module BacklogsHelper
  def remove_active_task(page)
    page.visual_effect :blind_up, "task_#{@task.id}"
    if not @tasks.find {|t| t.period_id == @task.period_id}
      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 add_finished_task(page)
    tasks_in_period = @completed_tasks.select {|t| t.period_id == @task.period_id}
    work_done = ! tasks_in_period.find {|t| t.total_done != 0}.nil?
    not_first = tasks_in_period.size > 1
    if not_first
      page.select("#completed_tasks_#{@task.period_id} tr").first.remove
      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}
    page.insert_html :top, "completed_tasks_#{@task.period_id}", :partial => '/tasks/period_header', :locals => {:period => @task.period}
  end

  def remove_finished_task(page)
    page.visual_effect :fade, "task_#{@task.id}"
    page.remove "task_#{@task.id}"
    
    unless @completed_tasks.find {|t| t.period_id == @task.period_id}
      page["completed_tasks_#{@task.period_id}"].remove
    end
  end
  
  def add_active_task(page)
    tasks_in_period = @tasks.select{|t| t.period_id == @task.period_id}
    first_in_period = tasks_in_period.size == 1
    if first_in_period
      page.insert_html :top, :active_tasks, %Q{<table id="active_tasks_#{@task.period_id}" class="input" style="width: 100%;"/>}
    else
      page.select("#active_tasks_#{@task.period_id} tr").first.remove
      page.select("#active_tasks_#{@task.period_id} tr").first.remove
    end
    
    page.insert_html(:top, "active_tasks_#{@task.period_id}", render(:partial => "/tasks/task", :locals => { :task => @task, :i => 1, :active => true, :highlight_task => false, :update => :spotlight, :hidden => true }))
    
    fields_header = render(:partial => '/tasks/fields_header', :locals => { :backlog => @task.backlog, :active => true, :track_times => tasks_in_period.find {|t|t.period && t.period.active?} } )
    page.insert_html :top, "active_tasks_#{@task.period_id}", fields_header
    page.insert_html :top, "active_tasks_#{@task.period_id}", render(:partial => "/tasks/period_header", :locals => {:period => @task.period})
    
    page[:no_tasks_message].hide
    
    if @tasks.size == 1
      page.visual_effect :appear, "active_tasks"
    end
    page.visual_effect :appear, "task_#{@task.id}"
  end
  
end