# -*- encoding : utf-8 -*-
# This file is part of Wiki UFC.
# Copyright (C) 2007-2015 by Álinson Xavier <isoron@gmail.com>
# Copyright (C) 2007-2008 by Adriano Freitas <adrianoblue@gmail.com>
# Copyright (C) 2007-2008 by André Castro <aisushin@gmail.com>
# Copyright (C) 2007-2008 by Rafael Barbosa <86.rafael@gmail.com>
# Copyright (C) 2007-2008 by Henrique Bustamante <bustamante.rique@gmail.com>
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU Affero General Public License as
# published by the Free Software Foundation, either version 3 of the
# License, or (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU Affero General Public License for more details.
#
# You should have received a copy of the GNU Affero General Public License
# along with this program.  If not, see <http://www.gnu.org/licenses/>.

class CoursesController < ApplicationController

  before_filter :require_admin, :only => [:new, :create, :edit, :update, :destroy]
  before_filter :require_login, :only => [:enroll, :unenroll]
  before_filter :find_course, :except => [:index]
  #after_filter :cache_sweep, :only => [ :create, :update, :destroy ]

  def index
    params[:period] = nil if params[:period] == App.current_period
    @period = params[:period] || App.current_period

    if logged_in? and !@current_user.courses.empty?
      @courses = Course.all(:order => 'grade asc, full_name asc',
          :conditions => ['period = ? and hidden = ? and id not in (?)',
              @period, false, @current_user.courses])
    else
      @courses = Course.all(:order => 'grade asc, full_name asc',
          :conditions => ['period = ? and hidden = ?', @period, false])
    end

    respond_to do |format|
      format.html
      format.xml { render :xml => @courses }
    end
  end

  def show
    respond_to do |format|
      format.html
      format.xml { render :xml => @course }
    end
  end

  def new
  end

  def create
    @course.save!
    flash[:notice] = t(:course_created)

    respond_to do |format|
      format.html { redirect_to course_path(@course) }
      format.xml { head :created, :location => course_url(@course,
              :format => :xml) }
    end
  end

  def edit
  end

  def update
    @course.attributes = params[:course]
    @course.save!

    flash[:notice] = t(:course_updated)
    respond_to do |format|
      format.html { redirect_to course_path(@course) }
      format.xml { head :ok }
    end
  end

  def destroy
    @course.destroy
    flash[:notice] = t(:course_removed)

    respond_to do |format|
      format.html { redirect_to courses_path }
      format.xml { head :ok }
    end
  end

  def enroll
    @current_user.courses << @course
    flash[:highlight] = @course.id

    respond_to do |format|
      format.html { redirect_to courses_path }
      format.xml { head :ok }
    end
  end

  def unenroll
    @current_user.courses.delete(@course)
    flash[:highlight] = @course.id

    respond_to do |format|
      format.html { redirect_to courses_path }
      format.xml { head :ok }
    end
  end

  protected
  def find_course
    if params[:id]
      params[:id] = Course.first(:conditions => ['short_name = ?', params[:id]], :order => 'period desc').id if !params[:id].is_numeric? and !Course.find_by_short_name(params[:id]).nil?
    end
    @course = params[:id] ? Course.find(params[:id]) : Course.new(params[:course])
  end

  def require_admin
    raise AccessDenied.new unless admin?
  end

  def cache_sweep
    expire_fragment(course_path(@course.id, :part => 'right'))
    expire_fragment(course_path(@course.id))
    expire_fragment(courses_path)
  end
end