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# Redmine - project management software

# Copyright (C) 2006-2012  Jean-Philippe Lang

#

# This program is free software; you can redistribute it and/or

# modify it under the terms of the GNU General Public License

# as published by the Free Software Foundation; either version 2

# of the License, or (at your option) any later version.

#

# This program is distributed in the hope that it will be useful,

# but WITHOUT ANY WARRANTY; without even the implied warranty of

# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

# GNU General Public License for more details.

#

# You should have received a copy of the GNU General Public License

# along with this program; if not, write to the Free Software

# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.

require 'digest/md5'

module Redmine

  module WikiFormatting

    class StaleSectionError < Exception; end

    @@formatters = {}

    class << self

      def map

        yield self

      end

      def register(name, formatter, helper)

        raise ArgumentError, "format name '#{name}' is already taken" if @@formatters[name.to_s]

        @@formatters[name.to_s] = {:formatter => formatter, :helper => helper}

      end

      def formatter

        formatter_for(Setting.text_formatting)

      end

      def formatter_for(name)

        entry = @@formatters[name.to_s]

        (entry && entry[:formatter]) || Redmine::WikiFormatting::NullFormatter::Formatter

      end

      def helper_for(name)

        entry = @@formatters[name.to_s]

        (entry && entry[:helper]) || Redmine::WikiFormatting::NullFormatter::Helper

      end

      def format_names

        @@formatters.keys.map

      end

      def to_html(format, text, options = {})

        text = if Setting.cache_formatted_text? && text.size > 2.kilobyte && cache_store && cache_key = cache_key_for(format, text, options[:object], options[:attribute])

          # Text retrieved from the cache store may be frozen

          # We need to dup it so we can do in-place substitutions with gsub!

          cache_store.fetch cache_key do

            formatter_for(format).new(text).to_html

          end.dup

        else

          formatter_for(format).new(text).to_html

        end

        text

      end

      # Returns true if the text formatter supports single section edit

      def supports_section_edit?

        (formatter.instance_methods & ['update_section', :update_section]).any?

      end

      # Returns a cache key for the given text +format+, +text+, +object+ and +attribute+ or nil if no caching should be done

      def cache_key_for(format, text, object, attribute)

        if object && attribute && !object.new_record? && format.present?

          "formatted_text/#{format}/#{object.class.model_name.cache_key}/#{object.id}-#{attribute}-#{Digest::MD5.hexdigest text}"

        end

      end

      # Returns the cache store used to cache HTML output

      def cache_store

        ActionController::Base.cache_store

      end

    end

    module LinksHelper

      AUTO_LINK_RE = %r{

                      (                          # leading text

                        <\w+.*?>|                # leading HTML tag, or

                        [^=<>!:'"/]|             # leading punctuation, or

                        ^                        # beginning of line

                      )

                      (

                        (?:https?://)|           # protocol spec, or

                        (?:s?ftps?://)|

                        (?:www\.)                # www.*

                      )

                      (

                        (\S+?)                   # url

                        (\/)?                    # slash

                      )

                      ((?:>)?|[^[:alnum:]_\=\/;\(\)]*?)               # post

                      (?=<|\s|$)

                     }x unless const_defined?(:AUTO_LINK_RE)

      # Destructively remplaces urls into clickable links

      def auto_link!(text)

        text.gsub!(AUTO_LINK_RE) do

          all, leading, proto, url, post = $&, $1, $2, $3, $6

          if leading =~ /<a\s/i || leading =~ /![<>=]?/

            # don't replace URL's that are already linked

            # and URL's prefixed with ! !> !< != (textile images)

            all

          else

            # Idea below : an URL with unbalanced parethesis and

            # ending by ')' is put into external parenthesis

            if ( url[-1]==?) and ((url.count("(") - url.count(")")) < 0 ) )

              url=url[0..-2] # discard closing parenth from url

              post = ")"+post # add closing parenth to post

            end

            content = proto + url

            href = "#{proto=="www."?"http://www.":proto}#{url}"

            %(#{leading}<a class="external" href="#{ERB::Util.html_escape href}">#{ERB::Util.html_escape content}</a>#{post}).html_safe

          end

        end

      end

      # Destructively remplaces email addresses into clickable links

      def auto_mailto!(text)

        text.gsub!(/([\w\.!#\$%\-+.]+@[A-Za-z0-9\-]+(\.[A-Za-z0-9\-]+)+)/) do

          mail = $1

          if text.match(/<a\b[^>]*>(.*)(#{Regexp.escape(mail)})(.*)<\/a>/)

            mail

          else

            %(<a class="email" href="mailto:#{ERB::Util.html_escape mail}">#{ERB::Util.html_escape mail}</a>).html_safe

          end

        end

      end      

    end

    # Default formatter module

    module NullFormatter

      class Formatter

        include ActionView::Helpers::TagHelper

        include ActionView::Helpers::TextHelper

        include ActionView::Helpers::UrlHelper

        include Redmine::WikiFormatting::LinksHelper

        def initialize(text)

          @text = text

        end

        def to_html(*args)

          t = CGI::escapeHTML(@text)

          auto_link!(t)

          auto_mailto!(t)

          simple_format(t, {}, :sanitize => false)

        end

      end

      module Helper

        def wikitoolbar_for(field_id)

        end

        def heads_for_wiki_formatter

        end

        def initial_page_content(page)

          page.pretty_title.to_s

        end

      end

    end

  end

end