/* eslint-disable no-var */
/* globals $, svgedit */
/**
 * Package: svgedit.browser
 *
 * Licensed under the MIT License
 *
 * Copyright(c) 2010 Jeff Schiller
 * Copyright(c) 2010 Alexis Deveria
 */

// Dependencies:
// 1) jQuery (for $.alert())

(function () {
'use strict';

if (!svgedit.browser) {
  svgedit.browser = {};
}

// alias
var NS = svgedit.NS;

var supportsSvg_ = (function () {
  return !!document.createElementNS && !!document.createElementNS(NS.SVG, 'svg').createSVGRect;
}());

svgedit.browser.supportsSvg = function () { return supportsSvg_; };
if (!svgedit.browser.supportsSvg()) {
  window.location = 'browser-not-supported.html';
  return;
}

var userAgent = navigator.userAgent;
var svg = document.createElementNS(NS.SVG, 'svg');

// Note: Browser sniffing should only be used if no other detection method is possible
var isOpera_ = !!window.opera;
var isWebkit_ = userAgent.indexOf('AppleWebKit') >= 0;
var isGecko_ = userAgent.indexOf('Gecko/') >= 0;
var isIE_ = userAgent.indexOf('MSIE') >= 0;
var isChrome_ = userAgent.indexOf('Chrome/') >= 0;
var isWindows_ = userAgent.indexOf('Windows') >= 0;
var isMac_ = userAgent.indexOf('Macintosh') >= 0;
var isTouch_ = 'ontouchstart' in window;

var supportsSelectors_ = (function () {
  return !!svg.querySelector;
}());

var supportsXpath_ = (function () {
  return !!document.evaluate;
}());

// segList functions (for FF1.5 and 2.0)
var supportsPathReplaceItem_ = (function () {
  var path = document.createElementNS(NS.SVG, 'path');
  path.setAttribute('d', 'M0,0 10,10');
  var seglist = path.pathSegList;
  var seg = path.createSVGPathSegLinetoAbs(5, 5);
  try {
    seglist.replaceItem(seg, 1);
    return true;
  } catch (err) {}
  return false;
}());

var supportsPathInsertItemBefore_ = (function () {
  var path = document.createElementNS(NS.SVG, 'path');
  path.setAttribute('d', 'M0,0 10,10');
  var seglist = path.pathSegList;
  var seg = path.createSVGPathSegLinetoAbs(5, 5);
  try {
    seglist.insertItemBefore(seg, 1);
    return true;
  } catch (err) {}
  return false;
}());

// text character positioning (for IE9)
var supportsGoodTextCharPos_ = (function () {
  var svgroot = document.createElementNS(NS.SVG, 'svg');
  var svgcontent = document.createElementNS(NS.SVG, 'svg');
  document.documentElement.appendChild(svgroot);
  svgcontent.setAttribute('x', 5);
  svgroot.appendChild(svgcontent);
  var text = document.createElementNS(NS.SVG, 'text');
  text.textContent = 'a';
  svgcontent.appendChild(text);
  var pos = text.getStartPositionOfChar(0).x;
  document.documentElement.removeChild(svgroot);
  return (pos === 0);
}());

var supportsPathBBox_ = (function () {
  var svgcontent = document.createElementNS(NS.SVG, 'svg');
  document.documentElement.appendChild(svgcontent);
  var path = document.createElementNS(NS.SVG, 'path');
  path.setAttribute('d', 'M0,0 C0,0 10,10 10,0');
  svgcontent.appendChild(path);
  var bbox = path.getBBox();
  document.documentElement.removeChild(svgcontent);
  return (bbox.height > 4 && bbox.height < 5);
}());

// Support for correct bbox sizing on groups with horizontal/vertical lines
var supportsHVLineContainerBBox_ = (function () {
  var svgcontent = document.createElementNS(NS.SVG, 'svg');
  document.documentElement.appendChild(svgcontent);
  var path = document.createElementNS(NS.SVG, 'path');
  path.setAttribute('d', 'M0,0 10,0');
  var path2 = document.createElementNS(NS.SVG, 'path');
  path2.setAttribute('d', 'M5,0 15,0');
  var g = document.createElementNS(NS.SVG, 'g');
  g.appendChild(path);
  g.appendChild(path2);
  svgcontent.appendChild(g);
  var bbox = g.getBBox();
  document.documentElement.removeChild(svgcontent);
  // Webkit gives 0, FF gives 10, Opera (correctly) gives 15
  return (bbox.width === 15);
}());

var supportsEditableText_ = (function () {
  // TODO: Find better way to check support for this
  return isOpera_;
}());

var supportsGoodDecimals_ = (function () {
  // Correct decimals on clone attributes (Opera < 10.5/win/non-en)
  var rect = document.createElementNS(NS.SVG, 'rect');
  rect.setAttribute('x', 0.1);
  var crect = rect.cloneNode(false);
  var retValue = (crect.getAttribute('x').indexOf(',') === -1);
  if (!retValue) {
    $.alert('NOTE: This version of Opera is known to contain bugs in SVG-edit.\n' +
    'Please upgrade to the <a href="http://opera.com">latest version</a> in which the problems have been fixed.');
  }
  return retValue;
}());

var supportsNonScalingStroke_ = (function () {
  var rect = document.createElementNS(NS.SVG, 'rect');
  rect.setAttribute('style', 'vector-effect:non-scaling-stroke');
  return rect.style.vectorEffect === 'non-scaling-stroke';
}());

var supportsNativeSVGTransformLists_ = (function () {
  var rect = document.createElementNS(NS.SVG, 'rect');
  var rxform = rect.transform.baseVal;
  var t1 = svg.createSVGTransform();
  rxform.appendItem(t1);
  var r1 = rxform.getItem(0);
  return r1 instanceof SVGTransform && t1 instanceof SVGTransform &&
    r1.type === t1.type && r1.angle === t1.angle &&
    r1.matrix.a === t1.matrix.a &&
    r1.matrix.b === t1.matrix.b &&
    r1.matrix.c === t1.matrix.c &&
    r1.matrix.d === t1.matrix.d &&
    r1.matrix.e === t1.matrix.e &&
    r1.matrix.f === t1.matrix.f;
}());

// Public API

svgedit.browser.isOpera = function () { return isOpera_; };
svgedit.browser.isWebkit = function () { return isWebkit_; };
svgedit.browser.isGecko = function () { return isGecko_; };
svgedit.browser.isIE = function () { return isIE_; };
svgedit.browser.isChrome = function () { return isChrome_; };
svgedit.browser.isWindows = function () { return isWindows_; };
svgedit.browser.isMac = function () { return isMac_; };
svgedit.browser.isTouch = function () { return isTouch_; };

svgedit.browser.supportsSelectors = function () { return supportsSelectors_; };
svgedit.browser.supportsXpath = function () { return supportsXpath_; };

svgedit.browser.supportsPathReplaceItem = function () { return supportsPathReplaceItem_; };
svgedit.browser.supportsPathInsertItemBefore = function () { return supportsPathInsertItemBefore_; };
svgedit.browser.supportsPathBBox = function () { return supportsPathBBox_; };
svgedit.browser.supportsHVLineContainerBBox = function () { return supportsHVLineContainerBBox_; };
svgedit.browser.supportsGoodTextCharPos = function () { return supportsGoodTextCharPos_; };
svgedit.browser.supportsEditableText = function () { return supportsEditableText_; };
svgedit.browser.supportsGoodDecimals = function () { return supportsGoodDecimals_; };
svgedit.browser.supportsNonScalingStroke = function () { return supportsNonScalingStroke_; };
svgedit.browser.supportsNativeTransformLists = function () { return supportsNativeSVGTransformLists_; };
}());