module Polyblock
  module ApplicationHelper

    def pb(name, options={})
      options = {
          :editable => false,
          :tag => :div,
          :tag_options => {},
          :condensed => false,
          :length => 250,
          :omission => '... (continued)'
      }.merge(options)

      # Fetch or create Polyblock
      if name.is_a? Polyblock::Block
        pb = name
        pb_id = pb.id
        name = pb.name
        pb_exists = true
      else
        matches = Polyblock::Block.where :name => name
        pb_exists = matches.any?
        pb = pb_exists ? matches.first : Polyblock::Block.new({:name => name})
        pb_id = if pb_exists
          pb.id
        else
          Polyblock::Block.any? ? Polyblock::Block.order(:id).last.id + 1 : 1
        end
      end

      # Generate a random string for id
      o = [('a'..'z'), ('A'..'Z')].map { |i| i.to_a }.flatten
      random_id = (0...50).map { o[rand(o.length)] }.join

      # Build output tag
      content = pb_exists ? pb.content : "<p>This block is content managed by Polyblock!<br />Click to edit me!</p>"
      tag_options = options[:tag_options].deep_merge({:id => "pb-#{pb_id}-#{random_id}", :data => {:pbid => pb_id, :pbname => name}})
      tag_options[:contenteditable] = if options[:condensed]
                                        "false"
                                      elsif options[:editable]
                                        "true"
                                      elsif respond_to?(:can?) && can?(:manage, pb)
                                        "true"
                                      elsif respond_to?(:user_signed_in?) && user_signed_in?
                                        if current_user.respond_to?(:admin?) && current_user.admin?
                                          "true"
                                        elsif pb.contentable.present? &&
                                            pb.contentable.respond_to?(:user_id) &&
                                            pb.contentable.user_id == current_user.id
                                          "true"
                                        else
                                          "false"
                                        end
                                      else
                                        "false"
                                      end
      tag_options[:class] = (tag_options.has_key?(:class) ? "#{tag_options[:class]} ":"") + "polyblock"
      tag_options[:data][:pb_exists] = pb_exists

      # Truncation
      if options[:condensed]
        tag_options[:class] += " polyblock-condensed"
        content = CGI.unescapeHTML(content.gsub("<br><br>", "<br>").gsub('&nbsp;', ' '))
        content = truncate(sanitize(strip_tags(content)), :length => options[:length], :omission => options[:omission]).html_safe
      end

      content_tag(options[:tag], content, tag_options, false)
    end

    def simple_fields_for_polyblock(name, f, options={})
      options = {
          :label => false,
          :input_html => {}
      }.merge(options)
      render :partial => "polyblock/simple_fields_for", :locals => {:f => f, :name => name, :options => options}
    end

    def polyblock_editor_bar
      render :partial => "polyblock/editor_bar"
    end

  end
end