Scirpt that reads in json file and puts text over image and creates thumbnail

create_text_over_images.jsx

#target photoshop
//#include "json2.js" // jshint ignore:line
//Using this file https://github.com/douglascrockford/JSON-js/blob/master/json2.js
//Had to download and install it


main();
var base_dir = ""

function main() {
    var initialPrefs = app.preferences.rulerUnits; // will restore at end
    app.preferences.rulerUnits = Units.PIXELS;     // use pixels

    var thumbnailFile = app.activeDocument.path + "/thumbnail.png"
    var thumbnailFileFull = app.activeDocument.path + "/thumbnail_FULL.png"
    var text_rules_file = app.activeDocument.path  + "/image_text.json"
    //Base Dir used by saveTxt
    base_dir = app.activeDocument.path
    //Get the img_text.json file located in same dir
    text_json = getJSONFromFile(base_dir +"/img_text.json")



    //Make a copy
    var docCopy = app.activeDocument.duplicate();

    var sfw = new ExportOptionsSaveForWeb();
    sfw.format = SaveDocumentType.PNG;
    sfw.PNG8 = false; // use PNG-24
    sfw.transparency = true;

    var goForIt = confirm("This will make a thumbnail\n" + thumbnailFile + "\n\nWith text defined in the " + text_rules_file + " File");

    try {
        if (goForIt) {
            for(x=0; x< text_json.length; x++){
              //alert( text_json[x]["text"] );
              drawTextLayer(docCopy,
                              text_json[x]["text"],
                              text_json[x]["font"],
                              text_json[x]["font-size"],
                              text_json[x]["pos"],
                              text_json[x]["rotate"],
                           )
            }
            //Save the Updated file as png
            docCopy.exportDocument(new File(thumbnailFileFull), ExportType.SAVEFORWEB, sfw);
            //resize to small Twitter size 360 x
            docCopy.resizeImage(UnitValue(360, "px"), null, null, ResampleMethod.BICUBIC);
            docCopy.exportDocument(new File(thumbnailFile), ExportType.SAVEFORWEB, sfw);
        }
    }
    catch(exception) {
        confirm("ERROR: " + exception)
    }
    finally{
        app.preferences.rulerUnits = initialPrefs; // restore prefs
        if(docCopy != null){
            docCopy.close(SaveOptions.DONOTSAVECHANGES);
        }
    }

}

//Function for drawing Text on layer
function drawTextLayer(doc, txt, font, fontSize, pos, rotate){
  createTextLayer(txt, font, fontSize, pos, rotate)
  magicWand(1,1)
  textSelection = activeDocument.selection
  textSelection.invert()
  textSelection.expand(10)
  createLayerBelowCurrent("The Layer Below");
  var myColor = new SolidColor();
  myColor.rgb.hexValue = "000000"
  textSelection.fill(myColor);


  //For testing purposes write out all fonts
  //writeAllFontsToFile();
}

function createTextLayer(txt, font, fontSize, pos, rotate) {
    var startRulerUnits = app.preferences.rulerUnits;
    app.preferences.rulerUnits = Units.PIXELS;
    var thisLayer = activeDocument.artLayers.add();
    thisLayer.kind = LayerKind.TEXT;
    thisLayer.name = txt;
    var textProperty = thisLayer.textItem;
    textProperty.kind = TextType.POINTTEXT; //POINTTEXT does not wrap but PARAGRAPHTEXT does
    //Font Size
    textProperty.size = fontSize;
    //textProperty.font = "Orbitron Black";
    textProperty.font = font;
    var newColor = new SolidColor();
    //Font Colour
    newColor.rgb.hexValue = "ffffff"
    textProperty.color = newColor;
    thisLayer.blendMode = BlendMode.NORMAL;
    thisLayer.opacity = 100;
    textProperty.contents = txt; //In text user /r for carriage return /n does not work
    textProperty.position = pos;
    app.preferences.rulerUnits=startRulerUnits;

    thisLayer.rotate(rotate)
}

function saveTxt(fileName, txt)
{
    var saveFile = File(base_dir + "/" + fileName);

    if(saveFile.exists)
        saveFile.remove();

    saveFile.encoding = "UTF8";
    saveFile.open("e", "TEXT", "????");
    saveFile.writeln(txt);
    saveFile.close();
}

//For testing purposes write all font names and
//All postscript font names to file
//postscriptName is what is needed to set font for layer
function writeAllFontsToFile(){
  all_fonts = ""
  for(var x = 0; x < app.fonts.length; x++){
    all_fonts += app.fonts[x].name + "::" + app.fonts[x].postScriptName + "\n"
  }
  saveTxt("fontfile.txt", all_fonts);
}

function magicWand(x,y,t,a,c,s) {
    if(arguments.length < 2) return;// make sure have x,y
    if(undefined == t) var t = 32;// set defaults of optional arguments
    if(undefined == a) var a = true;
    if(undefined == c) var c = false;
    if(undefined == s) var s = false;
    var desc = new ActionDescriptor();
        var ref = new ActionReference();
        ref.putProperty( charIDToTypeID('Chnl'), charIDToTypeID('fsel') );
    desc.putReference( charIDToTypeID('null'), ref );
        var positionDesc = new ActionDescriptor();
        positionDesc.putUnitDouble( charIDToTypeID('Hrzn'), charIDToTypeID('#Rlt'), x );// in pixels
        positionDesc.putUnitDouble( charIDToTypeID('Vrtc'), charIDToTypeID('#Rlt'), y );
    desc.putObject( charIDToTypeID('T   '), charIDToTypeID('Pnt '), positionDesc );
    desc.putInteger( charIDToTypeID('Tlrn'), t);// tolerance
    desc.putBoolean( charIDToTypeID('Mrgd'), s );// sample all layers
    if(!c) desc.putBoolean( charIDToTypeID( "Cntg" ), false );//  contiguous
    desc.putBoolean( charIDToTypeID('AntA'), a );// anti-alias
    executeAction( charIDToTypeID('setd'), desc, DialogModes.NO );
};

function createLayerBelowCurrent(astring)
{
  var currentActivelayer = app.activeDocument.activeLayer;
  var idx = getLayerIndex(currentActivelayer);

  // Get a reference to the active layer
  var layerRef = app.activeDocument.layers[idx];

  // Create a new Art Layer, by default at the top of the document
  var newLayerRef = app.activeDocument.artLayers.add();

  // Move the new layer set to after the previously first layer
  newLayerRef.move(layerRef, ElementPlacement.PLACEAFTER);
}
function getLayerIndex(ref)
{
  // return the idex of ALL layers
  var numOfLayers = app.activeDocument.layers.length;

  // work from the top of the stack down!
  for (var i = numOfLayers -1; i >= 0; i--)
  {
    var tempLayer = app.activeDocument.layers[i];
    if (tempLayer == ref) return i

    if (tempLayer.typename == "LayerSet")
    {
      var subDoc = app.activeDocument.layers[i];
      for (var j = numOfSubLayers -1; j >= 0; j--)
      {
        var tempSubLayer = subDoc.layers[j]
        if (tempSubLayer == ref) return j
      }
    }
  }
}

function getJSONFromFile(jsonFile){
  var jsonFile = File(jsonFile)
  jsonFile.encoding = 'UTF8'; // set to 'UTF8' or 'UTF-8'
  jsonFile.open("r");
  var fileContentsString = jsonFile.read();
  jsonFile.close();

  return eval(fileContentsString)
}