// ----------------------------------------------------------------------------

// markItUp! Universal MarkUp Engine, JQuery plugin

// v 1.1.5

// Dual licensed under the MIT and GPL licenses.

// ----------------------------------------------------------------------------

// Copyright (C) 2007-2008 Jay Salvat

// http://markitup.jaysalvat.com/

// ----------------------------------------------------------------------------

// Permission is hereby granted, free of charge, to any person obtaining a copy

// of this software and associated documentation files (the "Software"), to deal

// in the Software without restriction, including without limitation the rights

// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell

// copies of the Software, and to permit persons to whom the Software is

// furnished to do so, subject to the following conditions:

// 

// The above copyright notice and this permission notice shall be included in

// all copies or substantial portions of the Software.

// 

// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR

// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,

// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE

// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER

// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,

// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN

// THE SOFTWARE.

// ----------------------------------------------------------------------------

(function($) {

	$.fn.markItUp = function(settings, extraSettings) {

		var options, ctrlKey, shiftKey, altKey;

		ctrlKey = shiftKey = altKey = false;

		options = {	id:						'',

					nameSpace:				'',

					root:					'',

					previewInWindow:		'', // 'width=800, height=600, resizable=yes, scrollbars=yes'

					previewAutoRefresh:		true,

					previewPosition:		'after',

					previewTemplatePath:	'~/templates/preview.html',

					previewParserPath:		'',

					previewParserVar:		'data',

					resizeHandle:			true,

					beforeInsert:			'',

					afterInsert:			'',

					onEnter:				{},

					onShiftEnter:			{},

					onCtrlEnter:			{},

					onTab:					{},

					markupSet:			[	{ /* set */ } ]

				};

		$.extend(options, settings, extraSettings);

		// compute markItUp! path

		if (!options.root) {

			$('script').each(function(a, tag) {

				miuScript = $(tag).get(0).src.match(/(.*)jquery\.markitup(\.pack)?\.js$/);

				if (miuScript !== null) {

					options.root = miuScript[1];

				}

			});

		}

		return this.each(function() {

			var $$, textarea, levels, scrollPosition, caretPosition, caretOffset,

				clicked, hash, header, footer, previewWindow, template, iFrame, abort;

			$$ = $(this);

			textarea = this;

			levels = [];

			abort = false;

			scrollPosition = caretPosition = 0;

			caretOffset = -1;

			options.previewParserPath = localize(options.previewParserPath);

			options.previewTemplatePath = localize(options.previewTemplatePath);

			// apply the computed path to ~/

			function localize(data, inText) {

				if (inText) {

					return 	data.replace(/("|')~\//g, "$1"+options.root);

				}

				return 	data.replace(/^~\//, options.root);

			}

			// init and build editor

			function init() {

				id = ''; nameSpace = '';

				if (options.id) {

					id = 'id="'+options.id+'"';

				} else if ($$.attr("id")) {

					id = 'id="markItUp'+($$.attr("id").substr(0, 1).toUpperCase())+($$.attr("id").substr(1))+'"';

				}

				if (options.nameSpace) {

					nameSpace = 'class="'+options.nameSpace+'"';

				}

				$$.wrap('<div '+nameSpace+'></div>');

				$$.wrap('<div '+id+' class="markItUp"></div>');

				$$.wrap('<div class="markItUpContainer"></div>');

				$$.addClass("markItUpEditor");

				// add the header before the textarea

				header = $('<div class="markItUpHeader"></div>').insertBefore($$);

				$(dropMenus(options.markupSet)).appendTo(header);

				// add the footer after the textarea

				footer = $('<div class="markItUpFooter"></div>').insertAfter($$);

				// add the resize handle after textarea

				if (options.resizeHandle === true && $.browser.safari !== true) {

					resizeHandle = $('<div class="markItUpResizeHandle"></div>')

						.insertAfter($$)

						.bind("mousedown", function(e) {

							var h = $$.height(), y = e.clientY, mouseMove, mouseUp;

							mouseMove = function(e) {

								$$.css("height", Math.max(20, e.clientY+h-y)+"px");

								return false;

							};

							mouseUp = function(e) {

								$("html").unbind("mousemove", mouseMove).unbind("mouseup", mouseUp);

								return false;

							};

							$("html").bind("mousemove", mouseMove).bind("mouseup", mouseUp);

					});

					footer.append(resizeHandle);

				}

				// listen key events

				$$.keydown(keyPressed).keyup(keyPressed);

				// bind an event to catch external calls

				$$.bind("insertion", function(e, settings) {

					if (settings.target !== false) {

						get();

					}

					if (textarea === $.markItUp.focused) {

						markup(settings);

					}

				});

				// remember the last focus

				$$.focus(function() {

					$.markItUp.focused = this;

				});

			}

			// recursively build header with dropMenus from markupset

			function dropMenus(markupSet) {

				var ul = $('<ul></ul>'), i = 0;

				$('li:hover > ul', ul).css('display', 'block');

				$.each(markupSet, function() {

					var button = this, t = '', title, li, j;

					title = (button.key) ? (button.name||'')+' [Ctrl+'+button.key+']' : (button.name||'');

					key   = (button.key) ? 'accesskey="'+button.key+'"' : '';

					if (button.separator) {

						li = $('<li class="markItUpSeparator">'+(button.separator||'')+'</li>').appendTo(ul);

					} else {

						i++;

						for (j = levels.length -1; j >= 0; j--) {

							t += levels[j]+"-";

						}

						li = $('<li class="markItUpButton markItUpButton'+t+(i)+' '+(button.className||'')+'"><a href="" '+key+' title="'+title+'">'+(button.name||'')+'</a></li>')

						.bind("contextmenu", function() { // prevent contextmenu on mac and allow ctrl+click

							return false;

						}).click(function() {

							return false;

						}).mouseup(function() {

							if (button.call) {

								eval(button.call)();

							}

							markup(button);

							return false;

						}).hover(function() {

								$('> ul', this).show();

								$(document).one('click', function() { // close dropmenu if click outside

										$('ul ul', header).hide();

									}

								);

							}, function() {

								$('> ul', this).hide();

							}

						).appendTo(ul);

						if (button.dropMenu) {

							levels.push(i);

							$(li).addClass('markItUpDropMenu').append(dropMenus(button.dropMenu));

						}

					}

				}); 

				levels.pop();

				return ul;

			}

			// markItUp! markups

			function magicMarkups(string) {

				if (string) {

					string = string.toString();

					string = string.replace(/\(\!\(([\s\S]*?)\)\!\)/g,

						function(x, a) {

							var b = a.split('|!|');

							if (altKey === true) {

								return (b[1] !== undefined) ? b[1] : b[0];

							} else {

								return (b[1] === undefined) ? "" : b[0];

							}

						}

					);

					// [![prompt]!], [![prompt:!:value]!]

					string = string.replace(/\[\!\[([\s\S]*?)\]\!\]/g,

						function(x, a) {

							var b = a.split(':!:');

							if (abort === true) {

								return false;

							}

							value = prompt(b[0], (b[1]) ? b[1] : '');

							if (value === null) {

								abort = true;

							}

							return value;

						}

					);

					return string;

				}

				return "";

			}

			// prepare action

			function prepare(action) {

				if ($.isFunction(action)) {

					action = action(hash);

				}

				return magicMarkups(action);

			}

			// build block to insert

			function build(string) {

				openWith 	= prepare(clicked.openWith);

				placeHolder = prepare(clicked.placeHolder);

				replaceWith = prepare(clicked.replaceWith);

				closeWith 	= prepare(clicked.closeWith);

				if (replaceWith !== "") {

					block = openWith + replaceWith + closeWith;

				} else if (selection === '' && placeHolder !== '') {

					block = openWith + placeHolder + closeWith;

				} else {

					block = openWith + (string||selection) + closeWith;

				}

				return {	block:block, 

							openWith:openWith, 

							replaceWith:replaceWith, 

							placeHolder:placeHolder,

							closeWith:closeWith

					};

			}

			// define markup to insert

			function markup(button) {

				var len, j, n, i;

				hash = clicked = button;

				get();

				$.extend(hash, {	line:"", 

						 			root:options.root,

									textarea:textarea, 

									selection:(selection||''), 

									caretPosition:caretPosition,

									ctrlKey:ctrlKey, 

									shiftKey:shiftKey, 

									altKey:altKey

								}

							);

				// callbacks before insertion

				prepare(options.beforeInsert);

				prepare(clicked.beforeInsert);

				if (ctrlKey === true && shiftKey === true) {

					prepare(clicked.beforeMultiInsert);

				}			

				$.extend(hash, { line:1 });

				if (ctrlKey === true && shiftKey === true) {

					lines = selection.split(/\r?\n/);

					for (j = 0, n = lines.length, i = 0; i < n; i++) {

						if ($.trim(lines[i]) !== '') {

							$.extend(hash, { line:++j, selection:lines[i] } );

							lines[i] = build(lines[i]).block;

						} else {

							lines[i] = "";

						}

					}

					string = { block:lines.join('\n')};

					start = caretPosition;

					len = string.block.length + (($.browser.opera) ? n : 0);

				} else if (ctrlKey === true) {

					string = build(selection);

					start = caretPosition + string.openWith.length;

					len = string.block.length - string.openWith.length - string.closeWith.length;

					len -= fixIeBug(string.block);

				} else if (shiftKey === true) {

					string = build(selection);

					start = caretPosition;

					len = string.block.length;

					len -= fixIeBug(string.block);

				} else {

					string = build(selection);

					start = caretPosition + string.block.length ;

					len = 0;

					start -= fixIeBug(string.block);

				}

				if ((selection === '' && string.replaceWith === '')) {

					caretOffset += fixOperaBug(string.block);

					start = caretPosition + string.openWith.length;

					len = string.block.length - string.openWith.length - string.closeWith.length;

					caretOffset = $$.val().substring(caretPosition,  $$.val().length).length;

					caretOffset -= fixOperaBug($$.val().substring(0, caretPosition));

				}

				$.extend(hash, { caretPosition:caretPosition, scrollPosition:scrollPosition } );

				if (string.block !== selection && abort === false) {

					insert(string.block);

					set(start, len);

				} else {

					caretOffset = -1;

				}

				get();

				$.extend(hash, { line:'', selection:selection });

				// callbacks after insertion

				if (ctrlKey === true && shiftKey === true) {

					prepare(clicked.afterMultiInsert);

				}

				prepare(clicked.afterInsert);

				prepare(options.afterInsert);

				// refresh preview if opened

				if (previewWindow && options.previewAutoRefresh) {

					refreshPreview(); 

				}

				// reinit keyevent

				shiftKey = altKey = ctrlKey = abort = false;

			}

			// Substract linefeed in Opera