class WayController < ApplicationController
  require 'xml/libxml'

  session :off
  before_filter :authorize, :only => [:create, :update, :delete]
  before_filter :check_write_availability, :only => [:create, :update, :delete]
  before_filter :check_read_availability, :except => [:create, :update, :delete]
  after_filter :compress_output

  def create
    if request.put?
      way = Way.from_xml(request.raw_post, true)

      if way
        if !way.preconditions_ok?
          render :text => "", :status => :precondition_failed
        else
          way.version = 0
          way.user_id = @user.id
          way.save_with_history!

          render :text => way.id.to_s, :content_type => "text/plain"
        end
      else
        render :nothing => true, :status => :bad_request
      end
    else
      render :nothing => true, :status => :method_not_allowed
    end
  end

  def read
    begin
      way = Way.find(params[:id])

      response.headers['Last-Modified'] = way.timestamp.rfc822

      if way.visible
        render :text => way.to_xml.to_s, :content_type => "text/xml"
      else
        render :text => "", :status => :gone
      end
    rescue ActiveRecord::RecordNotFound
      render :nothing => true, :status => :not_found
    end
  end

  def update
    begin
      way = Way.find(params[:id])
      new_way = Way.from_xml(request.raw_post)

      if new_way and new_way.id == way.id
        way.update_from(new_way, @user)
        render :text => way.version.to_s, :content_type => "text/plain"
      else
        render :nothing => true, :status => :bad_request
      end
    rescue OSM::APIPreconditionFailedError
      render :text => "", :status => :precondition_failed
    rescue OSM::APIVersionMismatchError => ex
      render :text => "Version mismatch: Provided " + ex.provided.to_s +
	", server had: " + ex.latest.to_s, :status => :bad_request
    rescue ActiveRecord::RecordNotFound
      render :nothing => true, :status => :not_found
    end
  end

  # This is the API call to delete a way
  def delete
    begin
      way = Way.find(params[:id])
      way.delete_with_history(@user)

      # if we get here, all is fine, otherwise something will catch below.  
      render :nothing => true
    rescue OSM::APIAlreadyDeletedError
      render :text => "", :status => :gone
    rescue OSM::APIPreconditionFailedError
      render :text => "", :status => :precondition_failed
    rescue ActiveRecord::RecordNotFound
      render :nothing => true, :status => :not_found
    end
  end

  def full
    begin
      way = Way.find(params[:id])

      if way.visible
        nd_ids = way.nds + [-1]
        nodes = Node.find(:all, :conditions => "visible = 1 AND id IN (#{nd_ids.join(',')})")

        # Render
        doc = OSM::API.new.get_xml_doc
        nodes.each do |node|
          doc.root << node.to_xml_node()
        end
        doc.root << way.to_xml_node()

        render :text => doc.to_s, :content_type => "text/xml"
      else
        render :text => "", :status => :gone
      end
    rescue ActiveRecord::RecordNotFound
      render :nothing => true, :status => :not_found
    end
  end

  def ways
    begin
      ids = params['ways'].split(',').collect { |w| w.to_i }
    rescue
      ids = []
    end

    if ids.length > 0
      doc = OSM::API.new.get_xml_doc

      Way.find(ids).each do |way|
        doc.root << way.to_xml_node
      end

      render :text => doc.to_s, :content_type => "text/xml"
    else
      render :nothing => true, :status => :bad_request
    end
  end

  def ways_for_node
    wayids = WayNode.find(:all, :conditions => ['node_id = ?', params[:id]]).collect { |ws| ws.id[0] }.uniq

    doc = OSM::API.new.get_xml_doc

    Way.find(wayids).each do |way|
      doc.root << way.to_xml_node
    end

    render :text => doc.to_s, :content_type => "text/xml"
  end
end