module Jets::Git
  class Github
    def params
      params = {
        git_system: 'github',
        git_branch: git_branch,
        git_sha: git_sha,
        git_dirty: false,
        # git_message: nil,
        # git_version: nil,
      }
      params[:git_url] = git_url if git_url
      params
    end

    def git_branch
      if build_type == "pull_request"
        pr.dig('pull_request','head','ref')
      else # push
        ENV['GITHUB_REF_NAME']
      end
    end

    def git_sha
      if build_type == "pull_request"
        pr.dig('pull_request','head','sha')
      else # push
        ENV['GITHUB_SHA']
      end
    end

    def git_url
      host = ENV['GITHUB_SERVER_URL'] || 'https://github.com'
      full_repo = ENV['GITHUB_REPOSITORY']
      "#{host}/#{full_repo}"
    end

    # GitHub webhook JSON payload in file and path is set in GITHUB_EVENT_PATH
    def pr
      return {} unless ENV['GITHUB_EVENT_PATH']
      JSON.load(IO.read(ENV['GITHUB_EVENT_PATH']))
    end

    def build_type
      ENV['GITHUB_EVENT_NAME']
    end
  end
end