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#!/usr/bin/env ruby

# frozen_string_literal: false

require 'active_support/core_ext/object/to_query'
require 'optparse'
require 'open3'
require 'rainbow/refinement'
using Rainbow

module Secpick
  BRANCH_PREFIX = 'security'.freeze
  STABLE_SUFFIX = 'stable'.freeze

  DEFAULT_REMOTE = 'dev'.freeze
  SECURITY_REMOTE = 'security'.freeze

  NEW_MR_URL = 'https://dev.gitlab.org/gitlab/gitlabhq/-/merge_requests/new'.freeze
  SECURITY_MR_URL = 'https://gitlab.com/gitlab-org/security/gitlab/-/merge_requests/new'.freeze

  class SecurityFix
    def initialize
      @options = self.class.options
    end

    def ee?
      File.exist?(File.expand_path('../ee/app/models/license.rb', __dir__))
    end

    def dry_run?
      @options[:try] == true
    end

    def original_branch
      @options[:branch].strip
    end

    def source_branch
      branch = "#{original_branch}-#{@options[:version]}"
      branch.prepend("#{BRANCH_PREFIX}-") unless branch.start_with?("#{BRANCH_PREFIX}-")
      branch.freeze
    end

    def stable_branch
      "#{@options[:version]}-#{STABLE_SUFFIX}".tap do |name|
        name << "-ee" if ee?
      end.freeze
    end

    def git_commands
      ["git fetch #{@options[:remote]} #{stable_branch}",
       "git checkout -B #{source_branch} #{@options[:remote]}/#{stable_branch} --no-track",
       "git cherry-pick #{@options[:sha]}",
       "git push #{@options[:remote]} #{source_branch}",
       "git checkout #{original_branch}"]
    end

    def gitlab_params
      {
        issuable_template: 'Security Release',
        merge_request: {
          source_branch: source_branch,
          target_branch: stable_branch
        }
      }
    end

    def new_mr_url
      if @options[:security_remote]
        if ee?
          SECURITY_MR_URL
        else
          SECURITY_MR_URL.sub('/gitlab/', '/gitlab-foss/')
        end
      else
        if ee?
          NEW_MR_URL.sub('gitlabhq', 'gitlab-ee')
        else
          NEW_MR_URL
        end
      end
    end

    def create!
      if dry_run?
        puts "\nGit commands:".blue
        puts git_commands.join("\n")

        puts "\nMerge request URL:".blue
        puts new_mr_url

        puts "\nMerge request params:".blue
        pp gitlab_params
      else
        cmd = git_commands.join(' && ')
        stdin, stdout, stderr, wait_thr = Open3.popen3(cmd)

        puts stdout.read&.green
        puts stderr.read&.red

        if wait_thr.value.success?
          puts "#{new_mr_url}?#{gitlab_params.to_query}".blue
        end

        stdin.close
        stdout.close
        stderr.close
      end
    end

    def self.options
      { version: nil, branch: nil, sha: nil }.tap do |options|
        parser = OptionParser.new do |opts|
          opts.banner = "Usage: #{$0} [options]"
          opts.on('-v', '--version 10.0', 'Version') do |version|
            options[:version] = version&.tr('.', '-')
          end

          opts.on('-b', '--branch security-fix-branch', 'Original branch name (optional, defaults to current)') do |branch|
            options[:branch] = branch
          end

          opts.on('-s', '--sha abcd', 'SHA or SHA range to cherry pick') do |sha|
            options[:sha] = sha
          end

          opts.on('-r', '--remote abcd', 'Git remote name of dev.gitlab.org (optional, defaults to `dev`)') do |remote|
            options[:remote] = remote
          end

          opts.on('--security-remote', 'Use the new Security group-based workflow on gitlab.com (note: mutually exclusive to --remote)') do
            unless options[:remote].nil?
              abort('Cannot use --security-remote with --remote')
            end

            options[:security_remote] = true
            options[:remote] = SECURITY_REMOTE
          end

          opts.on('-d', '--dry-run', 'Only show Git commands, without calling them') do
            options[:try] = true
          end

          opts.on('-h', '--help', 'Displays Help') do
            puts opts

            puts
            puts 'NOTE: If `--security-remote` is used, commands will default ' \
              'to using a `security` remote, and merge requests will be created ' \
              'on gitlab.com/gitlab-org/security/ rather than dev.gitlab.org.'

            exit
          end
        end

        parser.parse!

        options[:branch] ||= `git rev-parse --abbrev-ref HEAD`
        options[:remote] ||= DEFAULT_REMOTE

        abort("Missing options. Use #{$0} --help to see the list of options available".red) if options.value?(nil)
        abort("Wrong version format #{options[:version].bold}".red) unless options[:version] =~ /\A\d*\-\d*\Z/
      end
    end
  end
end

Secpick::SecurityFix.new.create!