module Roda::RodaPlugins::Render

def self.configure(app, opts=OPTS)
  if app.opts[:render]
    orig_cache = app.opts[:render][:cache]
    opts = app.opts[:render][:orig_opts].merge(opts)
  end
  app.opts[:render] = opts.dup
  app.opts[:render][:orig_opts] = opts
  opts = app.opts[:render]
  opts[:engine] = (opts[:engine] || opts[:ext] || "erb").dup.freeze
  opts[:views] = app.expand_path(opts[:views]||"views").freeze
  opts[:allowed_paths] ||= [opts[:views]].freeze
  opts[:allowed_paths] = opts[:allowed_paths].map{|f| app.expand_path(f, nil)}.uniq.freeze
  if opts.fetch(:cache, true)
    if orig_cache
      opts[:cache] = orig_cache
    elsif cache_class = opts[:cache_class]
      opts[:cache] = cache_class.new
    else
      opts[:cache] = app.thread_safe_cache
    end
  end
  opts[:explicit_cache] = ENV['RACK_ENV'] == 'development' unless opts.has_key?(:explicit_cache)
  opts[:layout_opts] = (opts[:layout_opts] || {}).dup
  opts[:layout_opts][:_is_layout] = true
  if opts[:layout_opts][:merge_locals] && opts[:locals]
    opts[:layout_opts][:locals] = opts[:locals].merge(opts[:layout_opts][:locals] || {})
  end
  if layout = opts.fetch(:layout, true)
    opts[:layout] = true unless opts.has_key?(:layout)
    case layout
    when Hash
      opts[:layout_opts].merge!(layout)
    when true
      opts[:layout_opts][:template] ||= 'layout'
    else
      opts[:layout_opts][:template] = layout
    end
  end
  opts[:layout_opts].freeze
  template_opts = opts[:template_opts] = (opts[:template_opts] || {}).dup
  template_opts[:outvar] ||= '@_out_buf'
  if RUBY_VERSION >= "1.9" && !template_opts.has_key?(:default_encoding)
    template_opts[:default_encoding] = Encoding.default_external
  end
  if opts[:escape] == :erubi
    require 'tilt/erubi'
    template_opts[:escape] = true
  elsif opts[:escape]
    template_opts[:engine_class] = ErubisEscaping::Eruby
    opts[:escaper] ||= if opts[:escape_safe_classes]
      ErubisEscaping::UnsafeClassEscaper.new(opts[:escape_safe_classes])
    else
      ::Erubis::XmlHelper
    end
  end
  template_opts.freeze
  engine_opts = opts[:engine_opts] = (opts[:engine_opts] || {}).dup
  engine_opts.to_a.each do |k,v|
    engine_opts[k] = v.dup.freeze
  end
  engine_opts.freeze
  opts.freeze
end

def self.load_dependencies(app, opts=OPTS)
  if opts[:escape] && opts[:escape] != :erubi
    app.plugin :_erubis_escaping
  end
end