require "autostruct/wrap"
require "fileutils"

require "middleman/caching_proxy/cache_manifest"

module Middleman::CachingProxy
  class Cache
    def initialize(path:, key:)
      @manifest = nil
    end
    include Autostruct::Wrap

    def has?(item)
      cached_path = full_path(item: item)
      return false if !File.exist?(cached_path)
      manifest.has?(item)
    end

    def add(item:, source:)
      manifest.add item
      cached_path = full_path(item: item)
      copy_in source, cached_path
    end

    def full_path(item:)
      File.join(path, "items", item.path)
    end

    def save
      manifest.save
    end

    private

    def manifest
      @manifest ||= CacheManifest.new(
        path: path, key: key
      )
    end

    def copy_in(source, cached_path)
      cache_subdirectory = File.dirname(cached_path)
      FileUtils.mkdir_p cache_subdirectory

      FileUtils.cp source, cached_path
    end
  end
end