import {distance} from "./util";

export function getChartMouseLocation(chartSelector, event){

    let chartVizSelector = chartSelector + " .chart-viz",
        chartVizNode = document.querySelector(chartVizSelector),
        chartVizGroupNode = document.querySelector(chartVizSelector + " .chart-viz-group"),
        boundingRect = chartVizGroupNode.getBoundingClientRect(),
        x = event.clientX - boundingRect.left,
        y = event.clientY - boundingRect.top;

    x = x - chartVizNode.scrollLeft;
    y = y - chartVizNode.scrollTop;

    return {x: x, y: y};
}

export function xClosestDataPoint(p1, data){

    let i, d, d1, dist,
        y, yDist, yDist1, iClose,
        minDistance;

    for(i = 0; i < data.dataArray.length; i++){

        d = data.dataArray[i];
        dist = Math.abs(p1.x - d.x);

        if(minDistance === undefined){
            iClose = i;
            minDistance = dist;
        }
        else if(dist < minDistance){
            iClose = i;
            minDistance = dist;
        }
        else if(dist === minDistance){

            yDist = Math.abs(p1.y - d.y);

            d1 = data.dataArray[iClose];
            yDist1 = Math.abs(p1.y - d1.y);

            if(yDist < yDist1) {
                iClose = i;
            }
        }
    }

    return {
        i: iClose,
        d: data.dataArray[iClose]
    };
}

export function closestDataPoint(p1, data, isStack = false){

    let i, d, dist,
        p2 = {x: 0, y: 0},
        iClose, y,
        minDistance;

    for(i = 0; i < data.dataArray.length; i++){

        d = data.dataArray[i];

        p2.x = d.x;

        y = (!isStack) ? d.y : d.y0;
        p2.y = y;

        dist = distance(p1, p2);
        if(minDistance === undefined){
            iClose = i;
            minDistance = dist;
        }
        else if(dist < minDistance){
            iClose = i;
            minDistance = dist;
        }
    }

    return {
        i: iClose,
        d: data.dataArray[iClose]
    };
}