require 'date'

class Task < Issue
  unloadable

  def self.tracker
    task_tracker = Setting.plugin_redmine_backlogs[:task_tracker]
    task_tracker.blank? ? nil : task_tracker.to_i
  end

  def self.create_with_relationships(params, user_id, project_id)
    task = new

    task.author_id  = user_id
    task.project_id = project_id
    task.tracker_id = Task.tracker

    task.safe_attributes = params
    task.remaining_hours = 0 if IssueStatus.find(params[:status_id]).is_closed?

    if task.save
      task.move_after params[:prev]
    end

    return task
  end

  # TODO: there's an assumption here that impediments always have the
  # task-tracker as their tracker.
  def self.find_all_updated_since(since, project_id, find_impediments = false)
    find(:all,
         :conditions => ["project_id = ? AND updated_on > ? AND tracker_id in (?) and parent_id IS #{ find_impediments ? '' : 'NOT' } NULL", project_id, Time.parse(since), tracker],
         :order => "updated_on ASC")
  end

  def self.tasks_for(story_id)
    tasks = []
    Story.find_by_id(story_id).children.
      find_all_by_tracker_id(Task.tracker, :order => :lft).each_with_index {|task, i|
        task.rank = i + 1
        tasks << task
      }
    return tasks
  end

  def impediment?
    parent_issue_id.nil?
  end

  def update_with_relationships(params, is_impediment = false)
    attribs = params.clone.delete_if { |k, v| !safe_attribute_names.include?(k) }

    attribs[:remaining_hours] = 0 if IssueStatus.find(params[:status_id]).is_closed?

    result = journalized_update_attributes!(attribs)

    move_after params[:prev] if result

    result
  end

  # assumes the task is already under the same story as 'id'
  def move_after(id)
    id = nil if id.respond_to?('blank?') && id.blank?
    if id.nil?
      sib = self.siblings
      move_to_left_of sib[0].id if sib.any?
    else
      move_to_right_of id
    end
  end

  def rank=(r)
    @rank = r
  end

  def rank
    @rank ||= Issue.count(:conditions => ['tracker_id = ? and not parent_id is NULL and root_id = ? and lft <= ?', Task.tracker, story_id, self.lft])
    return @rank
  end
end