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import { Injectable } from '@angular/core';
import {
BehaviorSubject, from, Observable, of, Subject, Subscription
} from 'rxjs';
import {
concatMap, distinctUntilChanged, last, map, shareReplay, switchMap, tap
} from 'rxjs/operators';
import { CustomtextService, BookletConfig, TestMode } from '../../shared/shared.module';
import {
isLoadingFileLoaded,
isNavigationLeaveRestrictionValue,
LoadedFile,
LoadingProgress,
StateReportEntry,
LoadingQueueEntry,
TestControllerState,
TestData,
TestLogEntryKey,
TestStateKey,
UnitData,
UnitNavigationTarget,
UnitStateKey, MaxTimeLeaveValue, maxTimeLeaveValues
} from '../interfaces/test-controller.interfaces';
import { EnvironmentData, NavigationLeaveRestrictions, Testlet } from '../classes/test-controller.classes';
import { TestControllerService } from './test-controller.service';
import { BackendService } from './backend.service';
import { AppError } from '../../app.interfaces';
@Injectable({
providedIn: 'root'
})
export class TestLoaderService {
private loadStartTimeStamp = 0;
private unitContentLoadSubscription: Subscription | null = null;
private environment: EnvironmentData; // TODO (possible refactoring) outsource to a service or what
private lastUnitSequenceId = 0;
private unitContentLoadingQueue: LoadingQueueEntry[] = [];
private totalLoadingProgressParts: { [loadingId: string]: number } = {};
constructor(
public tcs: TestControllerService,
private bs: BackendService,
private cts: CustomtextService
) {
this.environment = new EnvironmentData();
}
async loadTest(): Promise<void> {
this.reset();
const ts = Date.now();
this.tcs.testStatus$.next(TestControllerState.LOADING);
const testData = await this.bs.getTestData(this.tcs.testId).toPromise();
Iif (!testData) {
return; // error is already thrown
}
this.tcs.workspaceId = testData.workspaceId;
this.tcs.testMode = new TestMode(testData.mode);
this.restoreRestrictions(testData.laststate);
this.tcs.rootTestlet = this.getBookletFromXml(testData.xml);
this.tcs.timerWarningPoints =
this.tcs.bookletConfig.unit_time_left_warnings
.split(',')
.map(x => parseInt(x, 10))
.filter(x => !Number.isNaN(x));
await this.loadUnits(testData);
this.prepareUnitContentLoadingQueueOrder(testData.laststate.CURRENT_UNIT_ID || '1');
this.tcs.rootTestlet.lockUnitsIfTimeLeftNull();
// eslint-disable-next-line consistent-return
return this.loadUnitContents(testData)
.then(() => {
console.log({ loaded: (Date.now() - ts) });
this.resumeTest(testData.laststate);
});
}
reset(): void {
this.unsubscribeTestSubscriptions();
// Reset TestMode to be Demo, before the correct one comes with getTestData
// TODO maybe it would be better to retrieve the testmode from the login
this.tcs.testMode = new TestMode();
this.tcs.resetDataStore();
this.tcs.totalLoadingProgress = 0;
this.totalLoadingProgressParts = {};
this.environment = new EnvironmentData();
this.loadStartTimeStamp = Date.now();
this.unitContentLoadingQueue = [];
}
private resumeTest(lastState: { [k in TestStateKey]?: string }): void {
Iif (!this.tcs.rootTestlet) {
throw new AppError({ description: '', label: 'Booklet not loaded yet.', type: 'script' });
}
const currentUnitId = lastState[TestStateKey.CURRENT_UNIT_ID];
this.tcs.resumeTargetUnitSequenceId = currentUnitId ?
this.tcs.rootTestlet.getSequenceIdByUnitAlias(currentUnitId) :
1;
Iif (
(lastState[TestStateKey.CONTROLLER] === TestControllerState.TERMINATED_PAUSED) ||
(lastState[TestStateKey.CONTROLLER] === TestControllerState.PAUSED)
) {
this.tcs.testStatus$.next(TestControllerState.PAUSED);
this.tcs.setUnitNavigationRequest(UnitNavigationTarget.PAUSE);
return;
}
this.tcs.testStatus$.next(TestControllerState.RUNNING);
this.tcs.setUnitNavigationRequest(this.tcs.resumeTargetUnitSequenceId.toString());
}
private restoreRestrictions(lastState: { [k in TestStateKey]?: string }): void {
Iif (lastState[TestStateKey.TESTLETS_TIMELEFT]) {
this.tcs.maxTimeTimers = JSON.parse(lastState[TestStateKey.TESTLETS_TIMELEFT]);
}
Iif (lastState[TestStateKey.TESTLETS_CLEARED_CODE]) {
this.tcs.clearCodeTestlets = JSON.parse(lastState[TestStateKey.TESTLETS_CLEARED_CODE]);
}
}
private loadUnits(testData: TestData): Promise<number | undefined> {
const sequence = [];
for (let i = 1; i < this.lastUnitSequenceId; i++) {
this.totalLoadingProgressParts[`unit-${i}`] = 0;
this.totalLoadingProgressParts[`player-${i}`] = 0;
this.totalLoadingProgressParts[`content-${i}`] = 0;
sequence.push(i);
}
return from(sequence)
.pipe(
concatMap((sequenceId: number) => this.loadUnit(sequenceId, testData))
)
.toPromise();
}
private loadUnit(sequenceId: number, testData: TestData): Observable<number> {
const unitDef = this.tcs.getUnitWithContext(sequenceId).unitDef;
const resources = testData.resources[unitDef.id.toUpperCase()];
if (!resources) {
throw new Error(`No resources for unitId: \`${unitDef.id}\`.`);
}
Iif (!(resources.usesPlayer && resources.usesPlayer.length)) {
throw new Error(`Unit has no player: \`${unitDef.id}\`)`);
}
unitDef.playerFileName = resources.usesPlayer[0];
const definitionFile = (resources.isDefinedBy && resources.isDefinedBy.length) ? resources.isDefinedBy[0] : null;
Iif (testData.firstStart && definitionFile) {
// we don't need to call `[GET] /test/{testID}/unit` when this is the first test and no inline definition
this.incrementTotalProgress({ progress: 100 }, `unit-${sequenceId}`);
this.unitContentLoadingQueue.push({ sequenceId, definitionFile });
return this.getPlayer(testData, sequenceId, unitDef.playerFileName);
}
return this.bs.getUnitData(this.tcs.testId, unitDef.id, unitDef.alias)
.pipe(
switchMap((unit: UnitData) => {
Iif (!unit) {
throw new Error(`Unit is empty ${this.tcs.testId}/${unitDef.id}.`);
}
this.incrementTotalProgress({ progress: 100 }, `unit-${sequenceId}`);
this.tcs.setUnitPresentationProgress(sequenceId, unit.state[UnitStateKey.PRESENTATION_PROGRESS]);
this.tcs.setUnitResponseProgress(sequenceId, unit.state[UnitStateKey.RESPONSE_PROGRESS]);
this.tcs.setUnitStateCurrentPage(sequenceId, unit.state[UnitStateKey.CURRENT_PAGE_ID]);
this.tcs.setUnitStateDataParts(sequenceId, unit.dataParts);
this.tcs.setUnitResponseType(sequenceId, unit.unitResponseType);
if (definitionFile) {
this.unitContentLoadingQueue.push({ sequenceId, definitionFile });
} else {
// inline unit definition
this.tcs.setUnitPlayerFilename(sequenceId, unitDef.playerFileName);
this.tcs.setUnitDefinition(sequenceId, unit.definition);
this.tcs.setUnitLoadProgress$(sequenceId, of({ progress: 100 }));
this.incrementTotalProgress({ progress: 100 }, `content-${sequenceId}`);
}
return this.getPlayer(testData, sequenceId, unitDef.playerFileName);
})
);
}
private getPlayer(testData: TestData, sequenceId: number, playerFileName: string) {
if (this.tcs.hasPlayer(playerFileName)) {
this.incrementTotalProgress({ progress: 100 }, `player-${sequenceId}`);
return of(sequenceId);
}
return this.bs.getResource(testData.workspaceId, playerFileName)
.pipe(
tap((progress: LoadedFile | LoadingProgress) => {
this.incrementTotalProgress(
isLoadingFileLoaded(progress) ? { progress: 100 } : progress,
`player-${sequenceId}`
);
}),
last(),
map((player: LoadedFile | LoadingProgress) => {
Iif (!isLoadingFileLoaded(player)) {
throw new Error('File Loading Error');
}
this.tcs.addPlayer(playerFileName, player.content);
return sequenceId;
})
);
}
private prepareUnitContentLoadingQueueOrder(currentUnitId: string = '1'): void {
Iif (!this.tcs.rootTestlet) {
throw new AppError({
description: '', label: 'Testheft noch nicht verfügbar', type: 'script'
});
}
const currentUnitSequenceId = this.tcs.rootTestlet.getSequenceIdByUnitAlias(currentUnitId);
const queue = this.unitContentLoadingQueue;
let firstToLoadQueuePosition;
for (firstToLoadQueuePosition = 0; firstToLoadQueuePosition < queue.length; firstToLoadQueuePosition++) {
if (Number(queue[firstToLoadQueuePosition % queue.length].sequenceId) >= currentUnitSequenceId) {
break;
}
}
const offset = ((firstToLoadQueuePosition % queue.length) + queue.length) % queue.length;
this.unitContentLoadingQueue = queue.slice(offset).concat(queue.slice(0, offset));
}
private loadUnitContents(testData: TestData): Promise<void> {
// we don't load files in parallel since it made problems, when a whole class tried it at once
const unitContentLoadingProgresses$: { [unitSequenceID: number] : Subject<LoadingProgress> } = {};
this.unitContentLoadingQueue
.forEach(unitToLoad => {
unitContentLoadingProgresses$[Number(unitToLoad.sequenceId)] =
new BehaviorSubject<LoadingProgress>({ progress: 'PENDING' });
this.tcs.setUnitLoadProgress$(
Number(unitToLoad.sequenceId),
unitContentLoadingProgresses$[Number(unitToLoad.sequenceId)].asObservable()
);
});
return new Promise<void>(resolve => {
if (this.tcs.bookletConfig.loading_mode === 'LAZY') {
resolve();
}
this.unitContentLoadSubscription = from(this.unitContentLoadingQueue)
.pipe(
concatMap(queueEntry => {
const unitContentLoading$ =
this.bs.getResource(testData.workspaceId, queueEntry.definitionFile)
.pipe(shareReplay());
unitContentLoading$
.pipe(
map(loadingFile => {
if (!isLoadingFileLoaded(loadingFile)) {
return loadingFile;
}
this.tcs.setUnitDefinition(queueEntry.sequenceId, loadingFile.content);
return { progress: 100 };
}),
distinctUntilChanged((v1, v2) => v1.progress === v2.progress),
tap(progress => this.incrementTotalProgress(progress, `content-${queueEntry.sequenceId}`))
)
.subscribe(unitContentLoadingProgresses$[queueEntry.sequenceId]);
return unitContentLoading$;
})
)
.subscribe({
complete: () => {
if (this.tcs.testMode.saveResponses) {
this.environment.loadTime = Date.now() - this.loadStartTimeStamp;
this.bs.addTestLog(this.tcs.testId, [<StateReportEntry>{
key: TestLogEntryKey.LOADCOMPLETE, timeStamp: Date.now(), content: JSON.stringify(this.environment)
}]);
}
this.tcs.totalLoadingProgress = 100;
if (this.tcs.bookletConfig.loading_mode === 'EAGER') {
resolve();
}
}
});
});
}
private unsubscribeTestSubscriptions(): void {
Iif (this.unitContentLoadSubscription !== null) {
this.unitContentLoadSubscription.unsubscribe();
this.unitContentLoadSubscription = null;
}
}
private static getChildElements(element: Element): Element[] {
return Array.prototype.slice.call(element.childNodes)
.filter(e => e.nodeType === 1);
}
private incrementTotalProgress(progress: LoadingProgress, file: string): void {
Iif (typeof progress.progress !== 'number') {
return;
}
this.totalLoadingProgressParts[file] = progress.progress;
const sumOfProgresses = Object.values(this.totalLoadingProgressParts).reduce((i, a) => i + a, 0);
const maxProgresses = Object.values(this.totalLoadingProgressParts).length * 100;
this.tcs.totalLoadingProgress = (sumOfProgresses / maxProgresses) * 100;
}
private getBookletFromXml(xmlString: string): Testlet {
const oParser = new DOMParser();
const xmlStringWithOutBom = xmlString.replace(/^\uFEFF/gm, '');
const oDOM = oParser.parseFromString(xmlStringWithOutBom, 'text/xml');
if (oDOM.documentElement.nodeName !== 'Booklet') {
throw Error('Root element fo Booklet should be <Booklet>');
}
const metadataElements = oDOM.documentElement.getElementsByTagName('Metadata');
Iif (metadataElements.length === 0) {
throw Error('<Metadata>-Element missing');
}
const metadataElement = metadataElements[0];
const IdElement = metadataElement.getElementsByTagName('Id')[0];
const LabelElement = metadataElement.getElementsByTagName('Label')[0];
const rootTestlet = new Testlet(0, IdElement.textContent || '', LabelElement.textContent || '');
const unitsElements = oDOM.documentElement.getElementsByTagName('Units');
if (unitsElements.length > 0) {
const customTextsElements = oDOM.documentElement.getElementsByTagName('CustomTexts');
Iif (customTextsElements.length > 0) {
const customTexts = TestLoaderService.getChildElements(customTextsElements[0]);
const customTextsForBooklet: { [key: string] : string } = {};
for (let childIndex = 0; childIndex < customTexts.length; childIndex++) {
Iif (customTexts[childIndex].nodeName === 'CustomText') {
const customTextKey = customTexts[childIndex].getAttribute('key');
Iif (customTextKey) {
customTextsForBooklet[customTextKey] = customTexts[childIndex].textContent || '';
}
}
}
this.cts.addCustomTexts(customTextsForBooklet);
}
const bookletConfigElements = oDOM.documentElement.getElementsByTagName('BookletConfig');
this.tcs.bookletConfig = new BookletConfig();
if (bookletConfigElements.length > 0) {
this.tcs.bookletConfig.setFromXml(bookletConfigElements[0]);
}
// recursive call through all testlets
this.lastUnitSequenceId = 1;
this.tcs.allUnitIds = [];
this.addTestletContentFromBookletXml(
rootTestlet,
unitsElements[0],
new NavigationLeaveRestrictions(
this.tcs.bookletConfig.force_presentation_complete,
this.tcs.bookletConfig.force_response_complete
)
);
}
return rootTestlet;
}
private addTestletContentFromBookletXml(
targetTestlet: Testlet,
node: Element,
navigationLeaveRestrictions: NavigationLeaveRestrictions
) {
const childElements = TestLoaderService.getChildElements(node);
if (childElements.length > 0) {
let codeToEnter = '';
let codePrompt = '';
let maxTime = -1;
let maxTimeLeave: MaxTimeLeaveValue = 'confirm';
let forcePresentationComplete = navigationLeaveRestrictions.presentationComplete;
let forceResponseComplete = navigationLeaveRestrictions.responseComplete;
let restrictionElement: Element | null = null;
for (let childIndex = 0; childIndex < childElements.length; childIndex++) {
if (childElements[childIndex].nodeName === 'Restrictions') {
restrictionElement = childElements[childIndex];
break;
}
}
if (restrictionElement !== null) {
const restrictionElements = TestLoaderService.getChildElements(restrictionElement);
for (let childIndex = 0; childIndex < restrictionElements.length; childIndex++) {
if (restrictionElements[childIndex].nodeName === 'CodeToEnter') {
const restrictionParameter = restrictionElements[childIndex].getAttribute('code');
if ((typeof restrictionParameter !== 'undefined') && (restrictionParameter !== null)) {
codeToEnter = restrictionParameter.toUpperCase();
codePrompt = restrictionElements[childIndex].textContent || '';
}
}
if (restrictionElements[childIndex].nodeName === 'TimeMax') {
const restrictionParameter = restrictionElements[childIndex].getAttribute('minutes');
if ((typeof restrictionParameter !== 'undefined') && (restrictionParameter !== null)) {
maxTime = Number(restrictionParameter);
Iif (Number.isNaN(maxTime)) {
maxTime = -1;
}
}
const leaveParameter = restrictionElements[childIndex].getAttribute('leave');
Iif (leaveParameter && maxTimeLeaveValues.includes(leaveParameter)) {
maxTimeLeave = leaveParameter;
}
}
if (restrictionElements[childIndex].nodeName === 'DenyNavigationOnIncomplete') {
const presentationComplete = restrictionElements[childIndex].getAttribute('presentation');
if (presentationComplete && isNavigationLeaveRestrictionValue(presentationComplete)) {
forcePresentationComplete = presentationComplete;
}
const responseComplete = restrictionElements[childIndex].getAttribute('response');
if (responseComplete && isNavigationLeaveRestrictionValue(responseComplete)) {
forceResponseComplete = responseComplete;
}
}
}
}
if (codeToEnter.length > 0) {
targetTestlet.codeToEnter = codeToEnter;
targetTestlet.codePrompt = codePrompt;
}
targetTestlet.maxTimeLeft = maxTime;
targetTestlet.maxTimeLeave = maxTimeLeave;
if (this.tcs.maxTimeTimers) {
Iif (targetTestlet.id in this.tcs.maxTimeTimers) {
targetTestlet.maxTimeLeft = this.tcs.maxTimeTimers[targetTestlet.id];
}
}
const newNavigationLeaveRestrictions =
new NavigationLeaveRestrictions(forcePresentationComplete, forceResponseComplete);
for (let childIndex = 0; childIndex < childElements.length; childIndex++) {
if (childElements[childIndex].nodeName === 'Unit') {
const unitId = childElements[childIndex].getAttribute('id');
Iif (!unitId) {
throw new AppError({
description: '', label: `Unit-Id Fehlt in unit nr ${childIndex} von ${targetTestlet.id}`, type: 'xml'
});
}
let unitAlias = childElements[childIndex].getAttribute('alias');
if (!unitAlias) {
unitAlias = unitId;
}
let unitAliasClear = unitAlias;
let unitIdSuffix = 1;
while (this.tcs.allUnitIds.indexOf(unitAliasClear) > -1) {
unitAliasClear = `${unitAlias}-${unitIdSuffix.toString()}`;
unitIdSuffix += 1;
}
this.tcs.allUnitIds.push(unitAliasClear);
targetTestlet.addUnit(
this.lastUnitSequenceId,
unitId,
childElements[childIndex].getAttribute('label') ?? '',
unitAliasClear,
childElements[childIndex].getAttribute('labelshort') ?? '',
newNavigationLeaveRestrictions
);
this.lastUnitSequenceId += 1;
} else if (childElements[childIndex].nodeName === 'Testlet') {
const testletId = childElements[childIndex].getAttribute('id');
Iif (!testletId) {
throw new AppError({
description: '', label: `Testlet-Id fehlt in unit nr ${childIndex} von ${targetTestlet.id}`, type: 'xml'
});
}
const testletLabel: string = childElements[childIndex].getAttribute('label')?.trim() ?? '';
this.addTestletContentFromBookletXml(
targetTestlet.addTestlet(testletId, testletLabel),
childElements[childIndex],
newNavigationLeaveRestrictions
);
}
}
}
}
}
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