Redmine

# redMine - project management software

# Copyright (C) 2006-2007  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 IssueRelation < ActiveRecord::Base

  belongs_to :issue_from, :class_name => 'Issue', :foreign_key => 'issue_from_id'

  belongs_to :issue_to, :class_name => 'Issue', :foreign_key => 'issue_to_id'

  TYPE_RELATES      = "relates"

  TYPE_DUPLICATES   = "duplicates"

  TYPE_BLOCKS       = "blocks"

  TYPE_PRECEDES     = "precedes"

  TYPE_PARENTS     = "parents"

  TYPES = { TYPE_RELATES =>     { :name => :label_relates_to, :sym_name => :label_relates_to, :order => 1 },

            TYPE_DUPLICATES =>  { :name => :label_duplicates, :sym_name => :label_duplicates, :order => 2 },

            TYPE_BLOCKS =>      { :name => :label_blocks, :sym_name => :label_blocked_by, :order => 3 },

            TYPE_PRECEDES =>    { :name => :label_precedes, :sym_name => :label_follows, :order => 4 },

            TYPE_PARENTS =>    { :name => :label_parents, :sym_name => :label_children, :order => 5 },

          }.freeze

  validates_presence_of :issue_from, :issue_to, :relation_type

  validates_inclusion_of :relation_type, :in => TYPES.keys

  validates_numericality_of :delay, :allow_nil => true

  validates_uniqueness_of :issue_to_id, :scope => :issue_from_id

  def validate

    if issue_from && issue_to

      errors.add :issue_to_id, :activerecord_error_invalid if issue_from_id == issue_to_id

      errors.add :issue_to_id, :activerecord_error_not_same_project unless issue_from.project_id == issue_to.project_id || Setting.cross_project_issue_relations?

      errors.add_to_base :activerecord_error_circular_dependency if issue_to.all_dependent_issues.include? issue_from

    end

  end

  def other_issue(issue)

    (self.issue_from_id == issue.id) ? issue_to : issue_from

  end

  def label_for(issue)

    TYPES[relation_type] ? TYPES[relation_type][(self.issue_from_id == issue.id) ? :name : :sym_name] : :unknow

  end

  def before_save

    if TYPE_PRECEDES == relation_type

      self.delay ||= 0

    else

      self.delay = nil

    end

    set_issue_to_dates

  end

  def set_issue_to_dates

    soonest_start = self.successor_soonest_start

    if soonest_start && (!issue_to.start_date || issue_to.start_date < soonest_start)

      issue_to.start_date, issue_to.due_date = successor_soonest_start, successor_soonest_start + issue_to.duration

      issue_to.save

    end

  end

  def successor_soonest_start

    return nil unless (TYPE_PRECEDES == self.relation_type) && (issue_from.start_date || issue_from.due_date)

    (issue_from.due_date || issue_from.start_date) + 1 + delay

  end

  def <=>(relation)

    TYPES[self.relation_type][:order] <=> TYPES[relation.relation_type][:order]

  end

end