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# Redmine - project management software

# Copyright (C) 2006-2013  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_or_new_page, :only => [:show, :edit, :update]

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

  accept_api_auth :index, :show, :update, :destroy

  before_filter :find_attachments, :only => [:preview]

  helper :attachments

  include AttachmentsHelper

  helper :watchers

  include Redmine::Export::PDF

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

  def index

    load_pages_for_index

    respond_to do |format|

      format.html {

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

      }

      format.api

    end

  end

  # List of page, by last update

  def date_index

    load_pages_for_index

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

  end

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

  def show

    if @page.new_record?

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

        edit

        render :action => 'edit'

      else

        render_404

      end

      return

    end

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

      deny_access

      return

    end

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

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

      if params[:format] == 'pdf'

        send_data(wiki_page_to_pdf(@page, @project), :type => 'application/pdf', :filename => "#{@page.title}.pdf")

        return

      elsif 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?

    @sections_editable = @editable && User.current.allowed_to?(:edit_wiki_pages, @page.project) &&

      @content.current_version? &&

      Redmine::WikiFormatting.supports_section_edit?

    respond_to do |format|

      format.html

      format.api

    end

  end

  # edit an existing page or a new one

  def edit

    return render_403 unless editable?

    if @page.new_record?

      @page.content = WikiContent.new(:page => @page)

      if params[:parent].present?

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

      end

    end

    @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

    @text = @content.text

    if params[:section].present? && Redmine::WikiFormatting.supports_section_edit?

      @section = params[:section].to_i

      @text, @section_hash = Redmine::WikiFormatting.formatter.new(@text).get_section(@section)

      render_404 if @text.blank?

    end

  end

  # Creates a new page or updates an existing one

  def update

    return render_403 unless editable?

    was_new_page = @page.new_record?

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

    @page.safe_attributes = params[:wiki_page]

    @content = @page.content

    content_params = params[:content]

    if content_params.nil? && params[:wiki_page].is_a?(Hash)

      content_params = params[:wiki_page].slice(:text, :comments, :version)

    end

    content_params ||= {}

    @content.comments = content_params[:comments]

    @text = content_params[:text]

    if params[:section].present? && Redmine::WikiFormatting.supports_section_edit?

      @section = params[:section].to_i

      @section_hash = params[:section_hash]

      @content.text = Redmine::WikiFormatting.formatter.new(@content.text).update_section(params[:section].to_i, @text, @section_hash)

    else

      @content.version = content_params[:version] if content_params[:version]

      @content.text = @text

    end

    @content.author = User.current

    if @page.save_with_content

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

      render_attachment_warning_if_needed(@page)

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

      respond_to do |format|

        format.html { redirect_to project_wiki_page_path(@project, @page.title) }

        format.api {

          if was_new_page

            render :action => 'show', :status => :created, :location => project_wiki_page_path(@project, @page.title)

          else

            render_api_ok

          end

        }

      end

    else

      respond_to do |format|

        format.html { render :action => 'edit' }

        format.api { render_validation_errors(@content) }

      end

    end

  rescue ActiveRecord::StaleObjectError, Redmine::WikiFormatting::StaleSectionError

    # Optimistic locking exception

    respond_to do |format|

      format.html {

        flash.now[:error] = l(:notice_locking_conflict)

        render :action => 'edit'

      }

      format.api { render_api_head :conflict }

    end

  rescue ActiveRecord::RecordNotSaved

    respond_to do |format|

      format.html { render :action => 'edit' }

      format.api { render_validation_errors(@content) }

    end

  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 project_wiki_page_path(@project, @page.title)

    end

  end

  def protect

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

    redirect_to project_wiki_page_path(@project, @page.title)

  end

  # show page history

  def history

    @version_count = @page.content.versions.count

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

    # don't load text

    @versions = @page.content.versions.

      select("id, author_id, comments, updated_on, version").

      reorder('version DESC').

      limit(@version_pages.per_page + 1).

      offset(@version_pages.offset).

      all

    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

  # 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

        # display the destroy form if it's a user request

        return unless api_request?

      end

    end

    @page.destroy

    respond_to do |format|

      format.html { redirect_to project_wiki_index_path(@project) }

      format.api { render_api_ok }

    end

  end

  def destroy_version

    return render_403 unless editable?

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

    @content.destroy

    redirect_to_referer_or history_project_wiki_page_path(@project, @page.title)

  end

  # Export wiki to a single pdf or html file

  def export

    @pages = @wiki.pages.all(:order => 'title', :include => [:content, {:attachments => :author}])

    respond_to do |format|

      format.html {

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

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

      }

      format.pdf {

        send_data(wiki_pages_to_pdf(@pages, @project), :type => 'application/pdf', :filename => "#{@project.identifier}.pdf")

      }

    end

  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

      @attachments += 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 or a new page if it doesn't exist

  def find_existing_or_new_page

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

    if @wiki.page_found_with_redirect?

      redirect_to params.update(:id => @page.title)

    end

  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])

    if @page.nil?

      render_404

      return

    end

    if @wiki.page_found_with_redirect?

      redirect_to params.update(:id => @page.title)

    end

  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

  def load_pages_for_index

    @pages = @wiki.pages.with_updated_on.reorder("#{WikiPage.table_name}.title").includes(:wiki => :project).includes(:parent).all

  end

end