class PeriodsController < ApplicationController
  skip_before_filter :populate_layout, :only => [:index, :show_no_layout, :destroy, :burn_down_chart_thumbnail, :burn_down_chart]
  skip_before_filter :authenticate_user, :only => [:burn_down_chart, :burn_down_chart_thumbnail, :burn_down_chart_large]
  
  def index
    active_periods = Period.find(:all).select {|period| period.active?(true)}
    my_active_periods = active_periods.select {|period| period.party.includes?(current_user)}
    unless my_active_periods.empty?
      most_urgent_period = my_active_periods.sort_by {|p| p.required_speed}.last
    else
      most_urgent_period = active_periods.sort_by {|p| p.required_speed}.last
    end
    redirect_to :action => 'show', :id => most_urgent_period
  end
  
  # GETs should be safe (see http://www.w3.org/2001/tag/doc/whenToUseGet.html)
  verify :method => :post, :only => [ :destroy, :create, :update ], :redirect_to => { :action => :index }
  
  def show
    if params[:task_id]
      @selected_task = Task.find(params[:task_id])
    end
    if @selected_task
      @period = @selected_task.period
    elsif params[:id] && @period = Period.find_by_id(params[:id])
    elsif @period = Period.find(:first)
    else
      redirect_to :action => :new
      return
    end
    if @selected_task.nil?
      @selected_task = Task.find(:first, :conditions => "position = 1 AND period_id = #{@period.id}")
    end
    @tasks = @period.open_tasks
    @completed_tasks = @period.completed_tasks.reverse
  end
  
  def show_no_layout
    show
    render :partial => 'show_active', :layout => false, :locals => {:i => 0}
  end
  
  def new
    @period = Period.new
    if params[:period] && params[:period][:party_id]
      @period.party_id = params[:period][:party_id]
      previous = @period.party.periods.last
      if previous
        @period.start_on = previous.end_on + 1
        @period.end_on = previous.end_on + (1 + (previous.end_on - previous.start_on))
      else
        @period.start_on = Date.today
      end
    end
    @parties = Party.find(:all)
  end
  
  def create
    @period = Period.new(params[:period])
    if @period.save
      @period.reload
      flash[:notice] = 'Period was successfully created.'
      back_or_redirect_to :action => 'show', :id => @period.higher_item ? @period.higher_item : @period
    else
      render :action => 'new'
    end
  end
  
  def edit
    @period = Period.find(params[:id])
  end
  
  def update
    @period = Period.find(params[:id])
    if @period.update_attributes(params[:period])
      flash[:notice] = 'Period was successfully updated.'
      redirect_to :action => 'show', :id => @period
    else
      render :action => 'edit'
    end
  end
  
  def destroy
    Period.find(params[:id]).destroy
    flash[:notice] = 'Period was successfully deleted.'
    redirect_to :action => 'index'
  end
  
  def burn_down_chart_thumbnail
    send_burn_down_chart Chart::THUMBNAIL
  end
  
  def burn_down_chart
    send_burn_down_chart Chart::NORMAL
  end
  
  def burn_down_chart_large
    send_burn_down_chart Chart::LARGE
  end
  
  def list_work
    @period = Period.find(params[:id])
    @works = Work.find_by_sql("SELECT w.* FROM works w LEFT OUTER JOIN tasks t ON t.id = w.task_id WHERE t.period_id = #{@period.id} ORDER BY w.completed_at")
    render :template => '/works/list'
  end

  def make_link
    if params[:id].to_i > 0
      render :partial => 'link', :layout => false, :locals => {:period => Period.find(params[:id])}
    else
      render :text => ''
    end
  end
  
  private
  
  def send_burn_down_chart(size)
    period = Period.find(params[:id])
    g = period.burn_down_graph(size)
    send_data(g, :disposition => 'inline', :type => 'image/png', :filename => "burn_down_chart.png")
  end
  
end