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# Redmine - project management software

# Copyright (C) 2006-2011  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 Issue < ActiveRecord::Base

  include Redmine::SafeAttributes

  belongs_to :project

  belongs_to :tracker

  belongs_to :status, :class_name => 'IssueStatus', :foreign_key => 'status_id'

  belongs_to :author, :class_name => 'User', :foreign_key => 'author_id'

  belongs_to :assigned_to, :class_name => 'User', :foreign_key => 'assigned_to_id'

  belongs_to :fixed_version, :class_name => 'Version', :foreign_key => 'fixed_version_id'

  belongs_to :priority, :class_name => 'IssuePriority', :foreign_key => 'priority_id'

  belongs_to :category, :class_name => 'IssueCategory', :foreign_key => 'category_id'

  has_many :journals, :as => :journalized, :dependent => :destroy

  has_many :time_entries, :dependent => :delete_all

  has_and_belongs_to_many :changesets, :order => "#{Changeset.table_name}.committed_on ASC, #{Changeset.table_name}.id ASC"

  has_many :relations_from, :class_name => 'IssueRelation', :foreign_key => 'issue_from_id', :dependent => :delete_all

  has_many :relations_to, :class_name => 'IssueRelation', :foreign_key => 'issue_to_id', :dependent => :delete_all

  acts_as_nested_set :scope => 'root_id', :dependent => :destroy

  acts_as_attachable :after_remove => :attachment_removed

  acts_as_customizable

  acts_as_watchable

  acts_as_searchable :columns => ['subject', "#{table_name}.description", "#{Journal.table_name}.notes"],

                     :include => [:project, :journals],

                     # sort by id so that limited eager loading doesn't break with postgresql

                     :order_column => "#{table_name}.id"

  acts_as_event :title => Proc.new {|o| "#{o.tracker.name} ##{o.id} (#{o.status}): #{o.subject}"},

                :url => Proc.new {|o| {:controller => 'issues', :action => 'show', :id => o.id}},

                :type => Proc.new {|o| 'issue' + (o.closed? ? ' closed' : '') }

  acts_as_activity_provider :find_options => {:include => [:project, :author, :tracker]},

                            :author_key => :author_id

  DONE_RATIO_OPTIONS = %w(issue_field issue_status)

  attr_reader :current_journal

  validates_presence_of :subject, :priority, :project, :tracker, :author, :status

  validates_length_of :subject, :maximum => 255

  validates_inclusion_of :done_ratio, :in => 0..100

  validates_numericality_of :estimated_hours, :allow_nil => true

  named_scope :visible, lambda {|*args| { :include => :project,

                                          :conditions => Issue.visible_condition(args.shift || User.current, *args) } }

  named_scope :open, :conditions => ["#{IssueStatus.table_name}.is_closed = ?", false], :include => :status

  named_scope :recently_updated, :order => "#{Issue.table_name}.updated_on DESC"

  named_scope :with_limit, lambda { |limit| { :limit => limit} }

  named_scope :on_active_project, :include => [:status, :project, :tracker],

                                  :conditions => ["#{Project.table_name}.status=#{Project::STATUS_ACTIVE}"]

  named_scope :without_version, lambda {

    {

      :conditions => { :fixed_version_id => nil}

    }

  }

  named_scope :with_query, lambda {|query|

    {

      :conditions => Query.merge_conditions(query.statement)

    }

  }

  before_create :default_assign

  before_save :close_duplicates, :update_done_ratio_from_issue_status

  after_save :reschedule_following_issues, :update_nested_set_attributes, :update_parent_attributes, :create_journal

  after_destroy :update_parent_attributes

  # Returns a SQL conditions string used to find all issues visible by the specified user

  def self.visible_condition(user, options={})

    Project.allowed_to_condition(user, :view_issues, options) do |role, user|

      case role.issues_visibility

      when 'all'

        nil

      when 'default'

        "(#{table_name}.is_private = #{connection.quoted_false} OR #{table_name}.author_id = #{user.id} OR #{table_name}.assigned_to_id = #{user.id})"

      when 'own'

        "(#{table_name}.author_id = #{user.id} OR #{table_name}.assigned_to_id = #{user.id})"

      else

        '1=0'

      end

    end

  end

  # Returns true if usr or current user is allowed to view the issue

  def visible?(usr=nil)

    (usr || User.current).allowed_to?(:view_issues, self.project) do |role, user|

      case role.issues_visibility

      when 'all'

        true

      when 'default'

        !self.is_private? || self.author == user || self.assigned_to == user

      when 'own'

        self.author == user || self.assigned_to == user

      else

        false

      end

    end

  end

  def after_initialize

    if new_record?

      # set default values for new records only

      self.status ||= IssueStatus.default

      self.priority ||= IssuePriority.default

    end

  end

  # Overrides Redmine::Acts::Customizable::InstanceMethods#available_custom_fields

  def available_custom_fields

    (project && tracker) ? (project.all_issue_custom_fields & tracker.custom_fields.all) : []

  end

  def copy_from(arg)

    issue = arg.is_a?(Issue) ? arg : Issue.visible.find(arg)

    self.attributes = issue.attributes.dup.except("id", "root_id", "parent_id", "lft", "rgt", "created_on", "updated_on")

    self.custom_field_values = issue.custom_field_values.inject({}) {|h,v| h[v.custom_field_id] = v.value; h}

    self.status = issue.status

    self

  end

  # Moves/copies an issue to a new project and tracker

  # Returns the moved/copied issue on success, false on failure

  def move_to_project(*args)

    ret = Issue.transaction do

      move_to_project_without_transaction(*args) || raise(ActiveRecord::Rollback)

    end || false

  end

  def move_to_project_without_transaction(new_project, new_tracker = nil, options = {})

    options ||= {}

    issue = options[:copy] ? self.class.new.copy_from(self) : self

    if new_project && issue.project_id != new_project.id

      # delete issue relations

      unless Setting.cross_project_issue_relations?

        issue.relations_from.clear

        issue.relations_to.clear

      end

      # issue is moved to another project

      # reassign to the category with same name if any

      new_category = issue.category.nil? ? nil : new_project.issue_categories.find_by_name(issue.category.name)

      issue.category = new_category

      # Keep the fixed_version if it's still valid in the new_project

      unless new_project.shared_versions.include?(issue.fixed_version)

        issue.fixed_version = nil

      end

      issue.project = new_project

      if issue.parent && issue.parent.project_id != issue.project_id

        issue.parent_issue_id = nil

      end

    end

    if new_tracker

      issue.tracker = new_tracker

      issue.reset_custom_values!

    end

    if options[:copy]

      issue.author = User.current

      issue.custom_field_values = self.custom_field_values.inject({}) {|h,v| h[v.custom_field_id] = v.value; h}

      issue.status = if options[:attributes] && options[:attributes][:status_id]

                       IssueStatus.find_by_id(options[:attributes][:status_id])

                     else

                       self.status

                     end

    end

    # Allow bulk setting of attributes on the issue

    if options[:attributes]

      issue.attributes = options[:attributes]

    end

    if issue.save

      if options[:copy]

        if current_journal && current_journal.notes.present?

          issue.init_journal(current_journal.user, current_journal.notes)

          issue.current_journal.notify = false

          issue.save

        end

      else

        # Manually update project_id on related time entries

        TimeEntry.update_all("project_id = #{new_project.id}", {:issue_id => id})

        issue.children.each do |child|

          unless child.move_to_project_without_transaction(new_project)

            # Move failed and transaction was rollback'd

            return false

          end

        end

      end

    else

      return false

    end

    issue

  end

  def status_id=(sid)

    self.status = nil

    write_attribute(:status_id, sid)

  end

  def priority_id=(pid)

    self.priority = nil

    write_attribute(:priority_id, pid)

  end

  def tracker_id=(tid)

    self.tracker = nil

    result = write_attribute(:tracker_id, tid)

    @custom_field_values = nil

    result

  end

  def description=(arg)

    if arg.is_a?(String)

      arg = arg.gsub(/(\r\n|\n|\r)/, "\r\n")

    end

    write_attribute(:description, arg)

  end

  # Overrides attributes= so that tracker_id gets assigned first

  def attributes_with_tracker_first=(new_attributes, *args)

    return if new_attributes.nil?

    new_tracker_id = new_attributes['tracker_id'] || new_attributes[:tracker_id]

    if new_tracker_id

      self.tracker_id = new_tracker_id

    end

    send :attributes_without_tracker_first=, new_attributes, *args

  end

  # Do not redefine alias chain on reload (see #4838)

  alias_method_chain(:attributes=, :tracker_first) unless method_defined?(:attributes_without_tracker_first=)

  def estimated_hours=(h)

    write_attribute :estimated_hours, (h.is_a?(String) ? h.to_hours : h)

  end

  safe_attributes 'tracker_id',

    'status_id',

    'parent_issue_id',

    'category_id',

    'assigned_to_id',

    'priority_id',

    'fixed_version_id',

    'subject',

    'description',

    'start_date',

    'due_date',

    'done_ratio',

    'estimated_hours',

    'custom_field_values',

    'custom_fields',

    'lock_version',

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

  safe_attributes 'status_id',

    'assigned_to_id',

    'fixed_version_id',

    'done_ratio',

    :if => lambda {|issue, user| issue.new_statuses_allowed_to(user).any? }

  safe_attributes 'is_private',

    :if => lambda {|issue, user|

      user.allowed_to?(:set_issues_private, issue.project) ||

        (issue.author == user && user.allowed_to?(:set_own_issues_private, issue.project))

    }

  # Safely sets attributes

  # Should be called from controllers instead of #attributes=

  # attr_accessible is too rough because we still want things like

  # Issue.new(:project => foo) to work

  # TODO: move workflow/permission checks from controllers to here

  def safe_attributes=(attrs, user=User.current)

    return unless attrs.is_a?(Hash)

    # User can change issue attributes only if he has :edit permission or if a workflow transition is allowed

    attrs = delete_unsafe_attributes(attrs, user)

    return if attrs.empty?

    # Tracker must be set before since new_statuses_allowed_to depends on it.

    if t = attrs.delete('tracker_id')

      self.tracker_id = t

    end

    if attrs['status_id']

      unless new_statuses_allowed_to(user).collect(&:id).include?(attrs['status_id'].to_i)

        attrs.delete('status_id')

      end

    end

    unless leaf?

      attrs.reject! {|k,v| %w(priority_id done_ratio start_date due_date estimated_hours).include?(k)}

    end

    if attrs.has_key?('parent_issue_id')

      if !user.allowed_to?(:manage_subtasks, project)

        attrs.delete('parent_issue_id')

      elsif !attrs['parent_issue_id'].blank?

        attrs.delete('parent_issue_id') unless Issue.visible(user).exists?(attrs['parent_issue_id'].to_i)

      end

    end

    self.attributes = attrs

  end

  def done_ratio

    if Issue.use_status_for_done_ratio? && status && status.default_done_ratio

      status.default_done_ratio

    else

      read_attribute(:done_ratio)

    end

  end

  def self.use_status_for_done_ratio?

    Setting.issue_done_ratio == 'issue_status'

  end

  def self.use_field_for_done_ratio?

    Setting.issue_done_ratio == 'issue_field'

  end

  def validate

    if self.due_date.nil? && @attributes['due_date'] && !@attributes['due_date'].empty?

      errors.add :due_date, :not_a_date

    end

    if self.due_date and self.start_date and self.due_date < self.start_date

      errors.add :due_date, :greater_than_start_date

    end

    if start_date && soonest_start && start_date < soonest_start

      errors.add :start_date, :invalid

    end

    if fixed_version

      if !assignable_versions.include?(fixed_version)

        errors.add :fixed_version_id, :inclusion

      elsif reopened? && fixed_version.closed?

        errors.add_to_base I18n.t(:error_can_not_reopen_issue_on_closed_version)

      end

    end

    # Checks that the issue can not be added/moved to a disabled tracker

    if project && (tracker_id_changed? || project_id_changed?)

      unless project.trackers.include?(tracker)

        errors.add :tracker_id, :inclusion

      end

    end

    # Checks parent issue assignment

    if @parent_issue

      if @parent_issue.project_id != project_id

        errors.add :parent_issue_id, :not_same_project

      elsif !new_record?

        # moving an existing issue

        if @parent_issue.root_id != root_id

          # we can always move to another tree

        elsif move_possible?(@parent_issue)

          # move accepted inside tree

        else

          errors.add :parent_issue_id, :not_a_valid_parent

        end

      end

    end

  end

  # Set the done_ratio using the status if that setting is set.  This will keep the done_ratios

  # even if the user turns off the setting later

  def update_done_ratio_from_issue_status

    if Issue.use_status_for_done_ratio? && status && status.default_done_ratio

      self.done_ratio = status.default_done_ratio

    end

  end

  def init_journal(user, notes = "")

    @current_journal ||= Journal.new(:journalized => self, :user => user, :notes => notes)

    @issue_before_change = self.clone

    @issue_before_change.status = self.status

    @custom_values_before_change = {}

    self.custom_values.each {|c| @custom_values_before_change.store c.custom_field_id, c.value }

    # Make sure updated_on is updated when adding a note.

    updated_on_will_change!

    @current_journal

  end

  # Return true if the issue is closed, otherwise false

  def closed?

    self.status.is_closed?

  end

  # Return true if the issue is being reopened

  def reopened?

    if !new_record? && status_id_changed?

      status_was = IssueStatus.find_by_id(status_id_was)

      status_new = IssueStatus.find_by_id(status_id)

      if status_was && status_new && status_was.is_closed? && !status_new.is_closed?

        return true

      end

    end

    false

  end

  # Return true if the issue is being closed

  def closing?

    if !new_record? && status_id_changed?

      status_was = IssueStatus.find_by_id(status_id_was)

      status_new = IssueStatus.find_by_id(status_id)

      if status_was && status_new && !status_was.is_closed? && status_new.is_closed?

        return true

      end

    end

    false

  end

  # Returns true if the issue is overdue

  def overdue?

    !due_date.nil? && (due_date < Date.today) && !status.is_closed?

  end

  # Is the amount of work done less than it should for the due date

  def behind_schedule?

    return false if start_date.nil? || due_date.nil?

    done_date = start_date + ((due_date - start_date+1)* done_ratio/100).floor

    return done_date <= Date.today

  end

  # Does this issue have children?

  def children?

    !leaf?

  end

  # Users the issue can be assigned to

  def assignable_users

    users = project.assignable_users

    users << author if author

    users.uniq.sort

  end

  # Versions that the issue can be assigned to

  def assignable_versions

    @assignable_versions ||= (project.shared_versions.open + [Version.find_by_id(fixed_version_id_was)]).compact.uniq.sort

  end

  # Returns true if this issue is blocked by another issue that is still open

  def blocked?

    !relations_to.detect {|ir| ir.relation_type == 'blocks' && !ir.issue_from.closed?}.nil?

  end

  # Returns an array of status that user is able to apply

  def new_statuses_allowed_to(user, include_default=false)

    statuses = status.find_new_statuses_allowed_to(

      user.roles_for_project(project),

      tracker,

      author == user,

      assigned_to_id_changed? ? assigned_to_id_was == user.id : assigned_to_id == user.id

      )

    statuses << status unless statuses.empty?

    statuses << IssueStatus.default if include_default

    statuses = statuses.uniq.sort

    blocked? ? statuses.reject {|s| s.is_closed?} : statuses

  end

  # Returns the mail adresses of users that should be notified

  def recipients

    notified = project.notified_users

    # Author and assignee are always notified unless they have been

    # locked or don't want to be notified

    notified << author if author && author.active? && author.notify_about?(self)

    notified << assigned_to if assigned_to && assigned_to.active? && assigned_to.notify_about?(self)

    notified.uniq!

    # Remove users that can not view the issue

    notified.reject! {|user| !visible?(user)}

    notified.collect(&:mail)

  end

  # Returns the total number of hours spent on this issue and its descendants

  #

  # Example:

  #   spent_hours => 0.0

  #   spent_hours => 50.2

  def spent_hours

    @spent_hours ||= self_and_descendants.sum("#{TimeEntry.table_name}.hours", :include => :time_entries).to_f || 0.0

  end

  def relations

    (relations_from + relations_to).sort

  end

  def all_dependent_issues(except=[])

    except << self

    dependencies = []

    relations_from.each do |relation|

      if relation.issue_to && !except.include?(relation.issue_to)

        dependencies << relation.issue_to

        dependencies += relation.issue_to.all_dependent_issues(except)

      end

    end

    dependencies

  end

  # Returns an array of issues that duplicate this one

  def duplicates

    relations_to.select {|r| r.relation_type == IssueRelation::TYPE_DUPLICATES}.collect {|r| r.issue_from}

  end

  # Returns the due date or the target due date if any

  # Used on gantt chart

  def due_before

    due_date || (fixed_version ? fixed_version.effective_date : nil)

  end

  # Returns the time scheduled for this issue.

  #

  # Example:

  #   Start Date: 2/26/09, End Date: 3/04/09

  #   duration => 6

  def duration

    (start_date && due_date) ? due_date - start_date : 0

  end

  def soonest_start

    @soonest_start ||= (

        relations_to.collect{|relation| relation.successor_soonest_start} +

        ancestors.collect(&:soonest_start)

      ).compact.max

  end

  def reschedule_after(date)

    return if date.nil?

    if leaf?

      if start_date.nil? || start_date < date

        self.start_date, self.due_date = date, date + duration

        save

      end

    else

      leaves.each do |leaf|

        leaf.reschedule_after(date)

      end

    end

  end

  def <=>(issue)

    if issue.nil?

      -1

    elsif root_id != issue.root_id

      (root_id || 0) <=> (issue.root_id || 0)

    else

      (lft || 0) <=> (issue.lft || 0)

    end

  end

  def to_s

    "#{tracker} ##{id}: #{subject}"

  end

  # Returns a string of css classes that apply to the issue

  def css_classes

    s = "issue status-#{status.position} "

    s << "priority-#{priority.position}"

    s << ' closed' if closed?

    s << ' overdue' if overdue?

    s << ' child' if child?

    s << ' parent' unless leaf?

    s << ' private' if is_private?

    s << ' created-by-me' if User.current.logged? && author_id == User.current.id

    s << ' assigned-to-me' if User.current.logged? && assigned_to_id == User.current.id

    s

  end

  # Saves an issue, time_entry, attachments, and a journal from the parameters

  # Returns false if save fails

  def save_issue_with_child_records(params, existing_time_entry=nil)

    Issue.transaction do

      if params[:time_entry] && (params[:time_entry][:hours].present? || params[:time_entry][:comments].present?) && User.current.allowed_to?(:log_time, project)

        @time_entry = existing_time_entry || TimeEntry.new

        @time_entry.project = project

        @time_entry.issue = self

        @time_entry.user = User.current

        @time_entry.spent_on = Date.today

        @time_entry.attributes = params[:time_entry]

        self.time_entries << @time_entry

      end

      if valid?

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

        attachments[:files].each {|a| @current_journal.details << JournalDetail.new(:property => 'attachment', :prop_key => a.id, :value => a.filename)}

        # TODO: Rename hook

        Redmine::Hook.call_hook(:controller_issues_edit_before_save, { :params => params, :issue => self, :time_entry => @time_entry, :journal => @current_journal})

        begin

          if save

            # TODO: Rename hook

            Redmine::Hook.call_hook(:controller_issues_edit_after_save, { :params => params, :issue => self, :time_entry => @time_entry, :journal => @current_journal})

          else

            raise ActiveRecord::Rollback

          end

        rescue ActiveRecord::StaleObjectError

          attachments[:files].each(&:destroy)

          errors.add_to_base l(:notice_locking_conflict)

          raise ActiveRecord::Rollback

        end

      end

    end

  end

  # Unassigns issues from +version+ if it's no longer shared with issue's project

  def self.update_versions_from_sharing_change(version)

    # Update issues assigned to the version

    update_versions(["#{Issue.table_name}.fixed_version_id = ?", version.id])

  end

  # Unassigns issues from versions that are no longer shared

  # after +project+ was moved

  def self.update_versions_from_hierarchy_change(project)

    moved_project_ids = project.self_and_descendants.reload.collect(&:id)

    # Update issues of the moved projects and issues assigned to a version of a moved project

    Issue.update_versions(["#{Version.table_name}.project_id IN (?) OR #{Issue.table_name}.project_id IN (?)", moved_project_ids, moved_project_ids])

  end

  def parent_issue_id=(arg)

    parent_issue_id = arg.blank? ? nil : arg.to_i

    if parent_issue_id && @parent_issue = Issue.find_by_id(parent_issue_id)

      @parent_issue.id

    else

      @parent_issue = nil

      nil

    end

  end

  def parent_issue_id

    if instance_variable_defined? :@parent_issue

      @parent_issue.nil? ? nil : @parent_issue.id

    else

      parent_id

    end

  end

  # Extracted from the ReportsController.

  def self.by_tracker(project)

    count_and_group_by(:project => project,

                       :field => 'tracker_id',

                       :joins => Tracker.table_name)

  end

  def self.by_version(project)

    count_and_group_by(:project => project,

                       :field => 'fixed_version_id',

                       :joins => Version.table_name)

  end

  def self.by_priority(project)

    count_and_group_by(:project => project,

                       :field => 'priority_id',

                       :joins => IssuePriority.table_name)

  end

  def self.by_category(project)

    count_and_group_by(:project => project,

                       :field => 'category_id',

                       :joins => IssueCategory.table_name)

  end

  def self.by_assigned_to(project)

    count_and_group_by(:project => project,

                       :field => 'assigned_to_id',

                       :joins => User.table_name)

  end

  def self.by_author(project)

    count_and_group_by(:project => project,

                       :field => 'author_id',

                       :joins => User.table_name)

  end

  def self.by_subproject(project)

    ActiveRecord::Base.connection.select_all("select    s.id as status_id, 

                                                s.is_closed as closed, 

                                                #{Issue.table_name}.project_id as project_id,

                                                count(#{Issue.table_name}.id) as total 

                                              from 

                                                #{Issue.table_name}, #{Project.table_name}, #{IssueStatus.table_name} s

                                              where 

                                                #{Issue.table_name}.status_id=s.id

                                                and #{Issue.table_name}.project_id = #{Project.table_name}.id

                                                and #{visible_condition(User.current, :project => project, :with_subprojects => true)}

                                                and #{Issue.table_name}.project_id <> #{project.id}

                                              group by s.id, s.is_closed, #{Issue.table_name}.project_id") if project.descendants.active.any?

  end

  # End ReportsController extraction

  # Returns an array of projects that current user can move issues to

  def self.allowed_target_projects_on_move

    projects = []

    if User.current.admin?

      # admin is allowed to move issues to any active (visible) project

      projects = Project.visible.all

    elsif User.current.logged?

      if Role.non_member.allowed_to?(:move_issues)

        projects = Project.visible.all

      else

        User.current.memberships.each {|m| projects << m.project if m.roles.detect {|r| r.allowed_to?(:move_issues)}}

      end

    end

    projects

  end

  private

  def update_nested_set_attributes

    if root_id.nil?

      # issue was just created

      self.root_id = (@parent_issue.nil? ? id : @parent_issue.root_id)

      set_default_left_and_right

      Issue.update_all("root_id = #{root_id}, lft = #{lft}, rgt = #{rgt}", ["id = ?", id])

      if @parent_issue

        move_to_child_of(@parent_issue)

      end

      reload

    elsif parent_issue_id != parent_id

      former_parent_id = parent_id

      # moving an existing issue

      if @parent_issue && @parent_issue.root_id == root_id

        # inside the same tree

        move_to_child_of(@parent_issue)

      else

        # to another tree

        unless root?

          move_to_right_of(root)

          reload

        end

        old_root_id = root_id

        self.root_id = (@parent_issue.nil? ? id : @parent_issue.root_id )

        target_maxright = nested_set_scope.maximum(right_column_name) || 0

        offset = target_maxright + 1 - lft

        Issue.update_all("root_id = #{root_id}, lft = lft + #{offset}, rgt = rgt + #{offset}",

                          ["root_id = ? AND lft >= ? AND rgt <= ? ", old_root_id, lft, rgt])

        self[left_column_name] = lft + offset

        self[right_column_name] = rgt + offset

        if @parent_issue

          move_to_child_of(@parent_issue)

        end

      end

      reload

      # delete invalid relations of all descendants

      self_and_descendants.each do |issue|

        issue.relations.each do |relation|

          relation.destroy unless relation.valid?

        end

      end

      # update former parent

      recalculate_attributes_for(former_parent_id) if former_parent_id

    end

    remove_instance_variable(:@parent_issue) if instance_variable_defined?(:@parent_issue)

  end

  def update_parent_attributes

    recalculate_attributes_for(parent_id) if parent_id

  end

  def recalculate_attributes_for(issue_id)

    if issue_id && p = Issue.find_by_id(issue_id)

      # priority = highest priority of children

      if priority_position = p.children.maximum("#{IssuePriority.table_name}.position", :include => :priority)

        p.priority = IssuePriority.find_by_position(priority_position)

      end

      # start/due dates = lowest/highest dates of children

      p.start_date = p.children.minimum(:start_date)

      p.due_date = p.children.maximum(:due_date)

      if p.start_date && p.due_date && p.due_date < p.start_date

        p.start_date, p.due_date = p.due_date, p.start_date

      end

      # done ratio = weighted average ratio of leaves

      unless Issue.use_status_for_done_ratio? && p.status && p.status.default_done_ratio

        leaves_count = p.leaves.count

        if leaves_count > 0

          average = p.leaves.average(:estimated_hours).to_f

          if average == 0

            average = 1

          end

          done = p.leaves.sum("COALESCE(estimated_hours, #{average}) * (CASE WHEN is_closed = #{connection.quoted_true} THEN 100 ELSE COALESCE(done_ratio, 0) END)", :include => :status).to_f

          progress = done / (average * leaves_count)

          p.done_ratio = progress.round

        end

      end

      # estimate = sum of leaves estimates

      p.estimated_hours = p.leaves.sum(:estimated_hours).to_f

      p.estimated_hours = nil if p.estimated_hours == 0.0

      # ancestors will be recursively updated

      p.save(false)

    end

  end

  # Update issues so their versions are not pointing to a

  # fixed_version that is not shared with the issue's project

  def self.update_versions(conditions=nil)

    # Only need to update issues with a fixed_version from

    # a different project and that is not systemwide shared

    Issue.all(:conditions => merge_conditions("#{Issue.table_name}.fixed_version_id IS NOT NULL" +

                                                " AND #{Issue.table_name}.project_id <> #{Version.table_name}.project_id" +

                                                " AND #{Version.table_name}.sharing <> 'system'",

                                                conditions),

              :include => [:project, :fixed_version]

              ).each do |issue|

      next if issue.project.nil? || issue.fixed_version.nil?

      unless issue.project.shared_versions.include?(issue.fixed_version)

        issue.init_journal(User.current)

        issue.fixed_version = nil

        issue.save

      end

    end

  end

  # Callback on attachment deletion

  def attachment_removed(obj)

    journal = init_journal(User.current)

    journal.details << JournalDetail.new(:property => 'attachment',

                                         :prop_key => obj.id,

                                         :old_value => obj.filename)

    journal.save

  end

  # Default assignment based on category

  def default_assign

    if assigned_to.nil? && category && category.assigned_to

      self.assigned_to = category.assigned_to

    end

  end

  # Updates start/due dates of following issues

  def reschedule_following_issues

    if start_date_changed? || due_date_changed?

      relations_from.each do |relation|

        relation.set_issue_to_dates

      end

    end

  end

  # Closes duplicates if the issue is being closed

  def close_duplicates

    if closing?

      duplicates.each do |duplicate|

        # Reload is need in case the duplicate was updated by a previous duplicate

        duplicate.reload

        # Don't re-close it if it's already closed

        next if duplicate.closed?

        # Same user and notes

        if @current_journal

          duplicate.init_journal(@current_journal.user, @current_journal.notes)

        end

        duplicate.update_attribute :status, self.status

      end

    end

  end

  # Saves the changes in a Journal

  # Called after_save

  def create_journal

    if @current_journal

      # attributes changes

      (Issue.column_names - %w(id root_id lft rgt lock_version created_on updated_on)).each {|c|

        before = @issue_before_change.send(c)

        after = send(c)

        next if before == after || (before.blank? && after.blank?)

        @current_journal.details << JournalDetail.new(:property => 'attr',

                                                      :prop_key => c,

                                                      :old_value => @issue_before_change.send(c),

                                                      :value => send(c))

      }

      # custom fields changes

      custom_values.each {|c|

        next if (@custom_values_before_change[c.custom_field_id]==c.value ||

                  (@custom_values_before_change[c.custom_field_id].blank? && c.value.blank?))

        @current_journal.details << JournalDetail.new(:property => 'cf',

                                                      :prop_key => c.custom_field_id,

                                                      :old_value => @custom_values_before_change[c.custom_field_id],

                                                      :value => c.value)

      }

      @current_journal.save

      # reset current journal

      init_journal @current_journal.user, @current_journal.notes

    end

  end

  # Query generator for selecting groups of issue counts for a project

  # based on specific criteria

  #

  # Options

  # * project - Project to search in.

  # * field - String. Issue field to key off of in the grouping.

  # * joins - String. The table name to join against.

  def self.count_and_group_by(options)

    project = options.delete(:project)

    select_field = options.delete(:field)

    joins = options.delete(:joins)

    where = "#{Issue.table_name}.#{select_field}=j.id"

    ActiveRecord::Base.connection.select_all("select    s.id as status_id, 

                                                s.is_closed as closed, 

                                                j.id as #{select_field},

                                                count(#{Issue.table_name}.id) as total 

                                              from 

                                                  #{Issue.table_name}, #{Project.table_name}, #{IssueStatus.table_name} s, #{joins} j

                                              where 

                                                #{Issue.table_name}.status_id=s.id 

                                                and #{where}

                                                and #{Issue.table_name}.project_id=#{Project.table_name}.id

                                                and #{visible_condition(User.current, :project => project)}

                                              group by s.id, s.is_closed, j.id")

  end

end