class SplitIoClient::Cache::Adapters::CacheAdapter

def add(key, value)
  @cache[key] = value.to_s unless value.nil?
end

def add_to_map(key, field, value)
  initialize_map(key) unless get(key)
  get(key).put(field.to_s, value.to_s)
end

def add_to_set(key, values)
  if values.is_a? Array
    values.each { |value| add_to_map(key, value, 1) }
  else
    add_to_map(key, values, 1)
  end
  @adapter.add_to_set(key, values)
end

def clear(namespace_key)
  @cache.clear
end

def delete(key)
  @cache.delete(key)
  @adapter.delete(key)
end

def delete_from_set(key, fields)
  cached_value = get(key)
  if cached_value
    if fields.is_a? Array
      fields.each { |field| cached_value.delete(field) }
    else
      cached_value.delete(fields)
    end
  end
  @adapter.delete_from_set(key, fields)
end

def exists?(key)
  cached_value = get(key)
  if cached_value.nil?
    @adapter.exists?(key)
  else
    true
  end
end

def find_strings_by_prefix(prefix)
  @adapter.find_strings_by_prefix(prefix)
end

def get(key)
  @cache[key]
end

def get_set(key)
  cached_value = get(key)
  if cached_value.nil?
    return @adapter.get_set(key)
  end
  cached_value.keys
end

def in_set?(key, field)
  cached_value = get(key)
  if cached_value.nil?
    return @adapter.in_set?(key, field)
  end
  cached_value.key?(field)
end

def initialize(config)
  @cache = LruRedux::TTL::ThreadSafeCache.new(config.max_cache_size, config.cache_ttl)
  @adapter = config.cache_adapter
end

def initialize_map(key)
  @cache[key] = Concurrent::Map.new
end

def multiple_strings(keys)
  cached_values = keys.each_with_object({}) do |key, memo|
     memo[key] = get(key)
  end
  non_cached_keys = []
  cached_values.delete_if{ |k,v| v.nil? ? non_cached_keys << k : false }
  if non_cached_keys.any?
    new_values = @adapter.multiple_strings(non_cached_keys)
    new_values.keys.each do |key, value|
      add(key, value)
    end
    cached_values.merge!(new_values)
  end
  cached_values
end

def set_string(key, value)
  add(key, value)
  @adapter.set_string(key, value)
end

def string(key)
  value = get(key)
  return value if value
  value = @adapter.string(key)
  add(key, value)
  value
end