// CodeMirror, copyright (c) by Marijn Haverbeke and others
// Distributed under an MIT license: http://codemirror.net/LICENSE

(function(mod) {
  if (typeof exports == "object" && typeof module == "object") // CommonJS
	mod(require("../../lib/codemirror"), require("../markdown/markdown"), require("../../addon/mode/overlay"));
  else if (typeof define == "function" && define.amd) // AMD
	define(["../../lib/codemirror", "../markdown/markdown", "../../addon/mode/overlay"], mod);
  else // Plain browser env
	mod(CodeMirror);
})(function(CodeMirror) {
"use strict";

var urlRE = /^((?:coap|doi|javascript|aaa|aaas|about|acap|cap|cid|crid|data|dav|dict|dns|file|ftp|geo|go|gopher|h323|http|https|iax|icap|im|imap|info|ipp|iris|iris\.beep|iris\.xpc|iris\.xpcs|iris\.lwz|ldap|mailto|mid|msrp|msrps|mtqp|mupdate|news|nfs|ni|nih|nntp|opaquelocktoken|pop|pres|rtsp|service|session|shttp|sieve|sip|sips|sms|snmp|soap\.beep|soap\.beeps|tag|tel|telnet|tftp|thismessage|tn3270|tip|tv|urn|vemmi|ws|wss|xcon|xcon-userid|xmlrpc\.beep|xmlrpc\.beeps|xmpp|z39\.50r|z39\.50s|adiumxtra|afp|afs|aim|apt|attachment|aw|beshare|bitcoin|bolo|callto|chrome|chrome-extension|com-eventbrite-attendee|content|cvs|dlna-playsingle|dlna-playcontainer|dtn|dvb|ed2k|facetime|feed|finger|fish|gg|git|gizmoproject|gtalk|hcp|icon|ipn|irc|irc6|ircs|itms|jar|jms|keyparc|lastfm|ldaps|magnet|maps|market|message|mms|ms-help|msnim|mumble|mvn|notes|oid|palm|paparazzi|platform|proxy|psyc|query|res|resource|rmi|rsync|rtmp|secondlife|sftp|sgn|skype|smb|soldat|spotify|ssh|steam|svn|teamspeak|things|udp|unreal|ut2004|ventrilo|view-source|webcal|wtai|wyciwyg|xfire|xri|ymsgr:(?:\/{1,3}|[a-z0-9%])|www\d{0,3}[.]|[a-z0-9.\-]+[.][a-z]{2,4}\/)(?:[^\s()<>]|\([^\s()<>]*\))+(?:\([^\s()<>]*\)|[^\s`*!()\[\]{};:'".,<>?«»“”‘’]))/i

CodeMirror.defineMode("gfm", function(config, modeConfig) {
  // Should GitHub spice be added (like linking #Num, SHA, etc.)
  if (modeConfig.gitHubSpice === undefined)
	modeConfig.gitHubSpice = true;

  var codeDepth = 0;
  function blankLine(state) {
	state.code = false;
	return null;
  }
  var gfmOverlay = {
	startState: function() {
	  return {
		code: false,
		codeBlock: false,
		ateSpace: false
	  };
	},
	copyState: function(s) {
	  return {
		code: s.code,
		codeBlock: s.codeBlock,
		ateSpace: s.ateSpace
	  };
	},
	token: function(stream, state) {
	  state.combineTokens = null;

	  // Hack to prevent formatting override inside code blocks (block and inline)
	  if (state.codeBlock) {
		if (stream.match(/^```/)) {
		  state.codeBlock = false;
		  return null;
		}
		stream.skipToEnd();
		return null;
	  }
	  if (stream.sol()) {
		state.code = false;
	  }
	  if (stream.sol() && stream.match(/^```/)) {
		stream.skipToEnd();
		state.codeBlock = true;
		return null;
	  }
	  // If this block is changed, it may need to be updated in Markdown mode
	  if (stream.peek() === '`') {
		stream.next();
		var before = stream.pos;
		stream.eatWhile('`');
		var difference = 1 + stream.pos - before;
		if (!state.code) {
		  codeDepth = difference;
		  state.code = true;
		} else {
		  if (difference === codeDepth) { // Must be exact
			state.code = false;
		  }
		}
		return null;
	  } else if (state.code) {
		stream.next();
		return null;
	  }
	  // Check if space. If so, links can be formatted later on
	  if (stream.eatSpace()) {
		state.ateSpace = true;
		return null;
	  }
	  if (stream.sol() || state.ateSpace) {
		state.ateSpace = false;
		if (modeConfig.gitHubSpice) {
		  if(stream.match(/^(?:[a-zA-Z0-9\-_]+\/)?(?:[a-zA-Z0-9\-_]+@)?(?:[a-f0-9]{7,40}\b)/)) {
			// User/Project@SHA
			// User@SHA
			// SHA
			state.combineTokens = true;
			return "link";
		  } else if (stream.match(/^(?:[a-zA-Z0-9\-_]+\/)?(?:[a-zA-Z0-9\-_]+)?#[0-9]+\b/)) {
			// User/Project#Num
			// User#Num
			// #Num
			state.combineTokens = true;
			return "link";
		  }
		}
	  }
	  if (stream.match(urlRE) &&
		 stream.string.slice(stream.start - 2, stream.start) != "](") {
		// URLs
		// Taken from http://daringfireball.net/2010/07/improved_regex_for_matching_urls
		// And then (issue #1160) simplified to make it not crash the Chrome Regexp engine
		// And then limited url schemes to the CommonMark list, so foo:bar isn't matched as a URL
		state.combineTokens = true;
		return "link";
	  }
	  stream.next();
	  return null;
	},
	blankLine: blankLine
  };

  var markdownConfig = {
	underscoresBreakWords: false,
	taskLists: true,
	fencedCodeBlocks: true,
	strikethrough: true
  };
  for (var attr in modeConfig) {
	markdownConfig[attr] = modeConfig[attr];
  }
  markdownConfig.name = "markdown";
  return CodeMirror.overlayMode(CodeMirror.getMode(config, markdownConfig), gfmOverlay);

}, "markdown");

  CodeMirror.defineMIME("text/x-gfm", "gfm");
});