#--
# Copyright (c) 2010-2011 Michael Berkovich
#
# Permission is hereby granted, free of charge, to any person obtaining
# a copy of this software and associated documentation files (the
# "Software"), to deal in the Software without restriction, including
# without limitation the rights to use, copy, modify, merge, publish,
# distribute, sublicense, and/or sell copies of the Software, and to
# permit persons to whom the Software is furnished to do so, subject to
# the following conditions:
#
# The above copyright notice and this permission notice shall be
# included in all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
# EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
# MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
# NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
# LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
# OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
# WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
#++

class Tr8n::BaseController < ApplicationController

  layout Tr8n::Config.site_info[:tr8n_layout]

  if Tr8n::Config.tr8n_helpers.any?
    helper *Tr8n::Config.tr8n_helpers
  end

  if Tr8n::Config.skip_before_filters.any?
    skip_before_filter *Tr8n::Config.skip_before_filters
  end

  if Tr8n::Config.before_filters.any?
    before_filter *Tr8n::Config.before_filters
  end
  
  if Tr8n::Config.after_filters.any?
    after_filter *Tr8n::Config.after_filters
  end
  
  before_filter :validate_tr8n_enabled, :except => [:translate]
  before_filter :validate_guest_user, :except => [:select, :switch, :translate, :table]
  before_filter :validate_current_user, :except => [:translate]
  
  layout Tr8n::Config.site_info[:tr8n_layout]

  def tr8n_current_user
    Tr8n::Config.current_user
  end
  helper_method :tr8n_current_user

  def tr8n_current_language
    Tr8n::Config.current_language
  end
  helper_method :tr8n_current_language

  def tr8n_default_language
    Tr8n::Config.default_language
  end
  helper_method :tr8n_default_language

  def tr8n_current_translator
    Tr8n::Config.current_translator
  end
  helper_method :tr8n_current_translator
  
  def tr8n_current_user_is_admin?
    Tr8n::Config.current_user_is_admin?
  end
  helper_method :tr8n_current_user_is_admin?
  
  def tr8n_current_user_is_translator?
    Tr8n::Config.current_user_is_translator?
  end
  helper_method :tr8n_current_user_is_translator?

  def tr8n_current_user_is_manager?
    return false unless Tr8n::Config.current_user_is_translator?
    tr8n_current_translator.manager?
  end
  helper_method :tr8n_current_user_is_manager?
  
  def tr8n_current_user_is_guest?
    Tr8n::Config.current_user_is_guest?
  end
  helper_method :tr8n_current_user_is_guest?
  
private
  
  def tr8n_features_tabs
    @tabs ||= begin 
      tabs = Tr8n::Config.features.clone
      unless Tr8n::Config.multiple_base_languages?
        tabs = tabs.select{|tab| tab[:default_language]} if tr8n_current_language.default?
      end
    
      unless tr8n_current_user_is_translator? and tr8n_current_translator.manager?
        tabs = tabs.select{|tab| !tab[:manager_only]}  
      end
      tabs
    end
  end
  helper_method :tr8n_features_tabs

  def redirect_to_source
    return redirect_to(params[:source_url]) unless params[:source_url].blank?
    return redirect_to(request.env['HTTP_REFERER']) unless request.env['HTTP_REFERER'].blank?
    redirect_to_site_default_url
  end

  def redirect_to_site_default_url
    redirect_to(Tr8n::Config.default_url)
  end

  def page
    params[:page] || 1
  end
  
  def per_page
    params[:per_page] || 30
  end
  
  def sanitize_label(label)
#  do not double escape    
#  CGI::escapeHTML(label.strip)
   ERB::Util.html_escape(label.strip)
  end

  # handle disabled state for tr8n
  def validate_tr8n_enabled
    if Tr8n::Config.disabled?
      trfe("You don't have rights to access that section.")
      return redirect_to(Tr8n::Config.default_url)
    end
  end

  # guest users can still switch between languages outside of the site
  def validate_guest_user
    if tr8n_current_user_is_guest?
      trfe("You must be a registered user in order to access this section of the site.")
      return redirect_to(Tr8n::Config.default_url)
    end
  end

  # make sure users have the rights to access this section
  def validate_current_user
    unless Tr8n::Config.open_registration_mode? or Tr8n::Config.current_user_is_translator? 
      trfe("You don't have rights to access that section.")
      return redirect_to(Tr8n::Config.default_url)
    end
  end

  # make sure that the current user is a translator
  def validate_current_translator
    if tr8n_current_user_is_translator? and tr8n_current_translator.blocked?
      trfe("Your translation privileges have been revoked. Please contact the site administrator for more details.")
      return redirect_to(Tr8n::Config.default_url)
    end
  end

  # make sure that the current user is a language manager
  def validate_language_management
    # admins can do everything
    return if tr8n_current_user_is_admin?
    
    if tr8n_current_language.default?
      trfe("Only administrators can modify this language")
      return redirect_to(@tabs.first[:link])
    end

    unless tr8n_current_user_is_translator? and tr8n_current_translator.manager? 
      trfe("In order to manage a language you first must request to become a manager of that language. Please send your request to Geni support.")
      return redirect_to(@tabs.first[:link])
    end
  end
  
  def validate_default_language
    return if Tr8n::Config.multiple_base_languages?
    redirect_to(tr8n_features_tabs.first[:link]) if tr8n_current_language.default?
  end
  
  def validate_language
    return unless params[:language]
    return if params[:language][:fallback_language_id].blank? # default
    
    fallback_language = Tr8n::Language.find(params[:language][:fallback_language_id])
    
    while fallback_language do
      if fallback_language == tr8n_current_language
        return "You are creating an infinite loop with fallback languages. Please ensure that languages do not fall back onto each other."
      end
      fallback_language = fallback_language.fallback_language
    end
  end
    
  def validate_admin
    unless tr8n_current_user_is_admin?
      trfe("You must be an admin in order to view this section of the site")
      redirect_to_site_default_url
    end
  end
  
end