var BuoyAnalysisData = {
    mapW: 500,

    mapH: 600,

    mapJson: {},

    stationJson: {},

    property: 'wt',

    years: {
        start: 1982,
        end: 2015
    },

    /**
     *
     */
    populateMapData: function() {
        return new Promise(function(resolve) {
            d3.json('data/map.json', function(error, json) {
                BuoyAnalysisData.mapJson = json;
                resolve();
            });
        });
    },

    /**
     *
     */
    populateSrcFile: function() {
        return new Promise(function(resolve) {
            d3.json('data/stations.json', function(error, json) {
                BuoyAnalysisData.stationJson = json;
                resolve();
            });
        });
    },

    /**
     *
     */
    calculateYearlyAverages: function(stations) {
        var sum, count, avg;
        var years = [];

        for (var year = BuoyAnalysisData.years.start; year <= BuoyAnalysisData.years.end; year++) {
            sum = 0;
            count = 0;

            stations.forEach(function(id) {
                data = BuoyAnalysisData.stationJson[id]['a' + year][BuoyAnalysisData.property];

                if (data === undefined || data.y === 0) {
                    return;
                }

                sum += data.y;
                count++;
            });

            years.push({ average: (sum / count) || 0, year: year });
        }

        return years;
    },

    /**
     *
     */
    calculateMonthlyAverages: function(stations) {
        var sum, count, data;
        var months = [];

        for (var year = BuoyAnalysisData.years.start; year <= BuoyAnalysisData.years.end; year++) {
            for (var month = 0; month < 12; month++) {
                sum = 0;
                count = 0;

                stations.forEach(function(id) {
                    data = BuoyAnalysisData.stationJson[id]['a' + year][BuoyAnalysisData.property];

                    if (data === undefined || data.m[month] === 0) {
                        return;
                    }

                    sum += data.m[month];
                    count++;
                });

                months.push({ average: (sum / count) || 0, month: month, year: year });
            }
        };

        return months;
    }
};