#target photoshop

app.displayDialogs = DialogModes.NO;

var createdDocument = null;
var previousRulerUnits = app.preferences.rulerUnits;

function readJson(filePath) {
  var file = File(filePath);
  if (!file.exists) {
    throw new Error('Manifest does not exist: ' + filePath);
  }
  file.encoding = 'UTF8';
  if (!file.open('r')) {
    throw new Error('Unable to open manifest: ' + filePath);
  }
  var content = file.read();
  file.close();
  return eval('(' + content + ')');
}

try {
  app.preferences.rulerUnits = Units.PIXELS;
  var manifest = readJson(JIAPU_A01_MANIFEST);
  var psdFile = File(JIAPU_A01_PSD);

  if (psdFile.exists) {
    throw new Error('Refusing to overwrite existing PSD: ' + psdFile.fsName);
  }

  createdDocument = app.documents.add(
    manifest.canvas.width,
    manifest.canvas.height,
    manifest.canvas.resolution,
    'JIAPU_A01_SCRIPT_SOURCE',
    NewDocumentMode.RGB,
    DocumentFill.TRANSPARENT
  );

  for (var groupIndex = manifest.groups.length - 1; groupIndex >= 0; groupIndex--) {
    var groupSpec = manifest.groups[groupIndex];
    var group = createdDocument.layerSets.add();
    group.name = groupSpec.name;
    group.visible = groupSpec.visible;
  }

  if (createdDocument.artLayers.length > 0) {
    createdDocument.artLayers[0].remove();
  }

  var saveOptions = new PhotoshopSaveOptions();
  saveOptions.layers = true;
  createdDocument.saveAs(psdFile, saveOptions, true, Extension.LOWERCASE);
  createdDocument.close(SaveOptions.DONOTSAVECHANGES);
  createdDocument = null;
} catch (error) {
  if (createdDocument !== null) {
    createdDocument.close(SaveOptions.DONOTSAVECHANGES);
  }
  throw error;
} finally {
  app.preferences.rulerUnits = previousRulerUnits;
}