// define Client ID and scope
var getClasses = '';

var CLIENT_ID = '151965640542-15n7u270ijovdpt03c994i51ok98ts4j.apps.googleusercontent.com'; 
var API_KEY = 'AIzaSyDE1f3vZh0IH9mz-i5UC7QAQsT_hqY8sgA'; 

if(getClasses) {
    var SCOPES = [
        "https://www.googleapis.com/auth/classroom.courses.readonly",
        "https://www.googleapis.com/auth/classroom.rosters.readonly",
        "https://www.googleapis.com/auth/classroom.coursework.me",
        "https://www.googleapis.com/auth/classroom.coursework.me.readonly",
        "https://www.googleapis.com/auth/classroom.coursework.students",
        "https://www.googleapis.com/auth/classroom.coursework.students.readonly",
        "https://www.googleapis.com/auth/classroom.profile.photos",
        "https://www.googleapis.com/auth/classroom.profile.emails"
    ];
} else {
    var SCOPES = [
        "https://www.googleapis.com/auth/classroom.coursework.me",
        "https://www.googleapis.com/auth/classroom.coursework.me.readonly",
        "https://www.googleapis.com/auth/classroom.coursework.students",
        "https://www.googleapis.com/auth/classroom.coursework.students.readonly"
    ];
}


// Check if current user has authorized this application.
function checkAuth() {
    gapi.auth.authorize({
        'client_id': CLIENT_ID,
        'scope': SCOPES.join(' '),
        'immediate': true
    }, handleAuthResult);
}

// Handle response from authorization server.
// @param {Object} authResult Authorization result.
function handleAuthResult(authResult) {
    if (authResult && !authResult.error) {
        // Load Classroom API client library.
        log("handleAuthResult(): success - " + JSON.stringify(authResult));
        load();
    }
    else if (authResult['error'] == "immediate_failed") {
        log("handleAuthResult(): immediate_failed - " + JSON.stringify(authResult));
        // only if not denied first time, popup again.
        $.ajax({
            url: '/myclasses/api/getgcinfo',
            type: 'GET',
            success: function(data) {
                $.ajax({
                    url: '/myclasses/api/saveuserinfo',
                    type: 'POST',
                    data: {c: 'denied'}
                });

                $('.gc-notification').removeClass('hidden');
                if(data.status=='ok') {
                    requestAuth();
                }    
            }
        });
    } else if (authResult['error']) {
        log("handleAuthResult(): error - " + JSON.stringify(authResult));
        $('.gc-notification').removeClass('hidden');
    }
}

// Handle response from authorization server (For immediate_failed).
// @param {Object} authResult Authorization result.
function handleManualAuthResult(authResult) {
    if (authResult && !authResult.error) {
        // Load Classroom API client library.
        $('.gc-notification').addClass('hidden');
        load();
        log("handleManualAuthResult(): success - " + authResult.access_token);
    } else {
        log("handleManualAuthResult(): error - " + authResult.error);
        $('.gc-notification').removeClass('hidden');
    }
}


// Request current user to authorize access.
function requestAuth() {
    gapi.auth.authorize({
        client_id: CLIENT_ID, scope: SCOPES, immediate: false
    }, handleManualAuthResult);
    return false;
}

function load() {
    gapi.client.load('classroom', 'v1', authorized);
}

function authorized() {
    log("authorized() - classroom api loaded");
    if(getClasses) {
        listClasses();
    }
}

// List the names of the first 10 classes(courses) the user has access to. 
// If no classes are found, ignore.
function listClasses() {
        // pageSize: 10
    // no pageSize - server determines the size
    var request = gapi.client.classroom.courses.list({
    });

    request.execute(function(resp) {
        log("listClasses() - " + JSON.stringify(resp));
        var classes = resp.courses;

        var $elem = $('select.google_classroom_selector');
        if (classes && classes.length > 0) {
            $('#class_options').removeClass('hidden');
            $('#google_classroom').removeClass('hidden');
            $("form.custom").addClass('hidden');
            $("#classroom_info").addClass('hidden');
            classes = classes.filter(function(classitem) {
                return (classitem.courseState=='ACTIVE');
            }); 
            $.ajax({
                url: '/myclasses/api/saveuserinfo',
                type: 'POST',
                data: {state: 'enabled', type: 'google', data: classes},
                success: function(data) {
                    for (i = 0; i < classes.length; i++) {
                        var gClass = classes[i];
                        //console.log(gClass);
                        if(data.firsttime) {
                            $elem.append('<option value="'+gClass.id+'">'+gClass.name+'</option>');
                        }
                    }

                    if ($(".gc-list-assignment").attr("externalid")) {
                        listAssignments($(".gc-list-assignment").attr("externalid"));
                    }
                }
            });

        } else if ((resp.error && resp.error.message && resp.error.message.search('@ClassroomDisabled') ==0) ||
            (resp.error && resp.error.message && resp.error.message.search('@NotGoogleAppsUser') ==0) ||
            (classes && classes.length == 0)) {
            log("listClasses(): error - " + JSON.stringify(resp));
            $('#classroom_info').removeClass('hidden');
            $.ajax({
                url: '/myclasses/api/saveuserinfo',
                type: 'POST',
                data: {state: 'disabled', type: 'google'},
                success: function(data) {
                    $('.gc-notification').removeClass('hidden');
                }
            });
        }

    });
}

function addExternalClassroom() {
    var $elem = $('select.google_classroom_selector');
    var g_classid = $elem.val();
    var g_classname = $elem.find('option:selected').text();
    //console.log(g_classid);
    //console.log(g_classname);

    var request = gapi.client.classroom.courses.students.list({
        courseId: g_classid
    });

    request.execute(function(resp) {
        log("addExternalClassroom() - " + JSON.stringify(resp));
        var students = resp.students;

        var g_students = [];
        if (students && students.length > 0) {
            for (i = 0; i < students.length; i++) {
                var student = students[i];
                log("listClasses(): student - " + JSON.stringify(student));
                g_students[i]= {
                    externalid: student.userId,
                    username: student.profile.emailAddress,
                    fname: student.profile.name.givenName,
                    lname: student.profile.name.familyName,
                    img: student.profile.photoUrl
                }
            } 
        } 

        // create a classroom 
        $.ajax({
            url : '/myclasses/api/createExternalClass',
            type: 'POST',
            data : {
               externalid: g_classid,
               classname: g_classname,
               students: JSON.stringify(g_students)
            },
            success : function(data) {
                log("createExternalClass() - " + JSON.stringify(data));
                if(data && data.status == 'success') {
                    window.location = '/myclasses';
                }
            }
        });

    });
}

function syncClassRoster(classid, g_classid, nextPageToken="", g_students=null) {
    //console.log("SYNC");
    //console.log(g_classid);
    //console.log(classid);

    if(nextPageToken) {
        var request = gapi.client.classroom.courses.students.list({
            courseId: g_classid,
            pageToken: nextPageToken
        });
    } else {
        var request = gapi.client.classroom.courses.students.list({
            courseId: g_classid
        });
        var g_students = [];
    }

      
    request.execute(function(resp) {
        log("syncClassRoster() - " + JSON.stringify(resp));
        var students = resp.students;
        nextPageToken = resp.nextPageToken;

        if (students && students.length > 0) {
            for (var i = 0; i < students.length; i++) {
                var student = students[i];
                log("syncClassRoster() - " + JSON.stringify(student));
                var obj = {
                    externalid: student.userId,
                    username: student.profile.emailAddress,
                    fname: student.profile.name.givenName,
                    lname: student.profile.name.familyName,
                    img: student.profile.photoUrl
                };
                g_students.push(obj);
            } 
        } 

        // more?
        if(nextPageToken) {
            // get more
            syncClassRoster(classid, g_classid, nextPageToken, g_students);

        } else {
            // all done, sync class roster 
            $.ajax({
                url : '/myclasses/api/syncClassRoster',
                type: 'POST',
                data : {
                   id: classid,
                   externalid: g_classid,
                   students: JSON.stringify(g_students)
                },
                success : function(data) {
                    log("syncClassRoster() - " + JSON.stringify(data));
                    if(data && data.status == 'success') {
                        window.location = '/myclasses/class?id='+classid;
                    }
                }
            });
        }

    });
}


function listAssignments(g_classid) {
    var request = gapi.client.classroom.courses.courseWork.list({
        courseId: g_classid
    });

    request.execute(function(resp) {
        log("listAssignments() - " + JSON.stringify(resp));
        var coursework = resp.courseWork;

        if (coursework && coursework.length > 0) {
            for (i = 0; i < coursework.length; i++) {
                var cw = coursework[i];
                log("listAssignments() - #" + (i+1) + " - " + JSON.stringify(cw));
            } 
        } 
    }); 
} 

function postAssignment(classId, chapterId, lessonId, g_classId, lessonNumber, lessonTitle, lessonDescription, reload) {

    if (chapterId) {
        var next = 'https://'+window.location.hostname+'/lesson/class?classid='+classId+'&chapterid='+chapterId;
        var url1 = 'https://'+window.location.hostname+'/auth/externallogin?next='+encodeURIComponent(next);
        var url2 = 'https://'+window.location.hostname+'/auth/googlelogin?next='+encodeURIComponent(url1);
        var url3 = 'https://'+window.location.hostname+'/school/assignment?classid='+classId+'&chapterid='+chapterId+'&next='+encodeURIComponent(url2);
    }  else {
        var next = 'https://'+window.location.hostname+'/lesson/class?classid='+classId+'&lessonid='+lessonId;
        var url1 = 'https://'+window.location.hostname+'/auth/externallogin?next='+encodeURIComponent(next);
        var url2 = 'https://'+window.location.hostname+'/auth/googlelogin?next='+encodeURIComponent(url1);
        var url3 = 'https://'+window.location.hostname+'/school/assignment?classid='+classId+'&lessonid='+lessonId+'&next='+encodeURIComponent(url2);

    }
    // post assignment to classroom using gapi
    var info=[ {
        link: {
            url: url3
        }
    } ];

    var title = 'Lesson ' + lessonNumber + ': ' + lessonTitle;

    var request = gapi.client.classroom.courses.courseWork.create({
        courseId: g_classId,
        title: title,
        description: lessonDescription,
        materials: info,
        state: "PUBLISHED",
        submissionModificationMode : "MODIFIABLE_UNTIL_TURNED_IN",
        workType : "ASSIGNMENT"
    });

    var done=false;
    request.execute(function(resp) {
        log("postAssignment() - " + JSON.stringify(resp));
        $.ajax({
            url: '/myclasses/api/saveassignmentdata',
            type: 'POST',
            data: {
                classid: classId,
                lessonid: lessonId,
                assignmentid: resp.id
            },
            success: function(data) {
               if(reload) {
                   location.reload();
               }
            }
        });
    }); 

} 

function turnInAssignment(classid, g_classId, g_assignmentId, g_studentId, g_lessonId) {
    // get the list of submission for the assignment
    var request = gapi.client.classroom.courses.courseWork.studentSubmissions.list({
        courseId: g_classId,
        courseWorkId: g_assignmentId,
        userId: g_studentId
    });

    request.execute(function(resp) {
        log("turnInAssignment(): list - " + JSON.stringify(resp));
        // use the first assignment submission id to turn in assignment
        if(resp.studentSubmissions) {
            g_submissionId = resp.studentSubmissions[0].id;
            var request = gapi.client.classroom.courses.courseWork.studentSubmissions.turnIn({
                courseId: g_classId,
                courseWorkId: g_assignmentId,
                id: g_submissionId
            });
            request.execute(function(resp) {
                log("turnInAssignment(): turnIn - " + JSON.stringify(resp));
                // save turned in data to class student info
                $.ajax({
                    url: '/myclasses/api/saveturnin',
                    type: 'POST',
                    data: {
                        id: classid,
                        classid: g_classId,
                        lessonid: g_lessonId,
                        studentid: g_studentId,
                        submissionid: g_submissionId
                    },
                    success : function(data) {
                        log("saveturnin() - " + JSON.stringify(data));
                        if(data && data.status == 'success') {
                            window.location = '/myclasses/toc?classid='+classid;
                        }
                    }
                });
            });
        }
    }); 
} 


function log(msg) {
    console.log(msg);
    // @tsilva HACK: jquery may not be loaded yet
    if($ === undefined) { return; }
    $.ajax({
        url: '/myclasses/api/logMessage',
        type: 'POST',
        data: {
            message: msg
        }
    }); 
}