/**
 * plugin.js
 *
 * Copyright, Moxiecode Systems AB
 * Released under LGPL License.
 *
 * License: http://www.tinymce.com/license
 * Contributing: http://www.tinymce.com/contributing
 */

/*global tinymce:true */

tinymce.PluginManager.add('image', function(editor) {
	function getImageSize(url, callback) {
		var img = document.createElement('img');

		function done(width, height) {
			if (img.parentNode) {
				img.parentNode.removeChild(img);
			}

			callback({width: width, height: height});
		}

		img.onload = function() {
			done(img.clientWidth, img.clientHeight);
		};

		img.onerror = function() {
			done();
		};

		var style = img.style;
		style.visibility = 'hidden';
		style.position = 'fixed';
		style.bottom = style.left = 0;
		style.width = style.height = 'auto';

		document.body.appendChild(img);
		img.src = url;
	}

	function applyPreview(items) {
		tinymce.each(items, function(item) {
			item.textStyle = function() {
				return editor.formatter.getCssText({inline: 'img', classes: [item.value]});
			};
		});

		return items;
	}

	function createImageList(callback) {
		return function() {
			var imageList = editor.settings.image_list;

			if (typeof(imageList) == "string") {
				tinymce.util.XHR.send({
					url: imageList,
					success: function(text) {
						callback(tinymce.util.JSON.parse(text));
					}
				});
			} else if (typeof(imageList) == "function") {
				imageList(callback);
			} else {
				callback(imageList);
			}
		};
	}

	function showDialog(imageList) {
		var win, data = {}, dom = editor.dom, imgElm = editor.selection.getNode();
		var width, height, imageListCtrl, classListCtrl;

		function buildValues(listSettingName, dataItemName, defaultItems) {
			var selectedItem, items = [];

			tinymce.each(editor.settings[listSettingName] || defaultItems, function(target) {
				var item = {
					text: target.text || target.title,
					value: target.value
				};

				items.push(item);

				if (data[dataItemName] === target.value || (!selectedItem && target.selected)) {
					selectedItem = item;
				}
			});

			if (selectedItem && !data[dataItemName]) {
				data[dataItemName] = selectedItem.value;
				selectedItem.selected = true;
			}

			return items;
		}

		function buildImageList() {
			function appendItems(values, output) {
				output = output || [];

				tinymce.each(values, function(value) {
					var item = {text: value.text || value.title};

					if (value.menu) {
						item.menu = appendItems(value.menu);
					} else {
						item.value = editor.convertURL(value.value || value.url, 'src');
					}

					output.push(item);
				});

				return output;
			}

			return appendItems(imageList, [{text: 'None', value: ''}]);
		}

		function recalcSize() {
			var widthCtrl, heightCtrl, newWidth, newHeight;

			widthCtrl = win.find('#width')[0];
			heightCtrl = win.find('#height')[0];

			newWidth = widthCtrl.value();
			newHeight = heightCtrl.value();

			if (win.find('#constrain')[0].checked() && width && height && newWidth && newHeight) {
				if (width != newWidth) {
					newHeight = Math.round((newWidth / width) * newHeight);
					heightCtrl.value(newHeight);
				} else {
					newWidth = Math.round((newHeight / height) * newWidth);
					widthCtrl.value(newWidth);
				}
			}

			width = newWidth;
			height = newHeight;
		}

		function onSubmitForm() {
			function waitLoad(imgElm) {
				function selectImage() {
					imgElm.onload = imgElm.onerror = null;
					editor.selection.select(imgElm);
					editor.nodeChanged();
				}

				imgElm.onload = function() {
					if (!data.width && !data.height) {
						dom.setAttribs(imgElm, {
							width: imgElm.clientWidth,
							height: imgElm.clientHeight
						});
					}

					selectImage();
				};

				imgElm.onerror = selectImage;
			}

			updateStyle();
			recalcSize();

			data = tinymce.extend(data, win.toJSON());

			if (!data.alt) {
				data.alt = '';
			}

			if (data.width === '') {
				data.width = null;
			}

			if (data.height === '') {
				data.height = null;
			}

			if (!data.style) {
				data.style = null;
			}

			data = {
				src: data.src,
				alt: data.alt,
				width: data.width,
				height: data.height,
				style: data.style,
				"class": data["class"]
			};

			if (!data["class"]) {
				delete data["class"];
			}

			editor.undoManager.transact(function() {
				if (!data.src) {
					if (imgElm) {
						dom.remove(imgElm);
						editor.focus();
						editor.nodeChanged();
					}

					return;
				}

				if (!imgElm) {
					data.id = '__mcenew';
					editor.focus();
					editor.selection.setContent(dom.createHTML('img', data));
					imgElm = dom.get('__mcenew');
					dom.setAttrib(imgElm, 'id', null);
				} else {
					dom.setAttribs(imgElm, data);
				}

				waitLoad(imgElm);
			});
		}

		function removePixelSuffix(value) {
			if (value) {
				value = value.replace(/px$/, '');
			}

			return value;
		}

		function srcChange() {
			if (imageListCtrl) {
				imageListCtrl.value(editor.convertURL(this.value(), 'src'));
			}

			getImageSize(this.value(), function(data) {
				if (data.width && data.height) {
					width = data.width;
					height = data.height;

					win.find('#width').value(width);
					win.find('#height').value(height);
				}
			});
		}

		width = dom.getAttrib(imgElm, 'width');
		height = dom.getAttrib(imgElm, 'height');

		if (imgElm.nodeName == 'IMG' && !imgElm.getAttribute('data-mce-object') && !imgElm.getAttribute('data-mce-placeholder')) {
			data = {
				src: dom.getAttrib(imgElm, 'src'),
				alt: dom.getAttrib(imgElm, 'alt'),
				"class": dom.getAttrib(imgElm, 'class'),
				width: width,
				height: height
			};
		} else {
			imgElm = null;
		}

		if (imageList) {
			imageListCtrl = {
				type: 'listbox',
				label: 'Image list',
				values: buildImageList(),
				value: data.src && editor.convertURL(data.src, 'src'),
				onselect: function(e) {
					var altCtrl = win.find('#alt');

					if (!altCtrl.value() || (e.lastControl && altCtrl.value() == e.lastControl.text())) {
						altCtrl.value(e.control.text());
					}

					win.find('#src').value(e.control.value()).fire('change');
				},
				onPostRender: function() {
					imageListCtrl = this;
				}
			};
		}

		if (editor.settings.image_class_list) {
			classListCtrl = {
				name: 'class',
				type: 'listbox',
				label: 'Class',
				values: applyPreview(buildValues('image_class_list', 'class'))
			};
		}

		// General settings shared between simple and advanced dialogs
		var generalFormItems = [
			{name: 'src', type: 'filepicker', filetype: 'image', label: 'Source', autofocus: true, onchange: srcChange},
			imageListCtrl
		];

		if (editor.settings.image_description !== false) {
			generalFormItems.push({name: 'alt', type: 'textbox', label: 'Image description'});
		}

		if (editor.settings.image_dimensions !== false) {
			generalFormItems.push({
				type: 'container',
				label: 'Dimensions',
				layout: 'flex',
				direction: 'row',
				align: 'center',
				spacing: 5,
				items: [
					{name: 'width', type: 'textbox', maxLength: 5, size: 3, onchange: recalcSize, ariaLabel: 'Width'},
					{type: 'label', text: 'x'},
					{name: 'height', type: 'textbox', maxLength: 5, size: 3, onchange: recalcSize, ariaLabel: 'Height'},
					{name: 'constrain', type: 'checkbox', checked: true, text: 'Constrain proportions'}
				]
			});
		}

		generalFormItems.push(classListCtrl);

		function updateStyle() {
			function addPixelSuffix(value) {
				if (value.length > 0 && /^[0-9]+$/.test(value)) {
					value += 'px';
				}

				return value;
			}

			if (!editor.settings.image_advtab) {
				return;
			}

			var data = win.toJSON();
			var css = dom.parseStyle(data.style);

			delete css.margin;
			css['margin-top'] = css['margin-bottom'] = addPixelSuffix(data.vspace);
			css['margin-left'] = css['margin-right'] = addPixelSuffix(data.hspace);
			css['border-width'] = addPixelSuffix(data.border);

			win.find('#style').value(dom.serializeStyle(dom.parseStyle(dom.serializeStyle(css))));
		}

		if (editor.settings.image_advtab) {
			// Parse styles from img
			if (imgElm) {
				data.hspace = removePixelSuffix(imgElm.style.marginLeft || imgElm.style.marginRight);
				data.vspace = removePixelSuffix(imgElm.style.marginTop || imgElm.style.marginBottom);
				data.border = removePixelSuffix(imgElm.style.borderWidth);
				data.style = editor.dom.serializeStyle(editor.dom.parseStyle(editor.dom.getAttrib(imgElm, 'style')));
			}

			// Advanced dialog shows general+advanced tabs
			win = editor.windowManager.open({
				title: 'Insert/edit image',
				data: data,
				bodyType: 'tabpanel',
				body: [
					{
						title: 'General',
						type: 'form',
						items: generalFormItems
					},

					{
						title: 'Advanced',
						type: 'form',
						pack: 'start',
						items: [
							{
								label: 'Style',
								name: 'style',
								type: 'textbox'
							},
							{
								type: 'form',
								layout: 'grid',
								packV: 'start',
								columns: 2,
								padding: 0,
								alignH: ['left', 'right'],
								defaults: {
									type: 'textbox',
									maxWidth: 50,
									onchange: updateStyle
								},
								items: [
									{label: 'Vertical space', name: 'vspace'},
									{label: 'Horizontal space', name: 'hspace'},
									{label: 'Border', name: 'border'}
								]
							}
						]
					}
				],
				onSubmit: onSubmitForm
			});
		} else {
			// Simple default dialog
			win = editor.windowManager.open({
				title: 'Insert/edit image',
				data: data,
				body: generalFormItems,
				onSubmit: onSubmitForm
			});
		}
	}

	editor.addButton('image', {
		icon: 'image',
		tooltip: 'Insert/edit image',
		onclick: createImageList(showDialog),
		stateSelector: 'img:not([data-mce-object],[data-mce-placeholder])'
	});

	editor.addMenuItem('image', {
		icon: 'image',
		text: 'Insert image',
		onclick: createImageList(showDialog),
		context: 'insert',
		prependToContext: true
	});
});
