class BowerVendor::InstallGenerator < Rails::Generators::Base
  source_root Rails.root

  attr_accessor :utils

  class_option :update, type: :boolean, desc: 'Update bower assets (ie - `bower update`)'
  class_option :skip_git_ignore, type: :boolean, desc: 'Add vendored bower asset package directories to .gitignore'
  class_option :force_clean, type: :boolean, desc: 'Clean vendored bower assets without prompting'
  class_option :skip_clean, type: :boolean, desc: 'Skip cleaning vendored bower assets'
  class_option :include_dev_dependencies, type: :boolean, default: false, desc: 'Include bower devDependencies'
  desc 'Vendor bower assets based on bower.json'
  def bower_install
    if !options.skip_clean? and Dir.exist? BowerVendor::BOWER_ROOT
      generate options.force_clean? ? 'bower_vendor:clean --force' : 'bower_vendor:clean'
    end

    action = options.update? ? 'update' : 'install'
    action << ' --production' unless options.include_dev_dependencies?
    say_status :run, "bower #{action}"
    `bower #{action}`

    @utils = BowerVendor::Utils.new

    utils.merged_paths.each do |package, paths|
      append_file '.gitignore', "\n# Vendored bower package '#{package}'\n" unless options.skip_git_ignore?
      case paths
      when Hash
        paths.each do |source, dest|
          vendor_asset(package, File.join(BowerVendor::BOWER_ROOT, package, source), dest)
        end
      when Array
        paths.each do |source|
          vendor_asset(package, File.join(BowerVendor::BOWER_ROOT, package, source))
        end
      when String
        vendor_asset(package, paths)
      else
        raise ArgumentError, "Paths must be either Hash, Array or String, received: #{paths.class}"
      end
    end
  end

  private
  def vendor_asset(package, source, dest=nil)
    file_ext = File.extname(source)
    case file_ext
    when '.js', '.coffee'
      prefix = 'javascripts'
    when '.css', '.scss', '.sass', '.less'
      prefix = 'stylesheets'
    when '.gif', '.png', '.jpg', '.svg'
      prefix = 'images'
    else
      prefix = 'media'
    end

    if dest
      dest = utils.prefixed_path(package, prefix, dest)
    else
      dest = utils.prefixed_path(package, prefix, File.basename(source))
    end
    append_file '.gitignore', "/#{File.join('vendor', 'assets', prefix, package)}\n" unless options.skip_git_ignore?
    copy_file(source, dest)
  end
end