require "yaml"
require "fileutils"

# rake -T
namespace :doc do
  README = "README.adoc".freeze
  INFO   = YAML.load_file("./info.yml")
  MAIN_TITLE = INFO["main_title"]
  SUB_TITLE  = INFO["sub_title"]
  LICENSES   = INFO["licenses"]
  IMAGE      = INFO["image"]
  LINKS      = INFO["links"]
  TOC        = INFO["toc"]

  desc "HelloWorldを出力"
  task :hello do
    puts "HelloWorld"
  end

  desc "info.ymlからディレクトリ作成とREADME.adocをtouch"
  task :touch do
    if TOC.nil? || TOC["sections"].nil?
      exit 0
    end
    TOC["sections"].each do |section|
      section["chapters"].each.with_index(1) do |chapter, idx|
        dir_name = chapter_dir_name(idx, chapter["title"])
        FileUtils.mkdir_p(dir_name)
        chapter_readme_path = "#{dir_name}/#{README}"
        FileUtils.touch(chapter_readme_path)
        puts "[#{Process.pid}] touched #{chapter_readme_path}"
      end
    end
    puts "DONE"
  end

  desc "info.ymlからTemplateを出力"
  task :template do
    puts summary_template
  end

  # rootに置くREADME.adocをINFOから作成
  def summary_template
    content = ["= #{MAIN_TITLE}"]
    if SUB_TITLE && !SUB_TITLE.empty?
      content << " +"
      content << "~#{SUB_TITLE}~"
    end
    if LICENSES
      content << ""
      LICENSES.each do |license|
        if license["image_url"].nil?
          content << ""
          content << "* #{label}: #{body}"
        elsif license["label"].nil?
          content << "image:#{license["image_url"]}[#{license["body"]}]"
        end
      end
    end
    if IMAGE
      content << ""
      content << "image:#{IMAGE["url"]}[#{IMAGE["msg"]||"img"},width=20%]"
    end
    if LINKS
      content << ""
      LINKS.each do |link|
        content << "* link:#{link["url"]}[#{link["msg"]}]"
      end
    end
    if TOC
      content << ""
      if TOC["chapters"]
        TOC["chapters"].each.with_index(1) do |chapter, idx|
          content << ""
          chapter_dir = chapter_dir(idx, chapter["title"])
          line = "include::#{chapter_dir}/#{README}[]"
          content << line
        end
      end
    end
    content.join("\n")
  end

  # タイトルのスペースは-(ハイフン)でつなぐ
  # @return チャプターのディレクトリ名
  def chapter_dir_name(idx, title)
    "ch#{idx.to_s.rjust(2, "0")}_#{title.to_s.gsub(/[[:space:]]/, "-")}"
  end
end