// Shortcuts
var doc = app.activeDocument;
var selection = doc.selection;

function main() {

  var outputFolder = Folder.selectDialog( 'Select folder for extracted objects.', '~' );
  if(!outputFolder) {
    alert('You have to select a folder to save the files to!\nExiting.');
    return;
  }

  // Variables to store issues
  var errors = [];

  // Loop through all selected items
  var maxIterations = selection.length;
  while(maxIterations--) {
    var obj = selection[0];

    var succeeded = false;
    // Only SymbolItems can be extracted
    if(obj instanceof SymbolItem) {
      succeeded = extractObject(obj, outputFolder);
    }
    else {
      obj.selected = false;
    }

    if(!succeeded) {
      if(!confirm('Last symbol extraction was unsuccessful, do you want to continue?\n' +
'(The program might crash if you do so)')) {
        break;
      }
    }
  }

}


function extractObject(obj, folder) {

  var newDocument = app.documents.add(DocumentColorSpace.RGB);
  var newLayer;

  // Use first layer if there is one, otherwise, create a new one
  if(newDocument.layers) {
    newLayer = newDocument.layers[0];
  }
  else {
    newLayer = newDocument.layers.add();
  }

  // Move the selected object to the layer in the new document
  obj.move(newLayer, ElementPlacement.PLACEATBEGINNING);

  // Make sure the object is selected in its new document
  obj.selected = true;

  // Resize the artboard based on the object
  try {
    newDocument.fitArtboardToSelectedArt(0);
  }
  catch(e) {
  }

  // Save the file
  var outputFilename = folder + '/' + obj.symbol.name + '.ai';
  try {
    newDocument.saveAs(new File(outputFilename));
  }
  catch(e) {
    alert('Saving of file "' + outputFilename + '" failed\n' +
'Make sure a folder named "output" exists on your desktop!');
    return false;
  }

  // Change focus to the original document
  try {
    doc.activate();
    // This causes Illustrator to crash, for no apparent reason.
    // newDocument.close();
  }
  catch(e) {
    alert('Focusing original document failed\n' +
'This program has only been tested in Illustrator CS6');
    return false;
  }

  return true;

}


main();