class GcpController < ApplicationController
   layout 'application'
   before_filter :login_required, :except => [:show, :index]

   
   def show
      if Gcp.exists?(params[:id])
         @gcp = Gcp.find(params[:id])
         render :text => @gcp.inspect
      else
         render :text => "This ground control point does not exist anymore"
      end
   end


   def update
    @gcp = Gcp.find(params[:id])
    
    x = params[:x]
    y = params[:y]
    lon = params[:lon]
    lat = params[:lat]
    if @gcp.update_attributes(:x => x,:y => y, :lon => lon, :lat => lat)
      @map = @gcp.map
      @gcps = @map.gcps_with_error

      redirect_to_index unless request.xhr?
    else
      redirect_to_index("points couldnt be updated")
    end

  end

  def update_field
      @gcp = Gcp.find(params[:id])
      @map = @gcp.map
      attribute = params[:attribute]
      value = params[:value]

      if @gcp.update_attribute(attribute, value)
        # render :text => @gcp.send(attribute).to_s
        @map = @gcp.map
        @gcps = @map.gcps_with_error
        if request.xhr?
         render :action => 'update'
        else
         redirect_to_index
        end
 #       redirect_to_index unless request.xhr?
      else
         redirect_to_index("Control point couldnt be updated")
         # format.html { render :action => "edit" }
      end

   end

   def destroy
      @gcp = Gcp.find(params[:id])
      @map = @gcp.map
    
      @gcp.destroy
      @map.reload
      @gcps = @map.gcps_with_error
    
      redirect_to_index unless request.xhr?
   end


   def add
     #logger.info params.inspect
     x = params[:x] || 0
     y = params[:y] || 0
     lat = params[:lat] || 0
     lon = params[:lon] || 0
     id = params[:id]
     @gcp = Gcp.new(:map_id=>params[:id].to_i, :x=>x, :y=>y, :lat=>lat, :lon=>lon)

     @gcp.save! unless Gcp.exists?(:map_id=>params[:id].to_i, :x => 0, :y => 0, :lat => 0, :lon => 0) #dont save another blank row

     @map = @gcp.map
     @gcps = @map.gcps_with_error

     redirect_to_index unless request.xhr?
   end
   
   def index
   end

private
   #redirect helper method in case the request doesnt come from
   #ajax / prototype
   def redirect_to_index(msg = nil)
     flash[:notice] = msg if msg
     redirect_to :action => :index
   end
   
  end