# encoding: utf-8

require 'shellwords'

module Inspec::Resources
  class NpmPackage < Inspec.resource(1)
    name 'npm'
    supports platform: 'unix'
    supports platform: 'windows'
    desc 'Use the npm InSpec audit resource to test if a global npm package is installed. npm is the the package manager for Nodejs packages, such as bower and StatsD.'
    example "
      describe npm('bower') do
        it { should be_installed }
      end

      describe npm('tar', path: '/path/to/project') do
        it { should be_installed }
      end
    "

    def initialize(package_name, opts = {})
      @package_name = package_name
      @location = opts[:path]
      @cache = nil
    end

    def info
      return @info if defined?(@info)

      if @location
        npm = "cd #{Shellwords.escape @location} && npm"
      else
        npm = 'npm -g'
      end

      cmd = inspec.command("#{npm} ls --json #{@package_name}")
      @info = {
        name: @package_name,
        type: 'npm',
        installed: cmd.exit_status == 0,
      }
      return @info unless @info[:installed]

      pkgs = JSON.parse(cmd.stdout)
      @info[:version] = pkgs['dependencies'][@package_name]['version']
      @info
    end

    def installed?
      info[:installed] == true
    end

    def version
      info[:version]
    end

    def to_s
      "Npm Package #{@package_name}"
    end
  end
end