/* eslint-disable no-var */
/* globals $, svgroot */
/**
 * Coords.
 *
 * Licensed under the MIT License
 *
 */

// Dependencies:
// 1) jquery.js
// 2) math.js
// 3) pathseg.js
// 4) browser.js
// 5) svgutils.js
// 6) units.js
// 7) svgtransformlist.js

var svgedit = svgedit || {}; // eslint-disable-line no-use-before-define

(function () {
'use strict';

if (!svgedit.coords) {
	svgedit.coords = {};
}

// this is how we map paths to our preferred relative segment types
var pathMap = [0, 'z', 'M', 'm', 'L', 'l', 'C', 'c', 'Q', 'q', 'A', 'a',
	'H', 'h', 'V', 'v', 'S', 's', 'T', 't'];

/**
 * @typedef editorContext
 * @type {?object}
 * @property {function} getGridSnapping
 * @property {function} getDrawing
*/
var editorContext_ = null;

/**
* @param {editorContext} editorContext
*/
svgedit.coords.init = function (editorContext) {
	editorContext_ = editorContext;
};

/**
 * Applies coordinate changes to an element based on the given matrix
 * @param {Element} selected - DOM element to be changed
 * @param {object} changes - Object with changes to be remapped
 * @param {SVGMatrix} m - Matrix object to use for remapping coordinates
*/
svgedit.coords.remapElement = function (selected, changes, m) {
	var i, type,
		remap = function (x, y) { return svgedit.math.transformPoint(x, y, m); },
		scalew = function (w) { return m.a * w; },
		scaleh = function (h) { return m.d * h; },
		doSnapping = editorContext_.getGridSnapping() && selected.parentNode.parentNode.localName === 'svg',
		finishUp = function () {
			var o;
			if (doSnapping) {
				for (o in changes) {
					changes[o] = svgedit.utilities.snapToGrid(changes[o]);
				}
			}
			svgedit.utilities.assignAttributes(selected, changes, 1000, true);
		},
		box = svgedit.utilities.getBBox(selected);

	for (i = 0; i < 2; i++) {
		type = i === 0 ? 'fill' : 'stroke';
		var attrVal = selected.getAttribute(type);
		if (attrVal && attrVal.indexOf('url(') === 0) {
			if (m.a < 0 || m.d < 0) {
				var grad = svgedit.utilities.getRefElem(attrVal);
				var newgrad = grad.cloneNode(true);
				if (m.a < 0) {
					// flip x
					var x1 = newgrad.getAttribute('x1');
					var x2 = newgrad.getAttribute('x2');
					newgrad.setAttribute('x1', -(x1 - 1));
					newgrad.setAttribute('x2', -(x2 - 1));
				}

				if (m.d < 0) {
					// flip y
					var y1 = newgrad.getAttribute('y1');
					var y2 = newgrad.getAttribute('y2');
					newgrad.setAttribute('y1', -(y1 - 1));
					newgrad.setAttribute('y2', -(y2 - 1));
				}
				newgrad.id = editorContext_.getDrawing().getNextId();
				svgedit.utilities.findDefs().appendChild(newgrad);
				selected.setAttribute(type, 'url(#' + newgrad.id + ')');
			}

			// Not really working :(
			// if (selected.tagName === 'path') {
			// 	reorientGrads(selected, m);
			// }
		}
	}

	var elName = selected.tagName;
	var chlist, mt;
	if (elName === 'g' || elName === 'text' || elName === 'tspan' || elName === 'use') {
		// if it was a translate, then just update x,y
		if (m.a === 1 && m.b === 0 && m.c === 0 && m.d === 1 && (m.e !== 0 || m.f !== 0)) {
			// [T][M] = [M][T']
			// therefore [T'] = [M_inv][T][M]
			var existing = svgedit.math.transformListToTransform(selected).matrix,
				tNew = svgedit.math.matrixMultiply(existing.inverse(), m, existing);
			changes.x = parseFloat(changes.x) + tNew.e;
			changes.y = parseFloat(changes.y) + tNew.f;
		} else {
			// we just absorb all matrices into the element and don't do any remapping
			chlist = svgedit.transformlist.getTransformList(selected);
			mt = svgroot.createSVGTransform();
			mt.setMatrix(svgedit.math.matrixMultiply(svgedit.math.transformListToTransform(chlist).matrix, m));
			chlist.clear();
			chlist.appendItem(mt);
		}
	}
	var c, pt, pt1, pt2, len;
	// now we have a set of changes and an applied reduced transform list
	// we apply the changes directly to the DOM
	switch (elName) {
	case 'foreignObject':
	case 'rect':
	case 'image':
		// Allow images to be inverted (give them matrix when flipped)
		if (elName === 'image' && (m.a < 0 || m.d < 0)) {
			// Convert to matrix
			chlist = svgedit.transformlist.getTransformList(selected);
			mt = svgroot.createSVGTransform();
			mt.setMatrix(svgedit.math.matrixMultiply(svgedit.math.transformListToTransform(chlist).matrix, m));
			chlist.clear();
			chlist.appendItem(mt);
		} else {
			pt1 = remap(changes.x, changes.y);
			changes.width = scalew(changes.width);
			changes.height = scaleh(changes.height);
			changes.x = pt1.x + Math.min(0, changes.width);
			changes.y = pt1.y + Math.min(0, changes.height);
			changes.width = Math.abs(changes.width);
			changes.height = Math.abs(changes.height);
		}
		finishUp();
		break;
	case 'ellipse':
		c = remap(changes.cx, changes.cy);
		changes.cx = c.x;
		changes.cy = c.y;
		changes.rx = scalew(changes.rx);
		changes.ry = scaleh(changes.ry);
		changes.rx = Math.abs(changes.rx);
		changes.ry = Math.abs(changes.ry);
		finishUp();
		break;
	case 'circle':
		c = remap(changes.cx, changes.cy);
		changes.cx = c.x;
		changes.cy = c.y;
		// take the minimum of the new selected box's dimensions for the new circle radius
		var tbox = svgedit.math.transformBox(box.x, box.y, box.width, box.height, m);
		var w = tbox.tr.x - tbox.tl.x, h = tbox.bl.y - tbox.tl.y;
		changes.r = Math.min(w / 2, h / 2);

		if (changes.r) { changes.r = Math.abs(changes.r); }
		finishUp();
		break;
	case 'line':
		pt1 = remap(changes.x1, changes.y1);
		pt2 = remap(changes.x2, changes.y2);
		changes.x1 = pt1.x;
		changes.y1 = pt1.y;
		changes.x2 = pt2.x;
		changes.y2 = pt2.y;
		// deliberately fall through here
	case 'text':
	case 'tspan':
	case 'use':
		finishUp();
		break;
	case 'g':
		var gsvg = $(selected).data('gsvg');
		if (gsvg) {
			svgedit.utilities.assignAttributes(gsvg, changes, 1000, true);
		}
		break;
	case 'polyline':
	case 'polygon':
		len = changes.points.length;
		for (i = 0; i < len; ++i) {
			pt = changes.points[i];
			pt = remap(pt.x, pt.y);
			changes.points[i].x = pt.x;
			changes.points[i].y = pt.y;
		}

		len = changes.points.length;
		var pstr = '';
		for (i = 0; i < len; ++i) {
			pt = changes.points[i];
			pstr += pt.x + ',' + pt.y + ' ';
		}
		selected.setAttribute('points', pstr);
		break;
	case 'path':
		var seg;
		var segList = selected.pathSegList;
		len = segList.numberOfItems;
		changes.d = [];
		for (i = 0; i < len; ++i) {
			seg = segList.getItem(i);
			changes.d[i] = {
				type: seg.pathSegType,
				x: seg.x,
				y: seg.y,
				x1: seg.x1,
				y1: seg.y1,
				x2: seg.x2,
				y2: seg.y2,
				r1: seg.r1,
				r2: seg.r2,
				angle: seg.angle,
				largeArcFlag: seg.largeArcFlag,
				sweepFlag: seg.sweepFlag
			};
		}

		len = changes.d.length;
		var firstseg = changes.d[0],
			currentpt = remap(firstseg.x, firstseg.y);
		changes.d[0].x = currentpt.x;
		changes.d[0].y = currentpt.y;
		for (i = 1; i < len; ++i) {
			seg = changes.d[i];
			type = seg.type;
			// if absolute or first segment, we want to remap x, y, x1, y1, x2, y2
			// if relative, we want to scalew, scaleh
			if (type % 2 === 0) { // absolute
				var thisx = (seg.x !== undefined) ? seg.x : currentpt.x, // for V commands
					thisy = (seg.y !== undefined) ? seg.y : currentpt.y; // for H commands
				pt = remap(thisx, thisy);
				pt1 = remap(seg.x1, seg.y1);
				pt2 = remap(seg.x2, seg.y2);
				seg.x = pt.x;
				seg.y = pt.y;
				seg.x1 = pt1.x;
				seg.y1 = pt1.y;
				seg.x2 = pt2.x;
				seg.y2 = pt2.y;
				seg.r1 = scalew(seg.r1);
				seg.r2 = scaleh(seg.r2);
			} else { // relative
				seg.x = scalew(seg.x);
				seg.y = scaleh(seg.y);
				seg.x1 = scalew(seg.x1);
				seg.y1 = scaleh(seg.y1);
				seg.x2 = scalew(seg.x2);
				seg.y2 = scaleh(seg.y2);
				seg.r1 = scalew(seg.r1);
				seg.r2 = scaleh(seg.r2);
			}
		} // for each segment

		var dstr = '';
		len = changes.d.length;
		for (i = 0; i < len; ++i) {
			seg = changes.d[i];
			type = seg.type;
			dstr += pathMap[type];
			switch (type) {
			case 13: // relative horizontal line (h)
			case 12: // absolute horizontal line (H)
				dstr += seg.x + ' ';
				break;
			case 15: // relative vertical line (v)
			case 14: // absolute vertical line (V)
				dstr += seg.y + ' ';
				break;
			case 3: // relative move (m)
			case 5: // relative line (l)
			case 19: // relative smooth quad (t)
			case 2: // absolute move (M)
			case 4: // absolute line (L)
			case 18: // absolute smooth quad (T)
				dstr += seg.x + ',' + seg.y + ' ';
				break;
			case 7: // relative cubic (c)
			case 6: // absolute cubic (C)
				dstr += seg.x1 + ',' + seg.y1 + ' ' + seg.x2 + ',' + seg.y2 + ' ' +
					seg.x + ',' + seg.y + ' ';
				break;
			case 9: // relative quad (q)
			case 8: // absolute quad (Q)
				dstr += seg.x1 + ',' + seg.y1 + ' ' + seg.x + ',' + seg.y + ' ';
				break;
			case 11: // relative elliptical arc (a)
			case 10: // absolute elliptical arc (A)
				dstr += seg.r1 + ',' + seg.r2 + ' ' + seg.angle + ' ' + (+seg.largeArcFlag) +
					' ' + (+seg.sweepFlag) + ' ' + seg.x + ',' + seg.y + ' ';
				break;
			case 17: // relative smooth cubic (s)
			case 16: // absolute smooth cubic (S)
				dstr += seg.x2 + ',' + seg.y2 + ' ' + seg.x + ',' + seg.y + ' ';
				break;
			}
		}

		selected.setAttribute('d', dstr);
		break;
	}
};
}());