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# redMine - project management software

# Copyright (C) 2006-2007  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 'diff'

# The WikiController follows the Rails REST controller pattern but with

# a few differences

#

# * index - shows a list of WikiPages grouped by page or date

# * new - not used

# * create - not used

# * show - will also show the form for creating a new wiki page

# * edit - used to edit an existing or new page

# * update - used to save a wiki page update to the database, including new pages

# * destroy - normal

#

# Other member and collection methods are also used

#

# TODO: still being worked on

class WikiController < ApplicationController

  default_search_scope :wiki_pages

  before_filter :find_wiki, :authorize

  before_filter :find_existing_page, :only => [:rename, :protect, :history, :diff, :annotate, :add_attachment, :destroy]

  verify :method => :post, :only => [:protect], :redirect_to => { :action => :show }

  helper :attachments

  include AttachmentsHelper   

  helper :watchers

  # List of pages, sorted alphabetically and by parent (hierarchy)

  def index

    load_pages_grouped_by_date_without_content

  end

  # display a page (in editing mode if it doesn't exist)

  def show

    page_title = params[:id]

    @page = @wiki.find_or_new_page(page_title)

    if @page.new_record?

      if User.current.allowed_to?(:edit_wiki_pages, @project) && editable?

        edit

        render :action => 'edit'

      else

        render_404

      end

      return

    end

    if params[:version] && !User.current.allowed_to?(:view_wiki_edits, @project)

      # Redirects user to the current version if he's not allowed to view previous versions

      redirect_to :version => nil

      return

    end

    @content = @page.content_for_version(params[:version])

    if User.current.allowed_to?(:export_wiki_pages, @project)

      if params[:format] == 'html'

        export = render_to_string :action => 'export', :layout => false

        send_data(export, :type => 'text/html', :filename => "#{@page.title}.html")

        return

      elsif params[:format] == 'txt'

        send_data(@content.text, :type => 'text/plain', :filename => "#{@page.title}.txt")

        return

      end

    end

    @editable = editable?

    render :action => 'show'

  end

  # edit an existing page or a new one

  def edit

    @page = @wiki.find_or_new_page(params[:id])    

    return render_403 unless editable?

    @page.content = WikiContent.new(:page => @page) if @page.new_record?

    @content = @page.content_for_version(params[:version])

    @content.text = initial_page_content(@page) if @content.text.blank?

    # don't keep previous comment

    @content.comments = nil

    # To prevent StaleObjectError exception when reverting to a previous version

    @content.version = @page.content.version

  rescue ActiveRecord::StaleObjectError

    # Optimistic locking exception

    flash[:error] = l(:notice_locking_conflict)

  end

  verify :method => :put, :only => :update, :render => {:nothing => true, :status => :method_not_allowed }

  # Creates a new page or updates an existing one

  def update

    @page = @wiki.find_or_new_page(params[:id])    

    return render_403 unless editable?

    @page.content = WikiContent.new(:page => @page) if @page.new_record?

    @content = @page.content_for_version(params[:version])

    @content.text = initial_page_content(@page) if @content.text.blank?

    # don't keep previous comment

    @content.comments = nil

    if !@page.new_record? && params[:content].present? && @content.text == params[:content][:text]

      attachments = Attachment.attach_files(@page, params[:attachments])

      render_attachment_warning_if_needed(@page)

      # don't save if text wasn't changed

      redirect_to :action => 'show', :project_id => @project, :id => @page.title

      return

    end

    @content.attributes = params[:content]

    @content.author = User.current

    # if page is new @page.save will also save content, but not if page isn't a new record

    if (@page.new_record? ? @page.save : @content.save)

      attachments = Attachment.attach_files(@page, params[:attachments])

      render_attachment_warning_if_needed(@page)

      call_hook(:controller_wiki_edit_after_save, { :params => params, :page => @page})

      redirect_to :action => 'show', :project_id => @project, :id => @page.title

    end

  rescue ActiveRecord::StaleObjectError

    # Optimistic locking exception

    flash[:error] = l(:notice_locking_conflict)

  end

  # rename a page

  def rename

    return render_403 unless editable?

    @page.redirect_existing_links = true

    # used to display the *original* title if some AR validation errors occur

    @original_title = @page.pretty_title

    if request.post? && @page.update_attributes(params[:wiki_page])

      flash[:notice] = l(:notice_successful_update)

      redirect_to :action => 'show', :project_id => @project, :id => @page.title

    end

  end

  def protect

    @page.update_attribute :protected, params[:protected]

    redirect_to :action => 'show', :project_id => @project, :id => @page.title

  end

  # show page history

  def history

    @version_count = @page.content.versions.count

    @version_pages = Paginator.new self, @version_count, per_page_option, params['p']

    # don't load text    

    @versions = @page.content.versions.find :all, 

                                            :select => "id, author_id, comments, updated_on, version",

                                            :order => 'version DESC',

                                            :limit  =>  @version_pages.items_per_page + 1,

                                            :offset =>  @version_pages.current.offset

    render :layout => false if request.xhr?

  end

  def diff

    @diff = @page.diff(params[:version], params[:version_from])

    render_404 unless @diff

  end

  def annotate

    @annotate = @page.annotate(params[:version])

    render_404 unless @annotate

  end

  verify :method => :delete, :only => [:destroy], :redirect_to => { :action => :show }

  # Removes a wiki page and its history

  # Children can be either set as root pages, removed or reassigned to another parent page

  def destroy

    return render_403 unless editable?

    @descendants_count = @page.descendants.size

    if @descendants_count > 0

      case params[:todo]

      when 'nullify'

        # Nothing to do

      when 'destroy'

        # Removes all its descendants

        @page.descendants.each(&:destroy)

      when 'reassign'

        # Reassign children to another parent page

        reassign_to = @wiki.pages.find_by_id(params[:reassign_to_id].to_i)

        return unless reassign_to

        @page.children.each do |child|

          child.update_attribute(:parent, reassign_to)

        end

      else

        @reassignable_to = @wiki.pages - @page.self_and_descendants

        return

      end

    end

    @page.destroy

    redirect_to :action => 'index', :project_id => @project

  end

  # Export wiki to a single html file

  def export

    if User.current.allowed_to?(:export_wiki_pages, @project)

      @pages = @wiki.pages.find :all, :order => 'title'

      export = render_to_string :action => 'export_multiple', :layout => false

      send_data(export, :type => 'text/html', :filename => "wiki.html")

    else

      redirect_to :action => 'show', :project_id => @project, :id => nil

    end

  end

  def date_index

    load_pages_grouped_by_date_without_content

  end

  def preview

    page = @wiki.find_page(params[:id])

    # page is nil when previewing a new page

    return render_403 unless page.nil? || editable?(page)

    if page

      @attachements = page.attachments

      @previewed = page.content

    end

    @text = params[:content][:text]

    render :partial => 'common/preview'

  end

  def add_attachment

    return render_403 unless editable?

    attachments = Attachment.attach_files(@page, params[:attachments])

    render_attachment_warning_if_needed(@page)

    redirect_to :action => 'show', :id => @page.title, :project_id => @project

  end

private

  def find_wiki

    @project = Project.find(params[:project_id])

    @wiki = @project.wiki

    render_404 unless @wiki

  rescue ActiveRecord::RecordNotFound

    render_404

  end

  # Finds the requested page and returns a 404 error if it doesn't exist

  def find_existing_page

    @page = @wiki.find_page(params[:id])

    render_404 if @page.nil?

  end

  # Returns true if the current user is allowed to edit the page, otherwise false

  def editable?(page = @page)

    page.editable_by?(User.current)

  end

  # Returns the default content of a new wiki page

  def initial_page_content(page)

    helper = Redmine::WikiFormatting.helper_for(Setting.text_formatting)

    extend helper unless self.instance_of?(helper)

    helper.instance_method(:initial_page_content).bind(self).call(page)

  end

  # eager load information about last updates, without loading text

  def load_pages_grouped_by_date_without_content

    @pages = @wiki.pages.find :all, :select => "#{WikiPage.table_name}.*, #{WikiContent.table_name}.updated_on",

                                    :joins => "LEFT JOIN #{WikiContent.table_name} ON #{WikiContent.table_name}.page_id = #{WikiPage.table_name}.id",

                                    :order => 'title'

    @pages_by_date = @pages.group_by {|p| p.updated_on.to_date}

    @pages_by_parent_id = @pages.group_by(&:parent_id)

  end

end