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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 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_DUPLICATED   = "duplicated"

  TYPE_BLOCKS       = "blocks"

  TYPE_BLOCKED      = "blocked"

  TYPE_PRECEDES     = "precedes"

  TYPE_FOLLOWS      = "follows"

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

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

            TYPE_DUPLICATED =>  { :name => :label_duplicated_by, :sym_name => :label_duplicates, :order => 3, :sym => TYPE_DUPLICATES, :reverse => TYPE_DUPLICATES },

            TYPE_BLOCKS =>      { :name => :label_blocks, :sym_name => :label_blocked_by, :order => 4, :sym => TYPE_BLOCKED },

            TYPE_BLOCKED =>     { :name => :label_blocked_by, :sym_name => :label_blocks, :order => 5, :sym => TYPE_BLOCKS, :reverse => TYPE_BLOCKS },

            TYPE_PRECEDES =>    { :name => :label_precedes, :sym_name => :label_follows, :order => 6, :sym => TYPE_FOLLOWS },

            TYPE_FOLLOWS =>     { :name => :label_follows, :sym_name => :label_precedes, :order => 7, :sym => TYPE_PRECEDES, :reverse => TYPE_PRECEDES }

          }.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

  validate :validate_issue_relation

  attr_protected :issue_from_id, :issue_to_id

  before_save :handle_issue_order

  def visible?(user=User.current)

    (issue_from.nil? || issue_from.visible?(user)) && (issue_to.nil? || issue_to.visible?(user))

  end

  def deletable?(user=User.current)

    visible?(user) &&

      ((issue_from.nil? || user.allowed_to?(:manage_issue_relations, issue_from.project)) ||

        (issue_to.nil? || user.allowed_to?(:manage_issue_relations, issue_to.project)))

  end

  def after_initialize

    if new_record?

      if relation_type.blank?

        self.relation_type = IssueRelation::TYPE_RELATES

      end

    end

  end

  def validate_issue_relation

    if issue_from && issue_to

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

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

      #detect circular dependencies depending wether the relation should be reversed

      if TYPES.has_key?(relation_type) && TYPES[relation_type][:reverse]

        errors.add :base, :circular_dependency if issue_from.all_dependent_issues.include? issue_to

      else

        errors.add :base, :circular_dependency if issue_to.all_dependent_issues.include? issue_from

      end

      errors.add :base, :cant_link_an_issue_with_a_descendant if issue_from.is_descendant_of?(issue_to) || issue_from.is_ancestor_of?(issue_to)

    end

  end

  def other_issue(issue)

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

  end

  # Returns the relation type for +issue+

  def relation_type_for(issue)

    if TYPES[relation_type]

      if self.issue_from_id == issue.id

        relation_type

      else

        TYPES[relation_type][:sym]

      end

    end

  end

  def label_for(issue)

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

  end

  def handle_issue_order

    reverse_if_needed

    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

      issue_to.reschedule_after(soonest_start)

    end

  end

  def successor_soonest_start

    if (TYPE_PRECEDES == self.relation_type) && delay && issue_from && (issue_from.start_date || issue_from.due_date)

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

    end

  end

  def <=>(relation)

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

  end

  private

  # Reverses the relation if needed so that it gets stored in the proper way

  # Should not be reversed before validation so that it can be displayed back

  # as entered on new relation form

  def reverse_if_needed

    if TYPES.has_key?(relation_type) && TYPES[relation_type][:reverse]

      issue_tmp = issue_to

      self.issue_to = issue_from

      self.issue_from = issue_tmp

      self.relation_type = TYPES[relation_type][:reverse]

    end

  end

end