# Loads webpacker configuration from config/webpacker.yml

require "webpacker/file_loader"

class Webpacker::Configuration < Webpacker::FileLoader
  class << self
    def reset
      @defaults = nil
      super
    end

    def entry_path
      source_path.join(fetch(:source_entry_path))
    end

    def public_output_path
      fetch(:public_output_path)
    end

    def output_path
      public_path.join(public_output_path)
    end

    def manifest_path
      output_path.join("manifest.json")
    end

    def source_path
      Rails.root.join(source)
    end

    def public_path
      Rails.root.join("public")
    end

    def file_path(root: Rails.root)
      root.join("config/webpacker.yml")
    end

    def default_file_path
      file_path(root: Pathname.new(__dir__).join("../install"))
    end

    def source
      fetch(:source_path)
    end

    def compile?
      fetch(:compile)
    end

    def fetch(key)
      data.fetch(key, defaults[key])
    end

    def data
      load_instance if Webpacker.env.development?
      raise Webpacker::FileLoader::FileLoaderError.new("Webpacker::Configuration.load_data must be called first") unless instance
      instance.data
    end

    def defaults
      @defaults ||= HashWithIndifferentAccess.new(YAML.load(default_file_path.read)[Webpacker.env])
    end

    # Uses the webpack dev server host if appropriate
    def output_path_or_url
      if Webpacker::DevServer.dev_server?
        Webpacker::DevServer.base_url
      else
        # Ensure we start with a slash so that the asset helpers don't prepend the default asset
        # pipeline locations.
        public_output_path.starts_with?("/") ? public_output_path : "/#{public_output_path}"
      end
    end
  end

  private
    def load_data
      return Webpacker::Configuration.defaults unless File.exist?(@path)
      HashWithIndifferentAccess.new(YAML.load(File.read(@path))[Webpacker.env])
    end
end