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Question.ts
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Question.ts
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import { IQuestion, IPrompt } from "types/generated/contentful";
import { Difficulty, Mode } from "./constants";
import Choice from "./Choice";
import { Validation } from "types/validation";
class Question {
static isSelectionCorrect(
question: IQuestion,
mode: Mode,
difficulty: Difficulty,
stimulusId: string
): boolean {
const choice = Question.getChoice(question, difficulty);
return Choice.isSelectionCorrect(choice, mode, stimulusId);
}
static validate(question: IQuestion): Validation {
const counts = { easy: 0, medium: 0, hard: 0 };
const difficulties = question.fields.choices.map(
(c) => c.fields.difficulty
);
difficulties.forEach((d) => {
counts[d]++;
});
const problems = Object.entries(counts)
.filter(([_, count]) => count > 1)
.map(
([d, count]) =>
`There should be at most one "${d}" Choice, but instead there are ${count}`
);
return { status: problems.length > 0 ? "error" : "ok", problems };
}
/**
* Note: In "assessment" books, the difficulty will not be relevant - there should only be one Choice per Question.
*/
static getChoice(question: IQuestion, difficulty: Difficulty) {
const validation = Question.validate(question);
if (validation.status === "error") {
throw new InvalidQuestionError(question, validation.problems);
}
const choice = question.fields.choices.find(
(c) => c.fields.difficulty === difficulty
);
if (!choice) {
throw new InvalidQuestionError(question);
}
return choice;
}
static getPromptText(question: IQuestion, mode: Mode): string {
const prompt = Question.getPrompt(question, mode);
return prompt.fields.text;
}
static getPrompt(question: IQuestion, mode: Mode): IPrompt {
const prompt =
mode === "number"
? question.fields.numberPrompt
: question.fields.sizePrompt;
if (!prompt) {
throw new Error(
`Missing prompt for mode ${mode} for question ${question.sys.id}`
);
}
return prompt;
}
static getAudio(question: IQuestion, mode: Mode): string[] {
const audio = [];
const narrativeAudio =
question.fields.narrative?.fields.audio?.fields.file.url;
if (narrativeAudio) {
audio.push(narrativeAudio);
}
const prompt = Question.getPrompt(question, mode);
const promptAudio = prompt.fields.audio?.fields.file.url;
if (promptAudio) {
audio.push(promptAudio);
}
return audio;
}
}
export default Question;
class InvalidQuestionError extends Error {
questionId: string;
problems: Array<string>;
constructor(question: IQuestion, problems: Array<string> = []) {
super("Invalid Question Error");
this.questionId = question.sys.id;
this.problems = problems;
}
}