app.factory("kpiFac", function($rootScope, $http) {
    const getMaxObj = function(arr, val) {
            //since math.max doesn't REALLY work on objects, and either way, it returns ONLY the max val (not all associated data);
            var currMax = null;
            console.log('max of', arr, 'at', val)
            for (var i = 0; i < arr.length; i++) {
                if (!currMax || currMax[val] < arr[i][val]) {
                    currMax = arr[i];
                }
            }
            return currMax;
        },
        dayDur = 1000 * 3600 * 24,
        getMinObj = function(arr, val) {
            //since math.min doesn't REALLY work on objects, and either way, it returns ONLY the min val (not all associated data);
            var currMin = null;
            for (var i = 0; i < arr.length; i++) {
                if (!currMin || currMin[val] > arr[i][val]) {
                    currMin = arr[i];
                }
            }
            return currMin;
        };
    return {
        getKPI: function(dev) {
            let lastTime = devs[0].record_date
            if (testMode) {
                now = new Date(lastTime)
            }
            if (req.params.pol && req.params.pol.length > 0) {
                devs = devs.filter(x => { return x.sensor_type.toLowerCase() == req.params.pol.toLowerCase() })
            }
            let kpiRez = {
                    highWeek: null,
                    lowWeek: null,
                    highDay: null,
                    lowDay: null,
                    highVarDay: { score: 0, time: null },
                    highVarWk: { score: 0, time: null },
                    maxDevsDay: 1
                },
                day = devs.filter(x => {
                    // console.log('DATE', x.record_date, new Date(x.record_date).getTime())
                    return now - new Date(x.record_date).getTime() < 86400000;
                }),
                wk = devs.filter(y => {
                    return now - new Date(y.record_date).getTime() < 604800000;
                });
            kpiRez.highWeek = getMaxObj(wk, 'score');
            kpiRez.lowWeek = getMinObj(wk, 'score');
            kpiRez.highDay = getMaxObj(day, 'score');
            kpiRez.lowDay = getMinObj(day, 'score');
            kpiRez.highVarDay.score = -99999;
            kpiRez.highVarWk.score = -99999;
            for (var i = 0; i < wk.length - 1; i++) {
                if (Math.abs(wk[i + 1].score - wk[i].score) > kpiRez.highVarWk.score) {
                    kpiRez.highVarWk.score = Math.abs(wk[i + 1].score - wk[i].score);
                    kpiRez.highVarWk.time = wk[i].record_date;
                }
            }
            for (var i = 0; i < day.length - 1; i++) {
                if (Math.abs(day[i + 1].score - day[i].score) > kpiRez.highVarDay.score) {
                    kpiRez.highVarDay.score = Math.abs(day[i + 1].score - day[i].score);
                    kpiRez.highVarDay.time = day[i].record_date;
                }
            }
            return kpiRez;
        }
    };
});