require 'jsduck/logger'
require 'jsduck/util/io'
require 'jsduck/tag_registry'
require 'fileutils'

module JsDuck
  module Web

    # Deals with creation of main HTML or PHP files.
    class IndexHtml
      def initialize(assets, opts, paths={})
        @assets = assets
        @opts = opts
        @paths = paths
      end

      # In normal mode creates index.html.
      #
      # When --seo enabled, creates index.php, template.html and print-template.html.
      def write
        if @opts.seo
          FileUtils.cp(@opts.template_dir+"/index.php", @opts.output_dir+"/index.php")
          create_template_html(@opts.template_dir+"/template.html", @opts.output_dir+"/template.html")
          create_print_template_html(@opts.template_dir+"/print-template.html", @opts.output_dir+"/print-template.html")
          create_index_template_html(@opts.template_dir+"/index-template.html", @opts.output_dir+"/index-template.html")
        else
          create_template_html(@opts.template_dir+"/template.html", @opts.output_dir+"/index.html")
        end
      end

      private

      def create_template_html(in_file, out_file)
        write_template(in_file, out_file, {
          "{title}" => @opts.title,
          "{mobile_redirect}" => @opts.seo ? include_script(@opts.template_dir+"/mobile-redirect.js") : "",
          "{header}" => @opts.header,
          "{footer}" => "<div id='footer-content' style='display: none'>#{@opts.footer}</div>",
          "{extjs_path}" => @opts.extjs_path,
          "{data_path}" => File.basename(@paths[:data]),
          "{css_path}" => File.basename(@paths[:css]),
          "{welcome}" => @assets.welcome.to_html("display:none"),
          "{categories}" => @assets.categories.to_html("display:none"),
          "{news}" => @assets.news.to_html("display:none"),
          "{guides}" => @assets.guides.to_html("display:none"),
          "{head_html}" => @opts.head_html,
          "{body_html}" => @opts.body_html,
        })
      end

      def create_print_template_html(in_file, out_file)
        write_template(in_file, out_file, {
          "{title}" => @opts.title,
          "{header}" => @opts.header,
          "{css_path}" => File.basename(@paths[:css]),
        })
      end

      def create_index_template_html(in_file, out_file)
        categories = @assets.categories.to_html
        guides = @assets.guides.to_html

        write_template(in_file, out_file, {
          "{title}" => @opts.title,
          "{header}" => @opts.header,
          "{categories}" => categories ? "<h1>API Documentation</h1> #{categories}" : "",
          "{guides}" => guides ? "<h1>Guides</h1> #{guides}" : "",
          "{css_path}" => File.basename(@paths[:css]),
        })
      end

      def include_script(filename)
        "<script type='text/javascript'>\n" + Util::IO.read(filename) + "\n</script>"
      end

      # Opens in_file, replaces {keys} inside it, writes to out_file
      def write_template(in_file, out_file, replacements)
        Logger.log("Writing", out_file)
        html = Util::IO.read(in_file)
        html.gsub!(/\{\w+\}/) do |key|
          replacements[key] ? replacements[key] : key
        end
        File.open(out_file, 'w') {|f| f.write(html) }
      end

    end

  end
end