#!/usr/bin/env python3

import argparse
import os
import shutil
import subprocess
import sys
import tarfile
import tempfile
import urllib.request

BASE_URL = "https://github.com/nodejs/gyp-next/archive/"
CHECKOUT_PATH = os.path.dirname(os.path.realpath(__file__))
CHECKOUT_GYP_PATH = os.path.join(CHECKOUT_PATH, 'gyp')

parser = argparse.ArgumentParser()
parser.add_argument("tag", help="gyp tag to update to")
args = parser.parse_args()

tar_url = BASE_URL + args.tag + ".tar.gz"

changed_files = subprocess.check_output(["git", "diff", "--name-only"]).strip()
if changed_files:
  raise Exception("Can't update gyp while you have uncommitted changes in node-gyp")

with tempfile.TemporaryDirectory() as tmp_dir:
  tar_file = os.path.join(tmp_dir, 'gyp.tar.gz')
  unzip_target = os.path.join(tmp_dir, 'gyp')
  with open(tar_file, 'wb') as f:
    print("Downloading gyp-next@" + args.tag + " into temporary directory...")
    print("From: " + tar_url)
    with urllib.request.urlopen(tar_url) as in_file:
        f.write(in_file.read())

    print("Unzipping...")
    with tarfile.open(tar_file, "r:gz") as tar_ref:
      tar_ref.extractall(unzip_target)

    print("Moving to current checkout (" + CHECKOUT_PATH + ")...")
    if os.path.exists(CHECKOUT_GYP_PATH):
      shutil.rmtree(CHECKOUT_GYP_PATH)
    shutil.move(os.path.join(unzip_target, os.listdir(unzip_target)[0]), CHECKOUT_GYP_PATH)

subprocess.check_output(["git", "add", "gyp"], cwd=CHECKOUT_PATH)
subprocess.check_output(["git", "commit", "-m", "gyp: update gyp to " + args.tag])
