var fs = require('fs');

module.exports = {

    /**
     * Returns the available dates we have data.
     * @param  {[type]}   req  [description]
     * @param  {[type]}   res  [description]
     * @param  {Function} next [description]
     * @return {Array}        [description]
     */
	getDates: function (req, res, next) {

		var dates = [];
		fs.readdir('data', function (err, files) {

			if (err) {
				console.warn(err);
				return res.negotiate(err);
			}

			files.forEach(function (file) {
				if(~file.indexOf('.json')) {
					dates.push(file.replace('.json', ''));
				}
			});

			res.json(dates);
		});

	},

    /**
     * Calculate the "periods"
     * @param  {[type]} req [description]
     * @param  {[type]} res [description]
     * @return {[type]}     [description]
     */
	calculated: function (req, res) {
        /* jshint maxstatements: 60*/

        var rotationId = req.params.id || 120;
        var startDate = req.params.start || '2015-03-01';
        var endDate = req.params.end || '2015-03-13';
        var allDates = getDatesBetween(new Date(startDate), (new Date(endDate)));
        var allRotations = [];
        var delay = 0;
        var Y = 0;

        // Push all dates to array
        for(var h = 0; h < allDates.length; h++){
            allRotations.push({
               date: allDates[h],
               rotations: require('../../data/' + allDates[h] + '.json')
            });
        }

    	// Get the position from ID.
    	var pos = allRotations[0].rotations.map(function(e) {
    		return e.id;
    	}).indexOf(parseInt(rotationId));


        // Removes days that the bus didn't go on that rotation
        for(var g = 0; g < allRotations.length; g++) {
            if(allRotations[g].rotations[pos].trips.length <= 0){

                allRotations.splice(g, 1);
            }
        }

        // Quick and dirty clone
        var calculatedRotation = _.cloneDeep(allRotations[0].rotations[pos]);

        /* jshint maxdepth: 5*/
    	// looping trips

    	for (var i = 0, tripLen = allRotations[0].rotations[pos].trips.length; i < tripLen; i++) {

			// looping stops
    		for (var j = 0, stopLen = allRotations[0].rotations[pos].trips[i].stops.length; j < stopLen; j++) {

                calculatedRotation.trips[i].stops[j].y = Y;

                arrStop = 0;
                delay = 0;
                stopDelayAvg = 0;

                // looping dates
    			for (var k = 0, rotLen = allRotations.length; k < rotLen; k++) {

    				if (j < allRotations[k].rotations[pos].trips[i].stops.length-1) {
    					var arrToNextStop = allRotations[k].rotations[pos].trips[i].stops[j].arrivalToNextStop;
    					var schToNextStop = allRotations[k].rotations[pos].trips[i].stops[j].schedualedTimeToNextStop;
    					var delayNextStop = allRotations[k].rotations[pos].trips[i].stops[j].delayNextStop;
                        var stopDelay = allRotations[k].rotations[pos].trips[i].stops[j].stopDelay;
                        //var Y = allRotations[k].rotations[pos].trips[i].stops[j].y;


                        // If we have null values
    					if (arrToNextStop == null) {
    						arrToNextStop = schToNextStop;
    						delayNextStop = 0;
    					}

                        arrStop += arrToNextStop;
    					delay += delayNextStop;
                        stopDelayAvg += stopDelay;

    				}

    			}


    			delay = delay / allRotations.length;
                stopDelayAvg = stopDelayAvg / allRotations.length;
                arrStop = arrStop / allRotations.length;

                Y += arrStop;

                calculatedRotation.trips[i].stops[j].delayToNextStop = delay;
                calculatedRotation.trips[i].stops[j].arrivalToNextStop = arrStop;
                calculatedRotation.trips[i].stops[j].stopDelay = stopDelayAvg;



    		}

            if (i != tripLen-1) {

                calculatedRotation.trips[i].stops[stops.length-1].y = allRotations[k].rotations[pos].trips[i].pause;

            }


    	}

		res.json(calculatedRotation);
	}
};




// jshint freeze:false

Date.prototype.addDays = function(days) {
    var dat = new Date(this.valueOf());
    dat.setDate(dat.getDate() + days);
    return dat;
};

/**
 * [getDates description]
 * @param  {[type]} startDate [description]
 * @param  {[type]} stopDate  [description]
 * @return {[type]}           [description]
 */
function getDatesBetween(startDate, stopDate) {
	var dateArray = [];
	var currentDate = startDate;

    while (currentDate <= stopDate) {
    	dateArray.push(currentDate.toISOString().substring(0, 10));
    	currentDate = currentDate.addDays(1);
	}
	return dateArray;
}