// Jim Elder, Ottawa, Canada
// see script reference guide in Program Files/Adobe...

// Save the current preferences
var startDisplayDialogs = app.displayDialogs;
// Set Adobe Photoshop CS2 to use pixels and display no dialogs
app.displayDialogs = DialogModes.NO;
// ask the user for the input folder
alert ("Edit the script to set your input and output directories, then delete this");
var inputFolder = new Folder("~/Videos/TimeLapse/psScripts");
var outputFolder = new Folder("~/Videos/TimeLapse/psScripts/output");
if (false) {
  // there is some problem with these -- the first one seems to execute twice -- so
  // it's been hard-code above
  inputFolder =
      new Folder.selectDialog("What folder contains the input images and clock.psd?"); 
  outputFolder = new Folder.selectDialog("To what folder do you want the output written?") 
}
// see if we got something interesting from the dialog
if (inputFolder == null && outputFolder != null)
  alert ("Can't run without input and output folders")
else {
  var clockRef = open(new File(inputFolder.path & "\clock.psd"));
  // get all the JPG files found in this folder
  var fileList = inputFolder.getFiles("*.jpg");
  // save the outputs in JPEG
  var jpegOptions = new JPEGSaveOptions();
  jpegOptions.quality = 10;
  // open each one in turn
  var startTime = 0;
  for (var i = 0; i < fileList.length; i++) {
    // The fileList includes both folders and files so open only files
    if (fileList[i] instanceof File && fileList[i].hidden == false &&
        (fileList[i].name.toLowerCase().indexOf(".jpg") > 0)) {
      // get a reference to the new document
      var docRef = open(fileList[i]);
      var exif = docRef.info.exif;
      var dateEntry = exif[6];
      var ds = dateEntry[1];   // 2008:01:28 14:02:11  0 5 8 11 14 17
      var createDate = new Date(parseInt(ds.substring(0,4)),
          parseInt(ds.substring(5,7)) -1, parseInt(ds.substring(8,10)),
          parseInt(ds.substring(11,13)), parseInt(ds.substring(14,17)),
      parseInt(ds.substring(17,19)));
      if (startTime == 0)
        startTime = createDate.getTime();
      var offsetSeconds = (createDate.getTime() - startTime) / 1000; 
      app.activeDocument = clockRef;
      // Set hour hand
      var hourHand = clockRef.layers.getByName("hourHand");
      clockRef.activeLayer = hourHand;
      clockRef.activeLayer = clockRef.activeLayer.duplicate();
      clockRef.selection.selectAll();
      clockRef.selection.rotate((offsetSeconds / 120) % 360);
      // Set minute hand
      var minuteHand = clockRef.layers.getByName("minuteHand");
      clockRef.activeLayer = minuteHand;
      clockRef.activeLayer = clockRef.activeLayer.duplicate();
      clockRef.selection.selectAll();
      clockRef.selection.rotate((offsetSeconds % 3600) / 10);
      // Copy clock to clipboard
      minuteHand.visible = false;
      hourHand.visible = false;
      clockRef.selection.selectAll();
      clockRef.selection.copy(true);
      // Clean up clock
      clockRef.layers.getByName("minuteHand copy").remove();
      clockRef.layers.getByName("hourHand copy").remove();
      // Paste clock to target doc
      app.activeDocument = docRef;
      docRef.paste();
      docRef.activeLayer.translate((docRef.width - clockRef.width - 25) -
          docRef.activeLayer.bounds[0], (docRef.height - clockRef.height - 25) -
          docRef.activeLayer.bounds[1]);
      docRef.flatten();
      // save and close
      docRef.saveAs(new File(outputFolder + "/" + fileList[i].name), jpegOptions)
      // do not modify the original
      docRef.close(SaveOptions.DONOTSAVECHANGES)
    }
  }
}
clockRef.close(SaveOptions.DONOTSAVECHANGES);
// Reset the application preferences
app.displayDialogs = startDisplayDialogs;