# frozen_string_literal: true

module Nanoc
  module Int
    class Compiler
      module Phases
        # Provides functionality for (re)calculating the content of an item rep, with caching or
        # outdatedness checking. Delegates to s::Recalculate if outdated or no cache available.
        class Cache < Abstract
          include Nanoc::Core::ContractsSupport

          def initialize(wrapped:, compiled_content_cache:, compiled_content_store:)
            super(wrapped: wrapped)

            @compiled_content_cache = compiled_content_cache
            @compiled_content_store = compiled_content_store
          end

          contract Nanoc::Core::ItemRep, C::KeywordArgs[is_outdated: C::Bool], C::Func[C::None => C::Any] => C::Any
          def run(rep, is_outdated:)
            if can_reuse_content_for_rep?(rep, is_outdated: is_outdated)
              Nanoc::Core::NotificationCenter.post(:cached_content_used, rep)

              @compiled_content_store.set_all(rep, @compiled_content_cache[rep])
            else
              yield
            end

            rep.compiled = true
            @compiled_content_cache[rep] = @compiled_content_store.get_all(rep)
          end

          contract Nanoc::Core::ItemRep, C::KeywordArgs[is_outdated: C::Bool] => C::Bool
          def can_reuse_content_for_rep?(rep, is_outdated:)
            if is_outdated
              false
            else
              @compiled_content_cache.full_cache_available?(rep)
            end
          end
        end
      end
    end
  end
end