/*
 *
 * PrinterUtils (printer-utils.js)
 * Author: rtfpessoa
 *
 */

var jsDiff = JsDiff;

function PrinterUtils() {
}

PrinterUtils.prototype.getDiffName = function (oldFilename, newFilename) {
  if (oldFilename && newFilename && oldFilename !== newFilename) {
    return oldFilename + " -> " + newFilename;
  } else if (newFilename) {
    return newFilename;
  } else if (oldFilename) {
    return oldFilename;
  } else {
    return "Unknown filename";
  }
};

PrinterUtils.prototype.diffHighlight = function (diffLine1, diffLine2, isTripleDiff) {
  var lineStart1, lineStart2;

  var prefixSize = 1;

  if (isTripleDiff) prefixSize = 2;

  lineStart1 = diffLine1.substr(0, prefixSize);
  lineStart2 = diffLine2.substr(0, prefixSize);

  diffLine1 = diffLine1.substr(prefixSize);
  diffLine2 = diffLine2.substr(prefixSize);

  var diff = jsDiff.diffChars(diffLine1, diffLine2);

  var highlightedLine = "";

  diff.forEach(function (part) {
    var elemType = part.added ? 'ins' : part.removed ? 'del' : null;

    if (elemType !== null) highlightedLine += "<" + elemType + ">" + part.value + "</" + elemType + ">";
    else highlightedLine += part.value;
  });

  return {
    o: lineStart1 + removeIns(highlightedLine),
    n: lineStart2 + removeDel(highlightedLine)
  }
};

function removeIns(line) {
  return line.replace(/(<ins>((.|\n)*?)<\/ins>)/g, "");
}

function removeDel(line) {
  return line.replace(/(<del>((.|\n)*?)<\/del>)/g, "");
}