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'use strict';

var d3 = require('@plotly/d3');

var isNumeric = require('fast-isnumeric');

var Drawing = require('../drawing');

var subTypes = require('../../traces/scatter/subtypes');

module.exports = function plot(gd, traces, plotinfo, transitionOpts) {

var isNew;

var xa = plotinfo.xaxis;

var ya = plotinfo.yaxis;

var hasAnimation = transitionOpts && transitionOpts.duration > 0;

var isStatic = gd._context.staticPlot;

traces.each(function(d) {

var trace = d[0].trace;

// || {} is in case the trace (specifically scatterternary)

// doesn't support error bars at all, but does go through

// the scatter.plot mechanics, which calls ErrorBars.plot

// internally

var xObj = trace.error_x || {};

var yObj = trace.error_y || {};

var keyFunc;

if(trace.ids) {

keyFunc = function(d) {return d.id;};

}

var sparse = (

subTypes.hasMarkers(trace) &&

trace.marker.maxdisplayed > 0

);

if(!yObj.visible && !xObj.visible) d = [];

var errorbars = d3.select(this).selectAll('g.errorbar')

.data(d, keyFunc);

errorbars.exit().remove();

if(!d.length) return;

if(!xObj.visible) errorbars.selectAll('path.xerror').remove();

if(!yObj.visible) errorbars.selectAll('path.yerror').remove();

errorbars.style('opacity', 1);

var enter = errorbars.enter().append('g')

.classed('errorbar', true);

if(hasAnimation) {

enter.style('opacity', 0).transition()

.duration(transitionOpts.duration)

.style('opacity', 1);

}

Drawing.setClipUrl(errorbars, plotinfo.layerClipId, gd);

errorbars.each(function(d) {

var errorbar = d3.select(this);

var coords = errorCoords(d, xa, ya);

if(sparse && !d.vis) return;

var path;

var yerror = errorbar.select('path.yerror');

if(yObj.visible && isNumeric(coords.x) &&

isNumeric(coords.yh) &&

isNumeric(coords.ys)) {

var yw = yObj.width;

path = 'M' + (coords.x - yw) + ',' +

coords.yh + 'h' + (2 * yw) + // hat

'm-' + yw + ',0V' + coords.ys; // bar

if(!coords.noYS) path += 'm-' + yw + ',0h' + (2 * yw); // shoe

isNew = !yerror.size();

if(isNew) {

yerror = errorbar.append('path')

.style('vector-effect', isStatic ? 'none' : 'non-scaling-stroke')

.classed('yerror', true);

} else if(hasAnimation) {

yerror = yerror

.transition()

.duration(transitionOpts.duration)

.ease(transitionOpts.easing);

}

yerror.attr('d', path);

} else yerror.remove();

var xerror = errorbar.select('path.xerror');

if(xObj.visible && isNumeric(coords.y) &&

isNumeric(coords.xh) &&

isNumeric(coords.xs)) {

var xw = (xObj.copy_ystyle ? yObj : xObj).width;

path = 'M' + coords.xh + ',' +

(coords.y - xw) + 'v' + (2 * xw) + // hat

'm0,-' + xw + 'H' + coords.xs; // bar

if(!coords.noXS) path += 'm0,-' + xw + 'v' + (2 * xw); // shoe

isNew = !xerror.size();

if(isNew) {

xerror = errorbar.append('path')

.style('vector-effect', isStatic ? 'none' : 'non-scaling-stroke')

.classed('xerror', true);

} else if(hasAnimation) {

xerror = xerror

.transition()

.duration(transitionOpts.duration)

.ease(transitionOpts.easing);

}

xerror.attr('d', path);

} else xerror.remove();

});

});

};

// compute the coordinates of the error-bar objects

function errorCoords(d, xa, ya) {

var out = {

x: xa.c2p(d.x),

y: ya.c2p(d.y)

};

// calculate the error bar size and hat and shoe locations

if(d.yh !== undefined) {

out.yh = ya.c2p(d.yh);

out.ys = ya.c2p(d.ys);

// if the shoes go off-scale (ie log scale, error bars past zero)

// clip the bar and hide the shoes

if(!isNumeric(out.ys)) {

out.noYS = true;

out.ys = ya.c2p(d.ys, true);

}

}

if(d.xh !== undefined) {

out.xh = xa.c2p(d.xh);

out.xs = xa.c2p(d.xs);

if(!isNumeric(out.xs)) {

out.noXS = true;

out.xs = xa.c2p(d.xs, true);

}

}

return out;

}