require 'property_set'
require 'i18n'
require 'pathname'

class StaticPage

  class PageArray < Array
    def limit(num)
      PageArray.new(self[0..(num-1)])
    end
    def order_by(attr, options={})
      locale = options[:locale] || I18n.locale
      direction = options[:direction] || :asc
      array = sort do |a,b|
        if direction == :desc
          a, b = b, a
        end
        a_prop = a.props.locale(locale).send(attr)
        b_prop = b.props.locale(locale).send(attr)
        if a_prop.nil? && b_prop.nil?
          0
        elsif a_prop.nil?
          1
        elsif b_prop.nil?
          -1
        else
          a_prop <=> b_prop
        end
      end
      array.delete_if do |page|
        page.props.locale(locale).send(attr).nil?
      end
      return PageArray.new.replace array
    end
  end

  attr_accessor :path, :children, :name, :props, :parent

  def self.find(filter)
    if filter =~ /\//
      path = filter.split('/').map{|segment| segment.gsub(/[^0-9a-z_-]/, '')}
      page = @@pages[path.join('/')]
      if page
        return page
      else
        return @@pages[path.last]
      end
    else
      @@pages[filter]
    end
  end

  def self.all
    @@pages_array
  end

  def self.load(directory)
    @@pages = {}
    @@page_array = PageArray.new
    @@root_directory = directory
    @@relative_root_directory = relative_to_rails_view_root(directory)
    scan_directory(directory) do |page|
      @@pages[page.name] ||= page
      @@pages[page.path.join('/')] = page
      @@page_array << page
    end
  end

  def initialize(parent, name)
    @children = []
    @name = name
    if parent
      @parent = parent
      @parent.add_child(self)
      @path = [@parent.path, @name].flatten.compact
      @props = load_properties(file_path)
    else
      @path = []
    end
  end

  def add_child(page)
    @children << page
  end

  def all_children
    PageArray.new(child_tree.flatten.compact)
  end

  #
  # e.g. /home/user/dev/leap-public-site/app/views/pages/about-us/contact
  #
  def file_path
    "#{@@root_directory}/#{@path.join('/')}"
  end

  #
  # e.g. pages/about-us/contact/en
  #
  def template_path(locale=I18n.locale)
    "#{@@relative_root_directory}/#{@path.join('/')}/#{locale}"
  end

  def inspect
    "<'#{@path.join('/')}' #{children.inspect}>"
  end

  def title
    begin
      I18n.t!('pages.' + @name, :raise => true)
    rescue I18n::MissingTranslationData
      props.title
    end
  end

  protected

  def child_tree
    [self, children.collect{|child| child.child_tree}]
  end

  private

  def self.scan_directory(directory, parent=nil, &block)
    parent ||= StaticPage.new(nil, 'root')
    Dir.chdir directory do
      Dir.glob("*").each do |child_dir|
        next unless File.directory?(child_dir)
        page = StaticPage.new(parent, child_dir)
        yield page
        scan_directory(child_dir, page, &block)
      end
    end
  end

  def self.relative_to_rails_view_root(absolute_path)
    if Rails.root
      absolute = Pathname.new(absolute_path)
      rails_view_root = Pathname.new(Rails.root + 'app/views')
      absolute.relative_path_from(rails_view_root).to_s
    end
  end

  def load_properties(file_path)
    props = PropertySet.new(self)
    Dir.glob(file_path + '/*.haml') do |content_file_path|
      locale = File.basename(content_file_path).sub(File.extname(content_file_path),'')
      #variable_header = ""
      #p content_file_path
      #File.open(content_file_path) do |f|
      #  while (line = f.gets) =~ /^- @/
      #    variable_header << line
      #  end
      #end
      props.eval(locale, File.read(content_file_path))
    end
    return props
  end

end