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# redMine - project management software

# Copyright (C) 2006  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 Tracker < ActiveRecord::Base

  before_destroy :check_integrity  

  has_many :issues

  has_many :workflows, :dependent => :delete_all do

    def copy(source_tracker)

      Workflow.copy(source_tracker, nil, proxy_owner, nil)

    end

  end

  has_and_belongs_to_many :projects

  has_and_belongs_to_many :custom_fields, :class_name => 'IssueCustomField', :join_table => "#{table_name_prefix}custom_fields_trackers#{table_name_suffix}", :association_foreign_key => 'custom_field_id'

  acts_as_list

  validates_presence_of :name

  validates_uniqueness_of :name

  validates_length_of :name, :maximum => 30

  def to_s; name end

  def <=>(tracker)

    name <=> tracker.name

  end

  def self.all

    find(:all, :order => 'position')

  end

  # Returns an array of IssueStatus that are used

  # in the tracker's workflows

  def issue_statuses

    if @issue_statuses

      return @issue_statuses 

    elsif new_record?

      return []

    end

    ids = Workflow.

            connection.select_rows("SELECT DISTINCT old_status_id, new_status_id FROM #{Workflow.table_name} WHERE tracker_id = #{id}").

            flatten.

            uniq

    @issue_statuses = IssueStatus.find_all_by_id(ids).sort

  end

private

  def check_integrity

    raise "Can't delete tracker" if Issue.find(:first, :conditions => ["tracker_id=?", self.id])

  end

end