import joms.oms.Init
import joms.oms.Mosaic
import joms.oms.Video
import joms.oms.Util
import joms.oms.SingleImageChain
import joms.oms.ossimFilename
import joms.oms.ossimString
import joms.oms.ossimIrect
import joms.oms.ossimProjection
import joms.oms.ossimScalarType
import joms.oms.ossimImageHandler
import joms.oms.ossimImageHandlerRegistry
import joms.oms.ossimImageWriterFactoryRegistry
import org.ossim.oms.image.omsRenderedImage;
import org.ossim.oms.image.omsImageSource;
import joms.oms.ossimImageViewAffineTransform

class ThumbnailService
{

  boolean transactional = true
  static def synchVar = 0
  static
  {
    synchronized ( ThumbnailService.synchVar )
    {
      Init.instance().initialize()
    }
  }

  def getThumbnail(String cacheDirPath, String thumbnailPrefix, int size, String mimeType,
                   String inputFilename, String entryId, String projectionType)
  {
    def outputFile = new File(
        cacheDirPath,
        "${thumbnailPrefix}.jpg"
    )

    def outputFileTemp = new File(
        cacheDirPath,
        "${thumbnailPrefix}.jpg.tmp"
    )

    def histogramStretchType = "linear_auto_min_max"

    // for now we only support imagespace thumbnails
    //
    if ( projectionType != "imagespace" )
    {
      projectionType = "imagespace"
    }

    // need to synchronize file creation for people hitting the server same time for the same request
    //
//    synchronized ( synchVar )
//    {
      if ( !outputFile.exists() )
      {
        def stretchTypeToUse = histogramStretchType
        if ( ThumbnailGenerator.writeImageSpaceThumbnail(inputFilename,
            entryId,
            outputFileTemp as String,
            mimeType,
            size, size,
            "", // use default
            stretchTypeToUse, true) )
        {
          if ( outputFileTemp.exists() )
          {
            outputFileTemp.renameTo(outputFile);
          }
        }
      }
//    }
    return outputFile
  }

  def getFrame(String cacheDirPath, String thumbnailPrefix, int size, String inputFilename)
  {
    Video video = new Video()

    def outputFile = new File(cacheDirPath, "${thumbnailPrefix}.jpg")


    if ( !outputFile.exists() )
    {
      if ( video.open(inputFilename) )
      {
        video.nextFrame();
        video.writeCurrentFrameToFile(outputFile.absolutePath, size);
      }
    }

    return outputFile
  }
}