class Zenweb::Page

# File lib/zenweb/page.rb, line 46
def self.renderers_re
  @renderers_re ||=
    begin
      ext = instance_methods.grep(/^render_/).map { |s|
        s.to_s.sub(/render_/, '')
      }
      /(?:\.(#{ext.join "|"}))+$/
    end
end

# File lib/zenweb/page.rb, line 72
def [] k
  warn("#{self.url} does not define #{k.inspect}") unless config.key?(k)
  config[k]
end

# File lib/zenweb/page.rb, line 80
def all_subpages reversed = false
  dated, normal = subpages.partition(&:dated_path?)
  dated = dated.reverse if reversed

  (normal + dated).map { |p| [p, p.all_subpages(reversed)] }
end

# File lib/zenweb/page.rb, line 91
def all_subpages_by_level reversed = false
  self.all_subpages(reversed).deep_each.map { |n, p| [(n-1)/2, p] }
end

# File lib/zenweb/plugins/google.rb, line 64
def analytics
  [google_analytics, gauges_analytics].compact.join "\n\n"
end

# File lib/zenweb/page.rb, line 98
def body
  # TODO: add a test for something with --- without a yaml header.
  @body ||= begin
              thing = File.file?(path) ? path : self
              _, body = Zenweb::Config.split thing
              body.strip
            end
end

# File lib/zenweb/page.rb, line 118
def breadcrumbs
  pages = [self]
  loop do
    parent = pages.first.parent
    break unless parent and parent != pages.first
    pages.unshift parent
  end
  pages.pop # take self back off
  pages
end

# File lib/zenweb/page.rb, line 193
def change_frequency
  return config["change_frequency"] if config["change_frequency"]

  days_old = (Time.now - self.date).to_i / 86400

  case days_old
  when 0...14 then
    "daily"
  when 14...56 then
    "weekly"
  when 56...365 then
    "monthly"
  else
    "yearly"
  end
end

# File lib/zenweb/page.rb, line 132
def clean_url
  url.sub(/\/index.html$/, '/')
end

# File lib/zenweb/page.rb, line 141
def config
  unless defined? @config then
    @config = Config.new site, path
    @config = @config.parent unless content.start_with? "---"
  end
  @config
end

# File lib/zenweb/page.rb, line 152
def content
  # TODO: this has the same drawbacks as Config.split
  @content ||= File.read path
end

# File lib/zenweb/page.rb, line 164
def date
  config['date'] || date_from_path || File.stat(path).mtime
end

# File lib/zenweb/page.rb, line 174
def date_str
  fmt ||= self.config["date_fmt"] || "%Y-%m" # REFACTOR: yuck
  self.date.strftime fmt
end

# File lib/zenweb/page.rb, line 182
def dated?
  config['date'] || date_from_path
end

# File lib/zenweb/page.rb, line 189
def dated_path?
  path[/\d\d\d\d[-\/]\d\d[-\/]\d\d/] || path[/\d\d\d\d(?:[-\/]\d\d)?\/index/]
end

# File lib/zenweb/page.rb, line 222
def depends_on deps
  if String === deps then
    file self.path => deps
  else
    deps = deps.values if Hash === deps
    deps = Array(deps)

    file self.url_path => deps.map(&:url_path) - [self.url_path]
  end
end

# File lib/zenweb/plugins/disqus.rb, line 6
def disqus shortname
  '<div id="disqus_thread"></div>' +
    run_js_script("https://#{shortname}.disqus.com/embed.js")
end

# File lib/zenweb/plugins/disqus.rb, line 15
def disqus_counts shortname
  run_js_script "https://#{shortname}.disqus.com/count.js"
end

# File lib/zenweb/plugins/erb.rb, line 24
def erb content, source, binding = TOPLEVEL_BINDING
  require 'erb'
  extend ERB::Util

  unless defined? @erb then
    content = content.
      gsub(/\{\{/, "<%=").
      gsub(/\}\}/, "%>").
      gsub(/\{%/,  "<%").
      gsub(/%\}/,  "%>").
      gsub(/\\([{}%])/, '\1')

    @erb = if RUBY_VERSION >= "2.6.0" then
             ERB.new(content, trim_mode:"-")
           else
             ERB.new(content, nil, "-")
           end
  end

  @erb.filename = source.inspect
  @erb.result binding
end

# File lib/zenweb/plugins/markdown.rb, line 26
def extend_md
  extend Zenweb::Page::MarkdownHelpers
end

# File lib/zenweb/page.rb, line 237
def filetype name = self.path
  File.extname(name)[1..-1]
end

# File lib/zenweb/page.rb, line 251
def filetypes
  @filetypes ||= path[self.class.renderers_re].split(/\./)[1..-1].reverse
rescue
  []
end

# File lib/zenweb/page.rb, line 260
def format_date s
  fmt = self.config["date_fmt"] || "%Y/%m/%d"
  Time.local(*s.split(/-/).map(&:to_i)).strftime(fmt)
end

# File lib/zenweb/plugins/google.rb, line 44
  def gauges_analytics
    if site.config["gauges_id"] then
      <<-"EOM".gsub(/^ {8}/, '')
        <script type="text/javascript">
          var _gauges = _gauges || [];
          (function() {
            var t   = document.createElement('script');
            t.type  = 'text/javascript';
            t.async = true;
            t.id    = 'gauges-tracker';
            t.setAttribute('data-site-id', '#{site.gauges_id}');
            t.src = '//secure.gaug.es/track.js';
            var s = document.getElementsByTagName('script')[0];
            s.parentNode.insertBefore(t, s);
          })();
        </script>
      EOM
    end
  end

# File lib/zenweb/page.rb, line 268
def generate
  warn "Rendering #{url_path}"

  content = self.render

  open url_path, "w" do |f|
    f.puts content
  end
end

# File lib/zenweb/plugins/google.rb, line 7
  def google_ad slot, width = 468, height = 60
    <<-"EOM".gsub(/^ {6}/, '')
      <script><!--
      google_ad_client = "#{self["google_ad_client"]}";
      google_ad_slot   = "#{slot}";
      google_ad_width  = #{width};
      google_ad_height = #{height};
      //-->
      </script>
      <script src="http://pagead2.googlesyndication.com/pagead/show_ads.js">
      </script>
    EOM
  end

# File lib/zenweb/plugins/google.rb, line 21
  def google_analytics
    if site.config["google_ua"] then
      <<-"EOM".gsub(/^ {8}/, '')
        <script type="text/javascript">
          var _gaq = _gaq || [];
          _gaq.push(['_setAccount', '#{site.google_ua}']);
          _gaq.push(['_trackPageview']);

          (function() {
          var ga = document.createElement('script');
          ga.type = 'text/javascript';
          ga.async = true;
          ga.src = ('https:' == document.location.protocol ?
                    'https://ssl' : 'http://www') +
                   '.google-analytics.com/ga.js';
          (document.getElementsByTagName('head')[0] ||
           document.getElementsByTagName('body')[0]).appendChild(ga);
          })();
        </script>
      EOM
    end
  end

# File lib/zenweb/page.rb, line 213
def html?
  path =~ /\.html/
end

# File lib/zenweb/page.rb, line 283
def include name, page
  incl = Page.new(site, File.join("_includes", name))
  incl.subrender page
end

# File lib/zenweb/page.rb, line 291
def index?
  url.end_with? "index.html"
end

# File lib/zenweb/page.rb, line 304
def layout
  unless defined? @layout then
    @layout = site.layout self.config["layout"]
  end
  @layout
rescue => e
  raise e.exception "%s for page %p" % [e.message, path]
end

# File lib/zenweb/page.rb, line 331
def link_head **kws
  %(<link #{kws.map { |k,v| "#{k}=#{v.inspect}" }.join " "} />)
end

# File lib/zenweb/page.rb, line 316
def link_html title = self.title
  %(<a href="#{clean_url}">#{title}</a>)
end

# File lib/zenweb/plugins/markdown.rb, line 36
def markdown content, no_line_numbers = false
  require "kramdown"
  require "kramdown-parser-gfm"
  require "kramdown-syntax-coderay"
  require "coderay/zenweb_extensions"

  config = KRAMDOWN_CONFIG.dup
  if no_line_numbers then
    config[:syntax_highlighter_opts] = config[:syntax_highlighter_opts].dup
    config[:syntax_highlighter_opts][:line_numbers] = nil
  end

  Kramdown::Document.new(content, config).to_html
end

# File lib/zenweb/page.rb, line 323
def meta key, name=key, label="name"
  val = self.config[key]
  %(<meta #{label}="#{name}" content="#{val}">) if val
end

# File lib/zenweb/page.rb, line 353
def no_index?
  config["no_index"]
end

# File lib/zenweb/page.rb, line 110
def parent_url url = self.url
  url = File.dirname url if File.basename(url) == "index.html"
  File.join File.dirname(url), "index.html"
end

# File lib/zenweb/page.rb, line 361
def render page = self, content = nil
  content = subrender page, content

  layout  = self.layout # TODO: make nullpage to avoid 'if layout' tests
  content = layout.render page, content if layout

  content
end

# File lib/zenweb/plugins/erb.rb, line 5
def render_erb page, content
  erb body, self, binding
end

# File lib/zenweb/plugins/less.rb, line 5
def render_less page, content
  require "less"

  Less::Parser.new.parse(content || body).to_css
end

# File lib/zenweb/plugins/markdown.rb, line 21
def render_md page, content
  no_line_numbers = page.config["no_line_numbers"]
  markdown(content || self.body, no_line_numbers)
end

# File lib/zenweb/page.rb, line 395
    def run_js_script url
      <<-"EOM".gsub(/^ {6}/, '')
      <script type="text/javascript">
        (function() {
          var s   = document.createElement('script');
          s.type  = 'text/javascript';
          s.async = true;
          s.src   = '#{url}';
          (document.getElementsByTagName('head')[0] || document.getElementsByTagName('body')[0]).appendChild(s);
        })();
      </script>
      EOM
    end

# File lib/zenweb/page.rb, line 440
def series_page
  series = self.config[:series]
  Zenweb::SeriesPage.all[series] if series
end

# File lib/zenweb/page.rb, line 370
def stale?
  file(url_path).needed?
end

# File lib/zenweb/page.rb, line 377
def stylesheet name
  link_head rel:"stylesheet", type:"text/css", href:"/css/#{name}.css"
end

# File lib/zenweb/page.rb, line 387
def subrender page = self, content = nil
  self.filetypes.inject(content) { |cont, type|
    send "render_#{type}", page, cont
  } || self.body
end

# File lib/zenweb/page.rb, line 436
def tag_pages
  (self.config[:tags] || []).map { |t| Zenweb::TagDetail.all[t] }.compact
end

# File lib/zenweb/page.rb, line 415
def url
  @url ||= self.path.
    sub(/^/, '/').
    sub(/(\d\d\d\d)-(\d\d)-(\d\d)-/) { |s| "#{format_date s}/" }.
    gsub(self.class.renderers_re, '')
end

# File lib/zenweb/page.rb, line 425
def url_dir
  File.dirname url_path
end

# File lib/zenweb/page.rb, line 432
def url_path
  @url_path ||= File.join(".site", self.url)
end

# File lib/zenweb/page.rb, line 460
def wire
  @wired ||= false # HACK
  return if @wired
  @wired = true

  file self.path

  conf = self.config
  conf = conf.parent if self.path == conf.path

  file self.path => conf.path if conf.path
  conf.wire

  if self.layout then
    file self.path => self.layout.path
    self.layout.wire
  end

  file url_path => all_subpages.flatten.map(&:url_path) if url =~ /index.html/

  unless url_dir =~ %r%/_% then
    directory url_dir
    file url_path => url_dir
    file url_path => path do
      self.generate
    end

    task :site => url_path
  end
end