'use strict';

;(function (window, linkify) {
	var linkifyElement = function (linkify) {
		'use strict';

		/**
  	Linkify a HTML DOM node
  */

		var tokenize = linkify.tokenize,
		    options = linkify.options;
		var Options = options.Options;


		var TEXT_TOKEN = linkify.parser.TOKENS.TEXT;

		var HTML_NODE = 1;
		var TXT_NODE = 3;

		/**
  	Given a parent element and child node that the parent contains, replaces
  	that child with the given array of new children
  */
		function replaceChildWithChildren(parent, oldChild, newChildren) {
			var lastNewChild = newChildren[newChildren.length - 1];
			parent.replaceChild(lastNewChild, oldChild);
			for (var i = newChildren.length - 2; i >= 0; i--) {
				parent.insertBefore(newChildren[i], lastNewChild);
				lastNewChild = newChildren[i];
			}
		}

		/**
  	Given an array of MultiTokens, return an array of Nodes that are either
  	(a) Plain Text nodes (node type 3)
  	(b) Anchor tag nodes (usually, unless tag name is overridden in the options)
  
  	Takes the same options as linkifyElement and an optional doc element
  	(this should be passed in by linkifyElement)
  */
		function tokensToNodes(tokens, opts, doc) {
			var result = [];

			for (var _iterator = tokens, _isArray = Array.isArray(_iterator), _i = 0, _iterator = _isArray ? _iterator : _iterator[Symbol.iterator]();;) {
				var _ref;

				if (_isArray) {
					if (_i >= _iterator.length) break;
					_ref = _iterator[_i++];
				} else {
					_i = _iterator.next();
					if (_i.done) break;
					_ref = _i.value;
				}

				var token = _ref;

				if (token.type === 'nl' && opts.nl2br) {
					result.push(doc.createElement('br'));
					continue;
				} else if (!token.isLink || !opts.check(token)) {
					result.push(doc.createTextNode(token.toString()));
					continue;
				}

				var _opts$resolve = opts.resolve(token),
				    formatted = _opts$resolve.formatted,
				    formattedHref = _opts$resolve.formattedHref,
				    tagName = _opts$resolve.tagName,
				    className = _opts$resolve.className,
				    target = _opts$resolve.target,
				    events = _opts$resolve.events,
				    attributes = _opts$resolve.attributes;

				// Build the link


				var link = doc.createElement(tagName);
				link.setAttribute('href', formattedHref);

				if (className) {
					link.setAttribute('class', className);
				}

				if (target) {
					link.setAttribute('target', target);
				}

				// Build up additional attributes
				if (attributes) {
					for (var attr in attributes) {
						link.setAttribute(attr, attributes[attr]);
					}
				}

				if (events) {
					for (var event in events) {
						if (link.addEventListener) {
							link.addEventListener(event, events[event]);
						} else if (link.attachEvent) {
							link.attachEvent('on' + event, events[event]);
						}
					}
				}

				link.appendChild(doc.createTextNode(formatted));
				result.push(link);
			}

			return result;
		}

		// Requires document.createElement
		function linkifyElementHelper(element, opts, doc) {

			// Can the element be linkified?
			if (!element || element.nodeType !== HTML_NODE) {
				throw new Error('Cannot linkify ' + element + ' - Invalid DOM Node type');
			}

			var ignoreTags = opts.ignoreTags;

			// Is this element already a link?
			if (element.tagName === 'A' || options.contains(ignoreTags, element.tagName)) {
				// No need to linkify
				return element;
			}

			var childElement = element.firstChild;

			while (childElement) {

				switch (childElement.nodeType) {
					case HTML_NODE:
						linkifyElementHelper(childElement, opts, doc);
						break;
					case TXT_NODE:

						var str = childElement.nodeValue;
						var tokens = tokenize(str);

						if (tokens.length === 0 || tokens.length === 1 && tokens[0] instanceof TEXT_TOKEN) {
							// No node replacement required
							break;
						}

						var nodes = tokensToNodes(tokens, opts, doc);

						// Swap out the current child for the set of nodes
						replaceChildWithChildren(element, childElement, nodes);

						// so that the correct sibling is selected next
						childElement = nodes[nodes.length - 1];

						break;
				}

				childElement = childElement.nextSibling;
			}

			return element;
		}

		function linkifyElement(element, opts) {
			var doc = arguments.length > 2 && arguments[2] !== undefined ? arguments[2] : false;


			try {
				doc = doc || document || window && window.document || global && global.document;
			} catch (e) {/* do nothing for now */}

			if (!doc) {
				throw new Error('Cannot find document implementation. ' + 'If you are in a non-browser environment like Node.js, ' + 'pass the document implementation as the third argument to linkifyElement.');
			}

			opts = new Options(opts);
			return linkifyElementHelper(element, opts, doc);
		}

		// Maintain reference to the recursive helper to cache option-normalization
		linkifyElement.helper = linkifyElementHelper;
		linkifyElement.normalize = function (opts) {
			return new Options(opts);
		};

		return linkifyElement;
	}(linkify);

	window.linkifyElement = linkifyElement;
})(window, linkify);