(function() {
    "use strict";

    angular.module("raz")
        .service("autoAssignedGoalSets", ["autoAssignedGoalSetsApi", "$q", "studentList", "_",
            function (autoAssignedGoalSetsApi, $q, studentList, _) {

                var autoAssignedStudentsBySet = [];
                var students = [];

                function getAutoAssignedStudentsForGoalSet(categoryId) {
                    if (autoAssignedStudentsBySet[categoryId]) {
                        var deferred = $q.defer();
                        deferred.resolve(autoAssignedStudentsBySet[categoryId]);
                        return deferred.promise;
                    } else {
                        return studentList.get().$promise
                            .then(function(results) {
                                students = results;
                                return autoAssignedGoalSetsApi.getAutoAssignedStudentsForGoalSet(categoryId)
                                    .then(function(data) {
                                        autoAssignedStudentsBySet[categoryId] = populateStudentNames(data);
                                        return autoAssignedStudentsBySet[categoryId];
                                    })
                                    .catch(function(error) {
                                        console.log(error);
                                    })
                            })
                            .catch(function(error) {
                                console.log(error);
                            })
                    }
                }

                function populateStudentNames(goalSetStudents) {
                    var newStudents = [];
                    goalSetStudents.each(function(student) {
                        if (student.hasOwnProperty('student_id')) {
                            var studentName = getStudentName(student['student_id']);
                            if (studentName !== null) {
                                newStudents.push({student_id: student['student_id'], student_name: studentName});
                            }
                        }
                    })
                    return newStudents;
                }

                function getStudentName(student_id) {
                    var foundStudent = _.find(students, function (student) {
                        return student.student_id == student_id;
                    });
                    if (foundStudent == null) {
                        return null;
                    }
                    return foundStudent.student_name;
                }

                return {
                    getAutoAssignedStudentsForGoalSet: getAutoAssignedStudentsForGoalSet
                };

            }]);
})();