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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 Issue < ActiveRecord::Base

  include Redmine::SafeAttributes

  include Redmine::Utils::DateCalculation

  include Redmine::I18n

  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 => 'Principal', :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 :visible_journals,

    :class_name => 'Journal',

    :as => :journalized,

    :conditions => Proc.new {

      ["(#{Journal.table_name}.private_notes = ? OR (#{Project.allowed_to_condition(User.current, :view_private_notes)}))", false]

    },

    :readonly => true

  has_many :time_entries, :dependent => :destroy

  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_add => :attachment_added, :after_remove => :attachment_removed

  acts_as_customizable

  acts_as_watchable

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

                     :include => [:project, :visible_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

  delegate :notes, :notes=, :private_notes, :private_notes=, :to => :current_journal, :allow_nil => true

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

  validates_length_of :subject, :maximum => 255

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

  validates :estimated_hours, :numericality => {:greater_than_or_equal_to => 0, :allow_nil => true, :message => :invalid}

  validates :start_date, :date => true

  validates :due_date, :date => true

  validate :validate_issue, :validate_required_fields

  scope :visible, lambda {|*args|

    includes(:project).where(Issue.visible_condition(args.shift || User.current, *args))

  }

  scope :open, lambda {|*args|

    is_closed = args.size > 0 ? !args.first : false

    includes(:status).where("#{IssueStatus.table_name}.is_closed = ?", is_closed)

  }

  scope :recently_updated, lambda { order("#{Issue.table_name}.updated_on DESC") }

  scope :on_active_project, lambda {

    includes(:status, :project, :tracker).where("#{Project.table_name}.status = ?", Project::STATUS_ACTIVE)

  }

  scope :fixed_version, lambda {|versions|

    ids = [versions].flatten.compact.map {|v| v.is_a?(Version) ? v.id : v}

    ids.any? ? where(:fixed_version_id => ids) : where('1=0')

  }

  before_create :default_assign

  before_save :close_duplicates, :update_done_ratio_from_issue_status,

              :force_updated_on_change, :update_closed_on, :set_assigned_to_was

  after_save {|issue| issue.send :after_project_change if !issue.id_changed? && issue.project_id_changed?}

  after_save :reschedule_following_issues, :update_nested_set_attributes,

             :update_parent_attributes, :create_journal

  # Should be after_create but would be called before previous after_save callbacks

  after_save :after_create_from_copy

  after_destroy :update_parent_attributes

  after_create :send_notification

  # Keep it at the end of after_save callbacks

  after_save :clear_assigned_to_was

  # 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|

      if user.logged?

        case role.issues_visibility

        when 'all'

          nil

        when 'default'

          user_ids = [user.id] + user.groups.map(&:id).compact

          "(#{table_name}.is_private = #{connection.quoted_false} OR #{table_name}.author_id = #{user.id} OR #{table_name}.assigned_to_id IN (#{user_ids.join(',')}))"

        when 'own'

          user_ids = [user.id] + user.groups.map(&:id).compact

          "(#{table_name}.author_id = #{user.id} OR #{table_name}.assigned_to_id IN (#{user_ids.join(',')}))"

        else

          '1=0'

        end

      else

        "(#{table_name}.is_private = #{connection.quoted_false})"

      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|

      if user.logged?

        case role.issues_visibility

        when 'all'

          true

        when 'default'

          !self.is_private? || (self.author == user || user.is_or_belongs_to?(assigned_to))

        when 'own'

          self.author == user || user.is_or_belongs_to?(assigned_to)

        else

          false

        end

      else

        !self.is_private?

      end

    end

  end

  # Returns true if user or current user is allowed to edit or add a note to the issue

  def editable?(user=User.current)

    user.allowed_to?(:edit_issues, project) || user.allowed_to?(:add_issue_notes, project)

  end

  def initialize(attributes=nil, *args)

    super

    if new_record?

      # set default values for new records only

      self.status ||= IssueStatus.default

      self.priority ||= IssuePriority.default

      self.watcher_user_ids = []

    end

  end

  def create_or_update

    super

  ensure

    @status_was = nil

  end

  private :create_or_update

  # AR#Persistence#destroy would raise and RecordNotFound exception

  # if the issue was already deleted or updated (non matching lock_version).

  # This is a problem when bulk deleting issues or deleting a project

  # (because an issue may already be deleted if its parent was deleted

  # first).

  # The issue is reloaded by the nested_set before being deleted so

  # the lock_version condition should not be an issue but we handle it.

  def destroy

    super

  rescue ActiveRecord::RecordNotFound

    # Stale or already deleted

    begin

      reload

    rescue ActiveRecord::RecordNotFound

      # The issue was actually already deleted

      @destroyed = true

      return freeze

    end

    # The issue was stale, retry to destroy

    super

  end

  alias :base_reload :reload

  def reload(*args)

    @workflow_rule_by_attribute = nil

    @assignable_versions = nil

    @relations = nil

    base_reload(*args)

  end

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

  def available_custom_fields

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

  end

  def visible_custom_field_values(user=nil)

    user_real = user || User.current

    custom_field_values.select do |value|

      value.custom_field.visible_by?(project, user_real)

    end

  end

  # Copies attributes from another issue, arg can be an id or an Issue

  def copy_from(arg, options={})

    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.author = User.current

    unless options[:attachments] == false

      self.attachments = issue.attachments.map do |attachement|

        attachement.copy(:container => self)

      end

    end

    @copied_from = issue

    @copy_options = options

    self

  end

  # Returns an unsaved copy of the issue

  def copy(attributes=nil, copy_options={})

    copy = self.class.new.copy_from(self, copy_options)

    copy.attributes = attributes if attributes

    copy

  end

  # Returns true if the issue is a copy

  def copy?

    @copied_from.present?

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

    ActiveSupport::Deprecation.warn "Issue#move_to_project is deprecated, use #project= instead."

    if options[:copy]

      issue = self.copy

    else

      issue = self

    end

    issue.init_journal(User.current, options[:notes])

    # Preserve previous behaviour

    # #move_to_project doesn't change tracker automatically

    issue.send :project=, new_project, true

    if new_tracker

      issue.tracker = new_tracker

    end

    # Allow bulk setting of attributes on the issue

    if options[:attributes]

      issue.attributes = options[:attributes]

    end

    issue.save ? issue : false

  end

  def status_id=(sid)

    self.status = nil

    result = write_attribute(:status_id, sid)

    @workflow_rule_by_attribute = nil

    result

  end

  def priority_id=(pid)

    self.priority = nil

    write_attribute(:priority_id, pid)

  end

  def category_id=(cid)

    self.category = nil

    write_attribute(:category_id, cid)

  end

  def fixed_version_id=(vid)

    self.fixed_version = nil

    write_attribute(:fixed_version_id, vid)

  end

  def tracker_id=(tid)

    self.tracker = nil

    result = write_attribute(:tracker_id, tid)

    @custom_field_values = nil

    @workflow_rule_by_attribute = nil

    result

  end

  def project_id=(project_id)

    if project_id.to_s != self.project_id.to_s

      self.project = (project_id.present? ? Project.find_by_id(project_id) : nil)

    end

  end

  def project=(project, keep_tracker=false)

    project_was = self.project

    write_attribute(:project_id, project ? project.id : nil)

    association_instance_set('project', project)

    if project_was && project && project_was != project

      @assignable_versions = nil

      unless keep_tracker || project.trackers.include?(tracker)

        self.tracker = project.trackers.first

      end

      # Reassign to the category with same name if any

      if category

        self.category = project.issue_categories.find_by_name(category.name)

      end

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

      if fixed_version && fixed_version.project != project && !project.shared_versions.include?(fixed_version)

        self.fixed_version = nil

      end

      # Clear the parent task if it's no longer valid

      unless valid_parent_project?

        self.parent_issue_id = nil

      end

      @custom_field_values = nil

    end

  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 assign_attributes so that project and tracker get assigned first

  def assign_attributes_with_project_and_tracker_first(new_attributes, *args)

    return if new_attributes.nil?

    attrs = new_attributes.dup

    attrs.stringify_keys!

    %w(project project_id tracker tracker_id).each do |attr|

      if attrs.has_key?(attr)

        send "#{attr}=", attrs.delete(attr)

      end

    end

    send :assign_attributes_without_project_and_tracker_first, attrs, *args

  end

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

  alias_method_chain(:assign_attributes, :project_and_tracker_first) unless method_defined?(:assign_attributes_without_project_and_tracker_first)

  def estimated_hours=(h)

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

  end

  safe_attributes 'project_id',

    :if => lambda {|issue, user|

      if issue.new_record?

        issue.copy?

      elsif user.allowed_to?(:move_issues, issue.project)

        Issue.allowed_target_projects_on_move.count > 1

      end

    }

  safe_attributes 'tracker_id',

    'status_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',

    'notes',

    :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',

    'lock_version',

    'notes',

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

  safe_attributes 'notes',

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

  safe_attributes 'private_notes',

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

  safe_attributes 'watcher_user_ids',

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

  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))

    }

  safe_attributes 'parent_issue_id',

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

      user.allowed_to?(:manage_subtasks, issue.project)}

  def safe_attribute_names(user=nil)

    names = super

    names -= disabled_core_fields

    names -= read_only_attribute_names(user)

    names

  end

  # 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

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

    return unless attrs.is_a?(Hash)

    attrs = attrs.dup

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

    if (p = attrs.delete('project_id')) && safe_attribute?('project_id')

      if allowed_target_projects(user).where(:id => p.to_i).exists?

        self.project_id = p

      end

    end

    if (t = attrs.delete('tracker_id')) && safe_attribute?('tracker_id')

      self.tracker_id = t

    end

    if (s = attrs.delete('status_id')) && safe_attribute?('status_id')

      if new_statuses_allowed_to(user).collect(&:id).include?(s.to_i)

        self.status_id = s

      end

    end

    attrs = delete_unsafe_attributes(attrs, user)

    return if attrs.empty?

    unless leaf?

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

    end

    if attrs['parent_issue_id'].present?

      s = attrs['parent_issue_id'].to_s

      unless (m = s.match(%r{\A#?(\d+)\z})) && (m[1] == parent_id.to_s || Issue.visible(user).exists?(m[1]))

        @invalid_parent_issue_id = attrs.delete('parent_issue_id')

      end

    end

    if attrs['custom_field_values'].present?

      editable_custom_field_ids = editable_custom_field_values(user).map {|v| v.custom_field_id.to_s}

      # TODO: use #select when ruby1.8 support is dropped

      attrs['custom_field_values'] = attrs['custom_field_values'].reject {|k, v| !editable_custom_field_ids.include?(k.to_s)}

    end

    if attrs['custom_fields'].present?

      editable_custom_field_ids = editable_custom_field_values(user).map {|v| v.custom_field_id.to_s}

      # TODO: use #select when ruby1.8 support is dropped

      attrs['custom_fields'] = attrs['custom_fields'].reject {|c| !editable_custom_field_ids.include?(c['id'].to_s)}

    end

    # mass-assignment security bypass

    assign_attributes attrs, :without_protection => true

  end

  def disabled_core_fields

    tracker ? tracker.disabled_core_fields : []

  end

  # Returns the custom_field_values that can be edited by the given user

  def editable_custom_field_values(user=nil)

    visible_custom_field_values(user).reject do |value|

      read_only_attribute_names(user).include?(value.custom_field_id.to_s)

    end

  end

  # Returns the custom fields that can be edited by the given user

  def editable_custom_fields(user=nil)

    editable_custom_field_values(user).map(&:custom_field).uniq

  end

  # Returns the names of attributes that are read-only for user or the current user

  # For users with multiple roles, the read-only fields are the intersection of

  # read-only fields of each role

  # The result is an array of strings where sustom fields are represented with their ids

  #

  # Examples:

  #   issue.read_only_attribute_names # => ['due_date', '2']

  #   issue.read_only_attribute_names(user) # => []

  def read_only_attribute_names(user=nil)

    workflow_rule_by_attribute(user).reject {|attr, rule| rule != 'readonly'}.keys

  end

  # Returns the names of required attributes for user or the current user

  # For users with multiple roles, the required fields are the intersection of

  # required fields of each role

  # The result is an array of strings where sustom fields are represented with their ids

  #

  # Examples:

  #   issue.required_attribute_names # => ['due_date', '2']

  #   issue.required_attribute_names(user) # => []

  def required_attribute_names(user=nil)

    workflow_rule_by_attribute(user).reject {|attr, rule| rule != 'required'}.keys

  end

  # Returns true if the attribute is required for user

  def required_attribute?(name, user=nil)

    required_attribute_names(user).include?(name.to_s)

  end

  # Returns a hash of the workflow rule by attribute for the given user

  #

  # Examples:

  #   issue.workflow_rule_by_attribute # => {'due_date' => 'required', 'start_date' => 'readonly'}

  def workflow_rule_by_attribute(user=nil)

    return @workflow_rule_by_attribute if @workflow_rule_by_attribute && user.nil?

    user_real = user || User.current

    roles = user_real.admin ? Role.all : user_real.roles_for_project(project)

    return {} if roles.empty?

    result = {}

    workflow_permissions = WorkflowPermission.where(:tracker_id => tracker_id, :old_status_id => status_id, :role_id => roles.map(&:id)).all

    if workflow_permissions.any?

      workflow_rules = workflow_permissions.inject({}) do |h, wp|

        h[wp.field_name] ||= []

        h[wp.field_name] << wp.rule

        h

      end

      workflow_rules.each do |attr, rules|

        next if rules.size < roles.size

        uniq_rules = rules.uniq

        if uniq_rules.size == 1

          result[attr] = uniq_rules.first

        else

          result[attr] = 'required'

        end

      end

    end

    @workflow_rule_by_attribute = result if user.nil?

    result

  end

  private :workflow_rule_by_attribute

  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_issue

    if due_date && start_date && (start_date_changed? || due_date_changed?) && due_date < start_date

      errors.add :due_date, :greater_than_start_date

    end

    if start_date && start_date_changed? && soonest_start && start_date < soonest_start

      errors.add :start_date, :earlier_than_minimum_start_date, :date => format_date(soonest_start)

    end

    if fixed_version

      if !assignable_versions.include?(fixed_version)

        errors.add :fixed_version_id, :inclusion

      elsif reopened? && fixed_version.closed?

        errors.add :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 @invalid_parent_issue_id.present?

      errors.add :parent_issue_id, :invalid

    elsif @parent_issue

      if !valid_parent_project?(@parent_issue)

        errors.add :parent_issue_id, :invalid

      elsif (@parent_issue != parent) && (all_dependent_issues.include?(@parent_issue) || @parent_issue.all_dependent_issues.include?(self))

        errors.add :parent_issue_id, :invalid

      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, :invalid

        end

      end

    end

  end

  # Validates the issue against additional workflow requirements

  def validate_required_fields

    user = new_record? ? author : current_journal.try(:user)

    required_attribute_names(user).each do |attribute|

      if attribute =~ /^\d+$/

        attribute = attribute.to_i

        v = custom_field_values.detect {|v| v.custom_field_id == attribute }

        if v && v.value.blank?

          errors.add :base, v.custom_field.name + ' ' + l('activerecord.errors.messages.blank')

        end

      else

        if respond_to?(attribute) && send(attribute).blank?

          errors.add attribute, :blank

        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)

    if new_record?

      @current_journal.notify = false

    else

      @attributes_before_change = attributes.dup

      @custom_values_before_change = {}

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

    end

    @current_journal

  end

  # Returns the id of the last journal or nil

  def last_journal_id

    if new_record?

      nil

    else

      journals.maximum(:id)

    end

  end

  # Returns a scope for journals that have an id greater than journal_id

  def journals_after(journal_id)

    scope = journals.reorder("#{Journal.table_name}.id ASC")

    if journal_id.present?

      scope = scope.where("#{Journal.table_name}.id > ?", journal_id.to_i)

    end

    scope

  end

  # Returns the initial status of the issue

  # Returns nil for a new issue

  def status_was

    if status_id_was && status_id_was.to_i > 0

      @status_was ||= IssueStatus.find_by_id(status_id_was)

    end

  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?

      if status_was && status && !status_was.is_closed? && status.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 << assigned_to if assigned_to

    users.uniq.sort

  end

  # Versions that the issue can be assigned to

  def assignable_versions

    return @assignable_versions if @assignable_versions

    versions = project.shared_versions.open.all

    if fixed_version

      if fixed_version_id_changed?

        # nothing to do

      elsif project_id_changed?

        if project.shared_versions.include?(fixed_version)

          versions << fixed_version

        end

      else

        versions << fixed_version

      end

    end

    @assignable_versions = versions.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 statuses that user is able to apply

  def new_statuses_allowed_to(user=User.current, include_default=false)

    if new_record? && @copied_from

      [IssueStatus.default, @copied_from.status].compact.uniq.sort

    else

      initial_status = nil

      if new_record?

        initial_status = IssueStatus.default

      elsif status_id_was

        initial_status = IssueStatus.find_by_id(status_id_was)

      end

      initial_status ||= status

      initial_assigned_to_id = assigned_to_id_changed? ? assigned_to_id_was : assigned_to_id

      assignee_transitions_allowed = initial_assigned_to_id.present? &&

        (user.id == initial_assigned_to_id || user.group_ids.include?(initial_assigned_to_id))

      statuses = initial_status.find_new_statuses_allowed_to(

        user.admin ? Role.all : user.roles_for_project(project),

        tracker,

        author == user,

        assignee_transitions_allowed

        )

      statuses << initial_status unless statuses.empty?

      statuses << IssueStatus.default if include_default

      statuses = statuses.compact.uniq.sort

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

    end

  end

  # Returns the previous assignee if changed

  def assigned_to_was

    # assigned_to_id_was is reset before after_save callbacks

    user_id = @previous_assigned_to_id || assigned_to_id_was

    if user_id && user_id != assigned_to_id

      @assigned_to_was ||= User.find_by_id(user_id)

    end

  end

  # Returns the users that should be notified

  def notified_users

    notified = []

    # Author and assignee are always notified unless they have been

    # locked or don't want to be notified

    notified << author if author

    if assigned_to

      notified += (assigned_to.is_a?(Group) ? assigned_to.users : [assigned_to])

    end

    if assigned_to_was

      notified += (assigned_to_was.is_a?(Group) ? assigned_to_was.users : [assigned_to_was])

    end

    notified = notified.select {|u| u.active? && u.notify_about?(self)}

    notified += project.notified_users

    notified.uniq!

    # Remove users that can not view the issue

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

    notified

  end

  # Returns the email addresses that should be notified

  def recipients

    notified_users.collect(&:mail)

  end

  def each_notification(users, &block)

    if users.any?

      if custom_field_values.detect {|value| !value.custom_field.visible?}

        users_by_custom_field_visibility = users.group_by do |user|

          visible_custom_field_values(user).map(&:custom_field_id).sort

        end

        users_by_custom_field_visibility.values.each do |users|

          yield(users)

        end

      else

        yield(users)

      end

    end

  end

  # Returns the number of hours spent on this issue

  def spent_hours

    @spent_hours ||= time_entries.sum(:hours) || 0

  end

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

  #

  # Example:

  #   spent_hours => 0.0

  #   spent_hours => 50.2

  def total_spent_hours

    @total_spent_hours ||=

      self_and_descendants.

        joins("LEFT JOIN #{TimeEntry.table_name} ON #{TimeEntry.table_name}.issue_id = #{Issue.table_name}.id").

        sum("#{TimeEntry.table_name}.hours").to_f || 0.0

  end

  def relations

    @relations ||= IssueRelation::Relations.new(self, (relations_from + relations_to).sort)

  end

  # Preloads relations for a collection of issues

  def self.load_relations(issues)

    if issues.any?

      relations = IssueRelation.where("issue_from_id IN (:ids) OR issue_to_id IN (:ids)", :ids => issues.map(&:id)).all

      issues.each do |issue|

        issue.instance_variable_set "@relations", relations.select {|r| r.issue_from_id == issue.id || r.issue_to_id == issue.id}