module Jasmine
  class CommandLineTool
    def cwd
      File.expand_path(File.join(File.dirname(__FILE__), '../..'))
    end

    def expand(*paths)
      File.expand_path(File.join(*paths))
    end

    def template_path(filepath)
      expand(cwd, File.join("generators", "jasmine" ,"templates", filepath))
    end

    def dest_path(filepath)
      expand(Dir.pwd, filepath)
    end

    def copy_unless_exists(relative_path, dest_path = nil)
      unless File.exist?(dest_path(relative_path))
        FileUtils.copy(template_path(relative_path), dest_path(dest_path || relative_path))
      end
    end

    def process(argv)
      if argv[0] == 'init'
        require 'fileutils'

        FileUtils.makedirs('public/javascripts')
        FileUtils.makedirs('spec/javascripts')
        FileUtils.makedirs('spec/javascripts/support')
        FileUtils.makedirs('spec/javascripts/helpers')

        copy_unless_exists('jasmine-example/src/Player.js', 'public/javascripts/Player.js')
        copy_unless_exists('jasmine-example/src/Song.js', 'public/javascripts/Song.js')
        copy_unless_exists('jasmine-example/spec/PlayerSpec.js', 'spec/javascripts/PlayerSpec.js')
        copy_unless_exists('jasmine-example/spec/SpecHelper.js', 'spec/javascripts/helpers/SpecHelper.js')

        rails_tasks_dir = dest_path('lib/tasks')
        if File.exist?(rails_tasks_dir)
          copy_unless_exists('lib/tasks/jasmine.rake')
          copy_unless_exists('spec/javascripts/support/jasmine-rails.yml', 'spec/javascripts/support/jasmine.yml')
        else
          copy_unless_exists('spec/javascripts/support/jasmine.yml')
          require 'rake'
          write_mode = 'w'
          if File.exist?(dest_path('Rakefile'))
            load dest_path('Rakefile')
            write_mode = 'a'
          end

          unless Rake::Task.task_defined?('jasmine')
            File.open(dest_path('Rakefile'), write_mode) do |f|
              f.write("\n" + File.read(template_path('lib/tasks/jasmine.rake')))
            end
          end
        end
        File.open(template_path('INSTALL'), 'r').each_line do |line|
          puts line
        end
      elsif argv[0] == "license"
        puts File.new(expand(cwd, "MIT.LICENSE")).read
      else
        puts "unknown command #{argv}"
        puts "Usage: jasmine init"
        puts "               license"
      end
    end
  end
end