module PeriodsHelper
  def remove_active_task(page)
    page.visual_effect :blind_up, "task_#{@task.id}"
    if @tasks.find {|t| t.backlog_id == @task.backlog_id}.nil?
      page["task_#{@task.id}"].ancestors.first.ancestors.first.remove
    else
      page.remove "task_#{@task.id}"
    end
    
    if @tasks.empty?
      page.visual_effect :blind_up, "active_tasks"
      page.visual_effect :appear, "no_tasks_message"
    end
  end
  
  def remove_finished_task(page)
    page.visual_effect :fade, "task_#{@task.id}"
    page.remove "task_#{@task.id}"
    
    if @last_finished
      page.select('#completed_tasks tr').first.remove
    end
  end
  
  def add_active_task(page)
    if @task.lower_item.nil? || @task.lower_item.backlog != @task.backlog
      page.insert_html :top, :active_tasks, '<table class="input" style="width: 100%;"/>'
    elsif @task.lower_item
      page.select('#active_tasks table tr').first.remove
      page.select('#active_tasks table tr').first.remove
    end
    
    insert(page, render(:partial => "/tasks/task", :locals => { :task => @task, :i => 1, :active => true, :highlight_task => false, :update => :spotlight, :hidden => true }), '#active_tasks table')
    
    fields_header = render(:partial => '/tasks/fields_header', :locals => { :backlog => @task.backlog, :active => true } )
    insert(page, fields_header, '#active_tasks table')
    insert(page, render(:partial => "/tasks/backlog_header", :locals => {:backlog => @task.backlog}), '#active_tasks table')
    
    page[:no_tasks_message].hide
    
    if @task.lower_item.nil?
      page.visual_effect :appear, "active_tasks"
    end
    page.visual_effect :appear, "task_#{@task.id}"
  end
  
  def add_finished_task(page)
    work_done = ! @completed_tasks.find {|t| t.total_done != 0}.nil?
    first_finished = @completed_tasks.find {|t| t.id != @task.id}.nil?
    unless first_finished
      page.select("#completed_tasks_#{@task.period_id} tr").first.remove
    else
      page.insert_html :top, "completed_tasks", "<table id=\"completed_tasks_#{@task.period_id}\" class=\"input\" />"
    end
    
    page.insert_html :top, "completed_tasks_#{@task.period_id}", :partial => '/tasks/task', :locals => {:active => false, :hidden => true, :highlight_task => false}
    page.visual_effect :appear, "task_#{@task.id}"
    
    page.insert_html :top, "completed_tasks_#{@task.period_id}", :partial => '/tasks/fields_header', :locals => {:backlog => @task.backlog, :active => false, :work_done => work_done}
  end
  
  def update_burn_down_chart(page)
    page['burn_down_chart'].src = url_for(:controller => 'periods', :action => :burn_down_chart_thumbnail, :id => @task.period.id, :rnd => rand)
  end
  
end