require 'json'
require 'pathname'
require 'typescript-src/version'

module TypeScript
  module Src
    class << self
      attr_accessor :use_external_tsc

      # @return [Pathname]
      def typescript_path
        unless @typescript_path
          if self.use_external_tsc
            @typescript_path = ::Pathname.new(`npm root -g`.strip! + '/typescript')
          else
            @typescript_path = ::Pathname.new(File.dirname(__FILE__)).join('typescript-src/support/typescript')
          end
        end

        @typescript_path
      end

      # @return [Pathname]
      def tsc_path
        typescript_path.join('bin/tsc')
      end

      # @return [Pathname]
      def js_path
        typescript_path.join('bin/tsc.js')
      end

      # @return [Pathname]
      def package_json_path
        typescript_path.join('package.json')
      end

      # @return [Pathname]
      def license_path
        typescript_path.join('LICENSE.txt')
      end

      ### contents

      # @return [String]
      def js_content
        js_path.read
      end

      # @return [Hash]
      def package_info
        JSON.parse(package_json_path.read)
      end

      # @return [String]
      def version
        package_info['version']
      end
    end

    self.use_external_tsc = false
  end
end