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

svgEditor.addExtension('Connector', function (S) {
	var svgcontent = S.svgcontent,
		svgroot = S.svgroot,
		getNextId = S.getNextId,
		getElem = S.getElem,
		addElem = S.addSvgElementFromJson,
		selManager = S.selectorManager,
		curConfig = svgEditor.curConfig,
		started = false,
		startX,
		startY,
		curLine,
		startElem,
		endElem,
		connections = [],
		connSel = '.se_connector',
		seNs,
		// connect_str = '-SE_CONNECT-',
		selElems = [],
		elData = $.data;

	var langList = {
		'en': [
			{'id': 'mode_connect', 'title': 'Connect two objects'}
		],
		'fr': [
			{'id': 'mode_connect', 'title': 'Connecter deux objets'}
		]
	};

	function getBBintersect (x, y, bb, offset) {
		if (offset) {
			offset -= 0;
			bb = $.extend({}, bb);
			bb.width += offset;
			bb.height += offset;
			bb.x -= offset / 2;
			bb.y -= offset / 2;
		}

		var midX = bb.x + bb.width / 2;
		var midY = bb.y + bb.height / 2;
		var lenX = x - midX;
		var lenY = y - midY;

		var slope = Math.abs(lenY / lenX);

		var ratio;

		if (slope < bb.height / bb.width) {
			ratio = (bb.width / 2) / Math.abs(lenX);
		} else {
			ratio = (bb.height / 2) / Math.abs(lenY);
		}

		return {
			x: midX + lenX * ratio,
			y: midY + lenY * ratio
		};
	}

	function getOffset (side, line) {
		var giveOffset = !!line.getAttribute('marker-' + side);
		// var giveOffset = $(line).data(side+'_off');

		// TODO: Make this number (5) be based on marker width/height
		var size = line.getAttribute('stroke-width') * 5;
		return giveOffset ? size : 0;
	}

	function showPanel (on) {
		var connRules = $('#connector_rules');
		if (!connRules.length) {
			connRules = $('<style id="connector_rules"></style>').appendTo('head');
		}
		connRules.text(!on ? '' : '#tool_clone, #tool_topath, #tool_angle, #xy_panel { display: none !important; }');
		$('#connector_panel').toggle(on);
	}

	function setPoint (elem, pos, x, y, setMid) {
		var i, pts = elem.points;
		var pt = svgroot.createSVGPoint();
		pt.x = x;
		pt.y = y;
		if (pos === 'end') { pos = pts.numberOfItems - 1; }
		// TODO: Test for this on init, then use alt only if needed
		try {
			pts.replaceItem(pt, pos);
		} catch (err) {
			// Should only occur in FF which formats points attr as "n,n n,n", so just split
			var ptArr = elem.getAttribute('points').split(' ');
			for (i = 0; i < ptArr.length; i++) {
				if (i === pos) {
					ptArr[i] = x + ',' + y;
				}
			}
			elem.setAttribute('points', ptArr.join(' '));
		}

		if (setMid) {
			// Add center point
			var ptStart = pts.getItem(0);
			var ptEnd = pts.getItem(pts.numberOfItems - 1);
			setPoint(elem, 1, (ptEnd.x + ptStart.x) / 2, (ptEnd.y + ptStart.y) / 2);
		}
	}

	function updateLine (diffX, diffY) {
		// Update line with element
		var i = connections.length;
		while (i--) {
			var conn = connections[i];
			var line = conn.connector;
			// var elem = conn.elem;

			var pre = conn.is_start ? 'start' : 'end';
			// var sw = line.getAttribute('stroke-width') * 5;

			// Update bbox for this element
			var bb = elData(line, pre + '_bb');
			bb.x = conn.start_x + diffX;
			bb.y = conn.start_y + diffY;
			elData(line, pre + '_bb', bb);

			var altPre = conn.is_start ? 'end' : 'start';

			// Get center pt of connected element
			var bb2 = elData(line, altPre + '_bb');
			var srcX = bb2.x + bb2.width / 2;
			var srcY = bb2.y + bb2.height / 2;

			// Set point of element being moved
			var pt = getBBintersect(srcX, srcY, bb, getOffset(pre, line)); // $(line).data(pre+'_off')?sw:0
			setPoint(line, conn.is_start ? 0 : 'end', pt.x, pt.y, true);

			// Set point of connected element
			var pt2 = getBBintersect(pt.x, pt.y, elData(line, altPre + '_bb'), getOffset(altPre, line));
			setPoint(line, conn.is_start ? 'end' : 0, pt2.x, pt2.y, true);
		}
	}

	function findConnectors (elems) {
		var i;
		if (!elems) { elems = selElems; }
		var connectors = $(svgcontent).find(connSel);
		connections = [];

		// Loop through connectors to see if one is connected to the element
		connectors.each(function () {
			var addThis;
			function add () {
				if ($.inArray(this, elems) !== -1) {
					// Pretend this element is selected
					addThis = true;
				}
			}

			// Grab the ends
			var parts = [];
			['start', 'end'].forEach(function (pos, i) {
				var key = 'c_' + pos;
				var part = elData(this, key);
				if (part == null) {
					part = document.getElementById(
						this.attributes['se:connector'].value.split(' ')[i]
					);
					elData(this, 'c_' + pos, part.id);
					elData(this, pos + '_bb', svgCanvas.getStrokedBBox([part]));
				} else part = document.getElementById(part);
				parts.push(part);
			}.bind(this));

			for (i = 0; i < 2; i++) {
				var cElem = parts[i];

				addThis = false;
				// The connected element might be part of a selected group
				$(cElem).parents().each(add);

				if (!cElem || !cElem.parentNode) {
					$(this).remove();
					continue;
				}
				if ($.inArray(cElem, elems) !== -1 || addThis) {
					var bb = svgCanvas.getStrokedBBox([cElem]);
					connections.push({
						elem: cElem,
						connector: this,
						is_start: (i === 0),
						start_x: bb.x,
						start_y: bb.y
					});
				}
			}
		});
	}

	function updateConnectors (elems) {
		// Updates connector lines based on selected elements
		// Is not used on mousemove, as it runs getStrokedBBox every time,
		// which isn't necessary there.
		var i, j;
		findConnectors(elems);
		if (connections.length) {
			// Update line with element
			i = connections.length;
			while (i--) {
				var conn = connections[i];
				var line = conn.connector;
				var elem = conn.elem;

				// var sw = line.getAttribute('stroke-width') * 5;
				var pre = conn.is_start ? 'start' : 'end';

				// Update bbox for this element
				var bb = svgCanvas.getStrokedBBox([elem]);
				bb.x = conn.start_x;
				bb.y = conn.start_y;
				elData(line, pre + '_bb', bb);
				/* var addOffset = */ elData(line, pre + '_off');

				var altPre = conn.is_start ? 'end' : 'start';

				// Get center pt of connected element
				var bb2 = elData(line, altPre + '_bb');
				var srcX = bb2.x + bb2.width / 2;
				var srcY = bb2.y + bb2.height / 2;

				// Set point of element being moved
				var pt = getBBintersect(srcX, srcY, bb, getOffset(pre, line));
				setPoint(line, conn.is_start ? 0 : 'end', pt.x, pt.y, true);

				// Set point of connected element
				var pt2 = getBBintersect(pt.x, pt.y, elData(line, altPre + '_bb'), getOffset(altPre, line));
				setPoint(line, conn.is_start ? 'end' : 0, pt2.x, pt2.y, true);

				// Update points attribute manually for webkit
				if (navigator.userAgent.indexOf('AppleWebKit') !== -1) {
					var pts = line.points;
					var len = pts.numberOfItems;
					var ptArr = [];
					for (j = 0; j < len; j++) {
						pt = pts.getItem(j);
						ptArr[j] = pt.x + ',' + pt.y;
					}
					line.setAttribute('points', ptArr.join(' '));
				}
			}
		}
	}

	// Do once
	(function () {
		var gse = svgCanvas.groupSelectedElements;

		svgCanvas.groupSelectedElements = function () {
			svgCanvas.removeFromSelection($(connSel).toArray());
			return gse.apply(this, arguments);
		};

		var mse = svgCanvas.moveSelectedElements;

		svgCanvas.moveSelectedElements = function () {
			var cmd = mse.apply(this, arguments);
			updateConnectors();
			return cmd;
		};

		seNs = svgCanvas.getEditorNS();
	}());

	// Do on reset
	function init () {
		// Make sure all connectors have data set
		$(svgcontent).find('*').each(function () {
			var conn = this.getAttributeNS(seNs, 'connector');
			if (conn) {
				this.setAttribute('class', connSel.substr(1));
				var connData = conn.split(' ');
				var sbb = svgCanvas.getStrokedBBox([getElem(connData[0])]);
				var ebb = svgCanvas.getStrokedBBox([getElem(connData[1])]);
				$(this).data('c_start', connData[0])
					.data('c_end', connData[1])
					.data('start_bb', sbb)
					.data('end_bb', ebb);
				svgCanvas.getEditorNS(true);
			}
		});
		// updateConnectors();
	}

	// $(svgroot).parent().mousemove(function (e) {
	// // if (started
	// // 	|| svgCanvas.getMode() !== 'connector'
	// //	|| e.target.parentNode.parentNode !== svgcontent) return;
	//
	// console.log('y')
	// // if (e.target.parentNode.parentNode === svgcontent) {
	// //
	// // }
	// });

	return {
		name: 'Connector',
		svgicons: svgEditor.curConfig.imgPath + 'conn.svg',
		buttons: [{
			id: 'mode_connect',
			type: 'mode',
			icon: svgEditor.curConfig.imgPath + 'cut.png',
			title: 'Connect two objects',
			includeWith: {
				button: '#tool_line',
				isDefault: false,
				position: 1
			},
			events: {
				'click': function () {
					svgCanvas.setMode('connector');
				}
			}
		}],
		addLangData: function (lang) {
			return {
				data: langList[lang]
			};
		},
		mouseDown: function (opts) {
			var e = opts.event;
			startX = opts.start_x;
			startY = opts.start_y;
			var mode = svgCanvas.getMode();

			if (mode === 'connector') {
				if (started) { return; }

				var mouseTarget = e.target;

				var parents = $(mouseTarget).parents();

				if ($.inArray(svgcontent, parents) !== -1) {
					// Connectable element

					// If child of foreignObject, use parent
					var fo = $(mouseTarget).closest('foreignObject');
					startElem = fo.length ? fo[0] : mouseTarget;

					// Get center of source element
					var bb = svgCanvas.getStrokedBBox([startElem]);
					var x = bb.x + bb.width / 2;
					var y = bb.y + bb.height / 2;

					started = true;
					curLine = addElem({
						'element': 'polyline',
						'attr': {
							'id': getNextId(),
							'points': (x + ',' + y + ' ' + x + ',' + y + ' ' + startX + ',' + startY),
							'stroke': '#' + curConfig.initStroke.color,
							'stroke-width': (!startElem.stroke_width || startElem.stroke_width === 0) ? curConfig.initStroke.width : startElem.stroke_width,
							'fill': 'none',
							'opacity': curConfig.initStroke.opacity,
							'style': 'pointer-events:none'
						}
					});
					elData(curLine, 'start_bb', bb);
				}
				return {
					started: true
				};
			}
			if (mode === 'select') {
				findConnectors();
			}
		},
		mouseMove: function (opts) {
			var zoom = svgCanvas.getZoom();
			// var e = opts.event;
			var x = opts.mouse_x / zoom;
			var y = opts.mouse_y / zoom;

			var	diffX = x - startX,
				diffY = y - startY;

			var mode = svgCanvas.getMode();

			if (mode === 'connector' && started) {
				// var sw = curLine.getAttribute('stroke-width') * 3;
				// Set start point (adjusts based on bb)
				var pt = getBBintersect(x, y, elData(curLine, 'start_bb'), getOffset('start', curLine));
				startX = pt.x;
				startY = pt.y;

				setPoint(curLine, 0, pt.x, pt.y, true);

				// Set end point
				setPoint(curLine, 'end', x, y, true);
			} else if (mode === 'select') {
				var slen = selElems.length;

				while (slen--) {
					var elem = selElems[slen];
					// Look for selected connector elements
					if (elem && elData(elem, 'c_start')) {
						// Remove the "translate" transform given to move
						svgCanvas.removeFromSelection([elem]);
						svgCanvas.getTransformList(elem).clear();
					}
				}
				if (connections.length) {
					updateLine(diffX, diffY);
				}
			}
		},
		mouseUp: function (opts) {
			// var zoom = svgCanvas.getZoom();
			var e = opts.event,
				// x = opts.mouse_x / zoom,
				// y = opts.mouse_y / zoom,
				mouseTarget = e.target;

			if (svgCanvas.getMode() === 'connector') {
				var fo = $(mouseTarget).closest('foreignObject');
				if (fo.length) { mouseTarget = fo[0]; }

				var parents = $(mouseTarget).parents();

				if (mouseTarget === startElem) {
					// Start line through click
					started = true;
					return {
						keep: true,
						element: null,
						started: started
					};
				}
				if ($.inArray(svgcontent, parents) === -1) {
					// Not a valid target element, so remove line
					$(curLine).remove();
					started = false;
					return {
						keep: false,
						element: null,
						started: started
					};
				}
				// Valid end element
				endElem = mouseTarget;

				var startId = startElem.id, endId = endElem.id;
				var connStr = startId + ' ' + endId;
				var altStr = endId + ' ' + startId;
				// Don't create connector if one already exists
				var dupe = $(svgcontent).find(connSel).filter(function () {
					var conn = this.getAttributeNS(seNs, 'connector');
					if (conn === connStr || conn === altStr) { return true; }
				});
				if (dupe.length) {
					$(curLine).remove();
					return {
						keep: false,
						element: null,
						started: false
					};
				}

				var bb = svgCanvas.getStrokedBBox([endElem]);

				var pt = getBBintersect(startX, startY, bb, getOffset('start', curLine));
				setPoint(curLine, 'end', pt.x, pt.y, true);
				$(curLine)
					.data('c_start', startId)
					.data('c_end', endId)
					.data('end_bb', bb);
				seNs = svgCanvas.getEditorNS(true);
				curLine.setAttributeNS(seNs, 'se:connector', connStr);
				curLine.setAttribute('class', connSel.substr(1));
				curLine.setAttribute('opacity', 1);
				svgCanvas.addToSelection([curLine]);
				svgCanvas.moveToBottomSelectedElement();
				selManager.requestSelector(curLine).showGrips(false);
				started = false;
				return {
					keep: true,
					element: curLine,
					started: started
				};
			}
		},
		selectedChanged: function (opts) {
			// TODO: Find better way to skip operations if no connectors are in use
			if (!$(svgcontent).find(connSel).length) { return; }

			if (svgCanvas.getMode() === 'connector') {
				svgCanvas.setMode('select');
			}

			// Use this to update the current selected elements
			selElems = opts.elems;

			var i = selElems.length;

			while (i--) {
				var elem = selElems[i];
				if (elem && elData(elem, 'c_start')) {
					selManager.requestSelector(elem).showGrips(false);
					if (opts.selectedElement && !opts.multiselected) {
						// TODO: Set up context tools and hide most regular line tools
						showPanel(true);
					} else {
						showPanel(false);
					}
				} else {
					showPanel(false);
				}
			}
			updateConnectors();
		},
		elementChanged: function (opts) {
			var elem = opts.elems[0];
			if (elem && elem.tagName === 'svg' && elem.id === 'svgcontent') {
				// Update svgcontent (can change on import)
				svgcontent = elem;
				init();
			}

			// Has marker, so change offset
			var start;
			if (elem && (
				elem.getAttribute('marker-start') ||
				elem.getAttribute('marker-mid') ||
				elem.getAttribute('marker-end')
			)) {
				start = elem.getAttribute('marker-start');
				var mid = elem.getAttribute('marker-mid');
				var end = elem.getAttribute('marker-end');
				curLine = elem;
				$(elem)
					.data('start_off', !!start)
					.data('end_off', !!end);

				if (elem.tagName === 'line' && mid) {
					// Convert to polyline to accept mid-arrow

					var x1 = Number(elem.getAttribute('x1'));
					var x2 = Number(elem.getAttribute('x2'));
					var y1 = Number(elem.getAttribute('y1'));
					var y2 = Number(elem.getAttribute('y2'));
					var id = elem.id;

					var midPt = (' ' + ((x1 + x2) / 2) + ',' + ((y1 + y2) / 2) + ' ');
					var pline = addElem({
						'element': 'polyline',
						'attr': {
							'points': (x1 + ',' + y1 + midPt + x2 + ',' + y2),
							'stroke': elem.getAttribute('stroke'),
							'stroke-width': elem.getAttribute('stroke-width'),
							'marker-mid': mid,
							'fill': 'none',
							'opacity': elem.getAttribute('opacity') || 1
						}
					});
					$(elem).after(pline).remove();
					svgCanvas.clearSelection();
					pline.id = id;
					svgCanvas.addToSelection([pline]);
					elem = pline;
				}
			}
			// Update line if it's a connector
			if (elem.getAttribute('class') === connSel.substr(1)) {
				start = getElem(elData(elem, 'c_start'));
				updateConnectors([start]);
			} else {
				updateConnectors();
			}
		},
		IDsUpdated: function (input) {
			var remove = [];
			input.elems.forEach(function (elem) {
				if ('se:connector' in elem.attr) {
					elem.attr['se:connector'] = elem.attr['se:connector'].split(' ')
						.map(function (oldID) { return input.changes[oldID]; }).join(' ');

					// Check validity - the field would be something like 'svg_21 svg_22', but
					// if one end is missing, it would be 'svg_21' and therefore fail this test
					if (!/. ./.test(elem.attr['se:connector'])) {
						remove.push(elem.attr.id);
					}
				}
			});
			return {remove: remove};
		},
		toolButtonStateUpdate: function (opts) {
			if (opts.nostroke) {
				if ($('#mode_connect').hasClass('tool_button_current')) {
					svgEditor.clickSelect();
				}
			}
			$('#mode_connect')
				.toggleClass('disabled', opts.nostroke);
		}
	};
});