# Redmine - project management software
# Copyright (C) 2006-2017  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 IssueStatus < ActiveRecord::Base
  include Redmine::SafeAttributes

  before_destroy :check_integrity
  has_many :workflows, :class_name => 'WorkflowTransition', :foreign_key => "old_status_id"
  has_many :workflow_transitions_as_new_status, :class_name => 'WorkflowTransition', :foreign_key => "new_status_id"
  acts_as_positioned

  after_update :handle_is_closed_change
  before_destroy :delete_workflow_rules

  validates_presence_of :name
  validates_uniqueness_of :name
  validates_length_of :name, :maximum => 30
  validates_inclusion_of :default_done_ratio, :in => 0..100, :allow_nil => true

  scope :sorted, lambda { order(:position) }
  scope :named, lambda {|arg| where("LOWER(#{table_name}.name) = LOWER(?)", arg.to_s.strip)}

  safe_attributes 'name',
    'is_closed',
    'position',
    'default_done_ratio'

  # Update all the +Issues+ setting their done_ratio to the value of their +IssueStatus+
  def self.update_issue_done_ratios
    if Issue.use_status_for_done_ratio?
      IssueStatus.where("default_done_ratio >= 0").each do |status|
        Issue.where({:status_id => status.id}).update_all({:done_ratio => status.default_done_ratio})
      end
    end

    return Issue.use_status_for_done_ratio?
  end

  # Returns an array of all statuses the given role can switch to
  def new_statuses_allowed_to(roles, tracker, author=false, assignee=false)
    self.class.new_statuses_allowed(self, roles, tracker, author, assignee)
  end
  alias :find_new_statuses_allowed_to :new_statuses_allowed_to

  def self.new_statuses_allowed(status, roles, tracker, author=false, assignee=false)
    if roles.present? && tracker
      status_id = status.try(:id) || 0

      scope = IssueStatus.
        joins(:workflow_transitions_as_new_status).
        where(:workflows => {:old_status_id => status_id, :role_id => roles.map(&:id), :tracker_id => tracker.id})

      unless author && assignee
        if author || assignee
          scope = scope.where("author = ? OR assignee = ?", author, assignee)
        else
          scope = scope.where("author = ? AND assignee = ?", false, false)
        end
      end

      scope.distinct.to_a.sort
    else
      []
    end
  end

  def <=>(status)
    position <=> status.position
  end

  def to_s; name end

  private

  # Updates issues closed_on attribute when an existing status is set as closed.
  def handle_is_closed_change
    if saved_change_to_is_closed? && is_closed == true
      # First we update issues that have a journal for when the current status was set,
      # a subselect is used to update all issues with a single query
      subquery = Journal.joins(:details).
        where(:journalized_type => 'Issue').
        where("journalized_id = #{Issue.table_name}.id").
        where(:journal_details => {:property => 'attr', :prop_key => 'status_id', :value => id.to_s}).
        select("MAX(created_on)").
        to_sql
      Issue.where(:status_id => id, :closed_on => nil).update_all("closed_on = (#{subquery})")

      # Then we update issues that don't have a journal which means the
      # current status was set on creation
      Issue.where(:status_id => id, :closed_on => nil).update_all("closed_on = created_on")
    end
  end

  def check_integrity
    if Issue.where(:status_id => id).any?
      raise "This status is used by some issues"
    elsif Tracker.where(:default_status_id => id).any?
      raise "This status is used as the default status by some trackers"
    end
  end

  # Deletes associated workflows
  def delete_workflow_rules
    WorkflowRule.where(:old_status_id => id).delete_all
    WorkflowRule.where(:new_status_id => id).delete_all
  end
end
