require 'jsduck/logger'
require 'jsduck/json_duck'
require 'fileutils'

module JsDuck

  # Reads in guides and converts them to JsonP files
  class Guides
    def initialize(formatter)
      @formatter = formatter
      @guides = []
    end

    # Parses guides config file
    def parse(filename)
      @path = File.dirname(filename)
      @guides = JsonDuck.read(filename)
    end

    # Writes all guides to given dir in JsonP format
    def write(dir)
      return if @guides.length == 0

      FileUtils.mkdir(dir) unless File.exists?(dir)
      @guides.each {|group| group["items"].each {|g| write_guide(g, dir) } }
      # Write the JSON to output dir, so it's available in released
      # version of docs and people can use it with JSDuck by themselves.
      JsonDuck.write_json(dir+"/guides.json", @guides)
    end

    def write_guide(guide, dir)
      in_dir = @path + "/" + guide["name"]
      out_dir = dir + "/" + guide["name"]
      return Logger.instance.warn("Guide #{in_dir} not found") unless File.exists?(in_dir)
      guide_file = in_dir + "/README.md"
      return Logger.instance.warn("README.md not found in #{in_dir}") unless File.exists?(guide_file)

      Logger.instance.log("Writing guide #{out_dir} ...")
      # Copy the whole guide dir over
      FileUtils.cp_r(in_dir, out_dir)

      @formatter.doc_context = {:filename => guide_file, :linenr => 0}
      html = @formatter.format(IO.read(guide_file))
      name = File.basename(in_dir)
      html.gsub!(/<img src="/, "<img src=\"guides/#{name}/")

      JsonDuck.write_jsonp(out_dir+"/README.js", name, {:guide => html, :title => guide["title"]})
    end

    # Returns all guides as array
    def to_array
      @guides
    end

    # Returns HTML listing of guides
    def to_html
      return "" if @guides.length == 0

      html = @guides.map do |group|
        [
          "<h3>#{group['title']}</h3>",
          "<ul>",
          group["items"].map {|g| "<li><a href='#!/guide/#{g['name']}'>#{g['title']}</a></li>" },
          "</ul>",
        ]
      end.flatten.join("\n")

      return <<-EOHTML
        <div id='guides-content' style='display:none'>
            #{html}
        </div>
      EOHTML
    end
  end

end