class Cache

# File lib/whimsy/cache.rb, line 22
def initialize(dir: '/tmp/whimsy-cache',
      minage: 3000, # 50 mins
      enabled: true,
      save_csp: false)
  if dir.start_with?('/')
    @dir = dir
  else
    @dir = File.join('/tmp/whimsy-cache', dir)
  end
  @enabled = enabled
  @minage = minage
  @save_csp = save_csp
  init_cache(@dir) if enabled
end

# File lib/whimsy/cache.rb, line 38
def enabled=(enabled)
  @enabled = enabled
  init_cache(@dir) if enabled
end

# File lib/whimsy/cache.rb, line 51
def get(url)
  if not @enabled
    uri, res = fetch(url)
    if @save_csp
      return uri, res.body, 'nocache', res.header['content-security-policy']
    else
      return uri, res.body, 'nocache'
    end
  end

  # Check the cache
  age, lastmod, uri, etag, data, csp = read_cache(url)
  Wunderbar.debug "#{uri} #{age} LM=#{lastmod} ET=#{etag}"
  if age < minage
    if @save_csp
      return uri, data, 'recent', csp # we have a recent cache entry
    else
      return uri, data, 'recent' # we have a recent cache entry
    end
  end

  # Try to do a conditional get (unless csp is missing)
  if data and (lastmod or etag) and (csp or !@save_csp)
    cond = {}
    cond['If-Modified-Since'] = lastmod if lastmod
    cond['If-None-Match'] = etag if etag
    uri, res = fetch(url, cond)
    if res.is_a?(Net::HTTPSuccess)
      write_cache(url, res)
      if @save_csp
        return uri, res.body, 'updated', res.header['content-security-policy']
      else
        return uri, res.body, 'updated'
      end
    elsif res.is_a?(Net::HTTPNotModified)
      path = makepath(url)
      mtime = Time.now
      File.utime(mtime, mtime, path) # show we checked the page
      if @save_csp
        return uri, data, 'unchanged', csp
      else
        return uri, data, 'unchanged'
      end
    else
      return nil, res, 'error'
    end
  else
    uri, res = fetch(url)
    if res.is_a?(Net::HTTPSuccess)
      write_cache(url, res)
      if @save_csp
        return uri, res.body, data ? 'no last mod/etag' : 'cachemiss', res.header['content-security-policy']
      else
        return uri, res.body, data ? 'no last mod/etag' : 'cachemiss'
      end
    else
      return nil, res, 'error'
    end
  end
end