module SvelteOnRails::ViewHelpers

def cached_svelte_component(path, props = {}, html: {}, options: {})
  support = SvelteOnRails::Lib::ViewHelperSupport.new(path, props, html, options, request, true)
  log_message = '?'
  redis = support.conf.redis_instance
  cached_content = redis.get(support.cache_key)
  # TTL
  if support.debug?
    support.debug_log("Rendering component: «#{filename}», cache_key: «#{support.custom_cache_key}»")
    support.debug_log("Redis configuration: #{support.conf.redis_cache_store}")
    ttl = redis.ttl(support.cache_key)
    key_stat = if cached_content.present?
                 'has content'
               elsif redis.exists(support.cache_key)
                 'exists but no content'
               else
                 'not exists'
               end
    ttl_stat = if redis.exists(support.cache_key)
                 ", ttl was: #{ttl} seconds, now set to: #{support.redis_expiration_seconds} seconds"
               end
    support.debug_log("Cache key: «#{support.cache_key}» (#{key_stat}#{ttl_stat})")
  end
  redis.expire(support.cache_key, support.redis_expiration_seconds)
  res = if cached_content
          log_message = "Returned #{support.filename}.svelte from cache"
          cached_content.html_safe
        else
          log_message = "Rendered #{support.filename}.svelte and stored to cache"
          support.debug_log("cache recalculating for key: #{support.cache_key}")
          r = render_component(support)
          support.debug_log("cache recalculated")
          # redis.scan_each(match: "#{support.cache_key_primary}:*") do |key|
          #   redis.del(key)
          #   support.debug_log("deleted cache, pattern: «#{support.cache_key_primary}:*»,  key: #{key.sub("#{support.cache_key_primary}:", '[..]')}")
          # end
          redis.set(support.cache_key, r)
          r
        end
  support.log_rendering(log_message)
  res
end

def render_component(support)
  if support.ssr?
    ssr_result = support.render_ssr
    content_tag(:div, support.html_options) do
      concat(content_tag(:style, ssr_result['css'], type: 'text/css'))
      concat(ssr_result['html'].html_safe)
    end
  else
    content_tag(:div, support.html_options) {}
  end
end

def svelte_component(path, props = {}, html: {}, options: {})
  support = SvelteOnRails::Lib::ViewHelperSupport.new(path, props, html, options, request, false)
  support.debug_log("Rendering component: #{path}")
  log_message = '?'
  log_message = "Rendered #{support.filename}.svelte #{'as empty element that will be mounted on the client side' unless support.ssr?}"
  res = render_component(support)
  support.log_rendering(log_message)
  res
end