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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.

require 'diff'

require 'enumerator'

class WikiPage < ActiveRecord::Base

  include Redmine::SafeAttributes

  belongs_to :wiki

  has_one :content, :class_name => 'WikiContent', :foreign_key => 'page_id', :dependent => :destroy

  acts_as_attachable :delete_permission => :delete_wiki_pages_attachments

  acts_as_tree :dependent => :nullify, :order => 'title'

  acts_as_watchable

  acts_as_event :title => Proc.new {|o| "#{l(:label_wiki)}: #{o.title}"},

                :description => :text,

                :datetime => :created_on,

                :url => Proc.new {|o| {:controller => 'wiki', :action => 'show', :project_id => o.wiki.project, :id => o.title}}

  acts_as_searchable :columns => ['title', "#{WikiContent.table_name}.text"],

                     :include => [{:wiki => :project}, :content],

                     :permission => :view_wiki_pages,

                     :project_key => "#{Wiki.table_name}.project_id"

  attr_accessor :redirect_existing_links

  validates_presence_of :title

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

  validates_uniqueness_of :title, :scope => :wiki_id, :case_sensitive => false

  validates_associated :content

  validate :validate_parent_title

  before_destroy :remove_redirects

  before_save    :handle_redirects

  # eager load information about last updates, without loading text

  scope :with_updated_on, lambda {

    select("#{WikiPage.table_name}.*, #{WikiContent.table_name}.updated_on, #{WikiContent.table_name}.version").

      joins("LEFT JOIN #{WikiContent.table_name} ON #{WikiContent.table_name}.page_id = #{WikiPage.table_name}.id")

  }

  # Wiki pages that are protected by default

  DEFAULT_PROTECTED_PAGES = %w(sidebar)

  safe_attributes 'parent_id', 'parent_title',

    :if => lambda {|page, user| page.new_record? || user.allowed_to?(:rename_wiki_pages, page.project)}

  def initialize(attributes=nil, *args)

    super

    if new_record? && DEFAULT_PROTECTED_PAGES.include?(title.to_s.downcase)

      self.protected = true

    end

  end

  def visible?(user=User.current)

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

  end

  def title=(value)

    value = Wiki.titleize(value)

    @previous_title = read_attribute(:title) if @previous_title.blank?

    write_attribute(:title, value)

  end

  def handle_redirects

    self.title = Wiki.titleize(title)

    # Manage redirects if the title has changed

    if !@previous_title.blank? && (@previous_title != title) && !new_record?

      # Update redirects that point to the old title

      wiki.redirects.where(:redirects_to => @previous_title).each do |r|

        r.redirects_to = title

        r.title == r.redirects_to ? r.destroy : r.save

      end

      # Remove redirects for the new title

      wiki.redirects.where(:title => title).each(&:destroy)

      # Create a redirect to the new title

      wiki.redirects << WikiRedirect.new(:title => @previous_title, :redirects_to => title) unless redirect_existing_links == "0"

      @previous_title = nil

    end

  end

  def remove_redirects

    # Remove redirects to this page

    wiki.redirects.where(:redirects_to => title).each(&:destroy)

  end

  def pretty_title

    WikiPage.pretty_title(title)

  end

  def content_for_version(version=nil)

    if content

      result = content.versions.find_by_version(version.to_i) if version

      result ||= content

      result

    end

  end

  def diff(version_to=nil, version_from=nil)

    version_to = version_to ? version_to.to_i : self.content.version

    content_to = content.versions.find_by_version(version_to)

    content_from = version_from ? content.versions.find_by_version(version_from.to_i) : content_to.try(:previous)

    return nil unless content_to && content_from

    if content_from.version > content_to.version

      content_to, content_from = content_from, content_to

    end

    (content_to && content_from) ? WikiDiff.new(content_to, content_from) : nil

  end

  def annotate(version=nil)

    version = version ? version.to_i : self.content.version

    c = content.versions.find_by_version(version)

    c ? WikiAnnotate.new(c) : nil

  end

  def self.pretty_title(str)

    (str && str.is_a?(String)) ? str.tr('_', ' ') : str

  end

  def project

    wiki.project

  end

  def text

    content.text if content

  end

  def updated_on

    unless @updated_on

      if time = read_attribute(:updated_on)

        # content updated_on was eager loaded with the page

        begin

          @updated_on = (self.class.default_timezone == :utc ? Time.parse(time.to_s).utc : Time.parse(time.to_s).localtime)

        rescue

        end

      else

        @updated_on = content && content.updated_on

      end

    end

    @updated_on

  end

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

  def editable_by?(usr)

    !protected? || usr.allowed_to?(:protect_wiki_pages, wiki.project)

  end

  def attachments_deletable?(usr=User.current)

    editable_by?(usr) && super(usr)

  end

  def parent_title

    @parent_title || (self.parent && self.parent.pretty_title)

  end

  def parent_title=(t)

    @parent_title = t

    parent_page = t.blank? ? nil : self.wiki.find_page(t)

    self.parent = parent_page

  end

  # Saves the page and its content if text was changed

  def save_with_content(content)

    ret = nil

    transaction do

      self.content = content

      if new_record?

        # Rails automatically saves associated content

        ret = save

      else

        ret = save && (content.text_changed? ? content.save : true)

      end

      raise ActiveRecord::Rollback unless ret

    end

    ret

  end

  protected

  def validate_parent_title

    errors.add(:parent_title, :invalid) if !@parent_title.blank? && parent.nil?

    errors.add(:parent_title, :circular_dependency) if parent && (parent == self || parent.ancestors.include?(self))

    errors.add(:parent_title, :not_same_project) if parent && (parent.wiki_id != wiki_id)

  end

end

class WikiDiff < Redmine::Helpers::Diff

  attr_reader :content_to, :content_from

  def initialize(content_to, content_from)

    @content_to = content_to

    @content_from = content_from

    super(content_to.text, content_from.text)

  end

end

class WikiAnnotate

  attr_reader :lines, :content

  def initialize(content)

    @content = content

    current = content

    current_lines = current.text.split(/\r?\n/)

    @lines = current_lines.collect {|t| [nil, nil, t]}

    positions = []

    current_lines.size.times {|i| positions << i}

    while (current.previous)

      d = current.previous.text.split(/\r?\n/).diff(current.text.split(/\r?\n/)).diffs.flatten

      d.each_slice(3) do |s|

        sign, line = s[0], s[1]

        if sign == '+' && positions[line] && positions[line] != -1

          if @lines[positions[line]][0].nil?

            @lines[positions[line]][0] = current.version

            @lines[positions[line]][1] = current.author

          end

        end

      end

      d.each_slice(3) do |s|

        sign, line = s[0], s[1]

        if sign == '-'

          positions.insert(line, -1)

        else

          positions[line] = nil

        end

      end

      positions.compact!

      # Stop if every line is annotated

      break unless @lines.detect { |line| line[0].nil? }

      current = current.previous

    end

    @lines.each { |line|

      line[0] ||= current.version

      # if the last known version is > 1 (eg. history was cleared), we don't know the author

      line[1] ||= current.author if current.version == 1

    }

  end

end