/**
* _ExportImages - for more information please visit: http://journal.reallyenglish.com/2010/01/30/batch-image-exporting-from-fla.html
*
* Running this command will;
* Export .png images from each frames in the current timeline (with the currenrt .png export settings).
* USE THIS COMMAND AT YOUR OWN LISK - it is strongly recommended that you test this command on copies of your files first.
*/

var log = "";
var logURI = "";
var dirURI = "";

(function(){
  try{
    dirURI = selectDir(); // dirURI must be set before doing anything

    if(!dirURI) throw new Error("Directory URI is not specified.");
    
    initLog();
  
  	var fileNames = FLfile.listFolder(dirURI + "*.fla", "files");
  	if(!fileNames || !fileNames.length) throw new Error("There are no .flas in the selected directory.");
  	
  	appendLog("*** Files to process: ***\n" + fileNames.join("\n") + "\n");
	
  	var cnt = fileNames.length;
  	for(var i=0; i<cnt; i++){
  	  var fileName = fileNames[i];
  	  processFla(fileName);
  	}
  	
  	flushLog(); 
	}catch(err){
	  alert("Error: " + err.message + "\nOperation aborted in midstream.");
	}
})();

function selectDir(){
  var retDirURI = null
  retDirURI = appendSlash(fl.browseForFolderURL("Choose a folder where your target .fla files are located."));
  return retDirURI;
}

function processFla(fileName) {
  appendLog("*** Processing " + fileName + " ***");
  
	var fileURI = dirURI + fileName;
	var doc = fl.openDocument(fileURI);
	
	processDoc(doc, fileName);
	
	appendLog("\n");
}

function initLog(){
  log = "";
  logURI = dirURI + "log.txt";
	FLfile.write(logURI, "");
}

function appendLog(str) {
	log += "\n"+ str;
	fl.trace(str);
}

function flushLog(){
  if(logURI){
    FLfile.write(logURI, log, "append");
    fl.openScript(logURI);
  }
}

function appendSlash(str){
  return (str.substr(-1) == "/") ? str : str + "/";
}

// Document Processing Functions //
function processDoc(doc, fileName){
  exportPNGsFromDoc(doc, fileName);
}

function exportPNGsFromDoc(doc, fileName){
  var docURI = document.path;
  var dirURI = docURI.substr(0, docURI.lastIndexOf("/") + 1);
  var fileNameStem = fileName.substr(0, fileName.lastIndexOf("."));
  
  var newDirURI = "file://" + dirURI + fileNameStem;
  if(!FLfile.exists(newDirURI)) FLfile.createFolder(newDirURI);
  
  var tl = doc.getTimeline();
  var frameCount = tl.frameCount;
  
  appendLog("Exporting .png files for each frames:");
  for(var i=0; i<frameCount; i++){
    tl.currentFrame = i;
    var fileURI = newDirURI + "/" + "frame" + (i+1) + ".png"; // modify this line to change file names
    doc.exportPNG(fileURI, true , true);
    appendLog(fileURI);
  }
}