'use strict';

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

var calcColorscale = require('../scatter/colorscale_calc');
var arraysToCalcdata = require('../scatter/arrays_to_calcdata');
var calcSelection = require('../scatter/calc_selection');
var calcMarkerSize = require('../scatter/calc').calcMarkerSize;
var lookupCarpet = require('../carpet/lookup_carpetid');

module.exports = function calc(gd, trace) {
    var carpet = trace._carpetTrace = lookupCarpet(gd, trace);
    if(!carpet || !carpet.visible || carpet.visible === 'legendonly') return;
    var i;

    // Transfer this over from carpet before plotting since this is a necessary
    // condition in order for cartesian to actually plot this trace:
    trace.xaxis = carpet.xaxis;
    trace.yaxis = carpet.yaxis;

    // make the calcdata array
    var serieslen = trace._length;
    var cd = new Array(serieslen);
    var a, b;
    var needsCull = false;
    for(i = 0; i < serieslen; i++) {
        a = trace.a[i];
        b = trace.b[i];
        if(isNumeric(a) && isNumeric(b)) {
            var xy = carpet.ab2xy(+a, +b, true);
            var visible = carpet.isVisible(+a, +b);
            if(!visible) needsCull = true;
            cd[i] = {x: xy[0], y: xy[1], a: a, b: b, vis: visible};
        } else cd[i] = {x: false, y: false};
    }

    trace._needsCull = needsCull;

    cd[0].carpet = carpet;
    cd[0].trace = trace;

    calcMarkerSize(trace, serieslen);
    calcColorscale(gd, trace);
    arraysToCalcdata(cd, trace);
    calcSelection(cd, trace);

    return cd;
};