class UserBlocksController < ApplicationController
  layout 'site'

  before_filter :authorize_web
  before_filter :set_locale
  before_filter :require_user, :only => [:new, :create, :edit, :update, :revoke]
  before_filter :require_moderator, :only => [:create, :update, :revoke]
  before_filter :lookup_this_user, :only => [:new, :create, :blocks_on, :blocks_by]
  before_filter :lookup_user_block, :only => [:show, :edit, :update, :revoke]
  before_filter :require_valid_params, :only => [:create, :update]
  before_filter :check_database_readable
  before_filter :check_database_writable, :only => [:create, :update, :revoke]

  def index
    @user_blocks_pages, @user_blocks = paginate(:user_blocks,
                                                :include => [:user, :creator, :revoker],
                                                :order => "user_blocks.ends_at DESC",
                                                :per_page => 20)
  end

  def show
    if @user and @user.id == @user_block.user_id
      @user_block.needs_view = false
      @user_block.save!
    end
  end

  def new
    @user_block = UserBlock.new
  end

  def edit
    params[:user_block_period] = ((@user_block.ends_at - Time.now.getutc) / 1.hour).ceil.to_s
  end

  def create
    unless @valid_params 
      redirect_to :action => "new"
      return
    end

    @user_block = UserBlock.new(:user_id => @this_user.id,
                                :creator_id => @user.id,
                                :reason => params[:user_block][:reason],
                                :ends_at => Time.now.getutc() + @block_period.hours,
                                :needs_view => params[:user_block][:needs_view])
    
    if @user_block.save
      flash[:notice] = t('user_block.create.flash', :name => @this_user.display_name)
      redirect_to @user_block
    else
      render :action => "new"
    end
  end

  def update  
    unless @valid_params 
      redirect_to :action => "edit"
      return
    end

    if @user_block.creator_id != @user.id
      flash[:error] = t('user_block.update.only_creator_can_edit')
      redirect_to :action => "edit"
      return
    end
      
    if @user_block.update_attributes({ :ends_at => Time.now.getutc() + @block_period.hours,
                                       :reason => params[:user_block][:reason],
                                       :needs_view => params[:user_block][:needs_view] })
      flash[:notice] = t('user_block.update.success')
      redirect_to(@user_block)
    else
      render :action => "edit"
    end
  end

  ##
  # revokes the block, setting the end_time to now
  def revoke
    if params[:confirm]
      if @user_block.revoke! @user
        flash[:notice] = t'user_block.revoke.flash'
        redirect_to(@user_block)
      end
    end
  end

  ##
  # shows a list of all the blocks on the given user
  def blocks_on
    @user_blocks_pages, @user_blocks = paginate(:user_blocks,
                                                :include => [:user, :creator, :revoker],
                                                :conditions => {:user_id => @this_user.id},
                                                :order => "user_blocks.ends_at DESC",
                                                :per_page => 20)
  end

  ##
  # shows a list of all the blocks by the given user.
  def blocks_by
    @user_blocks_pages, @user_blocks = paginate(:user_blocks,
                                                :include => [:user, :creator, :revoker],
                                                :conditions => {:creator_id => @this_user.id},
                                                :order => "user_blocks.ends_at DESC",
                                                :per_page => 20)
  end

  private
  ##
  # require that the user is a moderator, or fill out a helpful error message
  # and return them to the blocks index.
  def require_moderator
    unless @user.moderator?
      flash[:error] = t('user_block.filter.not_a_moderator')
      redirect_to :action => 'index'
    end
  end

  ##
  # ensure that there is a "this_user" instance variable
  def lookup_this_user
    @this_user = User.find_by_display_name(params[:display_name])
  rescue ActiveRecord::RecordNotFound
    redirect_to :controller => 'user', :action => 'view', :display_name => params[:display_name] unless @this_user
  end

  ##
  # ensure that there is a "user_block" instance variable
  def lookup_user_block
    @user_block = UserBlock.find(params[:id])
  rescue ActiveRecord::RecordNotFound
    render :action => "not_found", :status => :not_found
  end

  ##
  # check that the input parameters are valid, setting an instance
  # variable if not. note that this doesn't do any redirection, as it's
  # called before two different actions, each of which should redirect
  # to a different place.
  def require_valid_params
    @block_period = params[:user_block_period].to_i
    @valid_params = false

    if !UserBlock::PERIODS.include?(@block_period)
      flash[:error] = t('user_block.filter.block_period')
      
    elsif @user_block and !@user_block.active?
      flash[:error] = t('user_block.filter.block_expired')
      
    else
      @valid_params = true
    end
  end

end