class TasksController < ApplicationController

  before_filter :authenticate, :check_viewability

  def index
    redirect_to :action => 'list'
  end

  def list
    @problems = Problem.find_available_problems
    @user = User.find(session[:user_id])
  end

  def view
    base_filename = File.basename("#{params[:file]}.#{params[:ext]}")
    filename = "#{RAILS_ROOT}/data/tasks/#{base_filename}"
    if !FileTest.exists?(filename)
      redirect_to :action => 'index' and return
    end
    # ask Apache to send the file --- doesn't quite work...
    #response.headers['Content-Type'] = "application/force-download" 
    #response.headers['Content-Disposition'] = "attachment; filename=\"#{File.basename(filename)}\"" 
    #response.headers['Content-length'] = File.size(filename)
    #response.headers['X-Sendfile'] = filename
    #render :nothing => true

    send_file filename, :stream => false, :filename => base_filename
  end

  protected

  def check_viewability
    user = User.find(session[:user_id])
    if user==nil or !Configuration.show_tasks_to?(user)
      redirect_to :controller => 'main', :action => 'list'
      return false
    end
  end

end