package main

import (
	"archive/tar"
	"fmt"
	"io"
	"log"
	"net/http"
	"os"
	"path/filepath"

	"github.com/therootcompany/xz"
)

func downloadHeadless() {
	headlessQuery := fmt.Sprintf("https://www.factorio.com/get-download/latest/headless/linux64")

	url := headlessQuery
	resp, err := http.Get(url)
	if err != nil || resp.StatusCode != http.StatusOK {
		log.Fatal("Download failed")
	}
	defer resp.Body.Close()

	// Wrap stream in XZ and Tar readers
	xzReader, _ := xz.NewReader(resp.Body, 0)
	tr := tar.NewReader(xzReader)

	for {
		header, err := tr.Next()
		if err == io.EOF {
			break
		}

		target := filepath.Join(".", header.Name)
		switch header.Typeflag {
		case tar.TypeDir:
			os.MkdirAll(target, 0755)
		case tar.TypeReg:
			os.MkdirAll(filepath.Dir(target), 0755)
			outFile, _ := os.Create(target)
			io.Copy(outFile, tr)
			outFile.Close()
		}
	}
}