class ActionView::LogSubscriber

def cache_message(payload) # :doc:
  case payload[:cache_hit]
  when :hit
    "[cache hit]"
  when :miss
    "[cache miss]"
  end
end

def from_rails_root(string) # :doc:
  string = string.sub(rails_root, EMPTY)
  string.sub!(VIEWS_PATTERN, EMPTY)
  string
end

def initialize
  @root = nil
  super
end

def log_rendering_start(payload, name)
  debug do
    qualifier =
      if name == "render_template.action_view"
        ""
      elsif name == "render_layout.action_view"
        "layout "
      end
    return unless qualifier
    message = +"  Rendering #{qualifier}#{from_rails_root(payload[:identifier])}"
    message << " within #{from_rails_root(payload[:layout])}" if payload[:layout]
    message
  end
end

def logger
  ActionView::Base.logger
end

def rails_root # :doc:
  @root ||= "#{Rails.root}/"
end

def render_collection(event)
  identifier = event.payload[:identifier] || "templates"
  debug do
    message = +"  Rendered collection of #{from_rails_root(identifier)}"
    message << " within #{from_rails_root(event.payload[:layout])}" if event.payload[:layout]
    message << " #{render_count(event.payload)} (Duration: #{event.duration.round(1)}ms | Allocations: #{event.allocations})"
    message
  end
end

def render_count(payload) # :doc:
  if payload[:cache_hits]
    "[#{payload[:cache_hits]} / #{payload[:count]} cache hits]"
  else
    "[#{payload[:count]} times]"
  end
end

def render_layout(event)
  info do
    message = +"  Rendered layout #{from_rails_root(event.payload[:identifier])}"
    message << " (Duration: #{event.duration.round(1)}ms | Allocations: #{event.allocations})"
  end
end

def render_partial(event)
  debug do
    message = +"  Rendered #{from_rails_root(event.payload[:identifier])}"
    message << " within #{from_rails_root(event.payload[:layout])}" if event.payload[:layout]
    message << " (Duration: #{event.duration.round(1)}ms | Allocations: #{event.allocations})"
    message << " #{cache_message(event.payload)}" unless event.payload[:cache_hit].nil?
    message
  end
end

def render_template(event)
  info do
    message = +"  Rendered #{from_rails_root(event.payload[:identifier])}"
    message << " within #{from_rails_root(event.payload[:layout])}" if event.payload[:layout]
    message << " (Duration: #{event.duration.round(1)}ms | Allocations: #{event.allocations})"
  end
end

def start(name, id, payload)
  log_rendering_start(payload, name)
  super
end