module Gtn::Shortlinks

# File _plugins/gtn/shortlinks.rb, line 12
def self.mapped?(tutorial, current_mapping)
  current_mapping['id'].values.include? tutorial
end

# File _plugins/gtn/shortlinks.rb, line 16
def self.update(current_mapping)
  current_mapping['id'] = {} if !current_mapping.key? 'id'

  current_mapping['name'] = {} if !current_mapping.key? 'name'

  # Discover tutorials
  Dir.glob('topics/*/tutorials/*/tutorial.md').each do |tutorial|
    html_path = "/#{tutorial.gsub(/md$/, 'html')}"
    # If it's not already mapped by a key, add it.
    if !mapped?(html_path, current_mapping)
      # Generate a short code
      short_code_number = current_mapping['id'].select { |x| x[0] == CATEGORY_TUTORIAL }.length.to_s.rjust(5, '0')
      short_code = CATEGORY_TUTORIAL + short_code_number
      puts "Discovered tutorial #{short_code}"
      # If the target of this flavour of short code isn't already in here, then add it
      current_mapping['id'][short_code] = html_path
    end

    # Also generate one from topic/tutorial name
    # These are idempotent and safe
    short_code2 = tutorial.split('/')[1..3].join('/').gsub(%r{/tutorials}, '')
    current_mapping['name'][short_code2] = "/#{tutorial.gsub(/md$/, 'html')}"
  end

  # Discover slides
  Dir.glob('topics/*/tutorials/*/slides.html').each do |tutorial|
    html_path = "/#{tutorial}"
    # If it's not already mapped by a key, add it.
    if !mapped?(html_path, current_mapping)
      # Generate a short code
      short_code_number = current_mapping['id'].select { |x| x[0] == CATEGORY_SLIDES }.length.to_s.rjust(5, '0')
      short_code = CATEGORY_SLIDES + short_code_number
      puts "Discovered slides #{short_code}"
      # If the target of this flavour of short code isn't already in here, then add it
      current_mapping['id'][short_code] = html_path
    end

    # Also generate one from topic/tutorial name
    # These are idempotent and safe
    short_code2 = "#{tutorial.split('/')[1..3].join('/').gsub(%r{/tutorials}, '')}/slides"
    current_mapping['name'][short_code2] = "/#{tutorial.gsub(/md$/, 'html')}"
  end

  # Discover FAQs
  all_faqs = Dir.glob('faqs/**/*.md') + Dir.glob('topics/*/faqs/**/*.md') + \
             Dir.glob('topics/*/tutorials/*/faqs/*.md')
  # Remove symlinked files
  all_faqs = all_faqs.reject { |x| File.symlink?(x) }
  # Reject indexes, readme, etc.
  all_faqs = all_faqs.grep_v(/index.md$/)
  all_faqs = all_faqs.grep_v(/README.md$/)

  all_faqs.each do |tutorial|
    html_path = "/#{tutorial.gsub(/md$/, 'html')}"
    # If it's not already mapped by a key, add it.
    if !mapped?(html_path, current_mapping)
      # Generate a short code
      short_code_number = current_mapping['id'].select { |x| x[0] == CATEGORY_FAQ }.length.to_s.rjust(5, '0')
      short_code = CATEGORY_FAQ + short_code_number
      puts "Discovered FAQ #{short_code}"
      # If the target of this flavour of short code isn't already in here, then add it
      current_mapping['id'][short_code] = html_path
    end
  end

  # Discover news
  Dir.glob('news/_posts/*.md').each do |material|
    m = material.match(%r{news/_posts/(?<year>\d\d\d\d)-(?<month>\d\d)-(?<day>\d\d)-(?<title>.*)\.md})
    html_path = "/news/#{m[:year]}/#{m[:month]}/#{m[:day]}/#{m[:title]}.html"
    # If it's not already mapped by a key, add it.
    if !mapped?(html_path, current_mapping)
      # Generate a short code
      short_code_number = current_mapping['id'].select { |x| x[0] == CATEGORY_NEWS }.length.to_s.rjust(5, '0')
      short_code = CATEGORY_NEWS + short_code_number
      puts "Discovered news #{short_code}"
      # If the target of this flavour of short code isn't already in here, then add it
      current_mapping['id'][short_code] = html_path
    end
  end

  # Discover learning pathways
  lps = Dir.glob('learning-pathways/*.md')
  lps.reject! { |t| t =~ /index.md/ }
  lps.reject! { |t| t =~ /pathway-example.md/ }

  lps.each do |tutorial|
    html_path = "/#{tutorial.gsub(/md$/, 'html')}"
    # If it's not already mapped by a key, add it.
    if !mapped?(html_path, current_mapping)
      # Generate a short code
      short_code_number = current_mapping['id'].select { |x| x[0] == CATEGORY_PATHWAYS }.length.to_s.rjust(5, '0')
      short_code = CATEGORY_PATHWAYS + short_code_number
      puts "Discovered slides #{short_code}"
      # If the target of this flavour of short code isn't already in here, then add it
      current_mapping['id'][short_code] = html_path
    end
  end

  current_mapping
end