require 'barber'
require 'coffee-script'
require 'fileutils'
require 'sass'

module Pyro
  class Asset
    attr_accessor :file, :build_dir, :working_dir, :helper_args

    def initialize(args)
      args.each { |k, v| instance_variable_set("@#{k}", v) }
    end

    def mtime
      File.mtime file
    end

    def basename
      File.basename file
    end

    def dirname
      File.dirname file
    end

    def extname
      File.extname file
    end

    def name
      basename.sub(extname, '')
    end

    def timestamp
      mtime.strftime "%Y%m%d%H%M%S"
    end

    def relative_dir
      dirname.sub("#{working_dir}/", '')
    end

    def relative_file
      if helper_args[:target]
        helper_args[:target]
      else
        "#{relative_dir}/#{name}#{compiled_ext}"
      end
    end

    def compiled_ext
      case extname
      when '.coffee', '.hbs', '.handlebars'
        '.js'
      when '.scss'
        '.css'
      else
        extname
      end
    end

    def contents
      contents = File.read file
      case extname
      when '.coffee'
        contents = CoffeeScript.compile(contents, bare: true)
      when '.scss'
        contents = Sass::Engine.new(contents, { syntax: :scss }).render
      when '.hbs', '.handlebars'
        contents = Barber::Ember::FilePrecompiler.call(contents)
        contents = "Ember.TEMPLATES['#{template_name}'] = #{contents}"
      end
      contents
    end

    def template_name
      if helper_args[:name]
        helper_args[:name]
      elsif helper_args[:src]
        name
      elsif helper_args[:dir]
        file.sub("#{working_dir}/#{helper_args[:dir]}/", '').sub(extname, '')
      else
        'name-not-found'
      end
    end

    def generate_file
      FileUtils.mkdir_p "#{build_dir}/#{relative_dir}"
      File.open("#{build_dir}/#{relative_file}", 'a+') { |f| f.write contents }
    end

    def generate_link
      case compiled_ext
      when '.js'
        "<script type='text/javascript' src='#{relative_file}?#{timestamp}'></script>\n"
      when '.css'
        "<link type='text/css' rel='stylesheet' href='#{relative_file}?#{timestamp}' />\n"
      end
    end
  end
end