/**
* Copyright (c) 2020, Leon Sorokin
* All rights reserved. (MIT Licensed)
*
* uPlot.js (μPlot)
* A small, fast chart for time series, lines, areas, ohlc & bars
* https://github.com/leeoniya/uPlot (v1.0.8)
*/

function debounce(fn, time) {
	let pending = null;

	function run() {
		pending = null;
		fn();
	}

	return function() {
		clearTimeout(pending);
		pending = setTimeout(run, time);
	}
}

// binary search for index of closest value
function closestIdx(num, arr, lo, hi) {
	let mid;
	lo = lo || 0;
	hi = hi || arr.length - 1;
	let bitwise = hi <= 2147483647;

	while (hi - lo > 1) {
		mid = bitwise ? (lo + hi) >> 1 : floor((lo + hi) / 2);

		if (arr[mid] < num)
			lo = mid;
		else
			hi = mid;
	}

	if (num - arr[lo] <= arr[hi] - num)
		return lo;

	return hi;
}

function getMinMax(data, _i0, _i1) {
//	console.log("getMinMax()");

	let _min = inf;
	let _max = -inf;

	for (let i = _i0; i <= _i1; i++) {
		if (data[i] != null) {
			_min = min(_min, data[i]);
			_max = max(_max, data[i]);
		}
	}

	return [_min, _max];
}

// this ensures that non-temporal/numeric y-axes get multiple-snapped padding added above/below
// TODO: also account for incrs when snapping to ensure top of axis gets a tick & value
function rangeNum(min, max, mult, extra) {
	// auto-scale Y
	const delta = max - min;
	const mag = log10(delta || abs(max) || 1);
	const exp = floor(mag);
	const incr = pow(10, exp) * mult;
	const buf = delta == 0 ? incr : 0;

	let snappedMin = round6(incrRoundDn(min - buf, incr));
	let snappedMax = round6(incrRoundUp(max + buf, incr));

	if (extra) {
		// for flat data, always use 0 as one chart extreme & place data in center
		if (delta == 0) {
			if (max > 0) {
				snappedMin = 0;
				snappedMax = max * 2;
			}
			else if (max < 0) {
				snappedMax = 0;
				snappedMin = min * 2;
			}
		}
		else {
			// if buffer is too small, increase it
			if (snappedMax - max < incr)
				snappedMax += incr;

			if (min - snappedMin < incr)
				snappedMin -= incr;

			// if original data never crosses 0, use 0 as one chart extreme
			if (min >= 0 && snappedMin < 0)
				snappedMin = 0;

			if (max <= 0 && snappedMax > 0)
				snappedMax = 0;
		}
	}

	return [snappedMin, snappedMax];
}

const M = Math;

const abs = M.abs;
const floor = M.floor;
const round = M.round;
const ceil = M.ceil;
const min = M.min;
const max = M.max;
const pow = M.pow;
const log10 = M.log10;
const PI = M.PI;

const inf = Infinity;

function incrRound(num, incr) {
	return round(num/incr)*incr;
}

function clamp(num, _min, _max) {
	return min(max(num, _min), _max);
}

function fnOrSelf(v) {
	return typeof v == "function" ? v : () => v;
}

function retArg2(a, b) {
	return b;
}

function incrRoundUp(num, incr) {
	return ceil(num/incr)*incr;
}

function incrRoundDn(num, incr) {
	return floor(num/incr)*incr;
}

function round3(val) {
	return round(val * 1e3) / 1e3;
}

function round6(val) {
	return round(val * 1e6) / 1e6;
}

//export const assign = Object.assign;

const isArr = Array.isArray;

function isStr(v) {
	return typeof v === 'string';
}

function isObj(v) {
	return typeof v === 'object' && v !== null;
}

function copy(o) {
	let out;

	if (isArr(o))
		out = o.map(copy);
	else if (isObj(o)) {
		out = {};
		for (var k in o)
			out[k] = copy(o[k]);
	}
	else
		out = o;

	return out;
}

function assign(targ) {
	let args = arguments;

	for (let i = 1; i < args.length; i++) {
		let src = args[i];

		for (let key in src) {
			if (isObj(targ[key]))
				assign(targ[key], copy(src[key]));
			else
				targ[key] = copy(src[key]);
		}
	}

	return targ;
}

const WIDTH = "width";
const HEIGHT = "height";
const TOP = "top";
const BOTTOM = "bottom";
const LEFT = "left";
const RIGHT = "right";
const firstChild = "firstChild";
const createElement = "createElement";
const hexBlack = "#000";
const classList = "classList";

const mousemove = "mousemove";
const mousedown = "mousedown";
const mouseup = "mouseup";
const mouseenter = "mouseenter";
const mouseleave = "mouseleave";
const dblclick = "dblclick";
const resize = "resize";
const scroll = "scroll";

const rAF = requestAnimationFrame;
const doc = document;
const win = window;
const pxRatio = devicePixelRatio;

function addClass(el, c) {
	c != null && el[classList].add(c);
}

function remClass(el, c) {
	el[classList].remove(c);
}

function setStylePx(el, name, value) {
	el.style[name] = value + "px";
}

function placeTag(tag, cls, targ, refEl) {
	let el = doc[createElement](tag);

	if (cls != null)
		addClass(el, cls);

	if (targ != null)
		targ.insertBefore(el, refEl);

	return el;
}

function placeDiv(cls, targ) {
	return placeTag("div", cls, targ);
}

function trans(el, xPos, yPos) {
	el.style.transform = "translate(" + xPos + "px," + yPos + "px)";
}

const evOpts = {passive: true};

function on(ev, el, cb) {
	el.addEventListener(ev, cb, evOpts);
}

function off(ev, el, cb) {
	el.removeEventListener(ev, cb, evOpts);
}

const months = [
	"January",
	"February",
	"March",
	"April",
	"May",
	"June",
	"July",
	"August",
	"September",
	"October",
	"November",
	"December",
];

const days = [
	"Sunday",
	"Monday",
	"Tuesday",
	"Wednesday",
	"Thursday",
	"Friday",
	"Saturday",
];

function slice3(str) {
	return str.slice(0, 3);
}

const days3 =  days.map(slice3);

const months3 =  months.map(slice3);

const engNames = {
	MMMM: months,
	MMM:  months3,
	WWWW: days,
	WWW:  days3,
};

function zeroPad2(int) {
	return (int < 10 ? '0' : '') + int;
}

function zeroPad3(int) {
	return (int < 10 ? '00' : int < 100 ? '0' : '') + int;
}

/*
function suffix(int) {
	let mod10 = int % 10;

	return int + (
		mod10 == 1 && int != 11 ? "st" :
		mod10 == 2 && int != 12 ? "nd" :
		mod10 == 3 && int != 13 ? "rd" : "th"
	);
}
*/

const getFullYear = 'getFullYear';
const getMonth = 'getMonth';
const getDate = 'getDate';
const getDay = 'getDay';
const getHours = 'getHours';
const getMinutes = 'getMinutes';
const getSeconds = 'getSeconds';
const getMilliseconds = 'getMilliseconds';

const subs = {
	// 2019
	YYYY:	d => d[getFullYear](),
	// 19
	YY:		d => (d[getFullYear]()+'').slice(2),
	// July
	MMMM:	(d, names) => names.MMMM[d[getMonth]()],
	// Jul
	MMM:	(d, names) => names.MMM[d[getMonth]()],
	// 07
	MM:		d => zeroPad2(d[getMonth]()+1),
	// 7
	M:		d => d[getMonth]()+1,
	// 09
	DD:		d => zeroPad2(d[getDate]()),
	// 9
	D:		d => d[getDate](),
	// Monday
	WWWW:	(d, names) => names.WWWW[d[getDay]()],
	// Mon
	WWW:	(d, names) => names.WWW[d[getDay]()],
	// 03
	HH:		d => zeroPad2(d[getHours]()),
	// 3
	H:		d => d[getHours](),
	// 9 (12hr, unpadded)
	h:		d => {let h = d[getHours](); return h == 0 ? 12 : h > 12 ? h - 12 : h;},
	// AM
	AA:		d => d[getHours]() >= 12 ? 'PM' : 'AM',
	// am
	aa:		d => d[getHours]() >= 12 ? 'pm' : 'am',
	// a
	a:		d => d[getHours]() >= 12 ? 'p' : 'a',
	// 09
	mm:		d => zeroPad2(d[getMinutes]()),
	// 9
	m:		d => d[getMinutes](),
	// 09
	ss:		d => zeroPad2(d[getSeconds]()),
	// 9
	s:		d => d[getSeconds](),
	// 374
	fff:	d => zeroPad3(d[getMilliseconds]()),
};

function fmtDate(tpl, names) {
	names = names || engNames;
	let parts = [];

	let R = /\{([a-z]+)\}|[^{]+/gi, m;

	while (m = R.exec(tpl))
		parts.push(m[0][0] == '{' ? subs[m[1]] : m[0]);

	return d => {
		let out = '';

		for (let i = 0; i < parts.length; i++)
			out += typeof parts[i] == "string" ? parts[i] : parts[i](d, names);

		return out;
	}
}

// https://stackoverflow.com/questions/15141762/how-to-initialize-a-javascript-date-to-a-particular-time-zone/53652131#53652131
function tzDate(date, tz) {
	let date2 = new Date(date.toLocaleString('en-US', {timeZone: tz}));
	date2.setMilliseconds(date[getMilliseconds]());
	return date2;
}

//export const series = [];

// default formatters:

function genIncrs(minExp, maxExp, mults) {
	let incrs = [];

	for (let exp = minExp; exp < maxExp; exp++) {
		for (let i = 0; i < mults.length; i++) {
			let incr = mults[i] * pow(10, exp);
			incrs.push(+incr.toFixed(abs(exp)));
		}
	}

	return incrs;
}

const incrMults = [1,2,5];

const decIncrs = genIncrs(-12, 0, incrMults);

const intIncrs = genIncrs(0, 12, incrMults);

const numIncrs = decIncrs.concat(intIncrs);

let s = 1,
	m = 60,
	h = m * m,
	d = h * 24,
	mo = d * 30,
	y = d * 365;

// starting below 1e-3 is a hack to allow the incr finder to choose & bail out at incr < 1ms
const timeIncrs =  [5e-4].concat(genIncrs(-3, 0, incrMults), [
	// minute divisors (# of secs)
	1,
	5,
	10,
	15,
	30,
	// hour divisors (# of mins)
	m,
	m * 5,
	m * 10,
	m * 15,
	m * 30,
	// day divisors (# of hrs)
	h,
	h * 2,
	h * 3,
	h * 4,
	h * 6,
	h * 8,
	h * 12,
	// month divisors TODO: need more?
	d,
	d * 2,
	d * 3,
	d * 4,
	d * 5,
	d * 6,
	d * 7,
	d * 8,
	d * 9,
	d * 10,
	d * 15,
	// year divisors (# months, approx)
	mo,
	mo * 2,
	mo * 3,
	mo * 4,
	mo * 6,
	// century divisors
	y,
	y * 2,
	y * 5,
	y * 10,
	y * 25,
	y * 50,
	y * 100,
]);

function timeAxisStamps(stampCfg, fmtDate) {
	return stampCfg.map(s => [
		s[0],
		fmtDate(s[1]),
		s[2],
		fmtDate(s[4] ? s[1] + s[3] : s[3]),
	]);
}

const yyyy = "{YYYY}";
const NLyyyy = "\n" + yyyy;
const md = "{M}/{D}";
const NLmd = "\n" + md;

const aa = "{aa}";
const hmm = "{h}:{mm}";
const hmmaa = hmm + aa;
const ss = ":{ss}";

// [0]: minimum num secs in the tick incr
// [1]: normal tick format
// [2]: when a differing <x> is encountered - 1: sec, 2: min, 3: hour, 4: day, 5: week, 6: month, 7: year
// [3]: use a longer more contextual format
// [4]: modes: 0: replace [1] -> [3], 1: concat [1] + [3]
const _timeAxisStamps = [
	[y,        yyyy,            7,   "",                    1],
	[d * 28,   "{MMM}",         7,   NLyyyy,                1],
	[d,        md,              7,   NLyyyy,                1],
	[h,        "{h}" + aa,      4,   NLmd,                  1],
	[m,        hmmaa,           4,   NLmd,                  1],
	[s,        ss,              2,   NLmd  + " " + hmmaa,   1],
	[1e-3,     ss + ".{fff}",   2,   NLmd  + " " + hmmaa,   1],
];

// TODO: will need to accept spaces[] and pull incr into the loop when grid will be non-uniform, eg for log scales.
// currently we ignore this for months since they're *nearly* uniform and the added complexity is not worth it
function timeAxisVals(tzDate, stamps) {
	return (self, splits, space, incr) => {
		let s = stamps.find(e => incr >= e[0]);

		// these track boundaries when a full label is needed again
		let prevYear = null;
		let prevDate = null;
		let prevMinu = null;

		return splits.map((split, i) => {
			let date = tzDate(split);

			let newYear = date[getFullYear]();
			let newDate = date[getDate]();
			let newMinu = date[getMinutes]();

			let diffYear = newYear != prevYear;
			let diffDate = newDate != prevDate;
			let diffMinu = newMinu != prevMinu;

			let stamp = s[2] == 7 && diffYear || s[2] == 4 && diffDate || s[2] == 2 && diffMinu ? s[3] : s[1];

			prevYear = newYear;
			prevDate = newDate;
			prevMinu = newMinu;

			return stamp(date);
		});
	}
}

function mkDate(y, m, d) {
	return new Date(y, m, d);
}

// the ensures that axis ticks, values & grid are aligned to logical temporal breakpoints and not an arbitrary timestamp
// https://www.timeanddate.com/time/dst/
// https://www.timeanddate.com/time/dst/2019.html
// https://www.epochconverter.com/timezones
function timeAxisSplits(tzDate) {
	return (self, scaleMin, scaleMax, incr, pctSpace) => {
		let splits = [];
		let isMo = incr >= mo && incr < y;

		// get the timezone-adjusted date
		let minDate = tzDate(scaleMin);
		let minDateTs = minDate / 1e3;

		// get ts of 12am (this lands us at or before the original scaleMin)
		let minMin = mkDate(minDate[getFullYear](), minDate[getMonth](), isMo ? 1 : minDate[getDate]());
		let minMinTs = minMin / 1e3;

		if (isMo) {
			let moIncr = incr / mo;
		//	let tzOffset = scaleMin - minDateTs;		// needed?
			let split = minDateTs == minMinTs ? minDateTs : mkDate(minMin[getFullYear](), minMin[getMonth]() + moIncr, 1) / 1e3;
			let splitDate = new Date(split * 1e3);
			let baseYear = splitDate[getFullYear]();
			let baseMonth = splitDate[getMonth]();

			for (let i = 0; split <= scaleMax; i++) {
				let next = mkDate(baseYear, baseMonth + moIncr * i, 1);
				let offs = next - tzDate(next / 1e3);

				split = (+next + offs) / 1e3;

				if (split <= scaleMax)
					splits.push(split);
			}
		}
		else {
			let incr0 = incr >= d ? d : incr;
			let tzOffset = floor(scaleMin) - floor(minDateTs);
			let split = minMinTs + tzOffset + incrRoundUp(minDateTs - minMinTs, incr0);
			splits.push(split);

			let date0 = tzDate(split);

			let prevHour = date0[getHours]() + (date0[getMinutes]() / m) + (date0[getSeconds]() / h);
			let incrHours = incr / h;

			while (1) {
				split = round3(split + incr);

				let expectedHour = floor(round6(prevHour + incrHours)) % 24;
				let splitDate = tzDate(split);
				let actualHour = splitDate.getHours();

				let dstShift = actualHour - expectedHour;

				if (dstShift > 1)
					dstShift = -1;

				split -= dstShift * h;

				if (split > scaleMax)
					break;

				prevHour = (prevHour + incrHours) % 24;

				// add a tick only if it's further than 70% of the min allowed label spacing
				let prevSplit = splits[splits.length - 1];
				let pctIncr = round3((split - prevSplit) / incr);

				if (pctIncr * pctSpace >= .7)
					splits.push(split);
			}
		}

		return splits;
	}
}

function timeSeriesStamp(stampCfg, fmtDate) {
	return fmtDate(stampCfg);
}
const _timeSeriesStamp = '{YYYY}-{MM}-{DD} {h}:{mm}{aa}';

function timeSeriesVal(tzDate, stamp) {
	return (self, val) => stamp(tzDate(val));
}

function cursorPoint(self, si) {
	let s = self.series[si];

	let pt = placeDiv();

	pt.style.background = s.stroke || hexBlack;

	let dia = ptDia(s.width, 1);
	let mar = (dia - 1) / -2;

	setStylePx(pt, WIDTH, dia);
	setStylePx(pt, HEIGHT, dia);
	setStylePx(pt, "marginLeft", mar);
	setStylePx(pt, "marginTop", mar);

	return pt;
}

const cursorOpts = {
	show: true,
	x: true,
	y: true,
	lock: false,
	points: {
		show: cursorPoint,
	},

	drag: {
		setScale: true,
		x: true,
		y: false,
	},

	focus: {
		prox: -1,
	},

	locked: false,
	left: -10,
	top: -10,
	idx: null,
};

const grid = {
	show: true,
	stroke: "rgba(0,0,0,0.07)",
	width: 2,
//	dash: [],
};

const ticks = assign({}, grid, {size: 10});

const font      = '12px -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans", sans-serif, "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol", "Noto Color Emoji"';
const labelFont = "bold " + font;
const lineMult = 1.5;		// font-size multiplier

const xAxisOpts = {
	type: "x",
	show: true,
	scale: "x",
	space: 50,
	gap: 5,
	size: 50,
	labelSize: 30,
	labelFont,
	side: 2,
//	class: "x-vals",
//	incrs: timeIncrs,
//	values: timeVals,
	grid,
	ticks,
	font,
	rotate: 0,
};

const numSeriesLabel = "Value";
const timeSeriesLabel = "Time";

const xSeriesOpts = {
	show: true,
	scale: "x",
//	label: "Time",
//	value: v => stamp(new Date(v * 1e3)),

	// internal caches
	min: inf,
	max: -inf,
	idxs: [],
};

// alternative: https://stackoverflow.com/a/2254896
let fmtNum = new Intl.NumberFormat(navigator.language);

function numAxisVals(self, splits, space, incr) {
	return splits.map(fmtNum.format);
}

function numAxisSplits(self, scaleMin, scaleMax, incr, pctSpace, forceMin) {
	scaleMin = forceMin ? scaleMin : +incrRoundUp(scaleMin, incr).toFixed(12);

	let splits = [];

	for (let val = scaleMin; val <= scaleMax; val = +(val + incr).toFixed(12))
		splits.push(val);

	return splits;
}

function numSeriesVal(self, val) {
	return val;
}

const yAxisOpts = {
	type: "y",
	show: true,
	scale: "y",
	space: 40,
	gap: 5,
	size: 50,
	labelSize: 30,
	labelFont,
	side: 3,
//	class: "y-vals",
//	incrs: numIncrs,
//	values: (vals, space) => vals,
	grid,
	ticks,
	font,
	rotate: 0,
};

// takes stroke width
function ptDia(width, mult) {
	return max(round3(5 * mult), round3(width * mult) * 2 - 1);
}

function seriesPoints(self, si) {
	const dia = ptDia(self.series[si].width, pxRatio);
	let maxPts = self.bbox.width / dia / 2;
	let idxs = self.series[0].idxs;
	return idxs[1] - idxs[0] <= maxPts;
}

const ySeriesOpts = {
//	type: "n",
	scale: "y",
	show: true,
	band: false,
	alpha: 1,
	points: {
		show: seriesPoints,
	//	stroke: "#000",
	//	fill: "#fff",
	//	width: 1,
	//	size: 10,
	},
//	label: "Value",
//	value: v => v,
	values: null,

	// internal caches
	min: inf,
	max: -inf,
	idxs: [],

	path: null,
	clip: null,
};

const xScaleOpts = {
	time: true,
	auto: false,
	distr: 1,
	min:  inf,
	max: -inf,
};

const yScaleOpts = assign({}, xScaleOpts, {
	time: false,
	auto: true,
});

const syncs = {};

function _sync(opts) {
	let clients = [];

	return {
		sub(client) {
			clients.push(client);
		},
		unsub(client) {
			clients = clients.filter(c => c != client);
		},
		pub(type, self, x, y, w, h, i) {
			if (clients.length > 1) {
				clients.forEach(client => {
					client != self && client.pub(type, self, x, y, w, h, i);
				});
			}
		}
	};
}

function setDefaults(d, xo, yo) {
	return [d[0], d[1]].concat(d.slice(2)).map((o, i) => setDefault(o, i, xo, yo));
}

function setDefault(o, i, xo, yo) {
	return assign({}, (i == 0 || o && o.side % 2 == 0 ? xo : yo), o);
}

function getYPos(val, scale, hgt, top) {
	let pctY = (val - scale.min) / (scale.max - scale.min);
	return top + (1 - pctY) * hgt;
}

function getXPos(val, scale, wid, lft) {
	let pctX = (val - scale.min) / (scale.max - scale.min);
	return lft + pctX * wid;
}

function snapTimeX(self, dataMin, dataMax) {
	return [dataMin, dataMax > dataMin ? dataMax : dataMax + 86400];
}

function snapNumX(self, dataMin, dataMax) {
	const delta = dataMax - dataMin;

	if (delta == 0) {
		const mag = log10(delta || abs(dataMax) || 1);
		const exp = floor(mag) + 1;
		return [dataMin, incrRoundUp(dataMax, pow(10, exp))];
	}
	else
		return [dataMin, dataMax];
}

// this ensures that non-temporal/numeric y-axes get multiple-snapped padding added above/below
// TODO: also account for incrs when snapping to ensure top of axis gets a tick & value
function snapNumY(self, dataMin, dataMax) {
	return rangeNum(dataMin, dataMax, 0.2, true);
}

// dim is logical (getClientBoundingRect) pixels, not canvas pixels
function findIncr(valDelta, incrs, dim, minSpace) {
	let pxPerUnit = dim / valDelta;

	for (var i = 0; i < incrs.length; i++) {
		let space = incrs[i] * pxPerUnit;

		if (space >= minSpace)
			return [incrs[i], space];
	}
}

function filtMouse(e) {
	return e.button == 0;
}

function pxRatioFont(font) {
	let fontSize;
	font = font.replace(/\d+/, m => (fontSize = round(m * pxRatio)));
	return [font, fontSize];
}

function uPlot(opts, data, then) {
	const self = {};

	const root = self.root = placeDiv("uplot");

	if (opts.id != null)
		root.id = opts.id;

	addClass(root, opts.class);

	if (opts.title) {
		let title = placeDiv("title", root);
		title.textContent = opts.title;
	}

	const can = placeTag("canvas");
	const ctx = self.ctx = can.getContext("2d");

	const wrap = placeDiv("wrap", root);
	const under = placeDiv("under", wrap);
	wrap.appendChild(can);
	const over = placeDiv("over", wrap);

	opts = copy(opts);

	(opts.plugins || []).forEach(p => {
		if (p.opts)
			opts = p.opts(self, opts) || opts;
	});

	let ready = false;

	const series  = setDefaults(opts.series, xSeriesOpts, ySeriesOpts);
	const axes    = setDefaults(opts.axes || [], xAxisOpts, yAxisOpts);
	const scales  = (opts.scales = opts.scales || {});

	const gutters = assign({
		x: round(yAxisOpts.size / 2),
		y: round(xAxisOpts.size / 3),
	}, opts.gutters);

//	self.tz = opts.tz || Intl.DateTimeFormat().resolvedOptions().timeZone;
	const _tzDate  =  (opts.tzDate || (ts => new Date(ts * 1e3)));
	const _fmtDate =  (opts.fmtDate || fmtDate);

	const _timeAxisSplits =  timeAxisSplits(_tzDate);
	const _timeAxisVals   =  timeAxisVals(_tzDate, timeAxisStamps(_timeAxisStamps, _fmtDate));
	const _timeSeriesVal  =  timeSeriesVal(_tzDate, timeSeriesStamp(_timeSeriesStamp, _fmtDate));

	self.series = series;
	self.axes = axes;
	self.scales = scales;

	const pendScales = {};

	// explicitly-set initial scales
	for (let k in scales) {
		let sc = scales[k];

		if (sc.min != null || sc.max != null)
			pendScales[k] = {min: sc.min, max: sc.max};
	}

	const legend     =  assign({show: true}, opts.legend);
	const showLegend =  legend.show;

	let legendEl;
	let legendRows = [];
	let legendCols;
	let multiValLegend = false;

	if (showLegend) {
		legendEl = placeTag("table", "legend", root);

		const getMultiVals = series[1].values;
		multiValLegend = getMultiVals != null;

		if (multiValLegend) {
			let head = placeTag("tr", "labels", legendEl);
			placeTag("th", null, head);
			legendCols = getMultiVals(self, 1, 0);

			for (var key in legendCols)
				placeTag("th", null, head).textContent = key;
		}
		else {
			legendCols = {_: 0};
			addClass(legendEl, "inline");
		}
	}

	function initLegendRow(s, i) {
		if (i == 0 && multiValLegend)
			return null;

		let _row = [];

		let row = placeTag("tr", "series", legendEl, legendEl.childNodes[i]);

		addClass(row, s.class);

		if (!s.show)
			addClass(row, "off");

		let label = placeTag("th", null, row);

		let indic = placeDiv("ident", label);
		s.width && (indic.style.borderColor = s.stroke);
		indic.style.backgroundColor = s.fill;

		let text = placeDiv("text", label);
		text.textContent = s.label;

		if (i > 0) {
			on("click", label, e => {
				if ( cursor.locked)
					return;

				filtMouse(e) && setSeries(series.indexOf(s), {show: !s.show},  syncOpts.setSeries);
			});

			if (cursorFocus) {
				on(mouseenter, label, e => {
					if (cursor.locked)
						return;

					setSeries(series.indexOf(s), {focus: true}, syncOpts.setSeries);
				});
			}
		}

		for (var key in legendCols) {
			let v = placeTag("td", null, row);
			v.textContent = "--";
			_row.push(v);
		}

		return _row;
	}

	const cursor =  (self.cursor = assign({}, cursorOpts, opts.cursor));

	 (cursor.points.show = fnOrSelf(cursor.points.show));

	const focus = self.focus = assign({}, opts.focus || {alpha: 0.3},  cursor.focus);
	const cursorFocus =  focus.prox >= 0;

	// series-intersection markers
	let cursorPts = [null];

	function initCursorPt(s, si) {
		if (si > 0) {
			let pt = cursor.points.show(self, si);

			if (pt) {
				addClass(pt, "cursor-pt");
				addClass(pt, s.class);
				trans(pt, -10, -10);
				over.insertBefore(pt, cursorPts[si]);

				return pt;
			}
		}
	}

	function initSeries(s, i) {
		// init scales & defaults
		const scKey = s.scale;

		const sc = scales[scKey] = assign({}, (i == 0 ? xScaleOpts : yScaleOpts), scales[scKey]);

		let isTime =  sc.time;

		sc.range = fnOrSelf(sc.range || (isTime ? snapTimeX : i == 0 ? snapNumX : snapNumY));

		s.spanGaps = s.spanGaps === true ? retArg2 : fnOrSelf(s.spanGaps || []);

		let sv = s.value;
		s.value = isTime ? (isStr(sv) ? timeSeriesVal(_tzDate, timeSeriesStamp(sv, _fmtDate)) : sv || _timeSeriesVal) : sv || numSeriesVal;
		s.label = s.label || (isTime ? timeSeriesLabel : numSeriesLabel);

		if (i > 0) {
			s.width = s.width == null ? 1 : s.width;
			s.paths = s.paths || ( buildPaths);
			let _ptDia = ptDia(s.width, 1);
			s.points = assign({}, {
				size: _ptDia,
				width: max(1, _ptDia * .2),
			}, s.points);
			s.points.show = fnOrSelf(s.points.show);
			s._paths = null;
		}

		if (showLegend)
			legendRows.splice(i, 0, initLegendRow(s, i));

		if ( cursor.show) {
			let pt = initCursorPt(s, i);
			pt && cursorPts.splice(i, 0, pt);
		}
	}

	function addSeries(opts, si) {
		si = si == null ? series.length : si;

		opts = setDefault(opts, si, xSeriesOpts, ySeriesOpts);
		series.splice(si, 0, opts);
		initSeries(series[si], si);
	}

	self.addSeries = addSeries;

	function delSeries(i) {
		series.splice(i, 1);
		 legendRows.splice(i, 1)[0][0].parentNode.remove();
		 cursorPts.splice(i, 1)[0].remove();

		// TODO: de-init no-longer-needed scales?
	}

	self.delSeries = delSeries;

	series.forEach(initSeries);

	// dependent scales inherit
	for (let k in scales) {
		let sc = scales[k];

		if (sc.from != null)
			scales[k] = assign({}, scales[sc.from], sc);
	}

	const xScaleKey = series[0].scale;
	const xScaleDistr = scales[xScaleKey].distr;

	function initAxis(axis, i) {
		if (axis.show) {
			let isVt = axis.side % 2;

			let sc = scales[axis.scale];

			// this can occur if all series specify non-default scales
			if (sc == null) {
				axis.scale = isVt ? series[1].scale : xScaleKey;
				sc = scales[axis.scale];
			}

			// also set defaults for incrs & values based on axis distr
			let isTime =  sc.time;

			axis.space = fnOrSelf(axis.space);
			axis.rotate = fnOrSelf(axis.rotate);
			axis.incrs = fnOrSelf(axis.incrs || (          sc.distr == 2 ? intIncrs : (isTime ? timeIncrs : numIncrs)));
			axis.split = fnOrSelf(axis.split || (isTime && sc.distr == 1 ? _timeAxisSplits : numAxisSplits));
			let av = axis.values;
			axis.values = isTime ? (isArr(av) ? timeAxisVals(_tzDate, timeAxisStamps(av, _fmtDate)) : av || _timeAxisVals) : av || numAxisVals;

			axis.font      = pxRatioFont(axis.font);
			axis.labelFont = pxRatioFont(axis.labelFont);
		}
	}

	// set axis defaults
	axes.forEach(initAxis);

	let dataLen;

	// rendered data window
	let i0 = null;
	let i1 = null;
	const idxs = series[0].idxs;

	let data0 = null;

	function setData(_data, _resetScales) {
		self.data = _data;
		data = _data.slice();
		data0 = data[0];
		dataLen = data0.length;

		if (xScaleDistr == 2)
			data[0] = data0.map((v, i) => i);

		resetYSeries();

		fire("setData");

		_resetScales !== false && autoScaleX();
	}

	self.setData = setData;

	function autoScaleX() {
		i0 = idxs[0] = 0;
		i1 = idxs[1] = dataLen - 1;

		let _min = xScaleDistr == 2 ? i0 : data[0][i0],
			_max = xScaleDistr == 2 ? i1 : data[0][i1];

		_setScale(xScaleKey, _min, _max);
	}

	function setCtxStyle(stroke, width, dash, fill) {
		ctx.strokeStyle = stroke || hexBlack;
		ctx.lineWidth = width;
		ctx.lineJoin = "round";
		ctx.setLineDash(dash || []);
		ctx.fillStyle = fill || hexBlack;
	}

	let fullWidCss;
	let fullHgtCss;

	let plotWidCss;
	let plotHgtCss;

	// plot margins to account for axes
	let plotLftCss;
	let plotTopCss;

	let plotLft;
	let plotTop;
	let plotWid;
	let plotHgt;

	self.bbox = {};

	function _setSize(width, height) {
		self.width  = fullWidCss = plotWidCss = width;
		self.height = fullHgtCss = plotHgtCss = height;
		plotLftCss  = plotTopCss = 0;

		calcPlotRect();
		calcAxesRects();

		let bb = self.bbox;

		plotLft = bb[LEFT]   = incrRound(plotLftCss * pxRatio, 0.5);
		plotTop = bb[TOP]    = incrRound(plotTopCss * pxRatio, 0.5);
		plotWid = bb[WIDTH]  = incrRound(plotWidCss * pxRatio, 0.5);
		plotHgt = bb[HEIGHT] = incrRound(plotHgtCss * pxRatio, 0.5);

		setStylePx(under, LEFT,   plotLftCss);
		setStylePx(under, TOP,    plotTopCss);
		setStylePx(under, WIDTH,  plotWidCss);
		setStylePx(under, HEIGHT, plotHgtCss);

		setStylePx(over, LEFT,    plotLftCss);
		setStylePx(over, TOP,     plotTopCss);
		setStylePx(over, WIDTH,   plotWidCss);
		setStylePx(over, HEIGHT,  plotHgtCss);

		setStylePx(wrap, WIDTH,   fullWidCss);
		setStylePx(wrap, HEIGHT,  fullHgtCss);

		can[WIDTH]  = round(fullWidCss * pxRatio);
		can[HEIGHT] = round(fullHgtCss * pxRatio);

		syncRect();

		ready && _setScale(xScaleKey, scales[xScaleKey].min, scales[xScaleKey].max);

		ready && fire("setSize");
	}

	function setSize({width, height}) {
		_setSize(width, height);
	}

	self.setSize = setSize;

	// accumulate axis offsets, reduce canvas width
	function calcPlotRect() {
		// easements for edge labels
		let hasTopAxis = false;
		let hasBtmAxis = false;
		let hasRgtAxis = false;
		let hasLftAxis = false;

		axes.forEach((axis, i) => {
			if (axis.show) {
				let {side, size} = axis;
				let isVt = side % 2;
				let labelSize = axis.labelSize = (axis.label != null ? (axis.labelSize || 30) : 0);

				let fullSize = size + labelSize;

				if (fullSize > 0) {
					if (isVt) {
						plotWidCss -= fullSize;

						if (side == 3) {
							plotLftCss += fullSize;
							hasLftAxis = true;
						}
						else
							hasRgtAxis = true;
					}
					else {
						plotHgtCss -= fullSize;

						if (side == 0) {
							plotTopCss += fullSize;
							hasTopAxis = true;
						}
						else
							hasBtmAxis = true;
					}
				}
			}
		});

		// hz gutters
		if (hasTopAxis || hasBtmAxis) {
			if (!hasRgtAxis)
				plotWidCss -= gutters.x;
			if (!hasLftAxis) {
				plotWidCss -= gutters.x;
				plotLftCss += gutters.x;
			}
		}

		// vt gutters
		if (hasLftAxis || hasRgtAxis) {
			if (!hasBtmAxis)
				plotHgtCss -= gutters.y;
			if (!hasTopAxis) {
				plotHgtCss -= gutters.y;
				plotTopCss += gutters.y;
			}
		}
	}

	function calcAxesRects() {
		// will accum +
		let off1 = plotLftCss + plotWidCss;
		let off2 = plotTopCss + plotHgtCss;
		// will accum -
		let off3 = plotLftCss;
		let off0 = plotTopCss;

		function incrOffset(side, size) {

			switch (side) {
				case 1: off1 += size; return off1 - size;
				case 2: off2 += size; return off2 - size;
				case 3: off3 -= size; return off3 + size;
				case 0: off0 -= size; return off0 + size;
			}
		}

		axes.forEach((axis, i) => {
			let side = axis.side;

			axis._pos = incrOffset(side, axis.size);

			if (axis.label != null)
				axis._lpos = incrOffset(side, axis.labelSize);
		});
	}

	function setScales() {
		if (inBatch) {
			shouldSetScales = true;
			return;
		}

	//	log("setScales()", arguments);

		if (dataLen > 0) {
			// wip scales
			let wipScales = copy(scales);

			for (let k in wipScales) {
				let wsc = wipScales[k];
				let psc = pendScales[k];

				if (psc != null) {
					assign(wsc, psc);

					// explicitly setting the x-scale invalidates everything (acts as redraw)
					if (k == xScaleKey)
						resetYSeries();
				}
				else if (k != xScaleKey) {
					wsc.min = inf;
					wsc.max = -inf;
				}
			}

			// pre-range y-scales from y series' data values
			series.forEach((s, i) => {
				let k = s.scale;
				let wsc = wipScales[k];

				// setting the x scale invalidates everything
				if (i == 0) {
					let minMax = wsc.range(self, wsc.min, wsc.max);

					wsc.min = minMax[0];
					wsc.max = minMax[1];

					i0 = closestIdx(wsc.min, data[0]);
					i1 = closestIdx(wsc.max, data[0]);

					// closest indices can be outside of view
					if (data[0][i0] < wsc.min)
						i0++;
					if (data[0][i1] > wsc.max)
						i1--;

					s.min = data0[i0];
					s.max = data0[i1];
				}
				else if (s.show && pendScales[k] == null) {
					// only run getMinMax() for invalidated series data, else reuse
					let minMax = s.min == inf ? (wsc.auto ? getMinMax(data[i], i0, i1) : [0,100]) : [s.min, s.max];

					// initial min/max
					wsc.min = min(wsc.min, s.min = minMax[0]);
					wsc.max = max(wsc.max, s.max = minMax[1]);
				}

				s.idxs[0] = i0;
				s.idxs[1] = i1;
			});

			// range independent scales
			for (let k in wipScales) {
				let wsc = wipScales[k];

				if (wsc.from == null && wsc.min != inf && pendScales[k] == null) {
					let minMax = wsc.range(self, wsc.min, wsc.max);
					wsc.min = minMax[0];
					wsc.max = minMax[1];
				}
			}

			// range dependent scales
			for (let k in wipScales) {
				let wsc = wipScales[k];

				if (wsc.from != null) {
					let base = wipScales[wsc.from];

					if (base.min != inf) {
						let minMax = wsc.range(self, base.min, base.max);
						wsc.min = minMax[0];
						wsc.max = minMax[1];
					}
				}
			}

			let changed = {};

			for (let k in wipScales) {
				let wsc = wipScales[k];
				let sc = scales[k];

				if (sc.min != wsc.min || sc.max != wsc.max) {
					sc.min = wsc.min;
					sc.max = wsc.max;
					changed[k] = true;
				}

				pendScales[k] = null;
			}

			// invalidate paths of all series on changed scales
			series.forEach(s => {
				if (changed[s.scale])
					s._paths = null;
			});

			for (let k in changed)
				fire("setScale", k);
		}

		 cursor.show && updateCursor();
	}

	// TODO: drawWrap(si, drawPoints) (save, restore, translate, clip)

	function drawPoints(si) {
	//	log("drawPoints()", arguments);

		let s = series[si];
		let p = s.points;

		const width = round3(s[WIDTH] * pxRatio);
		const offset = (width % 2) / 2;
		const isStroked = p.width > 0;

		let rad = (p.size - p.width) / 2 * pxRatio;
		let dia = round3(rad * 2);

		ctx.translate(offset, offset);

		ctx.save();

		ctx.beginPath();
		ctx.rect(
			plotLft - dia,
			plotTop - dia,
			plotWid + dia * 2,
			plotHgt + dia * 2,
		);
		ctx.clip();

		ctx.globalAlpha = s.alpha;

		const path = new Path2D();

		for (let pi = i0; pi <= i1; pi++) {
			if (data[si][pi] != null) {
				let x = round(getXPos(data[0][pi],  scales[xScaleKey], plotWid, plotLft));
				let y = round(getYPos(data[si][pi], scales[s.scale],   plotHgt, plotTop));

				path.moveTo(x + rad, y);
				path.arc(x, y, rad, 0, PI * 2);
			}
		}

		setCtxStyle(
			p.stroke || s.stroke || hexBlack,
			width,
			null,
			p.fill || (isStroked ? "#fff" : s.stroke || hexBlack),
		);

		ctx.fill(path);
		isStroked && ctx.stroke(path);

		ctx.globalAlpha = 1;

		ctx.restore();

		ctx.translate(-offset, -offset);
	}

	// grabs the nearest indices with y data outside of x-scale limits
	function getOuterIdxs(ydata) {
		let _i0 = clamp(i0 - 1, 0, dataLen - 1);
		let _i1 = clamp(i1 + 1, 0, dataLen - 1);

		while (ydata[_i0] == null && _i0 > 0)
			_i0--;

		while (ydata[_i1] == null && _i1 < dataLen - 1)
			_i1++;

		return [_i0, _i1];
	}

	let dir = 1;

	function drawSeries() {
		// path building loop must be before draw loop to ensure that all bands are fully constructed
		series.forEach((s, i) => {
			if (i > 0 && s.show && s._paths == null) {
				let _idxs = getOuterIdxs(data[i]);
				s._paths = s.paths(self, i, _idxs[0], _idxs[1]);
			}
		});

		series.forEach((s, i) => {
			if (i > 0 && s.show) {
				if (s._paths)
					 drawPath(i);

				if (s.points.show(self, i, i0, i1))
					 drawPoints(i);

				fire("drawSeries", i);
			}
		});
	}

	function drawPath(si) {
		const s = series[si];

		if (dir == 1) {
			const { stroke, fill, clip } = s._paths;
			const width = round3(s[WIDTH] * pxRatio);
			const offset = (width % 2) / 2;

			setCtxStyle(s.stroke, width, s.dash, s.fill);

			ctx.globalAlpha = s.alpha;

			ctx.translate(offset, offset);

			ctx.save();

			let lft = plotLft,
				top = plotTop,
				wid = plotWid,
				hgt = plotHgt;

			let halfWid = width * pxRatio / 2;

			if (s.min == 0)
				hgt += halfWid;

			if (s.max == 0) {
				top -= halfWid;
				hgt += halfWid;
			}

			ctx.beginPath();
			ctx.rect(lft, top, wid, hgt);
			ctx.clip();

			if (clip != null)
				ctx.clip(clip);

			if (s.band) {
				ctx.fill(stroke);
				width && ctx.stroke(stroke);
			}
			else {
				width && ctx.stroke(stroke);

				if (s.fill != null)
					ctx.fill(fill);
			}

			ctx.restore();

			ctx.translate(-offset, -offset);

			ctx.globalAlpha = 1;
		}

		if (s.band)
			dir *= -1;
	}

	function buildClip(is, gaps) {
		let s = series[is];
		let toSpan = new Set(s.spanGaps(self, gaps, is));
		gaps = gaps.filter(g => !toSpan.has(g));

		let clip = null;

		// create clip path (invert gaps and non-gaps)
		if (gaps.length > 0) {
			clip = new Path2D();

			let prevGapEnd = plotLft;

			for (let i = 0; i < gaps.length; i++) {
				let g = gaps[i];

				clip.rect(prevGapEnd, plotTop, g[0] - prevGapEnd, plotTop + plotHgt);

				prevGapEnd = g[1];
			}

			clip.rect(prevGapEnd, plotTop, plotLft + plotWid - prevGapEnd, plotTop + plotHgt);
		}

		return clip;
	}

	function buildPaths(self, is, _i0, _i1) {
		const s = series[is];

		const xdata  = data[0];
		const ydata  = data[is];
		const scaleX = scales[xScaleKey];
		const scaleY = scales[s.scale];

		const _paths = dir == 1 ? {stroke: new Path2D(), fill: null, clip: null} : series[is-1]._paths;
		const stroke = _paths.stroke;
		const width = round3(s[WIDTH] * pxRatio);

		let minY = inf,
			maxY = -inf,
			outY, outX;

		// todo: don't build gaps on dir = -1 pass
		let gaps = [];

		let accX = round(getXPos(xdata[dir == 1 ? _i0 : _i1], scaleX, plotWid, plotLft));

		// the moves the shape edge outside the canvas so stroke doesnt bleed in
		if (s.band && dir == 1 && _i0 == i0) {
			if (width)
				stroke.lineTo(-width, round(getYPos(ydata[_i0], scaleY, plotHgt, plotTop)));

			if (scaleX.min < xdata[0])
				gaps.push([plotLft, accX - 1]);
		}

		for (let i = dir == 1 ? _i0 : _i1; i >= _i0 && i <= _i1; i += dir) {
			let x = round(getXPos(xdata[i], scaleX, plotWid, plotLft));

			if (x == accX) {
				if (ydata[i] != null) {
					outY = round(getYPos(ydata[i], scaleY, plotHgt, plotTop));
					minY = min(outY, minY);
					maxY = max(outY, maxY);
				}
			}
			else {
				let addGap = false;

				if (minY != inf) {
					stroke.lineTo(accX, minY);
					stroke.lineTo(accX, maxY);
					stroke.lineTo(accX, outY);
					outX = accX;
				}
				else
					addGap = true;

				if (ydata[i] != null) {
					outY = round(getYPos(ydata[i], scaleY, plotHgt, plotTop));
					stroke.lineTo(x, outY);
					minY = maxY = outY;

					// prior pixel can have data but still start a gap if ends with null
					if (x - accX > 1 && ydata[i-1] == null)
						addGap = true;
				}
				else {
					minY = inf;
					maxY = -inf;
				}

				if (addGap) {
					let prevGap = gaps[gaps.length - 1];

					if (prevGap && prevGap[0] == outX)			// TODO: gaps must be encoded at stroke widths?
						prevGap[1] = x;
					else
						gaps.push([outX, x]);
				}

				accX = x;
			}
		}

		if (s.band) {
			let overShoot = width * 100, _iy, _x;

			// the moves the shape edge outside the canvas so stroke doesnt bleed in
			if (dir == -1 && _i0 == i0) {
				_x = plotLft - overShoot;
				_iy = _i0;
			}

			if (dir == 1 && _i1 == i1) {
				_x = plotLft + plotWid + overShoot;
				_iy = _i1;

				if (scaleX.max > xdata[dataLen - 1])
					gaps.push([accX, plotLft + plotWid]);
			}

			stroke.lineTo(_x, round(getYPos(ydata[_iy], scaleY, plotHgt, plotTop)));
		}

		if (dir == 1) {
			_paths.clip = buildClip(is, gaps);

			if (s.fill != null) {
				let fill = _paths.fill = new Path2D(stroke);

				let zeroY = round(getYPos(0, scaleY, plotHgt, plotTop));
				fill.lineTo(plotLft + plotWid, zeroY);
				fill.lineTo(plotLft, zeroY);
			}
		}

		if (s.band)
			dir *= -1;

		return _paths;
	}

	function getIncrSpace(axis, min, max, fullDim) {
		let incrSpace;

		if (fullDim <= 0)
			incrSpace = [0, 0];
		else {
			let minSpace = axis.space(self, min, max, fullDim);
			let incrs = axis.incrs(self, min, max, fullDim, minSpace);
			incrSpace = findIncr(max - min, incrs, fullDim, minSpace);
			incrSpace.push(incrSpace[1]/minSpace);
		}

		return incrSpace;
	}

	function drawOrthoLines(offs, ori, side, pos0, len, width, stroke, dash) {
		let offset = (width % 2) / 2;

		ctx.translate(offset, offset);

		setCtxStyle(stroke, width, dash);

		ctx.beginPath();

		let x0, y0, x1, y1, pos1 = pos0 + (side == 0 || side == 3 ? -len : len);

		if (ori == 0) {
			y0 = pos0;
			y1 = pos1;
		}
		else {
			x0 = pos0;
			x1 = pos1;
		}

		offs.forEach((off, i) => {
			if (ori == 0)
				x0 = x1 = off;
			else
				y0 = y1 = off;

			ctx.moveTo(x0, y0);
			ctx.lineTo(x1, y1);
		});

		ctx.stroke();

		ctx.translate(-offset, -offset);
	}

	function drawAxesGrid() {
		axes.forEach((axis, i) => {
			if (!axis.show)
				return;

			let scale = scales[axis.scale];

			// this will happen if all series using a specific scale are toggled off
			if (scale.min == inf)
				return;

			let side = axis.side;
			let ori = side % 2;

			let {min, max} = scale;

			let [incr, space, pctSpace] = getIncrSpace(axis, min, max, ori == 0 ? plotWidCss : plotHgtCss);

			// if we're using index positions, force first tick to match passed index
			let forceMin = scale.distr == 2;

			let splits = axis.split(self, min, max, incr, pctSpace, forceMin);

			let getPos  = ori == 0 ? getXPos : getYPos;
			let plotDim = ori == 0 ? plotWid : plotHgt;
			let plotOff = ori == 0 ? plotLft : plotTop;

			let canOffs = splits.map(val => round(getPos(val, scale, plotDim, plotOff)));

			let axisGap  = round(axis.gap * pxRatio);

			let ticks = axis.ticks;
			let tickSize = ticks.show ? round(ticks.size * pxRatio) : 0;

			// tick labels
			// BOO this assumes a specific data/series
			let values = axis.values(
				self,
				scale.distr == 2 ? splits.map(i => data0[i]) : splits,
				space,
				scale.distr == 2 ? data0[splits[1]] -  data0[splits[0]] : incr,
			);

			// rotating of labels only supported on bottom x axis
			let angle = side == 2 ? axis.rotate(self, values, space) * -PI/180 : 0;

			let basePos  = round(axis._pos * pxRatio);
			let shiftAmt = tickSize + axisGap;
			let shiftDir = ori == 0 && side == 0 || ori == 1 && side == 3 ? -1 : 1;
			let finalPos = basePos + shiftAmt * shiftDir;
			let y        = ori == 0 ? finalPos : 0;
			let x        = ori == 1 ? finalPos : 0;

			ctx.font         = axis.font[0];
			ctx.fillStyle    = axis.stroke || hexBlack;									// rgba?
			ctx.textAlign    = angle > 0 ? LEFT :
			                   angle < 0 ? RIGHT :
			                   ori == 0 ? "center" : side == 3 ? RIGHT : LEFT;
			ctx.textBaseline = angle ||
			                   ori == 1 ? "middle" : side == 2 ? TOP   : BOTTOM;

			let lineHeight   = axis.font[1] * lineMult;

			values.forEach((val, i) => {
				if (ori == 0)
					x = canOffs[i];
				else
					y = canOffs[i];

				(""+val).split(/\n/gm).forEach((text, j) => {
					if (angle) {
						ctx.save();
						ctx.translate(x, y + j * lineHeight);
						ctx.rotate(angle);
						ctx.fillText(text, 0, 0);
						ctx.restore();
					}
					else
						ctx.fillText(text, x, y + j * lineHeight);
				});
			});

			// axis label
			if (axis.label) {
				ctx.save();

				let baseLpos = round(axis._lpos * pxRatio);

				if (ori == 1) {
					x = y = 0;

					ctx.translate(
						baseLpos,
						round(plotTop + plotHgt / 2),
					);
					ctx.rotate((side == 3 ? -PI : PI) / 2);

				}
				else {
					x = round(plotLft + plotWid / 2);
					y = baseLpos;
				}

				ctx.font         = axis.labelFont[0];
			//	ctx.fillStyle    = axis.labelStroke || hexBlack;						// rgba?
				ctx.textAlign    = "center";
				ctx.textBaseline = side == 2 ? TOP : BOTTOM;

				ctx.fillText(axis.label, x, y);

				ctx.restore();
			}

			// ticks
			if (ticks.show) {
				drawOrthoLines(
					canOffs,
					ori,
					side,
					basePos,
					tickSize,
					round3(ticks[WIDTH] * pxRatio),
					ticks.stroke,
				);
			}

			// grid
			let grid = axis.grid;

			if (grid.show) {
				drawOrthoLines(
					canOffs,
					ori,
					ori == 0 ? 2 : 1,
					ori == 0 ? plotTop : plotLft,
					ori == 0 ? plotHgt : plotWid,
					round3(grid[WIDTH] * pxRatio),
					grid.stroke,
					grid.dash,
				);
			}
		});

		fire("drawAxes");
	}

	function resetYSeries() {
	//	log("resetYSeries()", arguments);

		series.forEach((s, i) => {
			if (i > 0) {
				s.min = inf;
				s.max = -inf;
				s._paths = null;
			}
		});
	}

	let didPaint;

	function paint() {
		if (inBatch) {
			shouldPaint = true;
			return;
		}

	//	log("paint()", arguments);

		ctx.clearRect(0, 0, can[WIDTH], can[HEIGHT]);
		fire("drawClear");
		drawAxesGrid();
		drawSeries();
		didPaint = true;
		fire("draw");
	}

	self.redraw = rebuildPaths => {
		if (rebuildPaths !== false)
			_setScale(xScaleKey, scales[xScaleKey].min, scales[xScaleKey].max);
		else
			paint();
	};

	// redraw() => setScale('x', scales.x.min, scales.x.max);

	// explicit, never re-ranged (is this actually true? for x and y)
	function setScale(key, opts) {
		let sc = scales[key];

		if (sc.from == null) {
			if (key == xScaleKey) {
				if (sc.distr == 2) {
					opts.min = closestIdx(opts.min, data[0]);
					opts.max = closestIdx(opts.max, data[0]);
				}

				// prevent setting a temporal x scale too small since Date objects cannot advance ticks smaller than 1ms
				if ( sc.time && axes[0].show && opts.max > opts.min) {
					// since scales and axes are loosly coupled, we have to make some assumptions here :(
					let incr = getIncrSpace(axes[0], opts.min, opts.max, plotWidCss)[0];

					if (incr < 1e-3)
						return;
				}
			}

		//	log("setScale()", arguments);

			pendScales[key] = opts;

			didPaint = false;
			setScales();
			!didPaint && paint();
			didPaint = false;
		}
	}

	self.setScale = setScale;

//	INTERACTION

	let vt;
	let hz;

	// starting position
	let mouseLeft0;
	let mouseTop0;

	// current position
	let mouseLeft1;
	let mouseTop1;

	let dragging = false;

	const drag =  cursor.drag;

	if ( cursor.show) {
		let c = "cursor-";

		if (cursor.x) {
			mouseLeft1 = cursor.left;
			vt = placeDiv(c + "x", over);
		}

		if (cursor.y) {
			mouseTop1 = cursor.top;
			hz = placeDiv(c + "y", over);
		}
	}

	const select = self.select = assign({
		show:   true,
		left:	0,
		width:	0,
		top:	0,
		height:	0,
	}, opts.select);

	const selectDiv = select.show ? placeDiv("select", over) : null;

	function setSelect(opts, _fire) {
		if (select.show) {
			for (let prop in opts)
				setStylePx(selectDiv, prop, select[prop] = opts[prop]);

			_fire !== false && fire("setSelect");
		}
	}

	self.setSelect = setSelect;

	function toggleDOM(i, onOff) {
		let s = series[i];
		let label = showLegend ? legendRows[i][0].parentNode : null;

		if (s.show)
			label && remClass(label, "off");
		else {
			label && addClass(label, "off");
			 cursorPts.length > 1 && trans(cursorPts[i], 0, -10);
		}
	}

	function _setScale(key, min, max) {
		setScale(key, {min, max});
	}

	function setSeries(i, opts, pub) {
	//	log("setSeries()", arguments);

		let s = series[i];

	//	batch(() => {
			// will this cause redundant paint() if both show and focus are set?
			if (opts.focus != null)
				setFocus(i);

			if (opts.show != null) {
				s.show = opts.show;
				 toggleDOM(i, opts.show);

				if (s.band) {
					// not super robust, will break if two bands are adjacent
					let ip = series[i+1] && series[i+1].band ? i+1 : i-1;
					series[ip].show = s.show;
					 toggleDOM(ip, opts.show);
				}

				_setScale(xScaleKey, scales[xScaleKey].min, scales[xScaleKey].max);		// redraw
			}
	//	});

		// firing setSeries after setScale seems out of order, but provides access to the updated props
		// could improve by predefining firing order and building a queue
		fire("setSeries", i, opts);

		 pub && sync.pub("setSeries", self, i, opts);
	}

	self.setSeries = setSeries;

	function _alpha(i, value) {
		series[i].alpha = value;

		if ( legendRows)
			legendRows[i][0].parentNode.style.opacity = value;
	}

	function _setAlpha(i, value) {
		let s = series[i];

		_alpha(i, value);

		if (s.band) {
			// not super robust, will break if two bands are adjacent
			let ip = series[i+1].band ? i+1 : i-1;
			_alpha(ip, value);
		}
	}

	// y-distance
	const distsToCursor =  Array(series.length);

	let focused = null;

	function setFocus(i) {
		if (i != focused) {
		//	log("setFocus()", arguments);

			series.forEach((s, i2) => {
				_setAlpha(i2, i == null || i2 == 0 || i2 == i ? 1 : focus.alpha);
			});

			focused = i;
			paint();
		}
	}

	if (showLegend && cursorFocus) {
		on(mouseleave, legendEl, e => {
			if (cursor.locked)
				return;
			setSeries(null, {focus: false}, syncOpts.setSeries);
			updateCursor();
		});
	}

	function scaleValueAtPos(pos, scale) {
		let dim = scale == xScaleKey ? plotWidCss : plotHgtCss;
		let pct = clamp(pos / dim, 0, 1);

		let sc = scales[scale];
		let d = sc.max - sc.min;
		return sc.min + pct * d;
	}

	function closestIdxFromXpos(pos) {
		let v = scaleValueAtPos(pos, xScaleKey);
		return closestIdx(v, data[0], i0, i1);
	}

	self.valToIdx = val => closestIdx(val, data[0]);
	self.posToIdx = closestIdxFromXpos;
	self.posToVal = (pos, scale) => scaleValueAtPos(scale == xScaleKey ? pos : plotHgtCss - pos, scale);
	self.valToPos = (val, scale, can) => (
		scale == xScaleKey ?
		getXPos(val, scales[scale],
			can ? plotWid : plotWidCss,
			can ? plotLft : 0,
		) :
		getYPos(val, scales[scale],
			can ? plotHgt : plotHgtCss,
			can ? plotTop : 0,
		)
	);

	let inBatch = false;
	let shouldPaint = false;
	let shouldSetScales = false;
	let shouldUpdateCursor = false;

	// defers calling expensive functions
	function batch(fn) {
		inBatch = true;
		fn(self);
		inBatch = false;
		shouldSetScales && setScales();
		 shouldUpdateCursor && updateCursor();
		shouldPaint && !didPaint && paint();
		shouldSetScales = shouldUpdateCursor = shouldPaint = didPaint = inBatch;
	}

	self.batch = batch;

	 (self.setCursor = opts => {
		mouseLeft1 = opts.left;
		mouseTop1 = opts.top;
	//	assign(cursor, opts);
		updateCursor();
	});

	let cursorRaf = 0;

	function updateCursor(ts) {
		if (inBatch) {
			shouldUpdateCursor = true;
			return;
		}

	//	ts == null && log("updateCursor()", arguments);

		cursorRaf = 0;

		if (cursor.show) {
			cursor.x && trans(vt,round(mouseLeft1),0);
			cursor.y && trans(hz,0,round(mouseTop1));
		}

		let idx;

		// if cursor hidden, hide points & clear legend vals
		if (mouseLeft1 < 0 || dataLen == 0) {
			idx = null;

			for (let i = 0; i < series.length; i++) {
				if (i > 0) {
					distsToCursor[i] = inf;
					 cursorPts.length > 1 && trans(cursorPts[i], -10, -10);
				}

				if (showLegend) {
					if (i == 0 && multiValLegend)
						continue;

					for (let j = 0; j < legendRows[i].length; j++)
						legendRows[i][j][firstChild].nodeValue = '--';
				}
			}

			if (cursorFocus)
				setSeries(null, {focus: true}, syncOpts.setSeries);
		}
		else {
		//	let pctY = 1 - (y / rect[HEIGHT]);

			idx = closestIdxFromXpos(mouseLeft1);

			let scX = scales[xScaleKey];

			let xPos = round3(getXPos(data[0][idx], scX, plotWidCss, 0));

			for (let i = 0; i < series.length; i++) {
				let s = series[i];

				if (i > 0 && s.show) {
					let valAtIdx = data[i][idx];

					let yPos = valAtIdx == null ? -10 : round3(getYPos(valAtIdx, scales[s.scale], plotHgtCss, 0));

					distsToCursor[i] = yPos > 0 ? abs(yPos - mouseTop1) : inf;

					 cursorPts.length > 1 && trans(cursorPts[i], xPos, yPos);
				}
				else
					distsToCursor[i] = inf;

				if (showLegend) {
					if (i == 0 && multiValLegend)
						continue;

					let src = i == 0 && xScaleDistr == 2 ? data0 : data[i];

					let vals = multiValLegend ? s.values(self, i, idx) : {_: s.value(self, src[idx], i, idx)};

					let j = 0;

					for (let k in vals)
						legendRows[i][j++][firstChild].nodeValue = vals[k];
				}
			}
		}

		// nit: cursor.drag.setSelect is assumed always true
		if (mouseLeft1 >= 0 && select.show && dragging) {
			// setSelect should not be triggered on move events
			if (drag.x) {
				let minX = min(mouseLeft0, mouseLeft1);
				let maxX = max(mouseLeft0, mouseLeft1);
				setStylePx(selectDiv, LEFT,  select[LEFT] = minX);
				setStylePx(selectDiv, WIDTH, select[WIDTH] = maxX - minX);
			}

			if (drag.y) {
				let minY = min(mouseTop0, mouseTop1);
				let maxY = max(mouseTop0, mouseTop1);
				setStylePx(selectDiv, TOP,    select[TOP] = minY);
				setStylePx(selectDiv, HEIGHT, select[HEIGHT] = maxY - minY);
			}
		}

		// if ts is present, means we're implicitly syncing own cursor as a result of debounced rAF
		if (ts != null) {
			// this is not technically a "mousemove" event, since it's debounced, rename to setCursor?
			// since this is internal, we can tweak it later
			sync.pub(mousemove, self, mouseLeft1, mouseTop1, plotWidCss, plotHgtCss, idx);

			if (cursorFocus) {
				let minDist = min.apply(null, distsToCursor);

				let fi = null;

				if (minDist <= focus.prox) {
					distsToCursor.some((dist, i) => {
						if (dist == minDist)
							return fi = i;
					});
				}

				setSeries(fi, {focus: true}, syncOpts.setSeries);
			}
		}

		cursor.idx = idx;
		cursor.left = mouseLeft1;
		cursor.top = mouseTop1;

		ready && fire("setCursor");
	}

	let rect = null;

	function syncRect() {
		rect = over.getBoundingClientRect();
	}

	function mouseMove(e, src, _x, _y, _w, _h, _i) {
		if (cursor.locked)
			return;

		cacheMouse(e, src, _x, _y, _w, _h, _i, false, e != null);

		if (e != null) {
			if (cursorRaf == 0)
				cursorRaf = rAF(updateCursor);
		}
		else
			updateCursor();
	}

	function cacheMouse(e, src, _x, _y, _w, _h, _i, initial, snap) {
		if (e != null) {
			_x = e.clientX - rect.left;
			_y = e.clientY - rect.top;
		}
		else {
			_x = plotWidCss * (_x/_w);
			_y = plotHgtCss * (_y/_h);
		}

		if (snap) {
			if (_x <= 1 || _x >= plotWidCss - 1)
				_x = incrRound(_x, plotWidCss);

			if (_y <= 1 || _y >= plotHgtCss - 1)
				_y = incrRound(_y, plotHgtCss);
		}

		if (initial) {
			mouseLeft0 = _x;
			mouseTop0 = _y;
		}
		else {
			mouseLeft1 = _x;
			mouseTop1 = _y;
		}
	}

	function hideSelect() {
		setSelect({
			width:	!drag.x ? plotWidCss : 0,
			height:	!drag.y ? plotHgtCss : 0,
		}, false);
	}

	function mouseDown(e, src, _x, _y, _w, _h, _i) {
		if (e == null || filtMouse(e)) {
			dragging = true;

			cacheMouse(e, src, _x, _y, _w, _h, _i, true, true);

			if (select.show && (drag.x || drag.y))
				hideSelect();

			if (e != null) {
				on(mouseup, doc, mouseUp);
				sync.pub(mousedown, self, mouseLeft0, mouseTop0, plotWidCss, plotHgtCss, null);
			}
		}
	}

	function mouseUp(e, src, _x, _y, _w, _h, _i) {
		if ((e == null || filtMouse(e))) {
			dragging = false;

			cacheMouse(e, src, _x, _y, _w, _h, _i, false, true);

			if (mouseLeft1 != mouseLeft0 || mouseTop1 != mouseTop0) {
				setSelect(select);

				if (drag.setScale) {
					batch(() => {
						if (drag.x) {
							_setScale(xScaleKey,
								scaleValueAtPos(select[LEFT], xScaleKey),
								scaleValueAtPos(select[LEFT] + select[WIDTH], xScaleKey),
							);
						}

						if (drag.y) {
							for (let k in scales) {
								let sc = scales[k];

								if (k != xScaleKey && sc.from == null) {
									_setScale(k,
										scaleValueAtPos(plotHgtCss - select[TOP] - select[HEIGHT], k),
										scaleValueAtPos(plotHgtCss - select[TOP], k),
									);
								}
							}
						}
					});

					hideSelect();
				}
			}
			else if (cursor.lock) {
				cursor.locked = !cursor.locked;

				if (!cursor.locked)
					updateCursor();
			}

			if (e != null) {
				off(mouseup, doc, mouseUp);
				sync.pub(mouseup, self, mouseLeft1, mouseTop1, plotWidCss, plotHgtCss, null);
			}
		}
	}

	function mouseLeave(e, src, _x, _y, _w, _h, _i) {
		if (!cursor.locked && !dragging) {
			mouseLeft1 = -10;
			mouseTop1 = -10;
			// passing a non-null timestamp to force sync/mousemove event
			updateCursor(1);
		}
	}

	function dblClick(e, src, _x, _y, _w, _h, _i) {
		autoScaleX();

		if (e != null)
			sync.pub(dblclick, self, mouseLeft1, mouseTop1, plotWidCss, plotHgtCss, null);
	}

	// internal pub/sub
	const events = {};

	events[mousedown] = mouseDown;
	events[mousemove] = mouseMove;
	events[mouseup] = mouseUp;
	events[dblclick] = dblClick;
	events["setSeries"] = (e, src, idx, opts) => {
		setSeries(idx, opts);
	};

	let deb;

	if ( cursor.show) {
		on(mousedown, over, mouseDown);
		on(mousemove, over, mouseMove);
		on(mouseenter, over, syncRect);
		on(mouseleave, over, mouseLeave);
		drag.setScale && on(dblclick, over, dblClick);

		deb = debounce(syncRect, 100);

		on(resize, win, deb);
		on(scroll, win, deb);

		self.syncRect = syncRect;
	}

	// external on/off
	const hooks = self.hooks = opts.hooks || {};

	function fire(evName, a1, a2) {
		if (evName in hooks) {
			hooks[evName].forEach(fn => {
				fn.call(null, self, a1, a2);
			});
		}
	}

	(opts.plugins || []).forEach(p => {
		for (let evName in p.hooks)
			hooks[evName] = (hooks[evName] || []).concat(p.hooks[evName]);
	});

	const syncOpts =  assign({
		key: null,
		setSeries: false,
	}, cursor.sync);

	const syncKey =  syncOpts.key;

	const sync =  (syncKey != null ? (syncs[syncKey] = syncs[syncKey] || _sync()) : _sync());

	 sync.sub(self);

	function pub(type, src, x, y, w, h, i) {
		events[type](null, src, x, y, w, h, i);
	}

	 (self.pub = pub);

	function destroy() {
		 sync.unsub(self);
		 off(resize, win, deb);
		 off(scroll, win, deb);
		root.remove();
		fire("destroy");
	}

	self.destroy = destroy;

	function _init() {
		_setSize(opts[WIDTH], opts[HEIGHT]);

		fire("init", opts, data);

		setData(data || opts.data, false);

		if (pendScales[xScaleKey])
			setScale(xScaleKey, pendScales[xScaleKey]);
		else
			autoScaleX();

		setSelect(select, false);

		ready = true;

		fire("ready");
	}

	if (then) {
		if (then instanceof HTMLElement) {
			then.appendChild(root);
			_init();
		}
		else
			then(self, _init);
	}
	else
		_init();

	return self;
}

uPlot.assign = assign;
uPlot.rangeNum = rangeNum;

{
	uPlot.fmtDate = fmtDate;
	uPlot.tzDate  = tzDate;
}

export default uPlot;