class Trace < ActiveRecord::Base
  set_table_name 'gpx_files'

  validates_presence_of :user_id, :name, :public, :timestamp
  validates_presence_of :description, :on => :create
#  validates_numericality_of :latitude, :longitude
  validates_inclusion_of :inserted, :in => [ true, false]
  
  belongs_to :user
  has_many :tags, :class_name => 'Tracetag', :foreign_key => 'gpx_id', :dependent => :delete_all
  has_many :points, :class_name => 'Tracepoint', :foreign_key => 'gpx_id', :dependent => :delete_all

  def destroy
    super
    FileUtils.rm_f(trace_name, icon_picture_name, large_picture_name)
  end

  def tagstring=(s)
    self.tags = s.split().collect {|tag|
      tt = Tracetag.new
      tt.tag = tag
      tt
    }
  end
  
  def large_picture= (data)
    f = File.new(large_picture_name, "wb")
    f.syswrite(data)
    f.close
  end
  
  def icon_picture= (data)
    f = File.new(icon_picture_name, "wb")
    f.syswrite(data)
    f.close
  end

  def large_picture
    f = File.new(large_picture_name, "rb")
    logger.info "large picture file: '#{f.path}', bytes: #{File.size(f.path)}"
    data = f.sysread(File.size(f.path))
    logger.info "have read data, bytes: '#{data.length}'"
    f.close
    data
  end
  
  def icon_picture
    f = File.new(icon_picture_name, "rb")
    logger.info "icon picture file: '#{f.path}'"
    data = f.sysread(File.size(f.path))
    f.close
    data
  end
  
  # FIXME change to permanent filestore area
  def large_picture_name
    "/home/osm/icons/#{id}.gif"
  end

  # FIXME change to permanent filestore area
  def icon_picture_name
    "/home/osm/icons/#{id}_icon.gif"
  end

  def trace_name
    "/home/osm/gpx/#{id}.gpx"
  end

  def to_xml_node
    el1 = XML::Node.new 'gpx_file'
    el1['id'] = self.id.to_s
    el1['name'] = self.name.to_s
    el1['lat'] = self.latitude.to_s
    el1['lon'] = self.longitude.to_s
    el1['user'] = self.user.display_name
    el1['public'] = self.public.to_s
    el1['pending'] = (!self.inserted).to_s
    el1['timestamp'] = self.timestamp.xmlschema
    return el1
  end

  def import
    begin
      logger.info("GPX Import importing #{name} (#{id}) from #{user.email}")

      # TODO *nix specific, could do to work on windows... would be functionally inferior though - check for '.gz'
      filetype = `file -b #{trace_name}`.chomp
      gzipped = filetype =~ /^gzip/
      zipped = filetype =~ /^Zip/

      if gzipped
        filename = tempfile = "/tmp/#{rand}"
        system("gunzip -c #{trace_name} > #{filename}")
      elsif zipped
        filename = tempfile = "/tmp/#{rand}"
        system("unzip -p #{trace_name} > #{filename}")
      else
        filename = trace_name
      end

      gpx = OSM::GPXImporter.new(filename)

      f_lat = 0
      f_lon = 0
      first = true

      Tracepoint.delete_all(['gpx_id = ?', self.id])

      gpx.points do |point|
        if first
          f_lat = point['latitude']
          f_lon = point['longitude']
        end

        tp = Tracepoint.new
        tp.lat = point['latitude'].to_f
        tp.lng = point['longitude'].to_f
        tp.altitude = point['altitude'].to_f
        tp.timestamp = point['timestamp']
        tp.user_id = user.id
        tp.gpx_id = id
        tp.trackid = point['segment'].to_i
        tp.save!
      end

      if gpx.actual_points > 0
        max_lat = Tracepoint.maximum('latitude', :conditions => ['gpx_id = ?', id])
        min_lat = Tracepoint.minimum('latitude', :conditions => ['gpx_id = ?', id])
        max_lon = Tracepoint.maximum('longitude', :conditions => ['gpx_id = ?', id])
        min_lon = Tracepoint.minimum('longitude', :conditions => ['gpx_id = ?', id])

        max_lat = max_lat.to_f / 1000000
        min_lat = min_lat.to_f / 1000000
        max_lon = max_lon.to_f / 1000000
        min_lon = min_lon.to_f / 1000000

        self.latitude = f_lat
        self.longitude = f_lon
        self.large_picture = gpx.get_picture(min_lat, min_lon, max_lat, max_lon, gpx.actual_points)
        self.icon_picture = gpx.get_icon(min_lat, min_lon, max_lat, max_lon)
        self.size = gpx.actual_points
        self.inserted = true
        self.save
      end

      logger.info "done trace #{id}"

      return gpx
    ensure
      FileUtils.rm_f(tempfile) if tempfile
    end
  end
end