/* eslint-disable no-var */
/* globals $, svgEditor, svgedit, svgCanvas, DOMParser */
/*
 * ext-imagelib.js
 *
 * Licensed under the MIT License
 *
 * Copyright(c) 2010 Alexis Deveria
 *
 */

svgEditor.addExtension('imagelib', function () {
	'use strict';

	var uiStrings = svgEditor.uiStrings;

	$.extend(uiStrings, {
		imagelib: {
			select_lib: 'Select an image library',
			show_list: 'Show library list',
			import_single: 'Import single',
			import_multi: 'Import multiple',
			open: 'Open as new document'
		}
	});

	var imgLibs = [
		{
			name: 'Demo library (local)',
			url: svgEditor.curConfig.extPath + 'imagelib/index.html',
			description: 'Demonstration library for SVG-edit on this server'
		},
		{
			name: 'IAN Symbol Libraries',
			url: 'https://ian.umces.edu/symbols/catalog/svgedit/album_chooser.php',
			description: 'Free library of illustrations'
		},
		{
			name: 'Openclipart',
			url: 'https://openclipart.org/svgedit',
			description: 'Share and Use Images. Over 50,000 Public Domain SVG Images and Growing.'
		}
	];

	function closeBrowser () {
		$('#imgbrowse_holder').hide();
	}

	function importImage (url) {
		var newImage = svgCanvas.addSvgElementFromJson({
			'element': 'image',
			'attr': {
				'x': 0,
				'y': 0,
				'width': 0,
				'height': 0,
				'id': svgCanvas.getNextId(),
				'style': 'pointer-events:inherit'
			}
		});
		svgCanvas.clearSelection();
		svgCanvas.addToSelection([newImage]);
		svgCanvas.setImageURL(url);
	}

	var mode = 's';
	var multiArr = [];
	var transferStopped = false;
	var pending = {};
	var preview, submit;

	window.addEventListener('message', function (evt) {
		// Receive postMessage data
		var response = evt.data;

		if (!response || typeof response !== 'string') { // Todo: Should namespace postMessage API for this extension and filter out here
			// Do nothing
			return;
		}
		try { // This block can be removed if embedAPI moves away from a string to an object (if IE9 support not needed)
			var res = JSON.parse(response);
			if (res.namespace) { // Part of embedAPI communications
				return;
			}
		} catch (e) {}

		var char1 = response.charAt(0);
		var id;
		var svgStr;
		var imgStr;

		if (char1 !== '{' && transferStopped) {
			transferStopped = false;
			return;
		}

		if (char1 === '|') {
			var secondpos = response.indexOf('|', 1);
			id = response.substr(1, secondpos - 1);
			response = response.substr(secondpos + 1);
			char1 = response.charAt(0);
		}

		// Hide possible transfer dialog box
		$('#dialog_box').hide();
		var entry, curMeta;
		switch (char1) {
		case '{':
			// Metadata
			transferStopped = false;
			curMeta = JSON.parse(response);

			pending[curMeta.id] = curMeta;

			var name = (curMeta.name || 'file');

			var message = uiStrings.notification.retrieving.replace('%s', name);

			if (mode !== 'm') {
				$.process_cancel(message, function () {
					transferStopped = true;
					// Should a message be sent back to the frame?

					$('#dialog_box').hide();
				});
			} else {
				entry = $('<div>' + message + '</div>').data('id', curMeta.id);
				preview.append(entry);
				curMeta.entry = entry;
			}

			return;
		case '<':
			svgStr = true;
			break;
		case 'd':
			if (response.indexOf('data:image/svg+xml') === 0) {
				var pre = 'data:image/svg+xml;base64,';
				var src = response.substring(pre.length);
				response = svgedit.utilities.decode64(src);
				svgStr = true;
				break;
			} else if (response.indexOf('data:image/') === 0) {
				imgStr = true;
				break;
			}
			// Else fall through
		default:
			// TODO: See if there's a way to base64 encode the binary data stream
			// var str = 'data:;base64,' + svgedit.utilities.encode64(response, true);

			// Assume it's raw image data
			// importImage(str);

			// Don't give warning as postMessage may have been used by something else
			if (mode !== 'm') {
				closeBrowser();
			} else {
				pending[id].entry.remove();
			}
			// $.alert('Unexpected data was returned: ' + response, function() {
			// 	if (mode !== 'm') {
			// 		closeBrowser();
			// 	} else {
			// 		pending[id].entry.remove();
			// 	}
			// });
			return;
		}

		switch (mode) {
		case 's':
			// Import one
			if (svgStr) {
				svgCanvas.importSvgString(response);
			} else if (imgStr) {
				importImage(response);
			}
			closeBrowser();
			break;
		case 'm':
			// Import multiple
			multiArr.push([(svgStr ? 'svg' : 'img'), response]);
			var title;
			curMeta = pending[id];
			if (svgStr) {
				if (curMeta && curMeta.name) {
					title = curMeta.name;
				} else {
					// Try to find a title
					var xml = new DOMParser().parseFromString(response, 'text/xml').documentElement;
					title = $(xml).children('title').first().text() || '(SVG #' + response.length + ')';
				}
				if (curMeta) {
					preview.children().each(function () {
						if ($(this).data('id') === id) {
							if (curMeta.preview_url) {
								$(this).html('<img src="' + curMeta.preview_url + '">' + title);
							} else {
								$(this).text(title);
							}
							submit.removeAttr('disabled');
						}
					});
				} else {
					preview.append('<div>' + title + '</div>');
					submit.removeAttr('disabled');
				}
			} else {
				if (curMeta && curMeta.preview_url) {
					title = curMeta.name || '';
				}
				if (curMeta && curMeta.preview_url) {
					entry = '<img src="' + curMeta.preview_url + '">' + title;
				} else {
					entry = '<img src="' + response + '">';
				}

				if (curMeta) {
					preview.children().each(function () {
						if ($(this).data('id') === id) {
							$(this).html(entry);
							submit.removeAttr('disabled');
						}
					});
				} else {
					preview.append($('<div>').append(entry));
					submit.removeAttr('disabled');
				}
			}
			break;
		case 'o':
			// Open
			if (!svgStr) { break; }
			svgEditor.openPrep(function (ok) {
				if (!ok) { return; }
				svgCanvas.clear();
				svgCanvas.setSvgString(response);
				// updateCanvas();
			});
			closeBrowser();
			break;
		}
	}, true);

	function toggleMulti (show) {
		$('#lib_framewrap, #imglib_opts').css({right: (show ? 200 : 10)});
		if (!preview) {
			preview = $('<div id=imglib_preview>').css({
				position: 'absolute',
				top: 45,
				right: 10,
				width: 180,
				bottom: 45,
				background: '#fff',
				overflow: 'auto'
			}).insertAfter('#lib_framewrap');

			submit = $('<button disabled>Import selected</button>')
				.appendTo('#imgbrowse')
				.on('click touchend', function () {
					$.each(multiArr, function (i) {
						var type = this[0];
						var data = this[1];
						if (type === 'svg') {
							svgCanvas.importSvgString(data);
						} else {
							importImage(data);
						}
						svgCanvas.moveSelectedElements(i * 20, i * 20, false);
					});
					preview.empty();
					multiArr = [];
					$('#imgbrowse_holder').hide();
				}).css({
					position: 'absolute',
					bottom: 10,
					right: -10
				});
		}

		preview.toggle(show);
		submit.toggle(show);
	}

	function showBrowser () {
		var browser = $('#imgbrowse');
		if (!browser.length) {
			$('<div id=imgbrowse_holder><div id=imgbrowse class=toolbar_button>' +
			'</div></div>').insertAfter('#svg_docprops');
			browser = $('#imgbrowse');

			var allLibs = uiStrings.imagelib.select_lib;

			var libOpts = $('<ul id=imglib_opts>').appendTo(browser);
			var frame = $('<iframe/>').prependTo(browser).hide().wrap('<div id=lib_framewrap>');

			var header = $('<h1>').prependTo(browser).text(allLibs).css({
				position: 'absolute',
				top: 0,
				left: 0,
				width: '100%'
			});

			var cancel = $('<button>' + uiStrings.common.cancel + '</button>')
				.appendTo(browser)
				.on('click touchend', function () {
					$('#imgbrowse_holder').hide();
				}).css({
					position: 'absolute',
					top: 5,
					right: -10
				});

			var leftBlock = $('<span>').css({position: 'absolute', top: 5, left: 10}).appendTo(browser);

			var back = $('<button hidden>' + uiStrings.imagelib.show_list + '</button>')
				.appendTo(leftBlock)
				.on('click touchend', function () {
					frame.attr('src', 'about:blank').hide();
					libOpts.show();
					header.text(allLibs);
					back.hide();
				}).css({
					'margin-right': 5
				}).hide();

			/* var type = */ $('<select><option value=s>' +
				uiStrings.imagelib.import_single + '</option><option value=m>' +
				uiStrings.imagelib.import_multi + '</option><option value=o>' +
				uiStrings.imagelib.open + '</option></select>').appendTo(leftBlock).change(function () {
				mode = $(this).val();
				switch (mode) {
				case 's':
				case 'o':
					toggleMulti(false);
					break;

				case 'm':
					// Import multiple
					toggleMulti(true);
					break;
				}
			}).css({
				'margin-top': 10
			});

			cancel.prepend($.getSvgIcon('cancel', true));
			back.prepend($.getSvgIcon('tool_imagelib', true));

			$.each(imgLibs, function (i, opts) {
				$('<li>')
					.appendTo(libOpts)
					.text(opts.name)
					.on('click touchend', function () {
						frame.attr('src', opts.url).show();
						header.text(opts.name);
						libOpts.hide();
						back.show();
					}).append('<span>' + opts.description + '</span>');
			});
		} else {
			$('#imgbrowse_holder').show();
		}
	}

	return {
		svgicons: svgEditor.curConfig.extPath + 'ext-imagelib.xml',
		buttons: [{
			id: 'tool_imagelib',
			type: 'app_menu', // _flyout
			position: 4,
			title: 'Image library',
			events: {
				'mouseup': showBrowser
			}
		}],
		callback: function () {
			$('<style>').text(
				'#imgbrowse_holder {' +
					'position: absolute;' +
					'top: 0;' +
					'left: 0;' +
					'width: 100%;' +
					'height: 100%;' +
					'background-color: rgba(0, 0, 0, .5);' +
					'z-index: 5;' +
				'}' +
				'#imgbrowse {' +
					'position: absolute;' +
					'top: 25px;' +
					'left: 25px;' +
					'right: 25px;' +
					'bottom: 25px;' +
					'min-width: 300px;' +
					'min-height: 200px;' +
					'background: #B0B0B0;' +
					'border: 1px outset #777;' +
				'}' +
				'#imgbrowse h1 {' +
					'font-size: 20px;' +
					'margin: .4em;' +
					'text-align: center;' +
				'}' +
				'#lib_framewrap,' +
				'#imgbrowse > ul {' +
					'position: absolute;' +
					'top: 45px;' +
					'left: 10px;' +
					'right: 10px;' +
					'bottom: 10px;' +
					'background: white;' +
					'margin: 0;' +
					'padding: 0;' +
				'}' +
				'#imgbrowse > ul {' +
					'overflow: auto;' +
				'}' +
				'#imgbrowse > div {' +
					'border: 1px solid #666;' +
				'}' +
				'#imglib_preview > div {' +
					'padding: 5px;' +
					'font-size: 12px;' +
				'}' +
				'#imglib_preview img {' +
					'display: block;' +
					'margin: 0 auto;' +
					'max-height: 100px;' +
				'}' +
				'#imgbrowse li {' +
					'list-style: none;' +
					'padding: .5em;' +
					'background: #E8E8E8;' +
					'border-bottom: 1px solid #B0B0B0;' +
					'line-height: 1.2em;' +
					'font-style: sans-serif;' +
					'}' +
				'#imgbrowse li > span {' +
					'color: #666;' +
					'font-size: 15px;' +
					'display: block;' +
					'}' +
				'#imgbrowse li:hover {' +
					'background: #FFC;' +
					'cursor: pointer;' +
					'}' +
				'#imgbrowse iframe {' +
					'width: 100%;' +
					'height: 100%;' +
					'border: 0;' +
				'}'
			).appendTo('head');
		}
	};
});