require 'yaml'
require 'erb'
require 'pathname'

module Hashie
  module Extensions
    module Parsers
      class YamlErbParser
        def initialize(file_path, options = {})
          @content = File.read(file_path)
          @file_path = file_path.is_a?(Pathname) ? file_path.to_s : file_path
          @options = options
        end

        def perform
          template = ERB.new(@content)
          template.filename = @file_path
          permitted_classes = @options.fetch(:permitted_classes) { [] }
          permitted_symbols = @options.fetch(:permitted_symbols) { [] }
          aliases = @options.fetch(:aliases) { true }
          # TODO: Psych in newer rubies expects these args to be keyword args.
          YAML.safe_load template.result, permitted_classes, permitted_symbols, aliases
        end

        def self.perform(file_path, options = {})
          new(file_path, options).perform
        end
      end
    end
  end
end