// The main wrapping element
var SVG = this.SVG = function(element) {
  if (SVG.supported) {
    element = createElement(element)

    return element
  }
}

// Default namespaces
SVG.ns    = 'http://www.w3.org/2000/svg'
SVG.xmlns = 'http://www.w3.org/2000/xmlns/'
SVG.xlink = 'http://www.w3.org/1999/xlink'
SVG.svgjs = 'http://svgjs.com/svgjs'

// Svg support test
SVG.supported = (function() {
  return !! document.createElementNS &&
         !! document.createElementNS(SVG.ns,'svg').createSVGRect
})()

// Don't bother to continue if SVG is not supported
if (!SVG.supported) return false

// Element id sequence
SVG.did  = 1000

// Get next named element id
SVG.eid = function(name) {
  return 'Svgjs' + capitalize(name) + (SVG.did++)
}

// Method for element creation
SVG.create = function(name) {
  // create element
  return document.createElementNS(this.ns, name)
}

// Method for extending objects
SVG.extend = function(modules, methods) {
  var key, i

  modules = Array.isArray(modules) ? modules : [modules]

  for (i = modules.length - 1; i >= 0; i--)
    if (modules[i])
      for (key in methods)
        modules[i].prototype[key] = methods[key]
}

// Invent new element
SVG.invent = function(config) {
  // Create element initializer
  var initializer = typeof config.create == 'function' ?
    config.create :
    function(node) {
      this.constructor.call(this, node || SVG.create(config.create))
    }

  // Inherit prototype
  if (config.inherit)
    initializer.prototype = new config.inherit

  // Extend with methods
  if (config.extend)
    SVG.extend(initializer, config.extend)

  // Attach construct method to parent
  if (config.construct)
    SVG.extend(config.parent || SVG.Container, config.construct)

  return initializer
}

// Adopt existing svg elements
SVG.adopt = function(node) {
  // check for presence of node
  if (!node) return null

  // make sure a node isn't already adopted
  if (node.instance) return node.instance

  if(!(node instanceof window.SVGElement))
    return new SVG.HtmlNode(node)
  
  // initialize variables
  var element

  // adopt with element-specific settings
  if (node.nodeName == 'svg')
    element = node.parentNode instanceof window.SVGElement ? new SVG.Nested(node) : new SVG.Doc(node)
  else if (node.nodeName == 'linearGradient' || node.nodeName == 'radialGradient')
    element = new SVG.Gradient(node)
  else if (SVG[capitalize(node.nodeName)])
    element = new SVG[capitalize(node.nodeName)](node)
  else
    element = new SVG.Parent(node)

  return element
}