#Encoding: UTF-8

require 'gollum-lib'
require 'grit'
require 'ruby-progressbar'

module Caramelize
  autoload :Wiki, 'caramelize/wiki/wiki'
  autoload :WikkaWiki, 'caramelize/wiki/wikkawiki'
  autoload :RedmineWiki, 'caramelize/wiki/redmine_wiki'
  autoload :GollumOutput, 'caramelize/gollum_output'
  autoload :Author, 'caramelize/author'
  autoload :Page, 'caramelize/page'
  
  # Controller for the content migration
  class ContentTransferer
    
    # Execute the content migration
    def self.execute(original_wiki, options={})
      options[:default_author] = "Caramelize" if !options[:default_author]

      # read page revisions from wiki
      # store page revisions
      original_wiki.read_authors
      @revisions = original_wiki.read_pages
      # initiate new wiki
      output_wiki = GollumOutput.new('wiki.git') # TODO make wiki_path an option
      
      # see if original wiki markup is among any gollum supported markups
      options[:markup] = output_wiki.supported_markup.index(original_wiki.markup) ? original_wiki.markup : :markdown

      # setup progressbar
      progress_revisions = ProgressBar.create(:title => "Revisions", :total => @revisions.count, :format => '%a %B %p%% %t')

      # TODO ask if we should replace existing paths

      # commit page revisions to new wiki
      output_wiki.commit_history(@revisions, options) do |page, index|
        if options[:verbosity] == :verbose
          puts "(#{index+1}/#{@revisions.count}) #{page.time} #{page.title}"
        else
          progress_revisions.increment
        end
      end


      # TODO reorder interwiki links: https://github.com/gollum/gollum/wiki#bracket-tags

      # init list of filters to perform on the latest wiki pages
      filters = []

      original_wiki.filters.each do |filter|
        filters << filter
      end

      # if wiki needs to convert syntax, do so
      puts "From markup: " + original_wiki.markup.to_s if options[:verbosity] == :verbose
      puts "To markup: " + options[:markup].to_s if options[:verbosity] == :verbose
      if original_wiki.convert_markup? options[:markup] # is wiki in target markup


      end # end convert_markup?

      puts "Latest revisions:" if options[:verbosity] == :verbose

      #setup progress for markup conversion
        progress_markup = ProgressBar.create(:title => "Markup filters", :total => original_wiki.latest_revisions.count, :format => '%a %B %p%% %t')

      # take each latest revision
      for rev in original_wiki.latest_revisions
        puts "Filter source: #{rev.title} #{rev.time}"  if options[:verbosity] == :verbose
        progress_markup.increment
        
        # run filters
        body_new = rev.body
        filters.each do |filter|
          body_new = filter.run body_new
        end

        unless body_new.eql? rev.body
          rev.body = body_new
          rev.author_name = options[:markup]
          rev.time = Time.now
          rev.author = nil
          
          # commit as latest page revision
          output_wiki.commit_revision rev, options[:markup]
        end
      end
      

      if options[:create_namespace_home]
        output_wiki.create_namespace_home(original_wiki.namespaces)
      end
    end # end execute
  end
end