(function() {
    "use strict"

    angular
        .module("shared")
        .service('studentScienceAssignmentLevel', [function() {
            var service = this;
            service.determineStudentAssignmentLevel = determineStudentAssignmentLevel;

            var unitToRankMap = {
                1: 1,
                2: 2,
                3: 3
            };

            function determineStudentAssignmentLevel(unitStageId, studentScienceStageId, studentScienceLevel) {
                var studentScienceStageRank = unitToRankMap[studentScienceStageId];
                var unitStageRank = unitToRankMap[unitStageId];
                if(studentScienceStageRank == unitStageRank) {
                    //same stage, so return student level
                    return studentScienceLevel;
                }
                else if(studentScienceStageRank < unitStageRank) {
                    return "low";
                }
                else if(studentScienceStageRank > unitStageRank) {
                    return "high";
                }
            }
        }]);
})();