// Copyright 2018 Google Inc. Use of this source code is governed by an
// MIT-style license that can be found in the LICENSE file or at
// https://opensource.org/licenses/MIT.

import 'dart:io';

import 'package:crypto/crypto.dart';
import 'package:dart2_constant/convert.dart' as convert;
import 'package:grinder/grinder.dart';

import 'utils.dart';

/// A regular expression for locating the URL and SHA256 hash of the Sass
/// archive in the `homebrew-sass` formula.
final _homebrewRegExp = new RegExp(r'\n( *)url "[^"]+"'
    r'\n *sha256 "[^"]+"');

@Task('Update the Homebrew formula for the current version.')
update_homebrew() async {
  ensureBuild();

  var process = await Process.start("git",
      ["archive", "--prefix=dart-sass-$version/", "--format=tar.gz", version]);
  var digest = await sha256.bind(process.stdout).first;
  var stderr = await convert.utf8.decodeStream(process.stderr);
  if ((await process.exitCode) != 0) {
    fail('git archive "$version" failed:\n$stderr');
  }

  if (new Directory("build/homebrew-sass/.git").existsSync()) {
    await runAsync("git",
        arguments: ["fetch", "origin"],
        workingDirectory: "build/homebrew-sass");
    await runAsync("git",
        arguments: ["reset", "--hard", "origin/master"],
        workingDirectory: "build/homebrew-sass");
  } else {
    delete(new Directory("build/homebrew-sass"));
    await runAsync("git", arguments: [
      "clone",
      "https://github.com/sass/homebrew-sass.git",
      "build/homebrew-sass"
    ]);
  }

  var formula = new File("build/homebrew-sass/sass.rb");
  log("updating ${formula.path}");
  formula.writeAsStringSync(formula.readAsStringSync().replaceFirstMapped(
      _homebrewRegExp,
      (match) =>
          '\n${match[1]}url "https://github.com/sass/dart-sass/archive/$version.tar.gz"'
          '\n${match[1]}sha256 "$digest"'));

  run("git",
      arguments: [
        "commit",
        "--all",
        "--message",
        "Update Dart Sass to $version"
      ],
      workingDirectory: "build/homebrew-sass");

  var username = environment('GITHUB_USER');
  var password = environment('GITHUB_AUTH');
  await runAsync("git",
      arguments: [
        "push",
        "https://$username:$password@github.com/sass/homebrew-sass.git"
      ],
      workingDirectory: "build/homebrew-sass");
}