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# Redmine - project management software

# Copyright (C) 2006-2012  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 Project < ActiveRecord::Base

  include Redmine::SafeAttributes

  # Project statuses

  STATUS_ACTIVE     = 1

  STATUS_CLOSED     = 5

  STATUS_ARCHIVED   = 9

  # Maximum length for project identifiers

  IDENTIFIER_MAX_LENGTH = 100

  # Specific overidden Activities

  has_many :time_entry_activities

  has_many :members, :include => [:principal, :roles], :conditions => "#{User.table_name}.type='User' AND #{User.table_name}.status=#{User::STATUS_ACTIVE}"

  has_many :memberships, :class_name => 'Member'

  has_many :member_principals, :class_name => 'Member',

                               :include => :principal,

                               :conditions => "#{Principal.table_name}.type='Group' OR (#{Principal.table_name}.type='User' AND #{Principal.table_name}.status=#{User::STATUS_ACTIVE})"

  has_many :users, :through => :members

  has_many :principals, :through => :member_principals, :source => :principal

  has_many :enabled_modules, :dependent => :delete_all

  has_and_belongs_to_many :trackers, :order => "#{Tracker.table_name}.position"

  has_many :issues, :dependent => :destroy, :include => [:status, :tracker]

  has_many :issue_changes, :through => :issues, :source => :journals

  has_many :versions, :dependent => :destroy, :order => "#{Version.table_name}.effective_date DESC, #{Version.table_name}.name DESC"

  has_many :time_entries, :dependent => :delete_all

  has_many :queries, :dependent => :delete_all

  has_many :documents, :dependent => :destroy

  has_many :news, :dependent => :destroy, :include => :author

  has_many :issue_categories, :dependent => :delete_all, :order => "#{IssueCategory.table_name}.name"

  has_many :boards, :dependent => :destroy, :order => "position ASC"

  has_one :repository, :conditions => ["is_default = ?", true]

  has_many :repositories, :dependent => :destroy

  has_many :changesets, :through => :repository

  has_one :wiki, :dependent => :destroy

  # Custom field for the project issues

  has_and_belongs_to_many :issue_custom_fields,

                          :class_name => 'IssueCustomField',

                          :order => "#{CustomField.table_name}.position",

                          :join_table => "#{table_name_prefix}custom_fields_projects#{table_name_suffix}",

                          :association_foreign_key => 'custom_field_id'

  acts_as_nested_set :order => 'name', :dependent => :destroy

  acts_as_attachable :view_permission => :view_files,

                     :delete_permission => :manage_files

  acts_as_customizable

  acts_as_searchable :columns => ['name', 'identifier', 'description'], :project_key => 'id', :permission => nil

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

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

                :author => nil

  attr_protected :status

  validates_presence_of :name, :identifier

  validates_uniqueness_of :identifier

  validates_associated :repository, :wiki

  validates_length_of :name, :maximum => 255

  validates_length_of :homepage, :maximum => 255

  validates_length_of :identifier, :in => 1..IDENTIFIER_MAX_LENGTH

  # donwcase letters, digits, dashes but not digits only

  validates_format_of :identifier, :with => /^(?!\d+$)[a-z0-9\-_]*$/, :if => Proc.new { |p| p.identifier_changed? }

  # reserved words

  validates_exclusion_of :identifier, :in => %w( new )

  after_save :update_position_under_parent, :if => Proc.new {|project| project.name_changed?}

  before_destroy :delete_all_members

  scope :has_module, lambda { |mod| { :conditions => ["#{Project.table_name}.id IN (SELECT em.project_id FROM #{EnabledModule.table_name} em WHERE em.name=?)", mod.to_s] } }

  scope :active, { :conditions => "#{Project.table_name}.status = #{STATUS_ACTIVE}"}

  scope :status, lambda {|arg| arg.blank? ? {} : {:conditions => {:status => arg.to_i}} }

  scope :all_public, { :conditions => { :is_public => true } }

  scope :visible, lambda {|*args| {:conditions => Project.visible_condition(args.shift || User.current, *args) }}

  scope :visible_roots, lambda { { :conditions => Project.root_visible_by(User.current) } }

  scope :allowed_to, lambda {|*args|

    user = User.current

    permission = nil

    if args.first.is_a?(Symbol)

      permission = args.shift

    else

      user = args.shift

      permission = args.shift

    end

    { :conditions => Project.allowed_to_condition(user, permission, *args) }

  }

  scope :like, lambda {|arg|

    if arg.blank?

      {}

    else

      pattern = "%#{arg.to_s.strip.downcase}%"

      {:conditions => ["LOWER(identifier) LIKE :p OR LOWER(name) LIKE :p", {:p => pattern}]}

    end

  }

  def initialize(attributes=nil, *args)

    super

    initialized = (attributes || {}).stringify_keys

    if !initialized.key?('identifier') && Setting.sequential_project_identifiers?

      self.identifier = Project.next_identifier

    end

    if !initialized.key?('is_public')

      self.is_public = Setting.default_projects_public?

    end

    if !initialized.key?('enabled_module_names')

      self.enabled_module_names = Setting.default_projects_modules

    end

    if !initialized.key?('trackers') && !initialized.key?('tracker_ids')

      self.trackers = Tracker.sorted.all

    end

  end

  def identifier=(identifier)

    super unless identifier_frozen?

  end

  def identifier_frozen?

    errors[:identifier].blank? && !(new_record? || identifier.blank?)

  end

  # returns latest created projects

  # non public projects will be returned only if user is a member of those

  def self.latest(user=nil, count=5)

    visible(user).find(:all, :limit => count, :order => "created_on DESC")

  end

  # Returns true if the project is visible to +user+ or to the current user.

  def visible?(user=User.current)

    user.allowed_to?(:view_project, self)

  end

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

  #

  # Examples:

  #   Project.visible_condition(admin)        => "projects.status = 1"

  #   Project.visible_condition(normal_user)  => "((projects.status = 1) AND (projects.is_public = 1 OR projects.id IN (1,3,4)))"

  #   Project.visible_condition(anonymous)    => "((projects.status = 1) AND (projects.is_public = 1))"

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

    allowed_to_condition(user, :view_project, options)

  end

  def self.root_visible_by(user=nil)

    return "#{Project.table_name}.parent_id IS NULL AND " + visible_condition(user)

  end

  # Returns a SQL conditions string used to find all projects for which +user+ has the given +permission+

  #

  # Valid options:

  # * :project => limit the condition to project

  # * :with_subprojects => limit the condition to project and its subprojects

  # * :member => limit the condition to the user projects

  def self.allowed_to_condition(user, permission, options={})

    perm = Redmine::AccessControl.permission(permission)

    base_statement = (perm && perm.read? ? "#{Project.table_name}.status <> #{Project::STATUS_ARCHIVED}" : "#{Project.table_name}.status = #{Project::STATUS_ACTIVE}")

    if perm && perm.project_module

      # If the permission belongs to a project module, make sure the module is enabled

      base_statement << " AND #{Project.table_name}.id IN (SELECT em.project_id FROM #{EnabledModule.table_name} em WHERE em.name='#{perm.project_module}')"

    end

    if options[:project]

      project_statement = "#{Project.table_name}.id = #{options[:project].id}"

      project_statement << " OR (#{Project.table_name}.lft > #{options[:project].lft} AND #{Project.table_name}.rgt < #{options[:project].rgt})" if options[:with_subprojects]

      base_statement = "(#{project_statement}) AND (#{base_statement})"

    end

    if user.admin?

      base_statement

    else

      statement_by_role = {}

      unless options[:member]

        role = user.logged? ? Role.non_member : Role.anonymous

        if role.allowed_to?(permission)

          statement_by_role[role] = "#{Project.table_name}.is_public = #{connection.quoted_true}"

        end

      end

      if user.logged?

        user.projects_by_role.each do |role, projects|

          if role.allowed_to?(permission) && projects.any?

            statement_by_role[role] = "#{Project.table_name}.id IN (#{projects.collect(&:id).join(',')})"

          end

        end

      end

      if statement_by_role.empty?

        "1=0"

      else

        if block_given?

          statement_by_role.each do |role, statement|

            if s = yield(role, user)

              statement_by_role[role] = "(#{statement} AND (#{s}))"

            end

          end

        end

        "((#{base_statement}) AND (#{statement_by_role.values.join(' OR ')}))"

      end

    end

  end

  # Returns the Systemwide and project specific activities

  def activities(include_inactive=false)

    if include_inactive

      return all_activities

    else

      return active_activities

    end

  end

  # Will create a new Project specific Activity or update an existing one

  #

  # This will raise a ActiveRecord::Rollback if the TimeEntryActivity

  # does not successfully save.

  def update_or_create_time_entry_activity(id, activity_hash)

    if activity_hash.respond_to?(:has_key?) && activity_hash.has_key?('parent_id')

      self.create_time_entry_activity_if_needed(activity_hash)

    else

      activity = project.time_entry_activities.find_by_id(id.to_i)

      activity.update_attributes(activity_hash) if activity

    end

  end

  # Create a new TimeEntryActivity if it overrides a system TimeEntryActivity

  #

  # This will raise a ActiveRecord::Rollback if the TimeEntryActivity

  # does not successfully save.

  def create_time_entry_activity_if_needed(activity)

    if activity['parent_id']

      parent_activity = TimeEntryActivity.find(activity['parent_id'])

      activity['name'] = parent_activity.name

      activity['position'] = parent_activity.position

      if Enumeration.overridding_change?(activity, parent_activity)

        project_activity = self.time_entry_activities.create(activity)

        if project_activity.new_record?

          raise ActiveRecord::Rollback, "Overridding TimeEntryActivity was not successfully saved"

        else

          self.time_entries.update_all("activity_id = #{project_activity.id}", ["activity_id = ?", parent_activity.id])

        end

      end

    end

  end

  # Returns a :conditions SQL string that can be used to find the issues associated with this project.

  #

  # Examples:

  #   project.project_condition(true)  => "(projects.id = 1 OR (projects.lft > 1 AND projects.rgt < 10))"

  #   project.project_condition(false) => "projects.id = 1"

  def project_condition(with_subprojects)

    cond = "#{Project.table_name}.id = #{id}"

    cond = "(#{cond} OR (#{Project.table_name}.lft > #{lft} AND #{Project.table_name}.rgt < #{rgt}))" if with_subprojects

    cond

  end

  def self.find(*args)

    if args.first && args.first.is_a?(String) && !args.first.match(/^\d*$/)

      project = find_by_identifier(*args)

      raise ActiveRecord::RecordNotFound, "Couldn't find Project with identifier=#{args.first}" if project.nil?

      project

    else

      super

    end

  end

  def self.find_by_param(*args)

    self.find(*args)

  end

  def reload(*args)

    @shared_versions = nil

    @rolled_up_versions = nil

    @rolled_up_trackers = nil

    @all_issue_custom_fields = nil

    @all_time_entry_custom_fields = nil

    @to_param = nil

    @allowed_parents = nil

    @allowed_permissions = nil

    @actions_allowed = nil

    super

  end

  def to_param

    # id is used for projects with a numeric identifier (compatibility)

    @to_param ||= (identifier.to_s =~ %r{^\d*$} ? id.to_s : identifier)

  end

  def active?

    self.status == STATUS_ACTIVE

  end

  def archived?

    self.status == STATUS_ARCHIVED

  end

  # Archives the project and its descendants

  def archive

    # Check that there is no issue of a non descendant project that is assigned

    # to one of the project or descendant versions

    v_ids = self_and_descendants.collect {|p| p.version_ids}.flatten

    if v_ids.any? && Issue.find(:first, :include => :project,

                                        :conditions => ["(#{Project.table_name}.lft < ? OR #{Project.table_name}.rgt > ?)" +

                                                        " AND #{Issue.table_name}.fixed_version_id IN (?)", lft, rgt, v_ids])

      return false

    end

    Project.transaction do

      archive!

    end

    true

  end

  # Unarchives the project

  # All its ancestors must be active

  def unarchive

    return false if ancestors.detect {|a| !a.active?}

    update_attribute :status, STATUS_ACTIVE

  end

  def close

    self_and_descendants.status(STATUS_ACTIVE).update_all :status => STATUS_CLOSED

  end

  def reopen

    self_and_descendants.status(STATUS_CLOSED).update_all :status => STATUS_ACTIVE

  end

  # Returns an array of projects the project can be moved to

  # by the current user

  def allowed_parents

    return @allowed_parents if @allowed_parents

    @allowed_parents = Project.find(:all, :conditions => Project.allowed_to_condition(User.current, :add_subprojects))

    @allowed_parents = @allowed_parents - self_and_descendants

    if User.current.allowed_to?(:add_project, nil, :global => true) || (!new_record? && parent.nil?)

      @allowed_parents << nil

    end

    unless parent.nil? || @allowed_parents.empty? || @allowed_parents.include?(parent)

      @allowed_parents << parent

    end

    @allowed_parents

  end

  # Sets the parent of the project with authorization check

  def set_allowed_parent!(p)

    unless p.nil? || p.is_a?(Project)

      if p.to_s.blank?

        p = nil

      else

        p = Project.find_by_id(p)

        return false unless p

      end

    end

    if p.nil?

      if !new_record? && allowed_parents.empty?

        return false

      end

    elsif !allowed_parents.include?(p)

      return false

    end

    set_parent!(p)

  end

  # Sets the parent of the project

  # Argument can be either a Project, a String, a Fixnum or nil

  def set_parent!(p)

    unless p.nil? || p.is_a?(Project)

      if p.to_s.blank?

        p = nil

      else

        p = Project.find_by_id(p)

        return false unless p

      end

    end

    if p == parent && !p.nil?

      # Nothing to do

      true

    elsif p.nil? || (p.active? && move_possible?(p))

      set_or_update_position_under(p)

      Issue.update_versions_from_hierarchy_change(self)

      true

    else

      # Can not move to the given target

      false

    end

  end

  # Recalculates all lft and rgt values based on project names

  # Unlike Project.rebuild!, these values are recalculated even if the tree "looks" valid

  # Used in BuildProjectsTree migration

  def self.rebuild_tree!

    transaction do

      update_all "lft = NULL, rgt = NULL"

      rebuild!(false)

    end

  end

  # Returns an array of the trackers used by the project and its active sub projects

  def rolled_up_trackers

    @rolled_up_trackers ||=

      Tracker.find(:all, :joins => :projects,

                         :select => "DISTINCT #{Tracker.table_name}.*",

                         :conditions => ["#{Project.table_name}.lft >= ? AND #{Project.table_name}.rgt <= ? AND #{Project.table_name}.status <> #{STATUS_ARCHIVED}", lft, rgt],

                         :order => "#{Tracker.table_name}.position")

  end

  # Closes open and locked project versions that are completed

  def close_completed_versions

    Version.transaction do

      versions.find(:all, :conditions => {:status => %w(open locked)}).each do |version|

        if version.completed?

          version.update_attribute(:status, 'closed')

        end

      end

    end

  end

  # Returns a scope of the Versions on subprojects

  def rolled_up_versions

    @rolled_up_versions ||=

      Version.scoped(:include => :project,

                     :conditions => ["#{Project.table_name}.lft >= ? AND #{Project.table_name}.rgt <= ? AND #{Project.table_name}.status <> #{STATUS_ARCHIVED}", lft, rgt])

  end

  # Returns a scope of the Versions used by the project

  def shared_versions

    if new_record?

      Version.scoped(:include => :project,

                     :conditions => "#{Project.table_name}.status <> #{Project::STATUS_ARCHIVED} AND #{Version.table_name}.sharing = 'system'")

    else

      @shared_versions ||= begin

        r = root? ? self : root

        Version.scoped(:include => :project,

                       :conditions => "#{Project.table_name}.id = #{id}" +

                                      " OR (#{Project.table_name}.status <> #{Project::STATUS_ARCHIVED} AND (" +

                                          " #{Version.table_name}.sharing = 'system'" +

                                          " OR (#{Project.table_name}.lft >= #{r.lft} AND #{Project.table_name}.rgt <= #{r.rgt} AND #{Version.table_name}.sharing = 'tree')" +

                                          " OR (#{Project.table_name}.lft < #{lft} AND #{Project.table_name}.rgt > #{rgt} AND #{Version.table_name}.sharing IN ('hierarchy', 'descendants'))" +

                                          " OR (#{Project.table_name}.lft > #{lft} AND #{Project.table_name}.rgt < #{rgt} AND #{Version.table_name}.sharing = 'hierarchy')" +

                                          "))")

      end

    end

  end

  # Returns a hash of project users grouped by role

  def users_by_role

    members.find(:all, :include => [:user, :roles]).inject({}) do |h, m|

      m.roles.each do |r|

        h[r] ||= []

        h[r] << m.user

      end

      h

    end

  end

  # Deletes all project's members

  def delete_all_members

    me, mr = Member.table_name, MemberRole.table_name

    connection.delete("DELETE FROM #{mr} WHERE #{mr}.member_id IN (SELECT #{me}.id FROM #{me} WHERE #{me}.project_id = #{id})")

    Member.delete_all(['project_id = ?', id])

  end

  # Users/groups issues can be assigned to

  def assignable_users

    assignable = Setting.issue_group_assignment? ? member_principals : members

    assignable.select {|m| m.roles.detect {|role| role.assignable?}}.collect {|m| m.principal}.sort

  end

  # Returns the mail adresses of users that should be always notified on project events

  def recipients

    notified_users.collect {|user| user.mail}

  end

  # Returns the users that should be notified on project events

  def notified_users

    # TODO: User part should be extracted to User#notify_about?

    members.select {|m| m.principal.present? && (m.mail_notification? || m.principal.mail_notification == 'all')}.collect {|m| m.principal}

  end

  # Returns an array of all custom fields enabled for project issues

  # (explictly associated custom fields and custom fields enabled for all projects)

  def all_issue_custom_fields

    @all_issue_custom_fields ||= (IssueCustomField.for_all + issue_custom_fields).uniq.sort

  end

  # Returns an array of all custom fields enabled for project time entries

  # (explictly associated custom fields and custom fields enabled for all projects)

  def all_time_entry_custom_fields

    @all_time_entry_custom_fields ||= (TimeEntryCustomField.for_all + time_entry_custom_fields).uniq.sort

  end

  def project

    self

  end

  def <=>(project)

    name.downcase <=> project.name.downcase

  end

  def to_s

    name

  end

  # Returns a short description of the projects (first lines)

  def short_description(length = 200)

    ## The short description is used in lists, e.g. Latest projects,

    ## My projects etc.  It should be no more than a line or two with

    ## no text formatting.

    ## Original Redmine code: this truncates to the CR that is more

    ## than "length" characters from the start.

    # description.gsub(/^(.{#{length}}[^\n\r]*).*$/m, '\1...').strip if description

    ## That can leave too much text for us, and also we want to omit

    ## images and the like.  Truncate instead to the first CR that

    ## follows _any_ non-blank text, and to the next word break beyond

    ## "length" characters if the result is still longer than that.

    ##

    description.gsub(/![^\s]+!/, '').gsub(/^(\s*[^\n\r]*).*$/m, '\1').gsub(/^(.{#{length}}[^\.;:,-]*).*$/m, '\1 ...').strip if description

  end

  def css_classes

    s = 'project'

    s << ' root' if root?

    s << ' child' if child?

    s << (leaf? ? ' leaf' : ' parent')

    unless active?

      if archived?

        s << ' archived'

      else

        s << ' closed'

      end

    end

    s

  end

  # The earliest start date of a project, based on it's issues and versions

  def start_date

    [

     issues.minimum('start_date'),

     shared_versions.collect(&:effective_date),

     shared_versions.collect(&:start_date)

    ].flatten.compact.min

  end

  # The latest due date of an issue or version

  def due_date

    [

     issues.maximum('due_date'),

     shared_versions.collect(&:effective_date),

     shared_versions.collect {|v| v.fixed_issues.maximum('due_date')}

    ].flatten.compact.max

  end

  def overdue?

    active? && !due_date.nil? && (due_date < Date.today)

  end

  # Returns the percent completed for this project, based on the

  # progress on it's versions.

  def completed_percent(options={:include_subprojects => false})

    if options.delete(:include_subprojects)

      total = self_and_descendants.collect(&:completed_percent).sum

      total / self_and_descendants.count

    else

      if versions.count > 0

        total = versions.collect(&:completed_pourcent).sum

        total / versions.count

      else

        100

      end

    end

  end

  # Return true if this project allows to do the specified action.

  # action can be:

  # * a parameter-like Hash (eg. :controller => 'projects', :action => 'edit')

  # * a permission Symbol (eg. :edit_project)

  def allows_to?(action)

    if archived?

      # No action allowed on archived projects

      return false

    end

    unless active? || Redmine::AccessControl.read_action?(action)

      # No write action allowed on closed projects

      return false

    end

    # No action allowed on disabled modules

    if action.is_a? Hash

      allowed_actions.include? "#{action[:controller]}/#{action[:action]}"

    else

      allowed_permissions.include? action

    end

  end

  def module_enabled?(module_name)

    module_name = module_name.to_s

    enabled_modules.detect {|m| m.name == module_name}

  end

  def enabled_module_names=(module_names)

    if module_names && module_names.is_a?(Array)

      module_names = module_names.collect(&:to_s).reject(&:blank?)

      self.enabled_modules = module_names.collect {|name| enabled_modules.detect {|mod| mod.name == name} || EnabledModule.new(:name => name)}

    else

      enabled_modules.clear

    end

  end

  # Returns an array of the enabled modules names

  def enabled_module_names

    enabled_modules.collect(&:name)

  end

  # Enable a specific module

  #

  # Examples:

  #   project.enable_module!(:issue_tracking)

  #   project.enable_module!("issue_tracking")

  def enable_module!(name)

    enabled_modules << EnabledModule.new(:name => name.to_s) unless module_enabled?(name)

  end

  # Disable a module if it exists

  #

  # Examples:

  #   project.disable_module!(:issue_tracking)

  #   project.disable_module!("issue_tracking")

  #   project.disable_module!(project.enabled_modules.first)

  def disable_module!(target)

    target = enabled_modules.detect{|mod| target.to_s == mod.name} unless enabled_modules.include?(target)

    target.destroy unless target.blank?

  end

  safe_attributes 'name',

    'description',

    'homepage',

    'is_public',

    'identifier',

    'custom_field_values',

    'custom_fields',

    'tracker_ids',

    'issue_custom_field_ids',

    'has_welcome_page'

  safe_attributes 'enabled_module_names',

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

  # Returns an array of projects that are in this project's hierarchy

  #

  # Example: parents, children, siblings

  def hierarchy

    parents = project.self_and_ancestors || []

    descendants = project.descendants || []

    project_hierarchy = parents | descendants # Set union

  end

  # Returns an auto-generated project identifier based on the last identifier used

  def self.next_identifier

    p = Project.find(:first, :order => 'created_on DESC')

    p.nil? ? nil : p.identifier.to_s.succ

  end

  # Copies and saves the Project instance based on the +project+.

  # Duplicates the source project's:

  # * Wiki

  # * Versions

  # * Categories

  # * Issues

  # * Members

  # * Queries

  #

  # Accepts an +options+ argument to specify what to copy

  #

  # Examples:

  #   project.copy(1)                                    # => copies everything

  #   project.copy(1, :only => 'members')                # => copies members only

  #   project.copy(1, :only => ['members', 'versions'])  # => copies members and versions

  def copy(project, options={})

    project = project.is_a?(Project) ? project : Project.find(project)

    to_be_copied = %w(wiki versions issue_categories issues members queries boards)

    to_be_copied = to_be_copied & options[:only].to_a unless options[:only].nil?

    Project.transaction do

      if save

        reload

        to_be_copied.each do |name|

          send "copy_#{name}", project

        end

        Redmine::Hook.call_hook(:model_project_copy_before_save, :source_project => project, :destination_project => self)

        save

      end

    end

  end

  # Copies +project+ and returns the new instance.  This will not save

  # the copy

  def self.copy_from(project)

    begin

      project = project.is_a?(Project) ? project : Project.find(project)

      if project

        # clear unique attributes

        attributes = project.attributes.dup.except('id', 'name', 'identifier', 'status', 'parent_id', 'lft', 'rgt')

        copy = Project.new(attributes)

        copy.enabled_modules = project.enabled_modules

        copy.trackers = project.trackers

        copy.custom_values = project.custom_values.collect {|v| v.clone}

        copy.issue_custom_fields = project.issue_custom_fields

        return copy

      else

        return nil

      end

    rescue ActiveRecord::RecordNotFound

      return nil

    end

  end

  # Yields the given block for each project with its level in the tree

  def self.project_tree(projects, &block)

    ancestors = []

    projects.sort_by(&:lft).each do |project|

      while (ancestors.any? && !project.is_descendant_of?(ancestors.last))

        ancestors.pop

      end

      yield project, ancestors.size

      ancestors << project

    end

  end

  private

  # Copies wiki from +project+

  def copy_wiki(project)

    # Check that the source project has a wiki first

    unless project.wiki.nil?

      wiki = self.wiki || Wiki.new

      wiki.attributes = project.wiki.attributes.dup.except("id", "project_id")

      wiki_pages_map = {}

      project.wiki.pages.each do |page|

        # Skip pages without content

        next if page.content.nil?

        new_wiki_content = WikiContent.new(page.content.attributes.dup.except("id", "page_id", "updated_on"))

        new_wiki_page = WikiPage.new(page.attributes.dup.except("id", "wiki_id", "created_on", "parent_id"))

        new_wiki_page.content = new_wiki_content

        wiki.pages << new_wiki_page

        wiki_pages_map[page.id] = new_wiki_page

      end

      self.wiki = wiki

      wiki.save

      # Reproduce page hierarchy

      project.wiki.pages.each do |page|

        if page.parent_id && wiki_pages_map[page.id]

          wiki_pages_map[page.id].parent = wiki_pages_map[page.parent_id]

          wiki_pages_map[page.id].save

        end

      end

    end

  end

  # Copies versions from +project+

  def copy_versions(project)

    project.versions.each do |version|

      new_version = Version.new

      new_version.attributes = version.attributes.dup.except("id", "project_id", "created_on", "updated_on")

      self.versions << new_version

    end

  end

  # Copies issue categories from +project+

  def copy_issue_categories(project)

    project.issue_categories.each do |issue_category|

      new_issue_category = IssueCategory.new

      new_issue_category.attributes = issue_category.attributes.dup.except("id", "project_id")

      self.issue_categories << new_issue_category

    end

  end

  # Copies issues from +project+

  def copy_issues(project)

    # Stores the source issue id as a key and the copied issues as the

    # value.  Used to map the two togeather for issue relations.

    issues_map = {}

    # Store status and reopen locked/closed versions

    version_statuses = versions.reject(&:open?).map {|version| [version, version.status]}

    version_statuses.each do |version, status|

      version.update_attribute :status, 'open'

    end

    # Get issues sorted by root_id, lft so that parent issues

    # get copied before their children

    project.issues.find(:all, :order => 'root_id, lft').each do |issue|

      new_issue = Issue.new

      new_issue.copy_from(issue, :subtasks => false, :link => false)

      new_issue.project = self

      # Reassign fixed_versions by name, since names are unique per project

      if issue.fixed_version && issue.fixed_version.project == project