class RubyProf::CallStackPrinter

def application
  @options[:application] || $PROGRAM_NAME
end

def arguments
  ARGV.join(' ')
end

def base64_image
  @data ||= begin
    file = open_asset('call_stack_printer.png')
    Base64.encode64(file).gsub(/\n/, '')
  end
end

def color(p)
  case i = p.to_i
  when 0..5
    "01"
  when 5..10
    "05"
  when 100
    "9"
  else
    "#{i/10}"
  end
end

def dump(ci)
  $stderr.printf "%s/%d t:%f s:%f w:%f  \n", ci, ci.object_id, ci.total_time, ci.self_time, ci.wait_time
end

def expansion
  @options[:expansion] || 10.0
end

def graph_link(call_tree)
  total_calls = call_tree.target.called
  totals = total_calls.to_s
  "[#{call_tree.called} calls, #{totals} total]"
end

def link(method, recursive)
  method_name = "#{recursive ? '*' : ''}#{method.full_name}"
  if method.source_file.nil?
    h method_name
  else
    file = File.expand_path(method.source_file)
   "<a href=\"file://#{file}##{method.line}\">#{h method_name}</a>"
  end
end

def method_href(method)
  h(method.full_name.gsub(/[><#\.\?=:]/,"_"))
end

def name(call_tree)
  method = call_tree.target
  method.full_name
end

def print(output = STDOUT, options = {})
  setup_options(options)
  output << @erb.result(binding)
end

def print_stack(output, visited, call_tree, parent_time)
  total_time = call_tree.total_time
  percent_parent = (total_time/parent_time)*100
  percent_total = (total_time/@overall_time)*100
  return unless percent_total > min_percent
  color = self.color(percent_total)
  visible = percent_total >= threshold
  expanded = percent_total >= expansion
  display = visible ? "block" : "none"
  output << "<li class=\"color#{color}\" style=\"display:#{display}\">" << "\n"
  if visited.include?(call_tree)
    output << "<a href=\"#\" class=\"toggle empty\" ></a>" << "\n"
    output << "<span>%s %s</span>" % [link(call_tree.target, true), graph_link(call_tree)] << "\n"
  else
    visited << call_tree
    if call_tree.children.empty?
      output << "<a href=\"#\" class=\"toggle empty\" ></a>" << "\n"
    else
      visible_children = call_tree.children.any?{|ci| (ci.total_time/@overall_time)*100 >= threshold}
      image = visible_children ? (expanded ? "minus" : "plus") : "empty"
      output << "<a href=\"#\" class=\"toggle #{image}\" ></a>" << "\n"
    end
    output << "<span>%4.2f%% (%4.2f%%) %s %s</span>" % [percent_total, percent_parent,
                                                        link(call_tree.target, false), graph_link(call_tree)] << "\n"
    unless call_tree.children.empty?
      output <<  (expanded ? '<ul>' : '<ul style="display:none">')  << "\n"
      call_tree.children.sort_by{|c| -c.total_time}.each do |child_call_tree|
        print_stack(output, visited, child_call_tree, total_time)
      end
      output << '</ul>' << "\n"
    end
    visited.delete(call_tree)
  end
  output << '</li>' << "\n"
end

def setup_options(options)
  super(options)
  @erb = ERB.new(self.template)
end

def sum(a)
  a.inject(0.0){|s,t| s+=t}
end

def template
  open_asset('call_stack_printer.html.erb')
end

def threshold
  @options[:threshold] || 1.0
end

def title
  @title ||= @options.delete(:title) || "ruby-prof call tree"
end

def total_time(call_trees)
  sum(call_trees.map{|ci| ci.total_time})
end