gzipStream)
    if err != nil {
        return err
    }

    tarReader := tar.NewReader(uncompressedStream)

    for true {
        header, err := tarReader.Next()

        if err == io.EOF {
            break
        }

        switch header.Typeflag {
        case tar.TypeDir:
            // if err := os.Mkdir(dest + "/" + header.Name, 0755); err != nil {
            // 	return err
            // }
        case tar.TypeReg:
            outName := dest + "/" + path.Base( header.Name)
            outFile, _ := os.Create(outName)
            if err != nil {
                return err
            }
            if _, err := io.Copy(outFile, tarReader); err != nil {
                return err
            }
            outFile.Close()
        }

    }
    return nil
}