var graphs = graphs || {};

graphs.dataManager = function module() {
    var exports = {},
        dispatch = d3.dispatch('dataReady', 'dataLoading', 'dataError'),
        data;

    d3.rebind(exports, dispatch, 'on');

    exports.loadJsonData = function(_file, _cleaningFn) {
        var loadJson = d3.json(_file);

        loadJson.on('progress', function(){
            dispatch.dataLoading(d3.event.loaded);
        });

        loadJson.get(function (_err, _response){
            if (!_err){
                _response.data.forEach(function(d){
                    _cleaningFn(d);
                });
                data = _response.data;
                dispatch.dataReady(_response.data);
            } else {
                dispatch.dataError(_err.statusText);
            }
        });
    };

    exports.loadTsvData = function(_file, _cleaningFn) {
        var loadTsv = d3.tsv(_file);

        loadTsv.on('progress', function() {
            dispatch.dataLoading(d3.event.loaded);
        });

        loadTsv.get(function (_err, _response) {
            if (!_err){
                _response.forEach(function(d){
                    _cleaningFn(d);
                });
                data = _response;
                dispatch.dataReady(_response);
            } else {
                dispatch.dataError(_err.statusText);
            }
        });
    };

    exports.loadCsvData = function(_file, _cleaningFn) {
        var loadCsv = d3.csv(_file);

        loadCsv.on('progress', function() {
            dispatch.dataLoading(d3.event.loaded);
        });

        loadCsv.get(function (_err, _response) {
            if (!_err){
                _response.forEach(function(d){
                    _cleaningFn(d);
                });
                data = _response;
                dispatch.dataReady(_response);
            } else {
                dispatch.dataError(_err.statusText);
            }
        });
    };

    // If we need more types of data geoJSON, etc. we will need
    // to create methods for them

    exports.getCleanedData = function(){
        return data;
    };

    return exports;
};