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# Redmine - project management software

# Copyright (C) 2006-2014  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.

class Wiki < ActiveRecord::Base

  include Redmine::SafeAttributes

  belongs_to :project

  has_many :pages, :class_name => 'WikiPage', :dependent => :destroy, :order => 'title'

  has_many :redirects, :class_name => 'WikiRedirect', :dependent => :delete_all

  acts_as_watchable

  validates_presence_of :start_page

  validates_format_of :start_page, :with => /\A[^,\.\/\?\;\|\:]*\z/

  safe_attributes 'start_page'

  def visible?(user=User.current)

    !user.nil? && user.allowed_to?(:view_wiki_pages, project)

  end

  # Returns the wiki page that acts as the sidebar content

  # or nil if no such page exists

  def sidebar

    @sidebar ||= find_page('Sidebar', :with_redirect => false)

  end

  # find the page with the given title

  # if page doesn't exist, return a new page

  def find_or_new_page(title)

    title = start_page if title.blank?

    find_page(title) || WikiPage.new(:wiki => self, :title => Wiki.titleize(title))

  end

  # find the page with the given title

  def find_page(title, options = {})

    @page_found_with_redirect = false

    title = start_page if title.blank?

    title = Wiki.titleize(title)

    page = pages.where("LOWER(title) = LOWER(?)", title).first

    if !page && !(options[:with_redirect] == false)

      # search for a redirect

      redirect = redirects.where("LOWER(title) = LOWER(?)", title).first

      if redirect

        page = find_page(redirect.redirects_to, :with_redirect => false)

        @page_found_with_redirect = true

      end

    end

    page

  end

  # Returns true if the last page was found with a redirect

  def page_found_with_redirect?

    @page_found_with_redirect

  end

  # Finds a page by title

  # The given string can be of one of the forms: "title" or "project:title"

  # Examples:

  #   Wiki.find_page("bar", project => foo)

  #   Wiki.find_page("foo:bar")

  def self.find_page(title, options = {})

    project = options[:project]

    if title.to_s =~ %r{^([^\:]+)\:(.*)$}

      project_identifier, title = $1, $2

      project = Project.find_by_identifier(project_identifier) || Project.find_by_name(project_identifier)

    end

    if project && project.wiki

      page = project.wiki.find_page(title)

      if page && page.content

        page

      end

    end

  end

  # turn a string into a valid page title

  def self.titleize(title)

    # replace spaces with _ and remove unwanted caracters

    title = title.gsub(/\s+/, '_').delete(',./?;|:') if title

    # upcase the first letter

    title = (title.slice(0..0).upcase + (title.slice(1..-1) || '')) if title

    title

  end

end