(function () {

    "use strict";

    // "Private" members
    var dataPath = "data/";
    var dataPathP = "data";
    var dataPathG ="data"
    var clientDataPath = "clientData/";
    var version = "";
    var electionType;
    var trimJsonRoot = function (json) { return json.Root === undefined ? json : json.Root; }
    var buildFullFilePath = function (fileName, isVersioned, isClientData) {
        //getDataPath();        
        var dataPathToUse = isClientData ? clientDataPath : dataPath;
        return dataPathToUse + fileName + (isVersioned ? ("_" + version) : "") + ".json";
    }

    var getDataPath = function () {
        switch (electionType) {
            case "G":
                dataPath = dataPathG;
                break;
            default:
                dataPath = dataPathP;
                break;
        }
    }

    angular.module("jsonDataFetcherModule", [])
           .factory("jsonDataFetcher", ["$http", "$q", "errorHandler", "primaryService", function ($http, $q, errorHandler, primaryService) {
               return {

                   // Fetch a single json file.
                   fetchSingleJson: function (fileName, isVersioned, isClientData, fetchSuccessfulCallback) {
                       var fullFilePath = buildFullFilePath(fileName, isVersioned, isClientData);
                       var fetchSuccessful = false;

                       $http.get(fullFilePath)
                            .success(function (json) {
                                var returnJson = trimJsonRoot(json);

                                fetchSuccessful = true;
                                fetchSuccessfulCallback(returnJson);
                            })
                            .error(function (data, status) {

                                // Handle Json retrieval errors
                                if (!fetchSuccessful) {
                                    var msgString;
                                    var isCorruptJson = data === undefined && status === undefined;
                                    if (isCorruptJson)
                                        msgString = "\"" + fileName + "\" data is corrupt.";
                                    else
                                        msgString = "Failed to retrieve \"" + fileName + "\" data due to " + status + " error.";
                                    errorHandler.handleError(msgString);
                                }
                            });
                   },

                   // Fetch multiple json files simultaneously. Will only execute provided callback once all files are retrieved. 
                   fetchMultipleJson: function (fileNames, areVersioned, areClientData, fetchSuccessfulCallback) {
                       var fetchSuccessful = false;

                       // Begin simutaneous retrieval
                       var promiseArray = [];
                       for (var i = 0; i < fileNames.length; i++) {
                           var fullFilePath = buildFullFilePath(fileNames[i], areVersioned[i], areClientData[i]);
                           promiseArray.push($http.get(fullFilePath));
                       }

                       // Process all fetches as a single promise.
                       $q.all(promiseArray)
                         .then(function (jsonArray) {
                             for (var j = 0; j < fileNames.length; j++)
                                 jsonArray[j] = (trimJsonRoot(jsonArray[j].data));

                             fetchSuccessful = true;
                             fetchSuccessfulCallback(jsonArray);
                         })
                         .catch(function (rejection) {

                             // Handle Json retrieval errors
                             if (!fetchSuccessful) {
                                 var msgString;
                                 var isCorruptJson = rejection.config === undefined && rejection.status === undefined;
                                 if (isCorruptJson)
                                     msgString = "\"" + fileNames + "\" data is corrupt.";
                                 else
                                     msgString = "Failed to retrieve \"" + fileNames + "\" data due to " + rejection.status + " error.";
                                 errorHandler.handleError(msgString);
                             }
                         });
                   },

                   // Tell jsonDataFetcher what version to use so it can automatically include it in JSON requests.
                   registerVersion: function (curVersion) {
                       version = curVersion;
                   },
                   // Tell jsonDataFetcher what version to use so it can automatically include it in JSON requests.
                   registerElectionType: function (_electionType) {
                       electionType = _electionType;
                   }
               };
           }]);
}());